CN1936506A - Small section branch-flow measuring method for large-diameter gas flow and apparatus thereof - Google Patents
Small section branch-flow measuring method for large-diameter gas flow and apparatus thereof Download PDFInfo
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Abstract
This invention relates to a test method for small sections of large caliber gas flows and an informed structure of the device including the following measurement steps: a, shunting in proportion, b, testing the shunt flow, c, converting the flow, in which, a shunt pipe is set in the channel of a ventilation pipeline of small aperture and parallel to the pipeline, one end of a sensor frame passes through the wall of the shunt tube and a sensor is fixed at the end connected with a measurement meter and a shunt device shunting in proportion is set at an end of the shunt tube. Advantage: taking part of sections with stable fluid in a large aperture pipeline as the sample for test and the test is accurate.
Description
Technical field
The present invention relates to the gas flow detection range, especially relate to a kind of small bore diversion measurement methods of heavy caliber gas flow and the structural improvement of device.
Background technology
When the flow of fluids such as gas, liquid is big or small in detecting pipeline, normally flow sensor is configured in the stream, and multiply by the size that the stream cross-sectional area calculates flow by the flow velocity that this flow sensor records.In the less occasion of bore, because the fluidised form of fluid is better, the precision of its measurement is relatively also higher.But in case said method is applied to bigbore occasion, the error of measurement will obviously increase.Its reason is, in the big pipeline of bore, the fluidised form of fluid can change, and is easy to generate complicated fluidised form situations such as eddy current, turbulent flow, and velocity flow profile is asymmetric, and will there be error in the value measured of flow sensor like this, thereby influences final measurement data.
For this reason, people by adopt increasing flow sensor quantity or method such as rectifier is set, reduce the influence of turbulent flow as far as possible.But, also very high to the requirement of rectifier though rectifier can be adjusted fluidised form to a certain extent measuring the bigger occasion of bore, could eliminate turbulent flow when the length of rectifier is very long; But the rectifier manufacture difficulty that length is long is quite big, and cost is also very high.Adopt in the scheme of a plurality of flow sensors formations, when producing in the flowing of fluid because of the existence of one of them flow sensor when turbulent, this turbulent flow might make a big impact to the mensuration precision of another flow sensor, therefore is difficult on the wide flow measurement scope and measures flow accurately.Also the someone adopts in the periphery of pipeline the bypass duct measurement flow rate is set, and still, the pipeline configuration of this scheme is comparatively complicated, and pipeline is difficult to arrange; On the other hand, in whole large diameter pipeline, the rate of flow of fluid of axis part can reflect the flow velocity of whole pipe more truly, is subjected to the interference of turbulent flow also less, and bypass duct is inaccurate to the traffic sampling in the whole large diameter pipeline, can not reflect ducted rate of flow of fluid truly.Therefore, this scheme effect in specific implementation process is also undesirable.
Chinese patent literature discloses a kind of big flow measurement device (application number: 200420108275) it is characterized in that: be the split road of being made up of a plurality of measurement passages that two ends link to each other with the cigarette air channel, each measurement passage is linked to each other successively by rectification section, compression section, measuring section and divergent segment and constitutes, be provided with the pressure dispatch tube in the measuring section and accept the total head and the static pressure of measuring section, the pressure dispatch tube links to each other with pressure difference transmitter; Obtain the dynamic pressure value of measuring section, again calculated flow rate.The somebody has applied for the patent that can accurately measure the flowmeter of flow on wide flow range by name (application number: 98812252), low discharge is set with measured zone and flow measured zone greatly in the stream of pipe arrangement.With in the measured zone, the rectification filtrator that stream is divided into a plurality of little streams and the stream of gas is carried out rectification is set at low discharge.Each mean flow rate of gas that flows through a plurality of little streams respectively is equal substantially.The part of gas arrives at the nozzle of low discharge with the vertical setting in both sides of flow sensor, quickens by means of the effect of this nozzle.The low discharge low discharge flow sensor of measured zone, on the low discharge section, output with by little stream and by the corresponding signal of flow velocity of the gas after the nozzle acceleration, the big flow big flow flow sensor of measured zone, on a large amount of sections, export the signal corresponding with the flow velocity of gas.Though said apparatus has improved measuring accuracy to a certain extent, structure is comparatively complicated, and cost of manufacture is higher, in actual applications, still is difficult to eliminate fully the influence of change of flow state.
