CN101424553A - Ultrasonic flow measuring instrument - Google Patents
Ultrasonic flow measuring instrument Download PDFInfo
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- CN101424553A CN101424553A CNA2008101833360A CN200810183336A CN101424553A CN 101424553 A CN101424553 A CN 101424553A CN A2008101833360 A CNA2008101833360 A CN A2008101833360A CN 200810183336 A CN200810183336 A CN 200810183336A CN 101424553 A CN101424553 A CN 101424553A
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Abstract
An ultrasonic flow meter of the present invention includes: a measurement flow path 6 through which a fluid to be measured flows; ultrasonic transducers 8 and 9 provided respectively on an upstream side and a downstream side with respect to each other along the measurement flow path 6; an upstream aperture hole 11 and a downstream aperture hole 12, the aperture holes 11 and 12 for exposing the ultrasonic transducers 8 and 9 to the measurement flow path 6; a first influent suppressor 15 provided in a vicinity of at least the downstream aperture hole 12 for reducing inflow of the fluid to be measured into the aperture hole 12; a second influent suppressor 16 provided on an upstream side of the measurement flow path 6 with respect to the aperture holes 11 and 12 for reducing the inflow of the fluid to be measured into the aperture holes 11 and 12; a measurement control section 19 for measuring a propagation time of an ultrasonic wave between the ultrasonic transducers 8 and 9; and a calculation section 20 for calculating a flow rate based on a signal from the measurement control section 19. The first influent suppressor 15 provided for the downstream aperture hole 12 comprises an aperture hole sealing section 21 having at least one ultrasonically transmissive hole 22. Thus, it is possible to stabilize the flow between the ultrasonic transducers so as to enhance the ultrasonic reception level, thereby increasing the measurement precision and the upper limit value for the flow rate measurement, and to reduce the driving input for the ultrasonic transducers.
Description
The application is that application number is the dividing an application of Chinese patent application of 00805166.6 (international application no is PCT/JP00/01689), and the applying date of this Chinese patent application is on March 17th, 2000, and denomination of invention is " ultrasonic flow meter ".
Technical field
The present invention relates to a kind of ultrasonic flow meter, its adopt ultrasonic measurement gas or liquid flow and (or) flow velocity.
Background technology
This class ultrasonic flow meter has appearred in the prior art, and disclosed as the patent of Japanese patent application publication No. 11-351926.As Figure 44, a kind of ultrasonic flow meter comprises measuring tube 1, is used to allow fluid from an end flow direction other end, upstream ultrasonic transducer (upstream ultrasonictransducer) 2a and downstream (downstream ultrasonic transducer 2b.Upstream ultrasonic transducer 2a has the measuring tube 1 of predetermined angular relative with downstream ultrasonic transducer 2b through the center line that relative measurement pipe 1 is arranged therebetween.Upstream ultrasonic transducer 2a and downstream ultrasonic transducer 2b are loaded on the recess 3a and the 3b of measuring tube 1 respectively.Fluid fluctuation suppressing portion part 5 is at the inlet end 4 of measuring tube 1.The fluid that flows into measuring tube 1 is adjusted with degree of tilt that reduces measurement component and/or the generation that suppresses eddy current by fluid fluctuation suppressing portion part 5, therefore, therefore the variation of the ultrasound wave incoming level that minimizing causes because of the ultrasound wave at reflection and/or refraction rheology interface avoids the degeneration of measuring accuracy.
Another known example is that Japanese patent application publication No. is 63-26537 patent.As Figure 45, a pair of ultrasonic transducer 2a and 2b are oppositely disposed in the upstream extremity and the downstream end on the surface of measuring tube 1 respectively.Ultrasonic transducer 2a and 2b are loaded on the recess 3a and the 3b of measuring tube 1 respectively, at the place, hole of each recess 3a and 3b jumbo ultrasonic transmission parts 3c are arranged, and enter recess 3a and 3b to stop fluid, and high-precision flow measurement is provided.
Adopt as the described conventional structure of Figure 44, can be by adjusting the fluid of inflow measuring tube 1 with degree of tilt that reduces measurement component and/or the generation that suppresses eddy current at the inlet end 4 fluids fluctuation suppressing portion part 5 of measuring tube 1, therefore, the variation of the ultrasound wave incoming level that minimizing causes because of the ultrasound wave at reflection and/or refraction rheology interface reduces and measures distortion.Yet when the flow velocity in the measuring tube 1 increased, the fluid that flows into recess 3a and 3b produced eddy current, increases the interference to ultrasonic transducer 2a and 2b.Therefore, the ultrasound wave that reflection and/or refraction eddy current change the interface increases, thereby has reduced the ultrasound wave incoming level.Therefore, be difficult to reduce the driving input of ultrasonic transducer 2a and 2b.
Adopt as the described conventional structure of Figure 45, there is jumbo ultrasonic transmission parts 3c at the place, hole of each recess 3a and 3b, hyperacoustic propagation loss be may cause by jumbo ultrasonic transmission parts 3c, therefore, ultrasound wave output or ultrasound wave receiving sensitivity reduced.In addition, ultrasound wave has reduced linear characteristic wherein by jumbo this solid of ultrasonic transmission parts 3c, is difficult to the ultrasonic transducer emission ultrasound wave to the opposite.Therefore, be difficult to reduce the power consumption of flowmeter, therefore can not be used as the device that only just uses (for example 10 years) with very little electric weight for a long time, for example family expenses are measured the flowmeter of combustion gas (for example town gas or liquefied petroleum gas (LPG)) flow.
The invention solves the problems referred to above.The objective of the invention is to reduce the flow disturbance or the vortex that between ultrasonic transducer, produce, to strengthen the ultrasound wave incoming level, thereby improve measuring accuracy and to the higher limit of flow measurement, and reduce power consumption by the driving input that reduces ultrasonic transducer.
Summary of the invention
A kind of ultrasonic flow meter of the present invention comprises: measure flow channel, measured fluid is by wherein flowing; Ultrasonic transducer is separately positioned on along measuring flow channel upstream extremity respect to one another and downstream end; Upstream eyelet and downstream eyelet are used to make ultrasonic transducer to be exposed to the measurement flow channel; The first fluid rejector, contiguous at least downstream eyelet is used to reduce measured fluid and flows into this eyelet; The second fluid rejector is arranged on the upstream extremity of measurement flow channel and with respect to eyelet, is used to reduce measured fluid inflow eyelet; Measure control assembly, be used to measure the hyperacoustic travel-time between the ultrasonic transducer; And calculating unit, be used for calculated signals flow according to this measurement control assembly, wherein, for the first fluid rejector of downstream eyelet setting comprises the eyelet seal member with at least one ultrasonic transmission hole.Therefore, can stablize the fluid between the ultrasonic transducer, so that strengthen the ultrasound wave incoming level, thereby improve measuring accuracy and and to the higher limit of flow measurement, and by strengthening the ultrasound wave incoming level, and improve hyperacoustic decay by the fluid rejector is set, reduce driving input to ultrasonic transducer.
Another kind of ultrasonic flow meter of the present invention comprises: measure flow channel, measured fluid is by wherein flowing; Ultrasonic transducer is separately positioned on along measuring flow channel upstream extremity respect to one another and downstream end; Upstream eyelet and downstream eyelet are used to make ultrasonic transducer to be exposed to this measurement flow channel; The first fluid rejector and the second fluid rejector for the measured fluid of the reversed flow that flows forward, are used to reduce measured fluid and flow into eyelet; Measure control assembly, be used to measure the hyperacoustic travel-time between the ultrasonic transducer; And calculating unit, be used for calculated signals flow according to this measurements control assembly, wherein, for the first fluid rejector of the eyelet of downstream end setting when fluid flows forward is the eyelet seal member with at least one ultrasonic transmission hole; The second fluid rejector is set at inlet end and the endpiece of measuring flow channel.Therefore, even when fluid has fluctuation and produces instantaneous adverse current,, can reduce measured fluid and flow into eyelet as the situation when flowing forward, and reduce flow disturbance between the ultrasonic transducer significantly, thereby improve measuring accuracy and with to the higher limit of flow measurement.
Another kind of ultrasonic flow meter of the present invention comprises: measure flow channel, measured fluid is by wherein flowing; Ultrasonic transducer is separately positioned on along measuring flow channel upstream extremity respect to one another and downstream end; Be used to make each ultrasonic transducer to be exposed to the eyelet of measuring flow channel; The propagation ducts flow conditioner is provided with along the ultrasonic propagation passage between upstream ultrasonic transducer and the downstream ultrasonic transducer, and has the adjusting parts that are exposed to fluid; Measure control assembly, be used to measure the hyperacoustic travel-time between the ultrasonic transducer; Calculating unit is used for the calculated signals flow according to this measurement control assembly.Therefore, the adjusting parts of propagation ducts flow conditioner that are set directly at the upstream extremity of ultrasonic propagation passage have promoted at the flow disturbance from the upstream extremity of ultrasonic propagation passage to the whole zone that downstream end is passed through.Therefore, in the ultrasonic propagation passage, in the whole zone that the ultrasonic propagation passage of broad ways is passed through, near the zone of upstream eyelet near the downstream eyelet, no matter the size of flow, the whole zone of the whole Width of ultrasonic propagation passage, therefore the fluid situation, can be reduced the variation in the correction factor of whole flow measurement range by balancedly disturbance, avoid the error that causes because of correction factor, and improve measuring accuracy.Therefore, even when the mobile viscosity variation of fluid causes Reynolds number to change, measuring accuracy also is stable, and the measurement mechanism of being realized can bear the variation of fluid temperature (F.T.) or the variation of fluid composition, thereby has improved the practicality of this device.
Another kind of ultrasonic flow meter of the present invention comprises: measure flow channel, measured fluid is by wherein flowing; Ultrasonic transducer is separately positioned on along measuring flow channel upstream extremity respect to one another and downstream end; Be used to make each ultrasonic transducer to be exposed to the eyelet of this measurement flow channel; The propagation ducts flow conditioner is provided with along the ultrasonic propagation passage between upstream ultrasonic transducer and the downstream ultrasonic transducer, has the adjusting parts that are exposed to fluid; The fluid rejector is used to reduce measured fluid and flows into eyelet; Measure control assembly, be used to measure the hyperacoustic travel-time between the ultrasonic transducer; And calculating unit, be used for calculated signals flow according to this measurement control assembly.Therefore, the adjusting parts of propagation ducts flow conditioner that are set directly at the upstream extremity of ultrasonic propagation passage have promoted at the flow disturbance from the upstream extremity of ultrasonic propagation passage to the whole zone that downstream end is passed through.Therefore, in the ultrasonic propagation passage, in the whole zone that the ultrasonic propagation passage of broad ways is passed through, near the zone of upstream eyelet near the downstream eyelet, no matter the size of flow, the whole zone of the whole Width of ultrasonic propagation passage, therefore the fluid situation, can be reduced the variation in the correction factor of whole flow measurement range by balancedly disturbance, avoid the error that causes because of correction factor, and improve measuring accuracy.In addition, can the fluid rejector be set for opening feeds the eyelet of measuring flow channel, with the fluid in the minimizing inflow eyelet, thereby reduce significantly, and raising is for the higher limit of flow measurement along the flow disturbance of the ultrasonic propagation passage between the ultrasonic transducer.
In one embodiment, the first fluid rejector for upstream eyelet setting is an air deflector.Therefore, can reduce by propagation loss, thereby reduce driving input, and reduce the fluid that flows into the upstream eyelet ultrasonic transducer for the ultrasound wave of the ultrasound wave transfer port of upstream eyelet, therefore stable flow disturbance along the ultrasonic propagation passage, and improve measuring accuracy.
In one embodiment, the first fluid rejector for upstream eyelet setting is the eyelet seal member with at least one ultrasonic transmission hole.Therefore, can reduce the fluid that flows into upstream eyelet and downstream eyelet significantly, thereby improve for the higher limit of flow measurement and improve measuring accuracy, even to fluid with reversed flow.And, because the flow disturbance that causes of eyelet, can realize having the ultrasonic emitting/reception of the S/N characteristic of expectation by obvious minimizing.Therefore, can reduce sending output and driving input, thereby reduce power consumption.
In one embodiment, the aperture of the eyelet seal member that is provided with for the upstream eyelet is than greater than the aperture ratio for the eyelet seal member of downstream eyelet setting.Therefore, can reduce hyperacoustic propagation loss, thereby improve, reduce power consumption by the driving input that reduces ultrasonic transducer to the higher limit of flow measurement with to the measuring accuracy of counter fluid.
In one embodiment, the propagation ducts flow conditioner is set on the upstream extremity and downstream end with respect to the ultrasonic propagation passage.Therefore, the ultrasonic propagation passage by upstream and downstream propagation ducts flow conditioner around, therefore can make by the upstream extremity of ultrasonic propagation passage and the disturbance situation equilibrium of downstream end, thereby further stablize correction factor, improved measuring accuracy.In addition, reduced flow condition to influence by downstream propagation ducts flow conditioner along the downstream end of measuring flow channel.Therefore, no matter the pipe condition of the downstream end of measurement mechanism how, can realize stable measurement, thereby improved the installation degree of freedom of measurement mechanism.In addition, to obtaining effect same,, thereby improve measuring accuracy even also can stablize correction factor for the fluctuation fluid along positive flow and the reverse direction flow of measuring flow channel.
In one embodiment, be arranged on respect to the upstream extremity of ultrasonic propagation passage and the propagation ducts flow conditioner on the downstream end and combine by connector component.Therefore avoid and stablized ranging offset between the propagation ducts flow conditioner or upstream regulation parts and downstream and regulated offset between parts, therefore, reduced the variation of measurement mechanism.In addition, this link has been reinforced the propagation ducts flow conditioner, can reduce size or the thickness of regulating parts.Therefore, can make the flow condition in the ultrasonic propagation passage become even or reduce the pressure loss of measuring in the flow channel.
In one embodiment, be arranged on combined together with respect to the upstream extremity of ultrasonic propagation passage and the propagation ducts flow conditioner on the downstream end and fluid rejector.Therefore, can determine the position relation between upstream and downstream propagation ducts flow conditioner and the fluid rejector,, thereby stablize flow condition as distance.Therefore, can reduce the variation of the flow condition in the ultrasonic propagation passage, realize measurement stable and that variation is very little.By this combination, can also further increase the physical strength of propagation ducts flow conditioner, the distortion after preventing to use for a long time, thus improve its durability and reliability.
In one embodiment, the fluid rejector is the first fluid rejector that is provided with for the downstream eyelet.Therefore, the setting of this fluid rejector is that this is because the downstream eyelet extends with the acute angle direction of relative flow direction owing to enclose easy generation vortex near the eyes at this downstream aperture.Therefore, can reduce the fluid that flows into this eyelet,, increase higher limit flow measurement so that reduce the flow disturbance between ultrasonic transducer effectively.
In one embodiment, the fluid rejector is the first fluid rejector for upstream eyelet and the setting of downstream eyelet.Therefore, can effectively reduce the disturbance in the eyelet, this disturbance constitutes the major part of the total flow disturbance in the ultrasonic propagation passage, thereby increases measuring accuracy and to the higher limit of flow measurement.
In one embodiment, the fluid rejector is the second fluid rejector, and this second fluid rejector is by obtaining for the propagation ducts flow conditioner fluid along the setting of ultrasonic propagation passage suppresses parts.Therefore, by in conjunction with fluid rejector and propagation ducts flow conditioner, can reduce, thereby increase reliability and for providing miniature ultrasonic ripple propagation ducts to create conditions to the variation in the inhibition of the fluid of ostium eye.Therefore, can reduce to measure the size of flow channel.
In one embodiment, the fluid rejector is included as the first fluid rejector and the second fluid rejector that eyelet is provided with, and the second fluid rejector is by obtaining for propagation ducts flow conditioner fluid suppresses parts.Therefore, the disturbance in the eyelet is reduced by the multiplier effect of the first fluid rejector and the second fluid rejector, by in conjunction with fluid rejector and propagation ducts flow conditioner, can reduce to the variation in the inhibition of the fluid in the ostium eye.Therefore, measuring accuracy and reliability can have been increased.In addition, can provide small-sized ultrasonic propagation passage.Therefore, can reduce to measure the size of flow channel.
In one embodiment, the first fluid rejector is the eyelet seal member with at least one ultrasonic transmission hole.Therefore,, can further strengthen the inhibition effect that measured fluid is flowed into eyelet, therefore the fluid in minimizing and the stable eyelet by covering eyelet with the eyelet seal member.
In one embodiment, the first fluid rejector comprises the eyelet seal member with at least one ultrasonic transmission hole and is arranged near the air deflector of eyelet.Therefore, can further strengthen the effect that the fluid that suppresses measured flows into eyelet, therefore increase measuring accuracy.In addition, by air deflector is provided, for example can reduce foreign matter such as dust attached on the eyelet seal member.Therefore, the selection of eyelet seal member does not mainly need to consider too much the obstruction of eyelet seal member based on hyperacoustic transmission, thereby increases the degree of freedom of selecting.In addition, can strengthen the ultrasonic transmission ability,, or further increase sensitivity, realize having the measurement mechanism of expectation precision with the minimizing power consumption.
In one embodiment, the aperture of the eyelet seal member that is provided with for the upstream eyelet is than greater than the aperture ratio for the eyelet seal member of downstream eyelet setting.Therefore, can reduce hyperacoustic propagation loss, improve, reduce power consumption by the driving input that reduces ultrasonic transducer to the higher limit of flow measurement with to the measuring accuracy of reverse direction flow.
In one embodiment, the eyelet seal member is the cancellated mesh members that tilts, the inclination with relative horizontal direction.Therefore, this structure tilts with respect to horizontal direction, can promote the deposition attached to fine particles on the inclination mesh portion (for example dust) like this, thereby reduces the deposition and the obstruction that prevents this mesh members of this fine particle.Therefore, guarantee ultrasound wave therein transmission and keep long stable measuring accuracy, improve reliability and durability.
In one embodiment, air deflector is set at the upstream extremity and the downstream end of eyelet.Therefore,, all can further improve measuring accuracy, suppress to flow into the fluid of eyelet, prevent that foreign matter from entering eyelet for along positive flow and the reverse direction flow of measuring flow channel.Therefore, even, can keep long stable measuring accuracy, increase reliability and durability for fluctuation fluid with reverse direction flow.
In one embodiment, according to measured type of fluid, change propagation ducts flow conditioner and the interchannel distance of ultrasonic propagation.Therefore, can use the measurement flow channel at large, and, therefore, improve convenience, keep stable measuring accuracy no matter measured type of fluid only changes the propagation ducts flow conditioner, and irrelevant with detected fluid.Owing to can generally use the measurement flow channel, can reduce cost.
