CN108087160B - High temperature resistant EGR valve - Google Patents
High temperature resistant EGR valve Download PDFInfo
- Publication number
- CN108087160B CN108087160B CN201711324665.8A CN201711324665A CN108087160B CN 108087160 B CN108087160 B CN 108087160B CN 201711324665 A CN201711324665 A CN 201711324665A CN 108087160 B CN108087160 B CN 108087160B
- Authority
- CN
- China
- Prior art keywords
- valve
- heat insulation
- valve casing
- sealing
- valve rod
- 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.)
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Links
- 238000007789 sealing Methods 0.000 claims abstract description 65
- 238000009413 insulation Methods 0.000 claims description 54
- 239000002912 waste gas Substances 0.000 claims description 11
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 239000000498 cooling water Substances 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 15
- 230000006872 improvement Effects 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000002699 waste material Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/65—Constructional details of EGR valves
- F02M26/74—Protection from damage, e.g. shielding means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention discloses a high-temperature-resistant EGR valve, which comprises a valve casing (1) and a valve rod (2) arranged in the valve casing (1), wherein the valve rod (2) and the valve casing (1) are sealed through a sealing ring (3), a bushing (4) is further arranged between the sealing ring (3) and the valve casing (1), the bushing (4) comprises a fixing section (4.1) tightly matched with the valve casing (1) and a sealing section (4.2) in clearance fit with the valve casing (1), the sealing section (4.2) is provided with a sealing groove (4.3) for accommodating the sealing ring (3), and the sealing ring (3) is used for sealing a gap between the valve rod (2) and the bushing (4). The invention provides a high-temperature resistant EGR valve which does not need to be provided with a cooling water path and can insulate a sealing ring.
Description
Technical Field
The invention relates to the technical field of valves for gas circulation systems of engines, in particular to a high-temperature-resistant EGR valve.
Background
As is well known, exhaust gas recirculation, or "EGR", has become increasingly popular in the field of emission control of internal combustion engines, as an emission control measure that is low cost, has little modification to the engine itself, and is effective in reducing NOx. In the process of engine operation, part of exhaust gas is introduced into an air inlet pipe, mixed with fresh air or atomized mixed gas and then enters an engine cylinder for re-combustion. This method is an effective measure for reducing NOx and emission. An exhaust gas recirculation circuit for recirculating exhaust gas to an intake conduit is arranged between the intake conduit and an exhaust conduit, which is a known technique in internal combustion diesel engines. However, as environmental awareness increases, modern gasoline engines require more stringent emissions and better fuel economy; the use of EGR in gasoline engines may improve fuel economy and reduce carbon dioxide emissions, and may reduce NOx and PM emissions. An EGR valve is an actuator in an EGR system that functions to regulate the flow of recirculated exhaust gas. The EGR valve comprises a shell, a channel for the exhaust gas to pass through is arranged in the shell, a valve rod is arranged on the channel, a valve block is arranged on the valve rod, the valve rod is driven by a driving piece to axially move so as to seal the channel by the valve block to break the exhaust gas communication or open the channel to enable the exhaust gas to pass through,
the existing EGR valve sets up the sealing washer between valve rod and the valve casing to avoid waste gas to pass through from the clearance between valve rod and the valve casing, and conventional sealing washer's operating temperature can not exceed 200 ℃, so through setting up the business turn over water pipe on the valve casing, set up the water route that encircles the sealing washer setting in the valve casing, in order to cool down the valve casing near the sealing washer, avoid sealing washer seal to lose efficacy, but set up the water route and can increase the processing cost of valve casing, and set up into water pipe, water supply cooling plant and all can produce the interference to the peripheral part of EGR valve, tend to compact, efficient design theory with the engine and go against, and if do not set up the cooling water route, because exhaust gas temperature is higher, the heat of conduction to the sealing washer from the valve casing can make the temperature of sealing washer exceed 300 ℃ very fast, lead to sealing washer seal to lose efficacy.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: provided is a high-temperature resistant EGR valve which can insulate a seal ring without providing a cooling water path.
