Anti-corrosion structure of exhaust gas recirculation valve, exhaust gas recirculation valve and motor vehicle

Abstract

The anti-corrosion structure comprises a valve body, a valve shaft, a bearing, a sealing piece and a lining, the valve body is provided with a containing hole and an exhaust gas channel communicated with the containing hole, the valve shaft is arranged in the containing hole, the bearing is arranged in the exhaust gas channel, and the exhaust gas channel is communicated with the bearing. The bearing is arranged on the outer surface of the valve shaft in a sleeving mode and located between the valve shaft and the containing hole, the bush is arranged between the bearing and the containing hole, and the sealing piece is arranged between the bearing and the valve shaft and located at the end, close to the waste gas channel, of the bearing. The bearing is arranged between the bushing and the valve shaft, so that the bushing is prevented from being damaged by long-term rotation of the valve shaft, the service lives of the bushing and the valve shaft are prolonged, the valve body is prevented from being corroded by condensed water, the anti-corrosion effect is improved, and the service life of the valve shaft is prolonged. And the sealing piece can prevent condensed water from flowing into the valve body through the interior of the bearing to corrode the valve body.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to an anti-corrosion structure of an exhaust gas recirculation valve, an exhaust gas recirculation valve and a motor vehicle. Background Art

[0002] In the exhaust gas recirculation (EGR) valve, in the area where the exhaust gas channel is connected to the valve body, since the valve body temperature is relatively low, when the high-temperature exhaust gas enters the exhaust gas channel, acidic condensed water will be generated in this area, thereby corroding this area. At the same time, the contact between the valve shaft and the housing will also cause the valve body to wear due to the long-term rotation of the valve shaft.

[0003] Patent CN214499259U discloses that a bushing is arranged between the valve shaft and the housing. The effective sealing of the bushing can prevent condensed water from flowing into the valve body and corroding the valve body. At the same time, the bushing can prevent the valve shaft from contacting the housing, thereby preventing valve body wear caused by long-term rotation of the valve shaft. However, the valve shaft will come into contact with the bushing during the long-term rotation, thereby damaging the bushing, and allowing condensed water to flow into the valve body from the damaged part of the bushing and corrode the valve body. Therefore, its anti-corrosion performance is poor. Utility Model Content

[0004] The utility model aims to provide an anti-corrosion structure of an exhaust gas recirculation valve, an exhaust gas recirculation valve and a motor vehicle, aiming to solve the problems of poor anti-corrosion performance of the existing exhaust gas recirculation valve.

[0005] An embodiment of the utility model provides an anti-corrosion structure of an exhaust gas recirculation valve, including: a valve body, a valve shaft, a bearing, a sealing member and a bushing, wherein the valve body is provided with a receiving hole and an exhaust gas passage connected to the receiving hole, the valve shaft is arranged in the receiving hole, the bearing sleeve is arranged on the outer surface of the valve shaft and is located between the valve shaft and the receiving hole, the bushing is arranged between the bearing and the receiving hole, and the sealing member is arranged between the bearing and the valve shaft and is located on one end of the bearing close to the exhaust gas passage.

[0006] Furthermore, the bushing includes: a receiving hole bushing and an exhaust gas channel bushing fixedly connected to the receiving hole bushing, the receiving hole bushing is arranged in the receiving hole, and the exhaust gas channel bushing is arranged in the exhaust gas channel.

[0007] Furthermore, the length of the exhaust gas channel bushing is greater than or equal to the length of the exhaust gas channel.

[0008] Further, the accommodating hole includes: an upper accommodating hole and a lower accommodating hole, at least two bearings are provided, at least two seals are provided, two accommodating hole bushings are provided, the valve shaft is provided in the upper accommodating hole and the lower accommodating hole, at least two bearings are provided in the upper accommodating hole and the lower accommodating hole, at least two seals are provided in the upper accommodating hole and the lower accommodating hole, one of the accommodating hole bushings is provided between the bearing and the upper accommodating hole, and the other accommodating hole bushing is provided between the bearing and the lower accommodating hole.

[0009] Furthermore, a plurality of the sealing members are provided, and the plurality of the sealing members are provided between the bearing and the valve shaft and are located on one end of the bearing close to the exhaust gas passage.

[0010] Furthermore, the bushing is interference fit with the accommodating hole, and the bushing is interference fit with the bearing.

[0011] Furthermore, the bushing is a stainless steel bushing.

[0012] Furthermore, it also includes: a limit member for limiting the movement of the bearing away from the exhaust gas channel, the limit member is sleeved on the valve shaft and is located on the side of the end of the bearing away from the exhaust gas channel, and the bushing is provided with a limit structure for limiting the movement of the bearing toward the exhaust gas channel.

[0013] The embodiment of the utility model further provides an exhaust gas recirculation valve, comprising: the above-mentioned anti-corrosion structure of the exhaust gas recirculation valve.

[0014] An embodiment of the utility model further provides a motor vehicle, comprising: the above-mentioned exhaust gas recirculation valve.

[0015] The utility model discloses an anti-corrosion structure of an exhaust gas recirculation valve, an exhaust gas recirculation valve and a motor vehicle, the anti-corrosion structure comprising: a valve body, a valve shaft, a bearing, a sealing member and a bushing, the valve body being provided with a receiving hole and an exhaust gas passage communicating with the receiving hole, the valve shaft being arranged in the receiving hole, the bearing sleeve being arranged on the outer surface of the valve shaft and being located between the valve shaft and the receiving hole, the bushing being arranged between the bearing and the receiving hole, the sealing member being arranged between the bearing and the valve shaft and being located on one end of the bearing close to the exhaust gas passage. The utility model avoids damage to the bushing caused by long-term rotation of the valve shaft by arranging a bearing between the bushing and the valve shaft, thereby prolonging the service life of the bushing and the valve shaft, and at the same time avoiding corrosion of the valve body by condensed water, thereby improving the anti-corrosion effect, and the sealing member can prevent condensed water from flowing into the valve body through the inside of the bearing and thus corroding the valve body, and the sealing member can also prevent condensed water from flowing into the inside of the bearing and corroding the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 is a schematic diagram of the structure of an exhaust gas recirculation valve;

[0018] Figure 2 An exploded view of an exhaust gas recirculation valve;

[0019] Figure 3 It is a schematic diagram of the structure between the valve shaft, bearing and bushing;

[0020] Figure 4 for Figure 3 Exploded diagram of

[0021] Figure 5 is a cross-sectional schematic diagram of an exhaust gas recirculation valve;

[0022] Figure 6 for Figure 5 Partial diagram of A in the middle;

[0023] Figure 7 is a schematic diagram of the structure of the bushing;

[0024] Figure 8 is another structural schematic diagram of an exhaust gas recirculation valve;

[0025] Fig. 9 It is a structural schematic diagram of the EGR system;

[0026] Description of the markings in the figure:

[0027] 1. Valve body; 2. Valve shaft; 3. Bearing; 4. Seal; 5. Bushing; 6. Receiving hole; 7. Exhaust channel; 8. Receiving hole bushing; 9. Exhaust channel bushing; 10. Valve plate; 11. Upper receiving hole; 12. Lower receiving hole; 13. Limiting member; 14. Limiting structure; 15. Gasket; 16. Motor; 17. Gear transmission system; 18. Position sensor; 19. Catalyst; 20. EGR cooler; 21. EGR valve; 22. Air filter; 23. Supercharger; 24. Intercooler; 25. Throttle; 26. Combustion chamber. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0030] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in this utility model specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0031] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0032] See also Figure 1-6 The utility model provides an anti-corrosion structure of an exhaust gas recirculation valve, including: a valve body 1, a valve shaft 2, a bearing 3, a sealing member 4 and a bushing 5. The valve body 1 is provided with a receiving hole 6 and an exhaust gas passage 7 connected with the receiving hole 6. The valve shaft 2 is arranged in the receiving hole 6. The bearing 3 is sleeved on the outer surface of the valve shaft 2 and is located between the valve shaft 2 and the receiving hole 6. The bushing 5 is arranged between the bearing 3 and the receiving hole 6. The sealing member 4 is arranged between the bearing 3 and the valve shaft 2 and is located at one end of the bearing 3 close to the exhaust gas passage 7.

