CN201072346Y - Novel differential pressure type flow measuring device - Google Patents
Novel differential pressure type flow measuring device Download PDFInfo
- Publication number
- CN201072346Y CN201072346Y CNU2007201696148U CN200720169614U CN201072346Y CN 201072346 Y CN201072346 Y CN 201072346Y CN U2007201696148 U CNU2007201696148 U CN U2007201696148U CN 200720169614 U CN200720169614 U CN 200720169614U CN 201072346 Y CN201072346 Y CN 201072346Y
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- CN
- China
- Prior art keywords
- differential pressure
- pressure type
- type flow
- flow meter
- convergent contour
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Abstract
The utility model provides a pressure differential flow measuring device which comprises a regular speed tube and a sensor thereof and is characterized in that the pressure differential flow measuring device also comprises a central unit body arranged inside the regular speed tube and that a converging flow passage for increasing flow rate and axially provided with detection through holes on the side wall of the converging end is arranged inside the central unit body. The utility model is characterized by high measurement precision, low pressure loss and effective energy conservation.
Description
Technical field
The utility model relates to the fluid measurement technical field, particularly a kind of novel differential pressure type flow measurement device.
Background technology
Orifice-plate type and even speed tube (also being Annubar) are the present industrial differential pressure type flow measuring apparatus that is most widely used.
Orifice-plate flowmeter, its advantage is the measuring accuracy height, be about ± 1.5%, and low price, and standardization and seriation, its efflux coefficient C, expansion coefficient Y and Reynolds number modified value F
KAll set up sufficient database, but that its shortcoming is the pressure loss is big, energy consumption is high.
Even speed tube (Annubar) flowmeter accuracy is suitable with orifice-plate type, and simple installation, the pressure loss little (therefore energy-conservation and broaden the scope of work), but its major defect is under low speed flox condition, its differential pressure signal Δ P* (is P
0-P ') lower, so antijamming capability is very poor when measuring.
The Annular Round Model PFB of Rosemount (ROSEMOUNT) company development, its main development trend manages to strengthen differential pressure signal Δ P* exactly, the 5th generation of its up-to-date Annubar (Annubar) is a T shape bar, and its differential pressure signal Δ P* can strengthen about 40% than the rhombus bar in the 4th generation.
The utility model then be by existing the 4th generation Annular Round Model PFB the basis on the center position of rhombus bar is provided with in, flow diffuser, to constitute the air pressure drop amplifier of in-flow, thereby reach the purpose that enlarges differential pressure signal Δ P*, utilize this in-flow diffuser further to increase about one times of differential pressure signal Δ P* than the 5th generation of Annubar.
The utility model content
The purpose of this utility model is to provide a kind of differential pressure type flow meter novel, that can significantly strengthen differential pressure signal Δ P*, the differential pressure type flow measurement method that utilizes the utility model to provide, can be on the basis of existing Annubar flow-measuring method and device, significantly strengthen differential pressure signal Δ P*, and the reduction pressure loss, reach and improve work efficiency, energy saving purposes.
The technical solution of the utility model is as follows:
A kind of differential pressure type flow meter, comprise even speed tube and sensor thereof, it is characterized in that: described differential pressure type flow meter also comprises the center cell body that is arranged in the described even speed tube, be provided with the convergence divergent contour runner that increases rate of flow of fluid in the described center cell body, the distolateral wall of convergence of described convergence divergent contour runner radially is provided with to survey uses through hole.
Described convergent contour runner is the gradually little horn-like passage of radial dimension.
Its longitudinal cross-section of described convergent contour runner is the horn-like curved section of symmetry.
Be extended with the diffuser that reduces the fluid resistance to outflow behind the described convergent contour runner, described diffuser is the gradually big horn-like passage of bore.
Described convergent contour runner and diffuser joining part are throat, and described throat is isometrical straight length.
The wall of described throat is provided with the through hole in order to flowing pressure in surveying.
Described average rate body is by two
The rhombus bar structure that shape shaft interior angle is spliced relatively.
Described average rate body also comprises a back up pad, described two
Its cross-sectional sizes difference of shape shaft, and be individually fixed in this back up pad both sides, described center cell body is arranged in the rhombus bar.
Technique effect of the present utility model is as follows:
The utility model is provided with the convergent contour runner by being provided with independently as the center cell body of differential pressure of flow amplifier in the described center cell body in even speed tube, the distolateral wall of the convergence of described runner radially is provided with the through hole that joins with sensor.
Differential pressure type flow meter of the present utility model can utilize the reducing-pitch thread runner that is provided with in the center cell body owing to adopt the independent center cell body that is provided with, and plays the effect that improves fluid velocity, thereby significantly improves differential pressure signal Δ P*, reduces the pressure loss.
Be extended with the diffuser that reduces the fluid resistance to outflow behind the inherent convergent contour runner of center cell body simultaneously of the present utility model, described diffuser is the gradually big horn-like passage of bore.Fluid is after the convergent contour runner increases flow velocity, diffuser through thereafter is organized into linear fluid rapidly with disorderly attitude fluid, makes further to improve differential pressure signal Δ P* by the resistance that fluid was subjected to when fluid stable and minimizing were flowed out, reduce the pressure loss, help improving the precision of flow measurement.
