EGR (Exhaust Gas Recirculation) lift valve embedded anti-corrosion structure

Abstract

The embedded anti-corrosion structure of the EGR lifting valve comprises a first lining, a connecting sleeve and a second lining, one end of the first lining is connected with the connecting sleeve, and one end of the second lining is connected with one end of the connecting sleeve; an exhaust channel is formed in the first bushing, and a first flange is arranged at one end, deviating from the connecting sleeve, of the first bushing; an air inlet channel is formed in the second bush, a second flange is arranged at the end, away from the connecting sleeve, of the second bush, and a valve clack containing cavity is formed in the end, close to the connecting sleeve, of the second bush. The EGR valve has the advantages that the EGR valve is embedded in the valve body during use, it is guaranteed that the aluminum valve body does not make contact with waste gas, therefore, the waste gas is prevented from corroding the valve body, clamping stagnation or failure 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; and the gas inlet and the gas outlet adopt flanging design, so that the waste gas inlet and outlet are not contacted with the end surface of the aluminum valve body, the end surface sealing failure phenomenon caused by corrosion is avoided, and the service life of the EGR lift valve can be effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of EGR lift valves, in particular to an EGR lift valve embedded anti-corrosion structure. Background Art

[0002] The EGR poppet valve is a unit used in automotive gasoline engine exhaust gas recycling (EGR) systems to precisely control exhaust gas flow. Exhaust gas flows through the internal flow path of the EGR poppet valve, with flow controlled by the valve opening and closing. Because gasoline engine exhaust contains large amounts of corrosive gases, these gases, when flowing through the EGR poppet valve body airway, corrode the inner wall of the EGR poppet valve airway, generating impurities. These impurities, along with the reciprocating motion of the valve stem, can easily enter the mating surface between the seal guide mechanism and the valve stem, increasing wear or causing the valve stem to lock. This can lead to the EGR poppet valve becoming stuck or the valve stem guide seal malfunctioning. Flange end face corrosion can also cause flange face seal failure, resulting in air leakage. This not only affects EGR poppet valve performance, but also increases valve noise and reduces its lifespan. Utility Model Content

[0003] To this end, the utility model provides an EGR poppet valve embedded anti-corrosion structure to solve the above-mentioned problems in the prior art.

[0004] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0005] According to a first aspect of the present invention, an EGR poppet valve embedded anti-corrosion structure includes a first bushing, a connecting sleeve, and a second bushing, wherein one end of the first bushing is connected to the connecting sleeve, and one end of the second bushing is connected to one end of the connecting sleeve;

[0006] An exhaust passage is provided in the first bushing, and a first flange is provided at one end of the first bushing away from the connecting sleeve;

[0007] An air inlet passage is provided in the second bushing, a second flange is provided at one end of the second bushing away from the connecting sleeve, and a valve flap accommodating cavity is provided at one end of the second bushing close to the connecting sleeve.

[0008] Furthermore, the connecting sleeve and the second bushing are coaxial, and the first bushing is arranged in a direction perpendicular to the connecting sleeve.

[0009] Furthermore, the exhaust passage is arranged along the axis of the first bushing, the intake passage is arranged along the axis of the second bushing, and the intake passage and the exhaust passage are communicated with each other.

[0010] Furthermore, it also includes a valve ring, which is arranged in the valve disc accommodating cavity.

[0011] Furthermore, the valve ring and the second bushing are an integral structure.

[0012] Furthermore, the valve ring and the second bushing are separate structures.

[0013] Furthermore, the first bushing, the connecting sleeve and the second bushing are an integrated structure.

[0014] Furthermore, the first bushing, the connecting sleeve and the second bushing are all made of corrosion-resistant materials.

[0015] Furthermore, the first bushing, the connecting sleeve and the second bushing are all made of stainless steel.

[0016] Furthermore, the first bushing, the connecting sleeve and the second bushing are all cylindrical.

[0017] The utility model has the following advantages: the first bushing, the connecting sleeve and the second bushing are an integral whole, which are embedded in the valve body when in use, ensuring that the aluminum valve body has no contact with the exhaust gas, improving the corrosion resistance of the EGR poppet valve, thereby preventing the exhaust gas from corroding the valve body, avoiding the EGR valve from being stuck or failing due to corrosive substances generated by valve body corrosion, and greatly extending the service life of the EGR valve; the flanging design is adopted at the air inlet and outlet, which can ensure that the exhaust gas inlet and outlet have no contact with the end face of the aluminum valve body, avoiding the end face sealing failure caused by corrosion, and effectively extending the service life of the EGR poppet valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] 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.

