Corrosion-resistant lightweight exhaust gas recirculation valve

Abstract

The corrosion-resistant lightweight exhaust gas recirculation valve comprises a valve body and an outer cover, a valve rod driving mechanism and a valve rod are installed in the valve body, the valve rod is composed of an upper valve rod body and a lower valve rod body, and a valve plate is installed between the upper valve rod body and the lower valve rod body; a plastic lining is arranged in the lower portion of the valve body and on the inner surface of the gas channel of the valve body, and the valve plate is located in the plastic lining to achieve opening or closing. The corrosion resistance and reliability of the valve body can be enhanced, the gas flow stability of the gas channel can be optimized, therefore, the overall weight of the exhaust gas recirculation valve is relatively reduced, the light weight requirement is met, the sealing performance is continuously enhanced through the multi-layer sealing piece, the operation smoothness of the valve rod is improved, and the clamping stagnation probability of the valve rod is reduced. Therefore, the work of the exhaust gas recirculation valve is ensured.

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 (i.e. EGR valve) is used to guide automobile exhaust gas backflow to intake pipe to participate in combustion again and can adjust backflow volume.Motor gasoline burns in engine, and part of exhaust gas can enter intake pipe again to participate in combustion through exhaust gas recirculation valve.The process can make fuel combustion more sufficient, reduce energy consumption;While reducing the temperature of engine combustion chamber, it has the effect of inhibiting NO x Compound generation, reduce heat loss, reduce engine burden.

[0003] The current exhaust gas recirculation valve (i.e. EGR valve) applied to automobile (especially hybrid car), its valve body is metal material, the lower part of the valve body and the inner surface of the gas passage of the valve body are also metal material, there is a problem of being corroded by automobile exhaust, the valve rod is designed as an integrated whole, the valve piece is assembled on the valve rod by screw, which affects the stability and smoothness of exhaust gas flow to some extent, and the weight is relatively heavy, the assembly and processing are relatively complicated, in addition, the sealing performance between the valve rod and the valve body is not tight enough, and further improvement is needed. Thus affect the good work of this valve. SUMMARY

[0004] The present application aims to overcome the above-mentioned deficiencies, and provide a corrosion-resistant light-weight exhaust gas recirculation valve with light weight, corrosion-resistant valve body and convenient assembly.

[0005] The purpose of the present application is achieved by the following technical scheme: a corrosion-resistant light-weight exhaust gas recirculation valve, comprising a valve body, an outer cover, a valve rod driving mechanism and a valve rod are installed in the valve body, the valve rod is composed of an upper valve rod and a lower valve rod, a valve piece is installed between the upper valve rod and the lower valve rod, a plastic bushing is installed in the lower part of the valve body and the inner surface of the gas passage of the valve body, and the valve piece is inside the plastic bushing to realize opening or closing.

[0006] The valve rod driving mechanism comprises a motor, a motor gear, a transmission gear and a fan gear in sequence, a return spring is installed on the periphery of the fan gear, the fan gear is connected with the upper valve rod, and the original intermediate connecting piece is omitted. The upper valve rod and the lower valve rod both have grooves, and the both ends of the valve piece are extruded in the grooves (interference fit, no fastener is needed to fix).

[0007] The upper valve rod is provided with upper and lower press sleeves and check rings between the valve body and the upper valve rod at the fan gear position, the upper valve rod is provided with upper and lower bearings and upper Gleason rings between the valve body and the upper valve rod below the fan gear, the lower valve rod is provided with lower Gleason rings and lower bearings between the valve body and the lower valve rod, and the sealing performance of the upper and lower valve rods and the valve body is enhanced. A flange sealing ring is arranged between the outer surface of the exhaust port of the plastic bushing and the valve body to enhance the sealing performance of the plastic bushing and the valve body.

[0008] After the structure of the present application is adopted, the plastic bushing is assembled on the inner surface of the gas passage of the valve body to replace part of the thickness of the gas passage, enhance the corrosion resistance, increase the reliability of the product, split the valve rod into an upper valve rod and a lower valve rod to be connected with the valve disc respectively, omit the original fastener assembly, optimize the gas flow stability of the gas passage, thereby relatively reduce the overall weight of the exhaust gas recirculation valve to achieve the lightweight requirement, continuously enhance the sealing performance through the multi-level sealing element arrangement, and increase the smoothness of the valve rod operation and reduce the probability of valve rod jamming. Therefore, the exhaust gas recirculation valve is ensured to work. BRIEF DESCRIPTION OF DRAWINGS

[0009] The present application will be further described in detail below in combination with the drawings and embodiments.

[0010] Figure 1 The structure of the present application is a corrosion-resistant lightweight exhaust gas recirculation valve.

[0011] Figure 2 The structure of the present application is a corrosion-resistant lightweight exhaust gas recirculation valve. Figure 1 The structure of the present application is a corrosion-resistant lightweight exhaust gas recirculation valve.

[0012] Figure 3 The structure of the present application is a corrosion-resistant lightweight exhaust gas recirculation valve. Figure 1 The structure of the present application is a corrosion-resistant lightweight exhaust gas recirculation valve. DETAILED DESCRIPTION

[0013] Referring to Figures 1 to 3 It can be seen that the present application is applied to a corrosion-resistant lightweight exhaust gas recirculation valve of a hybrid vehicle engine (or a traditional fuel vehicle engine or an engine of engineering machinery), which comprises a valve body 1 and an outer cover 2. A valve rod driving mechanism and a valve rod are arranged in the valve body 1. The valve rod is composed of an upper valve rod 8 (upper position) and a lower valve rod 15 (lower position). A valve disc 10 (also called a disc) is arranged between the upper valve rod 8 and the lower valve rod 15. A plastic bushing 11 (used as a gas passage, assembled by a press fitting process, as shown in Figure 2 , Figure 3 The valve disc 10 is inside the plastic bushing to realize opening or closing (allowing gas to pass through or preventing gas from entering). The upper valve rod 8 (lower end) and the lower valve rod 15 (upper end) both partially penetrate the plastic bushing 11.

