CN106525159A - Air flow measurement device - Google Patents

Air flow measurement device Download PDF

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Publication number
CN106525159A
CN106525159A CN201610991444.5A CN201610991444A CN106525159A CN 106525159 A CN106525159 A CN 106525159A CN 201610991444 A CN201610991444 A CN 201610991444A CN 106525159 A CN106525159 A CN 106525159A
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CN
China
Prior art keywords
orifice plate
flow measurement
hole
air channel
satellite
Prior art date
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.)
Pending
Application number
CN201610991444.5A
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Chinese (zh)
Inventor
杨丰云
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Taiyuan Puri Meter Co Ltd
Original Assignee
Taiyuan Puri Meter Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Taiyuan Puri Meter Co Ltd filed Critical Taiyuan Puri Meter Co Ltd
Priority to CN201610991444.5A priority Critical patent/CN106525159A/en
Publication of CN106525159A publication Critical patent/CN106525159A/en
Pending legal-status Critical Current

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
    • G01F1/05Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow by using mechanical effects
    • G01F1/34Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/36Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the 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
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
    • G01F1/05Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow by using mechanical effects
    • G01F1/34Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/36Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the 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
    • G01F1/40Details or construction of the flow constriction devices
    • G01F1/42Orifices or nozzles

Abstract

The invention relates to an air flow measurement device. The air flow measurement device comprises a tube wall and an orifice plate, wherein the orifice plate is arranged on the tube wall in a fixing mode, the orifice plate is perpendicular to the axis direction of the tube wall, and the center of the orifice plate is perpendicular to the axis of the tube wall and is provided a circular-type main orifice, a plurality of satellite orifices are formed and uniformly distributed on the outer edges of the main orifice. The air flow measurement device makes an air fluid formed an ideal fluid in the measurement, and improves the measurement accuracy.

