Anti-corrosion exhaust gas recirculation valve

Abstract

The utility model discloses an anti-corrosion exhaust gas recirculation valve which comprises a valve body and an outer cover, a valve rod transmission mechanism and a valve rod are installed in the valve body, a return spring, a sealing ring and a valve plate are correspondingly installed on the upper portion, the middle portion and the lower portion of the valve rod respectively, and a reducing sleeve is installed on the valve rod and located between the valve body and the sealing ring. And a flange is arranged at the outer end of the air outlet of the valve body. The inner wall faces of the air inlet channel and the air outlet channel of the valve body and the inner wall face of the flange are coated with anti-corrosion spraying coatings. According to the exhaust gas recirculation valve, it can be effectively avoided that condensate water and corrosive gas cause corrosion of the valve body to affect sealing of the sealing ring on the valve rod and movement of the valve rod, the good corrosion-resistant, anti-corrosion and sealing effects are achieved, clamping stagnation of the valve rod is effectively prevented, the valve rod moves smoothly, 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 invention relates to a pump valve, in particular to an exhaust gas recirculation valve used in a hybrid electric vehicle. 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 a sealing ring between the valve stem and the valve body, but the movement of the valve stem will still cause a small amount of exhaust gas to enter the valve body through the gap between the valve stem and the valve body, causing the valve stem to get stuck, seriously affecting the operation of the valve. In addition, the valve body is made of metal, and its airway surface is prone to corrosion and has a large amount of white corrosives. The corrosives will enter the valve body with the movement of the valve stem, causing the valve stem to get stuck. Summary of the invention

[0003] The object of the present invention is to overcome the above-mentioned disadvantages and to provide an anti-corrosion exhaust gas recirculation valve with a smooth valve stem operation and good sealing performance.

[0004] The objective of the present invention is achieved through the following technical solution: an anti-corrosion exhaust gas recirculation valve comprises a valve body and an outer cover, wherein a valve stem transmission mechanism and a valve stem are installed in the valve body, and a return spring, a sealing ring and a valve plate are installed at the upper, middle and lower parts of the valve stem respectively, and an adapter sleeve is installed on the valve stem and between the valve body and the sealing ring.

[0005] A flange is arranged at the outer end of the gas outlet of the valve body. The inner wall surfaces of the gas inlet channel and the gas outlet channel of the valve body and the inner wall surface of the flange are all coated with an anti-corrosion spray coating, which effectively isolates them from contact with corrosive gas.

[0006] An anti-corrosion coating layer is applied on the outer surface of the valve stem to prevent condensed water and corrosive gases from causing corrosion to the valve body and affecting the outer surface and operation of the valve stem.

[0007] A guide sleeve is arranged on the valve stem and above the sealing ring, and a protective cover is arranged on the valve stem and below the sealing ring, and the protective cover is connected with the adapter sleeve.

[0008] After adopting the structure of the present invention, the sealing performance between the valve body and the sealing ring is increased by setting the adapter sleeve, and the flange is set to prevent condensed water and corrosive gases from causing corrosion of the valve body and affecting the sealing of the sealing ring on the valve stem and the movement of the valve stem. The inner wall surfaces of the air inlet channel and the air outlet channel of the valve body and the inner wall surface of the flange are coated with an anti-corrosion spray layer, and the outer surface of the valve stem is coated with an anti-corrosion coating layer, which plays a good role in corrosion resistance, corrosion prevention and sealing, effectively preventing the valve stem from being stuck, making the valve stem move smoothly, extending the service life of the valve body and valve stem, and ensuring the quality of the exhaust gas recirculation valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The present invention is further described in detail below in conjunction with the accompanying drawings and implementation modes.

[0010] Figure 1 It is a structural schematic diagram of the present invention.

[0011] Figure 2 for Figure 1 sectional view of . DETAILED DESCRIPTION

[0012] Reference Figure 1 , Figure 2 It can be seen that the corrosion-resistant exhaust gas recirculation valve (i.e., EGR valve) applied to the hybrid vehicle engine of the present invention comprises a valve body 5 (and a valve seat 10), an outer cover 1, a valve stem transmission mechanism 12 (including a valve stem power source and an intermediate transmission component) and a valve stem 8 are installed in the valve body 5, a return spring 6, a sealing ring 3 (seals the upper area of ​​the valve body), and a valve plate 11 (contacting or separating with the valve seat 10 on the valve body 5 to achieve opening and closing) are installed on the upper, middle, and lower parts of the valve stem 8, respectively, and an adapter sleeve 2 (stainless steel material, inlaid) is installed on the valve stem 8 and between the valve body 5 and the sealing ring 3. A flange 4 (stainless steel material) is installed at the outer end of the gas outlet of the valve body 5 to prevent condensed water and corrosive gases from causing corrosion of the valve body and affecting the sealing effect of the sealing ring on the valve stem and the movement of the valve stem.

[0013] A guide sleeve 7 is installed on the valve stem 8 and above the sealing ring 3, and a protective cover 9 is installed on the valve stem 8 and below the sealing ring 3. The protective cover 9 is connected to the adapter sleeve 2 to enhance the overall sealing and the guiding performance of the valve stem. The inside of the valve body 5 outside the valve plate 11 is an air inlet channel 51, and the inside of the valve body between the valve plate 11 and the flange 4 is an air outlet channel 52. The air inlet channel 51 and the air outlet channel 52 of the valve body 5 form a valve body airway. The inner wall surfaces of the air inlet channel 51 and the air outlet channel 52 of the valve body 5 and the inner wall surface of the flange 4 are coated with an anti-corrosion spray coating (Teflon spraying method), which can effectively isolate them from contact with corrosive gases. The outer surface of the valve stem 8 is coated with an anti-corrosion coating layer (PVD vacuum coating method) to prevent condensed water and corrosive gases from causing corrosion of the valve body and affecting the outer surface and operation of the valve stem.

Claims

1. Anti-corrosion exhaust gas recirculation valve, comprising a valve body and an outer cover, wherein a valve stem transmission mechanism and a valve stem are installed in the valve body, and a return spring, a sealing ring, and a valve plate are installed at the upper, middle, and lower parts of the valve stem, respectively, and characterized in that: A transfer sleeve is arranged on the valve stem and between the valve body and the sealing ring.

2. The anti-corrosion exhaust gas recirculation valve according to claim 1, characterized in that: A flange is arranged at the outer end of the gas outlet of the valve body.

3. The anti-corrosion exhaust gas recirculation valve according to claim 2, characterized in that: The inner wall surfaces of the air inlet channel and the air outlet channel of the valve body and the inner wall surface of the flange are all coated with an anti-corrosion spray layer.

4. The anti-corrosion exhaust gas recirculation valve according to claim 1 or 2, characterized in that: An anti-corrosion coating layer is coated on the outer surface of the valve stem.

5. The anti-corrosion exhaust gas recirculation valve according to claim 1 or 2, characterized in that: A guide sleeve is arranged on the valve stem and above the sealing ring, and a protective cover is arranged on the valve stem and below the sealing ring, and the protective cover is connected with the adapter sleeve.

Images