Anti-corrosion highly-sealed exhaust gas recirculation valve

Abstract

The utility model discloses an anti-corrosion highly-sealed 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 multi-layer 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 air channel nests are arranged in the valve body and on the inner walls of the air inlet channel and the air outlet channel of the valve body. Condensate water and corrosive gas can be effectively prevented from corroding the valve body to affect movement of the valve rod, waste gas is effectively prevented from entering the upper portion of the valve rod and the interior of the valve rod driving mechanism through the arrangement of the multiple layers of sealing assemblies, the good corrosion resistance, corrosion prevention and strong sealing effects are achieved, clamping stagnation of the valve rod is effectively prevented, the valve rod moves smoothly, and the service life of the valve rod is prolonged. The service life of the valve body and the valve rod is prolonged, and 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 pump valve applied to a hybrid vehicle

[0002] Exhaust gas recirculation valve. BACKGROUND

[0003] The exhaust gas recirculation valve is a mechatronic product for guiding the exhaust gas of a hybrid vehicle to flow back to the intake pipe to participate in combustion again and can adjust the flow rate. After gasoline is combusted in an engine, a part of the exhaust gas can enter the intake pipe again to participate in combustion through the exhaust gas recirculation valve. This process can make the fuel combustion more complete, reduce energy consumption, and reduce the temperature of the combustion chamber of the engine, thereby having the effect of reducing NOx x generation, reducing heat loss, and reducing the burden on the engine. The exhaust gas recirculation valve (i.e., the EGR valve) currently applied to a hybrid vehicle has a valve body made of metal, and the inner surface of the gas passage of the valve body is easily corroded by exhaust gas, resulting in a large amount of white corrosion product. The corrosion product can enter the inside of the valve body along with the movement of the valve rod, causing the valve rod to jam. In addition, although a guide sleeve and a lower sealing ring are arranged between the valve rod and the valve body, a small amount of exhaust gas can still enter the upper part of the valve body through the gap between the valve rod and the valve body, causing the valve rod to jam and seriously affecting the operation of the valve. SUMMARY

[0004] The present application aims to overcome the above-mentioned deficiencies and provide an anti-corrosion strong sealing type exhaust gas recirculation valve with smooth operation of the valve rod and good sealing performance.

[0005] The purpose of the present application is achieved by the following technical solution: an anti-corrosion strong sealing type exhaust 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 and a return spring, a multi-layer sealing assembly, and a valve piece arranged in the upper, middle, and lower parts of the valve rod, respectively, and a gas passage nest arranged in the valve body and on the inner walls of the intake passage and the exhaust passage of the valve body.

[0006] The gas passage nest is made of stainless steel, and the exhaust outlet and the intake inlet of the gas passage nest are outwardly protruding and embedded in the valve body, which is beneficial to the firm embedding installation. The multi-layer sealing assembly comprises, from top to bottom, a guide sleeve, a shaft sleeve, and a protective cover, a retainer is arranged in the shaft sleeve, sealing rings are arranged at the upper and lower positions of the retainer, and air holes are arranged on the shaft sleeve and at the position of the retainer. The protective cover is connected with the gas passage nest at the position of the exhaust passage. A scraper is further arranged on the valve rod and between the shaft sleeve and the protective cover, which can timely scrape off the corrosion product or other impurities on the valve rod.

[0007] By adopting the structure of the present application, the exhaust gas is isolated from the air inlet channel and the air outlet channel of the valve body by setting the air channel nest, so as to avoid the corrosion of the valve body caused by condensed water and corrosive gas, thereby affecting the movement of the valve rod. The setting of the multi-layer sealing assembly effectively prevents the exhaust gas from entering the upper part of the valve rod and the inside of the valve rod driving mechanism. Thus, good corrosion resistance, anti-corrosion and strong sealing effects are achieved, the jamming of the valve rod is effectively prevented, the movement of the valve rod is smooth, the service life of the valve body and the valve rod is prolonged, and the quality of the exhaust gas recirculation valve is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0008] The present application will be further described in detail below in combination with the drawings and embodiments.