Summary of the invention
The present invention mainly is when solving the fluid flow of existing in prior technology in measuring large diameter pipeline, because be subjected to the influence of fluidised form easily, the fluidised form of convection cell is had relatively high expectations, measuring accuracy is lower, sensor is interfered easily, can not truly reflect the technical matters of fluid flow etc.; Provide a kind of easy to implement, can effectively eliminate fluidised form disturbs, low to the fluidised form requirement, even if not being set, fairing can not measure fluid flow in the large diameter pipeline more exactly, the small bore diversion measurement methods and the device of the heavy caliber gas flow that measuring accuracy is high yet.
It is to solve comparatively complexity of existing in prior technology structure that the present invention also has a purpose, and manufacture difficulty is big, the technical matters of the narrower grade of range of application; Provide a kind of reasonable in design, simple in structure, had wide range of applications, can be applicable to the small bore diversion measurement methods and the device of heavy caliber gas flow of the measurement of various large diameter pipelines.
It is to solve existing in prior technology to be difficult to assembling that the present invention has a purpose again, and operation easier is big, and fairing adopts the integral type design, and the dirigibility of use is relatively poor, can't adjust the technical matters of length etc. as required; A kind of be convenient to assembling and operation are provided, and the length that can regulate fairing according to actual needs is to adapt to various workplaces, the small bore diversion measurement methods and the device of the heavy caliber gas flow that the dirigibility of use is big.
Above-mentioned technical matters of the present invention is mainly solved by following technical proposals: the small bore diversion measurement methods of heavy caliber gas flow, it is characterized in that, comprise following measuring process, a. in proportion the shunting: an isocon that bore is less is set in large diameter pipeline at least, by part flow arrangement with the air-flow to be measured in the large diameter pipeline according to predefined proportional diverting in isocon; B. bypass flow is measured: flow sensor is set, by the gas flow in the flow sensor detection isocon in isocon; C. flow rate conversion: the flow value that measures in the isocon is converted into gas flow total value in the large diameter pipeline according to the shunting ratio of setting.
The present invention creatively is provided with isocon in large diameter pipeline, an intercepting part wherein is as the flow detection sample.Owing in shunting, set the shunting ratio, just can calculate flow in the whole pipe easily by the fluid flow in the detected isocon.The one or more small bore flows that promptly intercepted whole large diameter pipeline are extrapolated the flow in the whole pipe as the basis.The reason of intercepting small bore is that bigbore ducted fluid flow state is comparatively complicated in pipeline, has complicated fluidised form situations such as turbulent flow, velocity flow profile be asymmetric, directly can't detect wherein flow exactly by sensor.And bore hour, because the fluidised form of fluid is better, the precision of its measurement is relatively also higher; And in whole large diameter pipeline, the rate of flow of fluid of axis part can reflect the flow velocity of whole pipe more truly, is subjected to the interference of turbulent flow also less.
The present invention is less demanding to rectification, even if the fluid flow state in the large diameter pipeline is not adjusted, as long as the ratio of shunting is accurate, also can detect the flow of whole pipe exactly.In fact, exactly because also be difficult to the fluid flow state of whole pipe is adjusted, and can't accurately reflect ducted flow by modes such as bypass samplings, the detection mode of intercepting small bore in pipeline has just creatively been proposed.
As preferably, the bypass flow value that measures in each isocon is averaged, and calculate gas flow total value in the large diameter pipeline according to the shunting ratio with this mean value.Can reflect the fluid flow in the isocon more exactly by averaging, in general, each isocon bore in the whole large diameter pipeline equates, so that calculate.
As another kind of scheme, the bypass flow value that measures in each isocon is added up, and calculate gas flow total value in the large diameter pipeline according to the shunting ratio with this accumulated value.
