CN201413167Y - Differential pressure type vortex mass flow meter - Google Patents
Differential pressure type vortex mass flow meter Download PDFInfo
- Publication number
- CN201413167Y CN201413167Y CN2009201575918U CN200920157591U CN201413167Y CN 201413167 Y CN201413167 Y CN 201413167Y CN 2009201575918 U CN2009201575918 U CN 2009201575918U CN 200920157591 U CN200920157591 U CN 200920157591U CN 201413167 Y CN201413167 Y CN 201413167Y
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- differential pressure
- vortex
- measuring tube
- measurement
- flow
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Abstract
The utility model belongs to the field of fluid measurement apparatus, especially relates to a differential pressure type vortex mass flow meter for measuring mass and flow of gas or steam. The mass flow Rho is measured by sequentially installing a rectifier, a vortex generator body, a detection probe, a taper type orifice; detecting connection between the probe and the vortex signal amplifier; detecting the flow signal Q; coinciding the central axis of the taper type orifice with the central axis of the measurement tube; assembling an upstream impulse pipe and a downstream impulse pipe on front and rear side of the taper type orifice respectively, connecting the upstream impulse pipe and the high pressure end of the differential pressure transmitter, connecting the downstream impulse pipeand the low pressure end of the differential pressure transmitter, and obtaining the differential pressure Delta P through the differential pressure; inputting Q and Delta P into the a flow integrating instrument for integration. By adopting the apparatus in measurement of gases and steam, measurement error due to effect of media composition, compression coefficient, and dryness; by compensatingdensity by the differential pressure, measurement precision is high, and is immune to media composition, compression coefficient, and dryness.
Description
Technical field
The utility model belongs to the fluid measurement apparatus field, particularly a kind of differential pressure type mass flowmeter for vortex street that is used for measurement gas or steam mass flow.
Background technology
At present, with vortex shedding flow meter measurement gas or steam mass flow method in common is to adopt temperature and pressure compensation, promptly the pressure and temperature with duty accesses the operating mode volumetric flow rate that corresponding density compensates the vortex shedding flow meter measurement in the standard density table, thereby draws mass rate.This measuring method weak point mainly shows, when the measurement gas mass rate, the compressibility coefficient influence of gas increases with the increase of pressure, because the nonlinear relationship between compressibility coefficient and temperature, pressure, cause the relation between the compressibility coefficient of gas and temperature, the pressure complicated more, be difficult to describe with mathematical relation, the complexity more that this just makes bucking-out system become, and measuring accuracy is reduced.The variation of gas composition can cause the variation of density in addition, and this variation can't compensate by pressure, temperature; When measuring steam mass flow, the variable density that causes because of the variation of steam quality, can not be compensated by pressure and temperature, so the vortex shedding flow meter that adopts temperature, pressure compensated method is for unsettled gas of media components and supersaturated vapour or to contain the measuring accuracy of steam not high.
Summary of the invention
Adopt temperature, pressure compensated mode for the not high deficiency of special media measuring accuracy in order to overcome traditional vortex shedding flow meter, the utility model is derived the funtcional relationship of differential pressure and density according to the continuity equation of Bernoulli's theorem and fluid, a kind of differential pressure type mass flowmeter for vortex street is provided, it is characterized in that, inlet end at measuring tube 4 is provided with rectifier 1, middle front part is provided with eddy generator 2, the tapered throttling element 3 that the endpiece setting is fixed by fixed bar 14; Base 13 is positioned at the middle front part of measuring tube 4 sidewalls, is connected as a single entity with measuring tube 4; Installation and measuring probe 8 on base 13, the afterbody of detection probe 8 is fixing by briquetting 9, and probe segment stretches into measuring tube 4 and is positioned at eddy generator 2 rears; Radome 10 and vortex signal amplifier 12 are installed above briquetting 9 successively, and detection probe 8 are connected with vortex signal amplifier 12 by signal wire 11; On measuring tube 4 tube walls in tapered throttling element 3 centrum the place aheads, upstream pressure guide hole 5 is set, on measuring tube 4 tube walls at tapered throttling element 3 centrum rears, downstream pressure guide hole 14 is set, and connects connecting pipe 6 respectively, and be connected with differential pressure transmitter 7 by connecting pipe 6; Differential pressure transmitter 7 is connected with flow integrator 15 with vortex signal amplifier 12.
The axis of described tapered throttling element 3 overlaps with the axis of measuring tube 4.
The beneficial effects of the utility model are: the utility model is used for the measurement of gas or steam, can get rid of the influence of media components, compressibility coefficient and mass dryness fraction and the measuring error brought, and then has improved the accuracy of detection of flowmeter.This flowmeter is to come compensation density by getting differential pressure, and this measuring method is not subjected to the influence of media components, compressibility coefficient and mass dryness fraction, and measuring accuracy is higher.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Number in the figure:
The 1-rectifier; 2-vortex generation body; The tapered throttling element of 3-; The 4-measuring tube; 5-upstream pressure guide hole;
The 6-connecting pipe; The 7-differential pressure transmitter; The 8-detection probe; The 9-briquetting; The 10-radome; The 11-signal wire;
12-vortex signal amplifier; The 13-base; The 14-fixed bar; The 15-flow integrator;
16-downstream pressure guide hole.
