CN100507343C - Method and device for measuring exogenous linear sampling of pipe gas flow - Google Patents
Method and device for measuring exogenous linear sampling of pipe gas flow Download PDFInfo
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- CN100507343C CN100507343C CNB2006100529970A CN200610052997A CN100507343C CN 100507343 C CN100507343 C CN 100507343C CN B2006100529970 A CNB2006100529970 A CN B2006100529970A CN 200610052997 A CN200610052997 A CN 200610052997A CN 100507343 C CN100507343 C CN 100507343C
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Abstract
The invention relates to a measure method and relative device, especially an external linear sample method of tube airflow, wherein the invention can effectively eliminate the effect of foreign material, prolong the service life, and reduce the cost. It comprises: collecting airflow in the tube; guiding the collected airflow outside the tube; in the collecting and discharging processes, the foreign material will be discharged; it uses linear collecting method; at least one sampling open is at the center of tube, that the linear sampling open is layered with the diameter of tube.
Description
Technical field
The present invention relates to a kind of method of measurement and equipment thereof, especially relate to a kind of method of measurement and device thereof of exogenous linear sampling of pipe gas flow.
Background technique
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.
Gas flow measurement element itself is very sensitive, accurate in the pipeline, and the existence of impurity can influence the measuring accuracy of measuring cell 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 cell in order to the measurement gas flow is directly exposed in the gas, and the impurity in the unpurified gas has damage to measuring cell, influences working life, when the gas flow at high speed, damages measuring cell sometimes.Particularly be similar to the measuring cell (MEMS is meant micro electro mechanical system (MEMS) technology) based on the MEMS technology, high-accuracy property of itself and receptance have determined its stringency that working environment is required.This has just limited this application area with high performance measuring cell to a great extent, even can guarantee the precision measured by timely replacing measuring cell, its working service cost can very highly also be well imagined.
On the other hand, the mounting point of measuring cell is in pipeline, changes measuring cell inconvenience very.Generally when making whole measuring device, measuring cell is not designed to Changable type just can carry out because the replacing of measuring cell generally all is a manufacturer, the user need change wherein measuring cell 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 measuring device 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 prober 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 thermal 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 measuring device that is used to measure micrometeor, as a kind of domestic patent No. 200510051726.9 flow transducer and flow measuring device, its technical characteristics is: a kind of flow transducer, 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 transducer have the flow measurement portion that forms heater and temperature sensor on the substrate, and measured fluid between the Out let of fin, output and flow correspondent voltage value of heat conduction, cover the part of above-mentioned fin and the part of above-mentioned Out let 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 characteristic, sonic sensor is designed to capacitive character electroacoustic ultrasonic wave sensor, and be provided with and be used for comparison adjustments of gas temperature characteristic and be used for temperature characteristic the minimized equipment of the influence of gas flow measurement, obtain the method for gas flow, the gas coming through amount of obtaining mean velocity and drawing thus by two transmission times with high time resolution wherein, should realize making the volume flowrate and the more accurate and reliable calculating of mass flow 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 tube 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 sensor of measuring throughput, changes the technical problem that measuring device 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 detection device working life, reduce the method for measurement and the device thereof of the exogenous linear sampling of user cost.
Technical problems such as it is to solve existing in prior technology to keep in repair inconvenience when the gas flow measurement sensor is unusual that the present invention also has a purpose, and the regular maintenance difficulty is big; Provide a kind of critical component has been positioned in the pipeline external bypass pipeline, be convenient to the method for measurement and the device thereof of the exogenous linear sampling of regular maintenance, maintenance and replacing.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals: the exogenous linear sampling measuring device that is arranged at the pipe gas flow on the gas pipeline, it comprises at least one sampling pipe that is wire, having several on sampling pipe is arranged in order and towards the thief hatch of unanimity, one end of sampling pipe places in the pipeline, the other 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 the flow measuring device that is used for the measurement gas flow in drainage tube; Thief hatch towards opposite with the flow direction of air-flow, and to have a sampling pipe at least be center through piping, overlaps with a diameter of 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 measuring device 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 measuring device.In addition, in order to make the air-flow that collects reflect the situation of air-flow in the pipeline truly, the mode that the present invention has adopted wire to gather, in general having a thief hatch at least is the center that is positioned at pipeline, i.e. the thief hatch line of wire distribution overlaps with the diameter 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, be provided with the some sampling pipes that are arranged in parallel and are parallel to each other in the described pipeline, the rearward end of each sampling pipe converges to drainage tube.If adopt an airflow state that can not reflect all sidedly in the pipeline, be provided with many sampling pipes for this reason.In general the sampling pipe quantity of She Zhiing is many more, can reflect real airflow state more; But the proper functioning that too much sampling pipe also can influence pipeline is set.
As preferably, the front end of described sampling pipe withstands on the inwall of above-mentioned pipeline; At this moment, sampling pipe top and gas are disconnected, and gas can not flow into from the sampling pipe top; And be forced in the drainage tube.
As another kind of scheme, described sampling pipe is hung in the above-mentioned pipeline.
As preferably, the front end of described sampling pipe is closed shape; The front end sealing is in order to make gas be easy to flow into sampling pipe.
As preferably, the front end of described sampling pipe is provided with opening, and described opening is towards opposite with the flow direction of air-flow.
