Sealing and clamping stagnation preventing structure of EGR (Exhaust Gas Recirculation) valve

Abstract

The sealing and clamping stagnation preventing structure comprises a lower valve body, a valve seat, a valve rod, a driving module and a motor, the top end of the lower valve body is connected with the bottom end of the valve seat, the valve rod is arranged in the lower valve body and the valve seat in a sliding mode, and a sealing assembly is installed between the valve rod and the lower valve body; the driving module is connected with the top end of the valve rod and connected with the motor. The sealing assembly comprises a sealing ring seat, and a fixing block, a scraping piece, a middle gasket, a sealing ring, a guide sleeve and a fixing gasket are sequentially arranged on the inner cylinder portion of the sealing ring seat from bottom to top. According to the EGR valve, the scraping piece is arranged in the sealing assembly, and the sealing ring and the valve rod are sealed in a spring sealing mode, so that the problem that the valve body is poor in sealing performance and waste gas is easily adsorbed on the valve rod to cause clamping stagnation is solved, the clamping stagnation condition in the movement of the valve rod is effectively improved, the failure probability of the EGR valve is reduced, and the service life of the EGR valve is prolonged. And the service life of the product is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of valve bodies, in particular to a sealing and anti-jamming structure of an EGR valve. Background Art

[0002] Exhaust gas recirculation system, referred to as EGR, is a low-cost, minimally modified internal combustion engine that can effectively reduce NO X The emission control measures have been more and more widely used in the field of internal combustion engine emission control. The electric EGR valve can reintroduce a proper amount of engine combustion exhaust gas into the intake pipe, mix it with fresh air and enter the cylinder for secondary combustion, which reduces the temperature in the cylinder during combustion. Since NOx is generated under high temperature and rich oxygen conditions, the generation of NOx is suppressed.

[0003] The EGR valves currently available on the market have problems with drive system failure and valve stem sticking. The main reason is that the sealing components that block the gas channel and the drive system fail, causing the exhaust gas in the gas channel to penetrate into the valve stem and guide sleeve and enter the drive system, causing the drive system to fail. At the same time, the soot particles and impurities that penetrate into the valve stem and guide sleeve will be adsorbed on the valve stem, causing the valve stem to corrode and fail due to sticking, thus limiting the service life of the EGR valve. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a sealing and anti-jamming structure of an EGR valve, which can solve the problem of jamming caused by poor sealing of the valve body and easy adsorption of exhaust gas on the valve stem.

[0005] In order to solve the above technical problems, the technical solutions adopted by the present utility model are as follows.

[0006] A sealing and anti-stuck structure of an EGR valve, comprising a lower valve body, a valve seat, a valve stem, a drive module, and a motor, wherein the top end of the lower valve body is connected to the bottom end of the valve seat, the valve stem is slidably arranged in the lower valve body and the valve seat, and a sealing assembly is installed between the valve stem and the lower valve body; the drive module is connected to the top end of the valve stem, and the drive module is connected to the motor; the sealing assembly comprises a sealing ring seat, and the inner cylinder of the sealing ring seat is sequentially provided with a fixed block, a scraper, an intermediate gasket, a sealing ring, a guide sleeve, and a fixed gasket from bottom to top, and the fixed block and the fixed gasket are respectively welded to the bottom and top end of the sealing ring seat.

[0007] In the above-mentioned sealing and anti-jamming structure of the EGR valve, a stepped hole for accommodating the scraper is arranged at the center of the top of the fixed block, the height of the stepped hole is greater than the thickness of the scraper, and the diameter of the stepped hole is greater than the outer wall diameter of the scraper.

[0008] The sealing and anti-jamming structure of the above-mentioned EGR valve is characterized in that a movable gap is provided between the inner wall of the scraper and the outer wall of the valve stem, the gap between the stepped hole and the outer wall of the scraper is larger than the movable gap between the scraper and the outer wall of the valve stem, and the gap between the stepped hole and the outer wall of the scraper is larger than the swinging gap between the outer wall of the valve stem and the guide sleeve.

