Flow precision control type exhaust gas recirculation valve

Abstract

This invention discloses a flow-precision control type exhaust gas recirculation valve, comprising a valve body and an outer cover. A valve stem drive mechanism and a valve stem are installed within the valve body. A linkage assembly, a sealing assembly, and a valve plate are respectively installed at the upper, middle, and lower ends of the valve stem. The valve plate corresponds to a valve seat on the lower part of the valve body. A cylindrical step is provided on the top of the valve plate, and the valve plate and valve stem are an integrated structure. The outer diameter of the valve plate is slightly larger than the outer diameter of the cylindrical step. An assembly groove is provided on the bottom surface of the lower end of the valve stem where it connects with the valve plate. This invention can precisely control the exhaust gas flow rate at small openings between the valve plate, its cylindrical step, and the valve seat. The integrated structure of the valve plate and valve stem ensures the perpendicularity between the valve stem and valve plate without swaying, further improving the valve plate's closing sealing performance, thereby ensuring the quality of the exhaust gas recirculation valve.

Description

Technical Field

[0001] This invention relates to pumps and valves, and more specifically to an exhaust gas recirculation valve for use in automobiles. Background Technology

[0002] An exhaust gas recirculation (EGR) valve is an electromechanical integrated product used to guide exhaust gas back into the intake manifold for re-combustion and to regulate the recirculation flow. After gasoline burns in the engine, a portion of the exhaust gas can be re-entered into the intake manifold through the EGR valve to participate in combustion again. This process allows for more complete fuel combustion, reducing energy consumption; it also lowers the temperature of the engine combustion chamber, thus inhibiting NO₂ production. x The compound produces a compound that reduces heat loss and decreases engine load.

[0003] Currently, the exhaust gas recirculation (EGR) valves used in hybrid vehicles have a separate valve stem and valve plate assembly. During the raising and lowering of the valve stem, the valve plate and valve seat open or close to control the entry of exhaust gas. If the valve plate is misaligned or deviated, there may be a small opening between it and the valve seat, making it impossible to accurately control the exhaust gas flow. The sealing performance when closed is also affected, thus impacting the proper functioning of the valve. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a flow-precise control type exhaust gas recirculation valve that allows for precise control of exhaust gas flow with a small opening between the valve plate and the valve seat, and smooth operation of the valve stem and valve plate.

[0005] The objective of this invention is achieved through the following technical solution: a flow-precision control type exhaust gas recirculation valve, comprising a valve body and an outer cover, wherein a valve stem drive mechanism and a valve stem are installed in the valve body, and a linkage component, a sealing component, and a valve plate are respectively installed at the upper end, middle part, and lower end of the valve stem, wherein the valve plate corresponds to the valve seat on the lower part of the valve body, and a cylindrical step is provided on the top of the valve plate, wherein the valve plate and the valve stem are an integrated structure.

[0006] The outer diameter of the valve plate is slightly larger than the outer diameter of the cylindrical step. An assembly groove is provided on the bottom surface of the lower end of the valve stem, where it connects with the valve plate. An air passage insert is embedded in the lower part of the valve body, on the inner surface of the gas passage within the valve body.

[0007] The valve stem, valve plate, valve seat, and air passage insert are all made of austenitic stainless steel, which has good corrosion resistance, strength, heat resistance, plasticity, and toughness.

[0008] By adopting the structure of this invention, the flow rate of exhaust gas at a small opening between the valve plate, the cylindrical step on top, and the valve seat can be precisely controlled by adjusting the lifting height of the valve plate. The valve plate and valve stem are an integral structure, ensuring the perpendicularity between the valve stem and valve plate without swaying, further improving the valve plate's sealing performance. The austenitic stainless steel material extends the service life of the valve stem, valve plate, and valve seat, thereby ensuring the quality of the exhaust gas recirculation valve. Attached Figure Description

[0009] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0010] Figure 1 This is a schematic diagram of the flow-precision control exhaust gas recirculation valve of the present invention.

