CN1945233A - Measuring method and its device for external screw sampling of pipeline gas flow - Google Patents
Measuring method and its device for external screw sampling of pipeline gas flow Download PDFInfo
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- CN1945233A CN1945233A CN 200610053762 CN200610053762A CN1945233A CN 1945233 A CN1945233 A CN 1945233A CN 200610053762 CN200610053762 CN 200610053762 CN 200610053762 A CN200610053762 A CN 200610053762A CN 1945233 A CN1945233 A CN 1945233A
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Abstract
The present invention relates to measurement method and device, and is especially externally leading screw sampling method and device for measuring pipeline gas flow. The externally leading screw sampling method and device for measuring pipeline gas flow has reasonable design, simple structure, unique gas flow acquiring and measuring mode, capacity of eliminating the influence of impurity, long service life of the measuring device and low use cost. The technological scheme of the present invention is that the externally leading screw sampling device for measuring pipeline gas flow includes at least one screw sampling pipe, which has sampling ports arranged successively in the same direction, and is set inside the pipeline, led outside the pipeline and communicated to one flow leading tube.
Description
Technical field
The present invention relates to a kind of measuring method and equipment thereof, especially relate to a kind of measuring method and device thereof of external screw sampling of chimneying.
Background technology
Gas flow measurement element itself is very sensitive, accurate in the pipeline, and the existence of impurity can influence the measuring accuracy of measuring sensor in the air-flow.During with some gas flow measurement method, such as Roots's (waist wheel) flowmeter, thermal type gas quality flow meter, the impurity in the air-flow even can damage instrument.Even more important one side is: the measuring sensor in order to the measurement gas flow is directly exposed in the gas, and the impurity in the unpurified gas has damage to measuring sensor, influences serviceable life, when the gas flow at high speed, damages measuring sensor sometimes.Particularly be similar to the measuring sensor (MEMS is meant micro electro mechanical system (MEMS) technology) based on the MEMS technology, high-accuracy property of itself and susceptibility have determined its severity that working environment is required.This has just limited this range of application with high performance measuring sensor to a great extent, even can guarantee the precision measured by timely replacing measuring sensor, its working service cost can very highly also be well imagined.
Gases such as the coal gas that flows in pipeline, rock gas are owing to the reason of production technology has the impurity that quantity does not wait through regular meeting.Even if when just entering pipeline be highly purified clean air, also may be because the impurity that carries of pipeline itself, and make gaseous contamination, thus make gas have impurity.What the impurity in the pipeline was very big may be owing to produce during pipe production, thereby it is very high to eliminate the technical difficulty of impurity, in reality, realize gas extremely pure be not unusual difficulty with impurity.
On the other hand, the installation site of measuring sensor is in pipeline, changes measuring sensor inconvenience very.Generally when making whole measurement mechanism, measuring sensor is not designed to changeable type just can carry out because the replacing of measuring sensor generally all is a manufacturer, the user need change wherein measuring sensor be very difficulty, be difficult for realizing.Therefore, when device damage, bring very large inconvenience to the user.It as a kind of domestic patent No. the device of 89104403.5 measurement fluid flow, its feature is: a kind of measurement mechanism of fluid flow, it comprises a pipe that detected fluid is flow through, selected position sheet changes the device of temperature in pipe, and at the detector of the upstream and downstream position measurement temperature of select location, and the device of determining fluid flow rate by the temperature value that records.Pipe is bonded to or embeds in the heat-transfer matcrial layer, and this material is suitable for heat is passed to another part along the direction that is substantially perpendicular to pipe from a part, perhaps passes to a heat conductor that separates with pipe.
For this reason, people have carried out long-term exploration, have proposed diversified embodiment.In the present technology, it much is the flow measurement device that is used to measure micrometeor, as a kind of domestic patent No. 200510051726.9 flow sensor and flow measurement device, its technical characterictic is: a kind of flow sensor, by preventing of the harmful effect of ambient temperature condition, improve measuring accuracy, even make higher viscous fluid or the tiny flow quantity of viscosity to measuring accuracy, also can correctly be determined at the flow of the fluid that flows in the pipe arrangement, and be easy to assembling; This flow sensor have the flow measurement portion that forms heater and temperature sensor on the substrate, and measured fluid between the lead-out terminal of fin, output and flow correspondent voltage value of heat conduction, cover the part of above-mentioned fin and the part of above-mentioned lead-out terminal by molding.This technology is difficult to the flow of measurement gas in the pipeline of big flow.
