CN108759948A - A kind of built-in rectifier of gas ultrasonic flowmeter - Google Patents
A kind of built-in rectifier of gas ultrasonic flowmeter Download PDFInfo
- Publication number
- CN108759948A CN108759948A CN201811008180.2A CN201811008180A CN108759948A CN 108759948 A CN108759948 A CN 108759948A CN 201811008180 A CN201811008180 A CN 201811008180A CN 108759948 A CN108759948 A CN 108759948A
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- cellular
- rectification
- tube body
- flow
- ultrasonic flowmeter
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- 230000001413 cellular effect Effects 0.000 claims abstract description 65
- 238000013016 damping Methods 0.000 claims abstract description 32
- 239000006260 foam Substances 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 238000004080 punching Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 12
- 238000007596 consolidation process Methods 0.000 abstract description 6
- 238000004904 shortening Methods 0.000 abstract description 6
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 238000003786 synthesis reaction Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 23
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- -1 foam copper Chemical class 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009954 braiding Methods 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000009941 weaving Methods 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
- G01F1/66—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 measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
-
- 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
- G01F1/66—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 measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/662—Constructional details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/001—Means for regulating or setting the meter for a predetermined quantity
- G01F15/002—Means for regulating or setting the meter for a predetermined quantity for gases
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Measuring Volume Flow (AREA)
- Details Of Flowmeters (AREA)
Abstract
The invention discloses a kind of built-in rectifiers of gas ultrasonic flowmeter, further include that at least one damping screen for reducing turbulent air flow being arranged between two adjacent cellular cowling panels is set including rectification tube body and along at least two cellular cowling panels that rectification tube body is axially arranged；The flow development length for shortening ultrasonic flowmeter can be reached by cellular cowling panel, and achieve the purpose that the tangential velocity for adjusting air-flow so that all consolidations of the directional velocity of air-flow are consistent, i.e., along the center line of rectification tube body；By the way that damping screen is arranged between two adjacent cellular cowling panels, in cellular on the basis of the adjusting effect of cowling panel of guarantee, normal velocity of the air-flow on pipeline section can be adjusted, it can also reduce the turbulivity of air-flow in the flowing direction simultaneously, rectification is carried out to air-flow to achieve the purpose that cellular cowling panel is combined synthesis with damping screen, improves the stability and uniformity of air-flow.
Description
Technical field
The present invention relates to rectifier technical field, more particularly to the built-in rectifier of a kind of gas ultrasonic flowmeter.
Background technology
With the fast development of digital instrument especially ultrasonic flowmeter technology, a large amount of ultrasonic flowmeter has been widely used
In the measurement of the gases such as natural gas, oil gas and coal gas.In practical applications, gas ultrasonic flowmeter installs and uses condition ratio
Relatively severe, the straight pipe of upstream and downstream is shorter, and the gas flow rate being evenly distributed can not be formed in ultrasonic flowmeter, influences to surpass
The measuring accuracy of sonic flowmeter.Therefore it usually requires to arrange longer straight pipe and gasotron in the front end of flowmeter.
Currently, disclosing a variety of multiaperture-type rectifiers in the prior art, typically non-uniform gas is passed through porous
Plate carries out rearrangement, to form equally distributed gas flow rate.These gasotrons due to component length dimension compared with
Greatly, the distribution of gas flow rate can be improved under certain effect, but can not all accomplishes that front and back flow development length does not influence hypersonic flow
The measuring accuracy requirement of gauge.And ideal rectification effect is not achieved using the ultrasonic flowmeter of common cowling panel in the prior art
Fruit, rectification effect is bad to be susceptible to timing error, it is difficult to get stable signal.
Invention content
In view of this, the present invention provides a kind of built-in rectifier of gas ultrasonic flowmeter, reaching shortening ultrasonic flow rate
The flow development length of meter, and by adjust so that the directional velocity of air-flow all consolidation is consistent while, can also be to air-flow in pipeline
Normal velocity on section is adjusted, while can also reduce the turbulivity of air-flow in the flowing direction, to improve air-flow
Stability and uniformity.