As preferably, described thief hatch is rounded; The area summation of all thief hatchs and the ratio of drainage tube sectional area are 1:0～10:0.
As preferably, each thief hatch on the described sampling pipe evenly distributes.
As preferably, each thief hatch on the described sampling pipe is the distribution that closed end is intensive, drainage tube connection place is sparse; 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 exogenous linear sampling measuring device of above-mentioned pipe gas flow is that the exogenous linear sampling method of measurement by following pipe gas flow realizes, it is characterized in that, comprise following measuring phase: gather with sampling pipe and enter at least one air-flow that is a plurality of thief hatchs of wire discrete distribution on the pipeline section, the air-flow that collects converged and lead in the outer drainage tube of pipeline, gas is sent air-flow back to by drainage tube the downstream of pipeline, flow detector is installed in the drainage tube, calculates throughput in the pipeline by detecting throughput in the drainage tube.
Therefore, the present invention has following advantage: measure by bypass, avoided the direct impact of the interior impurity of pipeline to the measuring cell of sensitivity; Measuring cell is installed in outside the pipeline, is convenient for changing measuring cell; Reasonable in design, simple in structure, the collection of air-flow and metering system uniqueness can effectively be eliminated impurity effect, prolong detection device working life, reduce user cost; Critical component is positioned in the pipeline external bypass pipeline, is very easy to regular maintenance and maintenance, and broken parts is in time changed.The present invention can measure the large diameter pipeline throughput, breaks through the limitation of the measuring 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 schematic representation 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 2;
Accompanying drawing 4 is structural representations of the embodiment of the invention 3.
Among the figure, pipeline 1, sampling pipe 2, thief hatch 3, flow measuring device 4, drainage tube 5.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, technological 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 simple substance or mixed gas, wherein mix up various impurity, the granularity of impurity is not enough to blocking pipe, has a circular hole in a side of pipeline, sampling pipe 2 is deep in the pipeline by circular hole, 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 measuring device 4 is installed, the flow of measurement gas on drainage tube.
As shown in Figure 1, the end of sampling pipe 2 touches the inwall of pipeline, and forms a sealed whole body with inner-walls of duct.
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 cell 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 3, the end of sampling pipe 2 does not touch the inwall of pipeline, and the end sealing of sampling pipe 2 is isolated with the air-flow in the pipeline.All the other are all identical with embodiment 1, and this paper does not do and gives unnecessary details.
During use, 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.
Embodiment 3: as shown in Figure 4, the end of sampling pipe 2 does not touch the inwall of pipeline, and the end of sampling pipe 2 has flatly, and the interior airflow direction of the direction of opening 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 of sampling pipe bottom, and the opening of bottom is equivalent to the effect of thief hatch.
Embodiment 4: 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 5: the thief hatch on the sampling pipe is distributed as, and the sampling pipe that is communicated with the place at sampling pipe closed end distribution comparatively dense, with drainage tube partly distributes more sparse.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 video that adopts the hole to arrange, and the air inflow in each hole and intake velocity be different, thereby measurement result is had certain correction.
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 measuring device 4, drainage tube 5 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 (1)
1. the exogenous linear sampling measuring device of a pipe gas flow, be arranged on the gas pipeline (1), it is characterized in that, at least one sampling pipe (2) that is wire is set in described pipeline, described sampling pipe (2) is hung in the above-mentioned pipeline (1), the front end sealing of described sampling pipe (2), one end of sampling pipe (2) places in the pipeline (1), the other end leads to outside the pipeline (1) and with an end of a drainage tube (5) and is connected, having several on the described sampling pipe (2) is arranged in order and towards the thief hatch (3) of unanimity, described thief hatch (3) is front end on sampling pipe intensive, the distribution that drainage tube connection place is sparse, 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); When being provided with some sampling pipes in the described pipeline (1), some sampling pipes are arranged in parallel and are parallel to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100529970A CN100507343C (en) | 2006-08-17 | 2006-08-17 | Method and device for measuring exogenous linear sampling of pipe gas flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100529970A CN100507343C (en) | 2006-08-17 | 2006-08-17 | Method and device for measuring exogenous linear sampling of pipe gas flow |
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| Publication Number | Publication Date |
|---|---|
| CN1920372A CN1920372A (en) | 2007-02-28 |
| CN100507343C true CN100507343C (en) | 2009-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006100529970A Expired - Fee Related CN100507343C (en) | 2006-08-17 | 2006-08-17 | Method and device for measuring exogenous linear sampling of pipe gas flow |
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| CN (1) | CN100507343C (en) |
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- 2006-08-17 CN CNB2006100529970A patent/CN100507343C/en not_active Expired - Fee Related
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| CN1920372A (en) | 2007-02-28 |
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Owner name: MEIXIN SEMICONDUCTOR ( WUXI ) CO., LTD. Free format text: FORMER OWNER: ZHEJIANG MAIM LONG INSTRUMENT CO., LTD. Effective date: 20081024 |
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Effective date of registration: 20081024 Address after: Block 107, New District, Jiangsu, Wuxi Province, China: 214028 Applicant after: Memsic Semiconductor (Wuxi) Co.,Ltd. Address before: Room 416-417, East 525, A building, Zhejiang University Science Park, Xixi Road, Zhejiang, Hangzhou, China: 310027 Applicant before: Maimulong Meters Co., Ltd., Zhejiang |
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