[0020] Figure 1 A first perspective view of an EGR poppet valve embedded anti-corrosion structure provided in some embodiments of the present invention.

[0021] Figure 2A second perspective view of an EGR poppet valve embedded anti-corrosion structure provided in some embodiments of the present invention.

[0022] Figure 3 A front view of an EGR poppet valve embedded anti-corrosion structure provided in some embodiments of the present invention.

[0023] Figure 4 This is a schematic structural diagram of an EGR poppet valve with an embedded anti-corrosion structure after installation provided in some embodiments of the present invention.

[0024] Figure 5 This is a schematic structural diagram of another EGR poppet valve with an embedded anti-corrosion structure after installation provided in some embodiments of the present invention.

[0025] In the figure: 1. first bushing, 2. connecting sleeve, 3. second bushing, 4. first flange, 5. second flange, 6. exhaust channel, 7. intake channel, 8. valve disc accommodating chamber, 9. valve body, 10. valve stem, 11. valve disc, 12. valve ring. DETAILED DESCRIPTION

[0026] 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.

[0027] Example 1

[0028] like Figures 1 to 5 As shown, an EGR poppet valve embedded anti-corrosion structure in an embodiment of the first aspect of the present invention includes a first bushing 1, a connecting sleeve 2 and a second bushing 3, one end of the first bushing 1 is connected to the connecting sleeve 2, and one end of the second bushing 3 is connected to one end of the connecting sleeve 2;

[0029] An exhaust passage 6 is provided in the first bushing 1. A first flange 4 is provided at one end of the first bushing 1 away from the connecting sleeve 2. The first flange 4 is annular and arranged along the radial direction of the first bushing 1. The first flange 4 and the first bushing 1 are an integral structure.

[0030] An air intake channel 7 is provided in the second bushing 3, and a second flange 5 is provided at the end of the second bushing 3 facing away from the connecting sleeve 2. The second flange 5 is circular and arranged along the radial direction of the second bushing 3. The second flange 5 and the second bushing 3 are an integral structure. A valve flap accommodating cavity 8 is provided at the end of the second bushing 3 close to the connecting sleeve 2. The valve flap accommodating cavity 8 is used to accommodate a valve flap 11.

[0031] In this embodiment, it should be noted that the connecting sleeve 2 and the second bushing 3 are coaxial, and the first bushing 1 is arranged in a direction perpendicular to the connecting sleeve 2;

[0032] The exhaust channel 6 is arranged along the axis of the first bushing 1 , and the intake channel 7 is arranged along the axis of the second bushing 3 . The intake channel 7 and the exhaust channel 6 are communicated with each other.

[0033] Furthermore, the first bushing 1, the connecting sleeve 2, and the second bushing 3 are all cylindrical, and the first bushing 1, the connecting sleeve 2, and the second bushing 3 are an integral structure. The first bushing 1, the connecting sleeve 2, and the second bushing 3 together constitute an inner bushing. The specific structure of the inner bushing is processed and manufactured according to the internal structure of the valve body of the EGR poppet valve. The specific structure of the inner bushing is not limited to the structure described in this embodiment.

[0034] The inner sleeve is made of corrosion-resistant material. Specifically, the inner sleeve can be made of stainless steel, which has stronger corrosion resistance than the valve body structure of the ordinary aluminum cast EGR poppet valve.

[0035] The technical effects achieved by this embodiment are as follows: the first bushing 1, the connecting sleeve 2 and the second bushing 3 are a whole, which are embedded in the valve body 9 when in use, ensuring that the aluminum valve body has no contact with the exhaust gas, improving the corrosion resistance of the EGR lift valve, thereby preventing the exhaust gas from corroding the valve body 9, avoiding the corrosion products generated due to valve body corrosion that cause the EGR valve to become stuck or fail, and greatly extending the service life of the EGR valve; the flange design is adopted at the inlet and outlet to ensure that the exhaust gas inlet and outlet have no contact with the end face of the aluminum valve body, avoiding the end face sealing failure caused by corrosion, and effectively extending the service life of the EGR lift valve.

[0036] Example 2

[0037] like Figures 1 to 5 As shown, this embodiment provides another EGR lift valve embedded anti-corrosion structure, the structure of which includes all the contents of embodiment 1, and only the different parts are described below.

[0038] In this embodiment, a valve ring 12 is further included. The valve ring 12 is arranged in the valve disc accommodating cavity 8. The valve ring 12 is annular and is used to abut against the valve disc 11 to form better sealing, thereby ensuring the sealing performance of the EGR lift valve.

