EGR (Exhaust Gas Recirculation) valve with lubricating and decarbonizing cleaning structure

Abstract

The EGR valve with the lubricating and decarbonizing cleaning structure comprises a valve body, a valve rod and a lubricating sealing assembly, the valve body is provided with a waste gas channel and a lining hole channel, the lubricating sealing assembly comprises a lining assembly and a spring washer, and the surface of the middle of the valve rod is sunken to form a plurality of annular grooves used for being filled with lubricating materials. In this way, when the valve rod makes contact with the lining assembly through the lubricating material on the annular groove during axial movement, lubrication can be achieved, a tiny gap between the valve rod and the lining assembly can be filled under the effect of lubricating liquid, waste gas entering the valve body from a lining hole channel is reduced, the spring washer in the installation groove is tightly matched with the valve rod through tensioning force, and the service life of the valve rod is prolonged. According to the EGR valve, carbon deposition particles and impurities are prevented from entering the valve body, the whole EGR valve is few in part and high in integrity, cooperation of multiple parts is not needed, therefore, operation faults of the selector valve caused by cooperation faults of the parts in the operation process are not likely to happen, the sealing performance is guaranteed, the production efficiency is improved, and later maintenance is convenient and fast.

Description

Technical Field

[0001] The present invention relates to the technical field of EGR valves, in particular to an EGR valve with a lubrication and carbon removal cleaning structure. Background Art

[0002] The basic principle of Exhaust Gas Recirculation (EGR) is to introduce some of the engine's exhaust into the intake system, thereby improving combustion performance, reducing NOx formation and waste emissions, reducing air pollution, and improving the atmospheric environment. This cooling technology involves cooling some of the exhaust gas from the vehicle engine through an EGR cooler before returning it to the engine's combustion chamber to mix with fresh air for combustion, effectively reducing nitrogen oxide (NOx) emissions.

[0003] However, during extended operation, the EGR valve stem undergoes reciprocating or rotating motion, which can easily cause combustion products to leak along the axis and out of the valve body, affecting the valve's normal operation. Therefore, the stem sealing structure in the EGR valve plays a crucial role in preventing leakage. Furthermore, the lack of a stem lubrication mechanism within the EGR valve causes the stem to constantly rub against the housing during movement, impacting its service life. Existing equipment, due to its complex structure and numerous components, is prone to sealing failures during operation, affecting sealing performance and leading to unstable operation. Frequent maintenance also increases production and processing costs, reducing economic benefits.

[0004] In view of this, 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. Summary of the Invention

[0005] The main purpose of the present invention is to provide an EGR valve with a lubricating and carbon removal cleaning structure to solve the problem that the combustion products of the EGR valve sealing structure in the prior art easily leak along the axial direction of the valve stem during operation, thereby affecting operation.

[0006] To achieve the above-mentioned purpose, the present invention provides an EGR valve with a lubricating and carbon removal cleaning structure, comprising a valve body, a valve stem and a lubricating sealing assembly; wherein,

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

[0008] The lubricating 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 movably arranged vertically. The bottom end of the valve stem is used to seal the intake end of the exhaust gas channel. The middle surface of the valve stem is recessed to form a plurality of annular grooves for filling lubricating material. The plurality of annular grooves are arranged at intervals 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 outer side of the valve stem.

[0009] Preferably, the bushing assembly includes a first bushing and a second bushing, the first bushing and the second bushing are both installed in the bushing channel, and the first bushing is connected to the top of the second bushing, and the bottom end of the second bushing is recessed to form the installation groove.

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

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

[0012] Preferably, it also includes a spring and a conical joint, the top of the valve seat and the bottom of the valve cover are both provided with an internal cavity, the conical joint is connected to the top of the valve stem, the bottom end of the spring is connected to the valve seat and is sleeved on the outer side wall of the bushing channel, and the top end of the spring is connected to the conical joint.

