CN102313582A - High-precision differential pressure flowmeter - Google Patents
High-precision differential pressure flowmeter Download PDFInfo
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- CN102313582A CN102313582A CN 201110224997 CN201110224997A CN102313582A CN 102313582 A CN102313582 A CN 102313582A CN 201110224997 CN201110224997 CN 201110224997 CN 201110224997 A CN201110224997 A CN 201110224997A CN 102313582 A CN102313582 A CN 102313582A
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- differential pressure
- flow
- pipeline
- hole
- pressure
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Abstract
The invention discloses a high-precision differential pressure flowmeter and particularly relates to a pipeline flow instrument for measuring gas, vapor and liquid. The high-precision differential pressure flowmeter consists of a flow cylinder, a differential pressure transmitter and a flow meter. Two crossed porous differential pressure generating pipes are arranged inside the flow cylinder. The middle of a pipeline of each differential pressure generating pipe is provided with a clapboard so that the differential pressure generating pipe is divided into a front side pipeline and a reverse side pipeline. The front side pipelines and the reverse side pipelines are provided with small holes, i.e. high pressure holes and low pressure holes, which are unevenly distributed in a concentric circle shape. The high pressure holes are communicated, the low pressure holes are communicated and the high pressure holes are not communicated with the low pressure holes, so that high pressure chambers and low pressure chambers are formed. A differential pressure is formed, so that a mass flow or a volume flow can be calculated. The high-precision differential pressure flowmeter has an adjustable range, is flexible to apply, has high precision and can be used for measuring the flow of the gas, the vapor and the liquid.
Description
Technical field
The present invention relates to the pipeline flow measuring instrument device of measurement gas, gas and liquid, specifically, relate to a kind of high precision differential pressure flowmeter.
Background technology
The classic method of measurement gas, gas, fluid flow has throttling to get differential pressure pressure type, ultrasound wave etc.; Differential pressure type is measured restriction device abacus, nozzle and the Venturi tube of flow; But there are congenital structural defective in orifice plate, nozzle etc. on measurement performance and structure; Some shortcomings that itself is intrinsic still fail to be well solved so far.As: efflux coefficient is unstable, linearity is poor, repeatability is bad, accuracy is not high yet.
At present, the degree of accuracy of throttle differential flowmeter is in medium level always in flowmeter, and range for measuring is narrower, and on-the-spot mounting condition is higher, and crushing is big.Although the appearance of turriform flowmeter makes the throttle type differential pressure meter that " qualitative leap " take place, had the advantage that a series of other differential pressure meters can't be compared, in the demand that also is not enough to satisfy modern industry aspect its measuring accuracy.
Summary of the invention
The present invention is intended to overcome the deficiency of prior art, provides that a kind of differential pressure is big, precision is high, the installation and maintenance flowmeter of differential pressure type easily.
The technical scheme that the present invention adopts is: this flowmeter is made up of flow tube, differential pressure transmitter and flow instrument; The porous differential pressure generator tube of two right-angled intersections is equipped with in the inside of flow tube, in the middle of the pipeline of differential pressure generator tube a dividing plate is arranged, and is isolated into front pipeline and reverse side pipeline; Front pipeline and reverse side pipeline all have the aperture that is concentric circles annular uneven distribution; Be respectively pressure hole and low pressure hole, be interconnected between the pressure hole, low pressure also is interconnected between the hole; Pressure hole and low pressure hole are then not connected, form hyperbaric chamber and low-pressure chamber.Constitute differential pressure, and then can calculate mass rate or volumetric flow rate.
The aperture in each hole on the above-mentioned porous differential pressure generator tube is 8mm, and the diameter of the pipeline of institute's energy measurement is 80mm～1000mm.
The number in above-mentioned hole is 2～6 pairs.
The two ends of above-mentioned flow tube can be made into the flange type of attachment and be connected with process pipe.
Principle of work of the present invention:
According to flow equation:
Q in the formula
m--mass rate, kg/s;
q
v--volumetric flow rate, m
3/ s;
α-coefficient of flow;
ε--expansibility factor;
D--condition of work internal diameter of the pipeline, m;
The dp--differential pressure, Pa;
ρ--fluid density, kg/m
3
Visible by following formula, dp and flow are quadratic relationship, and its degree of accuracy influences bigger to the flow resultnat accuracy, error amount generally should be controlled at ± and about 0.5%, the numerical value of d is designing according to the size of actual pipeline.The α coefficient of flow is only relevant with the structure of differential pressure generator tube, with fluid or media independent.
The flow of measuring media is the best more than 60% or 60% of range, because the normal flow of measuring is too little, makes differential pressure very little, influences its precision.
The aperture in the hole of porous differential pressure generator tube is 8mm, and the foreign matter of medium advances easily, also goes out easily; Then be difficult for when foreign matter being arranged piling up near 4 Kong Ruo at pipeline edge.The hole can be 2 pairs, 3 pairs, 4 pairs, 5 pairs, 6 pairs, and pitch-row waits to confirm according to caliber, medium and technological parameter.According to different measurement ranges, calculate maximum differential pressure, confirm the distribution and the pitch-row in hole.When fluid passes the hole, fluid will be balanced rectification, and eddy current is minimized; Form the approximate ideal fluid; Differential pressure generator tube front pipeline and reverse side pipeline can be connected to the plemum and the negative pressure chamber of differential pressure transmitter, and differential pressure shows that in differential pressure transmitter differential pressure shows through flow instrument.
