CN110230558B - Valve seat structure of double-valve-core hot-end EGR valve - Google Patents
Valve seat structure of double-valve-core hot-end EGR valve Download PDFInfo
- Publication number
- CN110230558B CN110230558B CN201910581181.4A CN201910581181A CN110230558B CN 110230558 B CN110230558 B CN 110230558B CN 201910581181 A CN201910581181 A CN 201910581181A CN 110230558 B CN110230558 B CN 110230558B
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- Prior art keywords
- valve seat
- air inlet
- valve
- double
- hole
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- 238000007789 sealing Methods 0.000 claims abstract description 19
- 239000000498 cooling water Substances 0.000 claims abstract description 10
- 238000009434 installation Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 238000003754 machining Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 6
- 229910001141 Ductile iron Inorganic materials 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 17
- 238000013461 design Methods 0.000 description 9
- 238000005266 casting Methods 0.000 description 5
- 230000009977 dual effect Effects 0.000 description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000002912 waste gas Substances 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
- F02M26/66—Lift valves, e.g. poppet valves
- F02M26/68—Closing members; Valve seats; Flow passages
-
- 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
- F02M26/66—Lift valves, e.g. poppet valves
- F02M26/69—Lift valves, e.g. poppet valves having two or more valve-closing members
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
The invention relates to the technical field of engine exhaust gas recirculation, and particularly discloses a double-valve-core hot-end EGR valve seat structure, which comprises an integrally cast valve seat, wherein a central hole is formed in the upper part of the valve seat, the valve seat is provided with an air inlet, an air outlet, an upper valve sealing port and a lower valve sealing port, the air outlet is provided with a cavity in the shape of an outward-expanding horn, an air inlet channel which extends into the cavity from the air inlet to the lower part from the upper part to the upper part is arranged in the valve seat, and the side wall of the air inlet channel is a smooth curved surface; the air inlet is provided with an air inlet flange, connecting holes are respectively formed in two sides of the air inlet flange, and the end faces of the connecting holes on two sides and the flange face form an included angle larger than zero. The valve seat structure of the invention is also provided with a motor installation part, and a cooling water channel is also arranged in the valve seat. The invention effectively solves the problems of easy air leakage of the air inlet, unsmooth air flow of the air inlet and the air outlet of the double valve, unstable motor installation, poor self cooling of the valve, lower valve seat assembly quality and efficiency and the like in the prior art.
Description
Technical Field
The invention relates to the technical field of engine exhaust gas recirculation, in particular to a double-valve-core hot-end EGR valve.
Background
The EGR is totally called Exhaust Gas Recirculation, namely an exhaust gas recirculation system, which guides part of exhaust gas in the exhaust gas of the engine back to an air inlet pipe through a pipeline, is converged with the gas in the air inlet pipe, and then enters a cylinder for recirculation, so that the discharge amount of nitrogen oxide (NO X) in the exhaust gas can be effectively reduced. As automobile exhaust emissions regulations become more stringent, the effect of EGR on engines is also becoming more pronounced. The EGR valve serves as a key actuator for adjusting the flow of recirculated exhaust gas in an engine exhaust gas recirculation system (EGR system), and specifically serves to introduce a small amount of exhaust gas into a cylinder, and to reduce the temperature in the cylinder to reduce the emission of harmful gases. There are two general types of EGR valves currently in wide use in the market, one being a cold end valve and the other being a hot end valve. In the cold end valve, engine waste gas enters the valve body after being cooled, and the valve is easy to be blocked and fail due to the fact that the air inlet temperature is low and carbon accumulation is serious. In the hot-end valve, engine exhaust gas directly enters the valve body without being cooled, and carbon deposition is not easy to generate due to high air inlet temperature, so that the engine exhaust gas is not easy to be blocked and fails. Because of this advantage of the hot end valve, it is widely used on high power, high emission engines.
The existing hot-end EGR valve adopts a single valve core design, the design of an airflow channel is unreasonable, the valve core seal and the air inlet seal are poor, the assembly process is complex, and the service life is limited.