[0033] This embodiment avoids damage to the bushing 5 caused by long-term rotation of the valve shaft 2 by setting a bearing 3 between the bushing 5 and the valve shaft 2, thereby improving the service life of the bushing 5 and the valve shaft 2, and at the same time avoids corrosion of the valve body 1 by condensed water, thereby improving the anti-corrosion effect. The seal 4 can prevent condensed water from flowing into the valve body 1 through the inside of the bearing 3 and causing corrosion to the valve body 1. The seal 4 can also prevent condensed water from flowing into the inside of the bearing 3 and causing corrosion to the bearing 3.

[0034] In this embodiment, please refer to Figure 7The bushing 5 includes: a receiving hole bushing 8 and an exhaust gas channel bushing 9 fixedly connected to the receiving hole bushing 8 . The receiving hole bushing 8 is arranged in the receiving hole 6 , and the exhaust gas channel bushing 9 is arranged in the exhaust gas channel 7 .

[0035] Among them, the receiving hole bushing 8 and the exhaust gas channel bushing 9 are integrated. The integrated setting can protect the inner walls of the receiving hole 6 and the exhaust gas channel 7 at the same time, realize more comprehensive protection of the valve body 1, and improve the service life of the valve body 1; the integrated setting can also ensure that the valve plate 10 on the valve shaft 2 can never contact the valve body 1, thereby avoiding the wear of the valve body 1 caused by the rotation of the valve plate 10.

[0036] In some embodiments, the length of the exhaust channel bushing 9 is greater than or equal to the length of the exhaust channel 7, so that the exhaust channel bushing 9 can fully cover the entire exhaust channel 7, thereby fully preventing condensed water from corroding the exhaust channel 7 and causing damage to the valve body 1. Similarly, the length of the receiving hole bushing 8 may also be greater than or equal to the length of the receiving hole 6.

[0037] In this embodiment, please refer to Figure 5 and Figure 6 The accommodating hole 6 includes: an upper accommodating hole 11 and a lower accommodating hole 12, at least two bearings 3 are provided, at least two seals 4 are provided, and two accommodating hole bushings 8 are provided. The valve shaft 2 is arranged in the upper accommodating hole 11 and the lower accommodating hole 12, at least two bearings 3 are respectively arranged in the upper accommodating hole 11 and the lower accommodating hole 12, at least two seals 4 are respectively arranged in the upper accommodating hole 11 and the lower accommodating hole 12, one of the accommodating hole bushings 8 is arranged between the bearing 3 and the upper accommodating hole 11, and the other accommodating hole bushing 8 is arranged between the bearing 3 and the lower accommodating hole 12.

[0038] Among them, since the accommodating hole 6 and the exhaust gas channel 7 are cross-arranged, the accommodating hole 6 is divided into an upper accommodating hole 11 and a lower accommodating hole 12. In order to ensure the anti-corrosion effect of the entire exhaust gas recirculation valve, the upper accommodating hole 11 and the lower accommodating hole 12 are required to be provided with corresponding anti-corrosion structures. Therefore, in this embodiment, a accommodating hole bushing 8 is provided in the upper accommodating hole 11 and the lower accommodating hole 12, and a bearing 3 is provided between the accommodating hole bushing 8 and the valve shaft 2 to ensure that the valve shaft 2 cannot contact the accommodating hole bushing 8, thereby causing wear to the accommodating hole bushing 8. At the same time, the setting of the two bearings 3 can also ensure the smooth rotation of the valve shaft 2, thereby ensuring the normal operation of the exhaust gas recirculation valve.

[0039] In this embodiment, a plurality of sealing members 4 are provided, and the plurality of sealing members 4 are provided between the bearing 3 and the valve shaft 2 and are located on one end of the bearing 3 close to the exhaust gas passage 7 .

[0040] The multiple seals 4 can ensure that after one of the seals 4 is damaged, the other seals 4 can still prevent condensed water from entering the interior of the bearing 3 , thereby greatly enhancing the sealing performance inside the bearing 3 .

[0041] In this embodiment, a seal 4 is also provided on the end of the bearing 3 away from the exhaust gas channel 7. The setting of the seal 4 can ensure that after the condensed water flows into the interior of the bearing 3, it cannot enter the valve body 1 from the interior of the bearing 3, thereby further improving the anti-corrosion performance of the valve body 1.

[0042] The sealing member 4 can be an O-ring, a packing, a dust ring, etc. In addition, the material of the sealing member 4 includes rubber, silicone, polyurethane, fluororubber, etc. These materials can adapt to different working conditions while ensuring the sealing performance.

[0043] In this embodiment, the bushing 5 and the receiving hole 6 are interference fit, and the bushing 5 and the bearing 3 are interference fit.

[0044] The interference fit between the bushing 5 and the accommodating hole 6 and the interference fit between the bushing 5 and the bearing 3 can, on the one hand, fix the bearing 3 and prevent the bearing 3 from rotating with the rotation of the valve shaft 2, thereby preventing the bearing 3 from rotating and causing damage to the bushing 5; on the other hand, the interference fit can prevent condensed water from entering the gap between the valve body 1, the bushing 5 and the bearing 3, thereby preventing the condensed water from damaging the valve body 1.

[0045] In this embodiment, the bushing 5 can be an engineering plastic bushing or a stainless steel bushing. Preferably, the bushing is a stainless steel bushing. The stainless steel bushing has excellent corrosion resistance, especially in high temperature and humid environments, and can resist corrosive substances in exhaust gas to ensure the long-term stable operation of the EGR valve; the stainless steel bushing also has high strength and wear resistance, and can withstand the mechanical stress and friction generated by the EGR valve during operation; in addition, the surface of the stainless steel bushing is smooth and not easy to accumulate dirt and carbon deposits, making the cleaning and maintenance of the EGR valve easier and more convenient.

[0046] In this embodiment, the invention further comprises a limiting member 13 (such as a limiting member 13) for limiting the movement of the bearing 3 away from the exhaust passage 7. Figure 3 and Figure 4 As shown), the limiting member 13 is sleeved on the valve shaft 2 and is located on the side of the end of the bearing 3 away from the exhaust gas channel 7, and the bushing 5 is provided with a limiting structure 14 (as shown) that limits the movement of the bearing 3 toward the exhaust gas channel 7 Figure 6 and Figure 7 shown).

[0047] The arrangement of the limiting member 13 and the limiting structure 14 can limit the up and down movement of the bearing 3, so as to fix the bearing 3, wherein the limiting structure 14 can be a convex block structure.

[0048] The limiting member 13 may be a C-shaped claw, which is clamped on the valve shaft 2 and located on the side of the end of the bearing 3 away from the exhaust gas channel 7, thereby limiting the bearing 3.

[0049] Furthermore, this embodiment also provides a gasket 15 (such as Figure 3 and Figure 4 As shown in the figure, the gasket 15 is sleeved on the valve shaft 2 and arranged between the limit member 13 and the bearing 3. The setting of the gasket 15 can increase the action area of ​​the limit member 13 on the bearing 3, thereby improving the fixing effect and reducing the possibility of loosening and vibration; on the other hand, the limit member 13 will rotate with the rotation of the valve shaft 2, so the gasket 15 can also serve as a wear-resistant layer to prevent direct contact between the limit member 13 and the bearing 3, thereby reducing the wear of the limit member 13 on the bearing 3.

[0050] This embodiment also provides an exhaust gas recirculation valve, including: the anti-corrosion structure of the exhaust gas recirculation valve as described in the above embodiment.