[0013] Preferably, it also includes a piston, a pan-seal and a sealing ring. The piston is arranged between the conical joint and the inner top wall of the valve cover. The pan-seal sealing sleeve is arranged between the top of the piston and the inner side wall of the valve cover. The bottom of the piston is also provided with a sealing groove, and the sealing ring is connected to the sealing groove.

[0014] Preferably, the spring washer is bow-shaped.

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

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

[0017] Preferably, the lubricating material filled in each of the annular grooves is 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, which includes a valve body, a valve stem and a lubricating sealing assembly. The valve body has an exhaust gas channel and a bushing channel. The lubricating 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 itself movably arranged vertically. The bottom end of the valve stem is used to seal the intake end of the exhaust gas channel. The middle surface of the valve stem is recessed to form a plurality of annular grooves for filling lubricating material. The plurality of annular grooves are arranged at intervals 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 outer side of the valve stem. In this way, when the valve stem moves axially, it contacts the bushing assembly through the lubricating material on the annular groove, which can be lubricated. The tiny gap between the valve stem and the bushing assembly can also be filled under the action of the lubricating liquid to reduce the exhaust gas from entering the valve body from the bushing channel. The spring washer in the mounting groove is tightly fitted with the valve stem through tension to prevent carbon deposits and impurities from entering the valve body. The entire EGR valve has few parts and strong integrity, and does not require the coordinated movement of multiple parts. Therefore, during operation, it is not easy for the selection valve to malfunction due to a malfunction in the coordination between parts. The sealing performance can be guaranteed to improve production efficiency, and its subsequent maintenance is also simpler and more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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 use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0021] Figure 1 A three-dimensional schematic diagram of the overall structure of an embodiment of the present invention;

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

[0023] Figure 3 A schematic cross-sectional view of the exhaust gas flow state of the overall structure in one embodiment of the present invention;

[0024] Figure 4 for Figure 2 A local enlarged schematic diagram of point A in the middle.

[0025] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments.

[0026] Description of Figure Numbers:

[0027] 10. Valve body; 110. Valve seat; 111. Exhaust channel; 112. Bushing channel; 120. Valve cover; 121. Internal cavity; 130. Spring; 140. Conical joint; 150. Piston; 160. Pan seal; 170. Sealing ring; 20. Valve stem; 210. Annular groove; 30. Lubrication seal assembly; 310. Bushing assembly; 311. First bushing; 312. Second bushing; 320. Spring washer. DETAILED DESCRIPTION

[0028] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] Please see the attached Figure 1-4 In one embodiment of the present invention, an EGR valve with a lubrication and carbon removal cleaning structure includes a valve body 10, a valve stem 20, and a lubrication seal assembly 30. The specific solution is as follows:

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

[0034] Specifically, the EGR valve with lubrication and carbon removal cleaning structure in the present application includes a valve body 10, a valve stem 20 and a lubricating sealing assembly 30. The valve body 10 is the main body of the EGR valve, which generally includes a valve seat 110 and a valve cover 120. The valve seat 110 is used for exhaust gas circulation, and has an exhaust gas channel 111 inside thereof for introducing part of the exhaust gas discharged by the engine into the intake system. The valve stem 20 opens / closes the exhaust gas channel 111 by moving along its own axial direction (vertical direction in the present application). 1, so the bottom end of the valve stem 20 is used to seal the air inlet end of the exhaust channel 111. When the valve stem 20 moves downward, a gap is generated between the valve stem 20 and the valve seat 110, and the exhaust gas can enter from the air inlet end of the exhaust channel 111 (the bottom end of the valve seat 110) and then flow out from the air outlet end of the exhaust channel 111. The valve cover 120 is used to seal the top of the valve seat 110 to prevent dust, impurities, water vapor, etc. from flowing into the interior of the valve seat 110. Further, it also includes a spring 130 and a cone The top of the valve seat 110 and the bottom of the valve cover 120 are both provided with an internal cavity 121. The internal cavity 121 of the valve cover 120 serves as a moving space for the spring 130 and the tapered joint 140. The internal cavity 121 of the valve seat 110 is used to install the spring 130. The tapered joint 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 tapered joint 140. In this way, when the exhaust gas flows into the intake system and the exhaust channel 111 needs to be closed, the elastic action of the spring 130 can better enable the bottom end of the valve stem 20 to seal the intake end of the exhaust channel 111, thereby ensuring normal operation of the engine. The lubricating seal assembly 30 is used to lubricate the movement of the valve stem 20 while improving airtightness and preventing carbon deposits from entering the valve seat 110.