Description

Air channel flow measurement device
Technical field
The invention belongs to the fluid measurement technical field in air channel, more particularly to a kind of air channel flow measurement device.
Background technology
Exerting oneself for station boiler double-inlet and double-outlet steel ball coal mill is controlling through control into the primary air flow in coal pulverizer System enters the fuel quantity of boiler, thus it is more strict to the accuracy and required precision of primary air measuring signal, and big mouth The accurate measurement of footpath air channel flow is one of still unsolved difficult problem of domestic station boiler.
As domestic Power Boilers Design floor space is critically important index, during nearly all station boiler Duct design all Requirement of the air measuring to straight length is not taken into full account.As pipeline section is big, straight length is short, flow velocity is low, cause containing dust greatly There are many difficult problems in measurement.The station boiler larger for coal-fired ash content, with increasing for run time, it may appear that one Secondary wind dust-carrying capacity increase, more exacerbates the stifled ash problem of measuring system sampled part.Most station boiler primary air flows cannot be measured Accurately, pulverizer' s primary air flow measurement is inaccurate, and generator volume curve is poor with the corresponding relation of valve opening and unit load.Primary air flow Used as the critically important regulated variable of combustion control system, air measuring is inaccurate, precision is inadequate, it is meant that the coal dust of boiler is removed in feeding Amount is difficult to precise control.So that the whole combustion system parameter of boiler all fluctuates outside expected control range.Solve coal pulverizer Primary air measuring problem annoyings person skilled always.
Traditional airfoil measuring equipment is widely used nearly 40 years in most power plant, mainly based on three curve wings. Its shortcoming is fairly obvious, and crushing is larger, and crushing is in 60%~100% differential pressure value;Manufacturing process is relatively difficult, and easily blocking letter Number pipeline;Repeated stability is poor;Wind speed is low, and pressure measurement effect at several kPas is very poor.Its advantage relatively conventional old three Sample (orifice plate, nozzle, venturi) range ratio can accomplish 10 1,1D after 3D before straight length (D represent be bore).Numerous producers Promise can accomplish 0.2D after front 0.6D, but it is actually used during many investigation discoveries of Jing be simply possible to use in monitoring purposes, it is impossible to Satisfaction automatically controls use.
The content of the invention
The present invention provides air channel flow measurement device to overcome technical problem present in prior art, the air channel flow Measurement apparatus can cause fluid to form perfect fluid in measurement, improve the precision of measurement.
A kind of air channel flow measurement device, including tube wall, fixedly mount the axis side of abacus, orifice plate and tube wall on tube wall To vertical, the center of orifice plate is vertical with the axis of tube wall, and the center of orifice plate is provided with main aperture, and main aperture is circle.
It is that porous rectifier and measuring diaphragm unite two into one that rectification porous flowmeter is cleverly designed, can be to greatest extent Ground by flow field balanced adjustment into perfect condition, so as to the advantage of differential pressure flowmeter is performed to best.When fluid through apertures plate Main aperture when, fluid will be balanced adjustment, and vortex is minimized, formed approximate ideal fluid, by conventional pressure obtaning device, can obtain Differential pressure signal that must be stable, calculates volume flow, mass flow according to Bernoulli equation.
Preferred technical scheme, its supplementary features is:The hole wall of main aperture is vertical with orifice plate.
It is vertically arranged with orifice plate by hole wall, not easy to wear, its β value keeps constant for a long time, greatly prolongs the re-testing periods, is saved Save calibrating expense.And, the shearing force of turbulent flow is decreased on tonometric impact.
Preferred technical scheme, its supplementary features is:Satellite hole is additionally provided with the outside of main aperture, satellite hole is outside main aperture Side is uniformly distributed.
By arranging satellite hole, the circulation area of fluid can be increased, improve negotiability, measurement apparatus are reduced to pressure Caused loss.The permanent pressure loss of the orifice plate of porous can be reduced to the 1/2 of the orifice plate of single hole, significantly save Energy resource consumption.
Further preferred technical scheme, its supplementary features is:Satellite hole is divided into multigroup, and every group of satellite hole is along orifice plate Center be uniformly distributed.
The symmetrical balanced design of porous, reduces the formation and turbulent skin friction of vortex, reduces kinetic energy rejection, same 2.5 times of permanent compression loss under Test Cycle, is reduced compared with conventional throttle device, Venturi tube is close to, so as to save Sizable operation cost of energy, is a kind of typical energy-saving instrument, is worth large-scale popularization.
Technical scheme still further preferably, its supplementary features is:The hole wall in satellite hole is perpendicular to orifice plate.
It is vertically arranged with orifice plate by hole wall, not easy to wear, its β value keeps constant for a long time, greatly prolongs the re-testing periods, is saved Save calibrating expense.And, the shearing force of turbulent flow is decreased on tonometric impact.
Technical scheme still more preferably, its supplementary features is:Orifice plate main aperture and two adjacent satellite holes it Between region be provided with kuppe, kuppe is hemispherical or elliposoidal.
By arranging kuppe, the fluid of orifice plate can be directed through, it is to avoid the pressure loss for forming vortex and causing, from And saved energy resource consumption.