[0009] The sealing and anti-stuck structure of the above-mentioned EGR valve adopts a universal seal, and the sealing ring is composed of an inverted U-shaped sealing shell and a V-shaped corrosion-resistant spring. The inverted U-shaped sealing shell presses the sealing lip against the valve stem through the clamping force of the V-shaped corrosion-resistant spring on the inner wall. At the same time, the sealing lip of the inverted U-shaped sealing shell is tightly set against the sealing ring seat under the tension of the V-shaped corrosion-resistant spring.

[0010] In the above-mentioned sealing and anti-stuck structure of the EGR valve, the middle and lower parts of the valve stem are respectively provided with an upper valve plate and a lower valve plate for sealing the valve port on the lower valve body, and a buffer gap A is provided between the upper valve plate and the bottom of the sealing assembly.

[0011] In the above-mentioned sealing and anti-jamming structure of the EGR valve, a driving cavity for accommodating the driving module is arranged on the top of the valve seat, and the driving cavity is sealed by a cover installed on the valve seat.

[0012] In the above-mentioned sealing and anti-stuck structure of the EGR valve, the sealing ring seat in the sealing assembly is installed on the lower valve body by interference fit.

[0013] The sealing and anti-stuck structure of the above-mentioned EGR valve, the sealing ring seat in the sealing assembly and the lower valve body are integrally formed by a mold, and the installation space inside the sealing ring seat to accommodate the fixed block, the intermediate gasket, the sealing ring, the guide sleeve and the fixed gasket is formed by machining.

[0014] Due to the adoption of the above technical scheme, the technical progress achieved by the present invention is as follows.

[0015] The utility model provides a sealing and anti-stuck structure of the EGR valve, by arranging a scraper in the sealing component, the airflow enters the sealing component and impacts the scraper, so that the scraper and the valve stem move relatively, and the carbon deposits and other particles in the exhaust gas are scraped off by the friction force, and at the same time, the sealing ring and the valve stem are sealed by a pan-plug sealing method, so that the carbon smoke entering the sealing ring is effectively blocked, and the carbon smoke is prevented from entering the gap between the guide sleeve and the valve stem and accumulating on the surface of the valve stem to cause the valve stem to be stuck, which solves the problem of sticking caused by poor sealing of the valve body and easy adsorption of exhaust gas on the valve stem, effectively improves the sticking situation in the movement of the valve stem, reduces the probability of EGR valve failure, and prolongs the service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1This is a schematic diagram of the specific structure of the first embodiment of the utility model;

[0017] Figure 2 This is a schematic diagram of the specific structure of the sealing assembly in the first embodiment of the utility model;

[0018] Figure 3 This is a schematic diagram of the specific structure of the second embodiment of the utility model;

[0019] Figure 4 for Figure 3 Schematic diagram of the local structure in.

[0020] Among them: 1. Lower valve body, 2. Sealing assembly, 201. Sealing ring seat, 202. Fixed block, 203. Scraper, 204. Intermediate gasket, 205. Sealing ring, 206. Guide sleeve, 207. Fixed gasket, 208. V-shaped corrosion-resistant spring, 3. Valve seat, 4. Valve stem, 5. Drive module, 6. Cover, 7. Motor, 8. Upper valve plate, 9. Lower valve plate. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods. Embodiment 1

[0022] A sealing and anti-stuck structure of an EGR valve, such as Figure 1 to Figure 2 As shown, it includes a lower valve body 1, a valve seat 3, a valve stem 4, a driving module 5, and a motor 7. The top end of the lower valve body 1 is connected to the bottom end of the valve seat 3, the valve stem 4 is slidably arranged in the lower valve body 1 and the valve seat 3, a sealing assembly 2 is installed between the valve stem 4 and the lower valve body 1, the driving module 5 is connected to the top end of the valve stem 4, and the driving module 5 is connected to the motor 7.

[0023] A driving cavity for accommodating a driving module 5 is provided on the top of the valve seat 3. The driving cavity is sealed by a cover 6 installed on the valve seat 3. The driving module 5 is an existing structure, which mainly drives the valve stem 4 to lift and lower to control the opening and closing of the valve port, and will not be described in detail here.