Disclosure of Invention
In view of the above, the invention aims to design a valve seat structure for a double-valve-core hot-end EGR valve, so as to solve the problems of unsmooth air flow and poor sealing of the EGR valve in the prior art, facilitate the assembly of the EGR valve and prolong the service life of the EGR valve.
In order to achieve the above purpose, the invention provides a double-valve core hot end EGR valve seat structure, which comprises a valve seat which is integrally cast, wherein the upper part of the valve seat is provided with a central hole for assembling a central rod, and the outer side of the valve seat is provided with an air inlet for connecting with an engine exhaust pipe; the valve seat is also provided with an exhaust port connected with an air inlet pipe of the engine and a cavity which is positioned in the exhaust port and is in an outward-expansion horn shape, and an air inlet channel which is bent and extends into the cavity of the exhaust port of the valve seat from outside to inside is arranged in the valve seat; the side wall of the air inlet channel in the length extension direction of the air inlet channel is a smooth curved surface, and an upper valve sealing port and a lower valve sealing port which are matched and sealed with an upper valve core and a lower valve core are respectively formed in the upper side and the lower side of the air inlet channel at the part positioned in the cavity; the air inlet is provided with an air inlet flange, connecting holes are respectively formed in two sides of the air inlet flange, and the end faces of the connecting holes on two sides form an included angle larger than zero with the flange face.
Preferably, the cavity in the exhaust port is provided with an upper side wall opposite to the upper valve sealing port and a lower side wall corresponding to the lower valve sealing port, and the upper side wall and the lower side wall are smooth curved surfaces which gradually expand from inside to outside. By adopting the design, the problem that the air flow of the air inlet and outlet of the double valve is blocked can be solved, so that the air flow is smoother.
Wherein, as a preferable technical scheme, the included angle between the end face of the connecting hole of the air inlet flange and the flange face is 10 degrees.
The upper part of the valve seat is provided with a motor installation part, the motor installation part is provided with a motor center hole for the output shaft of the motor assembly to pass through, and four installation counter bores are distributed on the periphery of the motor center hole. The motor center hole is used for locating the motor, and the four mounting counter bores are used for firmly mounting the motor on the motor mounting part through nuts. The four mounting counter bores are in a group, two holes of each group are positioned on the same circumference, and the circumferences of the two groups of mounting counter bores are different in radius.
Preferably, at least two process holes are formed in the edge of the exhaust port, and the at least two process holes are located on the edges of different sides of the exhaust port. The design of the process machining hole can facilitate the machining positioning and the assembling positioning of the valve seat.
In some embodiments, the exhaust port is rectangular, and the two process holes are located at the outer edges of two corners of the same diagonal of the rectangle. In other embodiments, the exhaust port may be configured in other shapes, such as circular, oval, etc.
Preferably, the valve seat further comprises a cooling water channel formed by machining and surrounding the central hole, wherein the cooling water channel comprises a water inlet hole and a water outlet hole which are arranged in parallel, and a communication hole penetrating into the valve seat and communicating the water inlet hole and the water outlet hole. The water inlet hole is used for connecting the water inlet pipe, and the water outlet hole is used for connecting the water outlet pipe.
Preferably, a water plug is further arranged on the outer opening of the communication hole.
In some embodiments, the valve seat is integrally cast from a high temperature ductile iron material.
By adopting the technical scheme, the invention has the following beneficial effects:
The valve seat structure of the double-valve-core hot-end EGR valve adopts a high-temperature-resistant ductile iron material integrated casting structure, so that a series of problems are solved: the air inlet is easy to leak air; the problem of unsmooth air flow; the problem of motor installation stability; the valve itself cooling problem; double-valve assembly quality and efficiency problems; and the exhaust back pressure of the high-power engine is too large, so that the EGR valve is not opened and fails. The high-temperature-resistant ductile iron material is manufactured by adopting a mode of carrying out primary machining after gravity casting, has strong stability and corrosion resistance at low temperature and high temperature, does not need to be embedded into a stainless steel sealing structure at a valve sealing position, and can play a sealing role, so that the structure is simplified, the weight of the EGR valve is reduced, the assembly is simpler and more convenient, and the assembly quality and efficiency are higher.
