CN106762244B - The measurement pipeline of engine EGR exhaust gas flow - Google Patents
The measurement pipeline of engine EGR exhaust gas flow Download PDFInfo
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- CN106762244B CN106762244B CN201611264459.8A CN201611264459A CN106762244B CN 106762244 B CN106762244 B CN 106762244B CN 201611264459 A CN201611264459 A CN 201611264459A CN 106762244 B CN106762244 B CN 106762244B
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Abstract
The invention discloses a kind of measurement pipelines of engine EGR exhaust gas flow.The measurement pipeline includes: Venturi tube comprising: entrance, contraction section, throat and diffuser offer the first pressure tappings on the entrance, the second pressure tappings are offered in the throat；The diameter of first pressure tappings and the second pressure tappings is identical, and the contraction section is cone, and the length of the throat is at least four times of the second pressure tappings diameter, and the diameter of the throat is 0.4~0.6 times of the diameter of entrance；The diffuser is cone, and outlet diameter is less than the diameter of the entrance；Sebific duct；And diffuser, one end are connect by the sebific duct with the diffuser of the Venturi tube, the other end is connect with engine air inlet tube.The pipeline for using one section of actual internal area to be gradually increased after the Venturi tube of the measurement pipeline to be connected with engine charge pipeline, can reduce the pressure drop of entire measurement pipeline.
Description
Technical field
The present invention relates to the fields of measurement of engine EGR exhaust gas flow, in particular to a kind of engine EGR exhaust gas flow
Measure pipeline.
Background technique
As engine emission regulation is increasingly stringenter, increasingly higher demands also proposed to engine technology, especially
It is to cope with six emission regulation of state, six engine of state newly developed has all used EGR Technology (EGR).EGR rate
The performance and discharge of engine are directly affected, therefore, the control of EGR rate just becomes key, and the accuracy of EGR rate control
It is again closely related with the accuracy of EGR flow measurement.Venturi tube is exactly a kind of device of common measuring flow, it passes through survey
Static pressure out at two measuring points is poor, can find out flow with continuity equation and Bernoulli's theorem.It is more and more tighter in emission regulation
It is that can accurately measure the flow of EGR and not make to the Venturi tube requirement in engine EGR pipeline under the premise of lattice
It at the blocking of pressure tappings, and cannot too greatly increase the overall resistance of EGR line, influence the introducing of exhaust gas, EGR rate is not achieved
The requirement of design.It is specifically presented as, be designed preferable Venturi tube, the pressure difference of two pressure tappings is meeting differential pressure pickup
Under measurement range requires, the total pressure head of pipeline is smaller.
It is applied in the measurement of engine EGR flow according to existing flow measurement pipeline, usually uses classical literary mound
In pipe measuring flow, access one section of isodiametric pipeline later and exhaust gas is introduced into air inlet pipeline is mixed with fresh air.Through
Allusion quotation Venturi tube is as shown in Figure 1, structure all consists of the following parts substantially: 11: one short cylindrical sections of entrance, a diameter of
D；Contraction section 12: shape is a conical pipe, and cone angle is about 21 ° ± 1 °；13: one short straight pipes of venturi, diameter d is about 1/3
~1/4D, length are equal to d ± 0.03d；Diffuser 14: the Taper Pipe that cone angle φ is 7 °~15 °, diffuser outlet diameter are generally equal to
Entrance diameter.
Selection for pressure tappings diameter, if classical venturi tube recommends throat diameter d to be more than or equal to 33.3mm,
Pressure tappings diameter should be between 4mm~10mm, and the diameter of upstream pressure tappings never should be greater than 0.1D, and the diameter of throat's pressure tappings is exhausted
0.13d cannot be greater than.If d is less than 33.3mm, the diameter of throat's pressure tappings should be between 0.1d~0.13d, upstream pressure tappings
Diameter should be between 0.1d~0.1D.