The built-in rectifier of the gas ultrasonic flowmeter of the present invention, including rectification tube body and be axially arranged along rectification tube body
At least two cellular cowling panels, further include be arranged be arranged between two adjacent cellular cowling panels it is at least one for reducing
The damping screen of turbulent air flow.Wherein, several rectification holes along rectification tube body axial direction are provided on cellular cowling panel, and several whole
It is arranged into honeycomb structure between discharge orifice, the section of each rectification hole is the hole of regular hexagon, and each cellular rectification
Thickness of the plate in rectification tube body axial direction is 16-20 times of the honeycomb rectification hole length of side；By two adjacent cellular cowling panels it
Between damping screen is set, while carrying out rectification, achieve the purpose that reduce wind speed and reduce turbulent flow.
Further, damping screen includes grid ontology and is adjacent to for fixed mesh ontology and with rectifying tube body inner circumferential
The axial both ends of chuck, the chuck are closely arranged with adjacent cellular cowling panel respectively, and grid ontology is in rectification tube body
In axial direction spacing is being all had between adjacent two cellular cowling panels.Wherein, damping screen is by a plurality of transverse steel wire and a plurality of
Longitudinal steel wire intersect braiding made of reticular structure, it is orthogonal between transverse steel wire and longitudinal steel wire, reticular structure
Mesh forms damping through-hole；The flow development length for shortening ultrasonic flowmeter can be reached by cellular cowling panel, and reach whole
Determine the purpose of the tangential velocity of air-flow so that all consolidations of the directional velocity of air-flow are consistent, i.e., along the center line of rectification tube body；It is logical
It crosses and damping screen is set between two adjacent cellular cowling panels, it, can in cellular on the basis of the adjusting effect of cowling panel of guarantee
Normal velocity of the air-flow on pipeline section is adjusted, while can also reduce the turbulivity of air-flow in the flowing direction, from
And achieve the purpose that cellular cowling panel with damping screen be combined it is comprehensive rectification is carried out to air-flow, improve the stability and of air-flow
Even property.
Further, further include being arranged in rectification tube body air inlet one end and with the multiple holes plate of porous structure, and near whole
The cellular cowling panel of flow tube body air inlet one end setting is closely arranged with the multiple holes plate.It can be to entering rectification by multiple holes plate
The air-flow of tube body carries out advance rectification, then carries out rectification again through cellular cowling panel again, and cellular cowling panel setting exists
The axis of rectification tube body sets up at least two, multi-stage rectifying structure is formed, before capable of substituting existing ultrasonic flowmeter completely
The straight pipe being arranged afterwards greatly reduces the installation volume of ultrasonic flowmeter, and significantly ideal rectification effect.
Further, multiple holes plate of foam metal sheet punching by being made.Advance rectification is carried out in the gas to entrance
At the same time it can also achieve the purpose that noise reduction；Foam metal sheet can be the metals such as foam copper, foamed aluminium and nickel foam, not only have
There is preferable rust-preventing characteristic, but also with sound-absorbing, heat-insulated, vibration damping and absorbs the characteristics such as impact energy and electromagnetic wave.
Further, the first inner ring for being positioned to cellular cowling panel is formed on the inside of outlet one end of rectification tube body
Air inlet one end of platform, the rectification tube body is formed with land in second for being positioned to multiple holes plate.
Further, further include with air inlet one end of rectification tube body formed end face connect and by multiple holes plate, honeycomb fashion cowling panel
With damping screen along the baffle ring of rectification tube body axial compression.
Further, several rectification holes at cellular arrangement are formed on cellular cowling panel, and each rectification hole is just
Hexagonal hole.
Further, axially the upper spacing between adjacent two cellular cowling panels is equal in rectification tube body for grid ontology, institute
It is 2-5mm to state spacing.
Beneficial effects of the present invention：The built-in rectifier of the gas ultrasonic flowmeter of the present invention, passes through cellular cowling panel
The flow development length for shortening ultrasonic flowmeter can be reached, and achieve the purpose that the tangential velocity for adjusting air-flow so that air-flow
Directional velocity all consolidations are consistent, i.e., along the center line of rectification tube body；By the way that resistance is arranged between two adjacent cellular cowling panels
Buddhist nun's net can carry out normal velocity of the air-flow on pipeline section in cellular on the basis of the adjusting effect of cowling panel of guarantee
It adjusts, while can also reduce the turbulivity of air-flow in the flowing direction, be combined with damping screen to reach cellular cowling panel
The comprehensive purpose that rectification is carried out to air-flow, improves the stability and uniformity of air-flow.
