CN102830244B - Flow velocity measuring device with pitot tube - Google Patents
Flow velocity measuring device with pitot tube Download PDFInfo
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- CN102830244B CN102830244B CN201210331078.2A CN201210331078A CN102830244B CN 102830244 B CN102830244 B CN 102830244B CN 201210331078 A CN201210331078 A CN 201210331078A CN 102830244 B CN102830244 B CN 102830244B
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Abstract
The invention discloses a flow velocity measuring device with a pitot tube. The flow velocity measuring device with the pitot tube comprises two control valves, wherein the first port of each of the two control valves is connected with a differential pressure transmitter, the second port of each of the two control valves is connected with the pitot tube, and the third port of each of the two control valves is connected with a compressed air source; the flow velocity measuring device with the pitot tube further comprises a timer, wherein an output contact of the timer is connected with an input contact of each of the two control valves; settings of the timer comprises the setting of a control cycle and the setting of the duration of each time; in other words, the control on the frequency for purging the pitot tube and each purging time can be realized. In this way, the time and the frequency for purging can be controlled by the timer; when purging parameters are changed, the settings of the timer are modified simply; meanwhile, the purging control process is simple relatively, and the purging frequency can be modified more conveniently when working conditions are changed. Therefore, the operating difficulty of the device is reduced.
Description
Technical field
The present invention relates to flue gas monitoring field, particularly relate to a kind of Pitot Tube Flow Velocity Measuring Apparatus.
Background technology
Along with improving constantly of people's environmental consciousness, various gaseous contamination accidents have obtained national great attention, contamination accident be to destroy ecologic environment, threaten the hazards of human health; Based on the current Environmental Pollution of China, develop can field monitoring gas index instrument, hazardous gas content is monitored in real time, promote environment risk identification, assessment, prevention, emergency disposal level extremely urgent.
Exhaust gas volumn is the important indicator of calculating pollutant discharge amount and implementing overall control, and measuring flue gas flow rate is requisite process while calculating pollutant discharge amount.Pitot tube method is to measure flue gas flow rate topmost method, in this kind of method, keep just clean to air-flow gaging hole surface of pitot tube, can guarantee to measure the accuracy of flue gas flow rate, therefore needs regular blowback pitot tube, to guarantee the clean of pitot tube.
Existing Pitot Tube Flow Velocity Measuring Apparatus comprises pitot tube, compressed air line, control solenoid valve, little differential pressure sensor and signal processing circuit thereof etc.Pressurized air main line is divided into two-way bye-pass, is connected respectively by a three-way solenoid valve with the positive and negative piezometric tube of pitot tube, T-valve has two, and one of them T-valve one port is connected by the positive pressure tap of pipeline and little differential pressure sensor, and a port is connected by the positive piezometric tube of pipeline and pitot tube, also has a port to be communicated with atmosphere, another T-valve one port is connected by the negative pressure tap of pipeline and little differential pressure sensor, one port is connected by the negative piezometric tube of pipeline and pitot tube, also have a port to be communicated with atmosphere, just realize pitot tube, the purging respectively of negative piezometric tube, the insulation blocking function of little differential pressure sensor and high pressure air while simultaneously realizing purging, flow rate measuring device is as the part in fume continuous monitoring system, the break-make of above-mentioned solenoid valve is to control by the PLC in fume continuous monitoring system switch board, in PLC program, set in advance blowback frequency and realize the purging to pitot tube.
In above-mentioned Pitot Tube Flow Velocity Measuring Apparatus, the break-make of solenoid valve is controlled by outside PLC, purge frequency and generally in the time dispatching from the factory, set in advance, but in use, purging frequency need to reset according to on-the-spot design conditions or empirical data, when field working conditions changes, such as dustiness is when larger, need to change blowback frequency, now, need to change program lay equal stress on and newly downloadedly in PLC, can realize the change that purges frequency, operation is comparatively complicated; In addition, the source purge gas of Pitot Tube Flow Velocity Measuring Apparatus is pressurized air, each purge time is generally 5s～10s, when purging, can pop one's head in by cooling pitot tube, the temperature reduction of pitot tube probe causes flue gas to enter pitot tube formation condensation, owing to containing the gases such as sulphuric dioxide in flue gas, after condensation, form acid, easily corrode pitot tube.