Technical scheme still further preferably, its supplementary features is:Adjacent 3 of the orifice plate between two groups of satellite holes or Region between 4 satellite holes is provided with kuppe, and kuppe is hemispherical or elliposoidal.
By arranging kuppe, the fluid of orifice plate can be directed through, it is to avoid the pressure loss for forming vortex and causing, from And saved energy resource consumption.
Technical scheme still further preferably, its supplementary features is:Hole area based on the area summation in each satellite hole 3/7-2/3.
When the area summation by each satellite hole is set to above-mentioned area, flow measurement dress can be effectively improved The handling capacity put, reduces absolute pressure loss.The pressure change for producing simultaneously, it is sufficient to measured using common pressure sensor Out accurate result.
Preferred technical scheme, its supplementary features is:Orifice plate is respectively provided on two sides with pressure sensor.
By arranging pressure sensor, stable differential pressure signal can be obtained, according to primary with the pressure drop of measuring diaphragm both sides Exert sharp equation and calculate volume flow, mass flow.
Additionally, having further the advantage that:
Rectification porous flowmeter is suitable for almost all fluid measurements, is a revolution of fluid measurement technology, its processing, Manufacture installation can realize standardization as orifice plate, and calibrating is same easily to realize dry mark, is expected to become the new state of throttling arrangement Border standard.
Unified high-precision flow measurement, will improve material and Energy Sources Equilibrium ratio.Porous flow measurement device is through real stream Demarcate, sensor accuracy reachable ± 0.30%, ± 0.50%, it is adaptable to Trade Measures occasion;Examined and determine with physical dimension, sensor Precision reachable ± 0.50%, ± 1.00%, it is adaptable to process control contexts.
Straight length requirement is minimum, can save substantial amounts of pipeline material and correlative charges.Porous flow measurement device can be by Flow field balanced adjustment is stable, and the requirement of the fast twice of pressure recovery ratio conventional throttle device, significantly shortage to straight length.Mostly In the case of number, before and after which, straight length is 1D, minimum 0.5D after front 2D.
Range ratio width, repeatability and long-time stability are good.Compared with conventional throttle device, rectification porous flowmeter is greatly carried High measurement range.Result of study shows:When Reynolds number is more than 50000, suitable aperture parameters, porous flow measurement dress are selected Put range ratio unrestricted.According to commercial measurement practical application needs, general measure range ratio is 10:1,10:More than 1 can use Multiple transmitter areal surveys, can make range ratio reach 30:1、50:1 or higher, β value selects also to breach traditional orifice plate (β value For the ratio of the opening diameter and internal diameter of the pipeline of orifice plate), from 0.20~0.95, repeatability is greatly improved, up to 0.1%.
Long service life.Whole instrument is without movable member, therefore can be saved than tradition with stable for extended periods of time, service life 5~10 times of device for prolonging of stream.
Description of the drawings
Fig. 1 is the front view of the air channel flow measurement device of the embodiment of the present invention 1;
Fig. 2 is the left view of Fig. 1.
Fig. 3 is the left view of the air channel flow measurement device of the embodiment of the present invention 2.
Fig. 4 is the sectional view of the air channel flow measurement device of the embodiment of the present invention 3;
Fig. 5 is the left view of Fig. 4.
Fig. 6 is the front view of the air channel flow measurement device of the embodiment of the present invention 2.
Specific embodiment
For the content of the invention, feature and effect of the present invention can be further appreciated that, following examples are hereby enumerated, and is described in detail It is as follows:
Embodiment 1:
Fig. 1 is the front view of the air channel flow measurement device of the embodiment of the present invention 1;Fig. 2 is the left view of Fig. 1.
Implication in figure represented by emerging reference is as follows:1st, mounting flange;2nd, tube wall;3rd, orifice plate;4 main apertures.
A kind of air channel flow measurement device, including tube wall, the two ends of tube wall are fixedly connected with mounting flange respectively, Method for Installation Orchid is engaged for the flange with pipeline, and measurement apparatus are installed in pipeline, and abacus, orifice plate and pipe are fixedly mounted on tube wall The axis direction of wall is vertical, and the center of orifice plate is vertical with the axis of tube wall, and the center of orifice plate is provided with main aperture, and main aperture is circle.
It is that porous rectifier and measuring diaphragm unite two into one that rectification porous flowmeter is cleverly designed, can be to greatest extent Ground by flow field balanced adjustment into perfect condition, so as to the advantage of differential pressure flowmeter is performed to best.When fluid through apertures plate Main aperture when, fluid will be balanced adjustment, and vortex is minimized, formed approximate ideal fluid, by conventional pressure obtaning device, can obtain Differential pressure signal that must be stable, calculates volume flow, mass flow according to Bernoulli equation.
Preferably, the hole wall of main aperture is vertical with orifice plate.
It is vertically arranged with orifice plate by hole wall, not easy to wear, its β value keeps constant for a long time, greatly prolongs the re-testing periods, is saved Save calibrating expense.And, the shearing force of turbulent flow is decreased on tonometric impact.
Preferably, orifice plate is respectively provided on two sides with pressure sensor.
By arranging pressure sensor, stable differential pressure signal can be obtained, according to primary with the pressure drop of measuring diaphragm both sides Exert sharp equation and calculate volume flow, mass flow.
Embodiment 2:
Fig. 3 is the left view of the air channel flow measurement device of the embodiment of the present invention 2.In figure, used with above-described embodiment Accompanying drawing identical reference, still continues to use above-described embodiment for the definition of the reference.Emerging accompanying drawing mark in figure The represented implication of note is as follows:5th, satellite hole.