In order to reflect the flow velocity of zones of different in the whole pipe comparatively exactly, as preferably, each isocon is evenly distributed in the large diameter pipeline.The flow sensor that is used to measure flow is the thermal mass flow sensor, and first before shunting in proportion air-flow is being carried out rectification.In general, under the situation that an isocon only is set, this isocon is arranged on the axis of large diameter pipeline; When a plurality of isocon is set, be provided with one on the axis of large diameter pipeline, remaining is evenly distributed in the whole large diameter pipeline.
Above-mentioned detection method realizes by following apparatus: the small bore shunt measurement device of heavy caliber gas flow, be arranged on the pipe under test, comprise the snorkel that can connect on pipe under test, be located at the flow sensor in it, it is characterized in that, at least be provided with the isocon of the less setting in parallel in root hole footpath in the described snorkel passage, one end of sensor stand passes the tube wall of isocon, be fixed with sensor in this end, described sensor links to each other with gauging table, is provided with a shunt of shunting in proportion that is positioned at isocon one end in snorkel.
Fluid is shunted at shunt, and a part wherein enters the intercepting that isocon is realized sample.By sensor stand sensor is fixed in the isocon, and the signal of sensor is transferred to the outer gauging table of pipeline.The isocon quantity is here set as required, and in general the bore of pipe under test is big more, and the quantity of isocon is more with regard to corresponding setting.
As preferably, described shunt is fixed on the inwall of snorkel by snap ring, and described shunt comprises body, is arranged on the rectification hole that some axial setting on the body and aperture equate, the axis of each rectification hole and body be arranged in parallel; And body is formed by stacking by some rectiblocks, is connected mutually by syndeton between the adjacent rectiblock.
The present invention is superimposed by the rectiblock of some unified specifications with the whole rectifier of original integrated design, and by syndeton rectiblock is fixed together.Improved the use dirigibility of whole device in this way effectively, its length can realize by the increase and decrease rectiblock.On the other hand,, can make very easily because the thickness of rectiblock is less, and the specification unanimity of each rectiblock, the through hole of Zu Chenging can not influence its internal diameter and the depth of parallelism because length is long yet thus.Each rectiblock can carry out processing and fabricating by modes such as punching press or integral casts.
Fixing for the ease of isocon, and do not influence flowing of fluid, as preferably, described isocon is erected in the snorkel by support; Described support comprises the annulus that is enclosed within on the isocon, and some supports are at the spoke of snorkel inwall, and described annulus is connected mutually with spoke.
For the ease of the fixation of sensor support, as preferably, the tube wall of described snorkel is provided with a matching hole, and sensor stand is fixed in the matching hole, is provided with O-ring seal between the two, and described matching hole links to each other with gauging table by shaft coupling.O-ring seal can guarantee the impermeability of whole pipeline.
As preferably, be provided with 1～5 equally distributed isocon in the described snorkel, and have at least an isocon to be arranged on the axis of snorkel.
As preferably, described sensor is the thermal mass flow sensor, and described snorkel two ends are provided with the ring flange that links to each other with pipe under test.Can easily this device be coupled on the pipe under test by ring flange.
Therefore, the present invention has following advantage: 1. by the comparatively stable partial cross section of fluidised form in the intercepting large diameter pipeline as the sample that detects, calculate ducted real traffic according to predefined shunting ratio, the precision of detection is higher, is subjected to the influence of fluidised form less; 2. less demanding to rectification, accurately under the situation, fluidised form is less to the influence that detects at segregation ratio; 3. reasonable in design, simple in structure, have wide range of applications, can be applicable to the measurement of various large diameter pipelines; 4. be convenient to assembling and operation, the length that can regulate fairing according to actual needs, to adapt to various workplaces, the dirigibility of use is big.
Description of drawings
Accompanying drawing 1 is a kind of sectional structure synoptic diagram of the present invention;
Accompanying drawing 2 is the A-A of Fig. 1 cut-open views along the line;
Accompanying drawing 3 is a kind of side-looking structural representations of the present invention;
Accompanying drawing 4 is sectional structure synoptic diagram that a kind of part flow arrangement of the present invention amplifies;
Accompanying drawing 5 is structure diagrams that the present invention is provided with many isocons.
