Anti-clamping stagnation EGR (Exhaust Gas Recirculation) valve with sealing structure

Abstract

An anti-clamping stagnation EGR valve with a sealing structure is characterized in that a valve rod sub-assembly is arranged in a valve body, the valve rod sub-assembly comprises a valve rod body, a valve rod channel is formed in the valve body, the valve rod body is located in the valve rod channel, a flexible protective sleeve assembly is arranged on the valve rod body, and the flexible protective sleeve assembly comprises an inner protective sleeve, a rubber sleeve body and an outer baffle; the valve rod body penetrates through the center of the inner sheath, the center of the rubber sleeve body and the center of the outer baffle, the inner sheath is connected to the inner end of the rubber sleeve body, and the outer baffle is connected to the outer end of the rubber sleeve body. The outer baffle is in interference fit with the valve rod body; a plurality of sealing bulges are formed on the rubber sleeve body; the gap between the inner wall of the valve rod channel and the valve rod body is sealed through the sealing protrusion so that particulate matter / corrosives can be prevented from penetrating through the gap. Waste gas can be prevented from leaking along the valve rod body to the maximum extent, valve body sealing is achieved, a gas channel is isolated, particulate matter or corrosives are prevented from being accumulated in a gap between the valve rod body and the guide sleeve, carbon deposition is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to an anti-jamming EGR valve with a sealing structure, belonging to the technical field of EGR valves. Background Art

[0002] Currently, the EGR valve in an automotive engine recirculation system typically requires the valve stem to operate under frequent reciprocating motion, depending on the vehicle's varying operating conditions. Engine exhaust contains a large amount of soot, which forms carbon deposits when cooled. This deposit enters the gap between the EGR valve stem and the stem sleeve, increasing wear on the stem and valve body. Excessive deposits can even cause the stem to lock, rendering the EGR valve inoperable. The excessive friction between the stem and valve body caused by carbon deposits hinders the stem's high-speed response time, reducing the efficiency of the recirculation system.

[0003] Furthermore, under certain temperature and humidity conditions, chloride ions in carbon deposits and copper ions in the valve stem sleeve can cause corrosion, leading to valve stem sticking. Carbon deposits between the valve stem and sleeve also generate significant noise. With the widespread adoption of EGR valves in passenger vehicles, increasing customer comfort requirements and improved NVH (Non-Volatile, Harshness, Hurry-Up) characteristics, noise performance parameters are gaining increasing attention. Reducing noise is also a key performance parameter of EGR valves. Therefore, reducing carbon deposits between the EGR valve stem and sleeve to prevent sticking and reduce noise is a challenge that needs to be addressed. Utility Model Content

[0004] To this end, the utility model provides an anti-stuck EGR valve with a sealing structure, which solves the problem of sticking and noise caused by carbon deposits entering the gap between the valve stem and the valve stem sleeve of the EGR valve.

[0005] In order to achieve the above-mentioned object, the utility model provides the following technical solutions: an anti-stuck EGR valve with a sealing structure, comprising a valve body, a valve stem subassembly is provided inside the valve body, the valve stem subassembly comprises a valve stem body, a valve stem channel is formed inside the valve body, the valve stem body is located in the valve stem channel, a valve plate is connected to the end of the valve stem body, a flexible protective sleeve assembly is provided on the valve stem body, the flexible protective sleeve assembly comprises an inner sleeve, a rubber sleeve body and an outer baffle; the valve stem body passes through the center of the inner sleeve, the rubber sleeve body and the outer baffle, the inner sleeve is connected to the inner end of the rubber sleeve body, and the outer baffle is connected to the outer end of the rubber sleeve body; the outer baffle and the valve stem body are interference fit; the rubber sleeve body is formed with a plurality of sealing protrusions;

[0006] The sealing protrusion forms a seal on the gap between the inner wall of the valve stem channel and the valve stem body to prevent particles and corrosion from passing through.

[0007] As a preferred solution for an anti-stuck EGR valve with a sealing structure, a valve stem sleeve is further provided on the outside of the valve stem body, and the valve stem sleeve is located on the inner side of the flexible protective sleeve assembly. The sealing protrusion prevents particulate matter / corrosive substances from passing through and entering the gap between the valve stem sleeve and the valve stem body.

[0008] As a preferred solution for the anti-stuck EGR valve with a sealing structure, a support frame and a grid ring are further provided on the outside of the valve stem body, and the support frame and the grid ring are both sleeved on the periphery of the valve stem body; the support frame is located on the inner side of the valve stem sleeve.

[0009] As a preferred solution for the anti-stuck EGR valve with a sealing structure, the inner sheath is made of stainless steel to support the rubber sheath body.

