CN201600155U - Built-in rectifier of gas ultrasonic flow sensor - Google Patents
Built-in rectifier of gas ultrasonic flow sensor Download PDFInfo
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- CN201600155U CN201600155U CN201020119771XU CN201020119771U CN201600155U CN 201600155 U CN201600155 U CN 201600155U CN 201020119771X U CN201020119771X U CN 201020119771XU CN 201020119771 U CN201020119771 U CN 201020119771U CN 201600155 U CN201600155 U CN 201600155U
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Abstract
A built-in rectifier of a gas ultrasonic flow sensor is in an integral structure formed by arranging in a multiple layer manner, and fixedly connecting thin-wall rectifying tubes with a wall thickness of 0.5mm to 1mm. One end of the rectifier is horizontal while the other end is an oblique face with 45 +/- 15 degrees included angle, diameter of each rectifying tube sequentially reduces from inside out, a spacing structure is arranged between adjacent tube walls, the diameters of the rectifying tubes are no larger than one third of diameter of a mother tube of the ultrasonic sensor, and the maximum diameter of the rectifying tubes is no larger than 30mm. The built-in rectifier of a gas ultrasonic flow sensor completely improves a flow field flowing through a measured section, namely, the flow field enables an ultrasonic transducer to emit and receive ultrasonic energy in an ultrasonic wave transmission path and is in a laminar state or in a state closest to the laminar state. In use, the rectifier requires no front straight tube section additionally mounted in front, thereby greatly reducing flow chocking effect and reacting effect of pulsating flow of the front straight tube section.
Description
Technical field
The utility model relates to the built-in rectifier that is used for the gas ultrasonic flow sensor.
Background technology
Present ultrasonic flow meter generally has two ultrasonic transducers, alternately transmits and receives ultrasonic wave energy mutually.But in actual applications, owing to the influence of the length of the reason of installing, front and back straight length, upstream and downstream valve elbow etc., the flow state of medium can not be desirable, and the precision of ultrasonic flow meter and repeatability are difficult to guarantee.In addition,
1) in gaseous fluid, because the characteristic of gas, its flow field variability will be far longer than liquid.
2) under breadboard approximate ideal state, its gas flow state is also pessimistic.At present, ultrasonic flow meter is not being taked under the special rectification processing, the accuracy class of its gas ultrasonic flow meter is ± 1.5%, promptly 1.5 grades.
Just because of above-mentioned reason, existing to research and development gas ultrasonic flow meter, turn to the flow field of the measured medium of gas ultrasonic flow meter to handle just gradually.
Now, see accompanying drawing 1 by a kind of gas ultrasonic flow meter; Its method be the upstream (front) of gas ultrasonic flow flowmeter sensor C1 add one isodiametric before straight tube C2, settle a cowling panel C3 who improves fluid flow fields in the upstream port of preceding straight tube; Densely covered pod apertures C4 sees accompanying drawing 2 on the cowling panel.The flow field of the measured medium gas that the purpose of its cowling panel C3 and pod apertures C4 and effect are come the upstream is exactly put in order and water conservancy diversion, to reach the purpose of rectification, makes the flow field as far as possible near laminar condition.Its principle is with behind the turbulent gas process pod apertures C04 in the original whole pipe, be separated into a plurality of tuftlet turbulent flow gas beams, be laminar condition between bundle and the bundle, or STATIC CORRECTION USING APPROXIMATE LAYER stream mode, be similar to and do not disturb mutually, every bundle gas stream is stably mobile in certain distance, can disorderly not shake and produce situations such as whirlpool, and this is a guide functions.And the thickness of cowling panel C3 is generally 10～20mm, and thick more its helical pitch of thickness is long more, and then guide functions is obvious more, and the distance of air flow stream steady flow is long more; And the diameter of line is more little, and easy more stable, its stable required straight length is also few more.
But the shortcoming of above-mentioned existing cowling panel also is conspicuous:
One: choked flow is too big, and the bigger pressure loss is arranged.This point is to require energy-conservation principle contrary with present instrument.
Its two: the flowmeter front has added a straight length, and the user has increased place difficulty when mounted and difficulty is installed.
