CN106940211A - A kind of wing mean velocity tube flowmeter - Google Patents
A kind of wing mean velocity tube flowmeter Download PDFInfo
- Publication number
- CN106940211A CN106940211A CN201710128390.4A CN201710128390A CN106940211A CN 106940211 A CN106940211 A CN 106940211A CN 201710128390 A CN201710128390 A CN 201710128390A CN 106940211 A CN106940211 A CN 106940211A
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- China
- Prior art keywords
- tube
- groups
- streamlined
- even speed
- hole
- 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
Links
- 238000005259 measurement Methods 0.000 claims abstract description 33
- 239000012530 fluid Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
Classifications
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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
-
- 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
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a kind of wing mean velocity tube flowmeter, including measurement pipeline, pressure measuring valve and blowoff valve, streamlined even speed tube is provided with the measurement pipeline, offer that malleation collects hole and negative pressure collects hole in the streamlined even speed tube, meeting for the streamlined even speed tube offer five groups of positive pressure sensing holes on stream end face, length direction of five groups of positive pressure sensing holes along the streamlined even speed tube is distributed in log-linear, five groups of negative pressure sensing holes are offered on the two sides of the streamlined even speed tube, length direction of the pressure sensing hole along streamlined average rate tube body is born described in five groups to be distributed in log-linear, the determination of this principle is tried to achieve by log-linear measurement, log-linear measurement is proved according to experiment, its error is no better than zero, therefore its measurement accuracy is higher.
Description
Technical field
The present invention relates to a kind of wing mean velocity tube flowmeter.
Background technology
Wing mean velocity tube flowmeter is mainly used in the flow measurement of air quantity system in large scale industry pipeline, because fluid exists
Velocity flow profile in pipeline is：Close to the air measuring that flow velocity at tube wall is most slow, flow velocity at pipeline center is most fast, general
Device is the flow velocity for measuring single-point in pipeline, so that the flow in pipeline is calculated, due to the inhomogeneities of flow velocity in pipeline,
So single-point flow velocity can not embody the true flow condition in pipeline, as shown in figure 1, the flow velocity in pipeline is curved arrangement
, i.e. center flow velocity highest is minimum along tube wall flow velocity, when entering and popping one's head in built in pipeline, because flow velocity is different, so each point sense
The pressure received is also that different, conventional measurement apparatus are that pressure sensing hole is averagely opened on probe or single point pressure is measured,
The pressure so measured is extremely inaccurate, so as to bring the inaccurate result of measurement.
Additionally, due to the general pressure of air quantity system is relatively low, flow is small, so as to cause signal small, this brings to normal measurement
Very big difficulty.
The content of the invention
It is an object of the invention to overcoming defect present in prior art there is provided a kind of measurement accuracy is high, signal is strong
Wing mean velocity tube flowmeter.
To achieve the above object, the technical scheme is that there is provided a kind of wing mean velocity tube flowmeter, including measurement
Streamline is radially provided with pipeline, the pressure measuring valve and blowoff valve being connected with the measurement pipeline, the measurement pipeline
Offer that malleation collects hole and negative pressure collects hole, institute in shape even speed tube, the streamlined even speed tube respectively along its length
State to meet for streamlined even speed tube offer on stream end face and collect five groups of positive pressure sensing holes that hole is connected with the malleation, five groups are just felt
Length direction of the hole along the streamlined even speed tube is pressed to be distributed in log-linear, the position of positive pressure sensing hole is followed successively by described in five groups
Offer and born with described on 0.277R, 0.566R, 0.695R, 0.847R, 0.962R, the two sides of the streamlined even speed tube
Pressure collects five groups of negative pressure sensing holes that hole is connected, and length direction of the pressure sensing hole along streamlined average rate tube body is born described in five groups and is in
Log-linear is distributed, bear described in each five groups of both sides pressure sensing hole position be followed successively by 0.277R, 0.566R, 0.695R ,=0.847R,
0.962R, wherein R are the radius of measurement pipeline.
It is further improved to be：The both sides of the streamlined even speed tube are symmetrically arranged with wing flow deflector.
