CN210948939U - Venturi tube integrated with EGR valve seat - Google Patents
Venturi tube integrated with EGR valve seat Download PDFInfo
- Publication number
- CN210948939U CN210948939U CN201921226927.1U CN201921226927U CN210948939U CN 210948939 U CN210948939 U CN 210948939U CN 201921226927 U CN201921226927 U CN 201921226927U CN 210948939 U CN210948939 U CN 210948939U
- Authority
- CN
- China
- Prior art keywords
- egr valve
- valve seat
- straight section
- section
- venturi tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Exhaust-Gas Circulating Devices (AREA)
Abstract
The utility model relates to the technical field of engine exhaust gas recirculation, in particular to a Venturi tube integrated with an EGR valve seat, which comprises an inlet straight section, a contraction section, a cylinder throat part and a diffusion section which are sequentially connected along the airflow direction; the inlet straight section is communicated with a first pressure taking channel, the cylinder throat part is communicated with a second pressure taking channel, the inlet straight section is provided with an EGR valve seat in an integrated mode, and the tail of the inlet straight section on one side far away from the contraction section is set to be a sealing end. The utility model discloses a EGR valve and venturi's arrangement under finite space, compact structure has reduced special-purpose part quantity, reduces total part cost and assembly cost.
Description
Technical Field
The utility model relates to an engine exhaust gas recirculation technical field, especially a venturi of integrated EGR disk seat.
Background
With the stricter and stricter emission regulations of diesel engines, the EGR becomes an important technical route for reducing the emission of the diesel engines, and the accuracy of EGR flow measurement directly determines the accuracy of EGR rate control in a closed control system. The EGR flow measuring device commonly used at present is a Venturi tube, the EGR Venturi tube flowmeter is used for calculating the volume flow of the waste gas by measuring the pressure difference generated at the throat part and the straight section of an inlet when the waste gas flows through the Venturi tube, meanwhile, the mass flow of the waste gas is converted according to the temperature and the pressure of the waste gas, and the larger the flow is, the larger the pressure difference is. The EGR venturi tube consists of an inlet straight section, a contraction section, a cylinder throat, a diffusion section and a pressure taking port. And all need machine tooling from entry straight section to diffuser segment, improve surface roughness to guarantee the measurement accuracy of exhaust gas flow.
The EGR valve is a device which is arranged on the diesel engine through a valve seat and is used for controlling the exhaust gas recirculation amount fed back to an air inlet system, in the existing engine exhaust gas recirculation system, a Venturi tube and the EGR valve seat are separately designed, a rubber tube or a metal corrugated tube is used for connection in the middle, enough design space is required, the integration level is low, and the arrangement requirements of the Venturi tube and the EGR valve under the limited space cannot be met.
SUMMERY OF THE UTILITY MODEL
The utility model provides a venturi of integrated EGR disk seat has realized EGR valve and venturi's arrangement under finite space, and compact structure has reduced special-purpose part quantity, reduces total part cost and assembly cost.
The technical scheme of the utility model as follows:
a Venturi tube integrated with an EGR valve seat comprises an inlet straight section, a contraction section, a cylinder throat part and a diffusion section which are sequentially connected along the airflow direction; a first pressure measuring channel is communicated with the straight section of the inlet, a second pressure measuring channel is communicated with the throat part of the cylinder, and the first pressure measuring channel and the second pressure measuring channel are connected with a pressure detection device, such as a differential pressure sensor; the integrated into one piece is provided with the EGR disk seat on the straight section of entry, the EGR disk seat is used for installing the EGR valve, the disk seat inner chamber of EGR disk seat with the internal channel intercommunication of the straight section of entry, the EGR valve is crossed from the EGR pipeline to the air current, and the EGR valve passes through control flap aperture control air current size, then the air current enters into the straight section of entry, the straight section of entry is keeping away from the end of one side of shrink section sets up to sealed end, be the machining process hole after sealed end is opened.
The utility model designs the EGR valve seat and the Venturi tube in an integrated mode, so the EGR valve can be directly arranged at the inlet of the Venturi tube, the assembly process of the EGR valve seat is simplified, the structure is compact, the number of special parts is reduced, the total part cost is reduced, and the problem of arrangement of the EGR valve and the Venturi tube in a limited space is solved;
the tail of one side of the inlet straight section close to the EGR valve seat is additionally provided with a machining process hole for machining an inner pipeline of the Venturi tube, and the inner runner of the inlet straight section is sealed by a sealing structure after being machined, so that the roughness of the surface of the inner runner of the inlet straight section is guaranteed, the measurement precision of the exhaust gas flow is improved, and the sealing of the Venturi tube is also guaranteed.
Preferably, the sealing end is constructed by matching a bowl-shaped plug with the inner wall of the straight inlet section, the bowl-shaped plug is pressed at the tail end of the straight inlet section to realize sealing, common accessories of the engine are adopted for blocking, the structure is simple, and the cost is low.