In the technology, the method for measurement gas flow can also be ultrasonic measurement at present.Number be 200410071282.0 supersonic gas flowmeter and measure the device of explosive motor exhaust gas flow and the method for obtaining gas flow as a kind of domestic applications, its content is: a kind of supersonic gas flowmeter, comprise that one has and send to receive the sound wave transducer, the measuring channel of gas stream warp, and transmission, receive and evaluation electronics, in order to design performance with improvement, particularly temperature stability and simplification and the sensor of considering temperature characterisitic, sonic sensor is designed to capacitive character electroacoustic ultrasonic sensor, and be provided with and be used for comparison adjustments of gas temperature characterisitic and be used for temperature characterisitic the minimized equipment of the influence of gas flow measurement, obtain the method for gas flow, the gas coming through amount of obtaining mean flow rate and drawing thus by two transmission times with high time resolution wherein, should realize making the volumetric flow rate and the more accurate and reliable calculating of mass rate of gas, especially in high dynamic flow, the therefore estimated value of calculated flow rate and by means of the characteristic temperature and the duct wall temperature of gas it being revised at least after determining the transmission time.But be to use the cost of method of ultrasonic measurement very big, so the place of using is very narrow.
Summary of the invention
The present invention solves the easy influence of impurity in the existing in prior technology pipeline and damages the sensing element of measuring airshed, changes the technical matters that measurement mechanism can bring operation and maintenance grade with high costs; Provide a kind of reasonable in design, simple in structure, the collection of air-flow and metering system uniqueness can effectively be eliminated impurity effect, prolong pick-up unit serviceable life, reduce the measuring method and the device thereof of the external screw sampling of use cost.
Technical matterss such as it is to solve existing in prior technology to keep in repair inconvenience when the gas flow measurement sensing element is unusual that the present invention also has a purpose, and the daily servicing difficulty is big; Provide a kind of critical component has been positioned in the pipeline external bypass pipeline, be convenient to the measuring method and the device thereof of the external screw sampling of daily servicing, maintenance and replacing.
Above-mentioned technical matters of the present invention is mainly solved by following technical proposals: the external screw sampling and measuring device that is arranged at the chimneying on the gas pipe line, it comprises at least one spiral sampling pipe, having several on sampling pipe is arranged in order and towards the thief hatch of unanimity, sampling pipe is arranged in the pipeline, its outer end leads to outside the pipeline and with a drainage tube and is connected, the other end of described drainage tube and the downstream of above-mentioned pipeline connect, and are provided with approaching zero the flow detector of the crushing that is used for the detected gas flow in drainage tube; Thief hatch towards opposite with the flow direction of air-flow, and to a sampling pipe be center through piping, the dead in line of thief hatch and pipeline.
The present invention creatively gathers air-flow in pipeline, and the air-flow that collects is led to outside the pipeline.The collection of air-flow and outside draw in the process, impurity is got rid of in time, the air-flow through measurement mechanism comparatively cleans like this.So just can prevent effectively that the impurity in the air-flow directly impacts flow detector in the pipeline.Effectively eliminate the influence of impurity, and improve the measuring accuracy of flow detector flow measurement device.In addition, in order to make the air-flow that collects reflect the situation of air-flow in the pipeline truly, the present invention has adopted the mode of helical acquisition, in general having a thief hatch at least is the center that is positioned at pipeline, promptly the formed plane of thief hatch that distributes of spiral and the radial section of pipeline be overlap or have a certain degree with the radial section of pipeline.Therefore, by the air-flow sampling and the mixing of different parts in the pipeline, can guarantee that the outer tested air-flow that draws reflects the airflow state of pipeline truly, gas flow rate is relevant with flow velocity monodrome in the pipeline in the drainage tube.Air-flow with after the flow detector measurement that almost zero-pressure is decreased, can be got back to again in the downstream of pipeline in drainage tube, and this just has tangible difference with existing technology.
As preferably, described sampling pipe helical disk coiled is plane, the transverse cross-section parallel setting of sampling pipe and pipeline; Sampling pipe helical disk coiled is plane, and its sampled point can more be evenly distributed in the pipeline, can better gather the parameter of gas in the pipeline like this; It is intensive more that spiral helicine sampling pipe twines, accurate more for the gas collecting in the pipeline, and it is too intensive that still spiral helicine sampling pipe twines, can be influential for gas flow, will inevitably cause influence to gas parameter.
