CN208333564U - A kind of axial flow blower flow measurement device based on cross probe - Google Patents
A kind of axial flow blower flow measurement device based on cross probe Download PDFInfo
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- CN208333564U CN208333564U CN201820888825.5U CN201820888825U CN208333564U CN 208333564 U CN208333564 U CN 208333564U CN 201820888825 U CN201820888825 U CN 201820888825U CN 208333564 U CN208333564 U CN 208333564U
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Abstract
The utility model provides a kind of axial flow blower flow measurement device based on cross probe, the measuring device includes total pressure measurement cross, static pressure measurement ring, Data Post and integrated circuit, total pressure measurement cross is connected and composed by four total pressure probes with cross connecting piece, measuring point there are six opening on every probe branch bar, point position is according to the around-France selection of homalographic.Four hydrostatic measuring points are chosen in a certain sectional uniform of blower barrel.It chooses average total pressure and average static pressure and then finds out axial flow blower flow, and realized and monitored on-line by hardware device.The utility model realizes the flow measurement of heavy caliber axial flow blower, the method for improving the accuracy of total pressure measurement, and simplifying static pressure measurement by distinctive design structure.It has the advantages of simple structure and easy realization, is conducive to Industry Control Application.
Description
Technical field
The utility model belongs to measuring instrument technical field, and in particular to a kind of axial flow blower flow based on cross probe
Measuring device.
Background technique
There is a large amount of vaneaxial blower in thermal power plant, such as to the pressure fan of boiler conveying air, exclusion boiler smoke
Air-introduced machine, pulverized coal conveying primary air fan and secondary air fan, to desulphurization system provide the booster fan of power, air-cooled thermal power plant
The middle air cooling blower fan as condenser cooling air driving equipment.Fans entrance flow is accurately measured to Power Plant Thermal process
Control has great importance, and fans entrance flow is the control variable or intermediate computations variable of many control systems, such as burner hearth
Negative pressure system, combustion control system, therefore safety and economy close phase of the measurement with thermal power plant of axial flow blower flow
It closes.
However these blowers have bore is big, flow velocity is low, flow is big, the non-uniform common feature in flow field, by more axis streams
The air-cooled array of blower composition need to measure multiple points in same section there is also influencing each other.And it is most of
Blower is all outdoor arrangement, and entrance aerodynamic field is easy to be influenced by natural wind disturbance.
The installation site of the above fans entrance kinetic character, the heavy caliber of blower sizes, blower, so that heavy caliber axis stream
The inlet flow rate measurement of blower becomes one of the problem for perplexing power plant's actual motion for a long time.For this status, power plant
Existing compressor flow measurement method is to survey the stagnation pressure and static pressure of equally distributed measuring point simultaneously by Pitot tube array, pass through meter
Calculation acquires flow.But existing method, it is constantly present the problems such as axial flow blower bore is big, flow field is uneven, vulnerable to interfering.
Utility model content
To solve the above-mentioned problems, the utility model provides a kind of axial flow blower flow measurement dress based on cross probe
It sets, the measuring device includes total pressure measurement cross, static pressure measurement ring and data processing, the total pressure measurement cross and quiet
Pressure measurement ring connects data processing, and the total pressure measurement cross is equipped with multiple stagnation pressure measuring points, and the static pressure measurement ring is equipped with
Multiple static pressure measurement points；
Further, the total pressure measurement cross is connected and composed by four total pressure probes with cross connecting piece, and every total
It is opened on pressure probe branch bar there are six measuring point, point position selects method around-France for homalographic；
Further, the total pressure probe branch bar is the hollow Pitot tube to install measurement stagnation pressure；
Further, the measuring device further includes air duct, the blower barrel of the air duct total pressure measurement cross with
On section between air outlet, a static bole is opened up every 90 °, four static boles form static pressure measurement ring；
Further, four circular holes are additionally provided on the blower barrel of the air duct, one end of four total pressure probes is solid
It is scheduled in four circular holes；
Further, the data processing includes differential pressure module, data acquisition module, microprocessor, display module sum number
Word output module；
Differential pressure module one end connection total pressure measurement cross and static pressure measurement ring, the other end pass through sensor connection number
According to acquisition module, the data acquisition module connects microprocessor；
Further, the microprocessor connects display module by digital output module；
The beneficial effects of the utility model are as follows:
1): the flow measurement of heavy caliber axial flow blower is realized by distinctive design structure；
2): having the advantages of simple structure and easy realization, measurement result is relatively accurate, is conducive to Industry Control Application.