Preferably, the EGR valve seat is provided with more than 2 mounting through holes to form a flange structure, the mounting through holes are used for connecting the EGR valve to the EGR valve seat through bolts, the disassembly is convenient, the mounting pretightening force is convenient to adjust, and the cost is low.
Preferably, the included angle between the axis of the first pressure taking channel and the vertical direction is 10-30 degrees, and the axis of the second pressure taking channel is vertically arranged. By setting a proper angle, the measurement precision of the pressure difference is improved.
Preferably, the pressure measuring device further comprises mounting flanges arranged on the edges of the outlet of the first pressure measuring channel and the outlet of the second pressure measuring channel, and the mounting flanges are used for mounting a pressure monitoring device, such as a differential pressure sensor, so that mounting pretightening force can be conveniently adjusted, the structure is simple, and the cost is low.
The utility model has the advantages that:
1. the structure is compact, the integration level is high, the number of special parts is reduced, the total part cost is reduced, and the arrangement problem of the EGR valve and the Venturi tube in a limited space is solved.
2. The tail of one side, close to the EGR valve seat, of the inlet straight section is additionally provided with a machining process hole, the inner runner of the inlet straight section is sealed by a sealing structure after being processed, and the roughness of the surface of the inner runner of the inlet straight section is guaranteed, so that the measurement precision of the exhaust gas flow is improved, and the sealing of a Venturi tube is also guaranteed.
Drawings
Fig. 1 is a schematic diagram of the external structure of a venturi tube integrated with an EGR valve seat according to the present invention.
Fig. 2 is a sectional structure diagram of a venturi tube integrated with an EGR valve seat according to the present invention.
In the figure: 1-inlet straight section, 2-contraction section, 3-cylinder throat, 5-first pressure taking channel, 6-second pressure taking channel, 7-EGR valve seat, 701-valve seat inner cavity, 702-installation through hole, 8-bowl-shaped plug, 9-sealing end and 10-installation flange.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1:
as shown in fig. 1 and 2, a venturi tube integrated with an EGR valve seat comprises an inlet straight section 1, a contraction section 2, a cylindrical throat 3 and a diffusion section 4 connected in sequence along the direction of air flow; the inlet straight section 1 is communicated with a first pressure taking channel 5, the cylinder throat part 3 is communicated with a second pressure taking channel 6, the inlet straight section 1 is integrally provided with an EGR valve seat 7, a valve seat inner cavity 701 of the EGR valve seat 7 is communicated with an internal channel of the inlet straight section 1, and the tail of one side, far away from the contraction section 2, of the inlet straight section 1 is provided with a sealing end 9.
In this embodiment, the first pressure taking channel 5 and the second pressure taking channel 6 are connected to a pressure detecting device, such as a differential pressure sensor, the first pressure taking channel 5 is communicated with a high pressure end, and the second pressure taking channel 6 is communicated with a low pressure end; the integrated into one piece is provided with EGR disk seat 7 on the straight section 1 of entry, EGR disk seat 7 is used for installing the EGR valve, and the EGR valve is crossed from the EGR pipeline to the air current, and the EGR valve passes through control flap aperture control air current size, and then the air current enters into the straight section 1 of entry enters into venturi and carries out the flow measurement.
The initial section of the inlet straight section 1, namely the pipe section before the EGR valve seat 7, is additionally provided with a machining process hole for machining the inner pipeline of the Venturi tube, and the inner runner of the inlet straight section 1 is sealed by a sealing structure after being machined, so that the roughness of the surface of the inner runner of the inlet straight section 1 is ensured.
Example 2:
as shown in fig. 1 and 2, a venturi tube integrated with an EGR valve seat comprises an inlet straight section 1, a contraction section 2, a cylindrical throat 3 and a diffusion section 4 connected in sequence along the direction of air flow; a first pressure-taking channel 5 is communicated with the inlet straight section 1, a second pressure-taking channel 6 is communicated with the cylinder throat part 3, and the first pressure-taking channel 5 and the second pressure-taking channel 6 are connected with a pressure detection device, such as a differential pressure sensor; an EGR valve seat 7 is integrally formed on the inlet straight section 1, the EGR valve seat 7 is used for installing an EGR valve, a valve seat inner cavity 701 of the EGR valve seat 7 is communicated with an internal channel of the inlet straight section 1,
fig. 2 shows the flowing direction of the gas by arrows, the gas flow passes through an EGR valve from an EGR pipeline, the EGR valve controls the magnitude of the gas flow by controlling the opening degree of the valve, and then the gas flow enters the inlet straight section 1, and the end of one side of the inlet straight section 1 far away from the contraction section 2 is provided with a sealing end 9.
The sealing end 9 is constructed in a way that a bowl-shaped plug 8 is matched with the inner wall of the inlet straight section 1, and the bowl-shaped plug 8 is pressed at the tail end of the inlet straight section 1 to realize sealing;
the EGR valve seat 7 is provided with 2 mounting through holes 702 to form a flange structure, and the mounting through holes 702 are used for connecting the EGR valve to the EGR valve seat 7 through bolts.