Therefore, compared with the prior art, the invention has the advantages of stable structure, low cost, lighter weight, simple and convenient assembly, higher assembly quality and the like.
Drawings
FIG. 1 is a schematic perspective view of a valve seat structure of a double-valve-core hot-end EGR valve of the invention;
FIG. 2 is a front view of the valve seat structure of the dual spool hot side EGR valve of the present invention;
FIG. 3 is a schematic cross-sectional view of an air inlet portion of a dual spool hot side EGR valve seat structure of the present invention;
FIG. 4 is an axial cross-sectional schematic view of a valve seat structure of the dual spool hot side EGR valve of the present invention;
FIG. 5 is a front view of a cross section of the seat structure of the dual spool hot side EGR valve of the present invention (at the cooling water channel);
FIG. 6 is an air intake schematic diagram of a valve seat structure of the double-spool hot-end EGR valve of the present invention;
FIG. 7 is a schematic diagram of the outlet of the valve seat structure of the dual spool hot side EGR valve of the present invention.
Detailed Description
The following detailed description of the invention is presented in conjunction with the drawings to provide those skilled in the art with a better understanding of the advantages and features of the invention, and to provide a clearer and more accurate definition of the scope of the invention.
As shown in fig. 1-3, the valve seat structure of the double-valve-core hot-end EGR valve is formed by integrally casting a high-temperature-resistant ductile iron material and then machining. The valve seat comprises a valve seat 1 which is integrally cast, a central hole 2 for assembling a central rod is formed in the upper part of the valve seat 1, and an air inlet 3 for connecting with an engine exhaust pipe is formed in the outer side of the valve seat 1; the valve seat 1 is also provided with an exhaust port 4 for connecting with an engine air inlet pipe and a cavity 41 which is positioned in the exhaust port 4 and is in an outward-expansion horn shape, and the valve seat 1 is internally provided with an air inlet channel 11 which is bent and extends into the cavity 41 from outside to inside from bottom to top; the side walls 111, 112 of the air inlet channel 11 in the length extending direction are smooth curved surfaces, and the upper and lower sides of the air inlet channel 11 in the cavity 41 are respectively provided with an upper valve sealing port 5 and a lower valve sealing port 6 which are matched and sealed with the upper valve core and the lower valve core.
The cavity in the exhaust port 4 has an upper side wall 411 opposite to the upper valve sealing port 5 and a lower side wall 412 corresponding to the lower valve sealing port 6, and the upper side wall and the lower side wall are smoothly curved surfaces expanding gradually from inside to outside. Because the engine exhaust back pressure is big, adopt the design of double valve, at first can balance inside and outside gas and ensure the steady operation of EGR valve, secondly adopt loudspeaker form gas vent structure and smooth curved upper and lower lateral wall can solve double valve and advance, the gas outlet air current is blocked the problem. In this embodiment, two processing holes 42 are formed on the edge of the exhaust port 4, and the two processing holes 42 are located on the edges of different sides of the exhaust port 4. In addition, the exhaust port 4 is preferably rectangular, and the two process holes 42 are located at the outer edges of the two corners of the same diagonal line of the rectangle. In other embodiments, the exhaust port may be configured in other shapes, such as circular, oval, etc. The design of the process machining hole can facilitate the machining positioning and the assembling positioning of the valve seat.
As shown in fig. 1 and 4, an air inlet flange 31 is disposed at the air inlet 3, connecting holes 32 are respectively disposed at two sides of the air inlet flange 31, and an included angle greater than zero is formed between the end surfaces 321 of the connecting holes 32 and the flange surface 311 at two sides. In this embodiment, the air inlet is connected to the exhaust pipe of the engine through a gasket, and the air inlet flange 31 is designed to have an included angle of 10 ° between the end face 321 of the connecting hole 32 of the air inlet flange 31 and the flange face 311 as shown in fig. 3, so that the engine exhaust flange, the connecting gasket and the air inlet flange 31 can be well sealed when the screws are screwed down. The outer end edge of the air inlet 3 is provided with a conical angle with a height a to facilitate assembly. The air inlet structure design of the embodiment can well solve the leakage defect of the traditional face-to-face connection.