Detailed description of the invention
Fig. 1 is measuring device structure chart described in the utility model；
Fig. 2 is total pressure measurement sectional view in measuring device described in the utility model；
Fig. 3 is static pressure measurement sectional view in measuring device described in the utility model；
Fig. 4 is data processing method schematic diagram when measuring device described in the utility model uses；
Wherein, 1, air duct, 2, impeller, 3, blade, 4, motor, 5, total pressure measurement section, 6, static pressure measurement section, 7, stagnation pressure
Cross, 8, cross connecting piece, 9, measuring point, 10, static bole, 11, probe strut, 12, Pitot tube, 13, hardware block diagram, 14
Differential pressure module, 15, data acquisition module, 16, microprocessor, 17, power module, 18, display module, 19, digital output module.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, is explained in further detail the utility model.It should be appreciated that specific embodiment described herein is used only for explaining
The utility model is not used to limit the utility model.On the contrary, the utility model cover it is any be defined by the claims this
Substitution, modification, equivalent method and the scheme made in the spirit and scope of utility model.Further, in order to make the public to this reality
Have a better understanding with novel, it is detailed to describe some specific detail portions below in the datail description of the utility model
Point.The utility model can also be understood completely in the description of part without these details for a person skilled in the art.
The utility model is described in further detail in the following with reference to the drawings and specific embodiments, but not as to the utility model
Restriction.Most preferred embodiment is enumerated below for the utility model:
As Figure 1-Figure 4, the utility model provides a kind of axial flow blower flow measurement device based on cross probe, institute
Stating device includes total pressure measurement cross, static pressure measurement ring, Data Post and integrated circuit, and total pressure measurement cross is by 4
Total pressure probe is connected and composed with cross connecting piece, is provided with 6 measuring points on every probe branch bar, point position is according to iso-area circlet
Method, selection use the around-France arrangement flow velocity measuring point reason of homalographic for following two points:
1: heavy caliber axial flow blower air duct inner fluid speed is unevenly distributed, and measures mean flow rate in air duct, and measuring point is closeer
Collection, measurement accuracy are higher.But consider cost problem, it is logical only with several representational measuring points in allowable range of error
It crosses processing and obtains mean flow rate.Using the around-France arrangement measuring point of homalographic, all annulus area equations reduce the work of data processing
It measures.
2: being learnt by CFD emulation, heavy caliber axial flow blower air duct inner fluid speed distribution characteristics is close to the area of barrel
Domain flow regime is complicated, and flow velocity is larger with change in location；Region flow regime close to air duct center is stablized, and flow velocity becomes with position
Change smaller.In order to more accurately measure mean flow rate, measuring point is arranged the biggish position of change in flow more, and press homalographic annulus
The measuring point of method arrangement meets that edge is intensive, the sparse demand in center.4 static pressure are chosen in a certain sectional uniform of blower barrel to survey
Point.It chooses average total pressure and average static pressure and then finds out axial flow blower flow, and realized and monitored on-line by hardware device.Such as figure
Shown in 1, axial flow blower includes air duct 1, impeller 2, blade 3 and motor 4, and static pressure measurement section 5 and total is respectively set before impeller 2
Pressure measurement section 6.
As shown in Fig. 2, opening a circular hole every 90 °, Circularhole diameter is than visiting on the total pressure measurement section 5 of blower barrel 1
Needle branch 11 diameters of bar are somewhat larger, and 4 total layer bars 11 with cross connecting piece 8 connect and compose stagnation pressure ten after protruding into respectively from circular hole
Cabinet frame 7, lead is drawn from circular hole.6 apertures, i.e. measuring point 9 are provided on every probe branch bar.9 position of measuring point is according to homalographic
Around-France selection, the distance R of each measuring point 9 to the center of circleiCalculation formula are as follows:
Wherein i is the number that therefrom mental arithmetic plays iso-area circlet, and n is annulus number (n is 6 herein), and D is air duct diameter.In bar
To be hollow, to install the Pitot tube 12 of measurement stagnation pressure, each measuring point 9 measures a stagnation pressure data.
Equal-area method arranges that principle is as follows:
Wherein Q is axial flow blower flow, vjFor each point velocity, AjPartially to measure section face
Product, and have
When arrangement measuring point around-France using homalographic, Aj=An, so that
Wherein v is mean flow rate, and A is air duct area of section.
As shown in figure 3, opening a static bole 10 every 90 ° on the static pressure measurement section 6 of blower barrel 1, passing through
Static probe measures a static pressure data in each static bole.