Among the figure, snorkel 1, ring flange 1a, screw 1b, flow sensor 2, isocon 3, sensor stand 4, sensor 5, gauging table 6, shunt 7, rectification hole 7a, rectiblock 7b, register pin 7c, pilot hole 7d, snap ring 8, support 9, annulus 9a, spoke 9b, matching hole 10, O-ring seal 11, shaft coupling 12, nut 14.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment 1:
The small bore diversion measurement methods of heavy caliber gas flow, comprise following measuring process, a. in proportion the shunting: an isocon that bore is less is set in large diameter pipeline at least, by part flow arrangement with the air-flow to be measured in the large diameter pipeline according to predefined proportional diverting in isocon; B. bypass flow is measured: flow sensor is set, by the gas flow in the flow sensor detection isocon in isocon; C. flow rate conversion: the flow value that measures in the isocon is converted into gas flow total value in the large diameter pipeline according to the shunting ratio of setting.
In the present embodiment, an isocon is set, and this isocon is arranged on the axis of pipeline.The flow sensor that is used to measure flow is the thermal mass flow sensor, and first before shunting in proportion air-flow is being carried out rectification.
Said method realizes that by following apparatus as shown in figures 1 and 3, the small bore shunt measurement device of heavy caliber gas flow is arranged on the pipe under test, comprises the snorkel 1 that can connect on pipe under test, is located at the flow sensor 5 in it.This flow sensor 5 is the thermal mass flow sensor.Snorkel 1 two ends are provided with the ring flange 1a that links to each other with pipe under test, and ring flange 1a is provided with the screw 1b that connects with pipe under test.Be provided with the isocon 3 of the less setting in parallel in root hole footpath in snorkel 1 passage.Stream pipe 3 is arranged on the axis of snorkel 1.One end of sensor stand 4 passes the tube wall of isocon 3, is fixed with sensor 5 in this end, and described sensor 5 links to each other with gauging table 6, is provided with a shunt 7 of shunting in proportion that is positioned at isocon 3 one ends in snorkel 1.Shunt 7 has the effect of rectification and shunting.Shunt 7 is fixed on the inwall of snorkel 1 by snap ring 8, and as shown in Figure 4, shunt 7 comprises body, is arranged on the rectification hole 7a that some axial setting on the body and aperture equate, the axis of each rectification hole 7a and body be arranged in parallel; And body is formed by stacking by some rectiblock 7b, is connected mutually by syndeton between the adjacent rectiblock 7b.Syndeton comprises two register pin 7c and two pilot hole 7d of the symmetric arrangement that is arranged on the rectiblock 7b, the corresponding respectively both sides that are arranged on rectiblock 7b of register pin 7c and pilot hole 7d, and the shape of register pin 7c and pilot hole 7d adapts.
As shown in Figure 2, isocon 3 is erected in the snorkel 1 by support 9; Described support 9 comprises the annulus 9a that is enclosed within on the isocon 3, and three supports are at the spoke 9b of snorkel 1 inwall, and described annulus 9a is connected mutually with spoke 9b.The tube wall of snorkel 1 is provided with a matching hole 10, and sensor stand 4 is fixed in the matching hole 10, is provided with O-ring seal 11 between the two, and described matching hole 10 links to each other with gauging table 6 by shaft coupling 12.Link to each other by nut 14 between shaft coupling 12 and the gauging table 6.
During work, this device is installed on the pipe under test, cooperates by flange between the two.Shunt carries out rectification and shunting with ducted fluid.Be arranged on the fluid flow in the flow sensor detection isocon in the isocon, and passing ratio calculates the flow in the whole pipe.
Embodiment 2:
As shown in Figure 5, three isocons 3 are set in snorkel 1.Each isocon 3 is evenly distributed in the snorkel 1, wherein has an isocon 3 to be arranged on the axis of snorkel 1.The bypass flow value that measures in each isocon 3 is averaged, and calculate gas flow total value in the large diameter pipeline according to the shunting ratio with this mean value.All the other all with embodiment 1 roughly the same, this paper does not do and gives unnecessary details.