In one embodiment, the adjusting parts of propagation ducts flow conditioner are the structure of mesh members.Therefore, reduce the installing space of the relative flow direction of propagation ducts flow conditioner, therefore, reduced the size of measuring flow channel.
In one embodiment, the adjusting parts of propagation ducts flow conditioner are the structure of net member, and its wall streamwise extends.Therefore, can adjust flow direction by the wall that streamwise extends, the velocity flow profile in the further balanced ultrasonic propagation passage is improved measuring accuracy.
In one embodiment, according to along the cross section position of measuring flow channel, change the interval of two adjacent adjusting portion parts of propagation ducts flow conditioner.Therefore, can measure the size of each adjusting parts of cross section position optimization of flow channel according to the edge, and the length of the adjusting parts streamwise that maintenance simultaneously reduces.Therefore, velocity flow profile in can further balanced ultrasonic propagation passage and the length that reduces to regulate the parts streamwise, therefore, owing to, reduce the pressure loss and also improve measuring accuracy to the equilibrium of velocity flow profile.
In one embodiment, rectangle is contained perpendicular to the xsect of the direction of flow direction in measurement flow channel edge.By using the square-section, can increase survey area with respect to the overall measurement cross-sectional area, thereby for creating conditions in the fluid measurement under the kindred circumstances to downstream end from the upstream extremity of ultrasonic propagation passage.In addition, can increase the bidimensionality that flows, for the high-acruracy survey of the mean flow rate of realizing convection cell creates conditions along the ultrasonic propagation passage.In addition, by providing the second fluid rejector further to increase the bidimensionality that flows.
In one embodiment, measure flow channel and contain length breadth ratio less than 2 rectangle along xsect perpendicular to the direction of flow direction.Therefore, do not need to increase length breadth ratio and flow, the specification of xsect can freely be set according to the height of flow channel to produce two dimension, to reduce the interference of reflection wave, therefore, for the sensitivity that improves ultrasound wave transmission/reception creates conditions.In addition, measure the cross section, can reduce the pressure loss of measuring in the flow channel, therefore, be reduced along the length of measuring the xsect contacting with fluid, and needn't too smoothly measure xsect by adjusting.
In one embodiment, perforated openings feeds to be measured in the flow channel, and has along the shape on the limit that is substantially perpendicular to the direction extension of measuring flow direction in the flow channel.Therefore, but the short transverse of relative measurement flow channel is balancedly carried out hyperacoustic transmission/reception, and dwindles the aperture size of measuring the eyelet of streamwise in the flow channel.Therefore, can further reduce the flow disturbance that eyelet causes, further improve measuring accuracy.
In one embodiment, the introducing portion that is arranged on the upstream extremity of measuring flow channel is provided with the Non-Uniform Flow rejector, and it has narrow meshed access portal.Therefore, no matter the pipeline configuration upstream of the shape of flow channel or measurement flow channel how, can provide stable fluid to measuring flow channel, reduce the flow disturbance between ultrasonic transducer.Therefore, can further increase higher limit, further improve measuring accuracy flow measurement.In addition, no matter stably measured how, can be realized in the pipeline configuration upstream of the shape of flow channel or measurement flow channel, increase the installation degree of freedom of measurement mechanism.
In one embodiment, the introducing portion that is arranged on the upstream extremity of measuring flow channel all disposes the Non-Uniform Flow rejector with the export department that is arranged on the downstream end of measuring flow channel, and it has narrow meshed access portal.Therefore, can provide stable fluid to enter the measurement flow channel, even contain with the undulating flow of reverse direction flow or detected fluid when upstream extremity has fluctuation sources when detected fluid.Therefore, can reduce the fluid fluctuation between the ultrasonic transducer, further improve higher limit, and further improve measuring accuracy flow measurement.In addition, can realize stable measurement, and all have nothing to do, thereby further improve the degree of freedom of this measurement mechanism in installation with shape, pipeline configuration or the fluctuation sources of flow channel, the upstream or the downstream of measurement flow channel.
In one embodiment, the cross-sectional area of introducing portion or export department is greater than the cross-sectional area of measuring flow channel.Therefore, can increase the installation sectional area of Non-Uniform Flow rejector, reduce the pressure loss that the Non-Uniform Flow rejector causes, therefore, avoid the increase of the pressure loss.In addition, can increase the cross-sectional area of introducing portion or export department,,, need not change the shape of introducing portion or export department for the installation of this measurement mechanism creates conditions even when the change of shape of pipeline configuration on upstream extremity and downstream end or flow channel.Therefore, increase the installation degree of freedom of measurement mechanism.
In one embodiment, the Non-Uniform Flow rejector access portal aperture size less than the second fluid rejector the aperture size of access portal.Therefore, though in the upstream or the connectivity port, downstream be provided with offset the time, fluid can evenly flow measuring flow channel, therefore increases measuring accuracy.In addition, even when measured fluid has fluctuation, because the aperture of access portal can reduce to flow into the fluctuation of the fluid of measuring flow channel, therefore, even also can improve measuring accuracy for undulating flow.In addition and since the Non-Uniform Flow rejector the aperture size of access portal little, can reduce the amount of the dirt/dust that enters measurement component, increase along the reliability of the measuring operation of measuring flow channel.
In one embodiment, another kind of ultrasonic flow meter comprises: measure flow channel, measured fluid is by wherein flowing; Ultrasonic transducer is separately positioned on along measuring flow channel upstream extremity respect to one another and downstream end; Upstream eyelet and downstream eyelet are used to make each ultrasonic transducer to be exposed to this measurement flow channel; Wherein, at least one eyelet comprises a plurality of channel isolations that extend along the ultrasonic propagation direction.Therefore, because ultrasound wave is very little to the reduction of sensitivity by the propagation of the fluid in channel isolation.In addition, because the isolation of passage can keep hyperacoustic rectilinearity, realize desired reception and transmission.In addition, the orifice flow passage in the set eyelet in the side of the moving passage of longshore current is divided into fraction, so eddy current unlikely occurs, and can reduce the fluid that flows into eyelet.Therefore, even fluctuation takes place, but also correct measurement flow.
In one embodiment, at least one eyelet comprises a plurality of channel isolations that extend along the ultrasonic propagation direction.Therefore, by the fluid rejector, can reduce the fluid and the higher limit of improvement that flow into eyelet to measuring.In addition, because ultrasound wave is propagated by the fluid at channel isolation, the minimizing of sensitivity is very little.In addition, because the isolation of passage can keep hyperacoustic rectilinearity, realize its desired reception and transmission.In addition, the orifice flow passage in the set eyelet in the side of the moving passage of longshore current is divided into fraction, so eddy current unlikely occurs, and can further reduce the fluid that flows into eyelet.Therefore, even fluctuation takes place, but also correct measurement flow.
In one embodiment, each channel isolation is provided with inlet surface of extending along the vibration plane of ultrasonic transducer and the exit surface that extends along the wall of measuring flow channel.Therefore, because ultrasound wave can the right angle enter channel isolation and walk in a straight channel, ultrasonic propagation passage no reflection events, decay are very little.In addition, because outlet is a smooth surface with respect to the wall of flow channel, no disturbance in the flowing in the perisphere of the wall of the moving passage of longshore current.In addition, because exit surface is adjusted into radiating surface, effective radiate supersonic wave.
In one embodiment, each channel isolation of an eyelet extends with a corresponding channel isolation conllinear of another eyelet.Therefore, send surface and receiving surface and aim at mutually, can reduce because the reflection loss that the dividing plate in the channel isolation of relative eyelet causes along the ultrasonic propagation direction.
In one embodiment, one side being longer than of the longitudinal profile of each channel isolation is used to hyperacoustic half-wavelength of sending/receiving.Therefore, reduced the viscous influence of insulation surfaces, the channel isolation of little decay can be provided.
In one embodiment, one side the longitudinal profile of each channel isolation be not the integral multiple that is used to hyperacoustic half-wavelength of sending/receiving.Therefore, can suppress transverse resonance, realize having effect spread.
In one embodiment, the distance between the vibration plane of a ultrasonic transducer of the channel isolation of eyelet and correspondence is the integral multiple of hyperacoustic half-wavelength.Therefore, can provide resonance, thereby effective radiation is provided in half-wavelength.
In one embodiment, the thickness of each partitioned portion of channel isolation is less than the hyperacoustic wavelength that is used to send/receive.Therefore can avoid hyperacoustic reflection, effective ultrasonic wave transmission/reception is provided.
In one embodiment, channel isolation is to constitute by boxwork is installed in eyelet.Therefore.By using grid, can divide each eyelet at vertical and horizontal.
In one embodiment, a channel isolation in the channel isolation has opening at the middle part of eyelet.Therefore, eyelet is aimed at the middle part of ultrasonic transducer, and effective transmission/reception is provided.
In one embodiment, the passage length of each channel isolation is shorter than and is used to hyperacoustic wavelength of sending/receiving.Therefore, the ultrasonic propagation passage of very little decay can be provided.
In one embodiment, channel isolation is to constitute by along the direction perpendicular to the ultrasonic propagation direction mesh members is set in eyelet.Therefore, by eyelet being divided, can reduce passage length with mesh members.
In one embodiment, each channel isolation is included in certain communication means on a bit along its length, is used to make this channel isolation to be communicated with an adjacent channel isolation.Therefore, can reduce because the decay that dividing plate causes.
Description of drawings
Fig. 1 is a sectional view, describes the structure according to the ultrasonic flow meter of embodiments of the invention 1;
Fig. 2 is a sectional view, describes first fluid rejector shown in Figure 1;
Fig. 3 is a sectional view, describes another first fluid rejector;
Fig. 4 is the sectional view of the structure of ultrasonic flow meter, has described another first fluid rejector;
Fig. 5 is a sectional view, describes another first fluid rejector according to embodiments of the invention 1;
Fig. 6 is a front view, describes another example of eyelet seal member shown in Figure 4;
Fig. 7 is the sectional view of A-A along the line shown in Figure 1, describes to measure flow channel;
Fig. 8 is a front view, describes eyelet shown in Figure 6;
Fig. 9 is a sectional view, describes the structure according to the ultrasonic flow meter of embodiments of the invention 2;
Figure 10 is a planimetric map, describes the introducing portion according to embodiments of the invention 2;
Figure 11 is the sectional view of B-B along the line shown in Figure 9, describes to measure flow channel;
Figure 12 is the sectional view of the structure of ultrasonic flow meter, describes another Non-Uniform Flow rejector;
Figure 13 is a sectional view, describes the structure according to the ultrasonic flow meter of embodiments of the invention 3;
Figure 14 is a sectional view, describes another first fluid rejector according to embodiments of the invention 3;
Figure 15 is a sectional view, describes the structure according to the ultrasonic flow meter of embodiments of the invention 4;
Figure 16 is a front view, describes the propagation ducts flow conditioner of observing according to the streamwise of embodiments of the invention 4;
Figure 17 is depicted in the correction factor characteristic when not having the propagation ducts of Figure 15 flow conditioner;
Correction factor characteristic when Figure 18 is depicted in good grounds the present invention's the propagation ducts flow conditioner of embodiment 4;
Figure 19 is a sectional view, describes another propagation ducts flow conditioner according to embodiments of the invention 4;
Figure 20 is a kind of sectional view of structure of ultrasonic flow meter, describes another propagation ducts flow conditioner according to embodiments of the invention 4;
Figure 21 is a stereographic map, describes another propagation ducts flow conditioner according to embodiments of the invention 4;
Figure 22 is the sectional view of A-A along the line shown in Figure 20, describes the propagation ducts flow conditioner;
Figure 23 is a sectional view, describes to be provided with the position of propagation ducts flow conditioner;
Figure 24 is a stereographic map, describes another propagation ducts flow conditioner;
Figure 25 is a stereographic map, describes another propagation ducts flow conditioner;
Figure 26 is a front view, describes another propagation ducts flow conditioner that streamwise is observed;
Figure 27 is a sectional view, describes the structure according to the ultrasonic flow meter of embodiments of the invention 5;
Figure 28 is a sectional view, describes the fluid rejector according to embodiments of the invention 5;
Figure 29 is a sectional view, describes another fluid rejector according to embodiments of the invention 5;
Figure 30 is a sectional view, describes another fluid rejector according to embodiments of the invention 5;
Figure 31 is a sectional view, describes another fluid rejector according to embodiments of the invention 5;
Figure 32 is a kind of sectional view of ultrasonic flow meter, describes another example according to embodiments of the invention 5;
Figure 33 is a stereographic map, describes another example according to the fluid rejector and the propagation ducts flow conditioner of embodiments of the invention 5;
Figure 34 is a sectional view, describes the flow channel according to the ultrasonic flow meter of embodiments of the invention 6;
Figure 35 is a sectional view, describes the eyelet unit according to embodiments of the invention 6;
Figure 36 is a sectional view, describes to concern according to the position between the mutual relative ultrasonic transducer of embodiments of the invention 6;
Figure 37 is a front view, describes the exit surface according to first channel isolation of embodiments of the invention 6;
Figure 38 is a front view, describes the exit surface according to second channel isolation of embodiments of the invention 6;
Figure 39 is a front view, describes the exit surface according to the 3rd channel isolation of embodiments of the invention 6;
Figure 40 is a front view, describes the exit surface according to the channel isolation of embodiments of the invention 6;
Figure 41 is a sectional view, describes the communication means according to the channel isolation of embodiments of the invention 6;
Figure 42 is a sectional view, describes another example according to the channel isolation of embodiments of the invention 6;
Figure 43 is a front view, describes the exit surface of channel isolation shown in Figure 42;
Figure 44 describes the structure of conventional ultrasonic flow meter; And
Figure 45 describes the structure of the ultrasonic flow meter of another kind of routine.
Embodiment
Below with reference to the description of drawings embodiments of the invention.
(embodiment 1)
The sectional view explanation of Fig. 1 is according to the structure of the ultrasonic flow meter of embodiments of the invention 1.In Fig. 1, Ref. No. 6 be by flow channel wall 7 around the measurement flow channel, Ref. No. 8 and 9 is upstream and downstream ultrasonic transducers, be installed on the flow channel wall 7 respectively and via conduct vibrations rejector 10 so that toward each other.The distance that is spaced each other of upstream ultrasonic transducer 8 and downstream ultrasonic transducer 9 is L, be θ with respect to the pitch angle of the flow direction of measuring flow channel 6.Ref. No. 11 and 12 is upstream eyelet and downstream eyelet, is used to make ultrasonic transducer 8 and 9 to be exposed to respectively and measures flow channel 6. Eyelet 11 and 12 all is arranged in the flow channel wall 7 with sunk structure.Ref. No. 13 is a ultrasonic propagation passage (drawing chain line by two point represents), along this passage, the ultrasound wave that emits from one of ultrasonic transducer 8 respect to one another and 9 is directly propagated into another ultrasonic transducer 8 and 9, and is not subjected to the reflection of wall.Ref. No. 14 is first fluid rejectors of establishing for upstream eyelet 11, be used to reduce the measured fluid that flows into this upstream eyelet 11, Ref. No. 15 is first fluid rejectors of establishing for downstream eyelet 12, is used to reduce the measured fluid that flows into this downstream eyelet 12.Ref. No. 16 is arranged on the second fluid rejector of the upstream extremity of ultrasonic propagation passage 13, is used to reduce the measured fluid that flows into upstream and downstream eyelet 11 and 12.This second fluid rejector 16 is installed in the recess 7a, and this recess 7a is arranged in the flow channel wall 7.
Fig. 2 has illustrated and has been the set first fluid rejector of downstream eyelet 12.Ref. No. 21 is eyelet seal members, and it has a lot of ultrasonic transmission hole 22, can transmit ultrasound wave and therefrom pass through.This eyelet seal member 21 is to be provided with across ultrasonic propagation passage 13, so as to cover eyelet 12 and with the same plane of measuring flow channel surface 6a on extend, therefore stop measured fluid to flow into eyelet 12.At this, eyelet seal member 21 is netted or analog, has a lot of ultrasonic transmission hole 22, can transmit ultrasound wave therefrom passes through, it directly is set in the part corresponding to the measurement flow channel of the measurement flow channel 6 of eyelet 12 surface 6a, and with measure flow channel surface 6a at grade flow so that can not upset fluid.
Fig. 3 is illustrated as upstream eyelet 11 and the first fluid rejector 14 of setting.This first fluid rejector 14 is outstanding from flow channel wall 7, and comprises the air deflector 14a and the guide surface 14b that is arranged on the upstream extremity of this air deflector 14a of level and smooth outstanding structure, and the projecting height with smooth increases.
The second fluid rejector 16 has a direction and regulates parts 16a and a fluctuation inhibition parts 16b, direction is regulated the flow direction that parts 16a is used to regulate measured fluid, and fluctuation suppresses parts 16b and is used to make the fluctuation that flowing velocity distribution is even or the minimizing fluid flows.This direction is regulated parts 16a and is comprised that the xsect that is used for measuring flow channel 6 is divided into the partition of fraction.It is less and have a lot of small transmission channels along the xsect of measuring flow channels 6 that fluctuation suppresses the length of parts 16b streamwise.
Ref. No. 17 is upstream bent portions, it is connected with an operation valve (not shown) that is arranged on along the upstream extremity of measuring flow channel 6, Ref. No. 18 is downstream bent portions, and it is connected with an outlet (not shown) that is arranged on along the downstream end of measuring flow channel 6.By adopting bent portion 17 and 18, this flow channel is arranged in the little structure.Ref. No. 19 is measurement control assemblies of a connection ultrasonic transducer 8 and 9, be used to realize hyperacoustic transmission and reception, Ref. No. 20 is calculating units, is used for according to measuring the calculated signals flowing velocity that control assembly 19 sends, so that calculate flow.
Below will illustrate and utilize hyperacoustic flow measurement operation.Utilize to measure the function of control assembly 19, ultrasound wave along the ultrasonic propagation passage 13 of measuring flow channel 6 and between ultrasonic transducer 8 and 9, pass and measure flow channel 6 and be sent out and receive.Particularly, measure travel-time T1, promptly the ultrasound wave that sends from upstream ultrasonic transducer 8 receives needed time quantum by downstream ultrasonic transducer 9.Also will measure travel-time T2, promptly the ultrasound wave that sends from downstream ultrasonic transducer 8 receives needed time quantum by upstream ultrasonic transducer 9.
Calculating unit 20 calculates flow according to measured travel-time T1 and T2 and according to calculating formula shown below.
At this, represent along the flow velocity of the measured fluid of the length direction of measuring flow channel 6 with V, be used for θ and represent angle between flow direction and the ultrasonic propagation passage, represent distance between ultrasonic transducer 8 and 9 with L, represent the velocity of sound by measured fluid to calculate flow velocity V with C according to following calculating formula.
