An EGR valve with a lubrication and carbon removal cleaning structure

Abstract

This invention provides an EGR valve with a lubrication and carbon removal cleaning structure, including a valve body, a valve stem, and a lubrication and sealing assembly. The valve body has an exhaust gas passage and a bushing channel. The lubrication and sealing assembly includes a bushing assembly and a spring washer. The middle surface of the valve stem has multiple annular grooves for filling with lubricating material. When the valve stem moves axially, it contacts the bushing assembly through the lubricating material in the annular grooves, thus providing lubrication. The lubricating liquid also fills the tiny gaps between the valve stem and the bushing assembly, reducing the amount of exhaust gas entering the valve body from the bushing channel. The spring washer in the mounting groove is tightly fitted to the valve stem by tension, preventing carbon particles and impurities from entering the valve body. The entire EGR valve has few parts and strong integrity, requiring no multiple parts to work together. Therefore, during operation, it is less likely to malfunction due to misalignment between parts, ensuring sealing performance, improving production efficiency, and facilitating later maintenance.

Description

Technical Field

[0001] This utility model relates to the field of EGR valve technology, and in particular to an EGR valve with a lubrication and carbon removal cleaning structure. Background Technology

[0002] Exhaust Gas Recirculation (EGR) works by introducing a portion of the exhaust gases from the engine into the intake system. This improves combustion performance, reducing NOx formation and emissions, thus decreasing air pollution and improving the atmospheric environment. The EGR cooling technology cools some of the exhaust gases from the engine before returning them to the combustion chamber to mix with fresh air and participate in combustion, effectively reducing NOx emissions.

[0003] However, during prolonged operation, the reciprocating or rotating motion of the EGR valve stem can easily lead to leakage of combustible material along the axial direction and outside the valve body, affecting the normal operation of the valve. Therefore, the valve stem sealing structure in the EGR valve plays a crucial role in preventing leakage. Furthermore, the lack of a lubrication structure for the valve stem inside the EGR valve causes continuous friction between the stem and the housing during movement, affecting the valve stem's lifespan. Existing equipment, due to its complex structure and numerous components, is prone to sealing structure failures during operation, affecting sealing performance and leading to operational instability. Frequent maintenance also increases production costs and reduces economic efficiency.

[0004] Therefore, it is necessary to propose an EGR valve with a lubrication and carbon removal cleaning structure to solve or at least alleviate the above-mentioned defects. Utility Model Content

[0005] The main objective of this invention is to provide an EGR valve with a lubrication and carbon removal cleaning structure to solve the problem that combustion products easily leak along the valve stem axially during operation of the existing EGR valve sealing structure, thus affecting operation.

[0006] To achieve the above objectives, this utility model provides an EGR valve with a lubrication and carbon removal cleaning structure, including a valve body, a valve stem, and a lubrication and sealing assembly; wherein,

[0007] The valve body has an exhaust gas passage and a bushing channel;

[0008] The lubrication and sealing assembly includes a bushing assembly and a spring washer. The bushing assembly is connected to the bushing channel. The valve stem passes through the bushing assembly and is vertically movable. The bottom end of the valve stem is used to seal the air inlet end of the exhaust gas passage. The middle surface of the valve stem is recessed to form multiple annular grooves for filling lubricating material. The multiple annular grooves are spaced apart along the axial direction of the valve stem. The inner wall of the bushing assembly is also provided with an installation groove. The spring washer is connected to the installation groove and attached to the outside of the valve stem.

[0009] Preferably, the bushing assembly includes a first bushing and a second bushing, both of which are installed in the bushing channel, with the first bushing connected above the second bushing, and the bottom end of the second bushing recessed to form the mounting groove.

[0010] Preferably, the second bushing is stepped, including an upper step and a lower step, the outer diameter of the upper step being larger than the outer diameter of the lower step, and the bushing channel is stepped and matched to the bushing assembly.

[0011] Preferably, the valve body includes a valve seat and a valve cover, the valve cover being sealed above the valve seat, and the exhaust gas passage being formed in the valve seat.

[0012] Preferably, the valve seat also includes a spring and a tapered connector. The top of the valve seat and the bottom of the valve cover are provided with internal cavities. The tapered connector is connected to the top of the valve stem. The bottom end of the spring is connected to the valve seat and sleeved on the outer wall of the bushing channel. The top end of the spring is connected to the tapered connector.

[0013] Preferably, the device further includes a piston, a plug seal, and a sealing ring. The piston is disposed between the conical joint and the inner top wall of the valve cover. The plug seal is fitted between the top of the piston and the inner side wall of the valve cover. A sealing groove is also provided at the bottom of the piston, and the sealing ring is connected to the sealing groove.

[0014] Preferably, the spring pad is arc-shaped.

