CN210264962U

CN210264962U - Double-valve-element hot-end EGR valve seat structure

Info

Publication number: CN210264962U
Application number: CN201921005867.0U
Authority: CN
Inventors: 陈华; 肖泫岑; 冯志文
Original assignee: Wuxi Tongyi Automobile Power Technology Co ltd
Current assignee: Wuxi Tongyi Automobile Power Technology Co ltd
Priority date: 2019-06-29
Filing date: 2019-06-29
Publication date: 2020-04-07
Anticipated expiration: 2029-06-29

Abstract

The utility model relates to the technical field of engine exhaust gas recirculation, in particular to a double-valve-core hot-end EGR valve seat structure, which comprises an integrally cast valve seat, wherein the upper part of the valve seat is provided with a central hole, 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 flared cavity, an air inlet channel which is bent from the air inlet to the lower part and extends into the cavity is arranged in the valve seat, and the side wall of the air inlet channel is a smooth curved surface; an air inlet flange is arranged at the air inlet, connecting holes are respectively arranged on two sides of the air inlet flange, and the end surfaces of the connecting holes on the two sides and the flange surface form an included angle larger than zero. The utility model discloses a disk seat structure still has the motor installation department, still is equipped with the cooling water course in the disk seat. The utility model discloses solved the easy gas leakage of air inlet among the prior art effectively, the bivalve advances, the gas outlet air current is not smooth, and the motor installation is unstable, and the cooling of valve itself is not good, the lower scheduling problem of disk seat assembly quality and efficiency.

Description

Double-valve-element hot-end EGR valve seat structure

Technical Field

The utility model relates to an engine exhaust gas recirculation technical field especially relates to a double-valve-core hot junction EGR valve.

Background

EGR is called Exhaust Gas Recirculation (EGR) system, which guides part of Exhaust Gas in engine Exhaust back to air inlet pipe through pipeline, joins with Gas in air inlet pipe, then enters cylinder for Recirculation, and can effectively reduce Nitrogen Oxide (NO) in Exhaust Gas_X) The discharge amount of (2). With the stricter and stricter automobile exhaust emission regulations, the role of EGR on engines is more and more obvious. The EGR valve is used as a key execution element in an engine exhaust gas recirculation system (EGR system) for adjusting the flow of recirculated exhaust gas, and particularly has the function of introducing a small amount of exhaust gas into a cylinder and reducing the temperature in the cylinder to reduce the emission of harmful gases. There are two types of EGR valves widely used in the market, one is a cold-end valve and the other is a hot-end valve. In the cold end valve, engine exhaust gas enters the valve body after being cooled, and the valve is easy to block and lose efficacy due to low air inlet temperature and serious carbon accumulation. In the hot end valve, engine waste gas directly enters the valve body without being cooled, and carbon deposit is not easy to generate due to high air inlet temperature, so that the valve is not easy to block and lose efficacy. Because of its advantages, hot end valves are widely used on high power, high emission engines.

The existing hot end EGR valve adopts a single valve core design, an airflow channel is unreasonable in design, a valve core is not good in sealing and an air inlet is not good in sealing, the assembling process is complex, and the service life is limited.

Disclosure of Invention

The utility model discloses the purpose is in order to overcome prior art not enough and provide a disk seat structure for double-valve-core hot junction EGR valve to solve prior art EGR valve gas flow not smooth, sealed not good problem, make the assembly of EGR valve more convenient, improve the life of EGR valve.

In order to achieve the above purpose, the utility model adopts the technical scheme that: a double-valve-core hot-end EGR valve seat structure comprises an integrally cast valve seat, 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 engine intake pipe and a cavity which is positioned in the exhaust port and is in an outward-expanding horn shape, and an intake passage which is bent from the outside to the inside and extends into the cavity of the exhaust port of the valve seat 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 opening and a lower valve sealing opening which are matched and sealed with the upper valve core and the lower valve core are respectively formed in the upper side and the lower side of the part of the air inlet channel positioned in the cavity; the air inlet is provided with an air inlet flange, two sides of the air inlet flange are respectively provided with a connecting hole, and the end surfaces of the connecting holes and the flange surface form an included angle larger than zero.

Preferably, the cavity in the exhaust port has an upper sidewall opposite to the upper valve sealing port and a lower sidewall corresponding to the lower valve sealing port, and the upper sidewall and the lower sidewall are smoothly curved surfaces gradually expanding from inside to outside. By adopting the design, the problem that air flows at the air inlet and the air outlet of the double valve are blocked can be solved, so that the air flows are smoother.

As an optimal technical scheme, the included angle formed by the end face of the connecting hole of the air inlet flange and the flange face is 10 degrees.

