CN206788201U - A kind of Pitot tube component and the Flow speed measurer using the Pitot tube component - Google Patents

A kind of Pitot tube component and the Flow speed measurer using the Pitot tube component Download PDF

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Publication number
CN206788201U
CN206788201U CN201720657582.XU CN201720657582U CN206788201U CN 206788201 U CN206788201 U CN 206788201U CN 201720657582 U CN201720657582 U CN 201720657582U CN 206788201 U CN206788201 U CN 206788201U
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press
ram
air pipe
tube
static tube
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宋基
宋一基
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WUHAN RUNNENG SHIDAI TECHNOLOGY Co.,Ltd.
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宋一基
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Abstract

It the utility model is related to a kind of Pitot tube component and the Flow speed measurer using the Pitot tube component, Pitot tube component includes Pitot tube, Pitot tube includes ram-air pipe and static tube, ram-air pipe enters to press section and ram-air pipe to go out to press section including ram-air pipe, static tube enters to press section and static tube to go out to press section including static tube, the Pitot tube component also includes the first scavenging conduit and the second scavenging conduit being respectively communicated with ram-air pipe and static tube, ram-air pipe enters to press the net sectional area of section to go out to press the net sectional area of section more than ram-air pipe, static tube enters to press the net sectional area of section to go out to press the net sectional area of section more than static tube.Scavenging conduit can produce reverse effect to the air-flow that tested pipeline enters in Pitot tube, cause measurement result inaccurate, and ram-air pipe enters to press the net sectional area of section to go out to press the net sectional area of section more than ram-air pipe, static tube enters to press the net sectional area of section to go out to press the net sectional area of section more than static tube, pressure herein can be compensated, reduce influence of the scavenging conduit to test result.