[0015] Preferably, the number of annular grooves is three, and the three annular grooves are arranged at intervals along the axial direction of the valve stem.

[0016] Preferably, the second bushing and the valve seat are interference-fitted.

[0017] Preferably, the lubricating material filled in each of the annular grooves is a high-temperature resistant lubricating grease.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention provides an EGR valve with a lubrication and carbon removal cleaning structure, comprising a valve body, a valve stem, and a lubrication sealing assembly. The valve body has an exhaust gas passage and a bushing channel. The lubrication sealing assembly includes a bushing assembly and a spring washer. The bushing assembly is connected to the bushing channel. The valve stem passes through the bushing assembly and is vertically movable. The bottom end of the valve stem is used to seal the inlet end of the exhaust gas passage. The middle surface of the valve stem is recessed to form multiple annular grooves for filling lubricating material. The multiple annular grooves are spaced apart along the axial direction of the valve stem. The inner wall of the bushing assembly is also provided with an installation groove. The spring washer is connected to the installation groove and attached to the outside of the valve stem. When the valve stem moves axially, it comes into contact with the bushing assembly through the lubricating material on the annular groove, which not only lubricates the valve but also fills the tiny gaps between the valve stem and the bushing assembly under the action of the lubricating liquid, reducing the amount of exhaust gas entering the valve body through the bushing orifice. The spring pad in the mounting groove is tightly fitted to the valve stem by tension, preventing carbon particles and impurities from entering the valve body. The entire EGR valve has fewer parts and stronger integrity, and does not require the coordinated movement of multiple parts. Therefore, it is not easy for the valve to malfunction due to failure in the coordination between parts during operation, thus ensuring sealing performance and improving production efficiency. Its subsequent maintenance is also simpler and more convenient. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional schematic diagram of the overall structure in one embodiment of the present utility model;

[0022] Figure 2 This is a cross-sectional schematic diagram of the valve in the closed state of the overall structure in one embodiment of the present invention;

[0023] Figure 3 This is a cross-sectional schematic diagram of the overall structure in the state of exhaust gas flow in one embodiment of this utility model;

[0024] Figure 4 for Figure 2 A magnified view of a portion of point A in the middle.

[0025] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0026] Explanation of icon numbers:

[0027] 10. Valve body; 110. Valve seat; 111. Exhaust gas passage; 112. Bushing channel; 120. Valve cover; 121. Internal cavity; 130. Spring; 140. Tapered joint; 150. Piston; 160. Plug seal; 170. Sealing ring; 20. Valve stem; 210. Annular groove; 30. Lubrication and sealing assembly; 310. Bushing assembly; 311. First bushing; 312. Second bushing; 320. Spring washer. Detailed Implementation

[0028] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0031] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0032] Please see the appendix Figure 1-4 An embodiment of the present invention provides an EGR valve with a lubrication and carbon removal cleaning structure, comprising a valve body 10, a valve stem 20, and a lubrication and sealing assembly 30, the specific details of which are as follows:

[0033] The valve body 10 has an exhaust gas passage 111 and a bushing channel 112; the lubrication and sealing assembly 30 includes a bushing assembly 310 and a spring washer 320. The bushing assembly 310 is connected in the bushing channel 112. The valve stem 20 passes through the bushing assembly 310 and is vertically movable. The bottom end of the valve stem 20 is used to seal the air inlet end of the exhaust gas passage 111. The middle surface of the valve stem 20 is recessed to form a plurality of annular grooves 210 for filling lubricating material. The plurality of annular grooves 210 are spaced apart along the axial direction of the valve stem 20. The inner wall of the bushing assembly 310 is also provided with an installation groove. The spring washer 320 is connected in the installation groove and attached to the outside of the valve stem 20.

[0034] Specifically, the EGR valve with lubrication and carbon removal cleaning structure in this application includes a valve body 10, a valve stem 20, and a lubrication sealing assembly 30. The valve body 10 is the main body of the EGR valve, which typically includes a valve seat 110 and a valve cover 120. The valve seat 110 is used for exhaust gas flow and has an exhaust gas passage 111 inside that introduces part of the exhaust gas discharged from the engine into the intake system. The valve stem 20 moves along its own axial direction (vertically as shown in the figure) to open / close the exhaust gas passage 11. 1. Therefore, the bottom end of the valve stem 20 is used to seal the inlet end of the exhaust gas passage 111. When the valve stem 20 moves downward, a gap is generated between the valve stem 20 and the valve seat 110, allowing exhaust gas to enter from the inlet end of the exhaust gas passage 111 (bottom end of the valve seat 110) and then flow out from the outlet end of the exhaust gas passage 111. The valve cover 120 is used to seal the top of the valve seat 110 to prevent dust, impurities, moisture, etc. from flowing into the interior of the valve seat 110. Furthermore, it also includes a spring 130 and a conical... The valve seat 110 and the valve cover 120 are both provided with internal cavities 121. The internal cavity 121 of the valve cover 120 serves as the moving space for the spring 130 and the conical connector 140. The internal cavity 121 of the valve seat 110 is used for the installation of the spring 130. The conical connector 140 is connected to the top of the valve stem 20. The bottom end of the spring 130 is connected to the valve seat 110 and sleeved on the outer wall of the bushing channel 112. The top end of the spring 130 is connected to the conical connector 140. In this way, when the exhaust gas passage 111 needs to be closed after the exhaust gas flows into the intake system, the elastic action of the spring 130 can better seal the bottom end of the exhaust gas passage 111, thereby ensuring the normal operation of the engine. The lubrication and sealing assembly 30 is used to improve air tightness and prevent carbon deposits from entering the valve seat 110 while lubricating the movement of the valve stem 20.