[0010] As a preferred solution for the anti-stuck EGR valve with a sealing structure, the outer baffle is made of stainless steel; after the outer baffle and the valve stem body are interference-fitted, the outer baffle follows the valve stem body to perform linear reciprocating motion together.

[0011] As a preferred solution for the anti-stuck EGR valve with a sealing structure, the rubber sleeve body is made of rubber material.

[0012] As a preferred solution of the anti-stuck EGR valve with a sealing structure, it also includes a drive assembly, which includes a drive motor, a drive gear, a transmission gear, a swing cam, a guide seat and a linkage bearing;

[0013] The driving gear is connected to the power shaft of the driving motor, the driving gear is meshed with the transmission gear, and the swing cam is coaxially connected to the transmission gear;

[0014] The guide seat is connected to the top of the valve stem body, and the linkage bearing is connected to the guide seat; the swing cam is in contact with the linkage bearing.

[0015] The present invention has the following advantages: a flexible protective sleeve assembly is provided on the valve stem body, comprising an inner sleeve, a rubber sleeve body, and an outer baffle; the valve stem body passes through the center of the inner sleeve, the rubber sleeve body, and the outer baffle, with the inner sleeve connected to the inner end of the rubber sleeve body and the outer baffle connected to the outer end of the rubber sleeve body; the outer baffle and the valve stem body have an interference fit; the rubber sleeve body is formed with a plurality of sealing protrusions; the sealing protrusions seal the gap between the inner wall of the valve stem channel and the valve stem body to prevent particulate matter and corrosive substances from passing through. The present invention can minimize the leakage of exhaust gas along the valve stem body, achieve valve body sealing, isolate the gas channel, prevent the accumulation of particulate matter or corrosive substances in the gap between the valve stem body and the guide sleeve, reduce carbon deposits, and extend service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only exemplary, and those skilled in the art can also derive other implementation drawings based on the provided drawings without inventive effort.

[0017] The structures, proportions, sizes, etc. illustrated in this specification are intended solely to complement the contents disclosed herein and to facilitate understanding and reading by persons skilled in the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in size, provided they do not affect the efficacy and objectives of the present invention, shall remain within the scope of the technical contents disclosed herein.

[0018] Figure 1 A schematic diagram of the three-dimensional structure of an anti-stuck EGR valve with a sealing structure provided in an embodiment of the present utility model;

[0019] Figure 2 A schematic cross-sectional view of an anti-stuck EGR valve with a sealing structure provided in an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the peripheral structure of the valve stem body of the anti-stuck EGR valve with a sealing structure provided in an embodiment of the present invention.

[0021] In the figure, 1. valve body; 2. valve stem subassembly; 3. valve stem body; 4. valve stem channel; 5. valve plate; 6. flexible protective sleeve assembly; 7. inner sleeve; 8. rubber sleeve body; 9. outer baffle; 10. sealing protrusion; 11. valve stem sleeve; 12. support frame; 13. grid ring; 14. drive assembly; 15. drive motor; 16. drive gear; 17. transmission gear; 18. swing cam; 19. guide seat; 20. linkage bearing. DETAILED DESCRIPTION

[0022] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can readily understand the other advantages and benefits of the present invention from the contents disclosed in this specification. Obviously, the embodiments described are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0023] See also Figure 1 、 Figure 2 and Figure 3, the embodiment of the utility model provides an anti-stuck EGR valve with a sealing structure, including a valve body 1, a valve stem subassembly 2 is provided inside the valve body 1, the valve stem subassembly 2 includes a valve stem body 3, a valve stem channel 4 is formed inside the valve body 1, the valve stem body 3 is in the valve stem channel 4, the end of the valve stem body 3 is connected to a valve plate 5, a flexible protective sleeve assembly 6 is provided on the valve stem body 3, the flexible protective sleeve assembly 6 includes an inner sleeve 7, a rubber sleeve body 8 and an outer baffle 9; the valve stem body 3 passes through the center of the inner sleeve 7, the rubber sleeve body 8 and the outer baffle 9, the inner sleeve 7 is connected to the inner end of the rubber sleeve body 8, and the outer baffle 9 is connected to the outer end of the rubber sleeve body 8; the outer baffle 9 and the valve stem body 3 are interference fit; the rubber sleeve body 8 is formed with a plurality of sealing protrusions 10;

[0024] The sealing protrusion 10 seals the gap between the inner wall of the valve stem channel 4 and the valve stem body 3 to prevent particles and corrosive substances from passing through.