[0009] Figure 1 It is a structural schematic diagram of the present application.

[0010] Figure 2 It is a structural schematic diagram of the multi-layer sealing assembly in Figure 1 . DETAILED DESCRIPTION

[0011] As can be seen from Figure 1 , Figure 2 , the present application is applied to the anti-corrosion and strong sealing exhaust gas recirculation valve (i.e. 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 6), an outer cover 2, a valve rod driving mechanism 8 and a valve rod 5 which are arranged in the valve body 1, a connecting block 9 and a return spring 10 which are respectively arranged in the upper part, the middle part and the lower part of the valve rod 5, a multi-layer sealing assembly 3 which is arranged between the valve body 1 and the valve rod 5, and a valve piece 7 which is connected with the valve seat 6, wherein an air channel nest 4 is arranged in the valve body 1 and is inlaid on the inner wall of the air inlet channel 12 and the air outlet channel 11 of the valve body 1. One end of the connecting block 9 is connected with the valve rod driving mechanism 8, and the other end of the connecting block 9 is sleeved with the valve rod 5. The return spring 10 is sleeved on the connecting block 9 and the valve rod 5, which is a known technology.

[0012] The air channel nest 4 is made of stainless steel, and outward protrusions 43 are arranged at the air outlet 41 and the air inlet 42 of the air channel nest 4 to be inlaid in the valve body, which is beneficial to the inlaid installation and makes the installation more firm. The multi-layer sealing assembly 3 comprises, from top to bottom, a guide sleeve 36, a shaft sleeve 31, a protective cover 35, a retainer 32 which is arranged in the shaft sleeve 31, sealing rings 33 (O-rings, sleeved) which are arranged at the upper and lower positions of the retainer 32, and air holes 37 which are arranged on the shaft sleeve 31 and at the position of the retainer. The protective cover 35 is connected with the air channel nest 4 at the position of the air outlet channel, which effectively prevents the exhaust gas from entering the upper part of the valve body and the inside of the valve rod driving mechanism through the multi-layer sealing assembly. A wiper 34 is further arranged on the valve rod 5 and between the shaft sleeve 31 and the protective cover 35, which is used to timely remove the corrosive substances or other impurities on the valve rod.

[0013] As shown in the drawings, the valve stem drive mechanism 8 of the present application operates to move the connecting block 9, which causes the valve stem 5 to move up and down in a straight line to open or close the valve disc (separation or closure of the valve disc from the valve seat), to allow exhaust gas to enter from the inlet passage 12 and to exit from the outlet passage 11. Even if a small amount of exhaust gas enters the multi-layer seal assembly 3, it is effectively prevented from entering the upper portion of the valve stem and the interior of the valve stem drive mechanism 8 by the vent hole 37 in the bushing 31.

Claims

1. An erosion resistant, high sealing EGR valve comprising a valve body, an outer cover, a valve stem drive mechanism and a valve stem housed within the 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 multi-layer sealing assembly and a valve plate, and a gas channel nest is arranged in the valve body and on the inner wall of the inlet channel and the outlet channel of the valve body.

2. The erosion resistant, high sealing EGR valve of claim 1, wherein: The gas channel nest is made of stainless steel and has outward protrusions at the outlet and inlet of the gas channel nest to be embedded in the valve body.

3. The erosion resistant, high sealing EGR valve of claim 2, wherein: The multi-layer sealing assembly includes, from top to bottom, a guide sleeve, a shaft sleeve and a protective cover, the shaft sleeve is provided with a retainer, the retainer is provided with sealing rings at the upper and lower positions, and the shaft sleeve is provided with air holes at the position of the retainer.

4. The erosion resistant, high sealing EGR valve of claim 3, wherein: The protective cover is connected with the gas channel nest at the position of the outlet channel.

5. The erosion resistant, high sealing EGR valve of claim 3, wherein: A scraper is further arranged on the valve rod between the shaft sleeve and the protective cover.

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