The present embodiment with the difference of embodiment 1 is:
Satellite hole is additionally provided with the outside of main aperture, satellite hole is uniformly distributed on the outside of main aperture.
By arranging satellite hole, the circulation area of fluid can be increased, improve negotiability, measurement apparatus are reduced to pressure Caused loss.The permanent pressure loss of the orifice plate of porous can be reduced to the 1/2 of the orifice plate of single hole, significantly save Energy resource consumption.
Still further preferably, the hole wall in satellite hole is perpendicular to orifice plate.
It is vertically arranged with orifice plate by hole wall, not easy to wear, its β value keeps constant for a long time, greatly prolongs the re-testing periods, is saved Save calibrating expense.And, the shearing force of turbulent flow is decreased on tonometric impact.
Still further preferably, based on the area summation in each satellite hole hole area 3/7-2/3.
When the area summation by each satellite hole is set to above-mentioned area, flow measurement dress can be effectively improved The handling capacity put, reduces absolute pressure loss.The pressure change for producing simultaneously, it is sufficient to measured using common pressure sensor Out accurate result.
Additionally, having further the advantage that:
Rectification porous flowmeter is suitable for almost all fluid measurements, is a revolution of fluid measurement technology, its processing, Manufacture installation can realize standardization as orifice plate, and calibrating is same easily to realize dry mark, is expected to become the new state of throttling arrangement Border standard.
Unified high-precision flow measurement, will improve material and Energy Sources Equilibrium ratio.Porous flow measurement device is through real stream Demarcate, sensor accuracy reachable ± 0.30%, ± 0.50%, it is adaptable to Trade Measures occasion;Examined and determine with physical dimension, sensor Precision reachable ± 0.50%, ± 1.00%, it is adaptable to process control contexts.
Straight length requirement is minimum, can save substantial amounts of pipeline material and correlative charges.Porous flow measurement device can be by Flow field balanced adjustment is stable, and the requirement of the fast twice of pressure recovery ratio conventional throttle device, significantly shortage to straight length.Mostly In the case of number, before and after which, straight length is 1D, minimum 0.5D after front 2D.
Range ratio width, repeatability and long-time stability are good.Compared with conventional throttle device, rectification porous flowmeter is greatly carried High measurement range.Result of study shows:When Reynolds number is more than 50000, suitable aperture parameters, porous flow measurement dress are selected Put range ratio unrestricted.According to commercial measurement practical application needs, general measure range ratio is 10:1,10:More than 1 can use Multiple transmitter areal surveys, can make range ratio reach 30:1、50:1 or higher, β value selects also to breach traditional orifice plate, from 0.20~0.95, repeatability is greatly improved, up to 0.1%.
Long service life.Whole instrument is without movable member, therefore can be saved than tradition with stable for extended periods of time, service life 5~10 times of device for prolonging of stream.
Embodiment 3:
Fig. 4 is the sectional view of the air channel flow measurement device of the embodiment of the present invention 3;Fig. 5 is the left view of Fig. 4.In figure, with The used accompanying drawing identical reference of above-described embodiment, still continues to use above-described embodiment for the definition of the reference.Figure In implication represented by emerging reference it is as follows:6th, radome fairing.
The present embodiment with the difference of embodiment 2 is:
Region of the orifice plate between main aperture and two adjacent satellite holes is provided with kuppe, and kuppe is hemispherical.
When left side of the air-flow from diagram is entered in measurement apparatus, hemispheric kuppe is run into, can first by water conservancy diversion Cover water conservancy diversion, smoothly stream enter satellite hole 5 and main aperture 4, it is to avoid be directly impinging on orifice plate and pass through satellite hole 5 and main aperture 4 and shape Into vortex and turbulent flow, reduce turbulent flow, vortex and the pressure loss that causes, so as to save energy resource consumption.
Embodiment 4:
Fig. 6 is the left view of the air channel flow measurement device of the embodiment of the present invention 2.
The present embodiment with the difference of embodiment 2 is:
Satellite hole is divided into two groups, and every group of satellite hole is uniformly distributed along the center of orifice plate, and every group of satellite hole is distributed in one The individual circle with aperture plate center as the center of circle.
The symmetrical balanced design of porous, reduces the formation and turbulent skin friction of vortex, reduces kinetic energy rejection, same 2.5 times of permanent compression loss under Test Cycle, is reduced compared with conventional throttle device, Venturi tube is close to, so as to save Sizable operation cost of energy, is a kind of typical energy-saving instrument, is worth large-scale popularization.
Although being described to the preferred embodiments of the present invention above in conjunction with accompanying drawing, the invention is not limited in The specific embodiment stated, above-mentioned specific embodiment are only schematic, be not it is restricted, this area it is common Technical staff in the case of without departing from present inventive concept and scope of the claimed protection, may be used also under the enlightenment of the present invention To make many forms, for example:1. radome fairing, it is also possible to apply in the case where there is multigroup satellite hole;2. orifice plate, not only may be used Being circular, or rectangle;3. radome fairing can be not only hemispherical, it is also possible to semielliptical shape.These belong to Within protection scope of the present invention.

