CN201166671Y - Low wind speed reverse-blowing block-resistant speed measurement apparatus - Google Patents
Low wind speed reverse-blowing block-resistant speed measurement apparatus Download PDFInfo
- Publication number
- CN201166671Y CN201166671Y CNU2008200846138U CN200820084613U CN201166671Y CN 201166671 Y CN201166671 Y CN 201166671Y CN U2008200846138 U CNU2008200846138 U CN U2008200846138U CN 200820084613 U CN200820084613 U CN 200820084613U CN 201166671 Y CN201166671 Y CN 201166671Y
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- leeward
- wind
- pipe
- spiral duct
- high resistant
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- Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
Abstract
The utility model discloses a speed measuring device which can prevent blockage by back blowing at a low wind-speed. A windward side pressure sensing hole is formed at the lower end of a windward tube, a pressure outlet is formed on the upper side surface, a back blowing wind inlet is formed at the upper end, an inlet is formed at one end of a windward side high-resistance spiral duct, an outlet is formed at the other end, and the outlet of the windward side high-resistance spiral duct is connected with the back blowing wind inlet of the windward tube; a leeward side pressure sending hole is formed at the lower end of a leeward tube, a pressure outlet is formed on the upper side surface, a back blowing wind inlet is formed at the upper end, an inlet is formed at one end of a leeward side high-resistance spiral duct, an outlet is formed at the other end, and the outlet of the leeward side high-resistance spiral duct is connected with the back blowing wind inlet of the leeward tube; the pressure outlets of the windward tube and the leeward tube are respectively connected with a differential pressure gauge. After entering the high-resistance spiral duct respectively and being decompressed, compressed air with the same flux is respectively blown into the windward tube and the leeward tube, both of which are close to a backrest tube, so as to carry out the real-time back blow to the pressure sensing holes. The device can carry out the real-time soot blow during the speed measuring process; the use is convenient; the measuring accuracy can be improved; and the service life of the device can be prolonged.
Description
Technical field
The utility model relates to a kind of velocity measuring device, particularly relate to the anti-blocking speed measuring device of a kind of low wind speed blowback.
Background technology
In the velocity measuring device of gas-solid multiphase flow body, contain the ash grit that grades in the fluid owing to measure, when fluid enters measuring system, be easy to cause the pressure sensing hole of measurement mechanism to stop up, thus the accuracy that influence is measured.In case need to clean or change after pressure sensing hole stops up, normally after stopping to measure, just can carry out, cause work efficiency to reduce like this.In present measuring technique, some design of measuring system has the batch (-type) back-blowing device, promptly connecting pipe is done regularly or irregularly to purge to prevent that pressure sensing hole from stopping up.This intermission type artificial back-blowing device need stop instrument operation when blowback, then cause the interruption of measuring, and must manually get involved, and increases maintenance load, and careless manipulation will damage differential pressure transmitter.In view of the above problems, the utility model adopts low wind speed back-flushing technique, in the velocity survey process fluid in the measuring tube is hanged down the wind speed real-time continuous and oppositely purges, thereby prevent that effectively pressure sensing hole from stopping up, and reduces measuring error, prolongs the surveying instrument life-span.Test and calculate with FLUENT and to show that all when the blowback wind speed was 0.5～2m/s, the error of this measurement mechanism was no more than 2%.
Summary of the invention
At the problem of above existence, the purpose of this utility model provides the anti-blocking speed measuring device of a kind of low wind speed blowback.
The technical solution adopted in the utility model is:
Comprise backing tube, windward side high resistant spiral duct, leeward side high resistant spiral duct and differential pressure gauge, backing tube is made up of facing the wind pipe and leeward pipe; Manage the lower end down with the wind and have the windward side pressure sensing hole, upper side has pipe pressure outlet down with the wind, the upper end has and manages blowback wind inlet down with the wind, one end of windward side high resistant spiral duct is a windward side high resistant spiral duct inlet, the other end is windward side high resistant spiral duct outlet, the outlet of windward side high resistant spiral duct with manage blowback wind down with the wind and enter the mouth and be connected; Leeward pipe lower end has the leeward side pressure sensing hole, upper side has leeward pipe pressure outlet, the upper end has leeward pipe blowback wind inlet, one end of leeward side high resistant spiral duct is a leeward side high resistant spiral duct inlet, the other end is the outlet of leeward side high resistant spiral duct, and the outlet of leeward side high resistant spiral duct is connected with leeward pipe blowback wind inlet; The pipe pressure that facings the wind exports and the outlet of leeward pipe pressure connects differential pressure gauge respectively.