Description of the drawings
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is overall structure of the present invention.
Specific implementation mode
Technical solution in the embodiment of the present invention that following will be combined with the drawings in the embodiments of the present invention carries out clear, complete
Description, it is clear that described embodiment be only the present invention a part of the embodiment, instead of all the embodiments.It is based on
The embodiment of the present invention, every other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, shall fall within the protection scope of the present invention.
It is to be appreciated that the directional instruction of institute in the embodiment of the present invention（Such as up, down, left, right, before and after ...）Only use
In a certain particular pose of explanation（As shown in the picture）Under relative position relation, motion conditions etc. between each component, if the spy
When determining posture and changing, then directionality instruction also correspondingly changes correspondingly.
In addition, the description for being related to " first ", " second " etc. in the present invention is used for description purposes only, and should not be understood as referring to
Show or imply its relative importance or implicitly indicates the quantity of indicated technical characteristic." first ", " are defined as a result,
Two " feature can explicitly or implicitly include at least one of the features.In addition, the technical solution between each embodiment can
To be combined with each other, but must can be implemented as basis with those of ordinary skill in the art, when the combination of technical solution occurs
Conflicting or cannot achieve when, will be understood that the combination of this technical solution is not present, also not the present invention claims protection model
In enclosing.
The present invention proposes a kind of built-in rectifier of gas ultrasonic flowmeter.
Referring to Fig.1, Fig. 1 is the overall structure diagram of the built-in rectifier of gas ultrasonic flowmeter in the present invention, is such as schemed
It is shown：The built-in rectifier of the gas ultrasonic flowmeter of the present embodiment, including rectification tube body 1 and along the axial setting of rectification tube body 1
At least two cellular cowling panels 2, further include that between two adjacent cellular cowling panels be arranged at least one is arranged to be used for
Reduce the damping screen of turbulent air flow.Wherein, it is provided on cellular cowling panel 2 along the axial several rectification holes of rectification tube body 1, and
It is arranged into honeycomb structure between several rectification holes, the section of each rectification hole is the hole of regular hexagon, and each honeycomb
Thickness of the formula cowling panel 2 in 1 axial direction of rectification tube body is 16-20 times of the honeycomb rectification hole length of side；By in two adjacent honeycomb fashions
Damping screen is set between cowling panel 2, while carrying out rectification, achievees the purpose that reduce wind speed and reduces turbulent flow.
In the present embodiment, damping screen include grid ontology 3 and for fixed mesh ontology 3 and with the inside of rectification tube body 1 week
To the chuck 4 being adjacent to, the axial both ends of the chuck 4 are closely arranged with adjacent cellular cowling panel 2 respectively, and grid ontology
3 are all having spacing between the axial two upper and adjacent cellular cowling panels of rectification tube body 1.Wherein, damping screen is by a plurality of cross
Intersect reticular structure made of weaving to steel wire and a plurality of longitudinal steel wire, hangs down mutually between transverse steel wire and longitudinal steel wire
Directly, the mesh of reticular structure forms damping through-hole；The straight pipe for shortening ultrasonic flowmeter can be reached by cellular cowling panel 2
Length, and achieve the purpose that the tangential velocity for adjusting air-flow so that all consolidations of the directional velocity of air-flow are consistent, i.e., along rectifying tube
The center line of body 1；By the way that damping screen is arranged between two adjacent cellular cowling panels 2, ensureing adjusting for cellular cowling panel 2
On the basis of effect, normal velocity of the air-flow on pipeline section can be adjusted, while can also reduce air-flow in flowing side
Upward turbulivity carries out rectification to air-flow to achieve the purpose that cellular cowling panel 2 is combined synthesis with damping screen, improves
The stability and uniformity of air-flow.
