CN105486359A - Flow velocity and pressure integral measuring instrument using Pitot tube method - Google Patents
Flow velocity and pressure integral measuring instrument using Pitot tube method Download PDFInfo
- Publication number
- CN105486359A CN105486359A CN201510817759.3A CN201510817759A CN105486359A CN 105486359 A CN105486359 A CN 105486359A CN 201510817759 A CN201510817759 A CN 201510817759A CN 105486359 A CN105486359 A CN 105486359A
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- Prior art keywords
- pitot tube
- pressure
- measuring instrument
- detection module
- integral type
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/40—Details of construction of the flow constriction devices
- G01F1/46—Pitot tubes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention provides a flow velocity and pressure integral measuring instrument using a Pitot tube method. The flow velocity and pressure integral measuring instrument includes a Pitot tube, a sampling rod sleeved inside the Pitot tube, and a housing connected to the sampling rod. An input end of the Pitot tube is provided with a downward first inlet and an upward second inlet. An output end of the Pitot tube is provided with a first outlet and a second outlet. The first outlet communicates with the first inlet, and the second outlet communicates with the second inlet. A flow velocity detection module and a pressure detection module are arranged in the housing. The flow velocity detection module includes a differential pressure transmitter. A positive pressure end of the differential pressure transmitter is connected to the first outlet. A negative pressure end of the differential pressure transmitter is connected to the second outlet. The pressure detection module is connected to the first outlet of the Pitot tube.
Description
Technical field
The present invention relates to flue gas monitoring technical field, especially relate to a kind of velocity pressure integral type measuring instrument adopting pitot tube method.
Background technology
The discharge of industrial smoke in strict accordance with discharging standards, in order to detect the emissions status of industrial smoke, must occur that multiple different instrument is used for detecting the various detecting factor in flue gas emission.
Measure the temperature of the flue gas of industrial discharge, need to use special temperature-detecting device to measure.
Measure the pressure of the flue gas of industrial discharge, need to use special pressure-detecting device to measure.
Measure the flow velocity of the flue gas of industrial discharge, need to use special flow monitor to measure.
In prior art, in order to detect pressure and the flow velocity of flue gas, need the instrument that use two kinds is independent, integration degree is low, and testing process is complicated, at substantial material resources.
Summary of the invention
The object of the present invention is to provide a kind of velocity pressure integral type measuring instrument adopting pitot tube method, the pressure of flue gas and the technical matters of flow velocity can not be measured to solve prior art simultaneously.
The invention provides a kind of velocity pressure integral type measuring instrument adopting pitot tube method, comprise pitot tube, the thief rod be sheathed on described pitot tube, and the shell be connected with described thief rod;
The input end of described pitot tube is provided with the first import down and the second import upward; The output terminal of described pitot tube is provided with the first outlet and the second outlet, described first inlet communication of described first outlet, described second outlet and described second inlet communication;
Be provided with flow rate detection module and pressure detection module in described shell, described flow rate detection module comprises differential pressure transmitter, and the positive pressure side and described first of described differential pressure transmitter exports and is connected, and the negative pressure end and described second of described differential pressure transmitter exports and is connected;
Described pressure detection module exports with first of described pitot tube and is connected.
Further, described pressure detection module comprises and exports with first of described pitot tube the pressure transducer be connected.
Further, the velocity pressure integral type measuring instrument of described employing pitot tube method also comprises tee pipe coupling, described tee pipe coupling comprises first interface, the second interface and the 3rd interface, described first interface exports with first of described pitot tube and is connected, the positive press bond of described second interface and described differential pressure transmitter, described 3rd interface is connected with described pressure transducer.
Further, described first outlet is connected with described differential pressure transmitter by differential pressure delivery pipe; Described first outlet is connected with described pressure transducer by penstock.
Further, the velocity pressure integral type measuring instrument of described employing pitot tube method also comprises the temperature detecting module for detecting described thief rod temperature, and described temperature detecting module is connected with described thief rod.
Further, described temperature detecting module comprises temperature sensor, and the probe of temperature sensor is between the outer wall and the inwall of thief rod of pitot tube.
Further, the velocity pressure integral type measuring instrument of described employing pitot tube method also comprises signals collecting and output module, described signals collecting and output module respectively with described pressure detection module, described temperature detecting module and described pressure detection model calling, described signals collecting and output module are used for being connected with flue gas detecting system.