Embodiment
The utility model provides a kind of differential pressure type mass flowmeter for vortex street, below by description of drawings and specific implementation method the utility model is described further.
Fig. 1 is a structural representation of the present utility model.Inlet end at measuring tube 4 is provided with rectifier 1, and middle front part is provided with eddy generator 2, the tapered throttling element 3 that the endpiece setting is fixed by fixed bar 14, and wherein, the axis of tapered throttling element 3 overlaps with the axis of measuring tube 4; Base 13 is positioned at the middle front part of measuring tube 4 sidewalls, is connected as a single entity with measuring tube 4; Installation and measuring probe 8 on base 13, the afterbody of detection probe 8 is fixing by briquetting 9, and probe segment stretches into measuring tube 4 and is positioned at eddy generator 2 rears; Radome 10 and vortex signal amplifier 12 are installed above briquetting 9 successively, and detection probe 8 are connected with vortex signal amplifier 12 by signal wire 11; On measuring tube 4 tube walls in tapered throttling element 3 centrum the place aheads, upstream pressure guide hole 5 is set, on measuring tube 4 tube walls at tapered throttling element 3 centrum rears, downstream pressure guide hole 14 is set, and connects connecting pipe 6 respectively, and be connected with differential pressure transmitter 7 by connecting pipe 6; Differential pressure transmitter 7 is connected with flow integrator 15 with vortex signal amplifier 12.
Vortex generation body 2, detection probe 8 and vortex signal amplifier 12 are formed the volume flow measurement unit; Vortex generation body 2 utilizes the theoretical operating mode volumetric flow rate of measuring of Karman vortex street.Pressure guide hole 5, connecting pipe 6 are formed the differential pressure measurement unit with differential pressure transmitter 7; Differential pressure transmitter 7 can be measured the differential pressure through tapered throttling element 3.The volume flow measurement unit is connected with flow integrator 15 respectively with the differential pressure measurement unit, and whole computation process is finished by flow integrator 15.
Derive the function formula of density and differential pressure: ρ=K according to the continuity equation of Bernoulli's theorem and fluid
2Δ P/Q
2, ρ is a Media density in the formula, and Q is the operating mode volumetric flow rate, and K is an instrument coefficient, as long as measure differential pressure value Δ P thus and the operating mode volume flow Q just can draw Media density ρ.When medium through the vortex generation body 2 of flowing through after rectifier 1 rectification, detection probe 8 can detect flow signal Q, transferring to integrating instrument 15 after being handled by vortex signal amplifier 12 by signal wire 11 calculates, then MEDIA FLOW is through tapered throttling element 3, record differential pressure signal Δ P by connecting pipe 6 differential pressure transmitters 7, also transfer to flow integrator 15 and calculate.Calculate the mass rate ρ of medium at last by integrating instrument 15.
Claims (2)
1. the differential pressure type mass flowmeter for vortex street is characterized in that, at the inlet end of measuring tube (4) rectifier (1) is set, and middle front part is provided with eddy generator (2), and the endpiece setting is by the fixing tapered throttling element (3) of fixed bar (14); Base (13) is positioned at the middle front part of measuring tube (4) sidewall, is connected as a single entity with measuring tube (4); Go up installation and measuring probe (8) at base (13), the afterbody of detection probe (8) is fixing by briquetting (9), and probe segment stretches into measuring tube (4) and is positioned at eddy generator (2) rear; In briquetting (9) top radome (10) and vortex signal amplifier (12) are installed successively, and detection probe (8) are connected with vortex signal amplifier (12) by signal wire (11); On measuring tube (4) tube wall in tapered throttling element (3) centrum the place ahead, upstream pressure guide hole (5) is set, on measuring tube (4) tube wall at tapered throttling element (3) centrum rear, downstream pressure guide hole (14) is set, upstream pressure guide hole (5) is connected with the high-pressure side of differential pressure transmitter (7) by connecting pipe (6), and downstream pressure guide hole (14) is connected with the low pressure end of differential pressure transmitter (7) by connecting pipe (6); Differential pressure transmitter (7) is connected with flow integrator (15) with vortex signal amplifier (12).
2. differential pressure type mass flowmeter for vortex street according to claim 1 is characterized in that, the axis of described tapered throttling element (3) overlaps with the axis of measuring tube (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201575918U CN201413167Y (en) | 2009-05-26 | 2009-05-26 | Differential pressure type vortex mass flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201575918U CN201413167Y (en) | 2009-05-26 | 2009-05-26 | Differential pressure type vortex mass flow meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201413167Y true CN201413167Y (en) | 2010-02-24 |
Family
ID=41715050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201575918U Expired - Fee Related CN201413167Y (en) | 2009-05-26 | 2009-05-26 | Differential pressure type vortex mass flow meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201413167Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107664524A (en) * | 2017-09-23 | 2018-02-06 | 新疆中元天能油气科技股份有限公司 | One-piece type vortex street throttle type gas-liquid biphase flowmeter |
-
2009
- 2009-05-26 CN CN2009201575918U patent/CN201413167Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107664524A (en) * | 2017-09-23 | 2018-02-06 | 新疆中元天能油气科技股份有限公司 | One-piece type vortex street throttle type gas-liquid biphase flowmeter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100224 Termination date: 20120526 |