CN206299482U - 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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- CN206299482U CN206299482U CN201621483236.6U CN201621483236U CN206299482U CN 206299482 U CN206299482 U CN 206299482U CN 201621483236 U CN201621483236 U CN 201621483236U CN 206299482 U CN206299482 U CN 206299482U
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- pressure tappings
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Abstract
The utility model discloses a kind of measurement pipeline of engine EGR exhaust gas flow.The measurement pipeline includes：Venturi tube, it includes：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, 0.4~0.6 times of the diameter of a diameter of entrance of the throat；The diffuser is cone, and outlet diameter is less than the diameter of the entrance；Sebific duct；And increaser, its one end is connected by the sebific duct with the diffuser of the Venturi tube, and the other end is connected with engine air inlet tube.The pipeline for using one section of actual internal area gradually to increase after the Venturi tube of the measurement pipeline to be connected with engine charge pipeline, can reduce the pressure drop of whole measurement pipeline.
Description
Technical field
The utility model is related to the fields of measurement of engine EGR exhaust gas flow, more particularly to a kind of engine EGR waste gas stream
The measurement pipeline of amount.
Background technology
As engine emission regulation is more and more stricter, higher and higher requirement is it is also proposed to engine technology, especially
It is that, in order to tackle the Abgasgesetz of state six, the engine of state six newly developed has all used EGR Technology (EGR).EGR rate
Performance and the 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 conventional measurement flow, and it is by surveying
The static pressure gone out at two measuring points is poor, and flow can be obtained with continuity equation and Bernoulli's theorem.It is more and more tighter in Abgasgesetz
It is that can accurately measure the flow of EGR and not make to the Venturi tube requirement in engine EGR pipeline on the premise of lattice
Into the blocking of pressure tappings, the overall resistance of EGR line can not be too greatly increased again, influence the introducing of waste gas, not reach EGR rate
The requirement of design.Specifically it is presented as, be designed to preferable Venturi tube, the pressure difference of two pressure tappings is meeting differential pressure pickup
Under measurement range requirement, the total pressure head of pipeline is smaller.
It is applied in the measurement of engine EGR flow according to existing flow measurement pipeline, typically uses classical text mound
In pipe measurement flow, one section of isodiametric pipeline is accessed afterwards and waste gas is incorporated into air inlet pipeline is mixed with fresh air.Through
Allusion quotation Venturi tube is as shown in figure 1, structure is all made up of following part substantially：Entrance 11：One short cylindrical section, its is a diameter of
D；Contraction section 12：A conical pipe is shaped as, cone angle is about 21 ° ± 1 °；Venturi 13：One short straight length, diameter d is about 1/3
~1/4D, length is equal to d ± 0.03d；Diffuser 14：Cone angle φ is 7 °~15 ° of Taper Pipe, and diffuser outlet diameter is generally equal to
Entrance diameter.
For the selection of 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 can not be more 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 has following point in the measurement of engine exhaust flow：
1st, venturi throat length is slightly shorter, and air-flow unstable easily causing in pressure tappings position measures unstable；
2nd, Venturi tube diffusion segment length is more long, occupies more space；
3rd, engine exhaust impurity is more, designs pressure tappings diameter according to classical venturi tube design requirement, then pressure tappings
Diameter is smaller, carbon distribution is easily formed when engine exhaust flow is measured and causes pressure tappings to block；
4th, it is to access one section of isodiametric circular pipeline to be incorporated into air inlet pipeline waste gas after Venturi tube, then entirely
Pipeline only has the one-level diffusion of Venturi tube diffuser, and the pressure loss is larger.
The information for being disclosed in the background section is merely intended to increase the understanding to general background of the present utility model, and
It is not construed as recognizing or implying in any form that the information structure has been existing well known to persons skilled in the art
Technology.
