CN100402986C - Ultrasonic type fluid measuring device - Google Patents
Ultrasonic type fluid measuring device Download PDFInfo
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- CN100402986C CN100402986C CNB2004800049366A CN200480004936A CN100402986C CN 100402986 C CN100402986 C CN 100402986C CN B2004800049366 A CNB2004800049366 A CN B2004800049366A CN 200480004936 A CN200480004936 A CN 200480004936A CN 100402986 C CN100402986 C CN 100402986C
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Abstract
An ultrasonic type fluid measuring device capable of high precision fluid measurement. A fluid passageway is intermediately provided with a measuring section (1) formed with a plurality of divisional flow channels (3) through partition plates (2). Ultrasonic waves are sent into a fluid flowing through the divisional flow channels (3) through at least a pair of ultrasonic wave transmission/reception device, and ultrasonic waves are received after passing through the fluid. And on the basis of the propagation rate of the ultrasonic waves, an arithmetic-logic unit computes at least either the flow rate or the flow quantity of the fluid. Further, the measuring section (1) is provided with run-up flow channels (5, 6) leading to the divisional flow channels (3) to pre-regulate the flow of the fluid.
Description
Technical field
The ultrasonic fluid measurement instrument that the present invention relates to utilize hyperacoustic travel-time and the flow velocity or the flow of gas, water or other fluid are measured.
Background technology
Utilize hyperacoustic travel-time to measure ultrasonic fluid measurement instruments in the past such as flow, fluid passage determination part is set midway, and the flow rate of fluid that flows through this determination part is measured according to the ultrasonic propagation time between the ultrasonic signal transceiver.In addition, flow is to take advantage of in the area of section of the stream of determination part and the correction factor of regulation by the flow velocity of above-mentioned measurement to try to achieve.
The factor of maximum that can the high-acruracy survey flow etc. is the flow state at the fluid of said determination portion.In other words, the disorder of flowing at the fluid of determination part will cause the confusion in hyperacoustic propagation, therefore, be difficult to high-acruracy survey.
Thereby to open flat 9-43015 communique as the spy disclosed in the past, considers that it is rectangular rectangular-shaped that determination part is made section, simultaneously, its short brink is divided into the flat a plurality of separation streams that are parallel to long limit with the dividing plate separation.Flat separation stream makes the mobile laminar flow that becomes of fluid, that is, and and very effective aspect the steady flow of 2 dimensions.
But, by the determination part that above-mentioned flat a plurality of separation streams constitute, compare with the fluid passage that imports fluid, on Width, enlarge markedly.
Thereby the formation of employing the following stated promptly, is situated between by the connecting portion of the big taper of the width change in downstream, and determination part is connected on the fluid passage.
Thereby, existing because the connecting portion of this taper and on the flowing of fluid, produce disorderlyly, fluid mobile on whole separation stream is difficult to become evenly its result, the problem that measuring accuracy descends.
Summary of the invention
The present invention is in order to solve such problem, its purpose be to provide can the high-acruracy survey fluid the ultrasonic fluid measurement instrument that flows.
A kind of ultrasonic fluid measurement instrument is provided, that is, have: be arranged on the fluid passage of going up of the determination part of a plurality of separation streams that form by dividing plate midway, in the fluid that flows through above-mentioned separation stream, send ultrasonic signal and receive at least 1 pair of ultrasonic signal transceiver of the ultrasonic signal that passes after the fluid and according to the flow velocity of hyperacoustic travel-time Fluid Computation of propagating and at least one the calculation element in the flow by above-mentioned ultrasonic signal transceiver; Be provided with the auxiliary stream that the fluid that arrives the separation stream is carried out rectification in advance in said determination portion.
A kind of ultrasonic fluid measurement instrument is provided, that is, have: fluid passage, be independent of this fluid passage and be formed with the determination part of a plurality of separation streams, in the fluid that flows through above-mentioned separation stream, send ultrasonic signal and receive at least 1 pair of ultrasonic signal transceiver of the ultrasonic signal that passes after the fluid and according to the flow velocity of hyperacoustic travel-time Fluid Computation of propagating and at least one the calculation element in the flow by above-mentioned ultrasonic signal transceiver by dividing plate; Be provided with the auxiliary stream that the fluid that arrives the separation stream is carried out rectification in advance in said determination portion.
Description of drawings
Fig. 1 is the longitudinal diagram of the ultrasonic fluid measurement instrument of embodiments of the present invention 1.
Fig. 2 is the drawing in side sectional elevation of the ultrasonic fluid measurement instrument of embodiments of the present invention 1.
Fig. 3 is the longitudinal diagram of the ultrasonic fluid measurement instrument of embodiments of the present invention 2.
Fig. 4 is that the master of the ultrasonic fluid measurement instrument of embodiments of the present invention 3 looks longitudinal diagram.
Fig. 5 is that the master of the ultrasonic fluid measurement instrument of embodiments of the present invention 4 looks longitudinal diagram.
Fig. 6 is the drawing in side sectional elevation of the ultrasonic fluid measurement instrument of embodiments of the present invention 5.
Fig. 7 is the drawing in side sectional elevation of the ultrasonic fluid measurement instrument of embodiments of the present invention 6.
Fig. 8 is the longitudinal diagram of the ultrasonic fluid measurement instrument of embodiments of the present invention 7.
Fig. 9 is the drawing in side sectional elevation of effect that is used to illustrate the ultrasonic fluid measurement instrument of embodiments of the present invention 7.
Figure 10 is the longitudinal diagram of the ultrasonic fluid measurement instrument of embodiments of the present invention 8.
Figure 11 is the longitudinal diagram of the ultrasonic fluid measurement instrument of embodiments of the present invention 9.
Figure 12 is the longitudinal diagram of the ultrasonic fluid measurement instrument of embodiments of the present invention 10.
Figure 13 is the longitudinal diagram of the ultrasonic fluid measurement instrument of embodiments of the present invention 11.
Figure 14 is the drawing in side sectional elevation of the ultrasonic fluid measurement instrument of embodiments of the present invention 11.
Figure 15 is the longitudinal diagram of the ultrasonic fluid measurement instrument of embodiments of the present invention 12.