Description

A kind of Pitot tube component and the Flow speed measurer using the Pitot tube component
Technical field
It the utility model is related to a kind of Pitot tube component and the Flow speed measurer using the Pitot tube component.
Background technology
Pitot tube is to measure air-flow stagnation pressure and static pressure to determine that a kind of measurement of air velocity is managed, and is widely used in cigarette In the complicated large-scale pipeline of the environment such as road, chemical plant, cement plant, boiler factory, to measure the flow of air in pipeline or cigarette air channel Pressure, finally converses air velocity.It is the most frequently used for S type Pitot tubes, including the ram-air pipe with pitot hole and baroport is quiet Pressure pipe, the direction of the direction of the pressure tappings of pitot hole and the pressure tappings of baroport is conversely, because in the tested pipeline of above-mentioned environment It is commonly present dust and internal pressure is frequently present of fluctuation, is easily caused ram-air pipe or static tube blocks, cause what can not be measured Problem.
In actual applications, maintainer periodically dredges after generation is blocked or to Pitot tube, causes to overhaul people Member's workload is larger.Authorization Notice No. is that the U of CN 201804021 Chinese utility model patent discloses a kind of integral type skin support Tube method Flow speed measurer, including Pitot tube, Pitot tube include ram-air pipe and static tube, and ram-air pipe enters to press section and complete including ram-air pipe Pressure pipe, which goes out, presses section, and static tube is divided into static tube including static tube and enters to press section and static tube to go out to press section, and static tube goes out to press Duan Shanglian Static pressure gas circuit is connected to, ram-air pipe goes out to press to be connected with dynamic pressure gas circuit in section, and static pressure gas circuit and dynamic pressure gas circuit are referred to as guiding gas circuit, Normally open solenoid valve is provided with static pressure gas circuit, normally open solenoid valve also is provided with dynamic pressure gas circuit, static pressure gas circuit and dynamic pressure gas circuit are led to respectively Cross scavenging pipeline and be connected with blowback source of the gas, normally closed solenoid valve is provided with each scavenging pipeline.When in use, normally opened electromagnetism is passed through The switching of valve and normally closed solenoid valve, so as to realize the measurement of system and blowing function.But when scavenging pipeline works, Pitot tube Can not normal work, there is certain security hidden trouble in the unit positioned at tested pipeline upstream, and if making Pitot tube and blowing Sweep pipeline while work, then the air-flow of blowback will certainly produce large effect to monitoring result, increase the error of measurement, lead Cause measurement result inaccurate.
Utility model content
The purpose of this utility model, which is to provide, a kind of not only with real time on-line monitoring but also can reduce the skin of measurement error Trustship component;Meanwhile the purpose of this utility model also resides in and provides a kind of Flow speed measurer using the Pitot tube component.
To achieve the above object, a kind of technical scheme of Pitot tube component of the present utility model is:A kind of Pitot tube component, Including Pitot tube, Pitot tube includes ram-air pipe and static tube, and ram-air pipe enters to press section and ram-air pipe to go out to press section including ram-air pipe, static pressure Pipe includes static tube and enters to press section and static tube to go out to press section, and the Pitot tube component also includes what is be respectively communicated with ram-air pipe and static tube First scavenging conduit and the second scavenging conduit, ram-air pipe enter to press the net sectional area of section to go out to press the net sectional area of section more than ram-air pipe, Static tube enters to press the net sectional area of section to go out to press the net sectional area of section more than static tube.
First scavenging conduit is extend into ram-air pipe and the inserting end of the first scavenging conduit crosses ram-air pipe and goes out to press section, and second Scavenging conduit is extend into static tube and the inserting end of the second scavenging conduit crosses static tube and goes out to press section, and ram-air pipe goes out to press effectively cutting for section Area is the cross-sectional area that ram-air pipe goes out to press the annular gap between section and the first scavenging conduit, and static tube goes out to press effectively cutting for section Area is the cross-sectional area that static tube goes out to press the annular gap between section and the second scavenging conduit.
The ram-air pipe and the first scavenging conduit are equal pipe;Or first scavenging conduit in ram-air pipe go out to press at section be provided with contracting Footpath section;Or ram-air pipe is provided with extension diameter section, extension diameter section forms the ram-air pipe and goes out to press section.
The static tube and the second scavenging conduit are equal pipe;Or second scavenging conduit in static tube go out to press at section be provided with contracting Footpath section;Or static tube is provided with extension diameter section, extension diameter section forms the static tube and goes out to press section.
First scavenging conduit stretches into ram-air pipe and the inserting end of the first scavenging conduit is located at ram-air pipe and goes out to press the remote of section Ram-air pipe enters to press the side of section, and ram-air pipe has undergauge section, and undergauge section forms ram-air pipe and goes out to press section.
Second scavenging conduit stretches into static tube and the inserting end of the second scavenging conduit is located at static tube and goes out to press the remote of section Static tube enters to press the side of section, and static tube has undergauge section, and undergauge section forms static tube and goes out to press section.
