Multiple strong sealing type exhaust gas recirculation valve

Abstract

The utility model discloses a multiple strong sealing type 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, and a connecting block, a return spring, a 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. The sealing assembly sequentially comprises an upper sealing ring, a guide sleeve, a shaft sleeve and a protective cover from top to bottom, a retainer is mounted in the shaft sleeve, a lower sealing ring is mounted on the retainer, and vent holes are formed in the position, at the retainer, of the shaft sleeve. The protective cover and the shaft sleeve are of an integrated structure. The valve rod and the valve plate are of an integrated structure. Multiple strong sealing effects can be 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 waste gas recirculation valve applied to a hybrid vehicle. BACKGROUND

[0002] The waste gas recirculation valve is a mechatronic product for guiding the waste gas of the hybrid vehicle to flow back to the intake pipe to participate in combustion again and can adjust the flow rate. After the gasoline is combusted in the engine, a part of the exhaust gas can enter the intake pipe again to participate in combustion through the waste gas recirculation valve. This process can make the fuel combustion more sufficient, reduce the energy consumption, and reduce the temperature of the combustion chamber of the engine, thereby inhibiting the generation of NO x xide, reducing the heat loss, and reducing the burden of the engine. The current waste gas recirculation valve (i.e. EGR valve) applied to the hybrid vehicle is provided with a guide sleeve and a lower sealing ring between the valve rod and the valve body, but the movement of the valve rod still causes a small amount of waste gas to enter the upper part of the valve rod through the gap between the valve rod and the valve body, thereby causing the valve rod to be stuck, and thus seriously affecting the operation of the valve. SUMMARY

[0003] The present application aims to overcome the above-mentioned deficiencies, and provides a multiple strong sealing type waste gas recirculation valve with smooth operation of the valve rod and good sealing performance.

[0004] The present application is achieved by the following technical scheme: a multiple strong sealing type waste gas recirculation valve, comprising a valve body, an outer cover, a valve rod driving mechanism and a valve rod arranged in the valve body, a connecting block, a return spring, a sealing assembly, and a valve piece arranged in the upper part, the middle part, and the lower part of the valve rod respectively, wherein the sealing assembly comprises, 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, and the lower sealing ring is arranged on the retainer, an air hole is arranged on the shaft sleeve and at the position of the retainer, the upper sealing ring is adjacent to the bottom of the connecting block, and the protective cover is arranged at the position of the air outlet of the valve body.

[0005] The protective cover and the shaft sleeve are in an integrated structure, which simplifies the assembly process of the two, and avoids the protective cover from falling off due to corrosion by the waste gas. The valve rod and the valve piece are in an integrated structure, which ensures the perpendicularity between the valve rod and the valve piece, and further improves the closing sealing performance of the valve piece.

[0006] After the structure of the present application is adopted, the sealing assembly composed of the upper sealing ring, the guide sleeve, the shaft sleeve, and the protective cover is arranged in multiple and multiple levels to effectively prevent the waste gas from entering the upper part of the valve rod and the inside of the valve rod driving mechanism, thereby achieving good strong sealing effect and making the valve rod move smoothly. The integrated structure design of the valve rod and the valve piece strengthens the closing sealing performance of the valve piece, prolongs the service life of the valve rod and the valve piece, and thus ensures the quality of the waste gas recirculation valve. BRIEF DESCRIPTION OF DRAWINGS

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

[0008] Figure 1 The structural schematic diagram of the application is shown in the figure.

[0009] Figure 2 The structural schematic diagram of the sealing assembly in the valve stem and the valve plate is shown in the figure. Figure 1 The structural schematic diagram of the sealing assembly in the valve stem and the valve plate is shown in the figure. DETAILED DESCRIPTION

[0010] Referring to Figure 1 , Figure 2 It can be seen that the application is applied to a multiple strong sealing exhaust gas recirculation valve (EGR valve) of a hybrid vehicle engine (engine of a traditional fuel vehicle or engineering machinery), which comprises a valve body 1 (and a valve seat 3), an outer cover 4, a valve stem driving mechanism 2 and a valve stem 7 which are arranged in the valve body 1, a connecting block 5, a return spring 9, a sealing assembly 6 (between the valve body 1 and the valve stem 7) and a valve plate 8 (connected with the valve seat 3) which are arranged in the upper part, the middle part and the lower part of the valve stem 7 respectively, the sealing assembly 6 comprises, from top to bottom, an upper sealing ring 61, a guide sleeve 62, a shaft sleeve 63 and a protective cover 64 in sequence, the shaft sleeve 63 is arranged with a retainer 65, the retainer 65 is arranged with a lower sealing ring 66 (one piece each in the upper and lower parts), the shaft sleeve 63 is arranged with a vent hole 67 at the position of the retainer, the upper sealing ring 61 is adjacent to the bottom of the connecting block 5, and the protective cover 64 is arranged at the position of the gas outlet channel 11 of the valve body 1, which can effectively prevent exhaust gas from entering the upper cavity of the valve body and the inside of the valve stem driving mechanism through the gap between the protective cover, the shaft sleeve, the guide sleeve and the valve stem.

[0011] The connecting block 5 is arranged with a protrusion 51 which is embedded into the groove of the outer cover 4. The valve body 1 is arranged with an air inlet channel 12 and a gas outlet channel 11. One end of the connecting block 5 is connected with the valve stem driving mechanism 2, and the other end is sleeved with the valve stem 7, and the return spring 9 is sleeved on the connecting block 5 and the valve stem 7. The protective cover 64 and the shaft sleeve 63 are in an integrated structure, which simplifies the assembly process of the two, avoids problems such as uneven stress caused by virtual welding and welding plane difference due to welding, and can avoid the protective cover from falling off due to corrosion by exhaust gas. The valve stem 7 and the valve plate 8 are in an integrated structure, which ensures the perpendicularity between the valve stem and the valve plate, and further improves the closing sealing performance of the valve plate. The outer surfaces of the valve stem 7 and the valve plate 8 are coated with an anti-corrosion plating film layer (PVD vacuum plating film method), which avoids the influence of condensate water and corrosive gas on the outer surface of the valve stem and its stable work caused by corrosion of the valve stem and the valve plate, and plays a good anti-corrosion and wear-resistant role.

[0012] As shown in the drawings, the valve stem drive mechanism 2 of the present application operates to drive the connecting block 5, causing the valve stem 7 and the valve disc 8 to move up and down linearly to open or close the valve disc (separation or closure of the valve disc from the valve seat), allowing exhaust gas to enter from the inlet passage 12 and exit from the outlet passage 11. Even if a small amount of exhaust gas enters the seal assembly 6, it can be discharged from the vent hole 67 in the shaft sleeve 63, effectively preventing exhaust gas from entering the upper portion of the valve stem and the interior of the valve stem drive mechanism 2.

Claims

1. A multiple strong seal 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 a return spring, a sealing assembly and a valve piece, the sealing assembly comprises, from top to bottom, an upper sealing ring, a guide sleeve, a shaft sleeve, a protective cover, the shaft sleeve is provided with a retainer, the lower sealing ring is arranged on the retainer, the shaft sleeve is provided with a vent hole at the position of the retainer, the upper sealing ring is adjacent to the bottom of the connecting block, and the protective cover is located at the position of the air outlet channel of the valve body.

2. The multiple strong seal exhaust gas recirculation valve of claim 1, wherein: The protective cover and the shaft sleeve are in an integral structure.

3. The multiple strong seal EGR valve of claim 1 or 2, wherein: The valve rod and the valve piece are in an integral structure.

4. The multiple strong seal EGR valve of claim 3, wherein: The outer surfaces of the valve rod and the valve piece are coated with an anticorrosion plating film layer.

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