The upper portion of the valve seat is provided with a motor installation portion, a motor center hole for an output shaft of the motor assembly to penetrate is formed in the motor installation portion, and four installation counter bores are distributed in the periphery of the motor center hole. The motor centre bore is used for fixing a position the motor, and four installation counter bores are used for installing the motor on the motor installation department through the nut firmly. The four mounting counter bores are grouped in pairs, two holes in each group are located on the same circumference, and the circumferences of the two groups of mounting counter bores have different radiuses.

Preferably, at least two craft processing holes are formed in the edge of the exhaust port, and the at least two craft processing holes are located in 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 two of the tooling holes are located at the outer edges of two corners of the same diagonal of the rectangle. In other embodiments, the vent may be designed in other shapes, such as circular or oval.

Preferably, the valve seat further comprises a cooling water channel formed by machining and surrounding the central hole, the cooling water channel comprises a water inlet hole and a water outlet hole which are arranged in parallel, and a communication hole penetrating through the valve seat and communicating the water inlet hole and the water outlet hole. The water inlet hole is used for connecting a water inlet pipe, and the water outlet hole is used for connecting a water outlet pipe.

Preferably, the outer opening of the communication hole is also provided with a water plug.

In some embodiments, the valve seat is integrally cast from a high temperature ductile iron material.

Due to the adoption of the technical scheme, the utility model discloses following beneficial effect is reached:

the utility model discloses a double-valve-core hot junction EGR valve disk seat structure adopts the integrative casting structure of high temperature resistant ductile iron material, has solved a series of problems: the air inlet is easy to leak air; the problem of unsmooth airflow; the problem of the installation stability of the motor; problems with cooling of the valve itself; the problem of double-valve problem making assembly quality and efficiency is solved; the exhaust back pressure of the high-power engine is too large, so that the EGR valve cannot be opened and fails. The utility model discloses a mode that high temperature resistant ductile iron material carries out first machining after gravity casting is made, and this kind of material has very strong stability and corrosion resistance at low temperature and high temperature, need not to imbed stainless steel seal structure in valve seal department, and the body just can play sealed effect, has not only simplified the structure, more makes EGR valve weight loss, assembles more portably, and assembly quality and efficiency are higher.

Therefore, compare in prior art, the utility model has the advantages of stable in structure, low cost, weight are lighter, the assembly is simple and convenient and assembly quality is higher.

Drawings

FIG. 1 is a schematic perspective view of a valve seat structure of a double-valve-core hot-end EGR valve of the present invention;

FIG. 2 is a front view of the valve seat structure of the double-valve-core hot-end EGR valve of the present invention;

FIG. 3 is a schematic cross-sectional view of a portion of an air inlet of a valve seat structure of a dual-valve-core hot-end EGR valve of the present invention;

FIG. 4 is an axial cross-sectional view of the valve seat structure of the dual-valve-core hot-end EGR valve of the present invention;

FIG. 5 is a front view of a transverse section of a valve seat structure of the double-valve-core hot-end EGR valve of the present invention (at the cooling water channel);

FIG. 6 is a schematic air inlet diagram of the valve seat structure of the double-valve-core hot-end EGR valve of the present invention;

figure 7 is the schematic diagram of giving vent to anger of double-valve-core hot junction EGR valve disk seat structure of the utility model.

Detailed Description

The invention will be further described with reference to examples of embodiments shown in the drawings.

As shown in fig. 1-3, a valve seat structure of a hot-end EGR valve with double valve cores is integrally cast and formed by using a high-temperature-resistant ductile iron material and then machined. The valve seat comprises an integrally cast valve seat 1, wherein the upper part of the valve seat 1 is provided with a central hole 2 for assembling a central rod, and the outer side of the valve seat 1 is provided with an air inlet 3 for connecting with an engine exhaust pipe; the valve seat 1 is also provided with an exhaust port 4 used for being connected with an engine intake pipe and a cavity 41 which is positioned in the exhaust port 4 and is in an outward expanding horn shape, and an intake passage 11 which is bent from the outside to the inside from the bottom to the top and extends into the cavity 41 is arranged in the valve seat 1; the

side walls

111 and 112 of the air inlet channel 11 in the extending direction of the length of the air inlet channel 11 are smooth curved surfaces, and the upper side and the lower side of the part 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 sidewall 411 opposite to the upper valve seal port 5 and a lower sidewall 412 corresponding to the lower valve seal port 6, and the upper sidewall and the lower sidewall are smoothly curved surfaces gradually expanding from inside to outside. Because the engine exhaust back pressure is big, adopt the design of bivalve, at first can balance inside and outside gas guarantee EGR valve even running, secondly adopt trumpet-shaped gas vent structure and slick and sly curved surface's upper and lower lateral wall can solve bivalve and advance, the gas flow of gas outlet is obstructed the problem. In the present embodiment, two tooling holes 42 are formed on the edge of the exhaust port 4, and the two tooling holes 42 are located on the edge of the exhaust port 4 on different sides. In addition, the exhaust port 4 is preferably rectangular, and the two tooling holes 42 are located at the outer edges of the two corners of the same diagonal of the rectangle. In other embodiments, the vent may be designed in other shapes, such as circular or oval. 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, connection holes 32 are respectively disposed at two sides of the air inlet flange 31, and end surfaces 321 of the connection holes 32 at two sides and a flange surface 311 form an included angle greater than zero. In this embodiment, the portion of the intake port is connected to the exhaust pipe of the engine through the sealing gasket, and to avoid exhaust gas leakage caused by excessive exhaust back pressure, the portion of the intake port flange 31 is designed as shown in fig. 3, an included angle formed by the end face 321 of the connecting hole 32 of the intake port flange 31 and the flange face 311 is 10 °, and after an inclined plane is formed, the exhaust flange, the connecting sealing gasket, and the intake flange 31 of the engine can be well sealed in a matching manner when the screw is tightened. The outer end edge of the air inlet 3 is provided with a taper angle of height a to facilitate assembly. The air inlet structure design of the embodiment can well solve the leakage defect of the traditional surface-to-surface connection.