[0035] The lubricating seal 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 so as to play a guiding and sealing role. Therefore, in order to facilitate the installation of the bushing assembly 310, a bushing channel 112 is opened in the valve seat 110 so that the bushing assembly 310 is connected to the bushing channel 112. In order to further optimize the effect of the bushing assembly 310, a plurality of annular grooves 210 are formed in the middle surface of the valve stem 20. The annular grooves 210 are used to fill the lubricating material, so that the valve stem 20 can be installed in the axial direction. During sliding, the lubrication degree is improved under the action of the lubricating material. It can be understood that the lubricating material is usually an oil liquid. Therefore, in addition to lubrication, the oil liquid can also fill the tiny gap between the valve stem 20 and the bushing assembly 310 to further prevent the exhaust gas from flowing into the valve cover 120 through the bushing channel 112. The oil liquid also has a certain viscous resistance, so the exhaust gas needs to overcome a large resistance to pass through the oil liquid, thereby achieving better lubrication and sealing performance. In this application as a preferred embodiment, the lubricating material can use 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 also provided with a mounting groove, which is used for the installation of the spring washer 320. The spring washer 320 is tightly fitted with the valve stem 20 through tensioning force, which can prevent carbon deposits and impurities generated by exhaust gas during long-term operation 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 washer 320 as the valve stem 20 moves axially, thereby achieving the effect of cleaning the carbon deposits and avoiding the failure of the valve stem 20 and the bushing assembly 310 locking with each other due to the entry of carbon deposits, thereby extending the service life of the EGR valve; preferably, the spring washer 320 can adopt a bow-shaped spring washer 320 to form an inclined surface, which can better scrape off the carbon deposits on the valve stem 20 and improve the particle cleaning effect of the spring washer 320.

[0037] As a preferred embodiment of the present invention, the bushing assembly 310 includes a first bushing 311 and a second bushing 312. The first bushing 311 and the second bushing 312 are both installed in the bushing channel 112, and the first bushing 311 is connected to the top of the second bushing 312. The bottom end of the second bushing 312 is recessed to form the installation 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 installation groove to facilitate the installation of the spring washer 320. The bottom end of the second bushing 312 extends to near the exhaust gas channel 111, so that the spring washer 320 is located near the exhaust gas channel 111 when installed at the bottom end of the second bushing 312, so that the carbon deposited particles adhering to the valve stem 20 are scraped off from the bottom end of the bushing channel 112, thereby improving the carbon removal efficiency, reducing the time of adhesion to the valve stem 20, and improving the sliding efficiency of the valve stem 20.

[0039] As a preferred embodiment of the present invention, the second bushing 312 is stepped to include an upper step and a lower step, the outer diameter of the upper step is larger than the outer diameter of the lower step, and the bushing channel 112 is stepped to match the bushing assembly 310.

[0040] It should be noted that the stepped form with a width at the top and a narrowness at the bottom forms a mutual abutment effect with the bushing channel 112 which is also stepped. When the valve stem 20 moves downward along with the tapered joint 140 and the spring 130, the step can be limited when pressed to the bottom and provide support.

