CN102410856B - 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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- CN102410856B CN102410856B CN201110388881.5A CN201110388881A CN102410856B CN 102410856 B CN102410856 B CN 102410856B CN 201110388881 A CN201110388881 A CN 201110388881A CN 102410856 B CN102410856 B CN 102410856B
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- total head
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- dynamic pressure
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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 surveying instrument and the measuring method of a kind of gas flow rate and flow.
Background technology
The occasions such as the present temporary detecting for general on-the-spot pipeline gas flow rate and flow and draught fan performance test, are generally all used L shaped standard pitot tube to make key instrument.But pitot tube is unsatisfactory: wind speed can not be greater than 40m/s, and indicating of having can only be for 0 ~ 30m/s, and precision is not high yet.This is mainly because its static opening is opened wall outside pitot tube, when wind speed is higher, is difficult to retain to press close to the retention layer of tube wall herein, so static pressure indeterminacy.Simultaneously because its diameter is large, general 8mm, 10mm, the minimum 6mm in present home market, the interference that Large Diameter Pipeline produces measurement point fluid state is large, and also large to the interference of air-flow in whole pipe, this is also a reason that affects measuring accuracy.Due to its complicated structure, manufacture difficulty is large, so each Gen Douyaoyou manufacturing firm provides concrete calibration factor.Because size is large, bad fixing, bad adjusting, is used very inconveniently, and each mensuration will have two people to cooperate above, 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 gas flow rate and the surveying instrument of flow, comprise total head measuring tube and fixing and regulating device with swiveling wheel, orientation pointer, and the endpiece of described total head measuring tube is connected with dynamic pressure table with total head table respectively with threeway by flexible pipe.
Further, the right-angle bend of the preferred diameter 3.0mm～1.0mm of described total head measuring tube.
Further, the measurement mouth end length of described right-angle bend is caliber more than 20 times.
Further, one section of the measurement mouth termination of described right-angle bend can be pipe or tapered tube.
Further, described fixing with regulating device is provided with the position indicator pointer that indication total head measuring tube inserts the degree of depth in tested pipeline.
The present invention's gas flow rate and the measuring method of flow: by measuring total head with the total head measuring tube of swiveling wheel, orientation pointer and fixing and regulating device, by opening on tested wind pipe wall, measuring the static bole independent measurement static pressure of the mouth of pipe in same xsect with total head, total head table and dynamic pressure table show respectively total head and dynamic pressure; According to the gas velocity of the total head of surveyed each point and dynamic pressure calculation each point, the mean air flow speed of each point is multiplied by tested airduct cross-sectional area, obtain flow.
Concrete operation step is: open a circular hole as inserting total head measuring tube use thering is the evenly straight airduct middle part that meets test request length, then airduct come above gas, open preferably 2.0 mm of a diameter 1.5-2.5mm() aperture as static bole; On airduct xsect, total head measuring tube patchhole and static bole 30 °～90 ° angles that are separated by; Axial distance between described total head measuring tube patchhole and static bole equals the measurement mouth end length of total head measuring tube; During measurement, total head table and dynamic pressure table show respectively total head and dynamic pressure; According to total head and dynamic pressure, just can calculate the gas velocity of each point, the mean air flow speed of each point is multiplied by tested airduct cross-sectional area and just obtains flow.
Surveying instrument of the present invention is simple in structure, with low cost, easy to use; The systematic error of measuring method of the present invention is less than using the measuring method of pitot tube, and accuracy is higher; Measurable wind speed range is wider; Because total head measuring tube structure is very simple, can demarcate calibration factor.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention's gas flow rate and the surveying instrument embodiment of flow;
Fig. 2 is the installment state figure of total head measuring tube embodiment illustrated in fig. 1.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
With reference to accompanying drawing, the gas flow rate of the present embodiment and the surveying instrument of flow, comprise the total head measuring tube 4 with fixing and regulating device 6, one end of described total head measuring tube 4 is connected with dynamic pressure table 1 with total head table 2 respectively by flexible pipe, described 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 tested pipeline 3 interior degree of depth.
The right-angle bend of described total head measuring tube 4 for making of seamless stainless steel pipe, in test, used total head measuring tube diameter has: 2.3mm, 2.6mm, 3.0mm, has also used caliber 3mm-to measure a mouthful 2mm.
The measurement mouth end length of described total head measuring tube 4 is caliber 24 times.
The gas flow rate of the present embodiment and the measuring method of flow: the measurement mouth of total head measuring tube 4 is adjusted to and faces gas direction by fixing and regulating device 6; Static pressure measurement point 5 is opened on the tube wall of measured pipeline 3, is positioned at same xsect with 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 respectively total head and dynamic pressure; According to the total head recording and dynamic pressure, just can calculate the gas velocity of each point, it is long-pending that the average velocity of each point is multiplied by measured cross-section of pipeline, obtains flow.Utilize surveying instrument of the present invention and method to carry out twice test to 4-72A-4.5#-2900rpm-7.5kW Fan pipeline gas flow rate and flow, twice test airflow data is basically identical, correlation curve figure is very approaching, and wind speed reaches 52m/s and also shows normally.This cover instrument a people just can operate easily, within one or two minute, just can survey a point.With existing pitot tube comparison, time saving and energy saving more than 90%; Wind speed range can be surveyed wider; Data are more accurate; Measure with low cost.
Claims (2)
1. the measuring method of a gas flow rate and flow, it is characterized in that: this measuring method surveying instrument used comprises the total head measuring tube with swiveling wheel, orientation pointer and fixing and regulating device, the endpiece of described total head measuring tube is connected with dynamic pressure table with total head table respectively with threeway by flexible pipe, dynamic pressure table the other end connect static pressure flexible pipe;
Described total head measuring tube is the right-angle bend of diameter 3.0mm～0.5mm; It is more than 20 times that the measurement mouth end length of described right-angle bend is caliber; One section of the measurement mouth termination of described right-angle bend is straight tube or diminishing tapered tube;
By measuring total head with the total head measuring tube of swiveling wheel, orientation pointer and fixing and regulating device, by opening on tested wind pipe wall, measuring the static bole independent measurement static pressure of the mouth of pipe in same xsect with total head, total head table and dynamic pressure table show respectively total head and dynamic pressure; According to the gas velocity of the total head of surveyed each point and dynamic pressure calculation each point, the mean air flow speed of each point is multiplied by tested airduct cross-sectional area, obtain flow.
2. the measuring method of gas flow rate according to claim 1 and flow, is characterized in that: described fixing with regulating device is provided with the position indicator pointer that indication total head measuring tube inserts the degree of depth in tested pipeline.
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 CN102410856A (en) | 2012-04-11 |
| CN102410856B true CN102410856B (en) | 2014-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| 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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Families Citing this family (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 |
| 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 |
| CN113533776A (en) * | 2021-07-08 | 2021-10-22 | 湖州霍里思特智能科技有限公司 | Equipment and method for measuring flow velocity of gas in small-aperture pipeline |
| 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 |
Family Cites Families (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 |
| JP4766511B2 (en) * | 2005-11-30 | 2011-09-07 | 日本アプライドフロー株式会社 | Flow measuring device |
| CN100468061C (en) * | 2007-04-03 | 2009-03-11 | 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 |
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