Adopt advantage of the present invention to be: measuring range adjustable of the present invention, applying flexible, precision is high, but measurement gas, gas, fluid flow; High precision flow of the present invention has two-way flow measurement ability, and easy to maintenance, low to requirements of installation space.
Description of drawings
Fig. 1 is a structural representation of the present invention.
The structural representation of the present invention that Fig. 2 connects for flange.
1-flow tube among the figure, 2-differential pressure transmitter, 3-flow instrument, 4-porous differential pressure generator tube, 5-flange.
Embodiment
Embodiment:
Flowmeter is made up of flow tube (1), differential pressure transmitter (2) and flow instrument (3); The porous differential pressure generator tube (4) of two right-angled intersections is equipped with in the inside of flow tube (1), in the middle of the pipeline of differential pressure generator tube (4) dividing plate is arranged, and is isolated into front pipeline and reverse side pipeline; Front pipeline and reverse side pipeline all have the aperture that is concentric circles annular uneven distribution; Be respectively pressure hole and low pressure hole, be interconnected between the pressure hole, low pressure also is interconnected between the hole; Pressure hole and low pressure hole are then not connected, form hyperbaric chamber and low-pressure chamber.Constitute differential pressure, and then can calculate mass rate or volumetric flow rate.The aperture in each hole on the porous differential pressure generator tube is 8mm, and the number in hole is 2～6 pairs, and the two ends of flow tube are made into flange (5) type of attachment and are connected with process pipe.
Claims (4)
1. high precision differential pressure flowmeter, it is characterized in that: it is made up of flow tube (1), differential pressure transmitter (2) and flow instrument (3); The porous differential pressure generator tube (4) of two right-angled intersections is equipped with in the inside of flow tube (1), in the middle of the pipeline of differential pressure generator tube (4) dividing plate is arranged, and is isolated into front pipeline and reverse side pipeline; Front pipeline and reverse side pipeline all have the aperture that is concentric circles annular uneven distribution; Be respectively pressure hole and low pressure hole, be interconnected between the pressure hole, low pressure is interconnected between the hole; Pressure hole and low pressure hole are then not connected, form hyperbaric chamber and low-pressure chamber.
2. high precision differential pressure flowmeter according to claim 1 is characterized in that: the diameter in the hole on the said porous differential pressure generator tube (4) is 8mm, and the diameter of the pipeline of institute's energy measurement is 80mm～1000mm.
3. high precision differential pressure flowmeter according to claim 1 is characterized in that: the number in said hole is 2～6 pairs.
4. high precision differential pressure flowmeter according to claim 1 is characterized in that: the two ends of said flow tube can be made into flange (4) type of attachment and be connected with process pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110224997 CN102313582A (en) | 2011-08-08 | 2011-08-08 | High-precision differential pressure flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110224997 CN102313582A (en) | 2011-08-08 | 2011-08-08 | High-precision differential pressure flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102313582A true CN102313582A (en) | 2012-01-11 |
Family
ID=45426955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110224997 Pending CN102313582A (en) | 2011-08-08 | 2011-08-08 | High-precision differential pressure flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102313582A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103292855A (en) * | 2013-07-09 | 2013-09-11 | 唐山科汇达仪器仪表有限公司 | On-line pluggable target flowmeter |
| CN103323060A (en) * | 2013-06-11 | 2013-09-25 | 鞍钢股份有限公司 | Method for testing gas flow and flow velocity of pipeline |
| CN109117579A (en) * | 2018-08-30 | 2019-01-01 | 沈阳云仿科技有限公司 | A kind of design and calculation method of multi-hole orifice flowmeter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008224466A (en) * | 2007-03-14 | 2008-09-25 | Tsukasa Sokken Co Ltd | Flowmeter having variable sectional area orifice |
| US7461563B1 (en) * | 2007-09-07 | 2008-12-09 | Daniel Measurement And Control, Inc. | Bi-directional orifice plate assembly |
| CN201281614Y (en) * | 2008-11-04 | 2009-07-29 | 杭州华源人工环境工程有限公司 | Air quantity measuring device of air quantity change end device |
| CN201289392Y (en) * | 2008-11-14 | 2009-08-12 | 何庆 | Combined homo-speed tube flow sensor for detection lever |
-
2011
- 2011-08-08 CN CN 201110224997 patent/CN102313582A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008224466A (en) * | 2007-03-14 | 2008-09-25 | Tsukasa Sokken Co Ltd | Flowmeter having variable sectional area orifice |
| US7461563B1 (en) * | 2007-09-07 | 2008-12-09 | Daniel Measurement And Control, Inc. | Bi-directional orifice plate assembly |
| CN201281614Y (en) * | 2008-11-04 | 2009-07-29 | 杭州华源人工环境工程有限公司 | Air quantity measuring device of air quantity change end device |
| CN201289392Y (en) * | 2008-11-14 | 2009-08-12 | 何庆 | Combined homo-speed tube flow sensor for detection lever |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323060A (en) * | 2013-06-11 | 2013-09-25 | 鞍钢股份有限公司 | Method for testing gas flow and flow velocity of pipeline |
| CN103292855A (en) * | 2013-07-09 | 2013-09-11 | 唐山科汇达仪器仪表有限公司 | On-line pluggable target flowmeter |
| CN109117579A (en) * | 2018-08-30 | 2019-01-01 | 沈阳云仿科技有限公司 | A kind of design and calculation method of multi-hole orifice flowmeter |
| CN109117579B (en) * | 2018-08-30 | 2022-12-27 | 沈阳云仿致准科技股份有限公司 | Design calculation method of porous orifice plate flowmeter |
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Application publication date: 20120111 |