As preferably, described sampling pipe helical disk coiled is plane, and sampling pipe is obliquely installed in pipeline, shape γ in an angle between the xsect of described sampling pipe and pipeline; Sampling pipe tilts can be helpful to gathering gas parameter, but the setting of angle has good influence that bad influence is also arranged for gathering gas, setting angle of inclination that therefore can not be random, and to make the pitch angle maximum help be arranged to gathering gas.
As preferably, the inner end of described sampling pipe is closed; Its effect is to make gas be easy to flow into sampling pipe; Because at this moment, sampling pipe top and gas are disconnected, and gas can not flow into from the sampling pipe top, and is forced in the drainage tube.
As preferably, the inner end of described sampling pipe is provided with opening, and described opening is towards opposite with the flow direction of air-flow; The effect of the opening of this moment is identical with adopting mouth, and has gathered the gas parameter at position, pipeline bosom, is very helpful for comprehensive measurement gas parameter.
As preferably, rounded, oval or other shapes of described thief hatch; The ratio of the area summation drainage tube sectional area of all thief hatchs is 1: 0～10: 0; The shape of thief hatch is in order to make the easier inflow sampling pipe of gas, and circular thief hatch is optimal selection; If the measurement influence for gas parameter in the thief hatch that uses other shapes is little, the thief hatch of other shapes as oval or square, all is fine.
As preferably, described thief hatch is provided with the taper collector; Sometimes, just on sampling pipe, open thief hatch, can not reach good sample effect, can consider to use the sampling apparatus that adds, the taper collector for example is installed on thief hatch.
As preferably, each thief hatch on the described sampling pipe evenly distributes; Evenly distribute is simply also to be a kind of technical scheme that easily realizes.
As preferably, intensive in the middle of each thief hatch on the described sampling pipe is, all round sparse distribution; Distribution can reduce the resistance that air-flow enters sampling pipe like this, makes the pipeline that enters that the air-flow of each sampled point can be average.
The external screw sampling and measuring device of above-mentioned chimneying is that the external screw sampled measurements method by following chimneying realizes, it is characterized in that, comprise following measuring process: gather on the pipeline section air-flow of a plurality of thief hatchs of shape Discrete Distribution in the shape of a spiral with sampling pipe, enter air-flow in the sampling pipe in the shape of a spiral in the drainage tube of shape outside sampling pipe flows to pipeline, gas is sent air-flow back to by drainage tube the downstream of pipeline, flow detector is installed in the drainage tube, calculates airshed in the pipeline by detecting airshed in the drainage tube.
Therefore, the present invention has following advantage: measure by bypass, avoided impurity in the pipeline to the direct impact of the measuring sensor of sensitivity, thereby the damage of having avoided responsive measuring sensor has improved whole stability to the inconvenience that use brings; Measuring sensor is installed in outside the pipeline, be convenient for changing measuring sensor, responsive measuring sensor is flimsy element, good again protection is the damage of the measuring sensor of inevitable sensitivity also, be convenient to change the measuring sensor design, when making measuring sensor impaired, can change as soon as possible, to reduce because the inconvenience that parts damages bring to use and reduce to lose; Reasonable in design, simple in structure, the collection of air-flow and metering system uniqueness, can effectively eliminate impurity effect, prolong pick-up unit serviceable life, reduce use cost, the single cost of responsive measuring sensor is relatively more expensive, the measuring sensor of better protection sensitivity reduces the expense of maintenance greatly, is very useful for the user; Critical component is positioned in the pipeline external bypass pipeline, is very easy to daily servicing and maintenance, and broken parts is in time changed.The present invention can measure the large diameter pipeline airshed, breaks through the limitation of the measurement range of flowmeter in the past; With respect to ultrasonic measuring device, manufacturing cost and use cost is cheap.
Description of drawings
Accompanying drawing 1 is a kind of main TV structure synoptic diagram of the present invention;
Accompanying drawing 2 is a kind of side-looking structural representations of the present invention;
Accompanying drawing 3 is structural representations of the embodiment of the invention 5;
Accompanying drawing 4 is structural representations of the embodiment of the invention 4;
Accompanying drawing 5 is structural representations of the embodiment of the invention 6;
Accompanying drawing 6 is structural representations of the embodiment of the invention 2.