Further include being arranged in 1 air inlet one end of rectification tube body and with the multiple holes plate 5 of porous structure, and most in the present embodiment
Cellular cowling panel 2 close to the 1 air inlet one end setting of rectification tube body is closely arranged with the multiple holes plate 5.It can by multiple holes plate 5
Air-flow to entering rectification tube body 1 carries out advance rectification, then carries out rectification again through cellular cowling panel 2 again, and cellular
Cowling panel 2 is arranged the axis in rectification tube body 1 and sets up at least two, forms multi-stage rectifying structure, can substitute completely existing
The front and back straight pipe being arranged of ultrasonic flowmeter, greatly reduces the installation volume of ultrasonic flowmeter, and more manage significantly
The rectification effect thought.
In the present embodiment, multiple holes plate 5 of foam metal sheet punching by being made.It is carried out in the gas to entrance whole in advance
While stream, the purpose of noise reduction may also reach up；Foam metal sheet can be the metals such as foam copper, foamed aluminium and nickel foam, no
But there is preferable rust-preventing characteristic, but also with sound-absorbing, heat-insulated, vibration damping and absorb the characteristics such as impact energy and electromagnetic wave.
In the present embodiment, first for being positioned to cellular cowling panel 2 is formed on the inside of outlet one end of rectification tube body 1
Air inlet one end of interior land 6, the rectification tube body 1 is formed with land 7 in second for being positioned to multiple holes plate 5.
In the present embodiment, further include with air inlet one end of rectification tube body 1 formed end face connect and by multiple holes plate 5, honeycomb fashion
The baffle ring 8 of cowling panel 2 and damping screen along 1 axial compression of rectification tube body.
In the present embodiment, several rectification holes at cellular arrangement are formed on cellular cowling panel 2, and each rectification hole is equal
For hexagonal hole.Grid ontology 3 is equal in the axial upper spacing between adjacent two cellular cowling panels of rectification tube body 1, institute
It is 2-5mm to state spacing.
The built-in rectifier of gas ultrasonic flowmeter i.e. in the present invention, air-flow enters in rectification pipeline, first through porous
The multiple holes plate 5 of structure can carry out advance rectification by multiple holes plate 5 to the air-flow for entering rectification tube body 1, multiple holes plate 5 is by steeping
Foam sheet metal punching is made, i.e., while the gas to entrance carries out advance rectification, may also reach up the purpose of noise reduction；Gas
It is directly entered after flowing through multiple holes plate 5, then carries out rectification again through cellular cowling panel 2 again, and the cellular setting of cowling panel 2 exists
The axis of rectification tube body 1 sets up at least two, multi-stage rectifying structure is formed, before capable of substituting existing ultrasonic flowmeter completely
The straight pipe being arranged afterwards greatly reduces the installation volume of ultrasonic flowmeter, and significantly ideal rectification effect, and
Damping screen is set between two adjacent cellular cowling panels 2, it, can in guarantee honeycomb fashion cowling panel 2 on the basis of adjusting effect
Normal velocity of the air-flow on pipeline section is adjusted, while can also reduce the turbulivity of air-flow in the flowing direction, from
And achieve the purpose that cellular cowling panel 2 with damping screen be combined it is comprehensive rectification is carried out to air-flow, improve air-flow stability and
Uniformity.
And a determining deviation is all had between the grid ontology 3 of damping screen and adjacent two cellular cowling panels 2, so not
But so that there is spacing between grid ontology 3 and cellular cowling panel 2, equally have between two adjacent cellular cowling panels 2
Spacing so that certain breeze way is formed between 2 and two adjacent honeycomb fashion cowling panel 2 of damping screen and cellular cowling panel,
I.e. along airflow direction, after previous cellular cowling panel 2, the fluidised form of air-flow obtains the equilibrium of first time, is formed more
Stable form, but since rectification hole itself has certain thickness, length also shorter so that the air-flow of outflow is easy
Rectification hole attachment forms disorder, causes VELOCITY DISTRIBUTION unbalanced, and air flow press molding changes, and unstable fluidised form occurs in part, leads to
Setting spacing is crossed, air-flow may make to form certain buffering, prevents the household of race conditio, and played under the action of damping screen
The purpose that normal velocity to air flow resistance reduction of speed and on pipeline section is adjusted.
