CN101907473A - Ultrasonic flowmeter - Google Patents

Ultrasonic flowmeter Download PDF

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Publication number
CN101907473A
CN101907473A CN 201010216780 CN201010216780A CN101907473A CN 101907473 A CN101907473 A CN 101907473A CN 201010216780 CN201010216780 CN 201010216780 CN 201010216780 A CN201010216780 A CN 201010216780A CN 101907473 A CN101907473 A CN 101907473A
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CN
China
Prior art keywords
upstream
downstream
reflecting
fluid
ultrasonic transducer
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Pending
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CN 201010216780
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Chinese (zh)
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李俊国
蔡波
廖斌
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李俊国
蔡波
廖斌
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Priority to CN 201010216780 priority Critical patent/CN101907473A/en
Publication of CN101907473A publication Critical patent/CN101907473A/en
Pending legal-status Critical Current

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Abstract

The invention discloses an ultrasonic flowmeter comprising a fluid pipeline, an upstream ultrasonic transducer and a downstream ultrasonic transducer. The upstream ultrasonic transducer and the downstream ultrasonic transducer are arranged oppositely on an inner pipe wall of the fluid pipeline by keeping a distance L and form slant angles of 50 degrees to 89 degrees with the flow in and out directions of fluid; an upstream reflecting block and a downstream reflecting block are arranged in the fluid pipeline; and the reflecting surfaces of the upstream and the downstream reflecting blocks form included angles of 30 degrees to 43 degrees with the flow in and out directions of fluid. According to required measure precision, the required distance L is determined, and then the slant angle of the upstream and the downstream ultrasonic transducers and the included theta upstream and the included theta downstream are determined so that after ultrasonic waves transmitted by the upstream and the downstream ultrasonic transducers are reflected by the reflecting surfaces of the upstream and the downstream reflecting blocks, are, transmitted to the upstream and the downstream ultrasonic transducers and are received by the upstream and the downstream ultrasonic transducers. Thus, a time difference delta t=T<->-T<+>. Both the reflecting blocks and the ultrasonic transducers are arranged on the pipe wall so that the flowing area of the fluid s is larger. Thus, the ultrasonic flowmeter of the invention is difficult to block even impurities exist so that the ultrasonic flowmeter is particularly suitable to measure the flowing quantity of the fluid with small pipe diameter and low flowing speed.