Claims (9)

1. a kind of air channel flow measurement device, it is characterised in that:Including tube wall, abacus on the tube wall, is fixedly mounted, it is described Orifice plate is vertical with the axis direction of the tube wall, and the center of the orifice plate is vertical with the axis of the tube wall, in the orifice plate Main aperture is provided with the heart, the main aperture is circle.
2. air channel flow measurement device according to claim 1, it is characterised in that:The hole wall of the main aperture and the orifice plate Vertically.
3. air channel flow measurement device according to claim 1, it is characterised in that:It is additionally provided with the outside of the main aperture and defends Star hole, the satellite hole are uniformly distributed on the outside of main aperture.
4. air channel flow measurement device according to claim 3, it is characterised in that:The satellite hole be divided into it is multigroup, per group Center of the satellite hole along the orifice plate is uniformly distributed.
5. the air channel flow measurement device according to any one of claim 4 or 3, it is characterised in that:The satellite hole Hole wall is perpendicular to the orifice plate.
6. the air channel flow measurement device according to claim asks 3, it is characterised in that:The orifice plate is in the main aperture and phase Region between two adjacent satellite holes is provided with kuppe, and the kuppe is hemispherical or elliposoidal.
7. air channel flow measurement device according to claim 4, it is characterised in that:
Region of the orifice plate between the adjacent 3 or 4 satellite hole described in two groups between satellite hole is provided with kuppe, The kuppe is hemispherical or elliposoidal.
8. the air channel flow measurement device according to any one of claim 4 or 3, it is characterised in that:Each described satellite The area summation in hole is the 3/7-2/3 of the main aperture area.
9. air channel flow measurement device according to claim 1, it is characterised in that:The pressure that is respectively provided on two sides with of orifice plate is passed Sensor.
CN201610991444.5A 2016-11-10 2016-11-10 Air flow measurement device Pending CN106525159A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610991444.5A CN106525159A (en) 2016-11-10 2016-11-10 Air flow measurement device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610991444.5A CN106525159A (en) 2016-11-10 2016-11-10 Air flow measurement device

Publications (1)

Publication Number Publication Date
CN106525159A true CN106525159A (en) 2017-03-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109579925A (en) * 2018-11-17 2019-04-05 德闻仪器仪表(上海)有限公司 A kind of built-in multichannel ultrasonic flow metering module
CN110487346A (en) * 2019-08-12 2019-11-22 西安航天动力试验技术研究所 A kind of big flow cryogenic propellant supply line rectification orifice plate and its design method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109579925A (en) * 2018-11-17 2019-04-05 德闻仪器仪表(上海)有限公司 A kind of built-in multichannel ultrasonic flow metering module
CN110487346A (en) * 2019-08-12 2019-11-22 西安航天动力试验技术研究所 A kind of big flow cryogenic propellant supply line rectification orifice plate and its design method

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