Anti-deflection exhaust gas recirculation valve

Abstract

The utility model discloses an anti-deflection exhaust gas recirculation valve which comprises a valve body and an outer cover, a valve rod driving mechanism and a valve rod are arranged in the valve body, a connecting block, a return spring, a multiple sealing assembly and a valve plate are correspondingly arranged on the upper portion, the middle portion and the lower portion of the valve rod respectively, and the connecting block is provided with a protruding block extending outwards and embedded into a groove of the outer cover. The protective cover and the shaft sleeve are of an integrated structure. The valve rod and the valve plate are of an integrated structure. Deflection of the connecting block and deflection of the valve rod can be effectively prevented, and good deflection prevention, corrosion prevention and strong sealing effects are achieved, so that the valve rod moves smoothly; the valve rod and the valve plate are of an integrated structure design, the closing sealing performance of the valve plate is enhanced, the service life of the valve rod and the valve plate is prolonged, and therefore the quality of the exhaust gas recirculation valve is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to a pump valve, in particular to a kind of exhaust gas recirculation valve applied to automobile. BACKGROUND

[0002] Exhaust gas recirculation valve is used to guide the exhaust gas of hybrid vehicle to flow back to intake pipe to participate in combustion again and can adjust the flow rate.Efficiency of compound generation, reduce heat loss, reduce the burden of engine.The exhaust gas recirculation valve (i.e.EGR valve) currently applied to hybrid vehicle, the connecting block connected with the valve rod driving mechanism is not balanced, there is running deflection, deflection, which leads to the movement of valve rod also with slight deviation, affects the sealing of valve piece closing;And, although the guide sleeve and lower sealing ring are installed between the valve rod and valve body, the movement of valve rod still makes a small amount of exhaust gas enter the upper part of valve body through the gap between valve rod and valve body and causes valve rod to be stuck, thereby seriously affecting the work of the valve. x The present application relates to a pump valve, in particular to a kind of exhaust gas recirculation valve applied to automobile. SUMMARY

[0003] The present application relates to a pump valve, in particular to a kind of exhaust gas recirculation valve applied to automobile.

[0004] The present application relates to a pump valve, in particular to a kind of exhaust gas recirculation valve applied to automobile.

[0005] The multiple sealing assembly includes upper sealing ring, guide sleeve, shaft sleeve and protective cover from top to bottom in sequence, the shaft sleeve is provided with retainer, and the lower sealing ring is installed on the retainer, and the air hole is arranged on the shaft sleeve and at the position of retainer.The protective cover is located at the position of exhaust passage of valve body, and the protective cover and shaft sleeve are integrated structure.The valve rod and valve piece are integrated structure, which guarantees the perpendicularity between valve rod and valve piece, and further improves the closing sealing property of valve piece.

[0006] With the structure of the present invention, the outward-extending protrusions of the connecting block are embedded in the grooves of the outer cover, achieving balanced operation of the connecting block and preventing deflection of the connecting block and swing of the valve stem from affecting the movement of the valve stem. The anti-corrosion coating design prevents condensed water and corrosive gases from corroding the valve stem and valve disc, which could affect the outer surface of the valve stem and its stable operation. The multiple sealing components effectively prevent exhaust gas from entering the upper portion of the valve stem and the interior of the valve stem drive mechanism, providing excellent anti-deflection and strong sealing effects, ensuring smooth valve stem movement. The integrated structural design of the valve stem and valve disc strengthens the closing seal of the valve disc, extending the service life of the valve stem and valve disc, thereby ensuring the quality of the exhaust gas recirculation valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0008] Figure 1 It is a structural schematic diagram of the present invention.

[0009] Figure 2 for Figure 1 Schematic diagram of the structure in which the multiple sealing components are connected to the valve stem and valve plate.