[0024] The middle and lower parts of the valve stem 4 are respectively provided with an upper valve plate 8 and a lower valve plate 9 for sealing the valve opening on the lower valve body 1. A buffer gap A is provided between the upper valve plate 8 and the bottom of the sealing component 2. When the exhaust gas passes through the valve opening corresponding to the upper valve plate 8, it will be buffered in the buffer gap A, and the exhaust gas will not directly impact the sealing component 2.

[0025] The sealing assembly comprises a sealing ring seat 201 , and the inner cylinder of the sealing ring seat 201 is provided with a fixing block 202 , a scraper 203 , an intermediate gasket 204 , a sealing ring 205 , a guide sleeve 206 , and a fixing gasket 207 in sequence from bottom to top.

[0026] The sealing ring seat 201 is installed on the lower valve body 1 by means of interference fit, which can avoid reopening the mold and reduce product manufacturing costs.

[0027] The fixing block 202 and the fixing gasket 207 are welded to the bottom end and the top end of the sealing ring seat 201 respectively.

[0028] A stepped hole for accommodating the scraper 203 is provided at the center of the top of the fixed block 202. The height of the stepped hole is greater than the thickness of the scraper 203, and the diameter of the stepped hole is greater than the outer wall diameter of the scraper 203, so that the scraper 203 can move horizontally or vertically in the stepped hole.

[0029] A movable gap is set between the inner wall of the scraper 203 and the outer wall of the valve stem 4, the gap between the stepped hole and the outer wall of the scraper 203 is larger than the movable gap between the scraper 203 and the outer wall of the valve stem 4, and the gap between the stepped hole and the outer wall of the scraper 203 is larger than the swing gap between the outer wall of the valve stem 4 and the guide sleeve 206.

[0030] When the exhaust gas enters the bottom of the sealing component 2, the exhaust gas impacts the scraper, causing the scraper 203 to move up and down with the valve stem 4, thereby peeling off the carbon deposits and impurities on the surface of the valve stem 4, preventing the carbon deposits and other particles in the exhaust gas from continuing to move upward, and performing preliminary filtering on the exhaust gas.

[0031] The filtered exhaust gas passes through the middle gasket 203 and enters the end position of the sealing ring 205. The sealing ring 205 adopts a universal seal. The sealing ring 205 consists of an inverted U-shaped sealing shell and a V-shaped corrosion-resistant spring 208. The inverted U-shaped sealing shell presses the sealing lip against the valve stem 4 through the clamping force of the V-shaped corrosion-resistant spring on the inner wall. At the same time, the sealing lip of the inverted U-shaped sealing shell is set tightly against the sealing ring seat 201 under the tension of the V-shaped corrosion-resistant spring.

[0032] When the valve stem 4 moves up and down, the airflow impacts the V-shaped corrosion-resistant spring 208. Under the action of the V-shaped corrosion-resistant spring, the sealing ring 205 and the valve stem 4 wipe off the carbon soot adsorbed on the surface of the valve stem 4 through friction, preventing the carbon soot from entering the gap between the guide sleeve 206 and the valve stem 4, and avoiding the long-term accumulation of the gas on the valve stem surface, causing the valve stem 4 to corrode and get stuck. Embodiment 2

[0033] Based on the first embodiment, Figure 3 to Figure 4 As shown, the sealing ring seat 201 in the sealing assembly 2 is integrally formed with the lower valve body 1 by a mold, and the installation space inside the sealing ring seat 201 that accommodates the fixed block 202, the middle gasket 204, the sealing ring 205, the guide sleeve 206 and the fixed gasket 207 is formed by machining.

[0034] This processing method is suitable for the case where the lower valve body 1 is re-molded. By finely processing the interior of the sealing ring seat 201 in the lower valve body 1, assembly errors can be reduced, part accuracy can be guaranteed, and valve reliability can be improved.