T1＝L/(C+Vcosθ)
T2＝L/(C—Vcosθ)
By the inverse of T1 being deducted the calculating formula of the inverse of T2, can therefrom remove velocity of sound C, thereby can obtain following calculating formula:
V＝(L/2cosθ)((1/T1)—(1/T2))
Because the value of known θ and L, can calculate flow velocity V by the value of T1 and T2.Consider the measurement of air velocity, angle θ=45 degree wherein, distance L=70 millimeter, velocity of sound C=340 meter per second, flow velocity V=8 meter per second.So, T1=2.0 * 10
-4Second and T2=2.1 * 10
-4Second.Therefore, instant measurement is in the cards.
Next step, by measuring flow channel 6, can obtain flow Q by following expression along area S perpendicular to the xsect of flow direction:
Q＝KVS
Wherein, K is a correction factor, and it is owing to the velocity flow profile by xsect S is determined.
Therefore, obtain flow velocity by calculating unit 20.
Next step will describe the measurement flow channel and the measuring operation thereof of this ultrasonic flow meter.Measured fluid enters to be measured flow channel 6 and has uneven flowing or the fluid fluctuation, this is owing to increase/reduce cross-sectional area set in flow channel by the operation valve (not shown), this operation valve is arranged on the upstream extremity of measuring flow channel 6, or because by bent portion 17.Then, the direction of the second fluid rejector 16 of the upstream extremity by being arranged on ultrasonic propagation passage 13 is regulated parts 16a, regulate direction and make fluid be not easy to flow into eyelet 11 and 12, make mobile in measuring flow channel 6 be adjusted and reduce flow disturbance, simultaneously, suppress that parts 16b reduces because the disturbance that the fluctuation in the fluid that fluctuation fluid or analogue cause causes by fluctuation, so that further suppression fluid inflow eyelet 11 and 12.Then, fluid enters ultrasonic propagation passage 13.It can be a mesh members, foam components (foamed member), microwell plate, non-woven fabric or analog that fluctuation suppresses parts 16b, has bigger aperture ratio, can be configured to streamwise and have little thickness.Therefore, suppress parts 16b by fluctuation and can reduce pressure loss, therefore, can reduce in fluid along the fluctuation of measuring flow channel, not pressure boost loss.And, can reduce the fluctuation of fluid in the high zone of flow velocity, so that be suppressed at the fluctuation in hyperacoustic travel-time, thereby can increase higher limit, and further improve measuring accuracy for flow or fluid-velocity survey.
Next step, eyelet 12 is bored in before the downstream ultrasonic transducer 9, strong eddy current wherein takes place easily, because eyelet 12 is to extend with the direction of an acute angle with respect to this measurement flow channel, be provided with eyelet seal member 21 (for example being net) along the measurement flow channel surface 6a that measures flow channel 6, it has much can therefrom transmit hyperacoustic ultrasonic transmission hole 22, it is provided with along the measurement flow channel surface 6a that measures flow channel 6, for making the fluid of adjusting by the second fluid rejector 16 and measurement flow channel surface 6a coplane, so that can not upset fluid.Therefore, can further increase effect that the fluid that suppresses measured flows into downstream eyelet 12, and reduce vortex or flow disturbance in the ultrasonic propagation passage 13 significantly.On the other hand, for upstream eyelet 11, form first fluid rejector 14 by air deflector 14a, this air deflector 14a is arranged near the upstream extremity of eyelet 11 with sunk structure, flow into eyelet 11 so that further reduce fluid, shown in the arrow among Fig. 3, thereby reduce flow disturbance (for example vortex) and make fluid stable.Because the direction of upstream eyelet 11 extensions is with respect to measuring flow channel 6 in obtuse angle, the intensity of any eddy current is less than the eddy current that causes because of downstream eyelet 12, and therefore, wherein adverse influence is very little, and first fluid rejector 14 can be set.Yet,, can make fluid further stable by providing first fluid rejector 14 to upstream eyelet 14.And, first fluid rejector 14 can with flow channel wall 7 global formations so that simplified structure and reducing cost.
Therefore, ultrasound wave is sent out and receives along ultrasonic propagation passage 13 between ultrasonic transducer 8 and 9, and the fluid in the passage 13 is stable.Therefore, can improve ultrasound wave reception level, thereby realize the high precision fluid-velocity survey, and reduce the decay of the ultrasound wave that causes because of the fluctuation in the fluid, thereby improve higher limit for flow measurement.
And, owing to can improve ultrasound wave reception level, can reduce power consumption for ultrasonic transmission by the stable of convection cell.In addition, when eyelet seal member 21 just is provided with for downstream eyelet 12, can reduce damping capacity, and, reduce power consumption by being reduced to the driving energy that ultrasonic transducer 8 and 9 is imported by the ultrasound wave of eyelet seal member 21.Therefore, when adopting battery-operated this equipment (gas meter that for example is used for family), may only need the battery of a very little electric weight just can in long-time, use this gas meter continuously.
Fig. 4 is a kind of sectional view of ultrasonic flow meter, and another kind of first fluid rejector has been described.The parts identical with function with the parts of embodiment shown in Fig. 1 to 3 and function adopt identical Ref. No., and no longer elaborate, and the parts that are different from the foregoing description will concentrate on following being described.For downstream eyelet 12, the eyelet seal member 21a (as the parts of the embodiment of Fig. 1) with ultrasonic transmission hole 22 is set up as first fluid rejector 15.Similarly, for upstream eyelet 11, the eyelet seal member 21b (as the parts of the embodiment of Fig. 1) with ultrasonic transmission hole 22 is set up as first fluid rejector 14.The position that these two eyelet seal member 21a and 21b are set up is in same plane with measurement flow channel surface.Therefore, by eyelet seal member 21a and 21b being set for upstream eyelet 11 and downstream eyelet 12 respectively, can flow into eyelet by suppression fluid, so that avoid vortex or flow disturbance, thereby improve measuring accuracy, even also realized the raising of precision for the measurement of fluctuation fluid with moment refluence.And, flow disturbance in eyelet 11 and 12 can be considerably reduced, can reduce because the refraction of the ultrasound wave that causes of any disturbance and (or) reflection, thereby ultrasonic emitting and reception that realization has desired signal to noise ratio (S/N ratio) (S/N) performance, and reduce emission and export, drive input thereby reduce, therefore reduced power consumption.
Below, another embodiment of eyelet seal member 21a and 21b is described not with reference to accompanying drawing.Because upstream eyelet 11 with respect to the bearing of trend of measuring flow channel 6 in obtuse angle, the intensity of eddy current is less.Therefore, even the aperture that is arranged on upstream eyelet 11 perforations seal member 21b also can expect to have fluid and suppress effect than greater than the aperture ratio that is arranged on downstream eyelet 12 perforations seal member 21a.Therefore, in this embodiment, the aperture that upstream eyelet seal member 21b has is than the aperture ratio greater than downstream eyelet seal member 21a.Because the area in each ultrasonic transmission hole of upstream eyelet seal member 21b is bigger, hyperacoustic propagation loss is less than the propagation loss of downstream eyelet seal member 21a.Therefore, when the eyelet seal member with same apertures ratio is used in upstream extremity and downstream end, can reduce hyperacoustic propagation loss thus, thereby be used for the driving input of ultrasonic transducer and can reduce power consumption by reduction.
Fig. 5 has illustrated another embodiment of the first fluid rejector 15 that is provided with for downstream eyelet 12.Ref. No. 23 is air deflectors, and it is arranged near the upstream extremity of downstream eyelet 12, comprises eyelet seal member 21.This air deflector 23 is with plate or vane structure, and it adjusts the direction of fluid, makes measured fluid not flow into eyelet 12.Therefore, eyelet 12 disposes eyelet seal member 21 and air deflector 23 as first fluid rejector 15.
For eyelet 12, adjust the direction of fluid by air deflector 23, so that reduce the amount of the fluid that flows to downstream eyelet 12.Even there is small volume of fluid to flow to downstream eyelet 12, stop fluid to flow into eyelet 12 by eyelet seal member 21, therefore so that avoid the flow disturbance (for example vortex) in eyelet 12, and stablize fluid in the ultrasonic propagation passage 13, thereby further improve measuring accuracy.And, owing to adopt air deflector 23 can reduce the flow that arrives eyelet seal member 21,, can reduce foreign matter adhering on eyelet seal member 21 even when the foreign matter that contains fine particle in the fluid to be measured (for example dust).Therefore, mainly can consider hyperacoustic transmittability and select the specification of eyelet seal member 21, thus the degree of freedom of having improved in this selection or wherein being provided with.And, can further improve hyperacoustic transfer capability, with raising sensitivity, thereby reduce power consumption or improve precision.Can adopt similar structure for upstream eyelet 11, so that further improve measuring accuracy.
Fig. 6 has illustrated another embodiment of eyelet seal member.Ref. No. 24 is mesh members, and it contains the ultrasonic transmission hole 22 that is arranged in the reticulate texture.This mesh members 24 is arranged on the eyelet 12 as eyelet seal member 21 along measuring flow channel surface 6a.At this, the flow direction of measured fluid is level basically along measuring flow channel 6, along measuring flow channel surface 6a eyelet 11 and 12 is set, and it is vertical basically.For the setting of this measurement flow channel, mesh members 24 is to be made of the mesh portion 25 that tilts, and it is the angle of α that this part 25 has with respect to horizontal direction, makes along continuous straight runs that mesh portion is not set.
When the foreign matter (for example being included in dust wherein) of fine particle when measured fluid band flowed, this foreign matter may be attached on the mesh members 24 that is arranged in the downstream eyelet 12.Yet because this mesh members 24 is to be made of the mesh portion 25 that tilts, this mesh portion 25 has a gradient with respect to horizontal direction, and the foreign matter of accompanying fine particle is easy to slide along this gradient.Therefore, can avoid causing the obstruction of this mesh members 24, guaranteeing hyperacoustic transmission, thereby flow and flow velocity be proceeded stable measurement because of the deposition of the foreign matter of the fine particle that adheres to.Though above-mentioned explanation is at downstream eyelet 12, is applicable to upstream eyelet 11 too.
Fig. 7 has illustrated the sectional view of the measurement flow channel A-A along the line shown in Fig. 1.Have a rectangle along the xsect perpendicular to this measurement flow channel 6 of the direction of fluid, its width is W and the end face that is oppositely arranged mutually along ultrasonic transducer 8 and 9, and it highly is H.This measurement flow channel 6 is to be made of flow channel wall 7, and flow channel wall 7 is to closely cooperate mutually with the flow channel wall 7c with protuberance by the flow channel wall 7b that will have depression to obtain.Because xsect is a rectangle, in measuring flow channel 6, realized two-dimentional flowing, suppressed issuable fluid fluctuation in each corner portions located of this rectangular cross section by the second fluid rejector 16, can promote that therefore the two dimension in this measurement flow channel 6 flows.And, because the height H of the measurement flow channel 6 between ultrasonic transducer is constant, can increase measured zone that ultrasonic propagation passes through ratio, thereby create conditions for the mean flow rate of realizing convection cell carries out high-acruracy survey with respect to total cross-sectional area of this flow channel.
Be understandable that, here the rectangular cross section that is adopted also comprises rectangle substantially, wherein in each angle of rectangular cross section, has circular portion (turning R), so that guarantee the durability of manufacturing equipment (for example when flow channel wall 7 are the metal patterns that adopted when forming) by casting die.
Fig. 8 has illustrated the hole shape of eyelet 12, and this eyelet 12 is provided with along the measurement flow channel of the measurement flow channel 6 shown in Fig. 7 surface 6a and has a rectangular cross section.Hole shape along the eyelet 12 of measuring flow channel surface 6a has a rectangle, its on one side 12a on the direction that is substantially perpendicular to the direction of fluid (in shown in the arrow), extend by measuring flow channel 6 by figure, its another side 12b extends on the direction of the direction that is arranged essentially parallel to fluid.
Therefore, in measuring flow channel 6, eyelet 12 has on the direction of longshore current body a constant length to arbitrary height, as indicated among the figure with D, therefore, can balancedly send and receive ultrasound wave with respect to short transverse H, and therefore realize passing the same measurement of measuring flow channel 6, thereby realize high-acruracy survey.And, the length D of the eyelet of this streamwise is the length that is caused when having circle when this eyelet or containing the arch section of equal area, therefore can further reduce to measure in the flow channel 6 flow disturbance and (or) flow into the fluid of eyelet 12, thereby improve measuring accuracy.Though foregoing description is at downstream eyelet 12, it should be understood that along the hole shape of the upstream eyelet 11 of measuring flow channel surface 6a also can be rectangle, so that further improve measuring accuracy.
As mentioned above, in ultrasonic flow meter of the present invention, by being the first fluid rejector 15 that is provided with for the downstream eyelet at least, reduce measured fluid and flow into eyelet 12, thereby can reduce flow disturbance between ultrasonic transducer 8 and 9 significantly, therefore improve measuring accuracy and to the higher limit of flow measurement.This first fluid rejector 15 can be an eyelet seal member 21, and it has ultrasonic transmission hole 22, suppresses the effect that measured fluid flows into eyelet so that further increase, thereby stablizes the fluid in the eyelet.And, though can guarantee hyperacoustic propagation by ultrasonic transmission hole 22, eyelet seal member 21 can only be for downstream eyelet 12 is provided with, so that further reduce hyperacoustic decay, thereby reduce driving input and power consumption, and improve measuring accuracy for ultrasonic transducer.
The first fluid rejector 14 that is provided with for downstream eyelet 11 comprises the eyelet seal member 21b with ultrasonic transmission hole 22.Therefore, can reduce the influx that fluid flows into the upstream and downstream eyelet significantly, thereby improve higher limit, even also can improve measuring accuracy for fluid with adverse current to flow measurement.
The aperture of the eyelet seal member 21b that is provided with for upstream eyelet 11 is than the aperture ratio greater than the eyelet seal member 21a that is provided with for downstream eyelet 12.Therefore, can reduce hyperacoustic propagation loss, thereby can improve, and reduce power attenuation by the driving input that reduces ultrasonic transducer to the higher limit of flow measurement with for the measuring accuracy of adverse current.
The opening of each in the eyelet 11 and 12 enters measures flow channel 6, and its shape is to have an edge to be substantially perpendicular to the limit that fluid extends by the direction of the direction of measurement flow channel 6.Therefore, can be with respect to the short transverse of measuring flow channel 6 and transmissions/receptions ultrasound wave balancedly, and the aperture length of shortening eyelet of streamwise in the measurement flow channel.Therefore, can further reduce the flow disturbance that causes because of this eyelet, thereby further improve measuring accuracy.
(embodiment 2)
The cross-sectional view explanation of Fig. 9 is according to the structure of the ultrasonic flow meter of embodiments of the invention 2.In Fig. 9, those adopt identical Ref. No. with Fig. 1 identical parts and function to the embodiment shown in Figure 8, and no longer elaborate, and are different from parts in the foregoing description and will concentrate and be described as follows.
Ref. No. 26 is Non-Uniform Flow rejectors that are arranged in the introducing portion 27, and this introducing portion 27 measures an inlet of flow channel 6 and has a lot of tiny access portal 26a.When the fluid that flows into introducing portion 27 had deviation in its velocity flow profile, before this fluid was admitted to measurement flow channel 6, this Non-Uniform Flow rejector made velocity flow profile even.Ref. No. 28 is valve units, and it is connected with the upstream extremity of bent tube section 17, and has a connector 29, and it is open to introducing portion 27.This valve unit 28 is provided with by-pass valve control 32, and it has a valve seat 30 and with respect to the valve part 31 of valve seat 30.Ref. No. 33 is fluid intakes that are arranged on the upstream extremity of valve seat 30, and fluid flows into by this inlet.Ref. No. 34 is outlet port unit, and it is connected with the downstream end of bent tube section 18, and has a fluid egress point 35, and fluid flows out by this outlet.Ref. No. 36 is springs, is used to make valve part 31 to be partial to valve seat 30, and Ref. No. 37 is driver parts, and for example solenoid or motor are used for driver's valve door part 31 and open or close this operation valve 32.
Next step will illustrate the operation of this ultrasonic flow meter.When operation valve 32 was opened, measured fluid flowed into by fluid intake 33, flows through valve seat 30 and connector 29, and flowed into introducing portion 27.The fluid that flows into introducing portion 27 have flow direction and (or) homogeneity that is lowered in the velocity flow profile, and has a unevenness (for example fluctuation), this be because the pipeline configuration upstream of fluid intake 33 and (or) influence of path by bending channel, this bending channel is by valve unit 28.Yet, when fluid flows through the thin channel opening 26a of the Non-Uniform Flow rejector 26 that is arranged in the introducing portion 27, flow direction and (or) unevenness in the velocity flow profile improves, the fluctuation of fluid is reduced, and measures flow channel 6 thereby provide stable fluid to flow into.As mentioned above, in measuring flow channel 6, regulating parts 16a by the direction of the second fluid rejector 16 makes the flow rate of fluid of the xsect by measuring flow channel 6 distribute to become even, fluid is adjusted on direction, make that the possibility of fluid inflow eyelet 11 and 12 is littler, further reduce the fluid fluctuation and suppress parts 16b by fluctuation.Then, fluid flows into ultrasonic propagation passage 13.In addition, first fluid rejector 14 and 15 the position is set respectively near on upstream and downstream eyelet 11 and 12 the upstream extremity, so that reduce the fluid that flows into eyelet 11 and 12.Therefore, by sending and receive ultrasound wave along ultrasonic propagation passage 13, can realize high-precision fluid-velocity survey between ultrasonic transducer 8 and 9, fluid is further stablized in ultrasonic propagation passage 13, and with the upstream line structure-irrelevant.In addition, by the ultrasonic attenuation that reduces to cause, can further increase higher limit for flow measurement because of the fluctuation in the fluid.
Figure 10 is the planimetric map of explanation introducing portion 27.Non-Uniform Flow rejector 26 the whole zone that the position strides across introducing portion 27 is set.Ref. No. 29a represents first aperture location (drawing chain line by two point represents) of connector 29, wherein, operation valve 32 is along the left and right directions setting (as shown in Figure 9) of figure, connector 29 is set at the left side of figure, Ref. No. 29b represents second aperture location (drawing chain line by two point represents) of connector 29, wherein, operation valve 32 is along the fore-and-aft direction setting of Fig. 9, and connector 29 is set at the reverse side of this figure.The cross-sectional area Sa of introducing portion 27 is made as greater than the cross-sectional area Sb that measures flow channel 6, this xsect is defined as a width and is W, highly is the rectangle of H (referring to Figure 11) (Sa〉Sb), thereby increase erection space, win aperture location 29a and the second aperture location 29b can be set in the introducing portion 27 for Non-Uniform Flow rejector 26.Therefore, can reduce the loss of the pressure of the measured fluid that causes because of Non-Uniform Flow rejector 26.In addition, even when the first and second aperture location 29a and 29b with respect to introducing portion 27, and when position deviation is arranged for the various configuration/structures of valve unit 28, before fluid flows into measurement flow channel 6, thin channel opening 26a by Non-Uniform Flow rejector 26 can make even fluid distribution.Therefore, for the flow channel structure of measuring flow channel 6 and (or) variation in the pipeline configuration upstream, for example valve unit 28, can guarantee measuring accuracy, thereby can improve the degree of freedom in the installation.