Figure 16 is the longitudinal diagram of determination part of the ultrasonic fluid measurement instrument of embodiments of the present invention 13.
Figure 17 is the longitudinal diagram of the ultrasonic fluid measurement instrument of embodiments of the present invention 14.
Figure 18 is the longitudinal diagram of the ultrasonic fluid measurement instrument of embodiments of the present invention 15.
Figure 19 is the longitudinal diagram of the ultrasonic fluid measurement instrument of embodiments of the present invention 16.
Figure 20 is the drawing in side sectional elevation of effect that is used to illustrate the ultrasonic fluid measurement instrument of embodiments of the present invention 16.
Figure 21 is the drawing in side sectional elevation of effect that is used to illustrate the ultrasonic fluid measurement instrument of embodiments of the present invention 17.
Figure 22 is the drawing in side sectional elevation of effect that is used to illustrate the ultrasonic fluid measurement instrument of embodiments of the present invention 18.
Figure 23 is the drawing in side sectional elevation of effect that is used to illustrate the ultrasonic fluid measurement instrument of embodiments of the present invention 19.
Embodiment
Below, embodiments of the present invention are described with reference to accompanying drawing.
And accompanying drawing is a synoptic diagram, is not each size positions of correct expression.And, frequency of ultrasonic of the present invention at 20KHz in the scope of 1MHz, preferably, 500KHz.
(embodiment 1)
As shown in Figure 1, 2, constitute at section on the middle part of determination part 1 of rectangular rectangle, separate short brink by a plurality of dividing plates 2.
Like this, formed a plurality of separation streams 3 parallel, and constituted multilayer channel 4 with these aggregates of separating stream 3 with long side.Be 4 layers of structure of expression in the present embodiment.
Each separates stream 3, so that the mobile laminar flow that becomes 2 dimensions of fluid, the shape ratio is set in accordance with regulations, and is flat.
And, in determination part 1, be formed with in the upstream side of multilayer channel 4 and downstream and have specified length and the unconverted auxiliary stream 5,6 of the area of section on fluid flow direction.
The fluid passage 7 that comprises determination part 1 has each bend 8,9, and is equipped with upstream chamber 10 and the downstream chamber 11 that together constitutes the U font with said determination portion 1.
Each front end of auxiliary stream 5,6 in the said determination portion 1 exists with bend 8, the 9 outstanding states of upstream chamber 10 and downstream chamber 11.The upstream portion that also will lean on than the upstream chamber 10 of fluid passage 7 and than downstream chamber 11 also will by under downstream portion, dispose baffle plate 12,13 respectively.
On the minor face sidewall 14,15 that is formed at determination part 1, be provided with the ultrasonic signal transceiver 16,17 that constitutes by a pair of ultrasonic oscillator, described a pair of ultrasonic oscillator is separated path 3 and is disposed towards each.Ultrasonic propagation road between acoustic signals transceiver 16 and 17 is respectively separated the mode of flow direction of the fluid of path 3 and is set with oblique crosscut.
Using the ultrasound wave that is made of porous plates such as wire netting or punch metals to penetrate material 18,19 side of separation stream 3 that is provided with the recess 14,15 of above-mentioned acoustic signals transceiver 16,17 covers, makes and do not produce difference in height on the stream wall.
And the thickness d of dividing plate 2 is made as than hyperacoustic wavelength (for example, 0.7mm) lacks (for example, 0.3mm).
In addition, to be set to the length L of fluid flow direction longer than minor face height H for auxiliary stream 5,6.
In above-mentioned formation, the fluid that flows into from a side of the fluid passage 7 of U font, flow velocity slows down and homogenized upstream chamber 10 in, and from the periphery inflow of outstanding auxiliary stream 5.Like this, mobile more even.
And, be flowing in the long auxiliary stream of flow direction 5 and then become steadily, thereby can separately flow into respectively the separating in the path 3 of multilayer channel 4 equably.That is, auxiliary stream 5, its length direction is bigger than short transverse, therefore, from flowing that the inlet of auxiliary stream 5 keeps that certain angle flows into, also changes direction in the longitudinal direction and is corrected.
Thereby fluid will flow into respectively separating in the path 3 of multilayer channel 4 equably.By ultrasound wave is propagated, can measure the travel-time that produces by flowing accurately in these respectively separate flowing uniformly in the path 3.
In addition, constitute very narrow gap (for example, from 1mm to 4mm, optimum is about 2mm) owing to separate stream 3, ultrasound wave can pass whole zone on the short transverse of path, therefore, can not be subjected to the influence of velocity flow profile and measures.
Its result, the correction factor (also being coefficient of flow) that is scaled flow value by the travel-time also can got identical value to big flow from low discharge.
And, owing to be not subjected to the influence of velocity flow profile, therefore, can not consider the kind (for example, air and city gas 13A, LP gas etc.) of fluid and correction factor is got identical value.
And, be very narrow space owing to separate stream 3, therefore, even under the situation that has produced pulsating flow, ultrasound wave also passes the irregular flow distribution of narrow path and propagates.Its result, the travel-time is the time that is subjected to the influence of this irregular pulsating flow, thereby can measure flowing of pulsating flow reliably.
And then, because shape with the upstream side symmetry is also made in the downstream of multilayer channel 4, therefore,, equally also can measure adverse current accurately even cause under the situation of adverse current producing pulsating flow.Thereby,, also can both carry out high-precision measurement to drag flow, adverse current even under pulsating flow ground situation.
For example, under the situation of gasmetry device,, also can align adverse current and carry out correct measurement even produce pulsating flow, therefore, measurement gas flow accurately.
And, also can save the auxiliary channel 13 in downstream under the situation of adverse current being unlikely to cause.
The thickness d of dividing plate 2 is set as shorter than hyperacoustic wavelength, therefore, is difficult to become the obstacle of hyperacoustic propagation, can receive the signal that sends high level.Its result, the SN of signal can receive the transmission ultrasonic signal accurately than high, thereby, can improve flow measurement precision and measure.