[0025] In this embodiment, a stem sleeve 11 is further provided on the exterior of the valve stem body 3. The stem sleeve 11 is located inside the flexible protective sleeve assembly 6. The sealing protrusion 10 prevents particulate matter and corrosive substances from passing through and entering the gap between the stem sleeve 11 and the valve stem body 3. A support frame 12 and a Glyd ring 13 are also provided on the exterior of the valve stem body 3. Both the support frame 12 and the Glyd ring 13 are sleeved around the exterior of the valve stem body 3; the support frame 12 is located inside the stem sleeve 11.

[0026] Specifically, the position of the lower components of the valve stem body 3 is adjusted to prevent exhaust gas and corrosive substances from entering the interior. Specifically, from the perspective of airflow, when the valve stem body 3 moves up and down, the outer baffle 9 and the valve stem body 3 are interference fit to form a whole, and the rubber sleeve body 8 uses a sealing protrusion 10 to contact the inner wall of the valve stem channel 4, thereby ensuring the sealing of the valve stem body 3 and preventing particles or corrosive substances from accumulating in the gap between the valve stem body 3 and the valve stem sleeve 11. This effectively improves the movement jamming of the valve stem body 3, reduces the probability of failure, and extends the service life of the product. At the same time, only minor local improvements to the structure and changes in the order of assembly of parts are required, which will not cause significant cost changes in product manufacturing.

[0027] Among them, the support frame 12 plays a supporting role for the valve stem body 3, and the grid ring 13 serves as a dynamic seal of the support frame 12 to ensure excellent low friction and high-speed performance. There are related technologies themselves, which will not be repeated here.

[0028] In this embodiment, the inner sheath 7 is made of stainless steel to support the rubber sleeve body 8. The inner sheath 7 is made of stainless steel with excellent corrosion resistance and can also serve as a supporting part of the rubber sleeve body 8.

[0029] In this embodiment, the outer baffle 9 is made of stainless steel. After the outer baffle 9 and the valve stem body 3 have an interference fit, the outer baffle 9 follows the valve stem body 3 in linear reciprocating motion. The inner hole of the outer baffle 9 has an interference fit with the valve stem body 3. After being press-fitted together, the outer baffle 9 and the valve stem subassembly 2 achieve linear reciprocating motion together, and the valve stem subassembly 2 is also isolated from the airway.

[0030] In this embodiment, the rubber sleeve body 8 is made of rubber. This ensures that the flexible protective sleeve assembly 6 is not damaged by linear reciprocating motion, while also sealing the valve body 1, isolating the gas passage and preventing the accumulation of particles or corrosive substances in the gap between the valve stem body 3 and the valve stem sleeve 11. The seal is in the form of raised rubber, which provides good sealing performance and requires minimal installation space.

[0031] In this embodiment, a drive assembly 14 is also included, which includes a drive motor 15, a drive gear 16, a transmission gear 17, a swing cam 18, a guide seat 19 and a linkage bearing 20; the drive gear 16 is connected to the power shaft of the drive motor 15, the drive gear 16 and the transmission gear 17 are meshed, and the swing cam 18 and the transmission gear 17 are coaxially connected; the guide seat 19 is connected to the top of the valve stem body 3, and the linkage bearing 20 is connected to the guide seat 19; the swing cam 18 and the linkage bearing 20 are in contact.

[0032] Specifically, the driving motor 15 drives the transmission gear 17 through the driving gear 16. The operation of the transmission gear 17 drives the coaxial swing cam 18 to operate. The swing cam 18 is an eccentric wheel. During operation, it can periodically drive the linkage bearing 20. The linkage bearing 20 drives the valve stem sub-assembly 2 to move up and down, thereby realizing the opening and closing of the valve plate 5 connected to the valve stem body 3.