A kind of technical scheme of Flow speed measurer of the present utility model is:A kind of Flow speed measurer, including differential pressure transmitter Include Pitot tube with Pitot tube component, the Pitot tube component, Pitot tube includes ram-air pipe and static tube, and ram-air pipe includes complete Pressure pipe enters to press section and ram-air pipe to go out to press section, and static tube enters to press section and static tube to go out to press section including static tube, and the Pitot tube component is also Including the first scavenging conduit and the second scavenging conduit being respectively communicated with ram-air pipe and static tube, ram-air pipe enters to press the net sectional area of section Go out to press the net sectional area of section more than ram-air pipe, static tube enters to press the net sectional area of section to be more than static tube and goes out to press effectively cutting for section Area.
First scavenging conduit is extend into ram-air pipe and the inserting end of the first scavenging conduit crosses ram-air pipe and goes out to press section, and second Scavenging conduit is extend into static tube and the inserting end of the second scavenging conduit crosses static tube and goes out to press section, and ram-air pipe goes out to press effectively cutting for section Area is the cross-sectional area that ram-air pipe goes out to press the annular gap between section and the first scavenging conduit, and static tube goes out to press effectively cutting for section Area is the cross-sectional area that static tube goes out to press the annular gap between section and the second scavenging conduit.
The ram-air pipe and the first scavenging conduit are equal pipe;Or first scavenging conduit in ram-air pipe go out to press at section be provided with contracting Footpath section;Or ram-air pipe is provided with extension diameter section, extension diameter section forms the ram-air pipe and goes out to press section.
The static tube and the second scavenging conduit are equal pipe;Or second scavenging conduit in static tube go out to press at section be provided with contracting Footpath section;Or static tube is provided with extension diameter section, extension diameter section forms the static tube and goes out to press section.
First scavenging conduit stretches into ram-air pipe and the inserting end of the first scavenging conduit is located at ram-air pipe and goes out to press the remote of section Ram-air pipe enters to press the side of section, and ram-air pipe has undergauge section, and undergauge section forms ram-air pipe and goes out to press section.
Second scavenging conduit stretches into static tube and the inserting end of the second scavenging conduit is located at static tube and goes out to press the remote of section Static tube enters to press the side of section, and static tube has undergauge section, and undergauge section forms static tube and goes out to press section.
The beneficial effects of the utility model are:Ram-air pipe connects with the first scavenging conduit, and static tube connects with the second scavenging conduit, Because setting for scavenging conduit can produce reverse effect to the air-flow that tested pipeline enters in Pitot tube, measurement result is caused to be forbidden Really, and ram-air pipe enters to press the net sectional area of section to go out to press the net sectional area of section more than ram-air pipe, and static tube enters to press the effective of section Sectional area goes out to press the net sectional area of section more than static tube, and pressure herein can be compensated, and reduces scavenging conduit to test As a result influence.
Brief description of the drawings
Fig. 1 is the structural representation of the Pitot tube component in a kind of embodiment one of Flow speed measurer of the present utility model;
Fig. 2 is the structural representation of the Pitot tube component in a kind of embodiment two of Flow speed measurer of the present utility model;
Fig. 3 is the structural representation of the Pitot tube component in a kind of embodiment three of Flow speed measurer of the present utility model;
Fig. 4 is the structural representation of the Pitot tube component in a kind of example IV of Flow speed measurer of the present utility model.
Embodiment
Embodiment of the present utility model is described further below in conjunction with the accompanying drawings.
The specific embodiment one of a kind of Flow speed measurer of the present utility model, as shown in figure 1, including differential pressure transmitter, stream Amount integrating instrument and Pitot tube component, differential pressure transmitter be connected with flow integrator signal, Pitot tube component including Pitot tube and with The scavenging conduit of Pitot tube connection, Pitot tube include the ram-air pipe 7 with pitot hole 11 and the static tube 8 with baroport 12, entirely Pressure pipe 7 enters to press section 9 and ram-air pipe to go out to press section 5 including ram-air pipe, and static tube 8 enters to press section 10 and static tube to go out to press section including static tube 6, scavenging conduit include stretch into the first scavenging conduit 3 that is in ram-air pipe 7 and being connected with ram-air pipe 7 and stretch into it is in static tube 8 and with The second scavenging conduit 4 that static tube 8 connects.Total head guiding gas circuit, total head guiding gas are communicated between ram-air pipe 7 and differential pressure transmitter The one end on road is communicated in ram-air pipe and goes out to press section 5, and the other end is communicated in differential pressure transmitter.Connect between static tube 8 and differential pressure transmitter Static pressure guiding gas circuit is connected with, one end of static pressure guiding gas circuit is communicated in static tube and goes out to press section 6, and the other end is communicated in differential pressure transporting Device.