As shown in figure 4, the stagnation pressure of extraction and static pressure are accessed differential pressure module 14, measured pressure is converted to table by sensor
Show the standard signal of local atmospheric pressure Yu measured pressure difference.Again by standard signal input data acquisition module 15, by standard
Signal is converted into digital signal, input microprocessor 16.Preliminary signals processing is carried out in microprocessor 16, is such as filtered, removal
Because of small wind disturbance bring noise.And then taking the average value of all stagnation pressure measuring point data measureds is average total pressure, all static pressure are surveyed
The average value of point data measured is average static pressure, it may be assumed that
Wherein P is average total pressure, PiFor each measuring point stagnation pressure, P0For average static pressure, P0,jFor each measuring point static pressure.
The local velocity v of axial flow blower is determined by differential pressure according to Bernoulli equationiAnd mean flow rate v:
Wherein ρ is atmospheric density, and atmospheric density calculation formula is as follows:
Wherein Ph is atmospheric pressure at measuring point,For relative air humidity, t is air themperature, saturated water when Ps is temperature t
The partial pressure of steam.Ph,T, the parameters such as Ps are obtained by live existing device.
Outflow is calculated by the product of mean flow rate and area again:
Q=v × A
Wherein Q is axial flow blower flow, and A is measured place area of section.
Measurement result is finally exported by display module 18 and digital output module 19.
Embodiment described above, only one kind of the utility model more preferably specific embodiment, the skill of this field
The usual variations and alternatives that art personnel carry out within the scope of technical solutions of the utility model should all be included in the guarantor of the utility model
It protects in range.
Claims (7)
1. a kind of axial flow blower flow measurement device based on cross probe, which is characterized in that the measuring device includes stagnation pressure
Measurement cross, static pressure measurement ring and data processing, the total pressure measurement cross connect data processing with static pressure measurement ring, institute
Total pressure measurement cross is stated equipped with multiple stagnation pressure measuring points, the static pressure measurement ring is equipped with multiple static pressure measurement points.
2. measuring device according to claim 1, which is characterized in that the total pressure measurement cross is by four total pressure probes
It is connected and composed, is opened on every total pressure probe branch bar there are six measuring point, point position selects method for iso-area circlet with cross connecting piece
Method.
3. measuring device according to claim 2, which is characterized in that the total pressure probe branch bar is hollow to install survey
Measure the Pitot tube of stagnation pressure.
4. measuring device according to claim 3, which is characterized in that the measuring device further includes air duct, the air duct
Blower barrel on section between total pressure measurement cross and air outlet, open up a static bole every 90 °, four
Static bole forms static pressure measurement ring.
5. measuring device according to claim 4, which is characterized in that be additionally provided with four circles on the blower barrel of the air duct
Hole, one end of four total pressure probes are fixed in four circular holes.
6. measuring device according to claim 5, which is characterized in that the data processing includes that differential pressure module, data are adopted
Collect module, microprocessor, display module and digital output module；
Differential pressure module one end connection total pressure measurement cross and static pressure measurement ring, the other end connect data by sensor and adopt
Collect module, the data acquisition module connects microprocessor.
7. measuring device according to claim 6, which is characterized in that the microprocessor is connected aobvious by digital output module
Show module.
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| CN201820888825.5U CN208333564U (en) | 2018-06-08 | 2018-06-08 | A kind of axial flow blower flow measurement device based on cross probe |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108896121A (en) * | 2018-06-08 | 2018-11-27 | 华北电力大学 | A kind of axial flow blower flow measurement device based on cross probe |
| CN113125103A (en) * | 2021-03-24 | 2021-07-16 | 中国空气动力研究与发展中心空天技术研究所 | Data processing method for elliptical cross-section flow meter with 41 measuring points equidistantly distributed |
-
2018
- 2018-06-08 CN CN201820888825.5U patent/CN208333564U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108896121A (en) * | 2018-06-08 | 2018-11-27 | 华北电力大学 | A kind of axial flow blower flow measurement device based on cross probe |
| CN113125103A (en) * | 2021-03-24 | 2021-07-16 | 中国空气动力研究与发展中心空天技术研究所 | Data processing method for elliptical cross-section flow meter with 41 measuring points equidistantly distributed |
| CN113125103B (en) * | 2021-03-24 | 2023-02-17 | 中国空气动力研究与发展中心空天技术研究所 | Data processing method for 41 measuring point equidistantly distributed oval cross-section flow meter |
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Granted publication date: 20190104 Termination date: 20200608 |