[0033] To sum up, the utility model includes a valve body 1, a valve stem subassembly 2 is provided inside the valve body 1, the valve stem subassembly 2 includes a valve stem body 3, a valve stem channel 4 is formed inside the valve body 1, and the valve stem body 3 is in the valve stem channel 4; a flexible protective sleeve assembly 6 is provided on the valve stem body 3, and the flexible protective sleeve assembly 6 includes an inner sleeve 7, a rubber sleeve body 8 and an outer baffle 9; the valve stem body 3 passes through the center of the inner sleeve 7, the rubber sleeve body 8 and the outer baffle 9, the inner sleeve 7 is connected to the inner end of the rubber sleeve body 8, and the outer baffle 9 is connected to the outer end of the rubber sleeve body 8; the outer baffle 9 and the valve stem body 3 are interference fit; the rubber sleeve body 8 is formed with a number of sealing protrusions 10; the sealing protrusions 10 form a seal on the gap between the inner wall of the valve stem channel 4 and the valve stem body 3 to prevent particulate matter / corrosive substances from passing through. The position of the lower mounting components of the valve stem body 3 is adjusted to prevent exhaust gas and corrosive substances from entering the interior. Specifically, from the perspective of the airflow direction, when the valve stem body 3 moves up and down, the outer baffle 9 and the valve stem body 3 are interference-fitted to form a whole, and the rubber sleeve body 8 uses a sealing protrusion 10 to contact the inner wall of the valve stem channel 4, ensuring the sealing of the valve stem body 3 and preventing particles or corrosive substances from accumulating in the gap between the valve stem body 3 and the valve stem sleeve 11. This effectively improves the movement stagnation of the valve stem body 3, reduces the probability of malfunction, and extends the service life of the product. At the same time, only minor local improvements to the structure and changes in the order of assembly of parts are required, which will not cause significant cost changes in product manufacturing. The utility model can prevent exhaust gas from leaking along the valve stem body 3 to the greatest extent, realize the sealing of the valve body 1, isolate the gas channel, prevent particles or corrosive substances from accumulating in the gap between the valve stem body 3 and the guide sleeve, reduce carbon deposits, and extend the service life.

[0034] The above description of the present invention is relatively specific and detailed through a general explanation and specific embodiments. It should be understood that, based on the technical concept of the present invention, several conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not deviate from the technical concept of the present invention, the technical solutions obtained by such conventional adjustments or further innovations also fall within the scope of protection of the claims of the present invention.

Claims

1. An anti-stuck EGR valve with a sealing structure, comprising a valve body (1), a valve stem subassembly (2) provided inside the valve body (1), the valve stem subassembly (2) comprising a valve stem body (3), a valve stem channel (4) formed inside the valve body (1), the valve stem body (3) being located in the valve stem channel (4), and a valve plate (5) connected to the end of the valve stem body (3), characterized in that: A flexible protective sleeve assembly (6) is provided on the valve stem body (3), and the flexible protective sleeve assembly (6) includes an inner sleeve (7), a rubber sleeve body (8) and an outer baffle (9); the valve stem body (3) passes through the center of the inner sleeve (7), the rubber sleeve body (8) and the outer baffle (9); the inner sleeve (7) is connected to the inner end of the rubber sleeve body (8), and the outer baffle (9) is connected to the outer end of the rubber sleeve body (8); the outer baffle (9) and the valve stem body (3) are interference-fitted; the rubber sleeve body (8) is formed with a plurality of sealing protrusions (10); The sealing protrusion (10) forms a seal on the gap between the inner wall of the valve stem channel (4) and the valve stem body (3) to prevent particles / corrosive substances from passing through.

2. The anti-stuck EGR valve with a sealing structure according to claim 1, characterized in that: A valve stem sleeve (11) is also provided on the outside of the valve stem body (3), and the valve stem sleeve (11) is located on the inner side of the flexible protective sleeve assembly (6). The sealing protrusion (10) prevents particles / corrosive substances from passing through and entering the gap between the valve stem sleeve (11) and the valve stem body (3).

3. The anti-stuck EGR valve with a sealing structure according to claim 2, characterized in that: The outside of the valve stem body (3) is also provided with a support frame (12) and a grid ring (13), and the support frame (12) and the grid ring (13) are both sleeved on the periphery of the valve stem body (3); the support frame (12) is located on the inner side of the valve stem sleeve (11).

4. The anti-stuck EGR valve with a sealing structure according to claim 2, characterized in that: The inner sheath (7) is made of stainless steel to support the rubber sheath body (8).

5. The anti-stuck EGR valve with a sealing structure according to claim 1, characterized in that: The outer baffle (9) is made of stainless steel; after the outer baffle (9) and the valve stem body (3) are interference-fitted, the outer baffle (9) follows the valve stem body (3) and performs linear reciprocating motion together.

6. The anti-stuck EGR valve with a sealing structure according to claim 1, characterized in that: The rubber sleeve body (8) is made of rubber material.

7. The anti-stuck EGR valve with a sealing structure according to claim 1, characterized in that: The invention also includes a driving assembly (14), wherein the driving assembly (14) includes a driving motor (15), a driving gear (16), a transmission gear (17), a swing cam (18), a guide seat (19) and a linkage bearing (20); The driving gear (16) is connected to the power shaft of the driving motor (15), the driving gear (16) is meshed with the transmission gear (17), and the swing cam (18) and the transmission gear (17) are coaxially connected; The guide seat (19) is connected to the top of the valve stem body (3), and the linkage bearing (20) is connected to the guide seat (19); the swing cam (18) is in contact with the linkage bearing (20).

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