First scavenging conduit 3 stretches into ram-air pipe and the inserting end of the first scavenging conduit 3 crosses ram-air pipe and goes out to press section, the first purging The end part seal of pipe 3 and ram-air pipe coordinates.Second scavenging conduit 4 stretches into static tube and the inserting end of the second scavenging conduit 4 cross it is quiet Pressure pipe, which goes out, presses section, and the end part seal of the second scavenging conduit 4 and static tube coordinates.Ram-air pipe goes out to press between the scavenging conduit 3 of section 5 and first The cross-sectional area of annular gap forms the net sectional area that ram-air pipe goes out to press section 5, static tube go out to press the scavenging conduit 4 of section 6 and second it Between the cross-sectional area of annular gap form static tube and go out to press the net sectional area of section 6.Ensure that ram-air pipe enters to press the effective of section 9 Sectional area is more than the net sectional area that ram-air pipe goes out to press section 5, and static tube enters to press the net sectional area of section 10 to be more than static tube and goes out pressure The net sectional area of section 6, can be compensated to pressure herein, reduce influence of the scavenging conduit to test result.
First scavenging conduit 7 and the second scavenging conduit 8 are equal pipe, and pitot hole 11 and baroport 12 are also isometrical hole, and first blows The length that the length that pipe 3 is stretched into ram-air pipe 7 is less than ram-air pipe 7 is swept, the length that the second scavenging conduit 4 is stretched into static tube 8 is less than The length of static tube 8.Ram-air pipe 7 and static tube 8 are connected by purging gas circuit 2 with blowback source of the gas respectively.
In order to solve influence of the scavenging pipeline to measurement result, one is derived according to Bernoulli equation and continuity equation Compensation condition, from Bernoulli equation:
ΔPxDrag losses between --- --- section 1 and section 2;
Due to the flowing potential difference of 1,2 two sections gases, density contrast is negligible, obtains ρ1gH12gH2Therefore formula (1) can To make into
IfIt then can guarantee that P1=P2, the impulse measured value that can be achieved with section 2 is equivalent to section 1 True pressure measured value.
Due to ρ can be approximately considered12, make ρ12
Then:
By continuity equation:ρ SV=C (wherein, S represents area, and V represents speed, and C represents constant), it is known that:
Due to ρ can be approximately considered12, it is known that:ρ1S1V12S2V2
Formula (4) is brought into formula (3), it is known that:
On the other hand, from hydrodynamics drag computation method, drag losses and on-way resistance between 1~2 section Coefficient, coefficient of partial resistance, fluid density, kinetic energy are relevant.If total equivalent drag coefficients of the Z between 1~2 section, then resistance Lose Δ PxIt can be expressed as:
From formula (5), (6):
Understand:
Meet that the compensation condition meets formula (7), then scavenging pipeline will not have an impact to measurement result.
Wherein, Z is total equivalent drag coefficient between pressure tappings and corresponding impulse mouth, S1It is into pressing pitot hole 11 at section Net sectional area or baroport 12 net sectional area, S2It is to press the net sectional area of pitot hole 11 or baroport 12 at section Net sectional area, from formula (1), compensation condition is unrelated with purge flow rate, and this allows for measurement effect not by source of the gas pressure Power, the influence of gas flow change.In the present embodiment, Z is greater than zero numerical value, therefore S1It is naturally larger than S2, qualitatively, only Meet S1> S2, it is possible to reduce influence of the scavenging conduit to measurement result.
The specific embodiment two of a kind of Flow speed measurer of the present utility model, as shown in Fig. 2 with the difference of embodiment one only It is that the first scavenging conduit 3 is different with the structure of the second scavenging conduit 4, the first scavenging conduit 3 goes out to press at section 5 in ram-air pipe has the first contracting Footpath section 13, the second scavenging conduit 4 goes out to press in static tube has the second undergauge section 14 at section, ensures S1> S2
The specific embodiment three of a kind of Flow speed measurer of the present utility model, as shown in figure 3, existing with the difference of embodiment one Different from the structure of static tube 8 in ram-air pipe 7, ram-air pipe 7 and static tube 8 are reducer pipe, and ram-air pipe goes out to press section 5 to form ram-air pipe Ram-air pipe extension diameter section 13, static tube go out to press section 6 formed static tube static tube extension diameter section 14, ram-air pipe 7 and static tube 8 are Deng wall thickness tube, ensure S1> S2
The specific embodiment four of a kind of Flow speed measurer of the present utility model, as shown in figure 4, existing with the difference of embodiment one The difference of the position in static tube 8 and total head are stretched into the position that the first scavenging conduit 3 is stretched into ram-air pipe 7 difference, the second scavenging conduit 4 Pipe 7 is different from the structure of static tube 8.First scavenging conduit 3 stretches into ram-air pipe 7 and the inserting end of the first scavenging conduit 3 is located at total head Pipe goes out to press the remote ram-air pipe of section 5 to enter to press the side of section 9, and ram-air pipe goes out to press the ram-air pipe undergauge section of the formation ram-air pipe 7 of section 5.The Two scavenging conduits 4 stretch into static tube 8 and the inserting end of the second scavenging conduit 4 is located at static tube and goes out to press the remote static tube of section 6 to enter pressure The side of section 10, static tube go out to press the static tube undergauge section of the formation static tube 8 of section 6.Ram-air pipe 7 and static tube 8 such as are at the wall thickness Pipe, ensure S1> S2
In other embodiment of the present utility model, the first scavenging conduit can not also be extend into ram-air pipe, simply with entirely The end part seal connection of pressure pipe, the second scavenging conduit can not also be extend into static tube, and simply the end part seal with static tube connects It is logical;Ram-air pipe and the first scavenging conduit can be reducer pipe, but meet S1> S2;Static tube can be equal with the second scavenging conduit For reducer pipe, but to meet S1> S2;The structure of static tube and ram-air pipe can also differ;First scavenging conduit and second blows Sweeping the structure of pipe can also differ.
A kind of embodiment of Pitot tube component and the Pitot tube component in a kind of each embodiment of above-mentioned Flow speed measurer Structure is identical, and here is omitted.