Description

A kind of device for measuring ultrasonic wave flow
Technical field
The invention belongs to the supersonic technique field, relate to a kind of device for measuring ultrasonic wave flow.
Background technology
On just carrying when ultrasound wave is propagated in the fluid that flows the information of rate of flow of fluid, therefore just can detect flow rate of fluid, thereby be converted into flow by the ultrasound wave that receives, finish the test of fluid flow.Mode according to detecting can be divided into dissimilar ultrasonic flow meters such as propagation speed differential method, Doppler method, wave beam deflection method, noise method and correlation method.
When adopting the ultrasound wave fluid flow rate to measure, speed and the direction of fluid in stream will cause ultrasonic signal signal difference to occur in the propagation of fluid, this species diversity depends on the objective physics law of rate of flow of fluid and transonic on the one hand, also depend on effective travel path that the concrete flow measurement structure of transonic is caused on the other hand, i.e. the spacing of two ultrasonic transducers on the fluid line direction.Sort signal difference can be expressed as:
In the formula (1), Δ t is the mistiming that ultrasound wave following current and adverse current are propagated, V Flow velocityBe rate of flow of fluid, L is the spacings of two ultrasonic transducers on the fluid line direction, Be the velocity of propagation of ultrasound wave in fluid.
Like this, by measuring the mistiming that ultrasound wave following current and adverse current are propagated, just can obtain rate of flow of fluid:
From formula (2) we as can be seen, the mistiming Δ tL is directly proportional with spacing, like this, and mistiming Δ usually tMeasuring accuracy determines that if spacing L is big more, mistiming Δ t is also big more, then rate of flow of fluid V Flow velocityMeasuring accuracy is high more.
Present normally used flow measurement device comprises: W type, V-type, Z type, U type.V-type and W type mean that ultrasonic signal and fluid line tube wall form an angle, signal be coupled into behind the fluid respectively through once with two secondary reflections, received by other ultrasonic transducer, ultrasonic transducer is to serving as the role who sends and accept each other, the duplexing notion of similar and communication system.And when two ultrasonic transducers directly relative at the tube wall that fluid flows, become the Z type, when two sonacs are vertical when also relative with fluid pipe walls, also claim directly to type as special case.
Above several flow measurement devices, its effective travel path is retrained by caliber, under and the situation that flow velocity is low little when caliber, measure can take place difficult.
In order to improve hyperacoustic effective route of transmission, U type flow measurement device by two relative miter angle reflectings surface, is transformed into the ultrasound wave of vertical incidence horizontal direction and reflexes to receiving end in fluid line.This scheme can prolong effective travel path of ultrasonic propagation, but at the inner reflecting surface that adds of fluid line, and is bigger for the influence of fluid flowing path as guidance mirrors, the occasion that exists of impurity for example, and system may lose efficacy.
For U type flow measurement device, as on 01 06th, 2010 Granted publication, notification number is that the Chinese invention patent instructions that CN100578162C, name are called " a kind of device for measuring ultrasonic wave flow " discloses a kind of U type flow measurement device.As shown in Figure 1, this U type flow measurement device comprises flow housing 1 and two ultrasonic wave transducer guidance sets 3 that are complementary, and wherein flow housing 1 is connected with the flow conduit (not shown).Described ultrasonic wave transducer guidance set 3 is inserted in the described flow housing 1 by the mounting hole that is provided with on the described flow housing 1, one of them ultrasonic wave transducer guidance set 3 inserts the upstream that is installed to flow housing 1, and another is installed in the downstream of flow housing 1.Ultrasonic wave transducer guidance set 3 comprises ultrasonic transducer, guidance mirrors and support, described support is inserted in the described mounting hole, upper end at described support is provided with insertion groove, described ultrasonic transducer is inserted in this insertion groove, described guidance mirrors is embedded in the opening part of described support lower end, on described support, the position corresponding with described guidance mirrors is provided with jet orifice.The ultrasonic transducer of upstream sends ultrasound wave through reflecting with fluid inflow direction upstream guidance mirrors 90 degree in angle of 45 degrees, along fluid moving phase direction together, propagate into the ultrasonic wave transducer guidance mirrors in fluid housing downstream, after flowing out direction downstream guidance mirrors 90 degree reflections in angle of 45 degrees with fluid, receive by the ultrasonic transducer in downstream, obtain like this following current time T+.The same manner, the ultrasonic transducer in downstream send ultrasound wave by the ultrasonic transducer of upstream obtain the adverse current time T-.So just obtained the mistiming Δ t