In addition, as shown in Figure 11, the aperture size Ta of the access portal 26a of Non-Uniform Flow rejector 26 (each the has an aperture) fluctuation that is set to less than the second fluid rejector 16 suppresses the aperture size Tb (Ta＜Tb) of the access portal 16c (each has an aperture) of parts 16b.Therefore, Non-Uniform Flow rejector 26 is compared with the second fluid rejector 16, and it is with better function, can make the deviation in fluid fluctuation or the velocity flow profile become even.Therefore, by Non-Uniform Flow rejector 26 is set, can provides more stable fluid to enter and measure flow channel 6.Therefore, even when fluid flows into the connector passed through 29 and in the position deviation arranged from upstream extremity, measure flow channel 6, the measurement that can realize strengthening precision by fluid is flowed in more uniform mode.Even when the fluid that enters has fluctuation, the fluctuation of fluid is reduced, make and can improve measuring accuracy, even for the fluid that fluctuates.In addition, the fluctuation that the aperture size of the access portal 26a of Non-Uniform Flow rejector 26 is set to less than the second fluid rejector 16 suppresses the aperture size of the access portal 16c of parts 16b, enter the exotic quality (for example dirt or dust) of measuring flow channel 6 thereby can reduce, so that guarantee normal measuring operation and improve reliability.And, the cross-sectional area Sa of Non-Uniform Flow rejector 26 is set to larger than the cross-sectional area Sb that measures flow channel 6, therefore can reduce the loss in the measured fluid pressure, even and when being attached with foreign matter on the Non-Uniform Flow rejector 26, avoid the degeneration of measurement index.
Figure 12 illustrates the another kind of embodiment of Non-Uniform Flow rejector 26.In introducing portion 27, be provided with the first Non-Uniform Flow rejector 26b, be provided with the second Non-Uniform Flow rejector 26c in the export department 38 on the downstream end of measuring flow channel 6.The second Non-Uniform Flow rejector 26c comprises a lot of thin channel opening 26d, as the first Non-Uniform Flow rejector 26b.Adopt this structure, when at the upstream extremity of measuring flow channel 6 fluid fluctuation or fluid deviation being arranged, the first Non-Uniform Flow rejector 26b provides the above-mentioned effect that reduces to fluctuate and suppresses the effect of heterogeneous fluid.When in the downstream end of measuring flow channel 6 fluid fluctuation or fluid deviation being arranged, the second Non-Uniform Flow rejector 26c provides effect that reduces to fluctuate and the effect that suppresses heterogeneous fluid.Therefore, can improve measuring accuracy and realize stable measurement, and needn't pay close attention to the flow channel of measuring flow channel 6 structure and (or) pipeline configuration upstream or downstream, thereby further improve degree of freedom aspect the equipment of installing and measuring.And, even, can realize strengthening the measurement of precision, and realize stable measurement when producing moment by fluctuation during adverse current, and with the location independent of fluctuation sources.In addition, the aperture size of the access portal 26d of the second Non-Uniform Flow rejector 26c can be set to less than the aperture size of the access portal 16c of the second fluid rejector 16, and (or) cross-sectional area of export department 38 can be set to larger than the cross-sectional area of measuring flow channel 6, so that above-mentioned effect is provided, as have 27, the second Non-Uniform Flow rejector 26c of introducing portion and be set at export department 38.Therefore, can improve measuring accuracy, the degree of freedom in installing and (or) reliability of this device prevention foreign matter.
As mentioned above, in the ultrasonic flow meter of the embodiment according to the present invention 2, Non-Uniform Flow rejector 26 comprises access portal 26a, and each opening has a tiny hole, Non-Uniform Flow rejector 26 is arranged in the introducing portion 27, and introducing portion 27 is arranged on the upstream extremity of measuring flow channel 6.Therefore, can provide stable fluid to enter and measure in the flow channel 6, and with flow channel structure on the upstream extremity of measuring flow channel 6 and (or) pipeline configuration is irrelevant so that reduce the flow disturbance between the ultrasonic transducer 8 and 9.Therefore, can further increase the higher limit of this measurement and further improve measuring accuracy.And, can realize stable measurement, and with the upstream extremity of measuring flow channel 6 on flow channel structure and (or) pipeline conditional independence, thereby improve degree of freedom in the installation of this measurement mechanism.
The cross-sectional area of introducing portion 27 or export department 38 can be set to larger than the cross-sectional area of measuring flow channel 6.Therefore, can increase the installation cross-sectional area of Non-Uniform Flow rejector 26,, thereby avoid increasing pressure loss so that reduce the pressure loss that causes because of Non-Uniform Flow rejector 26.In addition, can increase the cross-sectional area of introducing portion 27 or export department 38, thereby be convenient to the connection of this measurement mechanism, need not change the shape of introducing portion or export department, even when the shape of flow channel on upstream extremity or the downstream end or pipeline configuration is changed.Therefore, can be implemented in a kind of measurement mechanism that has the degree of freedom of increasing in its assembling.
The aperture size of the access portal of Non-Uniform Flow rejector 26 is less than the aperture size that is arranged on the access portal in the second fluid rejector 16.Therefore, though when upstream or downstream connector be provided with offset the time, fluid can flow in measuring flow channel equally, thereby measures the measuring accuracy with increase and create conditions for making.And, even when measured fluid has fluctuation, can provide fluid to enter the measurement flow channel, because access portal has small pore size, the fluctuation in the fluid is reduced, thereby has improved measuring accuracy, even for the fluid that fluctuates.In addition because the access portal of Non-Uniform Flow rejector has small pore size, can reduce to enter this measurement mechanism dirt and (or) amount of dust, thereby improve along the reliability of the measuring operation of measuring flow channel.
The situation that bent portion 17 and 18 is bent in the width W direction of measuring flow channel 6 has been described in the present embodiment.It should be understood, however, that bent portion 17 and 18 also can be chosen in height H direction or any other direction of measuring flow channel 6 and be bent, bent portion 17 can be bent different angles with 18.
(embodiment 3)
The sectional view of Figure 13 has illustrated the structure according to the ultrasonic flow meter of embodiments of the invention 3.In Figure 13, parts and the function identical with function with the parts of the embodiment shown in Fig. 1 to 12 have identical Ref. No., and no longer describe in detail, and the parts that are different from the foregoing description will be described as follows by concentrated.
Ref. No. 39 is first fluid rejectors, is used to reduce the detected fluid that flows into eyelet 11, and no matter detected fluid flows forward or flows backward along measurement flow channel 6.First fluid rejector 39 comprises near the air deflector 40a the upstream extremity that is arranged on eyelet 11 and is arranged near the air deflector 40b of downstream end of eyelet 11.Ref. No. 41 is second fluid rejectors, and it is set on the downstream end of ultrasonic propagation passage 13.This second fluid rejector 41 comprise the direction of a flow direction that is used for detected fluid regulate parts 41a and one be used to make velocity flow profile evenly or the fluctuation that reduces the fluid fluctuation suppress parts 41b.Above-mentioned first fluid rejector 15 comprises the eyelet seal member 21 with ultrasonic transmission hole 22, and it is to be provided with for downstream eyelet 12.This second fluid rejector 16 comprises that direction is regulated parts 16a and fluctuation suppresses parts 16b, and it is set at the upstream extremity of ultrasonic propagation passage 13.
Fluid situation and measuring operation thereof in the measurement flow channel of this ultrasonic flow meter below will be described.At first, detected fluid flow forward and by the situation of measuring flow channel 6 under, measure flow channel 6 even heterogeneous fluid or fluctuation fluid enter, the fluid being stoped by the second fluid rejector 16 or first fluid rejector 39 or 15 (as described in the embodiment 1) flows into eyelet 11 and 12.Therefore, this fluid is stabilized in ultrasonic propagation passage 13, thus can improve measuring accuracy and (or) for the higher limit of this measurement.
Secondly, when fluctuation causes moment adverse current or when having changed the direction of fluid, or because wrong pipeline connects when causing reverse fluid flow, reverse fluid may enter measures flow channel 6.Even this situation, first fluid rejector 15 or 41 pairs of such reversed flow of the 39 or second fluid rejector work, and as to forward fluid, enter eyelet 11 and 12 to stop this fluid.Therefore, even, can reduce detected fluid and flow into eyelet, as to forward fluid when the fluctuation fluid causes moment during reversed flow, and reduce flow disturbance between ultrasonic transducer 8 and 9 significantly, thereby improve measuring accuracy and for the higher limit of flow measurement.And, even for reversed flow, can realize increasing the measurement of precision, and improve the degree of freedom of installing, thereby improve convenience.
A kind of situation of below having described is, first fluid rejector 39 comprises the protuberance of air deflector 40a and 40b, and air deflector 40a and 40b are provided with along a surface, in this surface, eyelet 11 is open, and respectively near the upstream extremity of eyelet 11 with near the downstream end of eyelet 11.It should be understood, however, that this protuberance can be set at around eyelet 11 and (or) eyelet 12 (not shown) around the position.And, abovely can provide first fluid rejector 39 by adopting, even so that also can improve measuring accuracy and improve convenience for stronger reversed flow with reference to Fig. 2 or the described eyelet seal member of Fig. 5.
Another embodiment of Figure 14 first fluid rejector.Below Shuo Ming situation is that the first fluid rejector is to be provided with for downstream eyelet 12.Ref. No. 23 is air deflectors, and it is arranged on the position near the upstream extremity of eyelet 12, and comprising eyelet seal member 21, Ref. No. 42 is air deflectors, and it is arranged on the position near the downstream end of eyelet 12.Each air deflector 23 and 42 is to be set up with the structure of plate or blade and the regulated fluid flow direction, makes detected fluid not flow into eyelet 12.Therefore, in this embodiment, the first fluid rejector comprises eyelet seal member 21 and air deflector 23 and 42, they be set at respectively eyelet 11 and (or) upstream or the downstream of eyelet 12.
At this, for flowing forward and, regulating its flow direction, so that reduce the Fluid Volume that flows into eyelet 12 by the air deflector on the upstream extremity that is arranged on eyelet 12 23 by measuring the fluid of flow channel 6.For reversed flow and by measuring the fluid of flow channel 6, regulate its flow direction by the air deflector on the downstream end that is arranged on eyelet 12 42, so that reduce the Fluid Volume that flows into eyelet 12.If also have fluid to flow into eyelet 12, even it is a spot of, stop it to flow into eyelet 12 by eyelet seal member 21, so that stop the flow disturbance (for example vortex) in eyelet 12, therefore and stablize fluid in the ultrasonic propagation passage 13, be not always the case for the fluid that flows forward or the fluid of reversed flow, thereby further improve measuring accuracy.
Owing to can reduce the Fluid Volume that flows to eyelet seal member 21 by air deflector 23 and 42, even when including fine particle foreign matter (for example dust) in the detected fluid, can reduce foreign matter adhering on eyelet seal member 21.Therefore, mainly be to consider the ultrasound wave transfer capability for the selection of the specification of eyelet seal member 21, thus the degree of freedom of improving this selection or wherein being provided with.And, can further improve the ultrasound wave transfer capability, with raising sensitivity, thereby reduce power attenuation or improve precision.Eyelet seal member 21 and air deflector 23 and 42 also can be for upstream eyelet 11 is provided with, as are the downstream eyelet 12, so that provide similar effect for eyelet 11.And, can further improve measuring accuracy for counter fluid, therefore can improve hyperacoustic transfer capability, so that improve sensitivity and reduce power consumption or the raising measuring accuracy.
As mentioned above, the ultrasonic flow meter of the embodiment 3 of employing according to the present invention, even when fluid has fluctuation and causes that moment is during reversed flow, can reduce the detected fluid that flows into eyelet, as the situation in fluid forward, and reduce flow disturbance between the ultrasonic transducer significantly, thereby improve measuring accuracy and to the higher limit of flow measurement.And, even for counter fluid, can realize more high-precision measurement, and improve the degree of freedom of installing, thereby improve convenience.
Air deflector is set at the upstream extremity and the downstream end of eyelet.Therefore, for along forward fluid and the counter fluid of measuring flow channel, can further improve measuring accuracy, suppression fluid flows into eyelet, and stops foreign matter to enter this eyelet.Therefore, even for fluctuation fluid, can keep stable measuring accuracy for a long time, thereby improve durability and reliability with counter fluid.
(embodiment 4)
The sectional views of Figure 15 the structure of ultrasonic flow meter of the embodiment 4 according to the present invention.In Figure 15, parts and the function identical with function with the parts of the embodiment shown in Fig. 1 to 14 have identical Ref. No., and no longer describe in detail, and the parts that are different from the foregoing description will be described as follows by concentrated.
Ref. No. 43 is arranged on the propagation ducts flow conditioner on the upstream extremity of ultrasonic propagation passage 13.Propagation ducts flow conditioner 43 is set at the position that is arranged essentially parallel to ultrasonic propagation passage 13 and has slightly at interval with ultrasonic propagation passage 13, so that can not bring interference to hyperacoustic propagation, ultrasonic propagation passage 13 extends and oblique wear measurement flow channel 6.
Figure 16 has illustrated propagation ducts flow conditioner 43, can see it being the direction of longshore current body and by measuring flow channel 6.Propagation ducts flow conditioner 43 is set to be measured in the flow channel 6, and it has circular cross section.Ref. No. 13a is a ultrasonic propagation passage, and as measuring as shown in the sectional view of flow channel 6, this figure is along (measuring the short transverse of flow channel 6) perpendicular to the direction intercepting of the drawing of Figure 15.Propagation ducts flow conditioner 43 along the width of short transverse greater than ultrasonic propagation passage 13a along the width of drawing the short transverse that chain line represents with two point, and be provided with the adjusting parts 44 that much are exposed to fluid.
The operation of this ultrasonic flow meter below will be described.Detected fluid enters to be measured flow channel 6 and has because the increase and decrease of cross-sectional area or because heterogeneous fluid or the fluid fluctuation that causes by bent portion 17, this increase and decrease is to be provided by the operation valve (not shown) that is arranged on the upstream extremity of measuring flow channel 6 in the fluid passage.Then, promote (facilitate) disturbance of fluid by the adjusting parts 44 of propagation ducts flow conditioner 43, propagation ducts flow conditioner 43 directly is arranged at the upstream of ultrasonic propagation passage 13, to extend all routes, from upstream ultrasonic transducer 8 near near downstream ultrasonic transducer 9, therefore, promoted flow disturbance equally in whole zone by ultrasonic propagation passage 13.In this mode, from the upstream extremity to the downstream end, the fluctuation in the fluid situation is reduced in ultrasonic propagation passage 13, so that promote in ultrasonic propagation passage 13 measurement to mean flow rate.Particularly when flow velocity less (when flow hour) and thereby fluid flow into when measuring flow channel 6 as laminar flow, the propagation ducts flow conditioner 43 in the ultrasonic propagation passage 13 has promoted flow disturbance.Therefore, the difference between this flow disturbance and (when flow is big) causes in ultrasonic propagation passage 13 when flow velocity is the big flow disturbance is little, and fluid flows into measures the fluid of flow channel 6 as disturbance.Therefore, can be on wide flow range from low discharge to big flow, the fluid of disturbance stably ultrasonic propagation passage 13.And, the position that is provided with of propagation ducts flow conditioner 43 is oblique wear measurement flow channels 6, therefore, compare be set at the length of extending and being obtained during perpendicular to the position of measuring flow channel 6 when propagation ducts flow conditioner 43, the propagation ducts flow conditioner 43 in measuring flow channel 6 can have bigger length.Therefore, can provide the propagation ducts flow conditioner 43 with larger aperture ratio, the measurement mechanism of being realized has the pressure loss that reduces.
Adopt the measurement flow channel 6 of this structure, as mentioned above, obtain flow velocity V, obtain flow by the cross-sectional area S and the correction factor K that measure flow channel 6 according to ultrasonic propagation time T1 and T2.Correction factor K changes in zone of transition, wherein the transition in flow district be the laminar region to turbulent flow area, as shown in figure 17, do not have propagation ducts flow conditioner 43 to extend along ultrasonic propagation passage 13.Therefore, when in measured flow the error of Δ Qm taking place, for example, correction factor K changes Δ K1 substantially, thereby causes the augmented flow measuring error.The generation of this error may be because the fluctuation of the fluid situation that the variation of Reynolds number (Reynolds number) causes, the variation of Reynolds number is the change owing to the viscosity that flows, and this change is because the variation of the component ratio of the variation of fluid temperature (F.T.) or fluid.When particularly causing the variation of gas componant because of the variation in season or area at the flow of measuring fluid (for example town gas or liquefied petroleum gas (LPG) LPG) and in the fluid, need to consider this error.
Yet, when propagation ducts flow conditioner 43 is provided with along ultrasonic propagation passage 13, as in the present embodiment, can reduce poor between correction factor K in the less laminar region of flow velocity and the correction factor in the turbulent flow area, as shown in figure 18, because equally can the disturbance fluid from the upstream extremity to the downstream end in ultrasonic propagation passage 13.And the variation in the correction factor is less in zone of transition, and in zone of transition, fluid carries out the transition to flow-disturbing (disturbed flow) from laminar flow.Therefore, correction factor is average.So even when error delta Qm having occurred in measured flow, the variation of correction factor can be enough little, for example Δ K2 (K2＜K1), thus be convenient to improve measuring accuracy.This is to change or the composition of the fluid advantage when changing when temperature.Therefore, can further improve measuring accuracy, particularly when measuring the flow of combustion gas (town gas or liquefied petroleum gas (LPG)), the variation of this composition and variation of temperature are contingent.
In example discussed above, the length of propagation ducts flow conditioner 43 from inlet end 43a to endpiece 43b is constant basically and strides across the width W direction of measuring flow channel 6.Yet,, have only more endpiece 43b to extend, and inlet end 43a does not extend along ultrasonic propagation passage 13 along ultrasonic propagation passage 13 near ultrasonic propagation passage 13 as in another embodiment of propagation ducts flow conditioner 43 shown in Figure 19.In ultrasonic propagation passage 13, from the upstream extremity to the downstream end, equally also will promote disturbance.Therefore, it should be understood that the length from inlet end 43a to endpiece 43b can change according to the position of broad ways.And, though propagation ducts flow conditioner 43 just extends on the part corresponding to the circular cross section of the measurement flow channel 6 of ultrasonic propagation passage 13, it should be understood that, it is to extend by the height H direction of this xsect that propagation ducts flow conditioner 43 can be selected its setting, to promote the stability of correction factor K.And, though the setting of the endpiece 43b of propagation ducts flow conditioner 43 is arranged essentially parallel to the ultrasonic propagation passage 13 in the present embodiment and extends, it should be understood that, propagation ducts flow conditioner 43 is set to any other layout, as long as it is set at the roughly the same position with respect to the width W direction of measuring flow channel 6, to downstream end, propagation ducts flow conditioner 43 can be provided with some depressed parts or protuberance along endpiece 43b from the upstream extremity of ultrasonic propagation passage 13.