[0010] Figure 3 for Figure 1 Schematic diagram of the structure where the connecting block (and protrusion) is connected to the outer cover. DETAILED DESCRIPTION

[0011] Reference Figures 1 to 3 The present invention discloses an anti-deflection exhaust gas recirculation valve (EGR valve) for hybrid vehicle engines (traditional fuel vehicles or engineering machinery engines). The valve body 1 includes a valve seat 3 and an outer cover 4. A valve stem drive mechanism 2 and a valve stem 7 are mounted within the valve body 1. A connecting block 5 and a return spring 9, a multi-seal assembly 6 (located between the valve body 1 and the valve stem 7), and a valve disc 8 (connected to the valve seat 3) are mounted on the upper, middle, and lower portions of the valve stem 7, respectively. The connecting block 5 has an outwardly extending protrusion 51 that fits within a groove in the outer cover 4. The outer surfaces of the valve stem 7 and valve disc 8 are coated with an anti-corrosion coating (PVD vacuum coating) to prevent corrosion of the valve stem and disc caused by condensed water and corrosive gases, which could affect the outer surfaces of the valve stem and stabilize its operation. This provides excellent corrosion and wear resistance. The valve body 1 includes an inlet passage 12 and an outlet passage 11. One end of the connecting block 5 is connected to the valve stem drive mechanism 2, and the other end thereof is sleeved with the valve stem 7. The return spring 9 is sleeved on the connecting block 5 and the valve stem 7, which is a well-known technology.

[0012] The multiple sealing assembly 6 comprises, from top to bottom, an upper sealing ring 61, a guide sleeve 62, a shaft sleeve 63, a protective cover 64, a retainer 65 mounted in the shaft sleeve 63, a lower sealing ring 66 (one each on top and bottom) mounted on the retainer 65, and a vent hole 67 provided on the shaft sleeve 63 at the position of the retainer, which can effectively prevent exhaust gas from entering the upper cavity of the valve body and the interior of the valve rod driving mechanism through the gap between the protective cover, the shaft sleeve, the guide sleeve and the valve rod, thereby affecting the product performance. The protective cover 64 is located at the position of the exhaust passage 11 of the valve body 1, and the protective cover 64 and the shaft sleeve 63 are of an integrated structure, which simplifies the assembly process of the two, avoids problems such as uneven stress caused by uneven welding plane due to welding, and can avoid the protective cover from falling off due to corrosion by exhaust gas. The valve rod 7 and the valve disc 8 are of an integrated structure, which ensures the perpendicularity between the valve rod and the valve disc, and further improves the closing sealing performance of the valve disc.

[0013] As shown in the drawings, the valve rod driving mechanism 2 of the present application works to drive the connecting block 5, so that the valve rod 7 and the valve disc 8 move linearly up and down to open or close the valve disc (the valve disc separates from or closes the valve seat), and exhaust gas enters from the inlet passage 12 and is discharged from the outlet passage 11. Even if a small amount of exhaust gas enters the multiple sealing assembly 6, it can be discharged from the vent hole 67 on the shaft sleeve 63, effectively preventing exhaust gas from entering the upper part of the valve rod and the interior of the valve rod driving mechanism 2. The connecting block is embedded in the groove of the outer cover 4 through the outwardly extending protrusions 51 of the connecting block, which realizes the balance of the operation of the connecting block, prevents the deflection of the connecting block and the yaw of the valve rod, and affects the movement of the valve rod.

Claims

1. A deflection-proof exhaust gas recirculation valve comprising a valve body, an outer cover, a valve stem drive mechanism and a valve stem housed within said valve body, characterized in that: The upper, middle and lower parts of the valve rod are respectively provided with a connecting block and return spring, a multiple sealing assembly and a valve plate, the connecting block has outwardly extending protrusions embedded into the grooves of the outer cover, and the outer surfaces of the valve rod and valve plate are coated with an anticorrosion plating layer.

2. The anti -deflection exhaust gas recirculation valve of claim 1, wherein: The multiple sealing assembly includes, from top to bottom, an upper sealing ring, a guide sleeve, a shaft sleeve and a protective cover, the shaft sleeve is provided with a retainer, the lower sealing ring is mounted on the retainer, and the shaft sleeve is provided with a vent hole at the position of the retainer.

3. The deflection resistant exhaust gas recirculation valve of claim 2, wherein: The protective cover is located at the air outlet passage of the valve body, and the protective cover and the shaft sleeve are of an integral structure.

4. The deflection resistant exhaust gas recirculation valve of claim 1 or 2, wherein: The valve rod and the valve plate are of an integral structure.

Images