Anti-deflection exhaust gas recirculation valve

Abstract

The invention 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, good deflection prevention and strong sealing effects are achieved, and 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 invention relates to a pump valve, in particular to an exhaust gas recirculation valve used in automobiles. Background Art

[0002] The exhaust gas recirculation valve is a mechatronic product used to guide the exhaust gas of hybrid vehicles back to the intake pipe to participate in combustion again and can adjust the amount of recirculation. After the gasoline is burned in the engine, part of the exhaust gas can enter the intake pipe again through the exhaust gas recirculation valve to participate in combustion. This process can make the fuel burn more fully and reduce energy consumption; at the same time, it can reduce the temperature of the engine combustion chamber and inhibit NO x The exhaust gas recirculation valve (EGR valve) currently used in hybrid vehicles has an unbalanced movement of the connecting block connected to the valve stem drive mechanism, and there are deflections and swings in operation, which causes the valve stem to move slightly offset, affecting the sealing of the valve plate closure; in addition, although there are guide sleeves and lower sealing rings between the valve stem and the valve body, the movement of the valve stem will still cause a small amount of exhaust gas to enter the upper part of the valve body through the gap between the valve stem and the valve body, causing the valve stem to get stuck, which seriously affects the operation of the valve. Summary of the invention

[0003] The object of the present invention is to overcome the above-mentioned disadvantages and to provide an anti-deflection exhaust gas recirculation valve with a valve stem that operates smoothly and prevents deflection.

[0004] The objective of the present invention is achieved through the following technical solution: an anti-deflection exhaust gas recirculation valve comprises a valve body and an outer cover, wherein a valve stem driving mechanism and a valve stem are mounted in the valve body, and a connecting block and a return spring, a multiple sealing assembly and a valve plate are mounted on the upper, middle and lower parts of the valve stem respectively, wherein the connecting block has a protrusion extending outward and is embedded in a groove of the outer cover.

[0005] The multiple sealing assembly includes an upper sealing ring, a guide sleeve, a shaft sleeve, and a protective cover from top to bottom. A retainer is installed in the shaft sleeve, a lower sealing ring is installed on the retainer, and a vent is provided on the shaft sleeve and at the position of the retainer. The protective cover is located at the outlet channel of the valve body, and the protective cover and the shaft sleeve are an integrated structure. The valve stem and the valve plate are an integrated structure, which ensures the verticality between the valve stem and the valve plate, and further improves the closing sealing performance of the valve plate.

[0006] After adopting the structure of the present invention, the outwardly extending protrusion of the connecting block is embedded in the groove of the outer cover to achieve balanced operation of the connecting block, prevent the deflection of the connecting block and the swing of the valve stem from affecting the movement of the valve stem, and the setting of multiple sealing components effectively prevents exhaust gas from entering the upper part of the valve stem and the interior of the valve stem driving mechanism, playing a good anti-deflection and strong sealing role, so that the valve stem moves smoothly; the integrated structural design of the valve stem and the valve plate strengthens the closing sealing of the valve plate, extends the service life of the valve stem and valve plate, thereby ensuring the quality of the exhaust gas recirculation valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The present invention is further described in detail below in conjunction with the accompanying drawings and implementation modes.

[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 in which the connecting block (and the protrusion) is connected to the outer cover. DETAILED DESCRIPTION

[0011] Reference Figures 1 to 3 It can be seen that the anti-deflection exhaust gas recirculation valve (i.e., EGR valve) of the present invention applied to the hybrid vehicle engine (traditional fuel vehicle or engineering machinery engine) includes a valve body 1 (and a valve seat 3), an outer cover 4, a valve stem driving mechanism 2 and a valve stem 7 are installed in the valve body 1, and a connecting block 5 and a return spring 9, a multiple sealing assembly 6 (between the valve body 1 and the valve stem 7), and a valve plate 8 (connected to the valve seat 3) are installed on the upper, middle, and lower parts of the valve stem 7, respectively. The connecting block 5 has a protrusion 51 extending outward and is embedded in the groove of the outer cover 4. The valve body 1 has an inlet channel 12 and an outlet channel 11. One end of the connecting block 5 is connected to the valve stem driving 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 known technology.

[0012] The multiple sealing assembly 6 includes an upper sealing ring 61, a guide sleeve 62, a shaft sleeve 63, and a protective cover 64 from top to bottom. A retainer 65 is installed in the shaft sleeve 63, and a lower sealing ring 66 (one piece each) is installed on the retainer 65. A vent hole 67 is provided on the shaft sleeve 63 and at the position of the retainer, which can effectively prevent the exhaust gas from entering the upper cavity of the valve body and the interior of the valve stem drive mechanism through the gap between the protective cover, the shaft sleeve, the guide sleeve and the valve stem, thereby affecting the product performance. The protective cover 64 is located at the position of the air outlet channel 11 of the valve body 1. The protective cover 64 and the shaft sleeve 63 are an integrated structure, which simplifies the assembly process of the two, avoids problems such as cold welding caused by welding the two, and uneven pressure force caused by welding plane difference, and can prevent the protective cover from falling off due to corrosion by exhaust gas. The valve stem 7 and the valve plate 8 are an integrated structure, which ensures the verticality between the valve stem and the valve plate, and further improves the closing sealing of the valve plate.

[0013] As shown in the attached drawings, the valve stem drive mechanism 2 of the present invention works and drives the connecting block 5, so that the valve stem 7 and the valve plate 8 move up and down linearly to open or close the valve plate (the valve plate is separated from or closed by the valve seat), and the exhaust gas enters from the air inlet channel 12 and is discharged from the air outlet channel 11. Even if there is a small amount of exhaust gas entering the multi-seal assembly 6, it can be discharged from the vent hole 67 on the shaft sleeve 63, effectively preventing the exhaust gas from entering the upper part of the valve stem and the inside of the valve stem drive mechanism 2. The outwardly extending protrusion 51 of the connecting block is embedded in the groove of the outer cover 4, so as to achieve the balance of the operation of the connecting block, and prevent the deflection of the connecting block and the swing of the valve stem from affecting the movement of the valve stem.

Claims

1. An anti-deflection exhaust gas recirculation valve, comprising a valve body and an outer cover, wherein a valve stem driving mechanism and a valve stem are installed in the valve body, characterized in that: A connecting block, a return spring, a multiple sealing assembly and a valve plate are respectively arranged on the upper part, the middle part and the lower part of the valve stem. The connecting block has a protrusion extending outward and is embedded in the groove of the outer cover.

2. The anti-deflection exhaust gas recirculation valve according to claim 1, characterized in that: The multiple sealing assembly includes an upper sealing ring, a guide sleeve, a shaft sleeve, and a protective cover from top to bottom. A retaining frame is installed in the shaft sleeve, a lower sealing ring is installed on the retaining frame, and a vent hole is provided on the shaft sleeve and at the position of the retaining frame.

3. The anti-deflection exhaust gas recirculation valve according to claim 2, characterized in that: The protective cover is located at the air outlet channel of the valve body, and the protective cover and the shaft sleeve are an integrated structure.

4. The anti-deflection exhaust gas recirculation valve according to claim 1, 2 or 3, characterized in that: The valve stem and the valve plate are an integrated structure.

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