Utility model content
The purpose of this utility model is to provide a kind of measurement pipe of simple and reasonable engine EGR exhaust gas flow
Road, the pressure tappings diameter of the Venturi tube of the measurement pipeline of the engine EGR exhaust gas flow is big compared with classical venturi tube, measures miscellaneous
It is less prone to due to the stopping state that carbon distribution reason is caused during the more engine exhaust of matter.The throat length of Venturi tube is to take
At least four times of pressure mouth diameter, this ensure that the stabilization of pressure tappings position air-flow, and then ensure that the stabilization of measurement.Meanwhile,
Venturi tube diffuser outlet diameter is small compared with entrance diameter, i.e., the diffuser in Venturi tube has blocked one section, both shortens
Length, reduces the space shared by Venturi tube, and flow separation phenomenon in diffuser is reduced again.Additionally, Venturi tube it
The pipeline for using one section of actual internal area gradually to increase afterwards to be connected with engine charge pipeline, the flaring pipeline equivalent to
Two grades of effects of diffusion, can reduce the pressure drop of whole measurement pipeline.
To achieve the above object, the utility model provides a kind of measurement pipeline of engine EGR exhaust gas flow, including：
Venturi tube, it includes：Entrance, contraction section, throat and diffuser, offer the first pressure tappings on the entrance, described
The second pressure tappings are offered in throat；The diameter of first pressure tappings and the second pressure tappings is identical, and the contraction section is circular cone
Shape, cone angle be 50~60 °, the length of the throat is at least four times of the second pressure tappings diameter, the throat it is a diameter of enter
0.4~0.6 times of the diameter of mouth section；The diffuser is cone, and cone angle is be 7~8 °, and outlet diameter enters less than described in
The diameter of mouth section；Sebific duct；And increaser, its one end is connected by the sebific duct with the diffuser of the Venturi tube, another
End is connected with engine air inlet tube.
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 centre position of the throat.
Preferably, in above-mentioned technical proposal, to extend to outlet diameter identical with entrance diameter for it for the length of diffuser
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 utility model has the advantages that：The measurement pipe of the engine EGR exhaust gas flow
The pressure tappings diameter of the Venturi tube on road is big compared with classical venturi tube, be less prone to during the more engine exhaust of measurement impurity by
In the stopping state that carbon distribution reason is caused.The throat length of Venturi tube is at least four times of pressure tappings diameter, this ensure that
The stabilization of pressure tappings position air-flow, and then ensure that the stabilization of measurement.Meanwhile, Venturi tube diffuser outlet diameter is compared with entrance
Diameter is small, i.e., the diffuser in Venturi tube has blocked one section, both shortens length, reduces the sky shared by Venturi tube
Between, flow separation phenomenon in diffuser is reduced again.Additionally, using one section of actual internal area gradually to increase after Venturi tube
Big pipeline to be connected with engine charge pipeline, and the flaring pipeline can reduce whole survey equivalent to two grades of effects of diffusion
The pressure drop on buret road.
Brief description of the drawings
Fig. 1 is the structural representation of the measurement pipeline of available engine EGR exhaust flow.
Fig. 2 is the structural representation of the measurement pipeline of engine EGR exhaust gas flow of the present utility model.
Fig. 3 is the cross section structure diagram of the measurement pipeline of engine EGR exhaust gas flow of the present utility model.
Specific embodiment
Below in conjunction with the accompanying drawings, specific embodiment of the present utility model is described in detail, it is to be understood that this practicality
New protection domain is not limited by specific embodiment.
Explicitly indicated that unless otherwise other, otherwise in entire disclosure and claims, term " including " or its change
Change such as "comprising" or " including " etc. and will be understood to comprise stated element or part, and do not exclude other units
Part or other parts.
As shown in Fig. 2 the tool for measuring pipeline of the engine EGR exhaust gas flow according to the utility model specific embodiment
Body includes：Venturi tube 7, increaser 9 and connect the sebific duct 8 of the Venturi tube 7 and increaser 9.Wherein, Venturi tube 7 is used
To measure engine EGR flow.Increaser 9 is used for connecting Venturi tube and engine air inlet tube, and it passes through sebific duct 8 and venturi
Pipe 7 is connected, and increaser 9 is an actual internal area gradually increased pipeline, and the flaring tube outlet shape can according to enter
The shape of air pipe connector and become, can be circular, rectangle or other shapes, it is both to play two grades of diffusions, is reduced whole
The effect of individual pressure-drop in pipeline, plays the round-shaped work for being transitioned into other outlet shapes exported by Venturi tube diffuser again
With.