Its three: because any fluid is when transmission, all increase energy with to transmission at a distance, and air pump or water pump certainly will form the pulsating flow of medium when pressurization by air pump or water pump pressurization.Because the interval between the pod apertures C4 of cowling panel is big (otherwise its insufficient strength), this has played the effect of a kind of choked flow and bounce-back at interval.This reacts on the pulsating flow, can strengthen the amplitude of pulsating flow, and makes original pulsating flow become the secondary pulsation by once pulsing, even repeatedly pulsation.Thereby make pulsating flow severe more.Simultaneously, because the rectification length (being thickness) of cowling panel C3 is too short, has only 10～20mm, pulsating flow behind its water conservancy diversion has just had decay, when turbulent flow has just had stable and the transition of forward laminar flow, because rectification helical pitch (rectification length) is too short, each line bundle will be joined again, vibration influences each other mutually, forms new pulsating flow and new turbulent flow again.
Summary of the invention
In view of the shortcoming that above-mentioned prior art exists, the built-in rectifier that the utility model provides a ultrasonic flow sensor and ultrasonic flow meter to use.
The built-in rectifier of a kind of gas ultrasonic flow sensor is characterized in that, is that the thin-walled commutator tube of 0.5mm～1mm carries out multilayer and arranges and be fixedly connected into one-piece construction by tube wall, and the one end is a level, and the other end is the inclined-plane, and the inclined-plane angle is 45 degree ± 15 degree; The diameter difference of every layer of commutator tube, the diameter of commutator tube reduce outside being reached by the lining successively; It between the adjacent tube wall gap structure; The diameter of each commutator tube must not be greater than 1/3rd of the female pipe of ultrasonic sensor diameter, and the maximum gauge of each commutator tube is no more than 30mm.The quantity of commutator tube is decided according to the diameter of different ultrasonic flow sensors with diameter.
In order really to improve the flow field state of flow media, make it meet hydromechanical theory to greatest extent, the utility model is by a built-in rectifier, improve measured section this section flow field of flowing through fully, the flow field at the distance place that this section ultrasound wave that promptly will make ultrasonic transducer transmit and receive ultrasonic energy transmits is to be in laminar flow or near one section flow field of laminar condition.
Built-in rectifier is applied to ultrasonic flow meter, does not need to install preceding straight length again additional before the flowmeter, and the caliber of commutator tube can be at 0.5～1mm, and the choked flow effect that it produced and the retroaction of pulsating flow can be reduced to almost ignores.
The utility model is owing to be gapped between commutator tube and the commutator tube, and fluid can be flowed through herein, thereby has avoided the shortcoming of the prior art pressure loss and bounce-back pulsating flow, can eliminate or reduce the influence of pulsating flow effectively.The length of the commutator tube of built-in rectifier is longer, is 150mm as the shortest effective length of DN25, and the shortest effective length of DN300 is 250mm.So because its effective rectification length (helical pitch) long enough, the effect that its water conservancy diversion current stabilization is big will be better than the shortest effective length of 10mm～20mm of prior art cowling panel far away.
Description of drawings
Accompanying drawing 1 is the ultrasonic flow meter structural representation that prior art installs preceding commutator tube and cowling panel additional.
Accompanying drawing 2 is cowling panel structural representations among Fig. 1.
Accompanying drawing 3 is Fig. 2 vertical views.
Accompanying drawing 4 is the used built-in rectifier structure synoptic diagram of the utility model ultrasonic flow meter.
Accompanying drawing 5 is Fig. 4 vertical views.
Accompanying drawing 6 is the ultrasonic flow sensor structural representations that adopt the built-in rectifier of the utility model.
Accompanying drawing 7 is Fig. 6 vertical views.
Straight tube before the C1 ultrasonic flow flowmeter sensor, C2, C3 cowling panel, C4 pod apertures, H1 commutator tube, H2 back up pad, H3 gap,
The built-in rectifier of P1, the female pipe of P2 sensor, P3 upstream ultrasonic transducer, P4 downstream ultrasonic transducer.