The invention solves the problems by adopting the following technical scheme: the utility model provides a high temperature resistant EGR valve, includes the valve casing, establishes the valve rod in the valve casing, it is sealed through the sealing washer between valve rod and the valve casing, still be equipped with the bush between sealing washer and the valve casing, the bush including be used for with the fixed section of valve casing close-fitting and with valve casing clearance fit's sealed section, sealed section is equipped with the seal groove that is used for the holding sealing washer, the sealing washer is used for sealing the clearance between valve rod and the bush.
Compared with the prior art, the invention has the advantages that: the bushing is arranged between the valve shell and the valve rod, the fixed section of the bushing is tightly matched with the valve shell, a gap is reserved between the sealing section and the valve shell, the sealing groove is arranged in the sealing section to accommodate the sealing ring, and a gap is reserved between the sealing ring and the valve shell, and the heat conducted by the valve shell can be reduced due to the fact that the heat conductivity coefficient of air is low, so that the temperature of the sealing ring is reduced; the fixed end is tightly matched with the valve shell, and the sealing section is sealed with the valve rod through the sealing ring, so that waste gas can be prevented from passing through a gap between the valve rod and the valve shell; the lining can also be made of materials with low heat transfer coefficient, such as stainless steel and ceramic materials, or a plating layer is adopted, so that heat conducted by the valve housing is further reduced.
As an improvement of the invention, a framework is arranged between the sealing ring and the valve rod, the framework is tightly matched with the valve rod, through the improvement, the framework is arranged between the sealing ring and the valve rod and is used for supporting the sealing ring, and as the valve rod can axially move relative to the bushing, the framework is more wear-resistant compared with the sealing ring, and the framework can be made of high-temperature resistant engineering plastics and can isolate heat conducted from the valve rod to the sealing ring.
According to the invention, the outer peripheral wall of the fixed section of the bushing is concavely provided with a plurality of annular heat insulation grooves which are arranged at intervals along the axial direction of the bushing, and the heat insulation grooves are arranged to reduce the contact area between the bushing and the valve housing by the improvement, so that the heat conducted to the bushing by the valve housing is reduced as much as possible; and the heat insulation groove is filled with air, namely, the valve shell and the lining are tightly matched through partial direct interference and partial clearance fit, and the heat conductivity coefficient of the air is lower, so that the heat conducted by the valve shell can be reduced.
As a further improvement of the invention, the valve casing is internally provided with an exhaust cavity, the sealing section is arranged far away from the exhaust cavity, a heat insulation sheet is arranged between the bushing and the exhaust cavity, the heat insulation sheet comprises a first heat insulation part arranged between the end face of the bushing and the valve casing, a connecting part sleeved on the valve rod and a second heat insulation part arranged on a first side wall attached to the exhaust cavity, the first side wall is a side wall corresponding to the position of the bushing, and by the improvement, the exhaust gas brings heat, so that the exhaust cavity is the position with the largest heat in the EGR valve, and the sealing section is arranged far away from the exhaust cavity, thereby reducing the heat transferred from the exhaust cavity to the bushing as much as possible; a heat insulation sheet is arranged between the waste air cavity and the lining, and the heat insulation sheet is used for isolating the waste air cavity from the lining, so that the heat transferred from the waste air cavity to the lining is reduced; the heat insulation sheet comprises a first heat insulation part, wherein the first heat insulation part is used for insulating the end face of the bushing and the valve shell, the second heat insulation part is used for insulating the cavity of the waste gas cavity and the side wall of the waste gas cavity corresponding to the sealing ring, and the connecting part is used for increasing the interval distance between the waste gas cavity and the bushing and reducing the heat conducted from the waste gas cavity to the bushing; the heat insulating sheet may be made of material with low heat conducting coefficient, such as stainless steel and ceramic material, or may be coated to reduce the heat transferred from the exhaust cavity.
As a further improvement of the invention, the second heat insulation part is provided with a plurality of bulges towards the first side wall, the second heat insulation part is propped against the first side wall through the bulges, and by the improvement, the second heat insulation part is propped against the first side wall of the exhaust gas cavity corresponding to the sealing ring through the bulges, and the bulges can reduce the contact area between the second heat insulation part and the valve shell, so that the heat transfer between the heat insulation sheet and the valve shell is reduced.