The upper portion of the valve seat 1 is provided with a motor mounting portion 7, a motor center hole 71 for the output shaft of the torque motor assembly to pass through is formed in the motor mounting portion 7, and four mounting counter bores 72 are distributed on the periphery of the motor center hole 71. The motor center hole 71 is used for positioning the motor, and the four mounting counter bores 72 are used for firmly mounting the motor on the motor mounting portion 7 by nuts. Four mounting counterbores 72 are arranged in pairs, two mounting counterbores 72 of each pair are located on the same circumference, and the circumferences of the two mounting counterbores 72 are different in radius.
As shown in fig. 1 and 5, the valve seat 1 further includes a cooling water passage formed by machining around the central hole 2, the cooling water passage including a water inlet hole 8 and a water outlet hole 9 arranged in parallel, and a communication hole 10 penetrating into the valve seat 1 to communicate the water inlet hole 8 and the water outlet hole 9. The water inlet hole 8 is used for connecting a water inlet pipe, and the water outlet hole 9 is used for connecting a water outlet pipe. After the EGR valve is assembled, a water block 20 is further provided on the outer opening of the communication hole 10. Because the molding process of the valve seat of the embodiment is casting, the casting nozzle is arranged on the cooling water channel on the die, and the structure of the cooling water channel adopts a water inlet hole 8 and a water outlet hole 9 which are formed by machining and are respectively used for press-fitting a water inlet pipe and a water outlet pipe. The cooling water channel design of the embodiment can effectively solve the cooling problem of the valve.
As shown in fig. 6 and 7, in operation, the valve seat structure of the present embodiment allows exhaust gas from an engine exhaust pipe to enter the valve through the intake port 3, along the intake passage 11, then enter the cavity through the upper and lower valve sealing ports, and then be discharged through the exhaust port 4 to enter the engine intake manifold.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the present invention and to implement the same, but are not intended to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (6)
1. The double-valve-core hot-end EGR valve seat structure is characterized by comprising a valve seat which is integrally cast, wherein the upper part of the valve seat is provided with a central hole for assembling a central rod, and the outer side of the valve seat is provided with an air inlet for being connected with an engine exhaust pipe; the valve seat is also provided with an exhaust port connected with an air inlet pipe of the engine and a cavity which is positioned in the exhaust port and is in an outward-expansion horn shape, and an air inlet channel which is bent and extends into the cavity of the exhaust port of the valve seat from outside to inside is arranged in the valve seat; the side wall of the air inlet channel in the length extension direction of the air inlet channel is a smooth curved surface, and an upper valve sealing port and a lower valve sealing port which are matched and sealed with an upper valve core and a lower valve core are respectively formed in the upper side and the lower side of the air inlet channel at the part positioned in the cavity; an air inlet flange is arranged at the air inlet, connecting holes are respectively formed in two sides of the air inlet flange, and the end surfaces of the connecting holes on two sides form an included angle larger than zero with the flange surface;
the cavity in the exhaust port is provided with an upper side wall opposite to the upper valve sealing port and a lower side wall corresponding to the lower valve sealing port, and the upper side wall and the lower side wall are smooth curved surfaces which gradually expand from inside to outside;
The cooling water channel is formed in the valve seat by machining and surrounds the central hole, and comprises a water inlet hole and a water outlet hole which are arranged in parallel, and a communication hole which penetrates into the valve seat and is communicated with the water inlet hole and the water outlet hole;
the valve seat is integrally cast by adopting a high-temperature-resistant ductile iron material.
2. The double-spool hot-end EGR valve seat structure according to claim 1, characterized in that: the included angle is 10 degrees.
3. The double-spool hot-end EGR valve seat structure according to claim 1, characterized in that: the upper portion of the valve seat is provided with a motor installation portion, a motor center hole for the output shaft of the motor assembly to pass through is formed in the motor installation portion, and four installation counter bores are distributed on the periphery of the motor center hole.