From Fig. 1 we as can be seen, although U type flow measurement device has solved the problem of the effective propagation distance of ultrasound wave, but owing to inserted ultrasonic wave transducer guidance set 3 at flow housing 1, especially the guidance mirrors of its lower end makes the fluid flowing path reduced cross-sectional, the occasion that impurity exists, easily stop up, cause the inefficacy of flow measurement device.
Summary of the invention
The objective of the invention is to overcome the technical matters that obstruction easily takes place existing U type device for measuring ultrasonic wave flow under the situation of tubule footpath, a kind of effective propagation distance of ultrasound wave that promptly can improve is provided, be not easy the device for measuring ultrasonic wave flow that stops up again.
For achieving the above object, device for measuring ultrasonic wave flow of the present invention comprises fluid line and the L that keeps at a certain distance away, the upstream and downstream ultrasonic transducer relatively installed on the fluid line inner tubal wall, it is characterized in that:
Upstream ultrasonic transducer and fluid inflow direction are the oblique installation of 50~89 degree, and downstream trip ultrasonic transducer and fluid flow out direction and be the oblique installation of 50~89 degree;
The opposite slightly to the right or left of the oblique direction unanimity of upstream and downstream ultrasonic transducer is separately installed with a reflex block in fluid line, and the reflecting surface of upstream reflex block becomes 3 to spend to the angle theta of 43 degree with the fluid inflow direction The upstream, the reflecting surface of downstream reflex block flows out direction with fluid and becomes 3 to spend to the angle theta of 43 degree The downstream
According to measuring required precision, determine desired spacing L, then, determine the angle of inclination and the angle theta of upstream and downstream ultrasonic transducer The upstream, θ The downstreamMake the reflecting surface of the ultrasound wave directive upstream reflex block that the upstream ultrasonic transducer sends, after the reflecting surface reflection through the upstream reflex block, the oblique reflecting surface that propagates into the downstream reflex block on opposite of longshore current body flow direction, then, through the reflection of the reflecting surface of downstream reflex block, propagate into the downstream ultrasonic transducer and receive, obtain the following current time T +Equally, the downstream ultrasonic transducer sends ultrasound wave, and the reflecting surface of directive downstream reflex block through the reflecting surface reflection of downstream reflex block, the reflecting surface reflection of upstream reflex block, is received by the upstream ultrasonic transducer, obtains the adverse current time T -When the fluid in the fluid line flows, T then ->T +, obtain mistiming Δ t=T --T +
In the present invention, can be by regulating the angle of inclination and the angle theta of upstream and downstream ultrasonic transducer The upstream, θ The downstream, the spacing L of adjusting upstream and downstream ultrasonic transducer, the i.e. distance of effective travel path.In theory, spacing L can be bordering on infinity.Usually the time difference measurements precision is determined, if spacing L is big more, then the flow rate of liquid measuring accuracy is high more.
In the present invention, the opposite slightly to the right or left of the oblique direction unanimity of upstream and downstream ultrasonic transducer is separately installed with a reflex block in fluid line, and the reflex block reflecting surface makes ultrasonic propagation coverage L increase, thereby measuring accuracy improves.
Simultaneously, compare with the U type flow measurement device of prior art, because reflex block and ultrasonic transducer all place tube wall, it is bigger that fluid flows through area, even the occasion that device for measuring ultrasonic wave flow of the present invention like this exists at impurity, also be difficult for stopping up, therefore, be particularly suitable for the measurement of the little and fluid flow that flow velocity is low of caliber.In addition, it is bigger that fluid flows through area, and fluid flowing path changes little, and the pressure loss is little.