Side at the multilayer channel 4 that is provided with ultrasonic signal transceiver 16,17, be formed with the installation recess 14,15 that described ultrasonic signal transceiver 16,17 is installed, do not penetrate material 18,19 but have the covering of difference in height ground that ultrasound wave is set in order to be parallel to the stream wall.Thereby, penetrating material 18,19 by this ultrasound wave, can not cause because of flowing into the turbulent flow of recess 14,15.Like this, can in the wide flow range of width, carry out high-precision flow measurement, simultaneously,, also can suppress the generation of eddy current, and can carry out flow measurement accurately even produce pulsating flow.
And, under the situation that penetrates material 18,19 use wire nettings as ultrasound wave,, be set at 50 to 500 scope (, being 120 to 200 meshes) as optimum value as the size of screen cloth.Like this, the sound wave of the ultrasonic frequency of wavelength about 0.7mm is penetrated effectively, can under high sensitivity, carry out hyperacoustic signal and receive transmission, therefore, can improve the measuring accuracy of flow.
Divide the dividing plate 2 of separating stream 3 and uniformly-spaced dispose, and make 1 ultrasonic signal that is positioned at ultrasonic signal transceiver 16,17 that is positioned at central authorities receive the central authorities that send the signal area with odd number number (for example, 3).
Because the sensitivity profile of ultrasonic signal transceiver 16,17 generally is that central portion is the strongest, therefore, can make 1 in the dividing plate 2 to be positioned at the strongest part by separating sensitivity, respectively separate in the path 3 and ultrasound wave propagated into equably.
Ultrasound wave by uniform distribution receives the transmission signal, can separate path 3 respectively and carry out correct measurement, on the whole the high-acruracy survey flow each.
And, even disposed the dividing plate 2 of even number number, also can make 1 middle position that is positioned at the ultrasonic signal reception sending zone of ultrasonic signal transceiver 16,17 wherein by adjusting interval each other.Certainly, in this case, separate path 3 and must satisfy the necessary condition that fluid 2 dimensions flow.
And, hope be that dividing plate 2 usefulness non-cohesive materials that divide to separate stream 3 are carried out surface treatment.As non-cohesive material, can use fluorocarbon oil or silicone oil etc.In addition, also fluororesin can be used as dividing plate 2.And then, also fluororesin can be stacked on the dividing plate 2.Like this, can prevent that rubbish from attached in the narrow gap, can improve permanance or reliability.And then, also can not only carry out above-mentioned surface treatment to dividing plate 2, and to separating the above-mentioned surface treatment of path 3 whole implementation.Certainly, equally also can use fluororesin.
(embodiment 2)
Fig. 3 represents that tilt clapboard 2 makes the downstream become the next situation.
By such tilt clapboard 2, even fall to having rubbish etc. on the dividing plate 2, also can be by tilting and flow, the rubbish in downstream swept away and through auxiliary stream 6, and drop in the downstream chamber 11, therefore, have the effect that rubbish is difficult to pile up in multilayer channel 4.
And the formation that the subtend downstream tilts is illustrated, even but under the oblique situation of inclination upstream, also can expect effect identical when having produced situations such as pulsating flow, that is, rubbish drops to the effect of upstream chamber 10.
And, by the standing shape leading section of auxiliary stream 5, also can make the rubbish that drops to above-mentioned upstream chamber 10 be difficult to adverse current in separating stream 3, thereby, can form impurity and stop up few stream.
(embodiment 3)
Fig. 4 is illustrated in and respectively separates the embodiment 3 that carries out ultrasonic propagation in the stream 3 more well.That is, respectively piezoelectric vibrator 21 is fixed on the inner top surface of ultrasonic signal transceiver 16,17 casings 40, sound equipment matching layer 22 is fixed on the outer end face of casing 40 with method such as bonding.
And above-mentioned piezoelectric vibrator 21 is for being identical direction with the configuration direction of dividing plate 2, and separated by a plurality of slits 23 that are parallel to aforementioned barriers 2.And, since ultrasonic signal transceiver the 16, the 17th, identical formation, and therefore, a ultrasonic signal transceiver 17 to a side describes in this example.
Corresponding to dividing the dividing plate 2 of separating stream 3, be set to identical slit 23 with the number of this dividing plate 2.
Thereby, ultrasonic signal can be sent to effectively certainly and respectively separate in the stream 3, also can form highly sensitive subtend in separating the low subtend of stream 3, sensitivity in the formation of dividing plate 2.
Be made as the length roughly the same by gap, ultrasound wave can be propagated in the separation stream 3 of dividing plate 2 more reposefully with the thickness of dividing plate 2 with slit 23.
Thereby ultrasound wave can pass each thin layer with not omitting, thereby can measure the flow velocity of each layer accurately.Its result can make by the convert correction factor (also being coefficient of flow) of positive flow value of travel-time and also get identical value (for example, 1) at low discharge to big flow, thereby can have smooth performance.
In addition, by making ultrasonic propagation to the whole zone of respectively separating stream 3, measurement flow rate accurately is even, can measure accurately adverse current too under the situation of adverse current producing pulsating flow.And, can both carry out high-precision flow measurement to drag flow, adverse current.
For example, under the situation of gasmetry device,, also can align the adverse current correct measurement even produce pulsating flow, therefore, measurement gas flow accurately.
(embodiment 4)
Secondly, Fig. 5 be formed in ultrasonic signal transceiver 16,17 piezoelectric vibrator 21 slit 23 towards with the example of dividing plate 2 quadratures.The formation of other of piezoelectric vibrator 21 is identical with Fig. 4, and in addition, because ultrasonic signal transceiver 16,17 has identical formation, therefore, a ultrasonic signal transceiver 17 to a side describes in this example.
As mentioned above, by forming the slit 23 of piezoelectric vibrator 21 on perpendicular to the direction of dividing plate 2, even can carry out producing in separating stream 3 bad, also can be in other separation stream 3 with ultrasonic propagation, the measurement with high reliability.
In addition, owing to can with ultrasonic propagation in flat separation stream 3, therefore, can make coefficient of flow be similar to 1, can have in low discharge characteristic stably to the big flow.
(embodiment 5)
Fig. 6 represents to make the outstanding example of upstream side of two side direction flow directions of the upstream-side-end of dividing plate 2.In this constitutes, suppress near the both sides stream of separating stream 3, to flow into, increase the flow velocity of central portion, near the uneven mobile influence the minimizing boundary layer, thus can improve measuring accuracy.