Existing flow measurement pipeline is applied to be had the following problems: in the measurement of engine exhaust flow
1, venturi throat length is slightly shorter, and pressure tappings position air-flow is unstable to be easy to cause measurement unstable；
2, Venturi tube diffusion segment length is longer, occupies more space；
3, engine exhaust impurity is more, designs pressure tappings diameter according to classical venturi tube design requirement, then pressure tappings
Diameter is smaller, and when measuring engine exhaust flow, carbon distribution easy to form causes pressure tappings to block；
It 4, is that one section of isodiametric round pipe road of access is introduced into exhaust gas in air inlet pipeline after Venturi tube, then entirely
Pipeline only has the level-one diffusion of Venturi tube diffuser, and the pressure loss is larger.
The information disclosed in the background technology section is intended only to increase the understanding to general background of the invention, without answering
When being considered as recognizing or imply that the information constitutes the prior art already known to those of ordinary skill in the art in any form.
Summary of the invention
The purpose of the present invention is to provide a kind of measurement pipelines of simple and reasonable engine EGR exhaust gas flow, should
Engine EGR exhaust gas flow measurement pipeline Venturi tube pressure tappings diameter it is big compared with classical venturi tube, measurement impurity compared with
Stopping state caused by being less prone to due to carbon distribution when more engine exhausts.The throat length of Venturi tube is pressure tappings
At least four times of diameter, this ensure that the stabilization of pressure tappings position air-flow, and then ensure that the stabilization of measurement.Meanwhile literary mound
In pipe diffuser outlet diameter it is small compared with entrance diameter, i.e., be truncated one section in the diffuser of Venturi tube, both shortened length,
The occupied space of Venturi tube is reduced, and reduces flow separation phenomenon in diffuser.In addition, being used after Venturi tube
Be that the pipeline that one section of actual internal area is gradually increased to be connected with engine charge pipeline, the flaring pipeline be equivalent to second level expansion
The effect of pressure can reduce the pressure drop of entire measurement pipeline.
To achieve the above object, the present invention provides a kind of measurement pipelines of engine EGR exhaust gas flow, comprising: literary mound
In manage comprising: entrance, contraction section, throat and diffuser offer the first pressure tappings, the throat on the entrance
On offer the second pressure tappings；The diameter of first pressure tappings and the second pressure tappings is identical, and the contraction section is cone, cone
Angle is 50~60 °, and the length of the throat is at least four times of the second pressure tappings diameter, and the diameter of the throat is entrance
0.4~0.6 times of diameter；The diffuser is cone, and cone angle is being 7~8 °, and outlet diameter is less than the entrance
Diameter；Sebific duct；And diffuser, one end are connect by the sebific duct with the diffuser of the Venturi tube, the other end and hair
The connection of motivation air inlet pipe.
Preferably, in above-mentioned technical proposal, the diameter of the first pressure tappings and the second pressure tappings is 3.5~5mm.
Preferably, in above-mentioned technical proposal, the second pressure tappings are arranged in the middle position of the throat.
Preferably, in above-mentioned technical proposal, it is identical as entrance diameter that the length of diffuser for it extends to outlet diameter
When length 1/2~2/3.
Preferably, in above-mentioned technical proposal, use round-corner transition between entrance and throat, the throat and diffuser it
Between use round-corner transition.
Compared with prior art, the invention has the following beneficial effects: the measurement pipelines of the engine EGR exhaust gas flow
The pressure tappings diameter of Venturi tube is big compared with classical venturi tube, and when measurement impurity more engine exhaust is less prone to due to product
Stopping state caused by carbon reason.The throat length of Venturi tube is at least four times of pressure tappings diameter, this ensure that pressure
The stabilization of mouth position air-flow, and then ensure that the stabilization of measurement.Meanwhile Venturi tube diffuser outlet diameter is compared with entrance diameter
It is small, i.e., it is truncated one section in the diffuser of Venturi tube, has both shortened length, has reduced the occupied space of Venturi tube, again
Reduce flow separation phenomenon in diffuser.In addition, using one section of actual internal area to be gradually increased after Venturi tube
Pipeline to be connected with engine charge pipeline, which is equivalent to the effect of second level diffusion, can reduce entire measurement pipe
The pressure drop on road.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the measurement pipeline of available engine EGR exhaust flow.