Description of drawings
Fig. 1 is the sectional structure chart of a kind of instantiation of U type flow measurement device of prior art;
Fig. 2 is the sectional structure chart of a kind of embodiment of device for measuring ultrasonic wave flow of the present invention;
Embodiment
Below in conjunction with accompanying drawing best embodiment of the present invention is described, so that those skilled in the art understands the present invention better.What need point out especially is that in the following description, when perhaps the detailed description of known function and design can desalinate main contents of the present invention, these were described in here and will be left in the basket.
Embodiment
In the present embodiment, as shown in Figure 2, device for measuring ultrasonic wave flow comprises fluid line 100 and the L that keeps at a certain distance away on the fluid line inner tubal wall, the upstream and downstream ultrasonic transducer 201,202 relatively installed, upstream ultrasonic transducer 201 is the oblique installation of 50~89 degree with the fluid inflow direction, and trip ultrasonic transducer 202 in downstream flows out direction with fluid and is the oblique installation of 50~89 degree;
The opposite slightly to the right or left of upstream and downstream ultrasonic transducer 201,202 oblique direction unanimities is separately installed with a reflex block 301,302 in fluid line 100, and the reflecting surface A of upstream reflex block 301 becomes 3 to spend to the angle theta of 43 degree with the fluid inflow direction The upstream, the reflecting surface B of downstream reflex block 302 flows out direction with fluid and becomes 3 to spend to the angle theta of 43 degree The downstream
According to measuring required precision, determine desired spacing spacing L, then, determine the angle of inclination and the angle theta of upstream and downstream ultrasonic transducer 201,202 The upstream, θ The downstreamMake the reflecting surface A of the ultrasound wave directive upstream reflex block 301 that upstream ultrasonic transducer 201 sends, after the reflecting surface A reflection through upstream reflex block 301, the oblique reflecting surface B that propagates into the downstream reflex block 302 on opposite of longshore current body flow direction, then, through the reflection of the reflecting surface B of downstream reflex block 302, propagate into downstream ultrasonic transducer 202 and receive, obtain the following current time T +Equally, downstream ultrasonic transducer 202 sends ultrasound wave, the reflecting surface B of directive downstream reflex block 302, and the reflecting surface A reflection through the reflecting surface B of downstream reflex block 302 reflection, upstream reflex block 301 is received by upstream ultrasonic transducer 301, obtains the adverse current time T -When the fluid in the fluid line 100 flows, T then ->T +, obtain mistiming Δ t=T --T +
In the present invention, can be by regulating the angle of inclination and the angle theta of upstream and downstream ultrasonic transducer 201,202 The upstream, θ The downstream, the spacing L of adjusting upstream and downstream ultrasonic transducer 201,202, the i.e. distance of effective travel path.In theory, spacing L can be bordering on infinity.Usually the time difference measurements precision is determined, if spacing L is big more, then the flow rate of liquid measuring accuracy is high more.
In the present invention, the opposite slightly to the right or left of 100 upstream and downstream ultrasonic transducers, 201,202 oblique direction unanimities is separately installed with a reflex block 301,302 in fluid line, reflex block reflecting surface A, B make ultrasonic propagation coverage L increase, thereby measuring accuracy improves.
Because reflex block 301,302 and ultrasonic transducer 201,202 all place tube wall, it is bigger that fluid flows through area, even the occasion that device for measuring ultrasonic wave flow of the present invention like this exists at impurity also is difficult for stopping up
In this enforcement, in order to reduce the influence in convection cell flow field, the fluoran stream surface C of upstream reflex block 301 is the inclined-plane that longshore current body flow direction progressively raises.
Although above the illustrative embodiment of the present invention is described; so that the technician of present technique neck understands the present invention; but should be clear; the invention is not restricted to the scope of embodiment; to those skilled in the art; as long as various variations appended claim limit and the spirit and scope of the present invention determined in, these variations are conspicuous, all utilize innovation and creation that the present invention conceives all at the row of protection.