In addition, about the both sides of the end of downstream side of dividing plate 3, make it outstanding to the downstream of flow direction, near the both sides stream of separating stream 3, flow into when also being suppressed at pulsation, increase the flow velocity of central portion, reduce near the uneven mobile influence in boundary layer, improve measuring accuracy.
(embodiment 6)
Fig. 7 represents the example in contrast to above-mentioned Fig. 6, the both sides of the upstream-side-end of dividing plate 2 is retracted into the example in the downstream of flow direction.Constitute by this, can improve permanance by near the rubbish deposition the central authorities of minimizing in separating stream 3.And, equally also the both sides of the end of downstream side of dividing plate 3 also can be retracted into the upstream side of flow direction, even when pulsation, also can reduce near the rubbish deposition the central authorities of separating stream 3, raising permanance.
(embodiment 7)
As shown in Figure 8, under situation, the dividing plate 2b of central authorities is made as longer and forwards grow than other dividing plate 2a, 2c with 3 dividing plate 2a～2c.Thus, the stream in the determination part 1 at first is divided into 2 and separates stream 3a, 3b.Secondly, short dividing plate 2a, 2c separate stream 3a, 3b with described 2 and then are divided into separation stream 3c, 3d, 3e, 3f.
In above-mentioned formation, fluid mobile homogenized in auxiliary stream 5 at first is diverted among separation stream 3a, the 3b, secondly be diverted to once more and separate among stream 3c, 3d, 3e, the 3f, and mobile respectively with laminar condition, thereafter through auxiliary stream 6, chamber 11 diffluences downstream.
Consider that now supposition is set at identical length with dividing plate 2a, 2b, 2c, and be diverted to 4 situations about separating among stream 3c, 3d, 3e, the 3f with being about to fluid.In this case, the flow rate of fluid distribution of flowing through determination part 1 is that the separation stream 3d of core, the flow velocity of 3e accelerate, have slack-off tendency at the separation stream 3c of peripheral wall portions, the flow velocity of 3f, thereby be subjected to the influence of the velocity flow profile of auxiliary stream 5 strongly.
At this, shown in Fig. 8,9, be provided with than growing and reducing to be arranged on the dividing plate 2a of peripheral wall portions, the length of 2c if will be arranged on the length of the dividing plate 2b of core, then as described below.Promptly, on the measured zone of ultrasonic signal transceiver, separate stream 3a, 3b by at first splitting into 2 between picture is from the upstream side to the downstream, next splits into 4 separation stream 3c, 3d, 3e, 3b increases stream like that in fact, makes being evenly distributed of flow rate of fluid.
According to aforesaid present embodiment, shunted owing to flow, therefore, flow velocity is homogenized respectively in 4 separation stream 3c that separated, 3d, 3e, 3f, thereby can suppress the influence that the flow rate of fluid in the auxiliary stream 5 distributes, can access high-precision ultrasonic flow meter.
In addition, owing to can carry out homogenising to velocity flow profile, therefore, can irrespectively carry out correct measurement with the kind of fluid at the wide flow region of width by using dividing plate 2a, 2b, 2b.
In the present embodiment, the zone by the measurement of ultrasonic signal transceiver in the determination part 1 is recorded and narrated, but also can be changed the quantity of separation stream in addition by change the length of dividing plate 2a, 2b, 2c in the downstream.In this case, also even even as pulsating flow, produce flowing of adverse current at the flow velocity of the pulsating flow in downstream, therefore, and can correct measurement, therefore as preferred.
And, in the present embodiment, be divided into 4 at last by 3 dividing plate 2a, 2b, 2c and separate stream 3c, 3d, 3e, 3f, but the quantity that changes dividing plate increases or reduce its separation stream, also can obtain identical effect.
In addition, increasing or reducing under the situation of separating stream, preferably, obtaining even flow, to increase the number of dividing plate for the dividing plate symmetrical manner of the core that is arranged on stream for distributing to flow.
And then, it is desirable for stream from the upstream side to the downstream, increase the separation stream interimly, and the area of section of the separation stream in per stage equated, equally distribute thus and flow.
(embodiment 8)
In the present embodiment, as shown in figure 10, the stream in the determination part 1 is divided into 6 with 5 dividing plate 2d, 2e, 2f, 2g, 2h separates stream 3g, 3h, 3i, 3j, 3k, 3m.
And, be provided with longlyer by 3 dividing plate 2e, 2f, 2g than other dividing plate 2d, the 2h in the outside with central portion, the length setting that 2 of central authorities are separated stream 3i, 3j be that other separation stream 3g, 3h, 3k, the 3m than the outside grows.
Constitute by this, because separation stream 3i, the 3j of core are longer than other separation stream 3g, 3h, 3k, 3m, so the resistance the when resistance ratios when fluid flows through separation stream 3i, 3j flows through other separation stream 3g, 3h, 3k, 3m is big.
Its result, the flow velocity of the separation stream 3g of the part that separation stream 3i, the 3j of the part that flow velocity is big and flow velocity are little, 3h, 3k, 3m is with homogenising.
And, as long as the quantity of separating stream corresponding to velocity flow profile, just can not be restricted, in addition, generally be to change with the length variations of separating stream interimly.
(embodiment 9)
Present embodiment, as shown in figure 11, the stream of determination part 1 is divided into 6 by 5 dividing plate 2i, 2j, 2k, 2m, 2n of equal length separates stream 3n, 3o, 3p, 3q, 3r, 3s, in addition, these are separated the expansion laterally from central division interimly of stream areas of section.
The variation of separating the described area of section of stream 3n～3s is by adjusting realizing in abutting connection with the interval of dividing plate 2i～2n.
According to the mode of above present embodiment, the area of section of the separating stream 3n～3s core from stream is enlarged laterally.Its result, even the flow velocity of core side is fast in auxiliary stream 5, also owing to set the area of section (that is, being equivalent to fluid resistance) of corresponding separation stream 3n～3s therewith, therefore, it is even that each separates the flow velocity of stream 3n～3s.
And, owing to can make the flow velocity in each separation stream 3n～3s even, therefore, can measure flow accurately.
And each separates the area of section of stream 3n～3s, as shown in figure 12, also can realize by the thickness that changes dividing plate 2o, 2p, 2q.
(embodiment 10)
In the present embodiment, as shown in figure 12, have 4 and separate stream 3t, 3u, 3v, 3w, can change the thickness of dividing plate 2o, 2p, 2q.
And in the present embodiment, though enlarge the area of section laterally from the core of determination part 1 interimly, importantly, so long as corresponding to the velocity distribution in the auxiliary stream, the change method of the area of section is just unrestricted.
In addition, also can corresponding velocity flow profile change the area of section and the length of separating stream simultaneously.That is, also the length of the separation stream of part that can flow rate of fluid is big is arranged to longlyer than other the length of separation stream, and its area is arranged to littler than other the area of section of separation stream.
For the variation of the area of section and the length variations of separation stream, generally be to change by making at least one side present stage.And then, in stream, also can accompany or follow the stream of the stream of the big part of flow rate of fluid to the little part of flow velocity, stage is reduced its length and interim its area of section that enlarges.
(embodiment 11)
In the present embodiment, as Figure 13, shown in Figure 14, the determination part 1 that will have multilayer channel 4 is independent of fluid passage 7 and other formation.
That is, separate stream 3a～3d for 4 that constitute multilayer channel 4, divide with 3 dividing plate 2a～2c, in addition, determination part 1 is formed the rectangular shape that section is rectangle, and has opening 24,25 on the wall of short brink.
On the other hand, ultrasonic signal transceiver 16,17 is configured in fluid passage 7 one sides that are inserted with said determination portion 1.Thereby minor face one side in the subtend of fluid passage 7 is formed with the recess 14,15 that is used to dispose ultrasonic signal transceiver 16,17.
When being arranged on determination part 1 in the fluid passage 7, the position consistency of the position of recess 14,15 and opening 24,25, and be situated between by these openings 24,25 ultrasonic wave propagation path to be set in and respectively separate in the stream 3.
Covering is provided with the ultrasound wave that is made of porous plates such as wire netting or punch metals and penetrates material 18,19 on described opening 24,25, fluid is not flowed in the recess 14,15 (and expression is to have represented the situation relative with the ultrasonic signal transceiver 16 of upstream side in the drawings) mussily.
Ultrasonic propagation time between the ultrasonic signal transceiver 16,17 is measured by measuring and controlling 26, and calculation element 20 with its result as the basis, as required this flow velocity is come calculated flow rate as the basis again.These measuring and controlling 26, calculation element 20 etc. are driven by battery supplies such as lithium battery (supply unit) 27.
In addition, in the inflow side of fluid passage 7, be connected with the valve body 28 of when earthquake etc. takes place, closing.And the drive division 29 of valve body 28, measuring and controlling 26, calculation element 20 etc. are configured in by the stream that constitutes the U font and constitute the position that material surrounds, and constitute densification on the whole.
Ultrasonic wave propagation path between the ultrasonic signal transceiver 16,17 and central dividing plate 2b subtend, main subtend is in 2 separation stream 3b, 3c of contiguous center.
Below, to the flow measurement action of above-mentioned formation narration fluid.
At first, press the downbeam that flows with ultrasonic signal transceiver 16, and produce ultrasound wave in the mode of oblique crosscut from upstream side.
This ultrasound wave is propagated with velocity of sound in the flowing of fluid, and detected and convert electric signal on the ultrasonic signal transceiver 17 in downstream.And, with the amplifier of measuring and controlling 26 this electric signal is amplified, and compare with comparer and reference signal and detect the ultrasonic signal of receiving.
The variation of this comparison signal is sent to repetition portion, is situated between to send signal at trigger once more by delay portion.
The number of times that this multiplicity is set with the number of times configuration part finishes.
Timing portion resets timer when sending initial flop signal, and Measuring Time when multiplicity finishes till.
Send end if be from upstream to the ultrasonic signal in downstream, then switch the direction that sends signal by switching part.
From the ultrasonic signal transceiver 17 in downstream upstream side ultrasonic signal transceiver 16, promptly upstream send signal from the downstream, and send signal as described above repeatedly, and calculate this time.Calculate flow velocity by the time that is from upstream to the downstream with from mistiming of swimming over to the upstream down by calculating formulas such as travel-time differences reciprocal at calculation element 20, or calculate flow as required.
Yet, as mentioned above, because therefore determination part 1, can carry out the processing of determination part 1 separately for being independent of the other formation of fluid passage 7.And, owing to obtain high-precision determination part easily, therefore, also situation such as corresponding specification change reliably.
Secondly, the mode of convection cell inflow determination part 1 describes.Fluid arrives upstream chamber 10 passing valve body 28 back, afterwards at the auxiliary channel 5 of determination part 1 by rectification, and flow into and separate among stream 3a～3d.
Thereby, because fluid is stable and mobile equably in separating stream 3a～3d, therefore, need not in the whole zone of separating stream 3a～3d by measuring, mainly to the separation stream 3b adjacent to each other of central authorities, the purpose that 3c carries out just reaching the initial stage by 16,17 pairs of flow velocitys of ultrasonic signal transceiver.
In addition, each height setting of separation stream 3b, 3c adjacent to each other of central authorities that becomes measuring object to the major general is in the scope of boundary layer region, thereby measuring accuracy is not subjected to the influence of external factor.
Generally, be that the boundary layer of a dividing plate is 15mm under the situation of gas such as combustion gas at the object fluid, thereby if desire to be arranged in the scope of boundary layer region, each that then will separate stream 3b, 3c is made as 30mm highly respectively and get final product with interior.
(embodiment 12)
In the present embodiment, make the fluid of separating in stream 3a～3d flow for good.Thereby as shown in figure 15, with the length of dividing plate 2a～2c, promptly the length of separating stream 3a～3d is made as that to send the length W of receiving area roughly consistent with the ultrasound wave of ultrasonic signal transceiver 16,17.
Like this, can be with the length of dividing plate 2a～2c, the length of promptly separating stream 3a～3d is made as required bottom line, can reduce the flowing pressure loss of its minute fluid.
(embodiment 13)
In the present embodiment, as shown in figure 16, form the both ends open edge of determination part 1 circular-arc or tapered such as cone-shaped.Like this, when fluid flows into determination part 1, fluid is flowed smoothly, whirlpool etc. does not take place.