The present invention gas ultrasonic flowmeter built-in rectifier, by cellular cowling panel 2 can reach shortening its into
The length of gas straight pipe, and achieve the purpose that the tangential velocity for adjusting air-flow so that all consolidations of the directional velocity of air-flow are consistent, i.e.,
Along the center line of rectification tube body 1；By the way that damping screen is arranged between two adjacent cellular cowling panels 2, ensureing that honeycomb fashion is whole
Flowing plate 2 adjust effect on the basis of, normal velocity of the air-flow on pipeline section can be adjusted, while can also reduce gas
The turbulivity of stream in the flowing direction is combined synthesis to air-flow progress rectification to reach cellular cowling panel 2 with damping screen
Purpose, improve the stability and uniformity of air-flow.
Finally illustrate, the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although with reference to compared with
Good embodiment describes the invention in detail, it will be understood by those of ordinary skill in the art that, it can be to the skill of the present invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at this
In the right of invention.
Claims (8)
1. a kind of built-in rectifier of gas ultrasonic flowmeter, it is characterised in that：Including rectification tube body and along rectification tube body axial direction
At least two cellular cowling panels being arranged further include that at least one use being arranged between two adjacent cellular cowling panels is arranged
In the damping screen for reducing turbulent air flow.
2. the built-in rectifier of gas ultrasonic flowmeter according to claim 1, it is characterised in that：The damping screen includes
Grid ontology and the chuck being adjacent to for fixed mesh ontology and with rectifying tube body inner circumferential, the axial both ends point of the chuck
It is not arranged closely with adjacent cellular cowling panel, and the two cellular rectifications that grid ontology is upper and adjacent in rectification tube body axial direction
Spacing is being all had between plate.
3. the built-in rectifier of gas ultrasonic flowmeter according to claim 2, it is characterised in that：Further include being arranged whole
Flow tube body air inlet one end and the multiple holes plate with porous structure, and near the cellular rectification of rectification tube body air inlet one end setting
Plate is closely arranged with the multiple holes plate.
4. the built-in rectifier of gas ultrasonic flowmeter according to claim 3, it is characterised in that：The multiple holes plate is served as reasons
Foam metal sheet punching is made.
5. the built-in rectifier of gas ultrasonic flowmeter according to claim 4, it is characterised in that：The rectification tube body
It is formed with land in first for being positioned to cellular cowling panel, air inlet one end shape of the rectification tube body on the inside of outlet one end
At be useful for multiple holes plate position second in land.
6. the built-in rectifier of gas ultrasonic flowmeter according to claim 5, it is characterised in that：Further include and rectifying tube
Air inlet one end of body forms end face connection and the gear by multiple holes plate, cellular cowling panel and damping screen along rectification tube body axial compression
Circle.
7. the built-in rectifier of gas ultrasonic flowmeter according to claim 6, it is characterised in that：The honeycomb fashion rectification
Several rectification holes at cellular arrangement are formed on plate, and each rectification hole is hexagonal hole.
8. the built-in rectifier of gas ultrasonic flowmeter according to claim 7, it is characterised in that：The grid ontology exists
Axially the upper spacing between adjacent two cellular cowling panels is equal for rectification tube body, and the spacing is 2-5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811008180.2A CN108759948A (en) | 2018-08-31 | 2018-08-31 | A kind of built-in rectifier of gas ultrasonic flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811008180.2A CN108759948A (en) | 2018-08-31 | 2018-08-31 | A kind of built-in rectifier of gas ultrasonic flowmeter |
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| Publication Number | Publication Date |
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| CN108759948A true CN108759948A (en) | 2018-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811008180.2A Pending CN108759948A (en) | 2018-08-31 | 2018-08-31 | A kind of built-in rectifier of gas ultrasonic flowmeter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111272382A (en) * | 2020-03-31 | 2020-06-12 | 杭州佐格通信设备有限公司 | Damping net mounting structure of wind tunnel and wind tunnel |
| CN113252293A (en) * | 2021-06-08 | 2021-08-13 | 中国空气动力研究与发展中心低速空气动力研究所 | Gas rectification structure inside box body |
| CN113903243A (en) * | 2021-11-18 | 2022-01-07 | 上汽通用汽车有限公司 | Pneumatic resistance piece and scaling automobile model |
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