[0035] The lubrication and sealing assembly 30 includes a bushing assembly 310 and a spring washer 320. The bushing assembly 310 is used for the valve stem 20 to pass through, thereby serving as a guide and seal. Therefore, to facilitate the installation of the bushing assembly 310, a bushing channel 112 is provided in the valve seat 110 so that the bushing assembly 310 is connected in the bushing channel 112. To further optimize the effect of the bushing assembly 310, multiple annular grooves 210 are recessed on the middle surface of the valve stem 20. The annular grooves 210 are used to fill lubricating material, so that the valve stem 20 moves along the axial direction... During sliding, the lubrication material enhances the lubrication. It is understood that the lubricating material is usually an oil-based liquid. Therefore, in addition to lubrication, the oil-based liquid can also fill the tiny gaps between the valve stem 20 and the bushing assembly 310 to further prevent exhaust gas from flowing into the valve cover 120 through the bushing channel 112. The oil-based liquid also has a certain viscosity resistance, so the exhaust gas has to overcome a lot of resistance to pass through this oil-based liquid, thereby achieving better lubrication and sealing performance. In a preferred embodiment of this application, the lubricating material can be a high-temperature resistant lubricating grease, which can also better adapt to the high-temperature working environment in the EGR valve.

[0036] Furthermore, the inner wall of the bushing assembly 310 is provided with an installation groove for the installation of the spring pad 320. The spring pad 320 is tightly fitted with the valve stem 20 by tension, which can prevent carbon particles and impurities generated by long-term working exhaust gas from entering the valve body 10. When the exhaust gas passes through the exhaust gas channel 111, if the particles generated by the gas adhere to the valve stem 20, they will be scraped off by the spring pad 320 as the valve stem 20 moves axially, thereby achieving the effect of cleaning carbon particles and avoiding the failure of the valve stem 20 and the bushing assembly 310 seizing each other due to carbon deposits, thus extending the service life of the EGR valve. Preferably, the spring pad 320 can be an arc-shaped spring pad 320 to form an inclined surface, which can better scrape off the carbon particles on the valve stem 20 and improve the particle cleaning effect of the spring pad 320.

[0037] In a preferred embodiment of the present invention, the bushing assembly 310 includes a first bushing 311 and a second bushing 312. Both the first bushing 311 and the second bushing 312 are installed in the bushing channel 112, and the first bushing 311 is connected above the second bushing 312. The bottom end of the second bushing 312 is recessed to form the mounting groove.

[0038] It should be noted that the first bushing 311 can be made of graphite material to have a self-lubricating effect. The second bushing 312 is used to open the mounting groove to facilitate the installation of the spring pad 320. The bottom end of the second bushing 312 extends close to the exhaust gas passage 111 so that when the spring pad 320 is installed at the bottom end of the second bushing 312, it is located close to the exhaust gas passage 111. This allows the carbon particles adhering to the valve stem 20 to be scraped off from the bottom end of the bushing passage 112, improving the carbon removal efficiency, reducing the time adhering to the valve stem 20, and improving the sliding efficiency of the valve stem 20.

[0039] In a preferred embodiment of the present invention, the second bushing 312 is stepped, including an upper step and a lower step, wherein the outer diameter of the upper step is larger than the outer diameter of the lower step, and the bushing channel 112 is stepped and matched with the bushing assembly 310.

[0040] It should be noted that this step-shaped form, which is wider at the top and narrower at the bottom, creates a mutual abutting effect with the bushing channel 112, which is also step-shaped. When the valve stem 20 moves downward with the tapered joint 140 and the spring 130, the step can be stopped and provide support when it is pressed to the bottom.