According to the invention, the first limiting rib is arranged on one side of the heat insulating sheet, the limiting groove for the first limiting rib to penetrate is formed on one side of the waste gas cavity, and the first limiting rib is matched with the limiting groove so that the heat insulating sheet is limited in the valve casing.
As a further improvement of the invention, the connecting part is in clearance fit with the valve housing, the connecting part is in clearance fit with the valve rod, and by the improvement, the connecting part is in clearance fit with the valve housing and the valve rod, so that heat transfer between the valve housing and the heat insulation sheet and between the valve rod and the heat insulation sheet is reduced.
According to the invention, the first concave is arranged at the position of the outer wall of the valve housing corresponding to the heat insulation sheet, and the bottom surface of the first concave is arranged corresponding to the connecting part of the heat insulation sheet; and the bottom surface of the first recess is arranged corresponding to the connecting part of the heat insulating sheet, so that heat accumulation near the connecting part is reduced, and heat dissipation is carried out on the connecting part, so that heat conducted from the exhaust gas cavity to the lining is reduced.
As a further improvement of the invention, the side wall of the exhaust gas cavity is provided with a second limit rib for limiting the axial displacement of the heat insulation sheet along the valve rod, and the second limit rib is used for limiting the axial displacement of the heat insulation sheet through the improvement.
According to the invention, the second recess is arranged at the position of the outer wall of the valve casing corresponding to the bushing, and the bottom surface of the second recess is arranged corresponding to the fixed section of the bushing; and the bottom surface of the second recess is arranged corresponding to the fixed section so as to radiate the fixed end in advance, thereby reducing the heat of the sealing section.
Drawings
FIG. 1 is a schematic cross-sectional view of the overall structure of the present invention.
Fig. 2 is an enlarged schematic view of the structure shown in fig. 1A.
Fig. 3 is a schematic perspective view of the exhaust chamber.
1-valve shell, 1.1-waste air cavity, 1.1.1-first side wall, 1.2-limit groove, 1.3-first recess, 1.4-second recess, 1.5-second limit rib, 2-valve rod, 3-sealing ring, 4-bush, 4.1-fixed section, 4.2-sealing section, 4.3-sealing groove, 4.4-heat insulation groove, 5-skeleton, 5.1-groove, 6-heat insulation sheet, 6.1-first heat insulation part, 6.2-connecting part, 6.3-second heat insulation part, 6.4-bulge and 6.5-first limit rib.
Detailed Description
Embodiments of the present invention are further described below with reference to the accompanying drawings.
As shown in figures 1 to 3 of the drawings,
the utility model provides a high temperature resistant EGR valve, includes valve casing 1, establishes valve rod 2 in valve casing 1, it is sealed through sealing washer 3 between valve rod 2 and the valve casing 1, still be equipped with bush 4 between sealing washer 3 and the valve casing 1, bush 4 including be used for with valve casing 1 close-fitting fixed section 4.1 and with valve casing 1 clearance fit's sealed section 4.2, sealed section 4.2 is equipped with the seal groove 4.3 that is used for holding sealing washer 3, sealing washer 3 is used for sealing the clearance between valve rod 2 and the bush 4.
A framework 5 is arranged between the sealing ring 3 and the valve rod 2, and the framework 5 is tightly matched with the valve rod 2.
The outer peripheral wall of the framework 5 is provided with a groove 5.1 for embedding the sealing ring 3, and the groove is used for limiting the position of the sealing ring so as to prevent the sealing ring from being separated from the framework along the axial direction, thereby ensuring the sealing effect of the sealing ring, and the framework is tightly matched with the valve rod, so that waste gas is prevented from passing through a gap between the framework and the valve rod. .
The outer peripheral wall of the fixing section 4.1 of the bushing 4 is concavely provided with annular heat insulation grooves 4.4, and the number of the heat insulation grooves 4.4 is a plurality of heat insulation grooves and the heat insulation grooves are arranged at intervals along the axial direction of the bushing 4.