Fig. 2 is the structural schematic diagram of the measurement pipeline of engine EGR exhaust gas flow of the invention.
Fig. 3 is the schematic cross-sectional view of the measurement pipeline of engine EGR exhaust gas flow of the invention.
Specific embodiment
With reference to the accompanying drawing, specific embodiments of the present invention will be described in detail, it is to be understood that guarantor of the invention
Shield range is not limited by the specific implementation.
Unless otherwise explicitly stated, otherwise in entire disclosure and claims, term " includes " or its change
Changing such as "comprising" or " including " etc. will be understood to comprise stated element or component, and not exclude other members
Part or other component parts.
As shown in Fig. 2, according to the present invention the engine EGR exhaust gas flow of specific embodiment measurement pipeline specific packet
It includes: Venturi tube 7, diffuser 9 and the sebific duct 8 for connecting the Venturi tube 7 and diffuser 9.Wherein, Venturi tube 7 is used to survey
Measure engine EGR flow.Diffuser 9 is used to connect Venturi tube and engine air inlet tube, passes through sebific duct 8 and Venturi tube 7
Connection, diffuser 9 is the pipeline that an actual internal area gradually increases, and the flaring tube outlet shape can according to air inlet pipe
The shape of road connector and become, can be round, rectangle or other shapes, it is both to play second level diffusion, reduces entire pipe
The effect of road pressure drop, and play the role of being transitioned into other outlet shapes by the circular shape that Venturi tube diffuser exports.
Specifically, as shown in figure 3, Venturi tube 7 includes: entrance 1, contraction section 3, throat 4 and diffuser 6, wherein
The first pressure tappings 2 (upstream pressure tappings) are offered on entrance 1, and the second pressure tappings 5 (downstream pressure tappings) are offered in throat 4.
First pressure tappings 2 are identical with the diameter of the second pressure tappings 5, are 3.5~5mm, which is not that too small to be easy to make carbon distribution stifled
Plug, is also not excessive influence air motion, causes air-flow unstable.
Contraction section 3 is cone, and cone angle is at 50~60 ° or so.Second pressure tappings 5 are arranged in the middle position of throat 4, larynx
The length in portion 4 is at least four times of the second pressure tappings diameter, this ensure that the stabilization of pressure tappings position air-flow, and then ensure that
The stabilization of measurement.The given situation of the diameter of throat 4 maximum EGR flow and the measurement range of differential pressure pickup needed for engine
Under, it is estimated according to continuity equation and Bernoulli equation, the diameter of throat 4 is about the 0.4~0.6 of the diameter of entrance 1
Times.Diffuser 6 is also cone, and cone angle is at 7~8 ° or so, and outlet diameter is less than the diameter of entrance 1, separates position in air-flow
Setting can be truncated, the diffusion segment length that can be truncated for its extend to outlet diameter it is identical as entrance diameter when length 1/3
~1/2 or so, that is, the length for being 1/2~2/3 is remained, be conducive to weaken flow separation phenomenon.Entrance and larynx
The round-corner transition of R5, the round-corner transition of throat and diffuser R10 are used between portion.
One end of diffuser 9 is connect by sebific duct 8 with the diffuser 6 of Venturi tube 7, and the other end and engine air inlet tube connect
Connect, diffuser 9 is the pipeline that an actual internal area gradually increases, and the flaring tube outlet shape can according to air inlet pipeline
The shape of connector and become, can be round, rectangle or other shapes, it is both to play second level diffusion, reduces entire pipeline
The effect of pressure drop, and play the role of being transitioned into other outlet shapes by the circular shape that Venturi tube diffuser exports.