Figure 20 has illustrated the structure of ultrasonic flow meter, and another embodiment of propagation ducts flow conditioner wherein has been described.In Figure 20, parts and the function identical with function with the parts of the embodiment shown in Fig. 1 to 19 have identical Ref. No., and no longer describe in detail, and the parts that are different from the foregoing description will be described as follows by concentrated.
Ref. No. 45 is propagation ducts flow conditioners, and it is set at the downstream end of ultrasonic propagation passage 13.The setting of this downstream propagation ducts flow conditioner 45 is arranged essentially parallel to ultrasonic propagation passage 13 and has slightly at interval with ultrasonic propagation passage 13, disturbs so that hyperacoustic propagation is not produced, and ultrasonic propagation passage 13 extends also tiltedly wear measurement flow channel 6.Ref. No. 46 is one and regulates parts that it is set in the downstream propagation ducts flow conditioner 45 and is subjected to the influence of fluid.Therefore, ultrasonic propagation passage 13 by propagate upstream channel flow regulator 43 and downstream propagation ducts flow conditioner 45 around.
The operation of this ultrasonic flow meter below will be described.The width W direction of adjusting parts 44 in passing ultrasonic propagation passage 13 by propagation ducts flow conditioner 43 balancedly promotes flow disturbance, and propagation ducts flow conditioner 43 is set directly at the upstream of the ultrasonic propagation passage 13 that passes the width W direction of measuring flow channel 6.And this downstream propagation ducts flow conditioner 45 is combined around ultrasonic propagation passage 13 with propagate upstream channel flow regulator 43, so that provide a buffer brake to the fluid in the ultrasonic propagation passage 13.Therefore, it is stable that the fluid situation is evenly reached, and further stablize correction factor.And, owing to the variation of downstream line structure or because the situation that detected fluid is used, can cause fluctuating or analogue and the fluid situation in the ultrasonic propagation passage 13 exerted an influence, and these influences can be reduced, and measure so can realize stable flow rate.Even, still may keep stable correction factor and improve measuring accuracy when reversed flow takes place.
Figure 21 illustrates the stereographic map of propagation ducts flow conditioner 47, and propagation ducts flow conditioner 47 obtains by combination propagate upstream channel flow regulator 43 and downstream propagation ducts flow conditioner 45.Ref. No. 48 is links, be used for propagate upstream channel flow regulator 43 being connected with downstream propagation ducts flow conditioner 45 and combining, Ref. No. 49 is that a ultrasound wave transmits window, and the hole of an opening is wherein arranged, so that do not hinder ultrasound wave to transmit.
Propagation ducts flow conditioner 47 is by link 48 connections and combines, therefore can avoid upstream regulation parts 44 and downstream to regulate parts 46 offsets respect to one another.So just can come stabilized fluid, thereby make the fluctuation of measurement very little by the variation that reduces fluid situation in the ultrasonic propagation passage 13.And, the structure that can reinforce propagation ducts flow conditioner 47 by link 48, thus the thickness or the size of each propagation ducts flow conditioner 43 and 45 can be reduced, comprise and regulate parts 44 and 45.Therefore, the fluid situation in the ultrasonic propagation passage 13 is become evenly, and have nothing to do in the position of passing the xsect of measuring flow channel 6.And, by reducing to regulate the thickness or the size of parts 44 and 46, the aperture area that detected fluid flows through can be increased, thereby the pressure loss in the flow channel can be reduced to measure.And, owing to adopt link 48 to reinforce propagation ducts flow conditioner 43 and 45, can use for a long time and can not be out of shape, thereby improve durability and reliability.Though situation about below having illustrated is that the setting of link 48 is to extend at the turning of propagation ducts flow conditioner 47, it should be understood that link 48 can be set at any position that other is suitable for reinforcing, as long as it does not hinder hyperacoustic propagation.
The sectional view of Figure 22 has illustrated another xsect according to measurement flow channel 6 A-A along the line of embodiment 4.Ref. No. 50 is to define the flow channel wall of measuring flow channel 6, and it has rectangular cross section, and its width is W, highly is H.The setting of regulating parts 44 and 46 is to pass this rectangular cross section.
Measuring operation about rectangular cross section below will be described.Ultrasonic propagation passage 13 extends by the width W direction of ultrasonic propagation passage 13, therefore with respect to the height H direction of rectangular cross section, can strengthen the ratio of survey area.Ratio along the survey area of height H direction can be invariable from the upstream extremity to the downstream end passing the width W direction.Therefore, can realize high-acruracy survey to the mean flow rate of fluid in the ultrasonic propagation passage 13.For the fluid in ultrasonic propagation passage 13, in a wide flow range, from the upstream extremity to the downstream end, balancedly promote flow disturbance with adjusting parts 44 and 46 by propagation ducts flow conditioner 43 and 45, thus can the high-acruracy survey mean flow rate.Therefore, needn't adopt the length breadth ratio (W/H) that increases rectangular cross section to improve the method for measuring accuracy,, flow in measuring flow channel 6, to produce stable two dimension so that increase flatness (flatness) wherein.Define the upper surface and the lower surface reflection supersonic wave of the height H of xsect jointly, the influence of the ultrasound wave that reflects in order to reduce can be determined height H.Therefore, the specification of xsect can freely be set according to the height H of flow channel,, thereby help increasing the sensitivity that ultrasound wave sends or receives so that reduce the interference of reflection wave.And, can improve measuring accuracy by the variation that reduces in the correction factor.
In addition, can adopt the less and length breadth ratio of flatness,, thereby reduce pressure loss in this measurement flow channel so that reduce along the length of xsect contact detected fluid less than 2 rectangular cross section.It should be understood that, here the rectangular cross section that is adopted also comprises rectangle substantially, a circular portion (turning R) is wherein arranged, so that guarantee the durability of manufacturing equipment (for example when flow channel wall 7 are the metal patterns that adopted when forming) by casting die in each angle of this rectangular cross section.
Figure 23 illustrate propagation ducts flow conditioner 43 in the present embodiment or 45 and ultrasonic propagation passage 13 between distance.Distance between propagate upstream channel flow regulator 43 and ultrasonic propagation passage 13 is Gu, and the distance between downstream propagation ducts flow conditioner 45 and ultrasonic propagation passage 13 is Gd.
Propagation ducts flow conditioner 43 or 45 and ultrasonic propagation passage 13 between distance optimised, so that for various detected fluid stable correction factor in a wide flow range for measured value, thus balancedly disturbance fluid distribution from the upstream extremity to the downstream end in ultrasonic propagation passage 13.For example, when Reynolds number hour, can reduce apart from Gu and (or) Gd, when Reynolds number is big, can increase apart from Gu and (or) Gd.Reynolds number is directly proportional with the inverse of mobile viscosity.Therefore, for the less fluid of viscosity, increase apart from Gu and (or) Gd, for the bigger fluid of viscosity, reduce apart from Gu and (or) Gd.For example, the mobile viscosity of propane flammable gas is 4.5mm
2/ s (300 ° of K), the mobile viscosity of methane gas is 17.1mm
2/ s (300 ° of K).Therefore, for propane flammable gas to increase apart from Gu and (or) Gd, for methane gas to reduce apart from Gu and (or) Gd.In this case, propagation ducts flow conditioner 43 or 45 should be set at from the big as far as possible position of the distance of ultrasonic propagation passage 13, propagate and by the amount of propagation ducts flow conditioner 43 or 45 ultrasound waves that reflect, this ultrasound wave influences fluid-velocity survey so that reduce by ultrasonic propagation passage 13.Yet,, should optimize this distance for flowing of this fluid of disturbance balancedly from the upstream extremity of ultrasonic propagation passage 13 to downstream end.It should be understood that, apart from Gu with needn't have identical value apart from Gd, but can be set as different values, according to the shape of the adjusting parts 44 of propagation ducts flow conditioner 43 and (or) aperture size, and adjusting parts 46 shapes of propagation ducts flow conditioner 45 and (or) difference between the aperture size, change apart from Gu with apart from the relation between the Gd.It should be understood that when the shape of regulating parts 44 and 46 and (or) when aperture size is changed according to type of fluid, the relation between this distance and the viscosity can be different from above described.
Therefore, only need not change the shape and size of measuring flow channel 6, just can realize high-acruracy survey, thereby improve convenience the user to different fluids by changing the propagation ducts flow conditioner.And, by adopting the various universal components that are used for different situations, can provide a kind of measuring equipment cheaply.
The stereographic map of Figure 24 has illustrated another embodiment of propagation ducts flow conditioner.Ref. No. 51 is adjusting parts of propagation ducts flow conditioner 43.Regulating parts 51 is to be made of a mesh members, for example gauze or have the fabric of less thickness at flow direction.Also can in propagation ducts flow conditioner 45, be provided with as regulate the like (not shown) of parts 51.It should be understood that and to adopt mesh members to constitute the propagation ducts flow conditioner separately, need not adopt the outside framework 44a of propagation ducts flow conditioner.
Because regulating parts 51 is to be made of the mesh members that has less thickness at flow direction, can reduce the size of propagation ducts flow conditioner 43 or 45 streamwises, so that it can be installed in the little space, thereby reduce to measure the size of flow channel.For the mesh members that covers ultrasonic propagation passage 13, employing is difficult for the material of reflection supersonic wave, and the combination employing has the mesh members of large aperture ratio, the advantage that is had is the ultrasonic reflections that has reduced by propagation ducts flow conditioner 43 or 45, thereby reduced the influence of reflection wave, thereby realized high-acruracy survey the interference of measuring accuracy.
The stereographic map of Figure 25 has illustrated another embodiment of propagation ducts flow conditioner.Ref. No. 52 is adjusting parts of propagation ducts flow conditioner 43.Regulate parts 52 and comprise net member 53, it has the wall 52a that a lot of streamwises extend.In propagation ducts flow conditioner 45 (not shown), also can be provided with as regulating the like of parts 52.
Because wall 52a streamwise extends, the direction that can regulate the fluid that flows through propagation ducts flow conditioner 43.Particularly by reducing the fluid that flows into eyelet 11 and 12, can reduce the generation of eddy current, eyelet 11 and 12 is set directly at before ultrasonic transducer 8 and 9, thereby can reduce because of eddy current causes hyperacoustic decay, thereby creates conditions for making measurement reach bigger flow range.And, can be facing one direction with each wall 52a, make that the velocity flow profile in ultrasonic propagation passage 13 is balanced more, thus the further velocity flow profile of equilibrium in ultrasonic propagation passage 13, thus measuring accuracy improved.
Figure 26 is the front view of another embodiment when streamwise is observed of propagation ducts flow conditioner.Ref. No. 54 expressions are arranged on the adjusting parts in the propagation ducts flow conditioner 43, wherein, according to along the cross section position of measuring flow channel 6, can change two spacings between the adjacent adjusting parts, so that change the cross-sectional area of each through hole 55.Here, the position of through hole 55a is along enclosing outside the xsect of propagation ducts flow conditioner 43, and its cross-sectional area can be set to larger than the cross-sectional area of the through hole 55b in the center section of propagation ducts flow conditioner 43.Particularly, the cross-sectional area of through hole 55 increases towards the direction of the respective end of propagation ducts flow conditioner 43 and along width W direction or height H direction.In propagation ducts flow conditioner 45 (not shown), also can be provided with as regulating the like of parts 54.
Below will be described operation.When propagation ducts flow conditioner 43 is not set, being difficult to obtain even flow distributes, because the flow rate of fluid that flows along the wall of measuring flow channel 6 reduces because of fluid viscosity, and the fluid that flows through among the measurement flow channel 6 has bigger flow velocity.Yet, in this example, being provided with propagation ducts flow conditioner 43, the cross-sectional area of through hole 55 is reduced among the xsect of measuring flow channel 6 simultaneously, so that reduced flow velocity.The cross-sectional area of through hole 55 is increased in the periphery, edge, makes its channel resistance less than the resistance at middle part, thereby has suppressed the reduction of flow velocity.Therefore, the velocity flow profile in ultrasonic propagation passage 13 is uniform.Therefore, in the ultrasonic propagation passage 13 that extends at oblique wear measurement flow channel 6, flow velocity is uniform from the upstream extremity to the downstream end, so, the mean flow velocity value that measured mean flow velocity value can be measured with passing the xsect of measuring flow channel 6 in ultrasonic propagation passage 13 is all consistent fully from the laminar flow scope to the flow-disturbing scope in wide flow range, thereby the change of regime flow coefficient, and improve measuring accuracy.
As mentioned above, in ultrasonic flow meter according to embodiment 4, propagation ducts flow conditioner 43 is set directly at the upstream of ultrasonic propagation passage 13, and swim from it along the whole zone of ultrasonic propagation passage 13 and to hold downstream end to extend, thereby promoted to pass the disturbance (disturbance) of fluid in the whole zone of ultrasonic propagation passage 13.Therefore, the characteristic of the correction factor that causes because of fluctuations in discharge can be stabilized in whole flow measurement range, thereby improves measuring accuracy.Even when the physical characteristic value of fluid changes, can keep measuring accuracy, thereby improve practicality and convenience.And, pass the oblique setting of measuring flow channel 6 by propagation ducts flow conditioner 43, can increase its aperture ratio, thereby reduce the pressure loss of measurement mechanism.And, pass the oblique setting of measuring flow channel 6 by propagation ducts flow conditioner 43, can guarantee to regulate the position is set can passes of parts 44 than large tracts of land.Therefore, can not increase pressure loss, reducing the spacing between the adjacent adjusting parts 44, and increase the quantity of regulating parts 44, promote effect thereby strengthen flow disturbance.
Therefore, by upstream and downstream propagation ducts flow conditioner 43 and 45 around ultrasonic propagation passage 13, thereby can be, thereby further stablize correction factor and further improve measuring accuracy so that the disturbance situation from the upstream extremity of ultrasonic propagation passage 13 to downstream end becomes evenly.And, reduce along of the influence of the flow condition of measuring flow channel 6 by downstream propagation ducts flow conditioner 45 downstream end.Therefore, can realize stable measurement, and have nothing to do, thereby improve degree of freedom in the installation of this measurement mechanism in the pipeline situation of the downstream end of measuring flow channel 6.And, for along measuring flow channel mobile and reverse flowing forward, all obtain identical effect, so, even for undulating flow or reverse direction flow, can stablize correction factor, thereby improve measuring accuracy.
Upstream and downstream propagation ducts flow conditioner 43 and 45 is combined.Therefore, can stop and be stabilized between the propagation ducts flow conditioner skew in the distance or upstream regulation parts and downstream and regulate offset between the parts, thereby make the error reduction of measurement mechanism.And link has been reinforced the propagation ducts flow conditioner, thereby can reduce to regulate the size and the thickness of parts.Therefore, flow condition in the ultrasonic propagation passage is become evenly or reduce to measure pressure loss in the flow channel.
By only changing the distance that the propagation ducts flow conditioner leaves ultrasonic propagation passage 13, can adopt the measurement flow channel at large, and irrelevant with the type of detected fluid, thus convenience improved.And, can keep stable measuring accuracy, and irrelevant with the type of detected fluid.In addition, owing to can adopt the measurement flow channel at large, can reduce cost.
In one embodiment, regulate the structure that parts can be set to mesh members.Therefore, can reduce the installing space of propagation ducts flow conditioner, thereby reduce to measure the size of flow channel with respect to flow direction.
In one embodiment, regulate the structure that parts can be set to net member, its wall streamwise extends, and with the adjusting flow direction, thereby further makes the velocity flow profile in the ultrasonic propagation passage become evenly, and therefore improves measuring accuracy.
According to along the cross section position of measuring flow channel, can change two spacings between the adjacent adjusting parts.Therefore,, can optimize the size that each regulates parts, keep the length that reduces of regulating the parts streamwise simultaneously according to along the cross section position of measuring flow channel.Therefore, the velocity flow profile in the ultrasonic propagation passage is become evenly, and reduce to regulate the length of parts streamwise and since velocity flow profile evenly, thereby reduce pressure loss, improved measuring accuracy simultaneously.
By adopting rectangular cross section to measuring flow channel, can increase survey area with respect to the overall measurement cross-sectional area, thereby for the measurement from the upstream extremity of ultrasonic propagation passage to downstream end under same case creates conditions, thereby the mean flow rate of being convenient to convection cell carries out high-acruracy survey.
By adopting rectangular cross section to the propagation ducts flow conditioner that is provided with along the ultrasonic propagation passage with to measuring flow channel, there is no need to increase the length breadth ratio of this xsect to produce two-dimentional flowing, the specification of xsect can freely be set according to the height of flow channel, so that reduce the interference of reflection wave, thereby be that the sensitivity that increases hyperacoustic transmission/reception creates conditions.And, measure xsect by adjusting, can reduce the loss of measuring the pressure in the flow channel, so that reduce, and need not make the measurement xsect too smooth along the length of this measurement xsect contacting with fluid.
Situation about having described in the present embodiment is that bent portion 17 and 18 is to be bent in the width W direction of measuring flow channel 6.It should be understood, however, that also to be chosen in crooked bent portion 17 and 18 on the height H direction of measuring flow channel 6 or any other direction, bent portion 17 can be bent to different angles with 18.
(embodiment 5)
Figure 27 is the cross-sectional view that illustrates according to the structure of the ultrasonic flow meter of the embodiment of the invention 5.In Figure 27, have identical Ref. No. with components identical and functional part in the embodiment shown in Fig. 1-2 6, below will be not described in detail, in the following description, describe the parts that are different from the foregoing description in detail with focusing on.
Ref. No. 56 is a fluid rejector (influent suppressor), is used to reduce the detected fluid influx that flows into eyelet 11 and 22.This fluid rejector 56 is set at the downstream end (downstream side) of above-mentioned propagation ducts flow conditioner 43, and described propagation ducts flow conditioner 43 is set at the upstream extremity of ultrasonic propagation passage 13.This fluid rejector 56 comprises the first fluid rejector 57 that is formed by eyelet seal member 21, and this eyelet seal member 21 has much can therefrom transmit hyperacoustic ultrasonic transmission hole 22, shown in the enlarged diagram of Figure 28.Eyelet seal member 21 extends through ultrasonic propagation passage 13, and with the measurement flow channel of eyelet 11 and 12 surface 6a coplane so that reduce the amount of the fluid that flows into eyelet 11 and 12.