The valve casing 1 is internally provided with an exhaust cavity 1.1, the sealing section 4.2 is far away from the exhaust cavity 1.1, a heat insulation sheet 6 is further arranged between the lining 4 and the exhaust cavity 1.1, the heat insulation sheet 6 comprises a first heat insulation part 6.1 arranged between the end face of the lining 4 and the valve casing 1, a connecting part 6.2 sleeved on the valve rod 2, and a second heat insulation part 6.3 arranged on a first side wall 1.1.1 of the attached exhaust cavity 1.1, wherein the first side wall 1.1.1 is a side wall corresponding to the position of the lining 4.
The second heat insulation part 6.3 is provided with a plurality of bulges 6.4 towards the first side wall 1.1.1, and the second heat insulation part 6.3 is propped against the first side wall 1.1.1 through the bulges 6.4.
The heat insulation plate 6 is characterized in that a first limit rib 6.5 is arranged on one side of the heat insulation plate 6, a limit groove 1.2 for the first limit rib 6.5 to penetrate is formed in one side of the waste gas cavity 1.1, and the first limit rib 6.5 is matched with the limit groove 1.2 so that the heat insulation plate 6 is limited in the valve casing 1.
Wherein the connecting part 6.2 is in clearance fit with the valve housing 1, and the connecting part 6.2 is in clearance fit with the valve rod 2.
The valve casing 1 is provided with a first recess 1.3 at a position corresponding to the heat insulation sheet 6, and the bottom surface of the first recess 1.3 is arranged corresponding to the connecting part 6.2 of the heat insulation sheet 6.
The valve casing 1 is provided with a second concave 1.4 at the position corresponding to the bushing 4, and the bottom surface of the second concave 1.4 is arranged corresponding to the fixed section 4.1 of the bushing 4.
The foregoing is illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary. All changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (6)
1. The utility model provides a high temperature resistant EGR valve, includes valve casing (1), establishes valve rod (2) in valve casing (1), seal through sealing washer (3) between valve rod (2) and valve casing (1), its characterized in that: a bushing (4) is further arranged between the sealing ring (3) and the valve casing (1), the bushing (4) comprises a fixing section (4.1) which is tightly matched with the valve casing (1) and a sealing section (4.2) which is in clearance fit with the valve casing (1), the sealing section (4.2) is provided with a sealing groove (4.3) which is used for accommodating the sealing ring (3), and the sealing ring (3) is used for sealing a gap between the valve rod (2) and the bushing (4); the valve casing (1) is internally provided with an exhaust cavity (1.1), the sealing section (4.2) is far away from the exhaust cavity (1.1), a heat insulation sheet (6) is further arranged between the lining (4) and the exhaust cavity (1.1), the heat insulation sheet (6) comprises a first heat insulation part (6.1) arranged between the end face of the lining (4) and the valve casing (1), a connecting part (6.2) sleeved on the valve rod (2) and a second heat insulation part (6.3) arranged by attaching the first side wall (1.1.1) of the exhaust cavity (1.1), and the first side wall (1.1.1) is a side wall corresponding to the position where the lining (4) is located; the second heat insulation part (6.3) is provided with a plurality of bulges (6.4) towards the first side wall (1.1.1), and the second heat insulation part (6.3) is propped against the first side wall (1.1.1) through the bulges (6.4); a first limiting rib (6.5) is arranged on one side of the heat insulation sheet (6), a limiting groove (1.2) for the first limiting rib (6.5) to penetrate is formed on one side of the waste gas cavity (1.1), and the first limiting rib (6.5) is matched with the limiting groove (1.2) so that the heat insulation sheet (6) is limited in the valve casing (1); the valve casing (1) outer wall corresponds heat insulating sheet (6) department and is equipped with first sunken (1.3), the connecting portion (6.2) that the bottom surface of first sunken (1.3) corresponds heat insulating sheet (6) set up.
2. The high temperature resistant EGR valve of claim 1, wherein: a framework (5) is arranged between the sealing ring (3) and the valve rod (2), and the framework (5) is tightly matched with the valve rod (2).