The pipe that facings the wind of described backing tube is all identical with length, diameter, material and the internal drag of leeward pipe.
Described two high resistant spiral ducts, its caliber, length are identical, and the internal friction resistance is big, and resistance equates.
Described two high resistant spiral ducts, compressed-air actuated flow is identical, and pressure is 0.5～0.7MPa; The blowback speed that enters when facining the wind pipe and leeward pipe equates that size is 0.5～2m/s.
Compare with background technology, the beneficial effect that the utlity model has is:
The utility model can blow ash immediately in the velocity survey process, improved measuring accuracy, has prolonged instrument serviceable life; In addition, test the speed mode and the backing tube of the present utility model mode that tests the speed is identical, easy to use.
Description of drawings
Accompanying drawing is the low anti-blocking speed measuring device structural representation of wind speed blowback of the utility model.
Among the figure: 1. windward side pressure sensing hole, 2. backing tube, pipe 3. facings the wind, 4. the pipe pressure that facings the wind exports, and 5. manages blowback wind inlet down with the wind, 6. windward side high resistant spiral duct inlet, 7. windward side high resistant spiral duct, 8. windward side high resistant spiral duct outlet, 9. leeward side high resistant spiral duct outlet, 10. leeward side high resistant spiral duct, 11. leeward side high resistant spiral ducts inlet, 12. leeward pipe blowback wind inlets, 13. leeward pipe pressure interface, 14. differential pressure gauge, 15. leeward pipes, 16. leeward side pressure sensing holes.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described.
As shown in drawings, the utility model comprises backing tube 2, windward side high resistant spiral duct 7, leeward side high resistant spiral duct 10 and differential pressure gauge 14, backing tube 2 by manage down with the wind 3 and leeward pipe 15 form; Manage 3 lower ends down with the wind and have windward side pressure sensing hole 1, upper side has pipe pressure outlet 4 down with the wind, the upper end has and manages blowback wind inlet 5 down with the wind, one end of windward side high resistant spiral duct 7 is a windward side high resistant spiral duct inlet 6, the other end is windward side high resistant spiral duct outlet 8, windward side high resistant spiral duct outlet 8 with manage blowback wind down with the wind and enter the mouth and 5 be connected; Leeward pipe 15 lower ends have leeward side pressure sensing hole 16, upper side has leeward pipe pressure outlet 13, the upper end has leeward pipe blowback wind inlet 12, one end of leeward side high resistant spiral duct 10 is a leeward side high resistant spiral duct inlet 11, the other end is leeward side high resistant spiral duct outlet 9, and leeward side high resistant spiral duct outlet 9 is connected with leeward pipe blowback wind inlet 12; Pipe pressure outlet 4 and leeward pipe pressure outlet 13 connect differential pressure gauge 14 respectively down with the wind.
Managing down with the wind of described backing tube 2 is 3 all identical with length, diameter, material and the internal drag of leeward pipe 15.Described two high resistant spiral ducts, its caliber, length are identical, and the internal friction resistance is big, and resistance equates.Described two high resistant spiral ducts, compressed-air actuated flow is identical, and pressure is 0.5～0.7MPa; The blowback speed that enters when facining the wind pipe and leeward pipe equates that size is 0.5～2m/s.