[0041] Furthermore, it also includes a piston 150, a plug seal 160, and a sealing ring 170. The piston 150 is disposed between the conical joint 140 and the inner top wall of the valve cover 120. The plug seal 160 is sealed between the top of the piston 150 and the inner side wall of the valve cover 120. A sealing groove is also provided at the bottom of the piston 150, and the sealing ring 170 is connected in the sealing groove.

[0042] It should be noted that the main function of piston 150 is to control the flow rate of exhaust gas recirculation through its movement. When piston 150 moves, it changes the opening of the internal passage of EGR valve, thereby regulating the amount of exhaust gas entering the intake system. Therefore, piston 150 is located between the conical joint 140 and the inner top wall of valve cover 120. When piston 150 moves downward, it pushes conical joint 140 and compresses spring 130 to drive valve stem 20 downward, opening the exhaust gas passage 111 of EGR valve and allowing exhaust gas to enter the intake system. When it is necessary to close the exhaust gas passage 111 of EGR valve, piston 150 stops pushing and moves upward under the elastic action of spring 130, preventing exhaust gas from entering the intake system. The plug seal 160 and sealing ring 170 are used to prevent gas from entering the interior of valve seat 110, thus playing a sealing role.

[0043] Furthermore, the number of annular grooves 210 is three, and the three annular grooves 210 are arranged at intervals along the axial direction of the valve stem 20.

[0044] It should be noted that the more annular grooves 210 there are, the more filling surface there is for the high-temperature resistant lubricating grease. Considering the processing cost and the fact that the structure should not have too many holes, it is preferable that the number of annular grooves 210 is three. Those skilled in the art can also select the specific number according to actual needs.

[0045] Furthermore, the second bushing 312 is interference-fitted with the valve seat 110.

[0046] It should be noted that interference fit can increase tight contact to improve sealing performance, as well as enhance structural strength and improve positional accuracy.

[0047] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An EGR valve having a lubrication and carbon cleaning structure, characterized by, This includes the valve body, valve stem, and lubrication and sealing components; among which, The valve body has an exhaust gas passage and a bushing channel; The lubrication and sealing assembly includes a bushing assembly and a spring washer. The bushing assembly is connected to the bushing channel. The valve stem passes through the bushing assembly and is vertically movable. The bottom end of the valve stem is used to seal the air inlet end of the exhaust gas passage. The middle surface of the valve stem is recessed to form multiple annular grooves for filling lubricating material. The multiple annular grooves are spaced apart along the axial direction of the valve stem. The inner wall of the bushing assembly is also provided with an installation groove. The spring washer is connected to the installation groove and is attached to the outside of the valve stem.

2. The EGR valve having a lubrication and carbon cleaning structure according to claim 1, characterized by, The bushing assembly includes a first bushing and a second bushing, both of which are installed in the bushing channel, with the first bushing connected above the second bushing, and the bottom end of the second bushing recessed to form the mounting groove.

3. The EGR valve having a lubrication and carbon cleaning structure according to claim 2, characterized by, The second bushing is stepped, including an upper step and a lower step, wherein the outer diameter of the upper step is larger than the outer diameter of the lower step, and the bushing channel is stepped and matched to the bushing assembly.

4. The EGR valve having a lubrication and carbon cleaning structure according to claim 2, characterized by, The valve body includes a valve seat and a valve cover, the valve cover being sealed and connected above the valve seat, and the exhaust gas passage being formed in the valve seat.

5. The EGR valve having a lubrication and carbon cleaning structure according to claim 4, characterized by, It also includes a spring and a tapered connector. The top of the valve seat and the bottom of the valve cover are provided with internal cavities. The tapered connector is connected to the top of the valve stem. The bottom end of the spring is connected to the valve seat and sleeved on the outer wall of the bushing channel. The top end of the spring is connected to the tapered connector.

6. The EGR valve with a lubrication and carbon removal cleaning structure according to claim 5, characterized in that, It also includes a piston, a plug seal, and a sealing ring. The piston is disposed between the conical joint and the inner top wall of the valve cover. The plug seal is fitted between the top of the piston and the inner side wall of the valve cover. A sealing groove is also provided at the bottom of the piston, and the sealing ring is connected to the sealing groove.

7. The EGR valve with lubrication and decarbonizing cleaning structure according to claim 1, characterized by, The spring pad is bow-shaped.

8. The EGR valve with lubrication and decarbonizing cleaning structure according to claim 1, characterized by, The number of annular grooves is three, and the three annular grooves are arranged at intervals along the axial direction of the valve stem.

9. The EGR valve having a lubrication and decarbon cleaning structure according to claim 4, characterized by, The second bushing is interference-fitted with the valve seat.

10. The EGR valve having a lubrication and decarbon cleaning structure according to claim 1, characterized by, The lubricating material filled in each of the annular grooves is a high-temperature resistant lubricating grease.

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