Further, be also provided with connection terminal in described shell, described signals collecting is connected with described connection terminal respectively with output module, described pressure detection module, described temperature detecting module and described pressure detection module.
Further, the first end of described thief rod stretches in chimney to be measured, and the second end of described thief rod is connected with flange, and described flange is used for being connected with chimney to be measured.
Further, the lower casing that described shell comprises upper casing and is connected with described upper casing, described lower casing is connected with described thief rod.
The velocity pressure integral type measuring instrument of employing pitot tube method provided by the invention comprises pitot tube, flow rate detection module and pressure detection module, flow rate detection module is connected with pitot tube respectively with pressure detection module, flow rate detection module measures the flow velocity of flue gas by the pressure reduction at pitot tube two ends, pressure detection module is by the pressure of the pressure survey flue gas in pitot tube first exit, as can be seen here, the present invention adopts pitot tube can measure flow velocity and the pressure of flue gas simultaneously, this integral type measuring instrument integration degree is low, testing process is simple, time saving and energy saving.
Accompanying drawing explanation
In order to be illustrated more clearly in the specific embodiment of the invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The structural representation of the velocity pressure integral type measuring instrument of the employing pitot tube method that Fig. 1 provides for the embodiment of the present invention.
Reference numeral:
1-pitot tube; 2-thief rod;
3-lower casing; 4-temperature detecting module;
5-flow rate detection module; 6-connection terminal;
7-pressure detection module; 8-upper casing;
9-tee pipe coupling.
Embodiment
Be clearly and completely described technical scheme of the present invention below in conjunction with accompanying drawing, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In describing the invention, it should be noted that, orientation or the position relationship of the instruction such as term " " center ", " on ", D score, "left", "right", " vertically ", " level ", " interior ", " outward " they be based on orientation shown in the drawings or position relationship; be only the present invention for convenience of description and simplified characterization; instead of instruction or imply the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second ", " the 3rd " only for describing object, and can not be interpreted as instruction or hint relative importance.Wherein, term " primary importance " and " second place " are two different positions.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.
The structural representation of the velocity pressure integral type measuring instrument of the employing pitot tube method that Fig. 1 provides for the embodiment of the present invention.
As shown in Figure 1, the invention provides a kind of velocity pressure integral type measuring instrument adopting pitot tube 1 method, this temperature and pressure stream monitor comprise pitot tube 1, the thief rod 2 be sheathed on described pitot tube 1, and the shell be connected with described thief rod 2; The input end of described pitot tube 1 is provided with the first import down and the second import upward; The output terminal of described pitot tube 1 is provided with the first outlet and the second outlet, described first inlet communication of described first outlet, described second outlet and described second inlet communication; Be provided with flow rate detection module 5 and pressure detection module 7 in described shell, described flow rate detection module 5 comprises differential pressure transmitter, and the positive pressure side and described first of described differential pressure transmitter exports and is connected, and the negative pressure end and described second of described differential pressure transmitter exports and is connected; Described pressure detection module 7 exports with first of described pitot tube 1 and is connected.
Differential pressure transmitter is for measuring the liquid level of liquid, gas and steam, density and pressure, and the current signal being then converted into 4-20mADC exports.
As shown in Figure 1, first import and the second import are all stretched into outside described thief rod 2, when detecting the flow velocity of the flue gas in flue gas emission, thief rod 2 and pitot tube 1 are stretched in chimney, and make the first import be positioned at the below of the second import, flue gas in chimney from bottom to top flows, and a large amount of flue gas enters in pitot tube 1 by the first import, enters in pressure difference transmitter through thief rod 2 from the first outlet; Due to the second import upward, therefore the flue gas of seldom amount is only had to enter in pitot tube 1 by the second import, therefore, pressure reduction is produced between the first outlet and the second outlet, also be positive pressure side and the negative pressure end generation pressure reduction of differential pressure transmitter, differential pressure transmitter by malleation and differential pressure pressure reading, calculate and export set current value, then export flue gas monitoring system to by the current value that the computing of transmitter inside chip calculates flue gas flow rate conversion.
In addition, pressure detection module 7 is also comprised in the velocity pressure integral type measuring instrument of employing pitot tube 1 method provided by the invention, described pressure detection module 7 exports with first of described pitot tube 1 and is connected, therefore, described pressure detection module 7 can measure the flue gas pressures in the first exit, the pressure of the flue gas namely in chimney.