Therefore, how to simplify the purging control procedure of Pitot Tube Flow Velocity Measuring Apparatus, make in the time that operating mode changes, purging frequency can more easily change thereupon, reduces the operation easier of device, needs the problem of solution with regard to becoming those skilled in the art badly.
Summary of the invention
The object of this invention is to provide a kind of Pitot Tube Flow Velocity Measuring Apparatus, it is comparatively simple that it purges control procedure, and in the time that operating mode changes, purging frequency can change comparatively easily, thereby reduced the operation easier of device.
Pitot Tube Flow Velocity Measuring Apparatus provided by the present invention, comprises two operation valves, and described in two, the first port of operation valve is all connected with differential pressure transmitter, and the second port is all connected with pitot tube, and the 3rd port is all connected with compressed air source; Also comprise timer, the output contact of described timer is connected with the input contact of operation valve described in two; Described in described compressed air source and two, between the 3rd port of operation valve, be provided with the gas-holder for pressurize; Preferably, the periphery of described gas-holder is provided with comb, passes into temperature higher than described compressed-air actuated heating medium in described comb.
Preferably, described timer is push button timer, and has display dial.
Preferably, also comprise casing, described operation valve, described differential pressure transmitter, described pitot tube, described compressed air reservoir and described timer are all arranged in described casing.
Preferably, in described casing, there is the trough that holds pressure unit, on described pitot tube, be provided with the pressure connector of described pressure unit.
Pitot Tube Flow Velocity Measuring Apparatus provided by the present invention comprises two operation valves, and described in two, the first port of operation valve is all connected with differential pressure transmitter, and the second port is all connected with pitot tube, and the 3rd port is all connected with compressed air source; This Pitot Tube Flow Velocity Measuring Apparatus also comprises timer, and the output contact of timer is connected with the input contact of two operation valves; Timer setting comprises two parts, a part arranges control cycle, and a part arranges each duration, can realize the frequency and the each time purging that purge pitot tube controlled, like this, the time purging by timer control and frequency, in the time that purging parameter changes, only need the setting of simple change timer, purge control procedure comparatively simple, in the time that operating mode changes, purging frequency can change comparatively easily, thereby has reduced the operation easier of device.
In a kind of embodiment, Pitot Tube Flow Velocity Measuring Apparatus provided by the present invention also comprises casing, and the parts such as operation valve, differential pressure transmitter, pitot tube, gas-holder and timer are all integrated in described casing; Like this, integrative installation technology has been determined the fed distance of purge gas between pitot tube and differential pressure transmitter, the variation of purge gas fed distance is only limited in outside equipment, can, because each on-the-spot different fed distance that make pitot tube and differential pressure transmitter change, not reduce because the variation of fed distance causes the large pressure loss and not reach effective blowback effect.
In another kind of embodiment, between the 3rd port of the compressed air source of Pitot Tube Flow Velocity Measuring Apparatus provided by the present invention and two operation valves, be provided with the gas-holder for pressurize, the periphery of this gas-holder is provided with comb, passes into temperature higher than compressed-air actuated heating medium in comb; Like this, by the heating medium in comb, to the pressurized air heating for purging pitot tube, temperature when pressurized air purges is higher, thereby has avoided cooling to pitot tube probe of pressurized air, the corrosion of the probe acid and alkali material of protection.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of embodiment of Pitot Tube Flow Velocity Measuring Apparatus provided by the present invention.
Embodiment
Core of the present invention is to provide a kind of Pitot Tube Flow Velocity Measuring Apparatus, and it is comparatively simple that it purges control procedure, and in the time that operating mode changes, purging frequency can change comparatively easily, thereby has reduced the operation easier of device.