[0035] The utility model provides a sealing and anti-stuck structure of the EGR valve, by arranging a scraper in the sealing component, the airflow enters the sealing component and impacts the scraper, so that the scraper and the valve stem move relatively, and the carbon deposits and other particles in the exhaust gas are scraped off by the friction force, and at the same time, the sealing ring and the valve stem are sealed by a pan-plug sealing method, so that the carbon smoke entering the sealing ring is effectively blocked, and the carbon smoke is prevented from entering the gap between the guide sleeve and the valve stem and accumulating on the surface of the valve stem to cause the valve stem to be stuck, which solves the problem of sticking caused by poor sealing of the valve body and easy adsorption of exhaust gas on the valve stem, effectively improves the sticking situation in the movement of the valve stem, reduces the probability of EGR valve failure, and prolongs the service life of the product.

Claims

1. A sealing and anti-jamming structure of an EGR valve, comprising a lower valve body (1), a valve seat (3), a valve stem (4), a drive module (5), and a motor (7), wherein the top end of the lower valve body (1) is connected to the bottom end of the valve seat (3), the valve stem (4) is slidably arranged in the lower valve body (1) and the valve seat (3), and a sealing component (2) is installed between the valve stem (4) and the lower valve body (1); the drive module (5) is connected to the top end of the valve stem (4), and the drive module (5) is connected to the motor (7); and the characteristics are: The sealing assembly comprises a sealing ring seat (201), wherein the inner cylinder portion of the sealing ring seat (201) is provided with a fixing block (202), a scraper (203), an intermediate gasket (204), a sealing ring (205), a guide sleeve (206), and a fixing gasket (207) in sequence from bottom to top, and the fixing block (202) and the fixing gasket (207) are respectively welded to the bottom end and the top end of the sealing ring seat (201).

2. The sealing and anti-stuck structure of an EGR valve according to claim 1, characterized in that: A stepped hole for accommodating the scraper (203) is provided at the center of the top end of the fixed block (202); the height of the stepped hole is greater than the thickness of the scraper (203); and the diameter of the stepped hole is greater than the outer wall diameter of the scraper (203).

3. The sealing and anti-stuck structure of an EGR valve according to claim 2, characterized in that: A movable gap is provided between the inner wall of the scraper (203) and the outer wall of the valve stem (4); the gap between the stepped hole and the outer wall of the scraper (203) is larger than the movable gap between the scraper (203) and the outer wall of the valve stem (4); and the gap between the stepped hole and the outer wall of the scraper (203) is larger than the swing gap between the outer wall of the valve stem (4) and the guide sleeve (206).

4. The sealing and anti-stuck structure of an EGR valve according to claim 1, characterized in that: The sealing ring (205) adopts a universal seal. The sealing ring (205) is composed of an inverted U-shaped sealing shell and a V-shaped corrosion-resistant spring (208). The inverted U-shaped sealing shell presses the sealing lip against the valve stem (4) through the clamping force of the V-shaped corrosion-resistant spring on the inner wall. At the same time, the sealing lip of the inverted U-shaped sealing shell is set tightly against the sealing ring seat (201) under the tension of the V-shaped corrosion-resistant spring.

5. The sealing and anti-stuck structure of an EGR valve according to claim 1, characterized in that: An upper valve plate (8) and a lower valve plate (9) for sealing the valve opening on the lower valve body (1) are respectively arranged at the middle and lower parts of the valve stem (4), and a buffer gap A is arranged between the upper valve plate (8) and the bottom of the sealing assembly (2).

6. The sealing and anti-stuck structure of an EGR valve according to claim 1, characterized in that: A driving cavity for accommodating a driving module (5) is provided on the top of the valve seat (3), and the driving cavity is sealed by a cover (6) mounted on the valve seat (3).

7. The sealing and anti-stuck structure of an EGR valve according to claim 1, characterized in that: The sealing ring seat (201) in the sealing assembly (2) is installed on the lower valve body (1) by means of interference fit.

8. The sealing and anti-stuck structure of an EGR valve according to claim 1, characterized in that: The sealing ring seat (201) in the sealing assembly (2) is integrally formed with the lower valve body (1) by means of a mold, and the installation space inside the sealing ring seat (201) for accommodating the fixing block (202), the intermediate gasket (204), the sealing ring (205), the guide sleeve (206) and the fixing gasket (207) is formed by machining.

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