4. The double-spool hot-end EGR valve seat structure according to claim 1, characterized in that: at least two process machining holes are formed in the edge of the exhaust port, and the at least two process machining holes are located on the edges of different sides of the exhaust port.
5. The double-valve-core hot-end EGR valve seat structure as claimed in claim 4, wherein: the exhaust port is rectangular, and the two process machining holes are positioned at the outer side edges of two corners of the same diagonal line of the rectangle.
6. The double-spool hot-end EGR valve seat structure according to claim 1, characterized in that: and a water plug is also arranged on the outer opening of the communication hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910581181.4A CN110230558B (en) | 2019-06-29 | 2019-06-29 | Valve seat structure of double-valve-core hot-end EGR valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910581181.4A CN110230558B (en) | 2019-06-29 | 2019-06-29 | Valve seat structure of double-valve-core hot-end EGR valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110230558A CN110230558A (en) | 2019-09-13 |
| CN110230558B true CN110230558B (en) | 2024-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910581181.4A Active CN110230558B (en) | 2019-06-29 | 2019-06-29 | Valve seat structure of double-valve-core hot-end EGR valve |
Country Status (1)
| Country | Link |
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| CN (1) | CN110230558B (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4881664A (en) * | 1988-09-13 | 1989-11-21 | The Meyer Company | Disposable valve with disk-like valve element |
| EP0687842A2 (en) * | 1994-06-17 | 1995-12-20 | Mitsubishi Denki Kabushiki Kaisha | Motor driven type flow rate controlling valve |
| DE10011916A1 (en) * | 2000-03-11 | 2001-09-13 | Pierburg Ag | Exhaust gas feed-back valve body has housing in which valve rod is displaceably arranged, on which at least one valve head is fitted |
| DE10032148A1 (en) * | 2000-07-01 | 2002-01-10 | Pierburg Ag | Exhaust gas feed-back device for internal combustion engine has feed-back channel with outlet aperture in air suction channel |
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| CN206600215U (en) * | 2017-02-28 | 2017-10-31 | 安徽江淮汽车集团股份有限公司 | A kind of EGR valve seat |
| CN107587958A (en) * | 2017-10-27 | 2018-01-16 | 无锡隆盛科技股份有限公司 | A kind of valve element assembling structure of double spool EGR valve |
| CN207297196U (en) * | 2017-10-27 | 2018-05-01 | 无锡隆盛科技股份有限公司 | A kind of valve core structure of double spool EGR valve |
| CN108979906A (en) * | 2018-08-03 | 2018-12-11 | 潍柴动力股份有限公司 | A kind of EGR valve and engine |
| CN210264962U (en) * | 2019-06-29 | 2020-04-07 | 无锡同益汽车动力技术有限公司 | Double-valve-element hot-end EGR valve seat structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013112018B4 (en) * | 2013-10-31 | 2018-12-20 | Pierburg Gmbh | Valve system for internal combustion engines |
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2019
- 2019-06-29 CN CN201910581181.4A patent/CN110230558B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4881664A (en) * | 1988-09-13 | 1989-11-21 | The Meyer Company | Disposable valve with disk-like valve element |
| EP0687842A2 (en) * | 1994-06-17 | 1995-12-20 | Mitsubishi Denki Kabushiki Kaisha | Motor driven type flow rate controlling valve |
| DE10011916A1 (en) * | 2000-03-11 | 2001-09-13 | Pierburg Ag | Exhaust gas feed-back valve body has housing in which valve rod is displaceably arranged, on which at least one valve head is fitted |
| DE10032148A1 (en) * | 2000-07-01 | 2002-01-10 | Pierburg Ag | Exhaust gas feed-back device for internal combustion engine has feed-back channel with outlet aperture in air suction channel |
| DE10048499B4 (en) * | 2000-10-07 | 2013-03-07 | Pierburg Gmbh | Exhaust gas recirculation device |
| CN101287901A (en) * | 2005-09-08 | 2008-10-15 | 贝洱两合公司 | Device for controlling an exhaust gas stream |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN110230558A (en) | 2019-09-13 |
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