The velocity pressure integral type measuring instrument of employing pitot tube 1 method provided by the invention comprises pitot tube 1, flow rate detection module 5 and pressure detection module 7, flow rate detection module 5 is connected with pitot tube 1 respectively with pressure detection module 7, flow rate detection module 5 measures the flow velocity of flue gas by the pressure reduction at pitot tube 1 two ends, pressure detection module 7 is by the pressure of the pressure survey flue gas in pitot tube 1 first exit, as can be seen here, the present invention adopts pitot tube 1 can measure flow velocity and the pressure of flue gas simultaneously, this integral type measuring instrument integration degree is low, testing process is simple, time saving and energy saving.
Wherein, described pressure detection module 7 comprises and exports with first of described pitot tube 1 pressure transducer be connected.By the flue gas that pitot tube 1 enters, enter pressure transducer from the first outlet and measure.
In addition, pressure detection module 7 can also be that other can measure the structure of flue gas pressures, such as pressure gauge etc.
In order to improve the integration degree of this integral type measuring instrument, to simplify structure, be convenient for measuring, in the present embodiment, the velocity pressure integral type measuring instrument of described employing pitot tube 1 method also comprises tee pipe coupling 9, and described tee pipe coupling 9 comprises first interface, the second interface and the 3rd interface, and described first interface exports with first of described pitot tube 1 and is connected, the positive press bond of described second interface and described differential pressure transmitter, described 3rd interface is connected with described pressure transducer.
The flue gas reaching the first outlet from the first import of pitot tube 1 carries out reflux by tee pipe coupling 9, partial fume enters the positive pressure side of pressure difference transmitter by the second interface, another part enters in pressure transducer by the 3rd interface, to facilitate the flow velocity and pressure that detect flue gas simultaneously.
In the present embodiment, described first outlet is connected with described differential pressure transmitter by differential pressure delivery pipe; Described first outlet is connected with described pressure transducer by penstock.The pressure part in the first exit of pitot tube 1 enters in pressure difference transmitter by pressure reduction delivery pipe, another part enters in pressure transducer by penstock, the present embodiment realizes shunting, to measure flow velocity and pressure simultaneously by differential pressure delivery pipe and these two pipes of penstock.
In the present embodiment, the velocity pressure integral type measuring instrument of described employing pitot tube 1 method also comprises the temperature detecting module 4 for detecting described thief rod 2 temperature, and described temperature detecting module 4 is connected with described thief rod 2.
Due to when measuring flow velocity and the pressure of flue gas, thief rod 2 stretches in flue (such as chimney), in flue, flue gas contacts with thief rod 2, and transfer heat to thief rod 2, therefore, the temperature of thief rod 2 is equal to the temperature of flue gas substantially, and temperature detecting module 4 by measuring the temperature of thief rod 2, can draw the temperature of flue gas by being connected with thief rod 2.
Preferably, thief rod 2 adopts corrosion-resistant stainless steel to make, and to promote heat transfer, and improves corrosion resistance, extends the serviceable life of this integral type measuring instrument.
In the present embodiment, described temperature detecting module 4 comprises temperature sensor, and the probe of temperature sensor is between the outer wall and the inwall of thief rod 2 of pitot tube 1.Flue gas gathers flowing at pitot tube 1, temperature between the outer wall of pitot tube 1 and the inwall of thief rod 2 equals flue-gas temperature, the probe of temperature sensor is arranged between the outer wall of pitot tube 1 and the inwall of thief rod 2, easily can measures the temperature of flue gas exactly.
In the present embodiment, the velocity pressure integral type measuring instrument of described employing pitot tube 1 method also comprises signals collecting and output module, described signals collecting and output module are connected with described pressure detection module 7, described temperature detecting module 4 and described pressure detection module 7 respectively, and described signals collecting and output module are used for being connected with flue gas detecting system.This integral type measuring instrument is by signals collecting and output module and flue gas detecting system communication, can send the information such as the temperature of flue gas, pressure and flow velocity to flue gas monitoring system by signals collecting and output module, temperature, the information such as pressure and flow velocity of the described flue gas that flue gas monitoring system can transmit according to signals collecting and output module judge whether flue gas emission breaks down.