The included angle between the axis of the first pressure taking channel 5 and the vertical direction is 10 degrees, and the axis of the second pressure taking channel 6 is vertically arranged;
the pressure measuring device further comprises a mounting flange 10 arranged on the edge of the outlet of the first pressure measuring channel 5 and the outlet of the second pressure measuring channel 6, and the mounting flange 10 is used for mounting a pressure monitoring device such as a differential pressure sensor.
Example 3:
this embodiment differs from embodiment 2 described above only in that: the included angle between the axis of the first pressure taking channel 5 and the vertical direction is 30 degrees, 3 installation through holes 702 are formed in the EGR valve seat 7, and the sealing end 9 is a plug sealing structure.
Claims (5)
1. A Venturi tube integrated with an EGR valve seat comprises an inlet straight section (1), a contraction section (2), a cylinder throat part (3) and a diffusion section (4) which are sequentially connected along the airflow direction; the inlet straight section (1) is communicated with a first pressure taking channel (5), the cylinder throat part (3) is communicated with a second pressure taking channel (6), and the pressure taking device is characterized in that: the integrated into one piece is provided with EGR disk seat (7) on entry straight section (1), the disk seat inner chamber (701) of EGR disk seat (7) with the inner passage intercommunication of entry straight section (1), entry straight section (1) is keeping away from the end of one side of shrink section (2) sets up to sealed end (9).
2. The venturi integrated EGR valve seat according to claim 1, wherein: the sealing end (9) is configured as a bowl-shaped plug (8) to cooperate with the inner wall of the inlet straight section (1).
3. A venturi tube integrated with an EGR valve seat according to claim 1 or 2, wherein: the EGR valve seat (7) is provided with more than 2 mounting through holes (702).
4. A venturi tube integrated with an EGR valve seat according to claim 1 or 2, wherein: the included angle between the axis of the first pressure taking channel (5) and the vertical direction is 10-30 degrees, and the axis of the second pressure taking channel (6) is vertically arranged.
5. A venturi tube integrated with an EGR valve seat according to claim 1 or 2, wherein: the pressure measuring device also comprises a mounting flange (10) arranged on the edge of the outlet of the first pressure measuring channel (5) and the outlet of the second pressure measuring channel (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921226927.1U CN210948939U (en) | 2019-07-31 | 2019-07-31 | Venturi tube integrated with EGR valve seat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921226927.1U CN210948939U (en) | 2019-07-31 | 2019-07-31 | Venturi tube integrated with EGR valve seat |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210948939U true CN210948939U (en) | 2020-07-07 |
Family
ID=71371541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921226927.1U Active CN210948939U (en) | 2019-07-31 | 2019-07-31 | Venturi tube integrated with EGR valve seat |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210948939U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111997804A (en) * | 2020-08-21 | 2020-11-27 | 东风汽车股份有限公司 | Venturi tube mounting structure |
-
2019
- 2019-07-31 CN CN201921226927.1U patent/CN210948939U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111997804A (en) * | 2020-08-21 | 2020-11-27 | 东风汽车股份有限公司 | Venturi tube mounting structure |
| CN111997804B (en) * | 2020-08-21 | 2021-04-23 | 东风汽车股份有限公司 | Venturi tube mounting structure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6810725B2 (en) | Exhaust gas recirculation measurement device | |
| KR100495362B1 (en) | Heating resistance air flow measuring device and fuel control system of internal combustion engine using the same | |
| CN101922388B (en) | Intake system for internal combustion engine | |
| US7140344B2 (en) | Air cleaner | |
| CN110630409B (en) | Gas mixing device and natural gas engine | |
| CN106482794B (en) | Venturi flowmeter of EGR engine | |
| CN210948939U (en) | Venturi tube integrated with EGR valve seat | |
| US20090241683A1 (en) | Mass air flow sensor adaptor | |
| US5988149A (en) | Pressure sensing system for an internal combustion engine | |
| US20050235940A1 (en) | Intake system for internal combustion engine and method of controlling internal combustion engine | |
| CN210948938U (en) | Venturi tube flowmeter of EGR (exhaust gas recirculation) engine | |
| US20180252189A9 (en) | Air inlet system | |
| CN205593570U (en) | Air flow meter | |
| US20210156345A1 (en) | Gas mixing device and a natural gas engine | |
| CN114965895A (en) | Integrated gas concentration detection device | |
| CN110296843B (en) | Differential pressure simulation device and connection structure | |
| US4986116A (en) | Air flow meter for internal combustion engine | |
| CN217538881U (en) | Integrated supercharger air inlet connecting pipe structure | |
| CN217272243U (en) | Electromagnetic valve with differential pressure sensor | |
| CN215599112U (en) | Device capable of directionally guiding exhaust airflow | |
| CN112761775B (en) | Anti-surge gas engine pressurization system | |
| CN217276426U (en) | Standard flowmeter | |
| CN211174399U (en) | Two segmentation venturi of integrated EGR disk seats | |
| CN216142837U (en) | Air intake manifold assembly | |
| CN216894654U (en) | Air inlet structure of explosion-proof diesel engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |