阅读说明：本技术 一种egr阀双阀芯中心杆结构 (EGR valve double-valve-core central rod structure ) 是由 陈华 肖泫岑 冯志文 于 2019-10-08 设计创作，主要内容包括：本发明揭露了一种EGR阀双阀芯中心杆结构,所述双阀芯中心杆用于和所述EGR阀的阀座的第一阀座阀门和第二阀座阀门相互配合,从而实现所述阀座的第一阀座阀门和第二阀座阀门的开启和关闭,其特征在于,所述双阀芯中心杆包括：一中心杆、一第一阀芯和一第二阀芯,其中所述第一阀芯和所述第二阀芯安装于所述中心杆上；当将所述双阀芯中心杆安装在所述EGR阀的阀座上时,所述双阀芯中心杆的第一阀芯和所述阀座的第一阀座阀门相互配合,所述双阀芯中心杆的第二阀芯和所述阀座的第二阀座阀门相互配合；当所述EGR阀不工作时,所述双阀芯中心杆的第一阀芯将所述阀座的第一阀座阀门堵住,所述双阀芯中心杆的第二阀芯将所述阀座的第二阀座阀门堵住。(The invention discloses a double-valve core center rod structure of an EGR valve, wherein the double-valve core center rod is used for being matched with a first valve seat valve and a second valve seat valve of a valve seat of the EGR valve, so that the first valve seat valve and the second valve seat valve of the valve seat are opened and closed, and the double-valve core center rod structure is characterized by comprising: a center rod, a first valve spool and a second valve spool, wherein the first valve spool and the second valve spool are mounted on the center rod; when the double-valve-core center rod is installed on the valve seat of the EGR valve, the first valve core of the double-valve-core center rod is matched with the first valve seat valve of the valve seat, and the second valve core of the double-valve-core center rod is matched with the second valve seat valve of the valve seat; when the EGR valve does not work, the first valve core of the central rod of the double valve cores plugs the first valve seat of the valve seat, and the second valve core of the central rod of the double valve cores plugs the second valve seat of the valve seat.)

1. A dual-seat center rod structure of an EGR valve, the dual-seat center rod being configured to cooperate with a first seat valve and a second seat valve of a seat of the EGR valve to enable opening and closing of the first seat valve and the second seat valve of the seat, the dual-seat center rod comprising: a center rod, a first valve spool and a second valve spool, wherein the first valve spool and the second valve spool are mounted on the center rod; when the double-valve-core center rod is installed on the valve seat of the EGR valve, the first valve core of the double-valve-core center rod is matched with the first valve seat valve of the valve seat, and the second valve core of the double-valve-core center rod is matched with the second valve seat valve of the valve seat; when the EGR valve does not work, the first valve core of the central rod of the double valve cores plugs the first valve seat of the valve seat, and the second valve core of the central rod of the double valve cores plugs the second valve seat of the valve seat; when the EGR valve works, the EGR valve moves back and forth along with the reciprocating linear motion of the central rod of the double valve core, so that the first valve seat valve and the second valve seat valve of the valve seat are closed and opened circularly.

2. The dual spool, center rod configuration of an EGR valve of claim 1, wherein the center rod includes a center rod first section, a center rod second section extending axially linearly from the center rod first section, a center rod third section extending axially linearly from the center rod second section, a center rod fourth section extending axially linearly from the center rod third section, and a center rod fifth section extending axially linearly from the center rod fourth section; wherein the first spool is mounted on the second section of the central rod and the second spool is mounted on the fifth section of the central rod.

3. The two-spool, center rod structure of an EGR valve according to claim 2, wherein said first spool has a first mounting hole axially therethrough, said second spool has a second mounting hole axially therethrough, and wherein a center rod second section of said center rod is inserted into said first mounting hole of said first spool, whereby said first spool and said center rod are fixedly coupled together; the fifth section of the center rod is inserted into the second mounting hole of the second valve core, so that the second valve core and the center rod are fixedly connected together.

4. The dual-spool central rod structure of an EGR valve according to claim 3, wherein the engagement between the second end of the central rod and the first spool is transition engagement, so that the second section of the central rod and the first spool achieve better concentricity and positional accuracy during assembly.

5. The dual spool center rod structure of an EGR valve according to claim 2, wherein the third section of the center rod is configured to support the first spool when the first spool is mounted on the second section of the center rod, so that the diameter of the third section of the center rod is larger than the inner diameter of the first mounting hole of the first spool.

6. The dual spool, central rod structure of an EGR valve according to claim 5, wherein the circumference of the third section of the central rod is 1mm larger than the circumference of the inner diameter of the first mounting hole of the first spool.

7. The dual-spool, central rod structure of an EGR valve according to claim 2, wherein the diameter of the fourth segment of the central rod is 4 mm.

8. The two-spool center rod structure of an EGR valve according to any of claims 1-7, wherein the sealing engagement between the first spool and the first valve seat of the valve seat and between the second spool and the second valve seat of the valve seat is implemented by a spool spherical surface SR8, and when the first spool and the first valve seat of the valve seat and between the second spool and the second valve seat of the valve seat are tightly engaged, a first sealing surface and a second sealing surface are formed, wherein the first sealing surface and the second sealing surface are linear sealing surfaces, and the included angle formed between the first sealing surface and the second sealing surface is 90 °.

9. The two-spool center rod structure of an EGR valve in accordance with claim 8, wherein the maximum outer diameter D1 of the first spool is larger than the maximum inner diameter D2 of the first valve seat valve, and D1 is smaller than the maximum inner diameter D3 of the second valve seat valve in order to ensure smooth assembly.

10. The dual-spool center rod structure of an EGR valve according to any of claims 2 to 7, wherein a chamfer and a fillet are provided at the other end of the center rod first section of the center rod of the dual-spool center rod with respect to the center rod second end; the center rod of the double valve cores is made of stainless steel 316, and the first valve core and the second valve core are both made of stainless steel 304.

Technical Field

The invention relates to a control device of an engine exhaust gas recirculation system, in particular to a double-valve-core central rod structure of an EGR valve.

Background

In the working process of the electric EGR valve, after the motor reduces the speed and increases the torque through the reduction gear box, the rotary motion of the motor is converted into the linear motion of the valve rod through the eccentric wheel, so that the EGR valve is opened and closed. In the working process of the EGR valve, the valve core of the central rod plays a role in opening and closing the valve and controlling the flow of the valve. As a key part of the EGR valve, the stability and the safety of the valve core structure of the center rod play a great role.

Disclosure of Invention

In view of the above, the invention provides a double-valve-core central rod structure of an EGR valve, which is not easy to leak, has a stable structure, high corrosion resistance, a greatly prolonged service life, good sealing performance, and reduced weight and cost.

In order to achieve the above object, the present invention provides a dual-spool center rod structure of an EGR valve, the dual-spool center rod being configured to cooperate with a first valve seat valve and a second valve seat valve of a valve seat of the EGR valve, so as to open and close the first valve seat valve and the second valve seat valve of the valve seat, the dual-spool center rod comprising: a center rod, a first valve spool and a second valve spool, wherein the first valve spool and the second valve spool are mounted on the center rod; when the double-valve-core center rod is installed on the valve seat of the EGR valve, the first valve core of the double-valve-core center rod is matched with the first valve seat valve of the valve seat, and the second valve core of the double-valve-core center rod is matched with the second valve seat valve of the valve seat. When the EGR valve does not work, the first valve core of the central rod of the double valve cores plugs the first valve seat of the valve seat, and the second valve core of the central rod of the double valve cores plugs the second valve seat of the valve seat; when the EGR valve works, the EGR valve moves back and forth along with the reciprocating linear motion of the central rod of the double valve core, so that the first valve seat valve and the second valve seat valve of the valve seat are closed and opened circularly.

Further, the center rod includes a first center rod section, a second center rod section axially linearly extending from the first center rod section, a third center rod section axially linearly extending from the second center rod section, a fourth center rod section axially linearly extending from the third center rod section, and a fifth center rod section axially linearly extending from the fourth center rod section; wherein the first spool is mounted on the second section of the central rod and the second spool is mounted on the fifth section of the central rod.

Further, the first valve core has a first mounting hole axially penetrating therethrough, the second valve core has a second mounting hole axially penetrating therethrough, wherein the second section of the center rod is inserted into the first mounting hole of the first valve core, so that the first valve core and the center rod are fixedly connected together; the fifth section of the center rod is inserted into the second mounting hole of the second valve core, so that the second valve core and the center rod are fixedly connected together.