[0039] In this embodiment, it should be noted that the valve ring 12 and the second bushing 3 are an integral structure or a split structure. When a split structure is adopted, the valve ring 12 and the second bushing 3 are connected by riveting.

[0040] During processing, after the inner sleeve is made, it is placed in a mold, and then the valve body 9 is made outside the inner sleeve by using an insert casting process. The structure after the inner sleeve and the valve body 9 are assembled is as follows: Figure 4 and Figure 5 As shown, after assembly, the first flange 4 and the second flange 5 are located on the end faces of the inlet flange and the outlet flange, respectively, for connection to the pipeline and for extrusion sealing with the end faces of the pipeline connection flange. Specifically, when the inlet flange and the outlet flange end faces are sealed, a sealing ring is provided between them and the pipeline connection flange, which is extruded by bolts to achieve the effect of end face sealing. Because the sealing ring is an annular structure, a section of the valve body end face of the existing EGR poppet valve is exposed within the sealing ring, which poses a corrosion risk when in contact with exhaust gas. Therefore, the design purpose of the first flange 4 and the second flange 5 is to prevent the appearance of aluminum valve body structure within the end face sealing ring, thereby improving the corrosion resistance of the valve body.

[0041] A sealing seat is provided at the end of the connecting sleeve 2 facing away from the second bushing 3. The valve stem 10 passes through the sealing seat and is inserted into the second bushing 3. A valve disc 11 is provided at the end of the valve stem 10. The valve disc 11 is located in the valve disc accommodating cavity 8. A guide sealing mechanism is provided on the valve stem 10. The guide sealing mechanism includes a valve stem sleeve and a sealing assembly, which are sequentially mounted on the middle and upper part of the valve stem 10 from top to bottom and embedded in the valve body 9 to together constitute the sealing section of the EGR lift valve. The sealing assembly is arranged below the valve stem sleeve, and the sealing seat is directly pressed onto the stainless steel inner sleeve to ensure that the exhaust gas is blocked in the stainless steel space to avoid contact between the aluminum valve body and the exhaust gas.

[0042] 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.

[0043] 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 EGR poppet valve embedded anti-corrosion structure, characterized in that: It comprises a first bushing (1), a connecting sleeve (2) and a second bushing (3), wherein one end of the first bushing (1) is connected to the connecting sleeve (2), and one end of the second bushing (3) is connected to one end of the connecting sleeve (2); An exhaust passage (6) is provided in the first bushing (1), and a first flange (4) is provided at one end of the first bushing (1) facing away from the connecting sleeve (2); An air inlet passage (7) is provided in the second bushing (3), a second flange (5) is provided at one end of the second bushing (3) facing away from the connecting sleeve (2), and a valve disc accommodating cavity (8) is provided at one end of the second bushing (3) close to the connecting sleeve (2).

2. The EGR poppet valve embedded anti-corrosion structure according to claim 1, characterized in that: The connecting sleeve (2) and the second bushing (3) are coaxial, and the first bushing (1) is arranged in a direction perpendicular to the connecting sleeve (2).

3. The EGR poppet valve embedded anti-corrosion structure according to claim 2, characterized in that: The exhaust channel (6) is arranged along the axis of the first bushing (1), the intake channel (7) is arranged along the axis of the second bushing (3), and the intake channel (7) and the exhaust channel (6) are communicated with each other.

4. The EGR poppet valve embedded anti-corrosion structure according to claim 1, characterized in that: It also includes a valve ring (12), which is arranged in the valve disc accommodating cavity (8).

5. The EGR poppet valve embedded anti-corrosion structure according to claim 4, characterized in that: The valve ring (12) and the second bushing (3) are an integral structure.

6. The EGR poppet valve embedded anti-corrosion structure according to claim 4, characterized in that: The valve ring (12) and the second bushing (3) are separate structures.

7. The EGR poppet valve embedded anti-corrosion structure according to claim 1, characterized in that: The first bushing (1), the connecting sleeve (2) and the second bushing (3) are an integrated structure.

8. The EGR poppet valve embedded anti-corrosion structure according to claim 7, characterized in that: The first bushing (1), the connecting sleeve (2) and the second bushing (3) are all made of corrosion-resistant materials.

9. The EGR poppet valve embedded anti-corrosion structure according to claim 8, characterized in that: The first bushing (1), the connecting sleeve (2) and the second bushing (3) are all made of stainless steel.

10. The EGR poppet valve embedded anti-corrosion structure according to claim 1, characterized in that: The first bushing (1), the connecting sleeve (2) and the second bushing (3) are all cylindrical.

Images