Certainly, if the end of dividing plate 3a～3c is also formed same tapered, then can expect further effect.
Secondly, expression is arranged on the opening part of determination part 1 with rectification part, and flows into the example that it is improved aspect inner at fluid.
(embodiment 14)
In the present embodiment, as shown in figure 17, be provided with mesh members 30,31 such as wire netting at the opening part of determination part 1.
Constitute according to this, even the mobile of upstream side is disorderly state, also can be in mesh members 30 by rectification, and arrive the auxiliary stream 5 of determination part 1 and then further rectification in this auxiliary stream 5 again with stable flow state.
(embodiment 15)
In the present embodiment, as shown in figure 18, use cellular porous body 32,33 as rectification part.Beyond any doubt, can access the action effect identical with embodiment 14.
And, in embodiment 14 and 15, implemented when adverse current fluid also to the countermeasure of determination part 1 steady flow.If the generation adverse current is then only implemented the flow countermeasure of stabilization of fluid to the upstream side of determination part 1.
(embodiment 16)
In the present embodiment, shown in Figure 19 and 20, in a side's of determination part 1 minor face wall portion, keep the arranged spaced of regulation on the flow direction of fluid to a pair of ultrasonic signal transceiver 16,17 of major general.
More particularly, measuring and controlling 26 is received between ultrasonic signal transceiver 16,17 mutually send ultrasonic signal, flowing of convection cell keeps certain intervals to calculate forward poor with reverse ultrasonic propagation time, and as travel-time difference signal output.
Travel-time difference signal from measuring and controlling 26 is imported in the calculation element 20, and according to travel-time calculating flow velocity, calculated flow rate as required.
In this example, ultrasonic signal transceiver 16,17 can be arranged on the wall of the same side, again, compare that ultrasonic signal transceiver 16,17 is clamped stream and situation that subtend ground is installed, can elongate ultrasonic propagation path length.
Its result can improve the degree of freedom of the size of angle that ultrasonic signal transceiver 16,17 is installed or flow path width, can constitute the superior flow measurement device of setting property.
(embodiment 17)
In the present embodiment, as shown in figure 21,, constitute with ultrasound wave absorption piece 34 (for example, the surface has the resin in many trickle holes) with the stream wall of the installation side of ultrasonic signal transceiver 16,17.Like this, the hyperacoustic composition that is sent by the ultrasonic signal transceiver of signal transmitter side directly passes near wall and the wall and does not reflect, thereby can suppress the reception of non-standard ultrasonic signal.
Thereby,, can improve the mensuration precision because therefore the main reflection wave that has passed through to separate the propagation road in the stream that receives, can receive the few signal of clutter.
(embodiment 18)
In the present embodiment, as shown in figure 22, the high material of the reflectivity of sound wave, for example is set on the hyperacoustic reflecting surface in the ultrasonic propagation road, the ultrasonic reflections parts 35 that constitute by the sheet metal of finally making minute surface.Like this, can reduce ultrasound wave in the decay of reflex time or at random, thereby ultrasound wave can there be effect spread, be reduced in the clutter composition that ultrasonic signal receives, further high-precision measuring.
(embodiment 19)
In embodiment 18, the V-arrangement travel path of the reflection in ultrasonic wave propagation path 1 time is illustrated.In the present embodiment, as shown in figure 23, travel path is set as W type travel path the wall of subtend reflection 2 times.Have the effect identical, and can use with embodiment 18.Beyond any doubt, even in this case, also ultrasonic reflections parts 35 can be set on hyperacoustic reflecting surface.
And, in embodiment 16～19, the formation of determination part 1, promptly separate stream and thereon the downstream Therefore, omited is set on this point of auxiliary stream with example is identical the preceding.
And then beyond any doubt, a lot of examples of recording and narrating in each embodiment can be separately or are made up mutually and implement.
At determination part of the present invention, the auxiliary stream that in advance fluid that arrives the separation stream is carried out rectification is set.
Like this, the fluid of measuring object after auxiliary stream rectification, flow to equably and separates in the stream, and its result does not produce uneven phenomenon in ultrasonic propagation.
Be independent of fluid passage if determination part constituted, then can easily produce the complicated stream of a plurality of separation streams of separating by dividing plate, but also can improve dimensional accuracy.
Auxiliary stream is set as has certain section on the flow direction of fluid, it is rectangular rectangular-shaped preferably determination part being made section, is made as H at the height with minor face, in the time of will assisting the length of the flow direction of stream to be made as L, is set at L＞H.
For making ultrasound wave propagate into the separation stream well, with the value of thickness setting for lacking of dividing plate than the hyperacoustic wavelength that sends by the ultrasonic signal transceiver.In addition, about the setting of dividing plate, if, then can suppress the accumulation of rubbish etc. to either party inclination in its upstream side or downstream.
If with 1 in many dividing plates central authorities that place the ultrasonic signal sending zone of ultrasonic signal transceiver, then with this central baffle as basic point, dispose a plurality of separation streams symmetrically, thereby can realize the homogenising of fluid measurement.Specifically, preferably dividing plate is made as odd number and opens, 1 dividing plate that will be positioned at central portion places the central authorities of ultrasonic signal sending zone.
If will assist stream to place the upstream chamber of fluid passage highlightedly, then fluid is the circuitous state that flows and flows into auxiliary stream.
Thereby, even the entrance side bending of fluid passage, with above-mentioned circuitous flowing, mobile be partial to become to grade corrected, arrive auxiliary stream afterwards.
Carry out surface treatment if will separate at least a portion road surface of stream with non-cohesive material, can prevent suitably that then rubbish etc. from adhering to.
If desire covers a side of the separation stream at the position be provided with the ultrasonic signal transceiver with porous plate, the turbulent flow of then separating in the stream disappears, thereby can further improve the ultrasonic measurement precision.The porous plate that also can replace uses the wire netting of 50～500 meshes.
If it is homogenized to flow into the fluid of respectively separating stream, then need not the object of whole separation stream as ultrasonic measurement, also can separate stream and send ultrasonic signal to a part wherein, be received in the ultrasonic signal after propagating in the fluid.