Figure 29 illustrates another embodiment of this fluid rejector.First fluid rejector 58 comprises air deflector 58a and guide surface 58b.Set air deflector 58a is outstanding from the flow channel wall 7 on the immediate upstream extremity of upstream eyelet 11.Guide surface 58b has a level and smooth height that rises, and is positioned at the upstream extremity of air deflector 58a.First fluid rejector 58 makes the fluid that flows through near measurement flow channel surface 6a depart from wall, so that fluid does not enter eyelet 11.When propagation ducts flow conditioner and the interchannel distance of ultrasonic propagation hour, air deflector 58a, guide surface 58b and propagation ducts flow conditioner 43 can be integrally formed in together, so that the second fluid rejector is provided.
In Figure 30, Ref. No. 60 is for providing air deflector 60a to obtain one second fluid rejector by suppressing parts 60b to fluid, and described air deflector is positioned at the side near the propagation ducts flow conditioner 59 of measuring flow channel surface 6a.Thus, the propagation ducts flow conditioner 59 and the second fluid rejector 60 are combined together.
The flow through state of ultrasonic flow meter of detected fluid below will be described.At first, detected fluid has fluid heterogeneous or the fluid fluctuation enters measurement flow channel 6, this heterogeneous fluid or fluctuation are that rising/declines by the flow path cross sectional area that is provided by the operation valve (not shown) that is arranged on the upstream extremity of measuring flow channel 6 causes, and/or are because to pass through bent portion 17 caused.Then, promote the disturbance of (facilitate) these fluids by adjusting parts 44 near the set propagation ducts flow conditioner 43 of this ultrasonic propagation passage 13.Propagation ducts flow conditioner 43 is set at the upstream near ultrasonic propagation passage 13, extend with near omnirange ground, be easy to make this flow disturbance on the whole area of crossing over ultrasonic propagation passage 13, to become balanced thus near the ultrasonic transducer downstream 9 of upstream ultrasonic transducer 8.Like this, the variation of fluid situation on the ultrasonic propagation passage 13 from the upstream extremity to the downstream end is lowered, and is beneficial on ultrasonic propagation passage 13 measurement to average flow velocity.Particularly, when this flowing velocity less (flow is little), and therefore this fluid flows into as laminar flow when measuring flow channel 6, promotes this flow disturbance in the ultrasonic propagation passage 13 by propagation ducts flow conditioner 43.So when this flowing velocity big (flow is big), and therefore this fluid flows into as flow-disturbing when measuring flow channel 6, this flow disturbance and cause the difference of flow disturbance of ultrasonic propagation passage 13 less.Thus, might from one than low discharge fluid the passage of disturbance ultrasonic propagation stably 13 in the scope of the broad of big flow.In addition, propagation ducts flow conditioner 43 is set to oblique extending through and measures flow channel 6.Thus, the length that had in measuring flow channel 6 of this propagation ducts throttle regulator 43 can be longer than when propagation ducts throttle regulator 43 and be set to the length that obtained when measurement flow channel 6 is extended orthogonally.So, can provide a big aperture ratio to propagation ducts flow conditioner 43, and realize the measurement mechanism that the pressure loss reduces.
Near the flowing of eyelet below will be described.At first, in the time only will being used as the fluid rejector for the first fluid rejector 57 or 58 that downstream eyelet 12 is provided with, can reduce the fluid that flows into the downstream eyelet effectively, because the downstream eyelet extends with respect to the acutangulate direction of this fluid, so around this eyelet, be easy to occur strong whirlpool, to reduce the flow disturbance between the ultrasonic transducer effectively, improved higher limit thus to flow measurement.Particularly, when eyelet seal member 21 was first fluid rejector 57, this suppression effect that might further raise also reduced flow in the eyelet.In addition, be provided for two eyelets 11 with this eyelet seal member 21 and compare, can reduce the amount of ultrasonic attenuation, can reduce the driving of ultrasonic transducer input thus and reduce this power consumption with 12 situation.
Then, when this fluid rejector is the first fluid rejector that is provided with for upstream and downstream eyelet 11 and 12, disturbance in the eyelet can be reduced effectively, this disturbance accounts for the major part of the total flow disturbance in the described ultrasonic propagation passage, may improve measuring accuracy thus and to the higher limit of flow measurement.Particularly, when eyelet seal member 21 is first fluid rejector 57, can reduce flow disturbance effectively for following current or adverse current in measuring flow channel.Be appreciated that, when providing the first fluid rejector 58 that comprises air deflector 58a for upstream eyelet 11 and eyelet 12 provides the first fluid rejector 57 that comprises eyelet seal member 21 downstream, might further reduce the flow disturbance between ultrasonic transducer, and reduce the amount of this ultrasonic attenuation, reduce the power consumption that is used for this ultrasonic transducer thus.
In addition, when the fluid rejector for when providing fluid to suppress the second fluid rejector that parts obtain to the propagation ducts flow conditioner, might suppress to flow into the flow of this eyelet.In addition,, can reduce, thereby improve reliability the change in the mobile inhibition of the fluid that flows into this eyelet by the propagation ducts flow conditioner is combined with the fluid rejector.In addition, can provide miniature ultrasonic ripple propagation ducts, reduce the size of this measurement flow channel thus.
So this ultrasound wave is transmitted and received between ultrasonic transducer 8 and 9 along ultrasonic propagation passage 13, in ultrasonic propagation passage 13, fluid is stabilized.So, might realize the measurement of high-precision flowing velocity, and reduce hyperacoustic decay that the variation owing to flow causes, improve higher limit thus to flow measurement.If do not have the first fluid rejector 57 or the 58 or second fluid rejector 60, then the high current in this measurement flow channel 6 is moving may flow into eyelet 12, can produce strong whirlpool thus, because this downstream eyelet 12 is along extending with measurement flow channel 6 acutangulate directions, therefore, because the fluctuation of the flow velocity in the part of this fluid may cause the decline to the flow velocity measuring accuracy, and/or may be reduced by the ultrasonic attenuation that causes by a whirlpool the higher limit of measuring, equally for upstream eyelet 11, under the situation that does not have the first fluid rejector 57 or the 58 or second fluid rejector 60, the inflow of fluid can appear.Yet this flow is very little, because eyelet 11 is along extending with measurement flow channel 6 acutangulate directions, the intensity of whirlpool described here is less than the intensity of the whirlpool that is produced around aperture, downstream 12.Be appreciated that and come stabilized fluid further by the first fluid rejector 57 or the 58 or second fluid rejector that is provided for upstream eyelet 11.
Employed correction factor K in the time of below will describing based on transonic time T 1 and T2 acquisition flow.Propagation ducts flow conditioner 43 is set at the position near the upstream of ultrasonic propagation passage 13, and extend to its downstream end from upstream extremity along the whole zone of this ultrasonic propagation passage 13, help crossing the disturbance of fluid in the whole zone of this ultrasonic propagation passage 13 thus.Thus, this correction factor K is stabilized, and for above-mentioned change with reference to the flow velocity in the situation of Figure 17 and 18, it changes to some extent and descends.Because because the characteristic of the correction factor that the variation of flow causes is stabilized, so, improved practicality and convenience thus even when the physical characteristic value of fluid changes, still keep its measuring accuracy.In addition, by reducing the disturbance of the fluid between ultrasonic transducer significantly, can further improve the ultrasound wave reception level of crossing whole measurement range, further improved measuring accuracy thus.In addition, can reduce the flow of the fluid that flows into eyelet 11 and 12,, increase higher limit thus flow measurement so that reduce the flow disturbance between ultrasonic transducer significantly.
When the eyelet seal member be tilt with respect to horizontal direction cancellated mesh members the time, or when air deflector is set at the upstream extremity of this eyelet and downstream end, can stablizes correction factor and improve the degree of accuracy of measurement.In addition, also can be provided at the effect described in the above embodiment 1, further improve reliability thus.
Figure 31 shows another embodiment of fluid rejector.It comprises the first fluid rejector 57 with eyelet seal member 21, this eyelet seal member 21 has ultrasonic transmission hole 22, also comprise having the second fluid rejector 62 that fluid suppresses parts 62a, this fluid suppresses parts 62a and is set at the side of measuring near the propagation ducts flow conditioner 61 of flow channel surface 6a.So, can further improve the effect of this eyelet of inflow that suppresses measured fluid, thereby further improve the degree of accuracy of measuring.In addition, might reduce adhering to of foreign matter by air deflector is provided, such as the dust that is adhered to this eyelet seal member.So, can consider mainly that the transmission ultrasonic wave rate selects this eyelet seal member, and without the obstruction of worry about eyelet seal member, thereby increase the degree of freedom of this selection.In addition, might further increase ultrasonic transmissivity, with the reduction power consumption, or further improve sensitivity, so that the device that realization has desired measuring accuracy.In addition, this second fluid rejector 62 can be treated to a shape that is applicable to the flow or the physical characteristic value of detected fluid, as the part of propagation ducts flow conditioner 61, thus, is easy to it and uses this measurement flow channel 6 itself at large.In addition, can reduce disturbance in this eyelet by the multiplication effect of first and second rejectors, and can reduce the variation that convection cell flows into the inhibition of this eyelet by the combination of propagation ducts flow conditioner and fluid rejector.Thus, can improve the accuracy and reliability of measurement.In addition, can provide the ultrasonic propagation passage of miniaturization, to reduce the size of this measurement flow channel.
Figure 32 and 33 illustrates another embodiment of propagation ducts flow conditioner and fluid rejector.Ultrasonic propagation passage 13 is centered on by propagate upstream channel flow regulator 43 and downstream propagation ducts flow conditioner 45, and also provides fluid rejector 56.As shown in figure 33, propagation ducts flow conditioner 43 and 45 is connected and combines by link 48.In addition, fluid rejector 56 is fixed on the ultrasound wave transmission window 49.Fluid rejector 56 is netted, as is covered in the eyelet seal member 21 of eyelet 11 and 12.
In this structure, owing to the buffer brake that is applied by downstream propagation ducts flow conditioner 45, the flow in this ultrasonic propagation passage 13 is by balanced and stable.In addition, can realize the stable flow rate measurement to the influence of the fluid situation in the ultrasonic propagation by reducing from factors such as fluctuations, factors such as described fluctuation are that the operating position owing to the variation of downstream line structure or detected fluid produces.
In addition, fluid rejector 56 is provided for eyelet 11 and 12, so can improve the higher limit to flow measurement.
In addition, propagation ducts flow conditioner 43 and 45 is joined together, and it combines with eyelet seal member 21 as fluid rejector 56 again further.Thus, determined the position relation,, can be reduced in the variation of the fluid situation in this ultrasonic propagation passage 13 by this, and can realize the almost not stable measurement of variation as the distance between these elements.In addition, because not only propagation ducts flow conditioner 43 and 45 is combined together, and eyelet seal member 21 also combines with this propagation ducts flow conditioner 43 and 45, therefore, might further improve the physical strength of propagation ducts flow conditioner.Thus, distortion be can in a segment length service time, prevent, thus, durability and reliability improved.
Although the position that propagation ducts flow conditioner 43 is mounted is substantially parallel with ultrasonic propagation passage 13 along the width W direction of measuring flow channel 6, this propagation ducts flow conditioner 43 also may be installed in to be measured within the flow regulator 43, and this measurement flow regulator 43 has circular xsect on the edge as above-mentioned height H direction with reference to figure 16.Measure in the flow channel 6 by propagation ducts fluid conditioner 43 is installed on, can expect to obtain effect same as the previously described embodiments, described measurement flow channel has the xsect of rectangle, and is as above described referring to Figure 22.Be formed at described eyelet and have hole shape, perhaps described Non-Uniform Flow rejector is set at introducing portion on the upstream extremity of measuring flow channel maybe under the situation of the export department on the downstream end of this measurement flow channel, similarly, can expect to obtain the effect described in the foregoing description, wherein, Yi Bian described hole shape have be substantially along and fluid pass the vertical direction of direction of measuring flow channel.
As mentioned above, in ultrasonic flow meter according to embodiment 5, propagation ducts flow conditioner 43 is provided as the upstream near ultrasonic propagation passage 13, extend to its downstream end from upstream extremity with whole zone along ultrasonic propagation passage 13, thus, promoted to cross the disturbance of fluid in the whole zone of ultrasonic propagation passage 13.So, in whole fluid-velocity survey scope, can stablize the characteristic of the correction factor that causes owing to fluctuations in discharge, thereby prevent the rising of the error that causes by correction factor and improve measuring accuracy.In addition, can provide the fluid rejector, reduce the flow disturbance in the ultrasonic propagation passage thus widely to reduce the fluid that flows into eyelet.So, can improve ultrasound wave reception level and raising higher limit to flow measurement.
This fluid rejector can be the first fluid rejector that is provided for the downstream eyelet.Therefore, this fluid rejector is used for the downstream eyelet, is easy to take place strong vortex around this eyelet, because the downstream eyelet is extending with respect to the acutangulate direction of fluid.Therefore can reduce the fluid that flows into this eyelet, lowering the flow disturbance between the ultrasonic transducer effectively, thereby improve higher limit flow measurement.
This fluid rejector can be the first fluid rejector for upstream eyelet and the setting of downstream eyelet.Therefore, the disturbance in the eyelet accounts in the ultrasonic propagation passage total flow disturbance to major part, and for along following current or the adverse current measured in the flow channel, this disturbance can be reduced effectively, thereby can improve measuring accuracy and to the higher limit of flow measurement.
This fluid rejector can be the second fluid rejector by provide a fluid suppressing portion part to obtain to the propagation ducts flow conditioner.So, by with propagation ducts flow conditioner and the combination of fluid rejector, can reduce variation to the inhibition of the fluid that flow into eyelet, improve reliability thus and can consider to provide miniature ultrasonic ripple propagation ducts.Thus, can reduce the size of this measurement flow channel.
The first fluid rejector can be for having the eyelet seal member at least one ultrasonic transmission hole.Thus, cover this eyelet, can further promote inhibition effect, reduce and stablize the fluid in this eyelet thus the flow that flows into this eyelet by using this eyelet seal member.In addition, although can guarantee hyperacoustic propagation by this ultrasonic transmission hole, this eyelet seal member only is provided for the downstream eyelet, in this case, can further reduce this hyperacoustic decay, reduces driving input and the power consumption that is used for ultrasonic transducer thus.
The first fluid rejector can comprise the eyelet seal member with ultrasonic transmission hole and be arranged near the air deflector of this eyelet.So, can further promote inhibition effect to the detected fluid that flows into this eyelet, improve measuring accuracy thus.In addition, can be by providing air deflector to reduce adhering to of foreign matter, as the dust on the eyelet seal member.So, can consider mainly that transmission ultrasonic wave selects this eyelet seal member, and without the obstruction of worry about eyelet seal member, this and increased the degree of freedom of selecting.In addition, might further increase ultrasonic transmissivity, with the reduction power consumption, or further improve sensitivity, so that the device that realization has desired measuring accuracy.
First fluid rejector and the second fluid rejector by provide a fluid suppressing portion part to obtain to the propagation ducts flow conditioner that is provided for this eyelet can be provided the fluid rejector.So, can reduce the disturbance in this eyelet by the multiplication effect of first and second rejectors, and can reduce the variation that convection cell flows into the inhibition of this eyelet by the combination of propagation ducts flow conditioner and fluid rejector.Therefore, can improve the accuracy and reliability of measurement.In addition, can provide miniature ultrasonic ripple propagation ducts, reduce the size of this measurement flow channel thus.
Present embodiment shows bent portion 17 and 18 situations along the width W direction bending of measuring flow channel 6.In addition, be appreciated that bent portion 17 and 18 also can select to extend along the height H direction of measuring flow channel 6 or other any direction, and bent portion part 17 can be with different angular bend with 18.
(embodiment 6)
Figure 34 one illustrates the cross-sectional view according to the flow channel of the ultrasonic flow meter of embodiments of the invention 6.In Figure 34, have identical Ref. No. with components identical and functional part in the embodiment shown in Fig. 1-33, below will be not described in detail, in the following description, describe the parts that are different from the foregoing description in detail with focusing on.
Ref. No. 63 expression is arranged on each channel isolation of eyelet 11 and 12.This channel isolation 63 obtains by each that separate eyelet 11 and 12 along the ultrasonic propagation direction.As shown in figure 35, this channel isolation 63 has an inlet surface 65 of extending along the vibration plane 64 of ultrasonic transducer 9 and along measuring the exit surface 66 that flow channel surface 6a extends.The size of one side 67 of the vertical component of channel isolation 63 is greater than hyperacoustic half wavelength lambda/2 that are used to launch/receive, and is not the integral multiple of this ultrasound wave half-wavelength.Distance 68 between the vibration plane of the channel isolation 63 of eyelet 12 and ultrasonic transducer 9 is the integral multiple of these hyperacoustic half wavelength lambda/2.The thickness of each partition of channel isolation 63 is shorter than this hyperacoustic wavelength X.Although foregoing description is at downstream ultrasonic transducer 9, it is equally applicable to upstream ultrasonic transducer 8.
As shown in figure 36, be set to one the channel isolation 63 conllinear ground extension corresponding along each channel isolation 63 of measuring the eyelet 11 that flow channel surface 6a is provided with another eyelet 12, wherein, described measurement flow channel surface 6a is relative with ultrasonic transducer 9.
Method commonly used to flow measurement below will be described.As mentioned above, ultrasonic flow meter obtains the flow velocity V that is shown below based on the difference between the inverse of the inverse of ultrasonic propagation time T1 and transonic time T 2, and the cross-sectional area by flow velocity V and flow channel multiplies each other flowing velocity V is converted into flow.
So, as obtaining fluid velocity V as shown in the following formula:
V＝[L/(2cosθ)]×[(1/T1)-(1/T2)]
Be subjected to the influence of fluid, whether the ultrasonic propagation distance L is according to having fluid inflow eyelet to change.Particularly, based on the existence of flowing velocity or undulating flow/do not exist, fluid may enter or not enter this eyelet, changes effective propagation distance L thus and causes the error of institute's measurement of discharge.