Detect as can be known through experiment, the measured signal differential pressure Δ P* of measurement mechanism of the present utility model improves 100%-200% than existing even speed tube measuring method, and the corresponding pressure loss of measuring that reduces, have the raising effect of highly significant, the technique effect of energy-conservation of consumption reduction.
The convergence flow field end of center cell body of the present utility model inside is provided with the expansion head piece that bore is dispersed, and can improve the performance that fluid flows out, and further reduces the pressure loss, improves differential pressure signal Δ P*.
Description of drawings
Fig. 1 is the structural representation of the utility model differential pressure type flow meter;
Fig. 2 is the A-A sectional view of Fig. 1.
Embodiment
Below in conjunction with accompanying drawing the utility model is described further.
Be the specific embodiment of a kind of novel differential pressure type flow measurement device provided by the utility model as illustrated in fig. 1 and 2.
The relative perforate in tested pipeline 1 both sides, tapping is respectively arranged with base 5, and wherein an end base 5 usefulness cap seals close, and the other end is in order to insert even speed tube 2 and to be connected with even speed tube 2 end flange.
Even speed tube 2 comprises a rhombus bar works, and the rhombus bar is made up of little sidewall 201, upper wall 202, big sidewall 203 and lower wall 204, and little sidewall 201, upper wall 202, big sidewall 203 and lower wall 204 are
The shaft of tee section, even speed tube 2 comprises a back up pad 205, back up pad 205 centres are fixed with an independent center cell body 6 that is provided with, little sidewall 201, upper wall 202, big sidewall 203 and lower wall 204 are the center with center cell body 6 successively, be spliced into rhombus bar structure in the relative mode of interior angle, wherein be respectively arranged with one group of through hole 3 on upper wall 202 and lower wall 204 walls.
The structure of center cell body 6 is made up of two pairs of side plates that are oppositely arranged 602 and end plate 601, side plate 602 is inboard to form a convergent runner with two end plates 601 up and down, the runner leading portion is a bore convergent convergent contour runner, and its longitudinal cross-section of convergent contour runner is the horn-like curved section of symmetry in the present embodiment.Convergent contour runner rear end straight line extends into the throat of square-section, the wall of throat is provided with the through hole 7 in order to flowing pressure in surveying, throat's end is the gradually big horn-like diffuser of bore, this spline structure can realize that rhombus bar inner fluid quickens and rectification when the convergent contour runner enters throat, and reduces the pressure loss when diffuser flows out.
Differential pressure type flow meter of the present utility model is compared existing Annubar flow measurement device can significantly improve differential pressure signal, increases the adjusting ratio of measurement mechanism, improves measuring accuracy, reduces the pressure loss, has obvious energy-saving effect.
For the present embodiment, sensor is conventional signal measurement means, and its installation and use are conventionally known to one of skill in the art, so are not described in detail in the present embodiment.
The above only is a preferred implementation of the present utility model.Should be pointed out that for a person skilled in the art,, can also make other modification and improvement, but these modification and improvement all will fall into protection domain of the present utility model according to technical spirit of the present utility model.
Claims (8)
1. a differential pressure type flow meter comprises even speed tube and sensor thereof,, it is characterized in that:
Described differential pressure type flow meter also comprises the center cell body that is arranged in the described even speed tube, is provided with the convergent contour runner that increases rate of flow of fluid in the described center cell body, and the distolateral wall of the convergence of described convergent contour runner radially is provided with to survey uses through hole.
2. differential pressure type flow meter as claimed in claim 1 is characterized in that: described convergent contour runner is the gradually little horn-like passage of radial dimension.
3. differential pressure type flow meter as claimed in claim 2 is characterized in that: its longitudinal cross-section of described convergent contour runner is the horn-like curved section of symmetry.
4. differential pressure type flow meter as claimed in claim 2 is characterized in that: be extended with the diffuser that reduces the fluid resistance to outflow behind the described convergent contour runner, described diffuser is the gradually big horn-like passage of bore.
5. differential pressure type flow meter as claimed in claim 4 is characterized in that: described convergent contour runner and diffuser joining part are throat, and described throat is isometrical straight length.
6. differential pressure type flow meter as claimed in claim 5 is characterized in that: the wall of described throat is provided with the through hole in order to flowing pressure in surveying.
7. differential pressure type flow meter as claimed in claim 6 is characterized in that: described average rate body is by two
The rhombus bar structure that shape shaft interior angle is spliced relatively.
8. differential pressure type flow meter as claimed in claim 7 is characterized in that: described average rate body also comprises a back up pad, described two
Its cross-sectional sizes difference of shape shaft, and be individually fixed in this back up pad both sides, described center cell body is arranged in the rhombus bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201696148U CN201072346Y (en) | 2007-07-09 | 2007-07-09 | Novel differential pressure type flow measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201696148U CN201072346Y (en) | 2007-07-09 | 2007-07-09 | Novel differential pressure type flow measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201072346Y true CN201072346Y (en) | 2008-06-11 |
Family
ID=39550904
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201696148U Expired - Lifetime CN201072346Y (en) | 2007-07-09 | 2007-07-09 | Novel differential pressure type flow measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201072346Y (en) |
-
2007
- 2007-07-09 CN CNU2007201696148U patent/CN201072346Y/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080611 |
|
| CX01 | Expiry of patent term |