Further, the second end of the central rod and the first valve core are in transition fit, so that the second section of the central rod and the first valve core achieve good concentricity and position degree in the assembling process.

Further, after the first valve core is installed on the second section of the center rod, the third section of the center rod is used for supporting the first valve core, so that the diameter of the third section of the center rod is larger than the inner diameter of the first installation hole of the first valve core.

Furthermore, the perimeter of the third section of the central rod is 1mm larger than the perimeter of the inner diameter of the first mounting hole of the first valve core, so that the assembly of the central rod and the first valve core can achieve good stability and improved strength.

Furthermore, the diameter of the fourth section of the central rod is 4mm, so that the design strength is met, the high elasticity and toughness are achieved in the whole EGR valve, and the fourth section of the central rod is used for adjusting the fit clearance between the second valve core and the second valve seat valve of the valve seat in the working process of the EGR valve, so that the sealing reliability of the whole EGR valve is guaranteed to a certain extent.

Further, the fifth section of the central rod and the second spool cooperate with each other such that the second spool is mounted on the central rod.

Further, valve core spherical surfaces SR8 are adopted at the sealing matching positions between the first valve core and the first valve seat valve of the valve seat and between the second valve core and the second valve seat valve of the valve seat, and when the first valve core and the first valve seat valve of the valve seat and the second valve core and the second valve seat valve of the valve seat are tightly fitted, a first sealing surface and a second sealing surface are formed, wherein the first sealing surface and the second sealing surface are linear sealing surfaces, and an included angle formed between the first sealing surface and the second sealing surface is 90 °.

Further, the maximum outer diameter D1 of the first valve core is larger than the maximum inner diameter D2 of the first valve seat valve, and D1 is smaller than the maximum inner diameter D3 of the second valve seat valve to ensure smooth assembly.

Furthermore, the other end, opposite to the second end, of the first section of the central rod of the double-valve-core central rod is provided with a chamfer and a fillet, so that the double-valve-core central rod and the valve seat can be guided and smoothly transited during assembly, and the assembly manufacturability is ensured without damaging related parts on the EGR valve.

Further, the EGR valve works in a severe environment with the engine exhaust gas temperature of about 650 ℃ for a long time, in order to adapt to the environment and improve the corrosion resistance and the high-temperature stability, the central rod of the double-valve-core central rod is made of stainless steel 316, and the first valve core and the second valve core are both made of stainless steel 304.

Drawings

FIG. 1 is a schematic diagram of an EGR valve body;

FIG. 2 is a schematic diagram of a dual-spool center rod structure of an EGR valve provided in the present invention;

FIG. 3 is a schematic diagram of a first valve core of a dual-core center rod structure of an EGR valve according to the present invention;

FIG. 4 is a schematic diagram of a second valve core of a dual-core center rod structure of an EGR valve according to the present invention;

FIG. 5 is a schematic structural diagram of a dual-spool center rod structure of an EGR valve according to the present invention;

fig. 6 is a schematic diagram of a second valve element and valve seat sealing structure of a dual-valve element center rod structure of an EGR valve according to the present invention.

Detailed Description

The technical solution in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

It is to be understood that the described embodiments are merely some embodiments and not all embodiments of the present application, and that the following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application and its applications.

In the present invention, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly and include, for example, fixed connections, detachable connections, or all manner of connections; "coupled" may be direct or indirect through an intermediary. The terms "upper", "lower", and the like indicate orientations or positional relationships based on the manner or positional relationships shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or units must have a specific orientation, be constructed and operated in a specific orientation. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1, a schematic diagram of a main body of an EGR valve is shown. As can be seen from the figure, the EGR valve comprises a valve seat 1, and a first valve seat valve 5 and a second valve seat valve 6 are arranged on the valve seat 1 and are concentric with the first valve seat valve 5. The EGR valve also comprises a double-valve-core central rod 2 of the EGR valve, wherein the double-valve-core central rod 2 is matched with a first valve seat valve 5 and a second valve seat valve 6 of a valve seat 1 on the EGR valve, so that the double-valve-core central rod 2 is fixedly arranged on the valve seat 1 of the EGR valve, then the double-valve-core central rod 2 is driven to reciprocate linearly in the working process of the EGR valve, and meanwhile, the first valve seat valve 5 and the second valve seat valve 6 of the valve seat 1 are opened and closed.