[0041] Furthermore, it also includes a piston 150, a pan seal 160 and a sealing ring 170. The piston 150 is arranged between the conical joint 140 and the inner top wall of the valve cover 120. The pan seal 160 sealing sleeve is arranged between the top of the piston 150 and the inner side wall of the valve cover 120. The bottom of the piston 150 is also provided with a sealing groove, and the sealing ring 170 is connected to the sealing groove.

[0042] It should be noted that the main function of the piston 150 is to control the flow rate of exhaust gas recirculation through its movement. When the piston 150 moves, it changes the opening of the internal channel of the EGR valve, thereby regulating the amount of exhaust gas entering the intake system. Therefore, the piston 150 is arranged between the tapered joint 140 and the inner top wall of the valve cover 120. When the piston 150 moves downward to push the tapered joint 140 and compress the spring 130 to drive the valve stem 20 to move downward, the exhaust gas channel 111 of the EGR valve is opened, allowing exhaust gas to enter the intake system; when the exhaust gas channel 111 of the EGR valve needs to be closed, the piston 150 stops pushing and moves upward under the elastic action of the spring 130, preventing exhaust gas from entering the intake system; and the pan seal 160 and the sealing ring 170 are used to prevent gas from entering the interior of the valve seat 110, thereby playing a sealing role.

[0043] Furthermore, the number of the annular grooves 210 is three, and the three annular grooves 210 are spaced apart 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 surfaces there are for high-temperature resistant lubricating grease. Considering the processing cost and the fact that the structure is not prone to having too many holes, preferably, the number of annular grooves 210 is three. The specific number can be selected by those skilled in the art according to actual needs.

[0045] Furthermore, the second bushing 312 and the valve seat 110 are interference fit.

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

[0047] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An EGR valve with lubrication and carbon removal cleaning structure, characterized in that: It includes a valve body, a valve stem and a lubricating seal assembly; wherein, The valve body has an exhaust gas passage and a bushing hole; The lubricating 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 movably arranged vertically. The bottom end of the valve stem is used to seal the intake end of the exhaust gas channel. The middle surface of the valve stem is recessed to form a plurality of annular grooves for filling lubricating material. The plurality of annular grooves are arranged at intervals 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 outer side of the valve stem.

2. The EGR valve with lubrication and carbon removal cleaning structure according to claim 1, characterized in that: The bushing assembly includes a first bushing and a second bushing. The first bushing and the second bushing are both installed in the bushing channel, and the first bushing is connected to the top of the second bushing. The bottom end of the second bushing is recessed to form the installation groove.

3. The EGR valve with lubrication and carbon removal cleaning structure according to claim 2, characterized in that: The second bushing is stepped to include an upper step and a lower step. The outer diameter of the upper step is greater than the outer diameter of the lower step. The bushing channel is stepped to match the bushing assembly.

4. The EGR valve with lubrication and carbon removal cleaning structure according to claim 2, characterized in that: The valve body includes a valve seat and a valve cover, the valve cover is sealed and connected above the valve seat, and the exhaust gas channel is formed in the valve seat.

5. The EGR valve with lubrication and carbon removal cleaning structure according to claim 4, characterized in that: It also includes a spring and a conical joint. The top of the valve seat and the bottom of the valve cover are both provided with internal cavities. The conical joint is connected to the top of the valve stem. The bottom end of the spring is connected to the valve seat and is sleeved on the outer side wall of the bushing channel. The top end of the spring is connected to the conical joint.

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

7. The EGR valve with lubrication and carbon removal cleaning structure according to claim 1, characterized in that: The spring washer is bow-shaped.

8. The EGR valve with lubrication and carbon removal cleaning structure according to claim 1, characterized in that: The number of the annular grooves is three, and the three annular grooves are spaced apart along the axial direction of the valve stem.

9. The EGR valve with lubrication and carbon removal cleaning structure according to claim 4, characterized in that: The second bushing is interference fit with the valve seat.

10. The EGR valve with lubrication and carbon removal cleaning structure according to claim 1, characterized in that: The lubricating material filled in each annular groove is high temperature resistant lubricating grease.

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