Among the figure, pipeline 1, sampling pipe 2, thief hatch 3, flow measurement device 4, drainage tube 5, opening 6, taper collector 7.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment 1:
As shown in Figure 1 and Figure 2, what flow in the pipeline 1 is high speed, unpurified gas, gas can be simple substance or mixed gas, wherein mix up various impurity, the granularity of impurity is not enough to blocking pipe, side at pipeline has a circular hole, sampling pipe 2 is deep in the pipeline by circular hole, shape γ in an angle between the xsect coincidence of sampling pipe 2 pipelines or the xsect of sampling pipe and pipeline, be placed with thief hatch 3 on the sampling conduit, thief hatch 3 arranging on sampling pipe can be uniformly, also can be arrangement heterogeneous; Sampling pipe be externally connected to drainage tube 5, the diameter of drainage tube is littler than sampling pipe, is convenient to introduce gas; Drainage tube one termination sampling pipe, the sidewall of a termination pipeline 1, gas stream are behind drainage tube, in the flow ipe; Flow measurement device 4 is installed, the flow of measurement gas on drainage tube.
As shown in Figure 1, the sealing of the end of sampling pipe 2, and the plane that sampling pipe forms overlaps with the cross section of pipeline; The pipeline of sealing can make air-flow be subjected to less resistance can flow into drainage tube along sampling pipe, thereby makes the parameters of the gas in pipeline and the drainage tube all more approaching.
During use, gas flow direction is opposite with the opening direction of thief hatch, gas flows to drainage tube along sampling pipe after entering thief hatch, in this process, impurity in the gas has obtained filtration, when gas flows at drainage tube, contacts with measurement component, gas flow back in the pipeline by behind the drainage tube.
In the gaseous environment at measuring sensor place and the pipeline similar substantially (parameters such as flow velocity, pressure, temperature), therefore the interior numerical value of the numerical value of measuring and pipeline is very approaching.
Embodiment 2: as shown in Figure 6, the end of sampling pipe 2 has flatly, and the interior airflow direction of the direction of opening 6 and pipeline is opposite.All the other are all identical with embodiment 2, and this paper does not do and gives unnecessary details.
During use, air-flow also can enter from the opening 6 of sampling pipe bottom, and the opening 6 of bottom is equivalent to the effect of thief hatch.
Embodiment 3: as shown in Figure 2, the thief hatch on the sampling pipe be distributed as even distribution, the distance between each hole is identical, all the other are all identical with embodiment 1, this paper does not do and gives unnecessary details.
Embodiment 4: as shown in Figure 4, the thief hatch on the sampling pipe is distributed as, and each thief hatch on the sampling pipe is intensive in the middle of being, all round sparse distribution.All the other are all identical with embodiment 1, and this paper does not do and gives unnecessary details.
Embodiment 5: as shown in Figure 3, shape γ in an angle between the xsect of sampling pipe and pipeline, all the other are all identical with embodiment 1, and this paper does not do and gives unnecessary details.
During use, gas is subjected to the influence of adopting the hole to arrange, and the air inflow in each hole and intake velocity be different, thereby measurement result is had certain correction.
Embodiment 6: as shown in Figure 5, the taper collector is installed on thief hatch, all the other are all identical with embodiment 1, and this paper does not do and gives unnecessary details.
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 pipeline 1, sampling pipe 2, thief hatch 3, flow measurement device 4, drainage tube 5, opening 6, taper collector 7 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 measurement mechanism of the external screw of chimneying sampling, be arranged on the gas pipe line (1), it is characterized in that, it comprises at least one spiral sampling pipe (2), having several on sampling pipe (2) is arranged in order and towards the thief hatch (3) of unanimity, sampling pipe (2) is arranged in the pipeline (1), its outer end leads to outside the pipeline (1) and with a drainage tube (5) and is connected, the downstream of the other end of described drainage tube (5) and above-mentioned pipeline (1) connects, and is provided with approaching zero the flow detector (4) of the crushing that is used for the detected gas flow in drainage tube (5).
2. the measurement mechanism of the external screw of chimneying according to claim 1 sampling is characterized in that described sampling pipe (1) helical disk coiled is plane, the transverse cross-section parallel setting of sampling pipe (2) and pipeline (1).
3. the measurement mechanism of the external screw of chimneying according to claim 1 sampling, it is characterized in that, described sampling pipe (2) helical disk coiled is plane, sampling pipe (2) is obliquely installed in pipeline (1), forms an angle γ between the xsect of described sampling pipe (2) and pipeline (1).
4. the measurement mechanism of sampling according to the external screw of claim 1 or 2 or 3 described chimneyings is characterized in that the inner end of described sampling pipe (2) is closed.