Claims (2)

1. a device for measuring ultrasonic wave flow comprises fluid line and the L that keeps at a certain distance away, the upstream and downstream ultrasonic transducer installed relatively on the fluid line inner tubal wall, it is characterized in that:
Upstream ultrasonic transducer and fluid inflow direction are the oblique installation of 50~89 degree, and downstream trip ultrasonic transducer and fluid flow out direction and be the oblique installation of 50~89 degree;
The opposite slightly to the right or left of the oblique direction unanimity of upstream and downstream ultrasonic transducer is separately installed with a reflex block in fluid line, and the reflecting surface of upstream reflex block becomes 3 to spend to the angle theta of 43 degree with the fluid inflow direction The upstream, the reflecting surface of downstream reflex block flows out direction with fluid and becomes 3 to spend to the angle theta of 43 degree The downstream
According to measuring required precision, determine desired spacing spacing L, then, determine the angle of inclination and the angle theta of upstream and downstream ultrasonic transducer The upstream, θ The downstreamMake the reflecting surface of the ultrasound wave directive upstream reflex block that the upstream ultrasonic transducer sends, after the reflecting surface reflection through the upstream reflex block, the oblique reflecting surface that propagates into the downstream reflex block on opposite of longshore current body flow direction, then, through the reflection of the reflecting surface of downstream reflex block, propagate into the downstream ultrasonic transducer and receive, obtain the following current time T +Equally, the downstream ultrasonic transducer sends ultrasound wave, and the reflecting surface of directive downstream reflex block through the reflecting surface reflection of downstream reflex block, the reflecting surface reflection of upstream reflex block, is received by the upstream ultrasonic transducer, obtains the adverse current time T -When the fluid in the fluid line flows, T then ->T +, obtain mistiming Δ t=T --T +
2. device for measuring ultrasonic wave flow according to claim 1 is characterized in that, the fluoran stream surface of described upstream reflex block is the inclined-plane that longshore current body flow direction progressively raises.
CN 201010216780 2010-07-05 2010-07-05 Ultrasonic flowmeter Pending CN101907473A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102680041A (en) * 2012-05-18 2012-09-19 史雪丽 Bulk pipe assembly structure for ultrasonic signal Z-shaped transmission
CN102778262A (en) * 2011-04-21 2012-11-14 通用电气公司 Ultrasonic coupler assembly
CN104964718A (en) * 2015-07-15 2015-10-07 成都南方电子仪表有限公司 Small flow ultrasonic flow system and measuring method
CN105424111A (en) * 2015-12-24 2016-03-23 东京计装株式会社 Ultrasonic wave metering device
CN105424110A (en) * 2015-12-24 2016-03-23 东京计装株式会社 Ultrasonic wave water meter
CN105444924A (en) * 2015-12-24 2016-03-30 清华大学 Ultrasonic heat meter
WO2017004887A1 (en) * 2015-07-03 2017-01-12 中国矿业大学 Method and apparatus for measuring time-difference-type ultrasonic flow
CN108362345A (en) * 2017-01-26 2018-08-03 株式会社基恩士 Ultrasonic flow sensor and its installation method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09287989A (en) * 1996-04-19 1997-11-04 Kaijo Corp Ultrasonic flowmeter
CN2468016Y (en) * 2001-03-20 2001-12-26 徐彦庆 Ultrasound flow-measurement sensor
CN101365927A (en) * 2005-12-06 2009-02-11 迪格梅萨股份公司 Ultrasound measuring section made from plastic and corresponding measuring method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09287989A (en) * 1996-04-19 1997-11-04 Kaijo Corp Ultrasonic flowmeter
CN2468016Y (en) * 2001-03-20 2001-12-26 徐彦庆 Ultrasound flow-measurement sensor
CN101365927A (en) * 2005-12-06 2009-02-11 迪格梅萨股份公司 Ultrasound measuring section made from plastic and corresponding measuring method

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102778262A (en) * 2011-04-21 2012-11-14 通用电气公司 Ultrasonic coupler assembly
CN102680041A (en) * 2012-05-18 2012-09-19 史雪丽 Bulk pipe assembly structure for ultrasonic signal Z-shaped transmission
WO2017004887A1 (en) * 2015-07-03 2017-01-12 中国矿业大学 Method and apparatus for measuring time-difference-type ultrasonic flow
CN104964718A (en) * 2015-07-15 2015-10-07 成都南方电子仪表有限公司 Small flow ultrasonic flow system and measuring method
CN105424111A (en) * 2015-12-24 2016-03-23 东京计装株式会社 Ultrasonic wave metering device
CN105424110A (en) * 2015-12-24 2016-03-23 东京计装株式会社 Ultrasonic wave water meter
CN105444924A (en) * 2015-12-24 2016-03-30 清华大学 Ultrasonic heat meter
CN108362345A (en) * 2017-01-26 2018-08-03 株式会社基恩士 Ultrasonic flow sensor and its installation method
CN108362345B (en) * 2017-01-26 2021-02-23 株式会社基恩士 Ultrasonic flow sensor and mounting method thereof

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