CN204154341U - A kind of multi-hole orifice of differential pressure flow sensor - Google Patents
A kind of multi-hole orifice of differential pressure flow sensor Download PDFInfo
- Publication number
- CN204154341U CN204154341U CN201420514909.4U CN201420514909U CN204154341U CN 204154341 U CN204154341 U CN 204154341U CN 201420514909 U CN201420514909 U CN 201420514909U CN 204154341 U CN204154341 U CN 204154341U
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- Prior art keywords
- hole orifice
- differential pressure
- orifice
- hole
- utility
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Abstract
The utility model relates to a kind of multi-hole orifice of differential pressure flow sensor, comprise one piece for being arranged on the multi-hole orifice on closed conduit xsect, the center of multi-hole orifice is provided with four metering orifices, the diameter of four metering orifices is identical, and with the position distribution on square four summits at the center of multi-hole orifice, after adopting above technical scheme: the concrete beneficial effect of the utility model is: measuring accuracy is high, straight length requires short, range ratio is wide, permanent loss pressure is little, stain resistance is not easily stifled and applied widely, because the utility model has porous symmetrical structure feature, balance rectification can be carried out by stream field, reduce eddy current, vibration and signal noise, flowing field stability improves greatly, the linearity is made to improve 5 ~ 10 times than conventional throttle device.
Description
Technical field
The utility model belongs to flow sensor field, is specifically related to a kind of multi-hole orifice of differential pressure flow sensor.
Background technology
Differential pressure type flow instrument of the prior art, usually choke block and cowling panel can be provided with successively at pipeline section place, usual choke block is that single hole arrangements is see Fig. 1, namely its flow is controlled, will according to the volumetric flow rate of reality to single hole (throttle orifice) area of choke block, mass rate and efflux coefficient, then Bernoulli equation is adopted to calculate, then cowling panel is thereafter that multiple hole is arranged on cowling panel, but owing to there are the words of two plates, there will be the situation of vibration and eddy current, namely the stability in flow field can significantly decline, and have dynamic loss of energy.
Summary of the invention
Technical problem to be solved in the utility model is: the multi-hole orifice providing a kind of differential pressure flow sensor.
For solving the problems of the technologies described above, the utility model by the following technical solutions:
A kind of multi-hole orifice of differential pressure flow sensor, comprise one piece for being arranged on the multi-hole orifice on closed conduit xsect, the center of multi-hole orifice is provided with four metering orifices, and the diameter of four metering orifices is identical, and with the position distribution on square four summits at the center of multi-hole orifice.
The hole area summation of four metering orifices equals the area of throttle orifice.
After adopting above technical scheme: the concrete beneficial effect of the utility model is: measuring accuracy is high, straight length requirement is short, range ratio is wide, permanent loss pressure is little, stain resistance is not easily stifled and applied widely, because the utility model has porous symmetrical structure feature, balance rectification can be carried out by stream field, reduce eddy current, vibration and signal noise, flowing field stability improves greatly, makes the linearity improve 5 ~ 10 times than conventional throttle device.
Accompanying drawing explanation
Fig. 1 is the structural representation of prior art Plays choke block;
Fig. 2 is structural representation of the present utility model.
Embodiment
See Fig. 2, a kind of multi-hole orifice of differential pressure flow sensor, comprise one piece for being arranged on the multi-hole orifice 1 on closed conduit xsect, the center of multi-hole orifice 1 is provided with four metering orifices 2, the diameter of four metering orifices 2 is identical, and with the position distribution on square four summits at the center of multi-hole orifice 1.
All parts of the present utility model is explained: the hole area summation of four metering orifices 2 equals the area of throttle orifice 3, require that parameter calculates gained by the mass rate of Bernoulli equation needed for reality, volumetric flow rate and efflux coefficient etc., here the throttle orifice 3 occurred is see Fig. 1, the throttle orifice 3 of the choke block 4 namely mentioned in background technology, the area of this throttle orifice 3 own is calculated by Bernoulli equation, namely needs to set according to the actual requirements.