In structure of the present invention, be arranged on the inside of measuring each eyelet in the flow channel and be divided into some littler parts.So the possibility that whirlpool takes place can be littler, and because channel isolation may reduce the flow of the fluid that flows into eyelet as the function of fluid rejector.So even when fluid velocity changes or fluctuation occurs, it is constant and correctly measure flow still might to keep effective propagation distance L.In addition, because the detected fluid in this channel isolation of ultrasonic propagation process, the reduction of sensitivity may be less than the result that can produce when using big block element.In addition, the separation owing to passage might keep this hyperacoustic linear characteristic, and realize emission/reception that it is desirable.In addition, because therefore ultrasound wave can enter this channel isolation in a right angle, and pass this passage along a straight line and advance, thereby can provide the ultrasonic propagation passage that does not have skew and almost do not have decay.In addition, because outlet is for respect to the smooth surface of measuring the flow channel surface, therefore along not having disturbance in the fluid of the perisphere of measuring the flow channel surface.In addition, because exit surface is calibrated to radiating surface, so this ultrasound wave of radiation effectively.One emitting surface of described channel isolation centering aligns with the receiving surface of another channel isolation along this hyperacoustic direct of travel, thus, can reduce by the caused reflection loss of the dividing plate in the channel isolation of relative eyelet (partitioned plate).
Half wavelength is longer than on the limit 67 of the vertical section of each channel isolation.Therefore, the glutinousness influence of this separation surfaces can be lowered, and the channel isolation that does not almost have decay may be provided thus.In addition, can be with the length setting on limit 67 be not the integral multiple of wavelength, to suppress lateral resonance, realizes thus propagating efficiently.
Can so set the distance 68 between the inlet surface of ultrasonic transducer and channel isolation, make resonance appear at the half-wave place.The thickness d of each partitioned portion of channel isolation can be set to shorter than wavelength, departing from when preventing that ultrasound wave from entering this partitioned portion, provides this hyperacousticly effect spread to be arranged and realize desired emission/reception thus.
When adopting the channel isolation of rectangular cross section, shown in Figure 37,38 and 39, can obtain same effect.When the cellular channel isolation that adopts as shown in figure 40, this cellular grid thing can be by being fixed in this eyelet easily to fix.In addition, the thickness d of partitioned portion can be fully less than hyperacoustic wavelength, and may be vertically and laterally come separately each eyelet.In addition, ultrasound wave is propagated effectively, realizes desired emission/reception thus.
A middle part at eyelet in this channel isolation has its opening.So,, so this eyelet aligns with the axis of ultrasonic transducer, can be implemented in the propagation of the higher middle section of ultrasound wave output thus effectively, thereby can improve the emission of signal by ultrasound emission/reception owing to one opening is arranged in the central authorities of this eyelet.
When adopting a polygon to make the opposite face of this channel isolation not parallel each other, disperseed along the propagation of the direction of advancing, thereby there is no fear of resonating, so ultrasound wave can be propagated effectively perpendicular to ultrasound wave.Specifically, when a boxwork material is used to have the channel isolation of opening in the central, may be owing to ultrasonic emitting/reception makes that the signal emission is more effective, wherein, described ultrasonic emitting/reception by the reduction of above-mentioned resonance effect, the effect that thickness d provided that partitioned portion is fully little, and effect spread arranged and cause the higher middle section of ultrasound wave output hyperacoustic.
In addition, as shown in figure 41, each channel isolation may be included in along the communication means 69 at a certain definite some place of its length, and it is used to make an adjacent channel connection of this channel isolation and this channel isolation.So, having reduced the total area of partitioned portion, and the decay that is caused by wall surface is minimized, the size of communication means 69 also can be greater than hyperacoustic wavelength, thereby this channel isolation can easily be interconnected.By link and partitioned portion alternately are provided, the effect that might obtain separating effect and reduce decay.
Below, another embodiment of this channel isolation is described with reference to Figure 42 and 43.Figure 42 one illustrates the cross-sectional view of the channel isolation 70 of eyelet 12.Be that with the difference of previous embodiment this partitioned portion is obtaining along a silk screen as reticular substance (wire mesh) is set on the flow channel side of this flow passage wall surface by reaching on the ultrasonic transducer of the edge direction vertical with the transonic direction, the passage length Lb of this channel isolation is shorter than the hyperacoustic wavelength X that is used to launch/receive thus.Figure 43 illustrates opening 71.
Be shorter in length than the passage length of this ultrasound wave wavelength by employing, each channel isolation can be used as the propagation ducts that has decay hardly.In addition, the space, hole in each eyelet that is provided along measurement flow channel surface is divided into some less spaces, makes whirlpool to occur, and might reduce the flow of the fluid that flows into this eyelet.Therefore, even when flow velocity changes or fluctuation occurs, also can correctly measure flow.In addition, because ultrasound wave passes gas in the channel isolation, so the reduction of the sensitivity that the reduction meeting of sensitivity can occur when using large volume o components.And, by the separation of passage, might keep this hyperacoustic linear characteristic, and realize emission/reception that it is desired.
This half-wavelength is longer than on the limit 67 of the longitudinal cross-section of channel isolation, therefore might provide a propagation ducts, and it is more not obvious to the fluid viscosity that flows through along separation surfaces, thus almost not decay.In addition, be the non-integral multiple of wavelength by length setting to suppress horizontal resonance with limit 67, propagate thereby realization is effective.
By to being provided with measurement flow channel employing channel isolation, can further reduce the flow disturbance in the eyelet as the fluid rejector of first rejector or second rejector.So, except that above-mentioned effect, also may improve higher limit to measuring.
Commercial Application
Can be seen significantly that by above-mentioned explanation ultrasonic flowmeter of the present invention provides following usefulness.
Ultrasonic flowmeter of the present invention comprises: one is arranged near the by first of this downstream eyelet at least The fluid TVS, it is for reducing the influx of the detected fluid that flows into this eyelet; Be arranged on mutually with one For the second fluid TVS of the upstream extremity of the measurement flow channel of this eyelet, should for reducing flowing into The influx of the detected fluid of eyelet, wherein, this first fluid that is provided for this downstream eyelet presses down Device processed comprises the eyelet seal member with at least one ultrasonic transmission hole. Therefore, might stablize Flowing between ultrasonic transducer, in order to add intense ultrasonic wave reception level, and by strengthening this ultrasonic wave Reception level and reduce ultrasonic waves by means of providing the fluid TVS to improve hyperacoustic decay The driving input of energy device.
Perhaps, ultrasonic flowmeter of the present invention comprises first fluid TVS and second fluid TVS, For reducing the flow of the detected fluid that flows into this eyelet, described eyelet be used for detected fluid following current and Adverse current, wherein, when fluid when forward flowing, be provided for this eyelet at first of upstream extremity The fluid TVS is one to have the eyelet seal member at least one ultrasonic transmission hole; And second fluid TVS is arranged on arrival end and the port of export of this measurement flow channel. So, even when this flow Have fluctuation and cause moment during adverse current, also can reduce the flow of the detected fluid that flows into this eyelet, Such as the situation in following current, and reduce significantly the disturbance of the fluid between ultrasonic transducer, increase thus Add certainty of measurement and to the higher limit of flow measurement.
Perhaps, ultrasonic flowmeter of the present invention comprises: along a ultrasonic propagation passage set and Has a propagation ducts adjuster that is exposed to the adjusting parts of this fluid, described ultrasonic propagation passage Between upstream ultrasonic transducer and downstream ultrasonic transducer. So being arranged on the next-door neighbour should The adjusting parts of the propagation ducts adjuster of ultrasonic propagation passage upstream are beneficial to cross from this ultrasonic wave and pass Broadcast the upstream extremity of passage to the disturbance of the fluid in the whole zone of downstream. Therefore, pass at this ultrasonic wave Broadcast passage, cross the fluidised form in whole zone of this ultrasonic propagation passage by comparably disturbance, and with stream Speed is irrelevant, wherein, described ultrasonic propagation passage broad ways near the zone of upstream eyelet to Zone near the downstream eyelet has prevented increase and raising by the caused error of correction factor thus Certainty of measurement. So, even when Reynolds number changes owing to the change of the mobile viscosity of fluid, Still keep this certainty of measurement, may realize thus bearing variations in temperature or the fluid composition of fluid The measurement mechanism that changes, thus the practicality of this device improved.
Perhaps, ultrasonic flowmeter of the present invention comprises: along a ultrasonic propagation passage set and Has a propagation ducts adjuster that is exposed to the adjusting parts of this flow, described ultrasonic propagation passage Between upstream ultrasonic transducer and downstream ultrasonic transducer and a fluid TVS, be used for Reduce the flow of the detected fluid that flow into this eyelet. So, be close on this ultrasonic propagation passage The adjusting parts of the propagation ducts flow conditioner that trip arranges are beneficial to and cross from this ultrasonic propagation passage Upstream extremity is to the disturbance of the fluid in the whole zone of downstream. Therefore, at this ultrasonic propagation passage, Cross the fluid in whole zone of this ultrasonic propagation passage by comparably disturbance, and irrelevant with flow velocity, Wherein, described ultrasonic propagation passage broad ways is from the zone of close upstream eyelet to close downstream The zone of eyelet prevents thus the increase of the error that caused by correction factor and has improved certainty of measurement. In addition, might be provided for the measurement flow channel of this eyelet, it leads to the measurement flow channel, with Just reduce the fluid that flows to eyelet, can reduce significantly thus between ultrasonic transducer passing along this ultrasonic wave Broadcast the flow disturbance of passage, and improve the higher limit to flow measurement.
Perhaps, this first fluid TVS that is provided for this upstream eyelet is an air deflector. So, Might reduce to pass the hyperacoustic propagation loss for this ultrasonic transmission hole of upstream eyelet, by This reduces the driving input to ultrasonic transducer, and reduces the fluid flow that flows into this upstream eyelet, Thereby the stable accuracy of measuring along flow disturbance and the raising of ultrasonic propagation passage.
Perhaps, this first fluid TVS that is provided for the upstream eyelet is an eyelet seal member, It has at least one ultrasonic transmission hole. So, might reduce significantly flowing into the upstream and downstream hole The fluid flow of eye has improved thus the higher limit of flow measurement and has improved and is used for even is attended by The measuring accuracy of the flow of adverse current. In addition, might be caused by this eyelet by reducing widely Flow disturbance realizes having the ultrasound emission of desired S/N characteristic/reception. Thus, can reduce biography Send output and drive input, thereby reduce power consumption.
Perhaps, be provided for the aperture ratio of eyelet seal member of upstream eyelet greater than being provided for The aperture ratio of the eyelet seal member of downstream eyelet. So hyperacoustic propagation loss can be lowered, Thereby might improve to the higher limit of flow measurement with for the measuring accuracy of adverse current, and by falling Hang down the driving input of ultrasonic transducer is reduced power attenuation.
Perhaps, the propagation ducts fluid conditioner is arranged on the upstream with respect to this ultrasonic propagation passage End and downstream. So this ultrasonic propagation passage is by upstream and downstream propagation ducts flow conditioner Surround, thereby might be balanced from the upstream extremity of ultrasonic propagation passage and the disturbance shape of downstream Attitude thus, can further be stablized correction factor and further improve measuring accuracy. In addition, this stream Moving state is to being fallen by downstream propagation ducts flow conditioner along the impact of the downstream of measuring flow channel Low. So, might realize stable measurement, and need not consider the pipe in the downstream of measurement mechanism The road situation, thus the free degree that this measurement mechanism is installed can be improved. In addition, no matter be to measure for the edge The following current of flow channel or adverse current all can obtain same effect, even so that might stablize right In the correction factor of undulating flow, thereby improve the accuracy of measuring.
Perhaps, be arranged on respect to the upstream extremity of this ultrasonic propagation passage and the propagation ducts of downstream Flow conditioner links together by a connector parts. So, might prevent and stable the propagation The position between parts is regulated in the skew of the spacing between the channel flow adjuster or upstream regulation parts and downstream Skew to change the measurement mechanism that has reduced thus. In addition, attaching parts have been reinforced propagation ducts Flow conditioner might reduce size and the thickness of these adjusting parts thus. Thereby might be balanced The pressure loss of flow channel is measured in fluid state in the ultrasonic propagation passage or reduction.
Perhaps, be arranged on respect to the upstream extremity of this ultrasonic propagation passage and the propagation ducts of downstream Flow conditioner and fluid TVS are combined together. So, might determine position relationship, as Distance between this upstream and downstream propagation ducts flow conditioner and fluid TVS is stablized this stream thus The body state. Therefore, might reduce the variation of the fluid situation in this ultrasonic propagation passage, and real Now almost do not have vicissitudinous stably measured. By this combination, might further improve this and propagate logical The mechanical strength of road flow conditioner, thus prevent distortion after its long-time use, and improve thus Its durability and reliability.
Perhaps, the fluid TVS is the first fluid TVS that arranges for the downstream eyelet. So this is years old One fluid TVS is set to for the downstream eyelet, is easy to occur strong whirlpool around this eyelet, because of For this eyelet edge, downstream and this acutangulate direction that flows are extended. So, might reduce the inflow eyelet The flow of fluid, in order to effectively reduce flow disturbance between ultrasonic transducer, it is right to improve thus The higher limit of flow measurement.
Perhaps, the fluid TVS is the first fluid TVS for upstream eyelet and the setting of downstream eyelet. So the disturbance in the eyelet can be reduced effectively, this disturbance accounts for the total stream in the ultrasonic propagation passage The major part of body disturbance thus, might improve certainty of measurement and to the higher limit of flow measurement.
Perhaps, this fluid TVS is by flowing to the propagation ducts along this ultrasonic propagation channel setting Moving adjuster provides a fluid suppressing portion part and the second fluid TVS that obtains. So, by should The propagation ducts flow conditioner is combined with the fluid TVS, might reduce flowing into the fluid of eyelet The inhibition of flow, increase thus reliability and allow to provide a kind of small-scale ultrasonic propagation ducts. In To reduce the size of measuring flow channel.
Perhaps, this fluid TVS is included as first fluid TVS and the second fluid that eyelet arranges and presses down Device processed, described second fluid TVS is by providing a fluid suppressing portion to the propagation ducts flow conditioner Part and obtaining. So, can reduce in the eyelet by the multiplier effect of the first and second fluid TVSs Disturbance, the combination by propagation ducts flow conditioner and fluid TVS can make flowing into eyelet The variation of the inhibition of fluid reduces. So, can improve certainty of measurement and reliability. In addition, can Increase measuring accuracy and reliability. In addition, can provide the small-scale ultrasonic propagation ducts, reduce thus Measure the size of flow channel.
Perhaps, the first fluid TVS is one to have the eyelet sealing at least one ultrasonic transmission hole Part. So, covering this eyelet by using the eyelet seal member, can further improve flowing into the hole The inhibition of the flow of the detected fluid of eye reduces and stablizes the fluid in this eyelet thus.
Perhaps, this first fluid TVS comprises the eyelet sealing with at least one ultrasonic transmission hole Parts and be arranged near this eyelet part air deflector. So, might further improve flowing into Inhibition to the flow of the detected fluid of eyelet further improves measuring accuracy thus. In addition, Might reduce adhering to of foreign substance by this air deflector is provided, described foreign substance is as adhering to the hole The dust of eye seal member. So, can consider mainly that ultrasonic transmittance selects this eyelet seal member, And without the obstruction of worry about eyelet seal member, increase thus the free degree of this selection. In addition, Might further increase ultrasonic transmissivity, with the reduction power consumption, or further improve sensitivity, So that the device that realization has desired certainty of measurement.
The aperture ratio of the eyelet seal member that perhaps, arranges for the upstream eyelet is greater than being the setting of downstream eyelet The aperture ratio of eyelet seal member. So hyperacoustic propagation loss can be lowered, thereby can Improving the higher limit of flow measurement and to be used for the measuring accuracy of adverse current, and by reducing ultrasonic The driving input of wave transducer is reduced power attenuation.
Perhaps, the eyelet seal member is the cancellated mesh members that tilts with respect to horizontal direction. So this network structure tilts with respect to horizontal direction, thereby might be convenient to process little particulate, As be attached to the dust of the meshing of this inclination, reduce thus this particulate that deposits amount and because of This and prevent the obstruction of this mesh members. So, might guarantee ultrasonic wave propagation and guarantor therein Be held in an interior stable certainty of measurement of considerable time section, improve thus durability and reliability.
Perhaps, this air deflector is arranged at upstream extremity and the downstream of eyelet. So, no matter for the edge Measure following current or the adverse current of flow channel, all might further improve certainty of measurement, suppress to flow into To the flow of this eyelet, and prevent that foreign substance from entering this eyelet. Therefore, even contrary for being attended by The undulating flow of stream also might keep stable measuring accuracy in a segment length time period, thus, Improve durability and reliability.
Perhaps, the Range-dependent between this propagation ducts flow conditioner and the transonic passage is in tested The type of fluid and changing. So, might be general by only changing this propagation ducts flow conditioner Use this measurement flow channel everywhere, and need not consider the type of detected fluid to have improved thus convenience The property, and can in the situation of not considering detected fluid, keep stable certainty of measurement. In addition, because should Measuring flow channel can be commonly used, and therefore might reduce cost.
The adjusting parts of this propagation ducts flow conditioner that perhaps, provides are the structure of mesh members. So, might reduce the installing space with respect to the propagation ducts flow conditioner of flow direction, by This reduces the size of measuring flow channel.
Perhaps, the adjusting parts of propagation ducts flow conditioner are the structure of net member, this lattice portion The wall surface streamwise of part extends. Thereby can transfer by the wall surface that streamwise extends Save this flow path direction, the fluid velocity distribution in the ultrasonic propagation passage become evenly, And the accuracy of improve measuring thus.
Perhaps, the interval between two of the propagation ducts flow conditioner adjacent adjusting portion parts is according to flowing along measuring The position of the cross section of moving passage and changing. So, might measure the transversal of flow channel according to the edge This hole dimension of the position optimization of face, keep to regulate simultaneously reducing of parts streamwise length. Thus, the further velocity flow profile in this ultrasonic propagation passage of equilibrium, and reduction adjusting portion The length of part streamwise has reduced the pressure loss thus, and is evenly caused by velocity flow profile simultaneously Improved measuring accuracy.
Perhaps, the edge has rectangular shape perpendicular to the cross section of the measurement flow channel of flow direction. In By adopting the cross section of rectangle, might increase the measurement face with respect to the overall measurement cross-sectional area Long-pending, allow thus under same condition, carry out upstream extremity from the ultrasonic propagation passage to downstream Fluid measurement. In addition, can increase along the bidimensionality that flows of measuring flow channel, be high thus The mean flow rate of precision measure fluid creates conditions. In addition, can come by the second fluid TVS is provided Further improve the bidimensionality of Fluid Flow in A.
Perhaps, along the cross section of the measurement flow channel of the direction vertical with flowing through wherein Fluid Flow in A Be shaped as length-width ratio less than 2 rectangle. So, needn't recently set up two dimension by improving these length and width Fluid Flow in A, and can freely set according to the height of flow channel the specification of cross section, thereby For the sensitivity that improves the ultrasonic wave transmitting/receiving creates conditions. In addition, might measure horizontal stroke by regulating The cross section reduces the pressure loss of measuring in the flow channel, in order to flatten at the measurement cross section that makes within reason Situation under, reduce to measure the length of cross section and fluid contact.
