Anti-corrosion structure for exhaust gas recirculation (EGR) valve and EGR valve

Abstract

The utility model discloses an anti-corrosion structure for an exhaust gas recirculation (EGR) valve and the EGR valve, the anti-corrosion structure comprises a bushing, the bushing is cylindrical, an airflow channel is arranged in the bushing, the airflow channel penetrates through the bushing, and two ends of the bushing are respectively provided with a flange; a valve clack containing cavity is formed in the airflow channel, valve rod channels are formed in the top and the bottom of the valve clack containing cavity respectively, the valve rod channels penetrate through the side wall of the lining, and a protruding edge is arranged at the end, facing the outside of the lining, of each valve rod channel. The EGR valve has the advantages that the bushing isolates the valve body from waste gas, so that the valve body is prevented from being corroded by the waste gas, the clamping stagnation fault of the EGR valve caused by corrosives generated by corrosion of the valve body is avoided, and the service life of the EGR valve can be greatly prolonged; according to the EGR valve, the flange is adopted as the sealing surface, when condensate water containing chloride ions and sulfur ions gathers at the flange, the condensate water is in contact with the corrosion-resistant lining, and the problems of sealing failure and EGR valve clamping stagnation caused by corrosive accumulation due to the fact that the end face of the flange is made of aluminum alloy materials and is corroded are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of EGR valves, in particular to an anti-corrosion structure for an exhaust gas recirculation EGR valve, and an EGR valve with the anti-corrosion structure. Background Art

[0002] In the engine exhaust gas recirculation system, the gasoline engine EGR valve is mainly used to adjust and control the flow of recirculated exhaust gas. The gasoline engine EGR valve controls the opening of the air intake through the internal DC motor, sensor and actuator to adjust the exhaust gas flow of the engine, so that the exhaust gas containing a large amount of unburnable CO and CO2 is mixed with fresh air in a certain proportion and then returned to the cylinder for recirculation, thereby reducing the combustion temperature and combustion speed in the cylinder and further reducing NO x emissions, reducing air pollution.

[0003] Current gasoline engine EGR valve bodies utilize aluminum alloy. When chloride and sulfur ions in exhaust gas dissolve in condensed water in the flow path, the condensed water corrodes the aluminum alloy. As the corrosion products accumulate, they accumulate on the valve disc, causing it to loosen or increase opening resistance. In extreme cases, the disc cannot open, leading to EGR valve sticking. Corrosive materials entering the bearings can cause abnormal bearing wear, valve stem seizure, and seal failure, shortening the service life of the bearings and valve stem, and ultimately reducing the life of the EGR valve.

[0004] When condensed water containing chloride ions and sulfur ions accumulates on the flange end face, the condensate will corrode the aluminum alloy of the sealing surface. In severe cases, it will corrode through the sealing surface, causing the flange seal to fail and the EGR valve to malfunction. Utility Model Content

[0005] To this end, the utility model provides an anti-corrosion structure for an exhaust gas recirculation (EGR) valve and an EGR valve to solve the above-mentioned problems in the prior art.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] According to a first aspect of the present invention, an anti-corrosion structure for an exhaust gas recirculation (EGR) valve includes a bushing, wherein the bushing is cylindrical and has an air flow passage therein. The air flow passage passes through the bushing, and flanges are provided at both ends of the bushing.

[0008] A valve flap accommodating cavity is provided in the air flow channel, and valve stem channels are respectively provided at the top and bottom of the valve flap accommodating cavity. The valve stem channels penetrate the side wall of the bushing, and a convex edge is provided at one end of the valve stem channel facing the outside of the bushing.

[0009] Furthermore, the convex edge is in a circular ring shape, and a bearing positioning platform is provided inside the convex edge.

[0010] Furthermore, the bearing positioning platform is an annular boss.

[0011] Furthermore, the bushing is cylindrical, and the air flow channel is arranged along the axis of the bushing.

[0012] Furthermore, the flange is in a circular ring shape and is arranged along the radial direction of the bushing.

[0013] Furthermore, the bushing, the flange and the protrusion are an integrated structure.

[0014] Furthermore, the bushing, the flange and the ridge are all made of corrosion-resistant materials.

[0015] The utility model has the following advantages: after the entire bushing is embedded in the EGR valve body, the bushing isolates the valve body from the exhaust gas, thereby preventing the exhaust gas from corroding the valve body, avoiding the EGR valve from being stuck due to corrosion products generated by valve body corrosion, and greatly extending the service life of the EGR valve; both ends of the bushing are provided with flanges, and the flanges are used as sealing surfaces. When condensed water containing chloride ions and sulfur ions gathers at the flange, the condensed liquid contacts the corrosion-resistant bushing, avoiding the problem of sealing failure caused by the corrosion of the flange end face made of aluminum alloy and the EGR valve being stuck due to the accumulation of corrosion products.

[0016] According to a second aspect of the present invention, the anti-corrosion structure for an exhaust gas recirculation (EGR) valve described in the first aspect is adopted. The EGR valve with the anti-corrosion structure further includes a valve body, a valve stem, an upper cover, a valve disc, and a drive mechanism. The bushing is embedded in the valve cavity of the valve body, and the upper cover is arranged on the top of the valve body.

[0017] The valve stem is rotatably disposed in the valve body, and the valve stem passes through the bushing along the valve stem channel;

[0018] The valve disc is mounted on the valve stem, and the valve disc is located in the valve disc accommodating cavity;

[0019] The driving mechanism is disposed in the valve body and is in transmission connection with the valve stem.

[0020] Furthermore, the driving mechanism includes a motor, a driving gear and a double gear, the motor is embedded in the valve body, and the driving gear is arranged on the output shaft of the motor;

[0021] The double gear is rotatably arranged between the valve body and the upper cover, the valve stem is provided with a sector gear, the double gear is respectively engaged with the driving gear and the sector gear, and a torsion spring is provided between the sector gear and the valve body;

[0022] Two needle bearings are provided on the valve stem. The two needle bearings are respectively located on the upper side and the lower side of the bushing, and the two needle bearings are respectively in contact with corresponding bearing positioning platforms.

[0023] Furthermore, it also includes a sensor and a magnet, the sensor is arranged above the sector gear, and the magnet is installed on the sector gear.

[0024] The utility model has the following advantages: a bushing is provided in the valve body, which isolates the valve body from the exhaust gas, thereby preventing the exhaust gas from corroding the valve body, avoiding the EGR valve from being stuck and causing corrosion products due to valve body corrosion, and greatly extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely illustrative, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0026] The structures, proportions, sizes, etc. illustrated in this specification are intended solely to complement the contents disclosed herein and to facilitate understanding and reading by persons skilled in the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in size, provided they do not affect the efficacy and objectives of the present invention, shall remain within the scope of the technical contents disclosed herein.

[0027] Figure 1 A first perspective view of an anti-corrosion structure for an exhaust gas recirculation (EGR) valve provided in some embodiments of the present invention.

[0028] Figure 2 A second perspective view of an anti-corrosion structure for an exhaust gas recirculation (EGR) valve provided in some embodiments of the present invention.

[0029] Figure 3 A front view of an anti-corrosion structure for an exhaust gas recirculation (EGR) valve provided in some embodiments of the present invention.

[0030] Figure 4 This is a left side view of an anti-corrosion structure for an exhaust gas recirculation (EGR) valve provided in some embodiments of the present invention.

[0031] Figure 5A cross-sectional view of an anti-corrosion structure for an exhaust gas recirculation (EGR) valve provided in some embodiments of the present invention along its axis.

[0032] Figure 6 A cross-sectional view along the radial direction of an anti-corrosion structure for an exhaust gas recirculation (EGR) valve provided in some embodiments of the present invention.

[0033] Figure 7 A cross-sectional view along the axial direction of an air flow channel of an EGR valve with an anti-corrosion structure provided in some embodiments of the present invention.

[0034] Figure 8 A cross-sectional view along the radial direction of an air flow passage of an EGR valve with an anti-corrosion structure provided in some embodiments of the present invention.

[0035] In the figure: 1. Bushing, 2. Air flow channel, 3. Flanged edge, 4. Raised edge, 5. Bearing positioning platform, 6. Valve disc accommodating chamber, 7. Valve body, 8. Valve stem, 9. Screw, 10. Washer, 11. Circlip, 12. Plug, 13. Wave spring, 14. Motor, 15. Flange, 16. Sealing ring, 17. Drive gear, 18. Duplex gear, 19. Gear shaft, 20. Upper cover, 21. Sensor, 22. Sector gear, 23. Magnet, 24. Torsion spring, 25. Needle roller bearing, 26. Valve disc. DETAILED DESCRIPTION

[0036] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can readily understand the other advantages and benefits of the present invention from the contents disclosed in this specification. Obviously, the embodiments described are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0037] Example 1

[0038] like Figures 1 to 6 As shown, an anti-corrosion structure for an exhaust gas recirculation (EGR) valve in an embodiment of the first aspect of the present invention includes a bushing 1, which is cylindrical and has an air flow channel 2 therein. The air flow channel 2 is arranged along the axis of the bushing 1 and passes through the bushing 1. Flanges 3 are respectively provided at both ends of the bushing 1. The flanges 3 are annular and are arranged along the radial direction of the bushing 1.

[0039] A valve disc accommodating chamber 6 is provided in the air flow channel 2. A valve stem channel is provided at the top and bottom of the valve disc accommodating chamber 6. The valve stem channel passes through the side wall of the bushing 1. A convex edge 4 is provided at one end of the valve stem channel facing the outside of the bushing 1.

[0040] The bushing 1 , the flange 3 and the convex edge 4 are an integrated structure, and the bushing 1 , the flange 3 and the convex edge 4 are all made of corrosion-resistant materials. Specifically, the bushing 1 , the flange 3 and the convex edge 4 are all made of stainless steel.

[0041] In this embodiment, it should be noted that the convex edge 4 is annular, and a bearing positioning platform 5 is provided inside the convex edge 4. The bearing positioning platform 5 is an annular boss and is used to position and install the bearing on the valve stem.

[0042] The technical effect achieved by this embodiment is as follows: the bushing 1 is placed in the valve body as a lining, serving as the flow channel and flange sealing surface of the EGR valve. The bushing 1 isolates the valve body from the exhaust gas, thereby preventing the exhaust gas from corroding the valve body, avoiding the EGR valve from being stuck due to corrosion products generated by valve body corrosion, and greatly extending the service life of the EGR valve; flanges 3 are respectively provided at both ends of the bushing 1, and the flanges 3 are used as sealing surfaces. When condensed water containing chloride ions and sulfur ions gathers at the flange, the condensate contacts the corrosion-resistant bushing 1, avoiding the sealing failure caused by the corrosion of the flange end face made of aluminum alloy and the EGR valve sticking problem caused by the accumulation of corrosion products.

[0043] Example 2

[0044] like Figure 7 and Figure 8 As shown, an EGR valve with an anti-corrosion structure in an embodiment of the second aspect of the present invention adopts the anti-corrosion structure in the embodiment of the first aspect, and further includes a valve body 7, a valve stem 8, an upper cover 20, a valve disc 26 and a drive mechanism. The bushing 1 is embedded in the valve cavity of the valve body 7. Specifically, the bushing 1 is formed by an investment casting process, and the bushing 1 and the valve body 7 are integrally die-casted. After the bushing 1 and the valve body 7 are die-casted, they are machined as a whole to the final size. The upper cover 20 is arranged on the top of the valve body 7, and a sealing ring 16 is provided between the upper cover 20 and the valve body 7.

[0045] The valve stem 8 is rotatably arranged in the valve body 7, and the valve stem 8 passes through the bushing 1 along the valve stem channel. The bottom end of the valve stem is provided with a washer 10 and a retaining spring 11. The washer 10 is sleeved on the valve stem 8, and the retaining spring 11 is used to limit the position of the washer 10. The valve body 7 is provided with a plug 12, which is used to block the mounting hole at the bottom end of the valve stem 8;

[0046] The valve disc 26 is mounted on the valve stem 8 by means of screws 9, and the valve disc 26 is located in the valve disc accommodating cavity 6;

[0047] The driving mechanism is arranged in the valve body 7 and is transmission-connected to the valve stem 8 .

[0048] In this embodiment, it should be noted that the drive mechanism includes a motor 14, a drive gear 17, and a double gear 18. The motor 14 is vertically embedded in the valve body 7. A wave spring 13 is provided at the bottom of the motor 14 to prevent the rotor of the motor 14 from axial displacement under engine vibration conditions. A flange 15 is provided at the top of the motor 14 for mounting and fixing the motor 14. The drive gear 17 is provided on the output shaft of the motor 14.

[0049] The double gear 18 is rotatably arranged between the valve body 7 and the upper cover 20 via the gear shaft 19. A sector gear 22 is provided on the valve stem 8. The double gear 18 meshes with the drive gear 17 and the sector gear 22 respectively. Specifically, the large gear of the double gear 18 meshes with the drive gear, and the small gear of the double gear 18 meshes with the sector gear 17. A torsion spring 24 is provided between the sector gear 22 and the valve body 7. The torsion spring 24 is used to control the reset of the sector gear 22.

[0050] Two needle bearings 25 are provided on the valve stem 8 . The two needle bearings 25 are respectively located on the upper side and the lower side of the bushing 1 , and the two needle bearings 25 are respectively in contact with the corresponding bearing positioning platforms 5 .

[0051] Furthermore, it also includes a sensor 21 and a magnet 23. The sensor 21 is arranged above the sector gear 22, and the magnet 23 is installed on the end face of the sector gear 22. During use, as the sector gear 22 rotates, the position of the magnet 23 will move. When the sector gear 22 rotates, it drives the valve stem 8 and the valve flap 26 to rotate, thereby controlling the opening and closing of the EGR valve. The sensor 21 identifies the opening and closing state of the EGR valve by identifying the position of the magnet 23.

[0052] The technical effect achieved by this embodiment is that the valve body 7 is provided with the bushing 1, ensuring that the flow channel and exhaust gas contact areas are all made of corrosion-resistant stainless steel, with no exposed aluminum alloy. Therefore, when condensed water containing chloride and sulfur ions accumulates in the flow channel, it comes into contact with the corrosion-resistant stainless steel, thus preventing problems such as EGR valve seizure due to corrosion and valve stem seal failure, effectively extending its service life.

[0053] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications or improvements may be made to the present invention. Therefore, such modifications or improvements, without departing from the spirit of the present invention, are within the scope of protection claimed herein.

[0054] The terms "upper", "lower", "left", "right", "middle", etc. used in this specification are only for the convenience of description and are not intended to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be considered as the scope of implementation of the present invention without substantially changing the technical content.

Claims

1. An anti-corrosion structure for an exhaust gas recirculation (EGR) valve, characterized in that: The invention comprises a bushing (1), wherein the bushing (1) is cylindrical, an air flow channel (2) is provided in the bushing (1), the air flow channel (2) passes through the bushing (1), and flanges (3) are provided at both ends of the bushing (1); A valve flap accommodating chamber (6) is provided in the air flow channel (2), and valve stem channels are respectively provided at the top and bottom of the valve flap accommodating chamber (6). The valve stem channels penetrate the side wall of the bushing (1), and a convex edge (4) is provided at one end of the valve stem channel facing the outside of the bushing (1).

2. The anti-corrosion structure for an exhaust gas recirculation (EGR) valve according to claim 1, characterized in that: The convex edge (4) is in the shape of a circular ring, and a bearing positioning platform (5) is provided inside the convex edge (4).

3. The anti-corrosion structure for an exhaust gas recirculation (EGR) valve according to claim 2, characterized in that: The bearing positioning platform (5) is an annular boss.

4. The anti-corrosion structure for an exhaust gas recirculation (EGR) valve according to claim 1, characterized in that: The bushing (1) is cylindrical, and the air flow channel (2) is arranged along the axis of the bushing (1).

5. The anti-corrosion structure for an exhaust gas recirculation (EGR) valve according to claim 4, characterized in that: The flange (3) is in the shape of a circular ring and is arranged along the radial direction of the bushing (1).

6. The anti-corrosion structure for an exhaust gas recirculation (EGR) valve according to claim 1, characterized in that: The bushing (1), the flange (3) and the ledge (4) are an integrated structure.

7. The anti-corrosion structure for an exhaust gas recirculation (EGR) valve according to claim 6, characterized in that: The bushing (1), the flange (3) and the ledge (4) are all made of corrosion-resistant materials.

8. An EGR valve with an anti-corrosion structure, adopting the anti-corrosion structure for an exhaust gas recirculation EGR valve according to any one of claims 1 to 7, characterized in that: It also includes a valve body (7), a valve stem (8), an upper cover (20), a valve flap (26) and a driving mechanism, wherein the bushing (1) is embedded in the valve cavity of the valve body (7), and the upper cover (20) is arranged on the top of the valve body (7); The valve stem (8) is rotatably disposed in the valve body (7), and the valve stem (8) passes through the bushing (1) along the valve stem channel; The valve flap (26) is mounted on the valve stem (8), and the valve flap (26) is located in the valve flap accommodating cavity (6); The driving mechanism is arranged in the valve body (7), and the driving mechanism is in transmission connection with the valve stem (8).

9. The EGR valve with an anti-corrosion structure according to claim 8, characterized in that: The driving mechanism comprises a motor (14), a driving gear (17) and a double gear (18); the motor (14) is embedded in the valve body (7); and the driving gear (17) is arranged on the output shaft of the motor (14); The double gear (18) is rotatably arranged between the valve body (7) and the upper cover (20), the valve stem (8) is provided with a sector gear (22), the double gear (18) is respectively engaged with the driving gear (17) and the sector gear (22), and a torsion spring (24) is provided between the sector gear (22) and the valve body (7); Two needle bearings (25) are provided on the valve stem (8), and the two needle bearings (25) are respectively located on the upper side and the lower side of the bushing (1), and the two needle bearings (25) are respectively in contact with the corresponding bearing positioning platforms (5).

10. The EGR valve with an anti-corrosion structure according to claim 9, characterized in that: The invention also comprises a sensor (21) and a magnet (23), wherein the sensor (21) is arranged above the sector gear (22), and the magnet (23) is mounted on the sector gear (22).

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