Embodiment
The built-in rectifier of a kind of gas ultrasonic flow sensor is characterized in that, is that the thin-walled commutator tube of .5mm～1mm carries out multilayer and arranges and be fixedly connected into one-piece construction by tube wall, and the one end is a level, and the other end is the inclined-plane, and the inclined-plane angle is 45 degree ± 15 degree; The diameter difference of every layer of commutator tube, the diameter of commutator tube reduce outside being reached by the lining successively; It between the adjacent tube wall gap structure; The diameter of each commutator tube must not be greater than 1/3rd of the female pipe of ultrasonic sensor diameter, and the maximum gauge of each commutator tube is no more than 30mm.The quantity of commutator tube is decided according to different ultrasonic flow sensor diameter with diameter.For example, the female pipe of sensor diameter is the gas ultrasonic flow meter of DN100, and female bore of its sensor is φ 100mm, commutator tube can outwards be arranged 3 layers by the center, the pipe core diameter is φ 30mm (comprising pipe thickness), and the sublevel pipe is φ 20mm, and the outermost layer pipe is φ 15mm.
The short side length of commutator tube is at least 150mm.
Cross sectional shape after the described commutator tube welding is circular, and its level one side soldering is in back up pad H2.
By built-in rectifier P1, the female pipe of ultrasonic flow sensor (flanged) P2, upstream ultrasonic transducer P3, downstream ultrasonic transducer P4 etc. form ultrasonic flow sensor.Built-in rectifier P1 is installed in fluid inlet one side of the female pipe of ultrasonic flow sensor P2.The length of rectifier (the reeve degree of depth) has 10mm～15mm to be advisable with distance upstream ultrasonic transducer P3.Long, can stop the transfer route of the sound wave of ultrasonic transducer influences its hyperacoustic transmitting and receiving; Too short, can weaken the rectification effect of rectifier.
After the gas ultrasonic flow sensor was used the utility model, its advantage was 1) because commutator tube, the effect of H1, with the energy of a pulsating flow in the female pipe of original ultrasonic flow sensor, be diverted in tens even tens commutator tubes, its percent ripple energy is disperseed greatly; 2) and the length long enough of its commutator tube, and the caliber of commutator tube has only the part of the female pipe of original ultrasonic flow sensor, even 1/tens.So can in its existing length, eliminate the influence of pulsating flow fully; And turbulent flow carried out the transition to laminar condition.That is to say that the energy of the pulsating flow in each commutator tube is not when also flowing out commutator tube, just having decayed to has not had.Medium fluid in each rectifier fully all flows out and can be fashionable, has not had the existence of pulsating flow, even or also have, its energy is also very low.The fluid bundle that each commutator tube flows out will continue by inertia separately to flow, and the phase mutual interference no longer forms new turbulent flow.
And the pipeline of commutator tube is long more, and its inertial flow power is big more, and the distance that inertia flows is also long more.The caliber of commutator tube is more little, and the distance that inertia flows is also big more, even fluid has left commutator tube, and final the junction, the possibility of its phase mutual interference is also more little, but continues to flow with the state of laminar flow.
The utility model is through experiment repeatedly, and in actual measurement, linear error all reaches 1% precision, and part reaches 0.5% precision; Repeatability all reaches 0.5 grade requirement.Strengthen in the experiment of upstream turbulent flow having a mind to, the experimental result of gas ultrasonic flow meter that adds built-in rectifier is influenced hardly, and its reproducibility error is still in 0.5 grade; And the experimental result of gas ultrasonic flow meter that does not install built-in rectifier additional is very different, and its reproducibility error is about 1.5 grades; The reproducibility error of the gas ultrasonic flow meter of straight tube and cowling panel is at 1.0 grades before installing additional.So, built-in rectification type ultrasonic flow meter be advanced in theory, be feasible in actual applications.
Claims (3)
1. the built-in rectifier of gas ultrasonic flow sensor is characterized in that, is that the thin-walled commutator tube of 0.5mm～1mm carries out multilayer and arranges and be fixedly connected into one-piece construction by tube wall, and the one end is a level, and the other end is the inclined-plane, and the inclined-plane angle is 45 degree ± 15 degree; The diameter difference of every layer of commutator tube, the diameter of commutator tube reduce outside being reached by the lining successively; It between the adjacent tube wall gap structure; The diameter of each commutator tube must not be greater than 1/3rd of the female pipe of ultrasonic sensor diameter, and the maximum gauge of each commutator tube is no more than 30mm.
