CN102410856A - Gas flow rate and flow measurement instrument and measurement method - Google Patents
Gas flow rate and flow measurement instrument and measurement method Download PDFInfo
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- CN102410856A CN102410856A CN2011103888815A CN201110388881A CN102410856A CN 102410856 A CN102410856 A CN 102410856A CN 2011103888815 A CN2011103888815 A CN 2011103888815A CN 201110388881 A CN201110388881 A CN 201110388881A CN 102410856 A CN102410856 A CN 102410856A
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- total head
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- gas flow
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Abstract
The invention discloses a gas flow rate and flow measurement instrument and a measurement method. The measurement instrument comprises a total-pressure measurement pipe provided with a rotation wheel, a bearing pointer and a fixing and regulating device, wherein an outlet end of the total-pressure measurement pipe is respectively connected with a total pressure gage and a dynamic pressure gage through a hose and a tee joint. The invention further provides the gas flow rate and flow measurement method, which is characterized in that the total pressure and the static pressure are respectively determined, a static-pressure measurement hole is formed in an air pipe to be measured and is located on a same cross section of a pipeline with a total-pressure measurement port; and the two pressure gages are respectively used for displaying the total pressure and the dynamic pressure, the flow rates of various points are calculated according to the dynamic pressure and the total pressure of each measurement point, and the flow is obtained by multiplying the average flow rate by a cross section area. The measurement method disclosed by the invention is high in accuracy, simple and convenient to operate, and low in cost.
Description
Technical field
The present invention relates to the surveying instrument and the measuring method of a kind of gas flow rate and flow.
Background technology
, generally all use L shaped standard pitot tube to make main instrument now for occasions such as the temporary detecting of general on-the-spot pipeline gas flow rate and flow and draught fan performance tests.But pitot tube is unsatisfactory: wind speed can not be greater than 40m/s, and indicating of having can only be used for 0 ~ 30m/s, and precision is not high yet.This mainly is because its static opening is opened wall outside pitot tube, when wind speed is higher, is difficult to keep to press close to the retention layer of tube wall here, so the static pressure indeterminacy.Big owing to its diameter simultaneously, general 8mm, 10mm, the minimum 6mm in present home market, big caliber is big to the interference that the measurement point fluid state produces, and also big to the interference of air-flow in the whole pipe, this also is a reason that influences measuring accuracy.Because its structure more complicated, manufacture difficulty is big, so each root all will provide concrete calibration factor by manufacturing firm.Because size is big, bad fixing, very inconvenience is used in bad adjusting, and each mensuration will have the above cooperation of two people, also very time-consuming.And price is also expensive.
Summary of the invention
The object of the present invention is to provide a kind of measuring accuracy high, low cost of manufacture, gas flow rate easy and simple to handle and the surveying instrument of flow and measuring method.
The present invention's the gas flow rate and the surveying instrument of flow comprise the total head measuring tube and fixing and the regulating device that have swiveling wheel, orientation pointer, and the endpiece of said total head measuring tube is connected with the dynamic pressure table with the total head table respectively with threeway through flexible pipe.
Further, the right-angle bend of the preferred diameter 3.0mm～1.0mm of said total head measuring tube.
Further, the measuring port end length of said right-angle bend is more than 20 times of caliber.
Further, the measuring port termination of said right-angle bend can be pipe or tapered tube for one section.
Further, said fixing with regulating device is provided with the position indicator pointer that indication total head measuring tube inserts the degree of depth in the tested pipeline.
The present invention's the gas flow rate and the measuring method of flow: the total head measuring tube through having swiveling wheel, orientation pointer and fixing and regulating device is measured total head; Through opening on tested wind pipe wall, being in the static bole independent measurement static pressure in the same xsect with the total head measurement mouth of pipe, total head table and dynamic pressure table show total head and dynamic pressure respectively; Calculate the gas velocity of each point according to the total head of survey each point and dynamic pressure, the mean air flow speed of each point multiply by tested airduct cross-sectional area, obtain flow.
The concrete operations step is: open a circular hole as inserting total head measuring tube usefulness having the evenly straight airduct middle part that meets test request length, again at the aperture that comes to open a diameter 1.5-2.5mm (preferred 2.0 mm) above the gas of airduct as static bole; On the airduct xsect, total head measuring tube patchhole and static bole 30 °～90 ° angles that are separated by; Axial distance between said total head measuring tube patchhole and the static bole equals the measuring port end length of total head measuring tube; During measurement, total head table and dynamic pressure table show total head and dynamic pressure respectively; Just can calculate the gas velocity of each point according to total head and dynamic pressure, the mean air flow speed of each point multiply by tested airduct cross-sectional area and just obtains flow.