[0011] Figure 2 for Figure 1 A schematic diagram of the structure in which the valve seat, valve stem, and valve plate are connected.

[0012] Figure 3 for Figure 1 A schematic diagram of the structure in which the valve body, valve seat, valve stem, valve plate, and air passage insert are connected. Detailed Implementation

[0013] Reference Figures 1 to 3 As can be seen, the present invention relates to a flow-precision control exhaust gas recirculation valve (EGR valve) for hybrid vehicle engines (or engines of traditional fuel vehicles or construction machinery), comprising a valve body 1, a valve seat 2, and an outer cover 3. The valve body 1 houses a valve stem drive mechanism 4 (including a motor 41, motor gear 42, transmission gear 43, transmission shaft 44, etc.) and a valve stem 5. The upper, middle, and lower ends of the valve stem 5 are respectively equipped with a linkage assembly 6 (including a connecting block and a return spring, etc.), a sealing assembly 7, and a valve plate 8. The valve plate 8 corresponds to the valve seat 2 on the lower part of the valve body. The top of the valve plate 8 has a cylindrical step 81. The valve plate 8 and the valve stem 5 are an integrated structure. The outer diameter of the valve plate 8 is slightly larger than the outer diameter of the cylindrical step 81.

[0014] An assembly groove 51 is provided on the bottom surface of the lower end of the valve stem 5, where it connects with the valve plate, to facilitate the assembly of the upper end of the valve stem with the linkage assembly. The assembly groove 51 is an "I"-shaped groove (e.g., ...). Figure 2 As shown in the diagram, or a cross-shaped groove, a special tool is inserted into the mounting groove to screw the upper end thread 52 of the valve stem into the linkage assembly 6. A gas passage insert 10 is embedded in the lower part of the valve body 1 and on the inner surface of the gas passage 9 of the valve body, making the gas passage corrosion-resistant and with a long service life. The valve stem 5, valve plate 8, valve seat 2, and gas passage insert 10 are all made of austenitic stainless steel, possessing good corrosion resistance, strength, heat resistance, plasticity, and toughness.

[0015] As shown in the attached figures, the valve stem drive mechanism 4 of the present invention operates to drive the linkage assembly 6, causing the valve stem 5 and valve plate 8 to move vertically to open or close the valve plate (the valve plate 8 separates from or closes with the valve seat 2), allowing exhaust gas to enter between the valve plate and the valve seat and exit through the gas passage 9. By adjusting the lifting height of the valve plate 8 and its top cylindrical step 81, the flow rate of exhaust gas with a small opening between the valve plate and the valve seat can be precisely controlled. The sealing assembly 7 effectively prevents exhaust gas from entering the upper part of the valve stem and the interior of the valve stem drive mechanism 4.

Claims

1. A flow-precision control type exhaust gas recirculation valve, comprising a valve body and an outer cover, wherein a valve stem drive mechanism and a valve stem are installed in the valve body, and a linkage assembly, a sealing assembly, and a valve plate are respectively installed at the upper end, middle part, and lower end of the valve stem, wherein the valve plate corresponds to a valve seat on the lower part of the valve body, characterized in that: The valve plate has a cylindrical step at its top, and the valve plate and valve stem are an integrated structure.

2. The precision flow control exhaust gas recirculation valve of claim 1, wherein: The outer diameter of the valve plate is slightly larger than the outer diameter of the cylindrical step.

3. The precisely controlled flow exhaust gas recirculation valve of claim 1 or 2, wherein: An assembly groove is provided on the bottom surface of the lower end of the valve stem, where it contacts the valve plate.

4. The precision flow control exhaust gas recirculation valve of claim 3, wherein: The assembly groove is either an "I" shaped groove or a "+" shaped groove.

5. The precision flow control exhaust gas recirculation valve of claim 1 or 2, wherein: An air passage insert is embedded in the lower part of the valve body and on the inner surface of the gas passage of the valve body.

6. The precision flow control exhaust gas recirculation valve of claim 5, wherein: The valve stem, valve plate, valve seat, and air passage insert are all made of austenitic stainless steel.

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