2. according to the built-in rectifier of the described gas ultrasonic flow sensor of claim 1, it is characterized in that the short side length of commutator tube is at least 150mm.
3. according to the built-in rectifier of the described gas ultrasonic flow sensor of claim 3, it is characterized in that the cross sectional shape after the described commutator tube welding is circular, its level one side soldering is in supporting seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020119771XU CN201600155U (en) | 2010-01-29 | 2010-01-29 | Built-in rectifier of gas ultrasonic flow sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020119771XU CN201600155U (en) | 2010-01-29 | 2010-01-29 | Built-in rectifier of gas ultrasonic flow sensor |
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| Publication Number | Publication Date |
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| CN201600155U true CN201600155U (en) | 2010-10-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201020119771XU Expired - Lifetime CN201600155U (en) | 2010-01-29 | 2010-01-29 | Built-in rectifier of gas ultrasonic flow sensor |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102032932A (en) * | 2010-10-26 | 2011-04-27 | 周岳建 | Method for enabling fluid in ultrasonic flowmeter to flow smoothly and ultrasonic flowmeter for implementing method |
| CN102141420A (en) * | 2010-01-29 | 2011-08-03 | 上海一诺仪表有限公司 | Built-in rectifier for gas ultrasonic wave flow sensor |
| CN102346057A (en) * | 2011-09-26 | 2012-02-08 | 威海市天罡仪表股份有限公司 | Conical rectifier |
| CN105784031A (en) * | 2016-02-29 | 2016-07-20 | 宁波市鹏盛科技发展有限公司 | Gas rectifying device |
| CN106979805A (en) * | 2016-01-19 | 2017-07-25 | 矢崎能源系统公司 | Gas meter |
| CN109931995A (en) * | 2019-02-01 | 2019-06-25 | 天津大学 | A method of obtaining gas ultrasonic flowmeter internal acoustic field |
| CN112136023A (en) * | 2019-03-16 | 2020-12-25 | 石油和天然气计量设备公司 | Small ultrasonic flowmeter, in particular for gases |
-
2010
- 2010-01-29 CN CN201020119771XU patent/CN201600155U/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102141420A (en) * | 2010-01-29 | 2011-08-03 | 上海一诺仪表有限公司 | Built-in rectifier for gas ultrasonic wave flow sensor |
| CN102141420B (en) * | 2010-01-29 | 2014-10-29 | 上海一诺仪表有限公司 | Built-in rectifier for gas ultrasonic wave flow sensor |
| CN102032932A (en) * | 2010-10-26 | 2011-04-27 | 周岳建 | Method for enabling fluid in ultrasonic flowmeter to flow smoothly and ultrasonic flowmeter for implementing method |
| CN102032932B (en) * | 2010-10-26 | 2012-09-05 | 周岳建 | Ultrasonic flowmeter |
| CN102346057A (en) * | 2011-09-26 | 2012-02-08 | 威海市天罡仪表股份有限公司 | Conical rectifier |
| CN106979805A (en) * | 2016-01-19 | 2017-07-25 | 矢崎能源系统公司 | Gas meter |
| CN106979805B (en) * | 2016-01-19 | 2019-09-17 | 矢崎能源系统公司 | Gas meter |
| CN105784031A (en) * | 2016-02-29 | 2016-07-20 | 宁波市鹏盛科技发展有限公司 | Gas rectifying device |
| CN105784031B (en) * | 2016-02-29 | 2019-10-15 | 浙江天信超声技术有限公司 | A kind of gas rectifying device |
| CN109931995A (en) * | 2019-02-01 | 2019-06-25 | 天津大学 | A method of obtaining gas ultrasonic flowmeter internal acoustic field |
| CN109931995B (en) * | 2019-02-01 | 2020-07-14 | 天津大学 | Method for acquiring internal sound field of gas ultrasonic flowmeter |
| CN112136023A (en) * | 2019-03-16 | 2020-12-25 | 石油和天然气计量设备公司 | Small ultrasonic flowmeter, in particular for gases |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20101006 Effective date of abandoning: 20100129 |
|
| RGAV | Abandon patent right to avoid regrant |