Perhaps, this perforated openings is led to the measurement flow channel, and shape wherein has on one side, its along with Passing the substantially vertical direction of direction of the fluid of measuring flow channel extends. So might with respect to This short transverse of measuring flow channel is balancedly this ultrasonic wave of transmitting/receiving, and shortens along flowing to Hole length in the eyelet of measurement flow channel. Thus, might further reduce and caused by this eyelet Flow disturbance, thereby further improve certainty of measurement.
Perhaps, the introducing portion in the upstream extremity setting of measuring flow channel is equipped with a Non-Uniform Flow TVS, it has a channel opening with an aperture. So, might provide to flow into and measure stream The stable fluid of moving passage, and no matter the shape of flow channel maybe should be measured the upstream of flow channel Pipeline configuration can reduce the flow disturbance between ultrasonic transducer thus. In addition, might be further Raising is to the higher limit of flow measurement and further improve certainty of measurement. In addition, might realize stablizing Measurement, and no matter the shape of flow channel maybe should be measured the pipeline configuration of the upstream of flow channel, from And increased the free degree that this measurement mechanism is installed.
Perhaps, be arranged on introducing portion this measurement flow channel maybe on the upstream extremity of measuring flow channel Downstream on export department each be provided with a Non-Uniform Flow TVS, it has with aperture Channel opening. So, even have undulating flow or the measured stream of the adverse current of being attended by when detected fluid Body has when the fluctuation sources of downstream, still might provide to flow into the stable of this measurement flow channel Fluid. Thus, might reduce the flow disturbance between ultrasonic transducer, with further raising convection current The higher limit of measurement amount, and further improve the accuracy of measuring. In addition, might realize stable Measure and need not consider shape, channel design or fluctuation sources, this measurement flow channel of flow channel Upstream or downstream, improve thus the free degree in the installation of measurement mechanism.
Perhaps, the cross-sectional area of this introducing portion or export department is greater than the cross section face of measuring flow channel Long-pending. Thus, might improve the installation cross-sectional area of this Non-Uniform Flow TVS, so as to reduce by The pressure loss that this Non-Uniform Flow TVS causes prevents the increase of the pressure loss thus. In addition, Can improve the cross-sectional area of introducing portion or export department, thus, even in the shape of this flow channel Or the pipeline configuration of upstream extremity or downstream also is convenient to the installation of this measurement mechanism when changing, and need not Change the shape of this introducing portion or export department. Thus, might realize having the installation freedom that has improved The measurement mechanism of degree.
Perhaps, the hole dimension of the channel opening of this Non-Uniform Flow TVS is less than suppressing at second fluid The hole dimension of the channel opening that arranges in the device. So, even being provided with when upstream or downstream connector Locational displacement, this fluid still can balancedly be flowed in measuring flow channel, are convenient to thus improve Measuring accuracy. In addition, even when detected fluid has fluctuation, the ripple that also can provide to reduce Moving fluid flows into measures flow channel, and the reduction of described fluctuation is opened by the passage with little hole dimension Mouth institute causes, thus the raising certainty of measurement, even when undulating flow occurring. In addition, because this is non-all The channel opening of the moving TVS of uniform flow has little hole dimension, therefore might reduce entering measurement component Dust and (or) amount of dirt, increase thus along the measurement operation of this measurements flow channel reliably The property.
Perhaps, another kind of ultrasonic flowmeter of the present invention comprises: the measurement that detected fluid is flowed through is flowed Passage; Be separately positioned on along the ultrasonic waves of measuring flow channel upstream extremity respect to one another and downstream The energy device; Upstream eyelet and downstream eyelet, this eyelet are used for making ultrasonic transducer to be exposed to this measurement stream Moving passage, wherein, at least one of this eyelet comprise a plurality of extend along hyperacoustic direction of propagation every From passage. So because the fluid in this this channel isolation of ultrasonic propagation process, sensitivity is basic On be not lowered. In addition, the separation owing to this passage might keep this hyperacoustic straight line Characteristic also realizes the transmitting/receiving that it is desired. In addition, set at the side surface along flow channel Orifice flow passage in the eyelet is divided into some little parts, more there is no fear of taking place thus whirlpool, and has May reduce the flow of the fluid that flow into this eyelet. Thus, even when fluctuation occurring, still may Correctly measure flow velocity.
Perhaps, have at least an eyelet to comprise a plurality of channel isolations, it is along this hyperacoustic direction of propagation Extend. So the fluid flow that flows into this eyelet can reduce by the fluid TVS, and can improve Higher limit to this measurement. In addition, because the fluid in this this channel isolation of ultrasonic propagation process, Therefore sensitivity does not almost descend. In addition, owing to the separation to this passage, might keep this super The linear characteristic of sound wave also realizes the transmitting/receiving that it is desired. In addition, at the side table along flow channel The set interior moving passage of orifice flow of eyelet of face is divided into some little parts, more there is no fear of thus sending out Give birth to whirlpool, and might reduce the flow of the fluid that flow into this eyelet. Thus, even at emersion wave When moving, still may correctly measure flow velocity.
Perhaps, each channel isolation has an inlet surface of extending along the vibration plane of ultrasonic transducer With the exit surface that extends along the wall of measuring flow channel. So, because ultrasonic wave can be with always The angle enters this channel isolation, and therefore along a straight line passage pass this passage and advance, therefore, can provide The ultrasonic propagation passage that does not have reflection and almost do not have to decay. In addition, because outlet is with respect to survey The smooth surface of the wall of amount flow channel is therefore at the stream along the perisphere of measuring the flow channel surface There is not disturbance in the body. In addition, because exit surface is calibrated to radiating surface, therefore spoke effectively Penetrate ultrasonic wave.
Perhaps, a corresponding channel isolation of each channel isolation of an eyelet and another eyelet Extend collinearly. So emitting surface aligns along this hyperacoustic direct of travel each other with receiving surface, Thus, can reduce by the caused reflection loss of the dividing plate in the channel isolation of relative eyelet.
Perhaps, the length on one side of the vertical section of each channel isolation is greater than being used for the ultrasonic of transmitting/receiving The half-wavelength of ripple. Therefore, the viscosity impact of this separation surfaces can be lowered, and can provide thus several The channel isolation that does not have decay.
Perhaps, the length on one side of the vertical section of each channel isolation is not ultrasonic for transmitting/receiving The integral multiple of the half-wavelength of ripple. So, can suppress horizontal resonance, realize thus propagating efficiently.
Perhaps, between the vibration plane of the channel isolation of eyelet and a corresponding ultrasonic transducer Distance is the integral multiple of hyperacoustic half-wavelength. So, can make resonance appear at the half-wave place, have thus Effective radiation may be provided.
Perhaps, the thickness of each partitioned portion of this channel isolation is less than the ultrasonic wave that is used for transmitting/receiving Wavelength. So, can prevent hyperacoustic reflection, thereby effective transmitting/receiving is provided therein.
Perhaps, this channel isolation is to form by a boxwork is installed into this eyelet. So, By adopting grid, might separate each eyelet at vertical and horizontal.
Perhaps, one of described channel isolation has an opening at the middle part of this eyelet. So, this eyelet Align with the axis of ultrasonic transducer, be convenient to thus effective reception/emission.
Perhaps, the passage length of each channel isolation is wanted than the hyperacoustic wavelength that is used for transmitting/receiving Short. So, the ultrasonic propagation passage that does not almost have decay can be provided.
Perhaps, channel isolation is by the direction peace of edge in eyelet perpendicular to the direction of ultrasonic propagation Fill a mesh members and form. So, might make logical by divide this eyelet with mesh members The length in road minimizes.
Perhaps, each channel isolation is included in certain communication means on a bit along its length direction, is used to make this channel isolation and its to be close to a channel isolation and is communicated with.So, can make by the caused decay of this dividing plate minimum.
Claims (35)
1, a kind of ultrasonic flow meter comprises: measure flow channel, measured fluid is by wherein flowing; Ultrasonic transducer is separately positioned on along measuring flow channel upstream extremity respect to one another and downstream end; Be used to make each ultrasonic transducer to be exposed to the eyelet of measuring flow channel; The propagation ducts flow conditioner is provided with along the ultrasonic propagation passage between upstream ultrasonic transducer and downstream ultrasonic transducer, and has the adjusting parts that are exposed to fluid; Measure control assembly, be used to measure the hyperacoustic travel-time between ultrasonic transducer; And calculating unit, be used for according to the calculated signals flow of measuring control assembly.
2, ultrasonic flow meter as claimed in claim 1, wherein, the propagation ducts flow conditioner is set on the upstream extremity and downstream end with respect to the ultrasonic propagation passage.
3, ultrasonic flow meter as claimed in claim 2 wherein, is set at combined together by a connector component with respect to the upstream extremity of ultrasonic propagation passage and the propagation ducts flow conditioner on the downstream end.
4, want 1 described ultrasonic flow meter as right, wherein, according to measured type of fluid, the interchannel distance of propagation ducts flow conditioner and ultrasonic propagation is changed.
5, ultrasonic flow meter as claimed in claim 1, wherein, the adjusting parts of propagation ducts flow conditioner are set to the structure of mesh members.
6, ultrasonic flow meter as claimed in claim 1, wherein, the adjusting parts of propagation ducts flow conditioner are set to the structure of net member, and its wall streamwise extends.
7, ultrasonic flow meter as claimed in claim 1, wherein, according to the cross section position along the measurement flow channel, the distance between two adjacent adjusting parts of propagation ducts flow conditioner is changed.
8, ultrasonic flow meter as claimed in claim 1 wherein, is measured flow channel and is contained rectangle along the xsect of the direction that flows perpendicular to fluid wherein.
9, ultrasonic flow meter as claimed in claim 1 wherein, is measured flow channel and is contained length breadth ratio less than 2 rectangle along the xsect of the direction that flows perpendicular to fluid wherein.
10, ultrasonic flow meter as claimed in claim 1, wherein, eyelet feeds measures flow channel, and the shape that is adopted has the limit that an edge is substantially perpendicular to the direction extension of flowing through the direction of measuring flow channel.
11, ultrasonic flow meter as claimed in claim 1 wherein, is provided with an introducing portion on the upstream extremity of measuring flow channel, it disposes the Non-Uniform Flow rejector, and this Non-Uniform Flow rejector is provided with narrow meshed access portal.
12, ultrasonic flow meter as claimed in claim 1, wherein, the export department that is arranged on the introducing portion on the upstream extremity of measuring flow channel and is arranged on the downstream end of measuring flow channel all disposes the Non-Uniform Flow rejector, and it is provided with narrow meshed access portal.
13, ultrasonic flow meter as claimed in claim 11, wherein, the cross-sectional area of this introducing portion or this export department is measured the cross-sectional area of flow channel greater than this.
14, ultrasonic flow meter as claimed in claim 12, wherein, the cross-sectional area of this introducing portion or this export department is measured the cross-sectional area of flow channel greater than this.
15, ultrasonic flow meter as claimed in claim 11, wherein, the aperture size of the access portal of Non-Uniform Flow rejector is less than the aperture size that is arranged on the access portal in the second fluid rejector.
16, ultrasonic flow meter as claimed in claim 12, wherein, the aperture size of the access portal of Non-Uniform Flow rejector is less than the aperture size that is arranged on the access portal in the second fluid rejector.
17, ultrasonic flow meter as claimed in claim 1, wherein, at least one eyelet comprises a plurality of channel isolations that extend along the ultrasonic propagation direction.
18, a kind of ultrasonic flow meter comprises: measure flow channel, measured fluid is by wherein flowing; Ultrasonic transducer is separately positioned on along measuring flow channel upstream extremity respect to one another and downstream end; Be used to make each ultrasonic transducer to be exposed to the eyelet of measuring flow channel; The propagation ducts flow conditioner is provided with along the ultrasonic propagation passage between upstream ultrasonic transducer and the downstream ultrasonic transducer, and has the adjusting parts that are exposed to fluid; The fluid rejector is used to reduce measured fluid and flows into eyelet; Measure control assembly, be used to measure the hyperacoustic travel-time between ultrasonic transducer; Calculating unit is used for according to the calculated signals flow of measuring control assembly.
19, ultrasonic flow meter as claimed in claim 18, wherein, the propagation ducts flow conditioner is set on the upstream extremity and downstream end with respect to the ultrasonic propagation passage.
20, ultrasonic flow meter as claimed in claim 19 wherein, is set at combined together by a connector component with respect to the upstream extremity of ultrasonic propagation passage and the propagation ducts flow conditioner on the downstream end.
21, ultrasonic flow meter as claimed in claim 18 wherein, is set at combined together with this fluid rejector with respect to the upstream extremity of ultrasonic propagation passage and the propagation ducts flow conditioner on the downstream end.
22, ultrasonic flow meter as claimed in claim 18, wherein, this fluid rejector is the first fluid rejector that is provided with for the downstream eyelet.
23, ultrasonic flow meter as claimed in claim 18, wherein, this fluid rejector is the first fluid rejector for downstream eyelet and the setting of upstream eyelet.
24, ultrasonic flow meter as claimed in claim 18, wherein, this fluid rejector is the second fluid rejector, obtains this second fluid rejector by provide fluid to suppress parts for the propagation ducts flow conditioner along the setting of ultrasonic propagation passage.
25, ultrasonic flow meter as claimed in claim 18, wherein, the fluid rejector is included as the first fluid rejector of eyelet setting and by provide fluid to suppress the second fluid rejector that parts obtain to the propagation ducts flow conditioner.
26, ultrasonic flow meter as claimed in claim 18, wherein, according to measured type of fluid, the interchannel distance of propagation ducts flow conditioner and ultrasonic propagation is changed.
27, ultrasonic flow meter as claimed in claim 18, wherein, the adjusting parts of propagation ducts flow conditioner are set to the structure of mesh members.
28, ultrasonic flow meter as claimed in claim 18, wherein, the adjusting parts of propagation ducts flow conditioner are set to the structure of net member, and its wall streamwise extends.
29, ultrasonic flow meter as claimed in claim 18, wherein, the change of the distance between two adjacent adjusting parts of propagation ducts flow conditioner is according to the cross section position along the measurement flow channel.
30, ultrasonic flow meter as claimed in claim 18 wherein, is measured flow channel and is contained rectangle along the xsect perpendicular to the mobile direction of fluid.
31, ultrasonic flow meter as claimed in claim 18 wherein, is measured flow channel and is contained length breadth ratio less than 2 rectangle along the xsect of the direction that flows perpendicular to fluid.
32, ultrasonic flow meter as claimed in claim 18, wherein, eyelet feeds measures flow channel, and the shape that is adopted has the limit that an edge is substantially perpendicular to the direction extension of flowing through the direction of measuring flow channel.
33, ultrasonic flow meter as claimed in claim 18 wherein, is provided with an introducing portion on the upstream extremity of measuring flow channel, it disposes the Non-Uniform Flow rejector, and this Non-Uniform Flow rejector is provided with narrow meshed access portal.
34, ultrasonic flow meter as claimed in claim 18, wherein, the export department that is arranged on the introducing portion on the upstream extremity of measuring flow channel and is arranged on the downstream end of measuring flow channel all disposes the Non-Uniform Flow rejector, and it is provided with narrow meshed access portal.
35, ultrasonic flow meter as claimed in claim 18, wherein, at least one eyelet comprises a plurality of channel isolations that extend along the ultrasonic propagation direction.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7145899 | 1999-03-17 | ||
| JP71458/1999 | 1999-03-17 | ||
| JP92560/1999 | 1999-03-31 | ||
| JP102240/1999 | 1999-04-09 | ||
| JP107878/1999 | 1999-04-15 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB008051666A Division CN100453980C (en) | 1999-03-17 | 2000-03-17 | Ultrasonic flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101424553A true CN101424553A (en) | 2009-05-06 |
Family
ID=40615308
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101833356A Expired - Fee Related CN101424552B (en) | 1999-03-17 | 2000-03-17 | Ultrasonic flow measuring instrument |
| CNA2008101833360A Pending CN101424553A (en) | 1999-03-17 | 2000-03-17 | Ultrasonic flow measuring instrument |
| CN2008101833375A Expired - Fee Related CN101424554B (en) | 1999-03-17 | 2000-03-17 | Ultrasonic flow measuring instrument |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101833356A Expired - Fee Related CN101424552B (en) | 1999-03-17 | 2000-03-17 | Ultrasonic flow measuring instrument |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101833375A Expired - Fee Related CN101424554B (en) | 1999-03-17 | 2000-03-17 | Ultrasonic flow measuring instrument |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104596600A (en) * | 2013-10-30 | 2015-05-06 | 克洛纳有限公司 | ultrasonic flowmeter |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2612113B1 (en) * | 2010-09-03 | 2016-11-16 | Los Alamos National Security LLC | Apparatus and method for visualization of particles suspended in a fluid and fluid flow patterns using ultrasound |
| CN102032932B (en) * | 2010-10-26 | 2012-09-05 | 周岳建 | Ultrasonic flowmeter |
| BR112013018520A2 (en) * | 2011-02-23 | 2016-10-18 | Miitors Aps | ultrasonic flow method |
| US9711709B2 (en) * | 2013-08-08 | 2017-07-18 | General Electric Company | Transducer systems |
| US10444051B2 (en) * | 2017-01-09 | 2019-10-15 | Georg Fischer Signet, LLC | Ultrasonic sensor assembly and method of manufacture |
| DE102017009462B4 (en) * | 2017-10-12 | 2023-01-26 | Diehl Metering Gmbh | Measuring device for determining a fluid variable |
| CN110646043A (en) * | 2019-11-04 | 2020-01-03 | 中国计量科学研究院 | Low-channel-number gas ultrasonic flow measurement method |
| CN111896062B (en) * | 2020-07-24 | 2022-09-20 | 北京瑞德联数据科技有限公司 | Ultrasonic flow measurement device, ultrasonic flow measurement equipment and storage medium |
| CN112595373B (en) * | 2020-11-24 | 2022-12-06 | 宁波水表(集团)股份有限公司 | Ultrasonic water meter design method and system |
-
2000
- 2000-03-17 CN CN2008101833356A patent/CN101424552B/en not_active Expired - Fee Related
- 2000-03-17 CN CNA2008101833360A patent/CN101424553A/en active Pending
- 2000-03-17 CN CN2008101833375A patent/CN101424554B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104596600A (en) * | 2013-10-30 | 2015-05-06 | 克洛纳有限公司 | ultrasonic flowmeter |
| CN104596600B (en) * | 2013-10-30 | 2020-07-17 | 克洛纳有限公司 | Ultrasonic flowmeter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101424554A (en) | 2009-05-06 |
| CN101424554B (en) | 2010-12-01 |
| CN101424552A (en) | 2009-05-06 |
| CN101424552B (en) | 2012-09-26 |
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