In order to make those skilled in the art person understand better the present invention program, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 1, Fig. 1 is the structural representation of a kind of embodiment of Pitot Tube Flow Velocity Measuring Apparatus provided by the present invention.
Pitot Tube Flow Velocity Measuring Apparatus provided by the present invention comprises described in two operation valves 1, two that the first port of operation valve 1 is all connected with differential pressure transmitter 2, the second ports and is all connected with pitot tube 3, the three ports and is all connected with compressed air source 4; This Pitot Tube Flow Velocity Measuring Apparatus also comprises timer 5, and the output contact of timer 5 is connected with the input contact of two operation valves 1; Timer 5 arranges and comprises two parts, a part arranges control cycle, and a part arranges each duration, can realize the frequency and the each time purging that purge pitot tube 3 controlled, like this, control by timer 5 time and the frequency that purge, in the time that purging parameter changes, only need the setting of simple change timer 5, purge control procedure comparatively simple, in the time that operating mode changes, purging frequency can change comparatively easily, thereby has reduced the operation easier of device.
Above-mentioned operation valve 1 can be three-way solenoid valve, can be also the operation valve 1 of the conventional other types that use in this area, such as four way solenoid valve etc.
Particularly, above-mentioned timer 5 is installed on the electric component installing zone of Pitot Tube Flow Velocity Measuring Apparatus, be connected with 24V Switching Power Supply (220V input power is converted to 24V direct supply), and the output contact of timer 5, by terminal connected electromagnetic valve input contact, is used the action of the switch control solenoid valve of timer 5.
Above-mentioned timer 5 can be push button, simple to operate, and is with Presentation Function, and apparently, timer 5 is also not limited to push button, and it can be also conventional other forms that use in this area, such as knob etc.
Above-mentioned timer 5 can also have display dial, to show the information such as current traffic conditions.
Pitot Tube Flow Velocity Measuring Apparatus provided by the present invention also comprises casing 6, and the parts such as operation valve 1, differential pressure transmitter, pitot tube 3 and timer 5 are all integrated in described casing 6; Like this, integrative installation technology has been determined the fed distance of purge gas between pitot tube 3 and differential pressure transmitter 2, the variation of purge gas fed distance is only limited in outside equipment, can, because each on-the-spot different fed distance that make pitot tube 3 and differential pressure transmitter 2 change, not reduce because the variation of fed distance causes the large pressure loss and not reach effective blowback effect; Meanwhile, casing 6 can be realized protection to the parts of its inside, avoids its interior parts of external environmental.
Above-mentioned casing 6 can be cast iron materials, can be also conventional other metals or the nonmetallic materials that use in this area, such as aluminium alloy etc.
The external interface of offering on casing 6 comprises: the flange-interface of casing 6 bottoms, is connected by flange with flue side flange; Casing 6 cable interface below, for service cable, the connection of signal cable; The steam access port of casing 6 sides, steam outlet, pressurized air access port, offering of these external interfaces guaranteed the parts of casing 6 inside and extraneous normal connection, guaranteed the normal work of parts.
In above-mentioned casing 6, there is the trough 7 that holds pressure unit, and on pitot tube 3, be provided with the pressure connector being connected with this pressure unit, in the time that measuring flue pressure, needs can add pressure unit in this trough 7, and be connected with pitot tube 3 with four fluorine tube, thereby facilitate the repacking of device under different service conditions.
Between the compressed air source 4 of Pitot Tube Flow Velocity Measuring Apparatus provided by the present invention and the 3rd port of two operation valves 1, be provided with the gas-holder for pressurize, the periphery of gas-holder is provided with comb, passes into temperature higher than compressed-air actuated heating medium in comb; Like this, by the heating medium in comb, to the pressurized air heating for purging pitot tube 3, temperature when pressurized air purges is higher, thus avoided that pressurized air pops one's head in to pitot tube 3 cooling, the corrosion of the probe acid and alkali material of protection.