[0051] See also Figure 8 The exhaust gas recirculation valve works as follows: the motor 16 drives the gear transmission system 17, and then the required position is fed back through the position sensor 18, and then the valve shaft 2 is controlled according to the position to drive the valve plate 10 to reach the target position.

[0052] This embodiment also provides a motor vehicle, comprising: an exhaust gas recirculation valve as described in the above embodiment.

[0053] See also Fig. 9 The basic steps of the EGR system in a motor vehicle are as follows: after the exhaust gas passes through the catalyst 19, part of the exhaust gas will be cooled by the EGR cooler 20, and then the exhaust gas flow rate will be adjusted by the EGR valve 21. Then the exhaust gas will be mixed with the fresh air filtered by the air filter 22 at the compression end of the supercharger 23. After being compressed by the supercharger 23, the gas temperature rises, and then the mixed gas is cooled by the intercooler 24. Then, the amount of the mixed gas entering the combustion chamber 26 is controlled by adjusting the opening of the throttle valve 25.

[0054] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0055] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive.

[0056] Inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "including a..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. An anti-corrosion structure of an exhaust gas recirculation valve, characterized in that: include: A valve body, a valve shaft, a bearing, a seal and a bushing, wherein the valve body is provided with a receiving hole and an exhaust gas passage connected to the receiving hole, the valve shaft is arranged in the receiving hole, the bearing sleeve is arranged on the outer surface of the valve shaft and is located between the valve shaft and the receiving hole, the bushing is arranged between the bearing and the receiving hole, and the seal is arranged between the bearing and the valve shaft and is located on one end of the bearing close to the exhaust gas passage.

2. The anti-corrosion structure of the exhaust gas recirculation valve according to claim 1, characterized in that: The bushing includes: a receiving hole bushing and an exhaust gas channel bushing fixedly connected to the receiving hole bushing, the receiving hole bushing is arranged in the receiving hole, and the exhaust gas channel bushing is arranged in the exhaust gas channel.

3. The anti-corrosion structure of the exhaust gas recirculation valve according to claim 2, characterized in that: The length of the exhaust passage liner is greater than or equal to the length of the exhaust passage.

4. The anti-corrosion structure of the exhaust gas recirculation valve according to claim 2, characterized in that: The accommodating hole includes: an upper accommodating hole and a lower accommodating hole, at least two bearings are provided, at least two seals are provided, two accommodating hole bushings are provided, the valve shaft is provided in the upper accommodating hole and the lower accommodating hole, at least two bearings are provided in the upper accommodating hole and the lower accommodating hole respectively, at least two seals are provided in the upper accommodating hole and the lower accommodating hole respectively, one of the accommodating hole bushings is provided between the bearing and the upper accommodating hole, and the other accommodating hole bushing is provided between the bearing and the lower accommodating hole.

5. The anti-corrosion structure of the exhaust gas recirculation valve according to claim 1, characterized in that: A plurality of sealing members are provided, and the plurality of sealing members are provided between the bearing and the valve shaft and are located on one end of the bearing close to the exhaust passage.

6. The anti-corrosion structure of the exhaust gas recirculation valve according to claim 1, characterized in that: The bushing is interference fit with the receiving hole, and the bushing is interference fit with the bearing.

7. The anti-corrosion structure of the exhaust gas recirculation valve according to claim 1, characterized in that: The bushing is a stainless steel bushing.

8. The anti-corrosion structure of the exhaust gas recirculation valve according to claim 1, characterized in that: Also includes: A limit member is used to limit the movement of the bearing away from the exhaust gas channel. The limit member is sleeved on the valve shaft and located on the side of one end of the bearing away from the exhaust gas channel. The bushing is provided with a limit structure for limiting the movement of the bearing toward the exhaust gas channel.

9. An exhaust gas recirculation valve, characterized in that: include: An anti-corrosion structure for an exhaust gas recirculation valve as claimed in any one of claims 1 to 8.

10. A motor vehicle, characterized in that: include: An exhaust gas recirculation valve as claimed in claim 9.

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