To sum up, the more classical venturi of pressure tappings diameter of the Venturi tube of the measurement pipeline of the engine EGR exhaust gas flow
Guan great, stopping state caused by when measurement impurity more engine exhaust is less prone to due to carbon distribution.Venturi tube
Throat length is at least four times of pressure tappings diameter, this ensure that the stabilization of pressure tappings position air-flow, and then ensure that measurement
Stabilization.Meanwhile Venturi tube diffuser outlet diameter is small compared with entrance diameter, i.e., has been truncated one in the diffuser of Venturi tube
Section, both shortens length, reduces the occupied space of Venturi tube, and reduce flow separation phenomenon in diffuser.In addition,
The pipeline for using one section of actual internal area to be gradually increased after Venturi tube to be connected with engine charge pipeline, the flaring
Pipeline is equivalent to the effect of second level diffusion, can reduce the pressure drop of entire measurement pipeline.
The aforementioned description to specific exemplary embodiment of the invention is in order to illustrate and illustration purpose.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to the above instruction, can much be changed
And variation.The purpose of selecting and describing the exemplary embodiment is that explaining specific principle of the invention and its actually answering
With so that those skilled in the art can be realized and utilize a variety of different exemplary implementation schemes of the invention and
Various chooses and changes.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (3)
1. a kind of measurement pipeline of engine EGR exhaust gas flow characterized by comprising
Venturi tube comprising: entrance, contraction section, throat and diffuser offer the first pressure tappings on the entrance,
The second pressure tappings are offered in the throat；The diameter of first pressure tappings and the second pressure tappings is identical, and the contraction section is
Cone, cone angle are 50~60 °, and the length of the throat is at least four times of the second pressure tappings diameter, the diameter of the throat
It is 0.4~0.6 times of the diameter of entrance；The diffuser is cone, and cone angle is 7~8 °, and outlet diameter is less than described
The diameter of entrance；The diameter of first pressure tappings and the second pressure tappings is 3.5~5mm；
Sebific duct；And
Diffuser, one end are connect by the sebific duct with the diffuser of the Venturi tube, the other end and engine air inlet tube
Connection.
2. the measurement pipeline of engine EGR exhaust gas flow according to claim 1, which is characterized in that second pressure
Mouth is arranged in the middle position of the throat.
3. the measurement pipeline of engine EGR exhaust gas flow according to claim 1, which is characterized in that the diffuser
Length for its extend to outlet diameter it is identical as entrance diameter when length 1/2~2/3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611264459.8A CN106762244B (en) | 2016-12-30 | 2016-12-30 | The measurement pipeline of engine EGR exhaust gas flow |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611264459.8A CN106762244B (en) | 2016-12-30 | 2016-12-30 | The measurement pipeline of engine EGR exhaust gas flow |
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| CN106762244A CN106762244A (en) | 2017-05-31 |
| CN106762244B true CN106762244B (en) | 2019-02-01 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106704047B (en) * | 2017-01-23 | 2018-08-10 | 广西玉柴机器股份有限公司 | EGR Venturi tubes |
| CN112664362A (en) * | 2020-12-11 | 2021-04-16 | 广西玉柴机器股份有限公司 | Venturi tube structural parameter beneficial to accurate measurement of engine exhaust gas flow |
| CN114409152B (en) * | 2022-01-24 | 2023-10-10 | 北京首敬科技有限公司 | New pollutant removing device |
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| US7299707B1 (en) * | 2006-07-17 | 2007-11-27 | Dieterich Standard, Inc. | Eccentric venturi flow meter |
| DE102008047504A1 (en) * | 2007-09-27 | 2009-04-02 | Daimler Ag | Device for measuring an exhaust gas recirculation flow of an internal combustion engine |
| CA2823861A1 (en) * | 2011-02-24 | 2012-08-30 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Proced Es Georges Claude | Apparatus for tracking compliance with a treatment for obstructive sleep apnea |
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| CN106762244A (en) | 2017-05-31 |
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