Surveying instrument of the present invention is simple in structure, and is with low cost, easy to use; The systematic error of measuring method of the present invention is littler than the measuring method of using pitot tube, and accuracy is higher; Measurable wind speed range is wideer; Because total head measuring tube structure is very simple, can demarcate calibration factor.
Description of drawings
Fig. 1 is the structural representation of the surveying instrument embodiment of the present invention's gas flow rate and flow;
Fig. 2 is the installment state figure of total head measuring tube embodiment illustrated in fig. 1.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
With reference to accompanying drawing; The gas flow rate of present embodiment and the surveying instrument of flow; Comprise and have total head measuring tube 4 fixing and regulating device 6; One end of said total head measuring tube 4 is connected with dynamic pressure table 1 with total head table 2 respectively through flexible pipe, and said total head measuring tube 4 is provided with swiveling wheel 7, orientation pointer 8, and fixing and regulating device 6 is provided with the position indicator pointer 9 that indication total head measuring tube 4 inserts the degree of depth in the tested pipelines 3.
The right-angle bend of said total head measuring tube 4 for making with the seamless stainless steel pipe, used total head measuring tube diameter has in test: 2.3mm, 2.6mm, 3.0mm has also used caliber 3mm-measuring port 2mm.
The measuring port end length of said total head measuring tube 4 is 24 times of caliber.
The gas flow rate of present embodiment and the measuring method of flow: through fixing and regulating device 6 measuring port of total head measuring tube 4 is adjusted to and faces the gas direction; Static pressure measurement point 5 is opened on the tube wall of measured pipeline 3, is positioned at same xsect with the total head measurement point; On xsect, the patchhole of total head measuring tube 4 and static bole 5 are separated by 80 °; When measuring, total head table and dynamic pressure table show total head and dynamic pressure respectively; Just can calculate the gas velocity of each point according to the total head that records and dynamic pressure, it is long-pending that the average velocity of each point multiply by measured cross-section of pipeline, promptly gets flow.Utilize surveying instrument of the present invention and method that 4-72A-4.5#-2900rpm-7.5kW Fan pipeline gas flow rate and flow have been carried out twice test; Twice test airflow data basically identical; The correlation curve figure is very approaching, and wind speed reaches 52m/s and also shows normally.This cover instrument people just can operate easily, just can survey a point in one or two minute.Compare with existing pitot tube, time saving and energy saving more than 90%; It is wideer to survey wind speed range; Data are more accurate; Measure with low cost.
Claims (6)
1. gas flow rate and flowrate measuring tool; It is characterized in that: comprise the total head measuring tube that has swiveling wheel, orientation pointer and fixing and regulating device; The endpiece of said total head measuring tube is connected with the dynamic pressure table with the total head table respectively with threeway through flexible pipe, the dynamic pressure table other end connection static pressure flexible pipe.
2. gas flow rate according to claim 1 and flowrate measuring tool is characterized in that: said total head measuring tube is the right-angle bend of diameter 3.0mm～0.5mm.
3. gas flow rate according to claim 2 and flowrate measuring tool is characterized in that: the measuring port end length of said right-angle bend is more than 20 times of caliber.
4. gas flow rate according to claim 2 and flowrate measuring tool is characterized in that: the measuring port termination of said right-angle bend is straight tube or diminishing tapered tube for one section.
5. according to claim 1 or 2 or 3 or 4 described gas flow rate and flowrate measuring tools, it is characterized in that: said fixing with regulating device is provided with the position indicator pointer that indication total head measuring tube inserts the degree of depth in the tested pipeline.