It is further improved to be：The wing flow deflector is obliquely installed.
It is further improved to be：The pressure measuring valve is vertically connected at the top of the measurement pipeline, and the blowoff valve is vertical
It is connected to the lower section of the measurement pipeline.
The advantages of the present invention are：
1st, the flow velocity in measurement pipeline is divided into 5 mean flow rate faces, and the determination of this principle is tried to achieve by log-linear measurement,
Log-linear measurement is according to it is demonstrated experimentally that its error is no better than zero, therefore its measurement accuracy is higher；
2nd, streamlined average rate tube body type shape meets principle of hydrodynamics, and self-rectifying effect can be carried out to fluid；
3rd, the effect of wing flow deflector flows through a fluid stream of streamlined average rate tube body and obtains rectification, and makes the fluid of suction side
Increase due to the contraction of flow area, so that suction side pressure is reduced, so that the measurement of wing mean velocity tube flowmeter is poor
Pressure is exaggerated, and is improved measurement accuracy.
Brief description of the drawings
Fig. 1 is the schematic diagram of prior art；
Fig. 2 is schematic diagram of the invention；
Fig. 3 is Fig. 2 schematic cross-section.
Wherein：1st, pipeline is measured；2nd, pressure measuring valve；3rd, streamlined even speed tube；4th, wing flow deflector；5th, blowoff valve；6th, malleation
Collect hole；7th, negative pressure collects hole.
Embodiment
With reference to the accompanying drawings and examples, the embodiment to the present invention is further described.Following examples are only
For clearly illustrating technical scheme, and it can not be limited the scope of the invention with this.
As shown in Figure 2 and Figure 3, wing mean velocity tube flowmeter, including measure pipeline 1, measure what pipeline 1 was connected with described
Streamlined even speed tube 3, the streamlined average rate are radially provided with pressure measuring valve 2 and blowoff valve 5, the measurement pipeline 1
Offer that malleation collects hole 6 and negative pressure collects hole 7 in pipe 3 respectively along its length, the streamlined even speed tube 3 meets stream
Offered on end face and collect five groups of positive pressure sensing holes that hole 6 is connected with the malleation, five groups of positive pressure sensing holes are along the streamlined
The length direction of even speed tube 3 in log-linear be distributed, the position of positive pressure sensing hole described in five groups be followed successively by 0.277R, 0.566R,
Offered on 0.695R, 0.847R, 0.962R, the two sides of the streamlined even speed tube 3 and collect hole 7 with the negative pressure and be connected
The negative pressure sensing hole of logical five groups, bears length direction of the pressure sensing hole along the body of streamlined even speed tube 3 in log-linear point described in five groups
Cloth, the position of negative pressure sensing hole is followed successively by 0.277R, 0.566R, 0.695R ,=0.847R, 0.962R described in each five groups of both sides, wherein
R is the radius of measurement pipeline 1.
The equal flow tube of streamlined is met into principle of hydrodynamics using streamline shape, and self-rectifying work can be carried out to fluid
With.
In order to further improve rectification effect, the both sides of the streamlined even speed tube 3 are symmetrically arranged with wing flow deflector 4,
Further preferred scheme is：The wing flow deflector 4 is obliquely installed, and a fluid stream for then flowing through streamlined even speed tube 3 obtains whole
Stream, and the fluid of suction side is increased due to the contraction of flow area, so that suction side pressure is reduced, so that wing
The measurement differential pressure of even speed tube apparatus for measuring air quantity is exaggerated, and is improved measurement accuracy.
It is preferred embodiment that the pressure measuring valve 2 is vertically connected at the top of the measurement pipeline 1 in the present embodiment,
The blowoff valve 5 is vertically connected at the lower section of the measurement pipeline 1.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, on the premise of the technology of the present invention principle is not departed from, some improvements and modifications can also be made, these improvements and modifications
Also it should be regarded as protection scope of the present invention.