Embodiment 3:
In the present embodiment, the bypass flow value that measures in each isocon is added up, and calculate gas flow total value in the large diameter pipeline according to the shunting ratio with this accumulated value.All the other all with embodiment 2 roughly the same, this paper does not do and gives unnecessary details.
Among the present invention, the signal processing of flow sensor and calculating process in proportion are that prior art is known, and those skilled in the art can realize easily that this paper does not do and launches narration.
Specific embodiment described herein only is that the present invention's spirit is illustrated.The technician of the technical field of the invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although this paper has used terms such as snorkel 1, ring flange 1a, screw 1b, flow sensor 2, isocon 3, sensor stand 4, sensor 5, gauging table 6, shunt 7, rectification hole 7a, rectiblock 7b, register pin 7c, pilot hole 7d, snap ring 8, support 9, annulus 9a, spoke 9b, matching hole 10, O-ring seal 11, shaft coupling 12, nut 14 morely, do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain essence of the present invention more easily; They are construed to any additional restriction all is contrary with spirit of the present invention.
Claims (10)
1. the small bore diversion measurement methods of a heavy caliber gas flow is characterized in that, comprises following measuring process,
A. in proportion the shunting: an isocon that bore is less is set in large diameter pipeline at least, by part flow arrangement with the air-flow to be measured in the large diameter pipeline according to predefined proportional diverting in isocon;
B. bypass flow is measured: flow sensor is set, by the gas flow in the flow sensor detection isocon in isocon;
C. flow rate conversion: the flow value that measures in the isocon is converted into gas flow total value in the large diameter pipeline according to the shunting ratio of setting.
2. the small bore diversion measurement methods of heavy caliber gas flow according to claim 1, it is characterized in that, the bypass flow value that measures in each isocon is averaged, and calculate gas flow total value in the large diameter pipeline according to the shunting ratio with this mean value.
3. the small bore diversion measurement methods of heavy caliber gas flow according to claim 1 is characterized in that, the bypass flow value that measures in each isocon is added up, and calculate gas flow total value in the large diameter pipeline with this accumulated value according to the shunting ratio.
4. according to the small bore diversion measurement methods of claim 1 or 2 or 3 described heavy caliber gas flows, it is characterized in that, each isocon is evenly distributed in the large diameter pipeline, the flow sensor that is used to measure flow is the thermal mass flow sensor, and first before shunting in proportion air-flow is being carried out rectification.
5. the small bore shunt measurement device of a heavy caliber gas flow, be arranged on the pipe under test, comprise the snorkel (1) that can connect on pipe under test, be located at the flow sensor (5) in it, it is characterized in that, at least be provided with the isocon (3) of the less setting in parallel in root hole footpath in described snorkel (1) passage, one end of sensor stand (4) passes the tube wall of isocon (3), be fixed with sensor (5) in this end, described sensor (5) links to each other with gauging table (6), is provided with a shunt (7) of shunting in proportion that is positioned at isocon (3) one ends in snorkel (1).
6. the small bore shunt measurement device of heavy caliber gas flow according to claim 5, it is characterized in that, described shunt (7) is fixed on the inwall of snorkel (1) by snap ring (8), described shunt (7) comprises body, be arranged on the equal rectification hole (7a) of some axial setting and aperture on the body, each rectification hole (7a) be arranged in parallel with the axis of body; And body is formed by stacking by some rectiblocks (7b), is connected mutually by syndeton between the adjacent rectiblock (7b).
7. the small bore shunt measurement device of heavy caliber gas flow according to claim 5 is characterized in that, described isocon (3) is erected in the snorkel (1) by support (9); Described support (9) comprises the annulus (9a) that is enclosed within on the isocon (3), and some supports are at the spoke (9b) of snorkel (1) inwall, and described annulus (9a) is connected mutually with spoke (9b).
8. the small bore shunt measurement device of heavy caliber gas flow according to claim 5, it is characterized in that, the tube wall of described snorkel (1) is provided with a matching hole (10), sensor stand (4) is fixed in the matching hole (10), be provided with O-ring seal (11) between the two, described matching hole (10) links to each other with gauging table (6) by shaft coupling (12).