The upper part of the valve seat 1 is provided with a motor mounting part 7, the motor mounting part 7 is provided with a motor center hole 71 for an output shaft of a torque motor assembly to penetrate through, 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 counterbores 72 are used for firmly mounting the motor on the motor mounting portion 7 through nuts. The four mounting counterbores 72 are grouped in pairs, the two mounting counterbores 72 in each group are located on the same circumference, and the circumferential radii of the two groups of mounting counterbores 72 are different.

As shown in fig. 1 and 5, the valve seat 1 further includes a cooling water channel surrounding the central hole 2, which is formed by machining, and includes a water inlet 8 and a water outlet 9 arranged in parallel, and a communication hole 10 penetrating the valve seat 1 and communicating the water inlet 8 and the water outlet 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 plug 20 is arranged on the outer opening of the communication hole 10. Because the forming process of the valve seat of the embodiment is casting, the casting opening is arranged on the cooling water channel on the mould, and the structure of the cooling water channel adopts the water inlet hole 8 and the water outlet hole 9 which are formed by machining and are respectively used for press-fitting the water inlet pipe and the water outlet pipe. The cooling water channel design of the present embodiment can effectively solve the cooling problem of the valve itself.

As shown in fig. 6 and 7, in the valve seat structure of the present embodiment, when in operation, exhaust gas from an exhaust pipe of an engine enters from the intake port 3, enters the valve along the intake passage 11, enters the cavity through the upper and lower valve sealing ports, and is discharged from the exhaust port 4 to enter the intake manifold of the engine.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. A valve seat structure of a double-valve-core hot-end EGR valve is characterized by comprising an integrally cast valve seat, 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 engine intake pipe and a cavity which is positioned in the exhaust port and is in an outward-expanding horn shape, and an intake passage which is bent from the outside to the inside and extends into the cavity of the exhaust port of the valve seat 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 opening and a lower valve sealing opening which are matched and sealed with the upper valve core and the lower valve core are respectively formed in the upper side and the lower side of the part of the air inlet channel positioned in the cavity; the air inlet is provided with an air inlet flange, two sides of the air inlet flange are respectively provided with a connecting hole, and the end surfaces of the connecting holes and the flange surface form an included angle larger than zero.

2. The valve seat structure of the double-valve-core hot-end EGR valve according to claim 1, characterized in that: 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 gradually expanding from inside to outside.

3. The valve seat structure of the double-valve-core hot-end EGR valve according to claim 1, characterized in that: the included angle is 10 degrees.

4. The valve seat structure of the double-valve-core hot-end EGR valve 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 an output shaft of the power supply motor assembly to penetrate is formed in the motor installation portion, and four installation counter bores are distributed in the periphery of the motor center hole.

5. The valve seat structure of the double-valve-core hot-end EGR valve according to claim 1, characterized in that: at least two technical processing holes are formed in the edge of the exhaust port, and the at least two technical processing holes are located in the edges of different sides of the exhaust port.

6. The valve seat structure of the double-valve-core hot-end EGR valve according to claim 5, characterized in that: the exhaust port is rectangular, and the two process machining holes are located at the outer side edges of two corners of the same diagonal line of the rectangle.

7. The valve seat structure of the double-valve-core hot-end EGR valve according to claim 1, characterized in that: the valve seat is also internally provided with a cooling water channel which is formed by machining and surrounds the central hole, and the cooling water channel comprises a water inlet hole and a water outlet hole which are arranged in parallel and a communication hole which penetrates through the valve seat and is communicated with the water inlet hole and the water outlet hole.

8. The valve seat structure of the double-valve-core hot-end EGR valve according to claim 7, characterized in that: and a water plug is also arranged on the outer opening of the communicating hole.

9. The valve seat structure of the hot end EGR valve with double valve cores as claimed in any one of claims 1 to 8, wherein: the valve seat is integrally cast and formed by adopting a high-temperature-resistant ductile iron material.