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, 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, and the diameter is not too small carbon distribution of easily making and blocks up
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 centre 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 situation that the diameter of throat 4 measurement range of maximum EGR flow and differential pressure pickup needed for engine gives
Under, to be 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 separates position less than the diameter of entrance 1 in air-flow
Blocked by putting, the diffusion segment length that can be blocked be its extend to outlet diameter it is identical with entrance diameter when length 1/3
~1/2 or so, that is, remain for 1/2~2/3 length, be conducive to weaken flow separation phenomenon.Entrance and larynx
With the round-corner transition of R5 between portion, throat and the diffuser round-corner transition of R10.
One end of increaser 9 is connected by sebific duct 8 with the diffuser 6 of Venturi tube 7, and the other end connects with engine air inlet tube
Connect, increaser 9 is an actual internal area gradually increased pipeline, and the flaring tube outlet shape can according to air inlet pipeline
The shape of connector and become, can be circular, rectangle or other shapes, it is both to play two grades of diffusions, reduces whole pipeline
The effect of pressure drop, plays a part of round-shaped to be transitioned into other outlet shapes by what Venturi tube diffuser was exported again.
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, is less prone to due to the stopping state that carbon distribution reason is caused during the measurement more engine exhaust of impurity.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., the diffuser in Venturi tube has blocked one
Section, both shortens length, reduces the space shared by Venturi tube, and flow separation phenomenon in diffuser is reduced again.Additionally,
The pipeline for using one section of actual internal area gradually to increase after Venturi tube to be connected with engine charge pipeline, the flaring
Pipeline can reduce the pressure drop of whole measurement pipeline equivalent to two grades of effects of diffusion.
The foregoing description to specific illustrative embodiment of the present utility model be in order to illustrate and illustration purpose.These
Description is not wishing to for the utility model to be defined to disclosed precise forms, and it will be apparent that according to above-mentioned teaching, can carry out
It is many to change and change.The purpose of selecting and describing the exemplary embodiment is that explaining certain principles of the present utility model
And its practical application, so that those skilled in the art can realize and utilize a variety of examples of the present utility model
Property embodiment and a variety of selections and change.Scope of the present utility model is intended to by claims and its waits similar shape
Formula is limited.
Claims (5)
1. a kind of measurement pipeline of engine EGR exhaust gas flow, it is characterised in that including：
Venturi tube, it includes：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 is 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 be 7~8 °, and outlet diameter is less than institute
State the diameter of entrance；
Sebific duct；And
Increaser, its one end is connected 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, it is characterised in that first pressure
The diameter of mouth and the second pressure tappings is 3.5~5mm.
3. the measurement pipeline of engine EGR exhaust gas flow according to claim 1, it is characterised in that second pressure
Mouth is arranged in the centre position of the throat.
4. the measurement pipeline of engine EGR exhaust gas flow according to claim 1, it is characterised in that the diffuser
Length be its extend to outlet diameter it is identical with entrance diameter when length 1/2~2/3.
5. the measurement pipeline of engine EGR exhaust gas flow according to claim 1, it is characterised in that the entrance with
Round-corner transition is used between throat, round-corner transition is used between the throat and diffuser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621483236.6U CN206299482U (en) | 2016-12-30 | 2016-12-30 | The measurement pipeline of engine EGR exhaust gas flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621483236.6U CN206299482U (en) | 2016-12-30 | 2016-12-30 | The measurement pipeline of engine EGR exhaust gas flow |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206299482U true CN206299482U (en) | 2017-07-04 |
Family
ID=59205849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621483236.6U Withdrawn - After Issue CN206299482U (en) | 2016-12-30 | 2016-12-30 | The measurement pipeline of engine EGR exhaust gas flow |
Country Status (1)
| Country | Link |
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| CN (1) | CN206299482U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762244A (en) * | 2016-12-30 | 2017-05-31 | 广西玉柴机器股份有限公司 | The measurement pipeline of engine EGR exhaust gas flow |
-
2016
- 2016-12-30 CN CN201621483236.6U patent/CN206299482U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762244A (en) * | 2016-12-30 | 2017-05-31 | 广西玉柴机器股份有限公司 | The measurement pipeline of engine EGR exhaust gas flow |
| CN106762244B (en) * | 2016-12-30 | 2019-02-01 | 广西玉柴机器股份有限公司 | The measurement pipeline of engine EGR exhaust gas flow |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170704 Effective date of abandoning: 20190201 |