In the present embodiment, be also provided with connection terminal 6 in described shell, described signals collecting is connected with described connection terminal 6 respectively with output module, described pressure detection module 7, described temperature detecting module 4 and described pressure detection module 7.Connection terminal 6 is convenient to be connected, and convenient being concentrated by electric elements of connection terminal 6 couples together, to simplify the structure of this integral type measuring instrument.
In the present embodiment, the first end of described thief rod 2 stretches in chimney to be measured, and second end (right-hand member namely in Fig. 1) of described thief rod 2 is connected with flange, and described flange is used for being connected with chimney to be measured.
Chimney outer wall is provided with support, support comprises flange bracket, after the flange of second end (right-hand member namely in Fig. 1) of thief rod 2 and flange bracket are connected by securing members such as bolts, just the effect be connected with flue by this integral type measuring instrument is achieved, the present invention only needs the one-sided chimney side at fume emission, flange fixed form is efficient and convenient, saves the set-up time.
In the present embodiment, the lower casing 3 that described shell comprises upper casing 8 and is connected with described upper casing 8, described lower casing 3 is connected with described thief rod 2.Temperature detecting module 4, flow rate detection module 5 and pressure detection module 7 are arranged on lower casing 3 inwall, and are sealed by upper casing 8.Whole integral type measuring instrument profile is simple, and inner structure is compact, overall small and exquisite, is convenient for carrying.
The shape of shell can be the rectangle shown in Fig. 1, also can be other various shapes.
As shown in Figure 1, the outline of lower casing 3 is L-type, and the outline of upper casing 8 is U-shaped.
Shell is also provided with integral type power supply communication cable outward, just can realize communication by signals collecting and output module.
The invention provides integral measuring fluid temperature (F.T.), pressure, flow velocity in the measuring instrument of one, the present invention is mainly used in the on-line measurement of each Monitoring factors of flowing gas, is widely used in the temperature of the middle flue gas of flue gas emission, pressure, the isoparametric measurement of flow velocity.The present invention is when measuring, and flue gas flows through pitot tube 1, just can the detecting factor such as temperature, pressure flow velocity of disposable measurement flue gas by commutation shunting, and integration degree is high, measures convenient and swift.
The velocity pressure integral type measuring instrument of employing skin push-in construction provided by the invention can to the temperature of flue gas, pressure, the Monitoring factors such as flow velocity are measured, and can on-line normalization be realized, install simple, only need the one-sided chimney being independently arranged on flue gas emission, just can measure, greatly save the set-up time, its high sealing performance ensures its test constantly in the presence of a harsh environment, decay resistance makes the stable operation under long-term rugged surroundings, saving maintenance cost makes whole measuring system carry out in order, there is the life-span compared with similar-type products high, accuracy is high, the advantage such as easy to maintenance.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. adopt a velocity pressure integral type measuring instrument for pitot tube method, it is characterized in that, comprise pitot tube, the thief rod be sheathed on described pitot tube, and the shell be connected with described thief rod;
The input end of described pitot tube is provided with the first import down and the second import upward; The output terminal of described pitot tube is provided with the first outlet and the second outlet, described first outlet and described first inlet communication, described second outlet and described second inlet communication;
Be provided with flow rate detection module and pressure detection module in described shell, described flow rate detection module comprises differential pressure transmitter, and the positive pressure side and described first of described differential pressure transmitter exports and is connected, and the negative pressure end and described second of described differential pressure transmitter exports and is connected;
Described pressure detection module exports with first of described pitot tube and is connected.
2. the velocity pressure integral type measuring instrument of employing pitot tube method according to claim 1, is characterized in that, described pressure detection module comprises and exports with first of described pitot tube the pressure transducer be connected.
3. the velocity pressure integral type measuring instrument of employing pitot tube method according to claim 2, it is characterized in that, also comprise tee pipe coupling, described tee pipe coupling comprises first interface, the second interface and the 3rd interface, described first interface exports with first of described pitot tube and is connected, the positive press bond of described second interface and described differential pressure transmitter, described 3rd interface is connected with described pressure transducer.
4. the velocity pressure integral type measuring instrument of employing pitot tube method according to claim 2, is characterized in that, described first outlet is connected with described differential pressure transmitter by differential pressure delivery pipe; Described first outlet is connected with described pressure transducer by penstock.