Principle of work of the present utility model is as follows:
((0.5～0.7MPa) from leeward side high resistant spiral duct inlet 11 inflow leeward side high resistant spiral ducts 10 for 0.5～0.7MPa) pressurized air from windward side high resistant spiral duct inlet 6 inflow windward side high resistant spiral ducts 7, other one tunnel equal flow for one road pressurized air.After the step-down of high resistant spiral duct, flow velocity is that the pressurized air of 0.5～2m/s enters and manages 3 down with the wind by managing blowback wind inlet 8 down with the wind, and the pressurized air of identical flow velocity enters leeward pipe 15 by leeward pipe blowback wind inlet 12.In measuring process, detected fluid come flow path direction A perpendicular to backing tube 2, detected fluid enters differential pressure gauge 14 via facing the wind pipe pressure outlet 4 and leeward pipe pressure outlet 13,0.5 after the step-down of the pressurized air of～0.7MPa process high resistant spiral duct, enter and manage 3 and leeward pipe 15 down with the wind, pressure sensing hole is carried out reverse real-time continuous purge (wind speed 0.5～2m/s).
Because the frictional resistance of high resistant spiral duct inside is big, makes most pressure drops of blowback air all be consumed in the high resistant spiral duct, the blowback air manage down with the wind 3 and the pressure drop of leeward pipe 15 inside very little, can ignore.Test and calculate with FLUENT and to show that all when the blowback wind speed is 0.5～2m/s, compare with normal backing tube speed measuring device, the error of this measurement mechanism is no more than 2%.
Claims (4)
1, the anti-blocking speed measuring device of a kind of low wind speed blowback, it is characterized in that: comprise backing tube (2), windward side high resistant spiral duct (7), leeward side high resistant spiral duct (10) and differential pressure gauge (14), backing tube (2) is made up of facing the wind pipe (3) and leeward pipe (15); Pipe (3) lower end has windward side pressure sensing hole (1) down with the wind, upper side has pipe pressure outlet (4) down with the wind, the upper end has and manages blowback wind inlet (5) down with the wind, one end of windward side high resistant spiral duct (7) is a windward side high resistant spiral duct inlet (6), the other end is windward side high resistant spiral duct outlet (8), windward side high resistant spiral duct outlet (8) with manage down with the wind blowback wind enter the mouth (5) be connected; Leeward pipe (15) lower end has leeward side pressure sensing hole (16), upper side has leeward pipe pressure outlet (13), the upper end has leeward pipe blowback wind inlet (12), one end of leeward side high resistant spiral duct (10) is a leeward side high resistant spiral duct inlet (11), the other end is leeward side high resistant spiral duct outlet (9), and leeward side high resistant spiral duct outlet (9) is connected with leeward pipe blowback wind inlet (12); Pipe pressure outlet (4) and the leeward pipe pressure outlet (13) of facining the wind connects differential pressure gauge (14) respectively.
2, the anti-blocking speed measuring device of a kind of low wind speed blowback according to claim 1 is characterized in that: the pipe (3) that facings the wind of described backing tube (2) is all identical with length, diameter, material and the internal drag of leeward pipe (15).
3, the anti-blocking speed measuring device of a kind of low wind speed blowback according to claim 1 is characterized in that: described two high resistant spiral ducts, and its caliber, length are identical, and the internal friction resistance is big, and resistance equates.
4, the anti-blocking speed measuring device of a kind of low wind speed blowback according to claim 1 is characterized in that: described two high resistant spiral ducts, and compressed-air actuated flow is identical, and pressure is 0.5～0.7MPa; The blowback speed that enters when facining the wind pipe and leeward pipe equates that size is 0.5～2m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200846138U CN201166671Y (en) | 2008-03-25 | 2008-03-25 | Low wind speed reverse-blowing block-resistant speed measurement apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200846138U CN201166671Y (en) | 2008-03-25 | 2008-03-25 | Low wind speed reverse-blowing block-resistant speed measurement apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201166671Y true CN201166671Y (en) | 2008-12-17 |
Family
ID=40192061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200846138U Expired - Fee Related CN201166671Y (en) | 2008-03-25 | 2008-03-25 | Low wind speed reverse-blowing block-resistant speed measurement apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201166671Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102033140A (en) * | 2010-10-25 | 2011-04-27 | 中南大学 | Elbow type backrest tube |
-
2008
- 2008-03-25 CN CNU2008200846138U patent/CN201166671Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102033140A (en) * | 2010-10-25 | 2011-04-27 | 中南大学 | Elbow type backrest tube |
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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: 20081217 |