Principle of work of the present utility model: multi-hole orifice disclosed in the utility model is also one of parts of differential pressure type flow instrument, the principle of work changing differential pressure type flow instrument is the same with other differential pressure flowmeter, is all based on the energy conversion principle in closed conduit: when ideal fluid, ducted flow is directly proportional to the square root of differential pressure ratio, ducted flow can be calculated according to Bernoulli equation with measuring differential pressure value, the utility model is with the difference of other differential pressure type flow instrument, multi-hole orifice is the disk throttling rectifier of a porous, namely choke block and cowling panel is incorporated, be arranged on the cross section of pipeline, when fluid passes the rectification hole of disk, fluid will be balanced rectification, eddy current is minimized, form approximate ideal fluid, pass through pressure obtaning device, stable differential pressure signal can be obtained, volumetric flow rate is calculated according to Bernoulli equation, mass rate, as a kind of differential pressure type flow instrumentation, the differential pressure type flow instrument that multi-hole orifice loads has identical measuring principle with the differential pressure type flow instrument that standard orifice plate throttling is loaded, difference is that porous rectifier and standard orifice plate are integrated into the disk throttling rectifier of a porous by multi-hole orifice, realize throttling and rectification integration, form the multi-hole orifice restriction device that multi-series is provided by different vendor.
The beneficial effects of the utility model:
1. measuring accuracy is high, because multi-hole orifice flow sensor has porous symmetrical structure feature, balance rectification can be carried out by stream field, reduce eddy current, vibration and signal noise, flowing field stability improves greatly, makes the linearity improve 5 ~ 10 times than conventional throttle device.
2. straight length requires short, and flow field rectification can be stablized and fast 2 times of pressure recovery ratio conventional throttle device by multi-hole orifice flow sensor, substantially reduces the requirement to straight length.Generally straight length requires as front 2D, rear 2D, thus saves a large amount of straight length, the especially pipeline of the material of special expensive.
3. range ratio is wide, and multi-hole orifice flowmeter under normal circumstances range ratio is 15: 1, selects suitable parameter to accomplish 30: 1, and the β value scope of multi-hole orifice flowmeter is 0.25 ~ 0.90.
4. permanent loss pressure is little, the balanced design of multi-hole orifice flowmeter porous symmetry, decreases the formation of eddy current and the friction of turbulent flow, reduces dynamic loss of energy; In the same differential pressure value situation of generation, permanent compression loss is about 1/3 of conventional throttle device, and saving sizable operation cost, is a kind of energy-saving instrument.
5. stain resistance not easily blocks up, the balanced design of multi-hole orifice flowmeter porous symmetry, decrease the formation of eddy current and the friction of turbulent flow, reduce dead band, flow field, ensure dirty medium smoothly by function hole, therefore multi-hole orifice flowmeter can be used for measuring various dirty medium, as coke gas, blast furnace gas, residual oil, recycle stock, coal water mixture etc.
6. applied widely, multi-hole orifice flow measurement weight range is extremely wide, can survey various gas, liquid, steam; Fluid condition can from profound hypothermia to supercriticality, and process temperature is up to 850 DEG C, and maximum working pressure (MWP) can reach 42MPa.
Actual working condition requirement:
1. line size: 15≤DN≤1200mm
2. nominal pressure: PN≤42MPa
3. working temperature: 50 DEG C≤t≤550 DEG C
4. range ratio: 1: 10,1: 15
5. accuracy class: 0.5 grade, 1 grade, 1.5 grades
6. reference standard: GB/T2624-2006, JJG640-94 and " flow measurement differential pressure producer design manual "
7. connected mode: Flange joint, weld, be threaded.
Claims (2)
1. the multi-hole orifice of a differential pressure flow sensor, comprise one piece for being arranged on the multi-hole orifice (1) on closed conduit xsect, it is characterized in that: the center of described multi-hole orifice (1) is provided with four metering orifices (2), the diameter of described four metering orifices (2) is identical, and with the center of the position distribution on square four summits in multi-hole orifice (1).
2. the multi-hole orifice of a kind of differential pressure flow sensor according to claim 1, is characterized in that: the hole area summation of described four metering orifices (2) equals the area of throttle orifice.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420514909.4U CN204154341U (en) | 2014-08-27 | 2014-08-27 | A kind of multi-hole orifice of differential pressure flow sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420514909.4U CN204154341U (en) | 2014-08-27 | 2014-08-27 | A kind of multi-hole orifice of differential pressure flow sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204154341U true CN204154341U (en) | 2015-02-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420514909.4U Expired - Fee Related CN204154341U (en) | 2014-08-27 | 2014-08-27 | A kind of multi-hole orifice of differential pressure flow sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204154341U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109253767A (en) * | 2017-07-14 | 2019-01-22 | 国家电投集团科学技术研究院有限公司 | Without external straight tube and the small compact flowmeter of installation space |
-
2014
- 2014-08-27 CN CN201420514909.4U patent/CN204154341U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109253767A (en) * | 2017-07-14 | 2019-01-22 | 国家电投集团科学技术研究院有限公司 | Without external straight tube and the small compact flowmeter of installation space |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150211 Termination date: 20160827 |