Claims (4)
1. a kind of wing mean velocity tube flowmeter, including measure pipeline, the pressure measuring valve being connected with the measurement pipeline and blowdown
Valve, it is characterised in that:Radially it is provided with the measurement pipeline in streamlined even speed tube, the streamlined even speed tube along it
The malleation that length direction offers respectively collects hole and negative pressure collects hole, and being met for the streamlined even speed tube offered on stream end face
Collect five groups of positive pressure sensing holes that hole is connected, length side of five groups of positive pressure sensing holes along the streamlined even speed tube with the malleation
Be distributed in log-linear, the position of positive pressure sensing hole described in five groups be followed successively by 0.277R, 0.566R, 0.695R, 0.847R,
Offered on 0.962R, the two sides of the streamlined even speed tube and collect five groups of negative pressure-sensitive that hole is connected with the negative pressure
Hole, bears length direction of the pressure sensing hole along streamlined average rate tube body and is distributed in log-linear described in five groups, each five groups of institutes in both sides
The position for stating negative pressure sensing hole is followed successively by 0.277R, 0.566R, 0.695R ,=0.847R, 0.962R, and wherein R is the half of measurement pipeline
Footpath.
2. the wing mean velocity tube flowmeter as described in right 1, it is characterised in that：The both sides of the streamlined even speed tube are symmetrically arranged with
Wing flow deflector.
3. the wing mean velocity tube flowmeter as described in right 1, it is characterised in that：The wing flow deflector is obliquely installed.
4. the wing mean velocity tube flowmeter as described in right 1, it is characterised in that：The pressure measuring valve is vertically connected at the measurement pipeline
Top, the blowoff valve be vertically connected at it is described measurement pipeline lower section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710128390.4A CN106940211A (en) | 2017-03-06 | 2017-03-06 | A kind of wing mean velocity tube flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710128390.4A CN106940211A (en) | 2017-03-06 | 2017-03-06 | A kind of wing mean velocity tube flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106940211A true CN106940211A (en) | 2017-07-11 |
Family
ID=59469488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710128390.4A Pending CN106940211A (en) | 2017-03-06 | 2017-03-06 | A kind of wing mean velocity tube flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106940211A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87212304U (en) * | 1987-09-05 | 1988-09-28 | 马鞍山钢铁公司 | Multi-hole velocity tube flowmeter with streamline section |
| CN1590973A (en) * | 2003-09-04 | 2005-03-09 | 温汉璋 | Uniform speed flow measuring device possessing speed raising function |
| CN201819708U (en) * | 2010-06-07 | 2011-05-04 | 孙立军 | Uniform-speed tube flow sensor with flow distributing wings |
| CN202631014U (en) * | 2012-06-11 | 2012-12-26 | 江阴市节流装置厂有限公司 | Three-curve-airfoil rectifying type air flow device |
| US20150114136A1 (en) * | 2013-10-28 | 2015-04-30 | Dae Han Instrument Co., Ltd. | Average Pitot Tube Type Flow Meter |
| CN105043481A (en) * | 2015-05-04 | 2015-11-11 | 大连理工大学 | Pentagonal velocity-averaging tube |
-
2017
- 2017-03-06 CN CN201710128390.4A patent/CN106940211A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87212304U (en) * | 1987-09-05 | 1988-09-28 | 马鞍山钢铁公司 | Multi-hole velocity tube flowmeter with streamline section |
| CN1590973A (en) * | 2003-09-04 | 2005-03-09 | 温汉璋 | Uniform speed flow measuring device possessing speed raising function |
| CN201819708U (en) * | 2010-06-07 | 2011-05-04 | 孙立军 | Uniform-speed tube flow sensor with flow distributing wings |
| CN202631014U (en) * | 2012-06-11 | 2012-12-26 | 江阴市节流装置厂有限公司 | Three-curve-airfoil rectifying type air flow device |
| US20150114136A1 (en) * | 2013-10-28 | 2015-04-30 | Dae Han Instrument Co., Ltd. | Average Pitot Tube Type Flow Meter |
| CN105043481A (en) * | 2015-05-04 | 2015-11-11 | 大连理工大学 | Pentagonal velocity-averaging tube |
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Application publication date: 20170711 |