9. according to the small bore shunt measurement device of claim 5 or 6 or 7 or 8 described heavy caliber gas flows, it is characterized in that, be provided with 1～5 equally distributed isocon (3) in the described snorkel (1), and have at least an isocon (3) to be arranged on the axis of snorkel (1).
10. the small bore shunt measurement device of heavy caliber gas flow according to claim 9 is characterized in that, described sensor (5) is the thermal mass flow sensor, and described snorkel (1) two ends are provided with the ring flange (1a) that links to each other with pipe under test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610050583 CN1936506A (en) | 2006-04-29 | 2006-04-29 | Small section branch-flow measuring method for large-diameter gas flow and apparatus thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610050583 CN1936506A (en) | 2006-04-29 | 2006-04-29 | Small section branch-flow measuring method for large-diameter gas flow and apparatus thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101509796B (en) * | 2008-02-12 | 2012-03-21 | 日立金属株式会社 | Flow sensor and mass flow controller using the same |
| CN103075151A (en) * | 2013-01-24 | 2013-05-01 | 西南石油大学 | Flow measurement tool for small section |
| CN104316117A (en) * | 2014-11-20 | 2015-01-28 | 东南大学 | Flow measuring device |
| CN104524723A (en) * | 2015-01-31 | 2015-04-22 | 金纯� | Fire-fighting spray header for air flow detection, fire-fighting spraying system and detection method of fire-fighting spraying system |
| CN107002918A (en) * | 2014-10-15 | 2017-08-01 | 恩德莱斯和豪瑟尔两合公司 | Hybrid flange |
| CN107796452A (en) * | 2017-11-16 | 2018-03-13 | 矽翔微机电系统（上海）有限公司 | Gas flowmeter |
| CN107990945A (en) * | 2017-10-20 | 2018-05-04 | 南京博沃科技发展有限公司 | A kind of hot type porous plate gas flowmeter applied to uneven flow field |
| CN110375819A (en) * | 2019-07-24 | 2019-10-25 | 北京七星华创流量计有限公司 | Part flow arrangement and mass flow controller |
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2006
- 2006-04-29 CN CN 200610050583 patent/CN1936506A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101509796B (en) * | 2008-02-12 | 2012-03-21 | 日立金属株式会社 | Flow sensor and mass flow controller using the same |
| CN103075151A (en) * | 2013-01-24 | 2013-05-01 | 西南石油大学 | Flow measurement tool for small section |
| CN103075151B (en) * | 2013-01-24 | 2015-08-26 | 西南石油大学 | Flow measurement tool for small section |
| US10619771B2 (en) | 2014-10-15 | 2020-04-14 | Endress+Hauser SE+Co. KG | Hybrid flange |
| CN107002918A (en) * | 2014-10-15 | 2017-08-01 | 恩德莱斯和豪瑟尔两合公司 | Hybrid flange |
| CN104316117B (en) * | 2014-11-20 | 2018-04-24 | 东南大学 | A kind of flow measurement device |
| CN104316117A (en) * | 2014-11-20 | 2015-01-28 | 东南大学 | Flow measuring device |
| CN104524723B (en) * | 2015-01-31 | 2017-09-29 | 重庆金瓯科技发展有限责任公司 | A kind of air-flow detection fire-fighting spraying head, spraying system of fire fighting and its detection method |
| CN104524723A (en) * | 2015-01-31 | 2015-04-22 | 金纯� | Fire-fighting spray header for air flow detection, fire-fighting spraying system and detection method of fire-fighting spraying system |
| CN107990945A (en) * | 2017-10-20 | 2018-05-04 | 南京博沃科技发展有限公司 | A kind of hot type porous plate gas flowmeter applied to uneven flow field |
| CN107796452A (en) * | 2017-11-16 | 2018-03-13 | 矽翔微机电系统（上海）有限公司 | Gas flowmeter |
| CN110375819A (en) * | 2019-07-24 | 2019-10-25 | 北京七星华创流量计有限公司 | Part flow arrangement and mass flow controller |
| CN110375819B (en) * | 2019-07-24 | 2021-01-15 | 北京七星华创流量计有限公司 | Flow dividing device and mass flow controller |
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