In addition, the ultrasonic signal transceiver has the piezoelectric vibrator that is provided with a plurality of slits, and above-mentioned slit is set to towards the direction parallel with described dividing plate.Thus, can effectively carry out hyperacoustic propagation.
And then, if the slit of above-mentioned piezoelectric vibrator is set at the direction that is orthogonal to dividing plate, then can be on a plurality of separation streams propagate ultrasound waves equably.
In order to suppress to flow near the both sides stream of separating stream, and the flow velocity of raising central portion, reduce near the influence of the uneven mobile generation in boundary layer, thereby raising measuring accuracy, the quantity that can consider separation stream that will be from the upstream side to the downstream increases for example interimly, or change the length or the area of section of respectively separating stream, or change the thickness of dividing plate.And then, also can change the length and the area of section of separating stream.
Can consider that configuration position with the ultrasonic signal transceiver is configured in makes the ultrasonic signal transceiver relatively to portion, so that the mode that makes ultrasound wave separate stream with oblique crosscut is propagated, or the ultrasonic signal transceiver is configured in the same side, make ultrasound wave separate the mode propagate ultrasound waves of stream with oblique crosscut in the reflection of subtend face.In hyperacoustic reflection,, then can improve ultrasonic propagation efficient if the ultrasonic reflections parts are set in reflective wall.
The interval of selected dividing plate makes the separation stream become boundary layer region.In addition, be set at the length that sends the receiving area corresponding to the ultrasound wave of ultrasonic signal transceiver with separating stream.
Be set at the section shape of tapered by Lu Bi end, can reduce the resistance to flow of fluid the auxiliary stream of determination part.
And then by open-ended rectification mechanism, for example mesh members or the porous body of being provided with at the auxiliary stream of determination part, further stabilized fluid flows.
(industrial utilizability)
Ultrasonic fluid measurement instrument of the present invention can use gaseous fluid, water in combustion gas etc. Or in the measurement of rate of flow of the liquid fluid of wet goods or the flow measurement etc. In addition, also can identify fluid Kind.
Claims (60)
1. ultrasonic fluid measurement instrument is characterized in that having:
Fluid passage, the determination part that is provided with a plurality of separation streams that form by dividing plate midway of this fluid passage;
At least 1 pair of ultrasonic signal transceiver, it sends ultrasonic signal and receives and passes fluid ultrasonic signal afterwards in the fluid that flows through described separation stream; With
The calculation element of at least one, it is according to the flow velocity and the flow of hyperacoustic travel-time Fluid Computation of being propagated by described ultrasonic signal transceiver, wherein,
Be provided with the auxiliary stream that the fluid that arrives described separation stream is carried out rectification in advance at described determination part,
Described determination part is that section is rectangular rectangular-shaped, is made as H at the height with its minor face, when the length of assisting the flow direction of stream is made as L, is set at L＞H.
2. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, makes described auxiliary stream have certain section on the flow direction of fluid.
3. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, is than the short value of being propagated by described ultrasonic signal transceiver of hyperacoustic length with the thickness setting of described dividing plate.
4. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, described dividing plate is set to favour either party of upstream side or downstream.
5. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, makes 1 central authorities that are positioned at the ultrasonic signal sending zone of described ultrasonic signal transceiver in many described dividing plates.
6. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, described dividing plate disposes odd number and opens, and makes 1 dividing plate that is positioned at central portion be positioned at the central authorities of the ultrasonic signal sending zone of described ultrasonic signal transceiver.
7. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, surface treatment is carried out with non-cohesive material at least a portion road surface of described separation stream.
8. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, the described separation stream side that is provided with the position of described ultrasonic signal transceiver is covered with porous plate.
9. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, the described separation stream side that is provided with the position of described ultrasonic signal transceiver is covered with the wire netting of 50～500 meshes.
10. ultrasonic fluid measurement instrument according to claim 1, it is characterized in that a part of stream that also is provided with in a plurality of described separation streams sends ultrasonic signal and is received at least 1 pair of ultrasonic signal transceiver propagating ultrasonic signal afterwards in the fluid.
11. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, described ultrasonic signal transceiver has the piezoelectric vibrator that is provided with a plurality of slits, and described slit is set to towards the direction parallel with described dividing plate.
12. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, described ultrasonic signal transceiver has the piezoelectric vibrator that is provided with a plurality of slits, and described slit is set to the direction with described dividing plate quadrature.
13. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, makes the upstream side of flow direction of end two side direction fluids of described dividing plate outstanding.
14. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, makes the downstream retraction of the end two side direction flow directions of described dividing plate.
15. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, with the end formation tapered section of described dividing plate.
16. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, with the upstream side downstream side increase of quantity from measuring stream of described separation stream.
17. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, the quantity of described separation stream is increased from the upstream side to the downstream, and be made as the area of section of the described separation stream in each stage equal interimly.
18. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, the length of described separation stream is set according to the flow rate of fluid distribution of measuring stream.
19. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, the area of section of described separation stream is distributed according to the flow rate of fluid of measuring stream to be changed.
20. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, by changing the thickness of described dividing plate, can distribute according to the flow rate of fluid of measuring stream changes the area of section of described separation stream.
21. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, according to the flow rate of fluid distribution of measuring stream the length of described separation stream and the area of section is changed.
22. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, described ultrasonic signal transceiver is configured in relatively to portion, makes the described separation stream of the oblique crosscut of ultrasound wave and propagates.
23. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, described ultrasonic signal transceiver is configured in the same side, ultrasound wave is reflected and the described separation stream of oblique crosscut is propagated on the subtend face.
24. ultrasonic fluid measurement instrument according to claim 1, it is characterized in that, described ultrasonic signal transceiver is configured in the same side, ultrasound wave is reflected and the described separation stream of oblique crosscut is propagated on the subtend face, and on the wall of ultrasonic reflections, the ultrasonic reflections parts are set.
25. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, the interval of selected described dividing plate makes described separation stream become boundary layer region.
26. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, described separation stream is set at the length that sends the receiving area corresponding to the ultrasound wave of described ultrasonic signal transceiver.
27. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, the Lu Bi end of the described auxiliary stream of described determination part is set at the shape that its section is taper.
28. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, at the open-ended place of the described auxiliary stream of described determination part rectification part is set.
29. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, at the open-ended place of the auxiliary stream of described determination part the rectification part that is made of mesh members is set.
30. ultrasonic fluid measurement instrument according to claim 1 is characterized in that, at the open-ended place of the auxiliary stream of described determination part the rectification part that is made of porous body is set.
31. a ultrasonic fluid measurement instrument is characterized in that having:
Fluid passage;
Determination part, it is independent of described fluid passage and is formed with a plurality of separation streams by dividing plate;
At least 1 pair of ultrasonic signal transceiver, it sends ultrasonic signal and receives and passes fluid ultrasonic signal afterwards in the fluid that flows through described separation stream; With
The calculation element of at least one, it is according to the flow velocity and the flow of hyperacoustic travel-time Fluid Computation of being propagated by described ultrasonic signal transceiver, wherein,
Be provided with the auxiliary stream that the fluid that arrives described separation stream is carried out rectification in advance at described determination part,
Described determination part is that section is rectangular rectangular-shaped, is made as H at the height with its minor face, when the length of assisting the flow direction of stream is made as L, is set at L＞H.
32. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, makes described auxiliary stream have certain section on the flow direction of fluid.
33. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, is than the short value of being propagated by described ultrasonic signal transceiver of hyperacoustic length with the thickness setting of described dividing plate.
34. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, described dividing plate is set to favour either party of upstream side or downstream.
35. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, makes 1 central authorities that are positioned at the ultrasonic signal sending zone of described ultrasonic signal transceiver in many described dividing plates.
36. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, described dividing plate disposes odd number and opens, and makes 1 dividing plate that is positioned at central portion be positioned at the central authorities of the ultrasonic signal sending zone of described ultrasonic signal transceiver.
37. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, surface treatment is carried out with non-cohesive material at least a portion road surface of described separation stream.
38. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, the described separation stream side that is provided with the position of described ultrasonic signal transceiver is covered with porous plate.
39. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, the described separation stream side that is provided with the position of described ultrasonic signal transceiver is covered with the wire netting of 50～500 meshes.
40. ultrasonic fluid measurement instrument according to claim 31, it is characterized in that a part of stream that also is provided with in a plurality of described separation streams sends ultrasonic signal and is received at least 1 pair of ultrasonic signal transceiver propagating ultrasonic signal afterwards in the fluid.
41. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, described ultrasonic signal transceiver has the piezoelectric vibrator that is provided with a plurality of slits, and described slit is set to towards the direction parallel with described dividing plate.
42. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, described ultrasonic signal transceiver has the piezoelectric vibrator that is provided with a plurality of slits, and described slit is set to the direction with described dividing plate quadrature.
43. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, makes the upstream side of flow direction of end two side direction fluids of described dividing plate outstanding.
44. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, makes the downstream retraction of the end two side direction flow directions of described dividing plate.
45. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, with the end formation tapered section of described dividing plate.
46. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, with the upstream side downstream side increase of quantity from measuring stream of described separation stream.
47. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, the quantity of described separation stream is increased from the upstream side to the downstream, and be made as the area of section of the described separation stream in each stage equal interimly.
48. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, the length of described separation stream is set according to the flow rate of fluid distribution of measuring stream.
49. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, the area of section of described separation stream is distributed according to the flow rate of fluid of measuring stream to be changed.
50. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, by changing the thickness of described dividing plate, can distribute according to the flow rate of fluid of measuring stream changes the area of section of described separation stream.
51. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, according to the flow rate of fluid distribution of measuring stream the length of described separation stream and the area of section is changed.
52. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, described ultrasonic signal transceiver is configured in relatively to portion, makes the described separation stream of the oblique crosscut of ultrasound wave and propagates.
53. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, described ultrasonic signal transceiver is configured in the same side, ultrasound wave is reflected and the described separation stream of oblique crosscut is propagated on the subtend face.
54. ultrasonic fluid measurement instrument according to claim 31, it is characterized in that, described ultrasonic signal transceiver is configured in the same side, ultrasound wave is reflected and the described separation stream of oblique crosscut is propagated on the subtend face, and on the wall of ultrasonic reflections, the ultrasonic reflections parts are set.
55. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, the interval of selected described dividing plate makes described separation stream become boundary layer region.
56. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, described separation stream is set at the length that sends the receiving area corresponding to the ultrasound wave of described ultrasonic signal transceiver.
57. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, the Lu Bi end of the described auxiliary stream of described determination part is set at the shape that its section is taper.
58. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, at the open-ended place of the described auxiliary stream of described determination part rectification part is set.
59. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, at the open-ended place of the auxiliary stream of described determination part the rectification part that is made of mesh members is set.
60. ultrasonic fluid measurement instrument according to claim 31 is characterized in that, at the open-ended place of the auxiliary stream of described determination part the rectification part that is made of porous body is set.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP045616/2003 | 2003-02-24 | ||
| JP2003045616A JP4186645B2 (en) | 2003-02-24 | 2003-02-24 | Ultrasonic flow measuring device |
| JP071395/2003 | 2003-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101093243A Division CN101294833B (en) | 2003-02-24 | 2004-02-24 | Ultrasonic fluid measurement instrument |
Publications (2)
| Publication Number | Publication Date |
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| CN1754085A CN1754085A (en) | 2006-03-29 |
| CN100402986C true CN100402986C (en) | 2008-07-16 |
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| CN2008101093243A Expired - Fee Related CN101294833B (en) | 2003-02-24 | 2004-02-24 | Ultrasonic fluid measurement instrument |
| CNB2004800049366A Expired - Fee Related CN100402986C (en) | 2003-02-24 | 2004-02-24 | Ultrasonic type fluid measuring device |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008101093243A Expired - Fee Related CN101294833B (en) | 2003-02-24 | 2004-02-24 | Ultrasonic fluid measurement instrument |
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| JP (1) | JP4186645B2 (en) |
| CN (2) | CN101294833B (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN101294833A (en) | 2008-10-29 |
| JP4186645B2 (en) | 2008-11-26 |
| JP2004264064A (en) | 2004-09-24 |
| CN1754085A (en) | 2006-03-29 |
| CN101294833B (en) | 2011-09-21 |
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