Specifically, the dual spool center rod 2 includes a center rod 21, a first spool 23, and a second spool 24, wherein the first spool 23 and the second spool 24 are mounted on the center rod 21.

More specifically, when the dual-spool center rod 2 is mounted on the valve seat 1 of the EGR valve, the first spool 23 of the dual-spool center rod 2 and the first seat valve 5 of the valve seat 1 are fitted to each other, and the second spool 24 of the dual-spool center rod 2 and the second seat valve 6 of the valve seat 2 are fitted to each other. When the EGR valve does not work, the first valve core 23 of the dual-valve-core rod 2 blocks the first valve seat valve 5 of the valve seat 1, and the second valve core 24 of the dual-valve-core rod 2 blocks the second valve seat valve 6 of the valve seat 1. When the EGR valve works, the first valve seat valve 5 and the second valve seat valve 6 of the valve seat 1 are closed and opened circularly along with the reciprocating linear motion of the double-valve-core central rod 2.

Fig. 2 is a schematic diagram showing a structure of a dual-spool center rod according to the present invention. As can be seen, the dual-spool center rod 2 includes a center rod 21 and first and second spools 23 and 24 mounted on the center rod 21, wherein the center rod 21 includes a first center rod section 211, a second center rod section 212 extending axially straight from the first center rod section 211, a third center rod section 213 extending axially straight from the second center rod section 212, a fourth center rod section 214 extending axially straight from the third center rod section 213, and a fifth center rod section 215 extending axially straight from the fourth center rod section 214; wherein the first spool 23 is mounted on the central rod second section 212 of the central rod 1 and the second spool 24 is mounted on the central rod fifth section 215 of the central rod 1.

Specifically, the first spool 23 has a first mounting hole 231 axially penetrating therethrough, and the second spool 24 has a second mounting hole 241 axially penetrating therethrough, wherein the central rod second section 212 of the central rod 21 is inserted into the first mounting hole 231 of the first spool 23, thereby fixedly connecting the first spool 23 and the central rod 21 together; the fifth segment 215 of the central rod 21 is inserted into the second mounting hole 241 of the second valve spool 24, so that the second valve spool 24 and the central rod 21 are fixedly connected together.

More specifically, the engagement between the second center rod end 212 of the center rod 21 and the first valve core 23 is transition engagement, so that the second center rod end 212 of the center rod 21 and the first valve core 23 achieve better concentricity and position during assembly.

It should be noted that, when the first valve core 23 is mounted on the central rod second section 212 of the central rod 21, the thickness of the central rod second section 212 is greater than that of the first valve core 23, so that the central rod second section 212 is easily riveted to make the central rod second section 212 and the first valve core 23 fit firmly.

Further, after the first valve element 23 is mounted on the central rod second section 212, the central rod third section 213 of the central rod 21 is used for supporting the first valve element 23, so that the diameter of the central rod third section 213 is larger than the inner diameter of the first mounting hole 231 of the first valve element 23.

Further, the circumference of the third segment 213 of the center rod is 1mm larger than the circumference of the inner diameter of the first receiving hole 231 of the first valve element 23, so that the assembly of the center rod 21 and the first valve element 23 can be stabilized and strengthened.

Further, the diameter of the fourth section 214 of the center rod 21 is 4mm, so that on one hand, the design strength is satisfied, and on the other hand, the whole EGR valve has high elasticity and toughness, and in the working process of the EGR valve, the fourth section 214 of the center rod is used for adjusting the fit clearance between the second valve core 24 and the second valve seat valve 6 of the valve seat 1, so that the sealing reliability of the whole EGR valve is ensured to a certain extent.

Further, the fifth central rod segment 215 of the central rod 21 and the second valve spool 24 cooperate with each other, so that the second valve spool 24 is mounted on the central rod 21.

Specifically, the fifth central rod section 215 of the central rod 21 is inserted into the second mounting hole 241 of the second valve spool 24, so that the second valve spool 24 is fixedly mounted on the fifth central rod section 215 of the central rod 21. After the dual valve core center rod 2 is mounted on the valve seat 1 and the sealing performance between the second valve core 24 and the second valve seat valve 6 is adjusted, the second valve core 24 and the center rod fifth section 215 of the center rod 21 are laser welded to be firmly fixed together.