5. the velocity pressure integral type measuring instrument of the employing pitot tube method according to any one of claim 1-4, is characterized in that, also comprise the temperature detecting module for detecting described thief rod temperature, described temperature detecting module is connected with described thief rod.
6. the velocity pressure integral type measuring instrument of employing pitot tube method according to claim 5, it is characterized in that, described temperature detecting module comprises temperature sensor, and the probe of temperature sensor is between the outer wall and the inwall of thief rod of pitot tube.
7. the velocity pressure integral type measuring instrument of employing pitot tube method according to claim 5, it is characterized in that, also comprise signals collecting and output module, described signals collecting and output module respectively with described pressure detection module, described temperature detecting module and described pressure detection model calling, described signals collecting and output module are used for being connected with flue gas detecting system.
8. the velocity pressure integral type measuring instrument of employing pitot tube method according to claim 7, it is characterized in that, also be provided with connection terminal in described shell, described signals collecting is connected with described connection terminal respectively with output module, described pressure detection module, described temperature detecting module and described pressure detection module.
9. the velocity pressure integral type measuring instrument of employing pitot tube method according to claim 1, it is characterized in that, the first end of described thief rod stretches in chimney to be measured, and the second end of described thief rod is connected with flange, and described flange is used for being connected with chimney to be measured.
10. the velocity pressure integral type measuring instrument of employing pitot tube method according to claim 1, is characterized in that, the lower casing that described shell comprises upper casing and is connected with described upper casing, and described lower casing is connected with described thief rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510817759.3A CN105486359A (en) | 2015-11-20 | 2015-11-20 | Flow velocity and pressure integral measuring instrument using Pitot tube method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510817759.3A CN105486359A (en) | 2015-11-20 | 2015-11-20 | Flow velocity and pressure integral measuring instrument using Pitot tube method |
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| CN105486359A true CN105486359A (en) | 2016-04-13 |
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| CN201510817759.3A Pending CN105486359A (en) | 2015-11-20 | 2015-11-20 | Flow velocity and pressure integral measuring instrument using Pitot tube method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105973322A (en) * | 2016-07-26 | 2016-09-28 | 合肥科迈捷智能传感技术有限公司 | Temperature and pressure integrated pitot tube flowmeter |
| CN110702943A (en) * | 2019-12-01 | 2020-01-17 | 范其元 | Flow rate measuring device with improved pitot tube connection structure |
| CN110763868A (en) * | 2019-10-31 | 2020-02-07 | 广东伟创科技开发有限公司 | Flow velocity and pressure integrated measuring instrument for online monitoring of flue gas by using pitot tube method |
| WO2020248231A1 (en) * | 2019-06-14 | 2020-12-17 | Rosemount Inc. | Averaging pitot tube having adjustable resonant frequency |
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| EP0178776A1 (en) * | 1984-10-17 | 1986-04-23 | Dieterich Standard Corp. | Improvements in pitot tube type flow measuring devices and methods of mounting same in liquid/gas two-phase or multi-phase systems |
| CN201289493Y (en) * | 2008-08-07 | 2009-08-12 | 深圳市彩虹谷科技有限公司 | Apparatus for measuring flue gas velocity pressure temperature |
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| EP0178776A1 (en) * | 1984-10-17 | 1986-04-23 | Dieterich Standard Corp. | Improvements in pitot tube type flow measuring devices and methods of mounting same in liquid/gas two-phase or multi-phase systems |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105973322A (en) * | 2016-07-26 | 2016-09-28 | 合肥科迈捷智能传感技术有限公司 | Temperature and pressure integrated pitot tube flowmeter |
| WO2020248231A1 (en) * | 2019-06-14 | 2020-12-17 | Rosemount Inc. | Averaging pitot tube having adjustable resonant frequency |
| US11067417B2 (en) | 2019-06-14 | 2021-07-20 | Rosemount Inc. | Averaging pitot tube having an adjustable resonant frequency |
| CN110763868A (en) * | 2019-10-31 | 2020-02-07 | 广东伟创科技开发有限公司 | Flow velocity and pressure integrated measuring instrument for online monitoring of flue gas by using pitot tube method |
| CN110702943A (en) * | 2019-12-01 | 2020-01-17 | 范其元 | Flow rate measuring device with improved pitot tube connection structure |
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Application publication date: 20160413 |