[0014] The valve rod driving mechanism 3 comprises a motor 35, a motor gear 31, a transmission gear 32 (and a gear shaft 33), a sector gear 34, a return spring 4 installed on the outer periphery of the sector gear 34 (with a downward extending structure), and the sector gear 34 (with an axis) is connected to the upper valve rod 8 (omitting the original intermediate connecting member). The upper valve rod 8 (with a lower end) and the lower valve rod 15 (with an upper end) are both provided with a groove 12, and the both ends (upper and lower ends) of the valve plate 10 are pressed in the groove 12 (with interference fit fixation, without fastener fixation), which reduces the installation and processing difficulty of multiple components.

[0015] The upper valve rod 8 is provided with a pressure sleeve 5 (upper position) and a stop ring 6 (lower position) between the valve body and the upper valve rod at the sector gear position, and the upper valve rod 8 is provided with an upper bearing 7 (upper position) and an upper Gleason ring 9 (lower position) between the valve body and the upper valve rod below the sector gear, and the lower valve rod 15 is provided with a lower Gleason ring 13 (upper position) and a lower bearing 16 (lower position, and the plug cover 17 at the lowermost part) between the valve body and the lower valve rod, so as to enhance the sealing performance between the upper and lower valve rods and the valve body, and effectively prevent the exhaust gas from entering the valve rod driving mechanism through multi-level sealing arrangement. The flange sealing ring 14 is installed between the outer surface of the exhaust port of the plastic bushing 11 and the valve body 1, so as to enhance the sealing performance between the outer surface of the plastic bushing and the valve body. The outer surface of the plastic bushing 11 is provided with an annular protrusion 21, and the upper Gleason ring 9 and the lower Gleason ring 13 are located at the annular protrusion position, so as to enhance the pressure assembly connection and sealing of the plastic bushing and the gas passage of the valve body.

[0016] The Hall sensor 19 (and the connected circuit board) is installed in the outer cover 2, and the magnet 18 (interacting with the Hall sensor) corresponding to the position of the Hall sensor is installed on the sector gear 34 and close to the top of the upper valve rod 8, so as to accurately sense the rotating speed of the sector gear and the upper valve rod, and accurately control the opening degree (fully open, partially open or closed) of the valve plate.

[0017] As shown in the drawings, the valve rod driving mechanism 3 of the present application works (the motor 35 starts to drive the motor gear 31, the transmission gear 32 and the sector gear 34 to rotate in turn) to drive the upper valve rod 8 and the lower valve rod 15 to rotate, so that the valve plate 10 also rotates to be in an open or closed state in the plastic bushing, so as to make the exhaust gas enter from the air inlet (right end) of the plastic bushing 11 and be discharged from the exhaust port (left end) or be prevented from entering. The multi-level sealing arrangement effectively prevents the exhaust gas (and oil stains, corrosive substances and particulate matters) from entering between the upper and lower parts of the upper and lower valve rods and the valve body (to prevent the valve body and the valve rod from being corroded to cause the valve rod to be stuck), the interior of the valve rod driving mechanism 3, and also increases the smoothness of the valve rod operation and reduces the probability of the valve rod being stuck.

Claims

1. A corrosion resistant light weight exhaust gas recirculation 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 valve stem is composed of an upper valve stem and a lower valve stem, a valve disc is arranged between the upper valve stem and the lower valve stem, a plastic bushing is arranged in the lower part of the valve body and on the inner surface of the gas passage of the valve body, and the valve disc is arranged inside the plastic bushing to realize opening or closing.

2. The corrosion resistant light weight exhaust gas recirculation valve of claim 1, wherein: The valve stem driving mechanism sequentially comprises a motor, a motor gear, a transmission gear and a sector gear, a return spring is arranged on the periphery of the sector gear, and the sector gear is connected with the upper valve stem.

3. The corrosion-resistant, lightweight EGR valve of claim 1 or 2, wherein: The upper valve stem and the lower valve stem are both provided with grooves, and the two end portions of the valve disc are pressed in the grooves.

4. The corrosion-resistant, lightweight EGR valve of claim 1 or 2, wherein: An upper and lower pressing sleeve and a retaining ring are arranged between the valve body and the upper valve stem at the position of the sector gear on the upper valve stem, an upper and lower bearing and an upper retaining ring are arranged between the valve body and the upper valve stem below the sector gear on the upper valve stem, and an upper and lower retaining ring and a lower bearing are arranged between the valve body and the lower valve stem on the lower valve stem.

5. The corrosion resistant, lightweight EGR valve of claim 1, wherein: A flange sealing ring is arranged between the valve body and the outer surface of the exhaust port of the plastic bushing.

6. The corrosion resistant, lightweight EGR valve of claim 1, wherein: A Hall sensor is arranged in the outer cover, and a magnet corresponding to the position of the Hall sensor is arranged on the sector gear and close to the top of the upper valve stem.

7. The corrosion resistant, lightweight EGR valve of claim 4, wherein: The outer surface of the plastic bushing is provided with an annular protrusion, and the upper retaining ring and the lower retaining ring are both arranged at the position of the annular protrusion.

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