It is worth mentioning that the diameter of the fifth section 215 of the center rod 21 is as large as possible under the premise of satisfying the strength and toughness, so as to increase the contact area between the fifth section 215 of the center rod and the second valve spool 24, i.e. increase the laser welding area therebetween, thereby enhancing the welding strength and reliability.

Further, the first spool 23 is to be fitted not only to the center rod 21 but also to the first seat valve 5 on the seat 1. Therefore, the thickness L1 of the first valve element 23 should be as thin as possible to achieve a certain elasticity enhancement and fit sealing performance and elasticity with the valve seat 1, in addition to satisfying the fit dimension with the center rod 21 of the first valve element 23.

Further, as shown in fig. 6, the sealing matching positions between the first valve element 23 and the first valve seat 5 of the valve seat 1 and between the second valve element 24 and the second valve seat 6 of the valve seat 1 all adopt a valve element spherical surface SR8, when the first valve element 23 and the first valve seat 5 of the valve seat 1 and the second valve element 24 and the second valve seat 6 of the valve seat 1 are tightly matched, a first sealing surface 101 and a second sealing surface 102 are formed, wherein the first sealing surface 101 and the second sealing surface 102 are linear sealing surfaces, and the included angle formed between the first sealing surface 101 and the second sealing surface is 90 °.

Further, in order to ensure that the first valve core 23 and the second valve core 24 of the dual-valve core center rod 2 are assembled with the first valve seat valve 5 and the second valve seat valve 6 of the valve seat 1 from bottom to top, the maximum outer diameter D1 of the first valve core 23 is larger than the maximum inner diameter D2 of the first valve seat valve 5, and in order to ensure smooth assembly, D1 is smaller than the maximum inner diameter D3 of the second valve seat valve 6.

Further, the other end, opposite to the second end 212, of the first section 211 of the central rod 21 of the central rod 2 of the dual-spool central rod is provided with a chamfer and a fillet, so that the dual-spool central rod 2 can be guided and smoothly transited when being assembled with the valve seat 1, and the assembly manufacturability is ensured without damaging related parts on the EGR valve.

Further, the EGR valve works in a severe environment with an engine exhaust gas temperature of about 650 ℃ for a long time, and in order to adapt to such an environment and improve corrosion resistance and high-temperature stability, the center rod 21 of the center rod 2 of the dual valve core is made of stainless steel 316, and the first valve core 23 and the second valve core 24 are both made of stainless steel 304.

The invention provides an EGR valve double-valve-core central rod assembly process which comprises the following steps: the center rod 21 of the dual-spool center rod 2 is press-fitted with the first spool 23 and then press-riveted, then the first spool 23 and the second spool 24 enter the valve seat 1 through guide holes on the first valve seat valve 5 and the second valve seat valve 6 on the valve seat 1 and are mounted on the valve seat 1, so that the first spool 23 is tightly fitted with the first valve 5 of the valve seat 1, the second spool 24 mounted on the fifth section 215 of the center rod 21 is tightly fitted with the second valve seat valve 6 of the valve seat 1, a fitting gap between the first spool 23 and the second valve seat valve 6 is adjusted, the leakage amount of oil is measured, and laser welding is performed between the fifth section 215 of the center rod 21 and the second spool 24 after the oil is qualified, so that the second spool 24 is fixedly mounted on the fifth section 215 of the center rod 21.

Compared with the prior art, the EGR valve double-valve-core central rod structure provided by the invention has the following advantages:

the assembly process adopts a bottom-up assembly mode, so that the problem that the leakage rate of the double-valve-seat valve is difficult to ensure is effectively solved;

the material of the central rod is stainless steel 316, so that the problem that the structure of the central rod of the valve core is unstable at high temperature is solved, the corrosion resistance is improved, and the service life of the EGR valve is prolonged;

the fourth section of the central rod effectively improves the elasticity, so that the sealing performance between the second valve core and the valve of the second valve seat of the valve seat is better in the working process of the valve;

the design of the fifth section of the central rod solves the risk of the double-valve-core hot-end valve in the desoldering process at high temperature;

the first valve core and the second valve core adopt a material reducing structure, so that the elasticity is increased, and meanwhile, the weight and the cost are reduced.

Through the structural improvement, the product percent of pass of the valve is improved, and the service life is prolonged.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.