6. the measuring method of gas flow rate and flow; It is characterized in that: the total head measuring tube through having swiveling wheel, orientation pointer and fixing and regulating device is measured total head; Through opening on tested wind pipe wall, being in the static bole independent measurement static pressure in the same xsect with the total head measurement mouth of pipe, total head table and dynamic pressure table show total head and dynamic pressure respectively; Calculate the gas velocity of each point according to the total head of survey each point and dynamic pressure, the mean air flow speed of each point multiply by tested airduct cross-sectional area, obtain flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110388881.5A CN102410856B (en) | 2011-11-30 | 2011-11-30 | Gas flow rate and flow measurement instrument and measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110388881.5A CN102410856B (en) | 2011-11-30 | 2011-11-30 | Gas flow rate and flow measurement instrument and measurement method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102410856A true CN102410856A (en) | 2012-04-11 |
| CN102410856B CN102410856B (en) | 2014-03-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110388881.5A Expired - Fee Related CN102410856B (en) | 2011-11-30 | 2011-11-30 | Gas flow rate and flow measurement instrument and measurement method |
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| Country | Link |
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| CN (1) | CN102410856B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017835A (en) * | 2012-11-26 | 2013-04-03 | 中国原子能科学研究院 | Parallel narrow-slit rectangular multi-flow-passage flow distribution measuring instrument |
| CN109098995A (en) * | 2017-06-21 | 2018-12-28 | 中车青岛四方机车车辆股份有限公司 | A kind of traction electric machine cooling system air duct and draught fan performance test method and device |
| CN109405906A (en) * | 2018-11-23 | 2019-03-01 | 宁波水表股份有限公司 | A kind of flow measurement device and flow metering method |
| CN112066938A (en) * | 2020-08-31 | 2020-12-11 | 重庆长安汽车股份有限公司 | Method for measuring effective area of through opening |
| CN114838228A (en) * | 2022-06-08 | 2022-08-02 | 西安热工研究院有限公司 | Machining method of smoke air duct measuring section and smoke air duct measuring section |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5365795A (en) * | 1993-05-20 | 1994-11-22 | Brower Jr William B | Improved method for determining flow rates in venturis, orifices and flow nozzles involving total pressure and static pressure measurements |
| CN2655189Y (en) * | 2003-09-23 | 2004-11-10 | 财团法人工业技术研究院 | Double tube type average dynamic pressure measurer |
| JP2007155350A (en) * | 2005-11-30 | 2007-06-21 | Nippon Applied Flow Kk | Flow rate measuring apparatus |
| CN101038296A (en) * | 2007-04-03 | 2007-09-19 | 高明逊 | Non-blocking primary air speed measuring device |
| CN201444058U (en) * | 2009-07-23 | 2010-04-28 | 铁岭市光明仪器仪表厂 | Multivariable pitot flow sensor |
-
2011
- 2011-11-30 CN CN201110388881.5A patent/CN102410856B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5365795A (en) * | 1993-05-20 | 1994-11-22 | Brower Jr William B | Improved method for determining flow rates in venturis, orifices and flow nozzles involving total pressure and static pressure measurements |
| CN2655189Y (en) * | 2003-09-23 | 2004-11-10 | 财团法人工业技术研究院 | Double tube type average dynamic pressure measurer |
| JP2007155350A (en) * | 2005-11-30 | 2007-06-21 | Nippon Applied Flow Kk | Flow rate measuring apparatus |
| CN101038296A (en) * | 2007-04-03 | 2007-09-19 | 高明逊 | Non-blocking primary air speed measuring device |
| CN201444058U (en) * | 2009-07-23 | 2010-04-28 | 铁岭市光明仪器仪表厂 | Multivariable pitot flow sensor |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017835A (en) * | 2012-11-26 | 2013-04-03 | 中国原子能科学研究院 | Parallel narrow-slit rectangular multi-flow-passage flow distribution measuring instrument |
| CN109098995A (en) * | 2017-06-21 | 2018-12-28 | 中车青岛四方机车车辆股份有限公司 | A kind of traction electric machine cooling system air duct and draught fan performance test method and device |
| CN109098995B (en) * | 2017-06-21 | 2020-01-10 | 中车青岛四方机车车辆股份有限公司 | Method and device for testing performance of air duct and fan of traction motor cooling system |
| CN109405906A (en) * | 2018-11-23 | 2019-03-01 | 宁波水表股份有限公司 | A kind of flow measurement device and flow metering method |
| CN112066938A (en) * | 2020-08-31 | 2020-12-11 | 重庆长安汽车股份有限公司 | Method for measuring effective area of through opening |
| CN114838228A (en) * | 2022-06-08 | 2022-08-02 | 西安热工研究院有限公司 | Machining method of smoke air duct measuring section and smoke air duct measuring section |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102410856B (en) | 2014-03-19 |
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Granted publication date: 20140319 Termination date: 20171130 |