5. the measurement mechanism of sampling according to the external screw of claim 1 or 2 or 3 described chimneyings it is characterized in that the inner end of described sampling pipe (2) is provided with opening (6), and described opening (6) is towards opposite with the flow direction of air-flow.
6. the measurement mechanism of the external screw of chimneying according to claim 4 sampling is characterized in that, rounded, oval or other shapes of described thief hatch (3); The ratio of area summation drainage tube (5) sectional area of all thief hatchs is 1: 0～10: 0.
7. the measurement mechanism of the external screw of chimneying according to claim 5 sampling is characterized in that described thief hatch (3) is provided with taper collector (7).
8. the measurement mechanism of sampling according to the external screw of claim 1 or 2 or 3 described chimneyings is characterized in that, each thief hatch (3) on the described sampling pipe (2) evenly distributes.
9. according to the measurement mechanism of the external screw of claim 1 or 2 or 3 described chimneyings sampling, it is characterized in that intensive in the middle of each thief hatch (3) on the described sampling pipe (2) is, all round sparse distribution.
10. the external screw sampled measurements method of a chimneying, it is characterized in that, comprise following measuring process: gather on pipeline (1) cross section air-flow of a plurality of thief hatchs (3) of shape Discrete Distribution in the shape of a spiral with sampling pipe (2), enter air-flow in the sampling pipe (2) in the shape of a spiral in the drainage tube (5) of shape outside sampling pipe (2) flows to pipeline (1), gas is sent air-flow back to by drainage tube (5) downstream of pipeline (1), flow detector (4) is installed in the drainage tube (5), calculates the interior airshed of pipeline (1) by the airshed that detects in the drainage tube (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100537623A CN100416234C (en) | 2006-09-30 | 2006-09-30 | Measuring method and its device for external screw sampling of pipeline gas flow |
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| CNB2006100537623A CN100416234C (en) | 2006-09-30 | 2006-09-30 | Measuring method and its device for external screw sampling of pipeline gas flow |
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| CN1945233A true CN1945233A (en) | 2007-04-11 |
| CN100416234C CN100416234C (en) | 2008-09-03 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102032930A (en) * | 2010-10-15 | 2011-04-27 | 西安交通大学 | Shunting type coal gas flow measurement device and measurement method thereof |
| CN103017844A (en) * | 2012-11-26 | 2013-04-03 | 昆山北极光电子科技有限公司 | Low cost air flow measuring method |
| CN104422602A (en) * | 2013-08-21 | 2015-03-18 | 上海宝钢工业技术服务有限公司 | Stationary pollution source unpowered constant-speed sampling method |
| CN111442749A (en) * | 2020-04-13 | 2020-07-24 | 石家庄钢铁有限责任公司 | Water immersion ultrasonic online bending measurement method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5848816A (en) * | 1981-09-18 | 1983-03-22 | Hitachi Ltd | Air flow meter |
| CN2041422U (en) * | 1988-07-30 | 1989-07-19 | 江苏省无锡市水表厂 | Uniform speed tube shunting type water meter |
| US5333496A (en) * | 1992-03-09 | 1994-08-02 | Fenelon Paul J | In-line parallel proportionally partitioned by-pass metering device and method |
| JP3785338B2 (en) * | 2001-07-25 | 2006-06-14 | 株式会社日立製作所 | Thermal flow meter |
-
2006
- 2006-09-30 CN CNB2006100537623A patent/CN100416234C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102032930A (en) * | 2010-10-15 | 2011-04-27 | 西安交通大学 | Shunting type coal gas flow measurement device and measurement method thereof |
| CN102032930B (en) * | 2010-10-15 | 2012-07-04 | 西安交通大学 | Shunting type coal gas flow measurement device and measurement method thereof |
| CN103017844A (en) * | 2012-11-26 | 2013-04-03 | 昆山北极光电子科技有限公司 | Low cost air flow measuring method |
| CN104422602A (en) * | 2013-08-21 | 2015-03-18 | 上海宝钢工业技术服务有限公司 | Stationary pollution source unpowered constant-speed sampling method |
| CN104422602B (en) * | 2013-08-21 | 2018-11-23 | 上海宝钢工业技术服务有限公司 | Isokinetic sampling's method that stationary source is unpowered |
| CN111442749A (en) * | 2020-04-13 | 2020-07-24 | 石家庄钢铁有限责任公司 | Water immersion ultrasonic online bending measurement method |
| CN111442749B (en) * | 2020-04-13 | 2022-05-03 | 石家庄钢铁有限责任公司 | Water immersion ultrasonic online bending measurement method |
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