Above Pitot Tube Flow Velocity Measuring Apparatus provided by the present invention is described in detail.Applied specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Claims (4)
1. a Pitot Tube Flow Velocity Measuring Apparatus, comprises two operation valves (1), and the first port of operation valve described in two (1) is all connected with differential pressure transmitter (2), and the second port is all connected with pitot tube (3), and the 3rd port is all connected with compressed air source (4); It is characterized in that, also comprise timer (5), the output contact of described timer (5) is connected with the input contact of operation valve described in two (1); Described compressed air source (4) and be provided with the gas-holder for pressurize between the 3rd port of operation valve (1) described in two; The periphery of described gas-holder is provided with comb, passes into temperature higher than the compressed-air actuated heating medium in described compressed air source in described comb.
2. Pitot Tube Flow Velocity Measuring Apparatus according to claim 1, is characterized in that, described timer (5) is push button timer, and has display dial.
3. Pitot Tube Flow Velocity Measuring Apparatus according to claim 1, it is characterized in that, also comprise casing (6), described operation valve (1), described differential pressure transmitter (2), described pitot tube (3), described compressed air source and described timer (5) are all arranged in described casing (6).
4. Pitot Tube Flow Velocity Measuring Apparatus according to claim 3, is characterized in that, has the trough (7) that holds pressure unit in described casing (6), is provided with the pressure connector of described pressure unit on described pitot tube (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210331078.2A CN102830244B (en) | 2012-09-07 | 2012-09-07 | Flow velocity measuring device with pitot tube |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210331078.2A CN102830244B (en) | 2012-09-07 | 2012-09-07 | Flow velocity measuring device with pitot tube |
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| CN102830244A CN102830244A (en) | 2012-12-19 |
| CN102830244B true CN102830244B (en) | 2014-05-28 |
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| CN201210331078.2A Active CN102830244B (en) | 2012-09-07 | 2012-09-07 | Flow velocity measuring device with pitot tube |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109738665B (en) * | 2019-01-19 | 2020-12-01 | 重庆芯力源科技有限公司 | Pitot tube-based flow velocity automatic measurement method |
| CN110058047A (en) * | 2019-05-14 | 2019-07-26 | 哈尔滨工程大学 | Steam flow rate measuring system in a kind of runner |
| CN117538031B (en) * | 2023-10-11 | 2024-06-04 | 无锡宝丰电力设备有限公司 | Intelligent valve on-line monitoring system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2516944Y (en) * | 2001-12-25 | 2002-10-16 | 梁永 | Flow measuring device with Pitot tube |
| CN2672623Y (en) * | 2004-01-14 | 2005-01-19 | 华东电力试验研究院 | Automatic pumping device for wind amount measurer |
| CN202304904U (en) * | 2011-11-01 | 2012-07-04 | 北京雪迪龙科技股份有限公司 | Pitot tube flowmeter blowing device and Pitot tube flowmeter adopting same |
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2012
- 2012-09-07 CN CN201210331078.2A patent/CN102830244B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2516944Y (en) * | 2001-12-25 | 2002-10-16 | 梁永 | Flow measuring device with Pitot tube |
| CN2672623Y (en) * | 2004-01-14 | 2005-01-19 | 华东电力试验研究院 | Automatic pumping device for wind amount measurer |
| CN202304904U (en) * | 2011-11-01 | 2012-07-04 | 北京雪迪龙科技股份有限公司 | Pitot tube flowmeter blowing device and Pitot tube flowmeter adopting same |
Non-Patent Citations (2)
| Title |
|---|
| 增压吹扫安全防爆控制系统;孙公展;《炼油化工自动化》;19911231(第1（1991年）期);第14页，附图6 * |
| 孙公展.增压吹扫安全防爆控制系统.《炼油化工自动化》.1991,(第1（1991年）期),第14页，附图6. |
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