Claims (7)

1. a kind of Pitot tube component, including Pitot tube, Pitot tube includes ram-air pipe and static tube, and ram-air pipe includes ram-air pipe and enters pressure Section and ram-air pipe go out to press section, and static tube enters to press section and static tube to go out to press section including static tube, it is characterised in that:The Pitot tube component Also include the first scavenging conduit and the second scavenging conduit being respectively communicated with ram-air pipe and static tube, ram-air pipe enters to press the effective cross-section of section Product goes out to press the net sectional area of section more than ram-air pipe, and static tube enters to press the net sectional area of section to go out to press the effective of section more than static tube Sectional area.
2. Pitot tube component according to claim 1, it is characterised in that:First scavenging conduit extend into ram-air pipe and The inserting end of first scavenging conduit crosses ram-air pipe and goes out to press section, and the second scavenging conduit is extend into static tube and the second scavenging conduit stretches into End crosses static tube and goes out to press section, and it is that ram-air pipe goes out to press between section and the first scavenging conduit that ram-air pipe, which goes out to press the net sectional area of section, The cross-sectional area of annular gap, it is that static tube goes out to press between section and the second scavenging conduit that static tube, which goes out to press the net sectional area of section, The cross-sectional area of annular gap.
3. Pitot tube component according to claim 2, it is characterised in that:The ram-air pipe is isometrical with the first scavenging conduit Pipe;Or first scavenging conduit go out to press in ram-air pipe undergauge section be provided with section;Or ram-air pipe is provided with extension diameter section, extension diameter section is formed The ram-air pipe goes out to press section.
4. Pitot tube component according to claim 2, it is characterised in that:The static tube is isometrical with the second scavenging conduit Pipe;Or second scavenging conduit go out to press in static tube undergauge section be provided with section;Or static tube is provided with extension diameter section, extension diameter section is formed The static tube goes out to press section.
5. Pitot tube component according to claim 1, it is characterised in that:First scavenging conduit stretches into ram-air pipe and The inserting end of one scavenging conduit is located at ram-air pipe and goes out to press the remote ram-air pipe of section to enter to press the side of section, and ram-air pipe has undergauge section, contracting Footpath section forms ram-air pipe and goes out to press section.
6. Pitot tube component according to claim 1, it is characterised in that:Second scavenging conduit stretches into static tube and The inserting end of two scavenging conduits is located at static tube and goes out to press the remote static tube of section to enter to press the side of section, and static tube has undergauge section, contracting Footpath section forms static tube and goes out to press section.
7. a kind of Flow speed measurer, including differential pressure transmitter and Pitot tube component, it is characterised in that:The Pitot tube component uses Pitot tube component described in claim any one of 1-6.
CN201720657582.XU 2017-06-06 2017-06-06 A kind of Pitot tube component and the Flow speed measurer using the Pitot tube component Active CN206788201U (en)

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CN201720657582.XU CN206788201U (en) 2017-06-06 2017-06-06 A kind of Pitot tube component and the Flow speed measurer using the Pitot tube component

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Application Number Priority Date Filing Date Title
CN201720657582.XU CN206788201U (en) 2017-06-06 2017-06-06 A kind of Pitot tube component and the Flow speed measurer using the Pitot tube component

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CN206788201U true CN206788201U (en) 2017-12-22

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108414788A (en) * 2018-02-11 2018-08-17 河海大学 A kind of open channel uniform flow horizontal direction multiple spot tachymeter device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108414788A (en) * 2018-02-11 2018-08-17 河海大学 A kind of open channel uniform flow horizontal direction multiple spot tachymeter device

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Effective date of registration: 20210528

Address after: 430000 comprehensive unit, building A6, phase 41, optical valley software park, 1 Guanshan Avenue, Donghu New Technology Development Zone, Wuhan City, Hubei Province

Patentee after: WUHAN RUNNENG SHIDAI TECHNOLOGY Co.,Ltd.

Address before: 075000 No.233, building 9, power plant dormitory, xihuayuan street, Xiahuayuan District, Zhangjiakou City, Hebei Province

Patentee before: Song Yiji

TR01 Transfer of patent right