3. The high temperature resistant EGR valve of claim 1, wherein: the outer peripheral wall indent of the fixed section (4.1) of bush (4) is equipped with annular heat insulation groove (4.4), the quantity of heat insulation groove (4.4) is a plurality of and along the axial interval setting of bush (4).
4. The high temperature resistant EGR valve of claim 1, wherein: the connecting part (6.2) is in clearance fit with the valve casing (1), and the connecting part (6.2) is in clearance fit with the valve rod (2).
5. The high temperature resistant EGR valve of claim 1, wherein: the side wall of the waste gas cavity (1.1) is provided with a second limit rib (1.5) for limiting the axial displacement of the heat insulation sheet (6) along the valve rod (2).
6. The high temperature resistant EGR valve of claim 1, wherein: the valve casing (1) outer wall corresponds bush (4) department and is equipped with second sunken (1.4), the bottom surface of second sunken (1.4) corresponds fixed section (4.1) setting of bush (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711324665.8A CN108087160B (en) | 2017-12-13 | 2017-12-13 | High temperature resistant EGR valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711324665.8A CN108087160B (en) | 2017-12-13 | 2017-12-13 | High temperature resistant EGR valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108087160A CN108087160A (en) | 2018-05-29 |
| CN108087160B true CN108087160B (en) | 2024-03-26 |
Family
ID=62174079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711324665.8A Active CN108087160B (en) | 2017-12-13 | 2017-12-13 | High temperature resistant EGR valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108087160B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010064296A (en) * | 1999-12-29 | 2001-07-09 | 이계안 | Egr valve |
| JP2004011422A (en) * | 2002-06-03 | 2004-01-15 | Keihin Corp | Exhaust gas recirculation valve |
| JP2013540926A (en) * | 2010-08-26 | 2013-11-07 | ピールブルク ゲゼルシャフト ミット ベシュレンクテル ハフツング | Exhaust gas recirculation valve for internal combustion engines. |
| WO2014054118A1 (en) * | 2012-10-02 | 2014-04-10 | 三菱電機株式会社 | Valve |
| CN104088730A (en) * | 2014-07-09 | 2014-10-08 | 无锡隆盛科技股份有限公司 | Sealing structure for electric EGR valves |
| CN205349569U (en) * | 2016-01-25 | 2016-06-29 | 北京美联桥科技发展有限公司 | EGR valve and electronic EGR valve gear |
| CN207554227U (en) * | 2017-12-13 | 2018-06-29 | 博格华纳排放系统（宁波）有限公司 | High temperature resistant egr valve |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7503316B2 (en) * | 2007-05-30 | 2009-03-17 | Delphi Technologies, Inc. | Anti-coking bushing assembly for an exhaust recirculation control valve |
-
2017
- 2017-12-13 CN CN201711324665.8A patent/CN108087160B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010064296A (en) * | 1999-12-29 | 2001-07-09 | 이계안 | Egr valve |
| JP2004011422A (en) * | 2002-06-03 | 2004-01-15 | Keihin Corp | Exhaust gas recirculation valve |
| JP2013540926A (en) * | 2010-08-26 | 2013-11-07 | ピールブルク ゲゼルシャフト ミット ベシュレンクテル ハフツング | Exhaust gas recirculation valve for internal combustion engines. |
| WO2014054118A1 (en) * | 2012-10-02 | 2014-04-10 | 三菱電機株式会社 | Valve |
| CN204420296U (en) * | 2012-10-02 | 2015-06-24 | 三菱电机株式会社 | Valve |
| CN104088730A (en) * | 2014-07-09 | 2014-10-08 | 无锡隆盛科技股份有限公司 | Sealing structure for electric EGR valves |
| CN205349569U (en) * | 2016-01-25 | 2016-06-29 | 北京美联桥科技发展有限公司 | EGR valve and electronic EGR valve gear |
| CN207554227U (en) * | 2017-12-13 | 2018-06-29 | 博格华纳排放系统（宁波）有限公司 | High temperature resistant egr valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108087160A (en) | 2018-05-29 |
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