A gate shaft type exhaust gas recirculation valve

Abstract

The utility model relates to exhaust gas recirculation valve technical field, especially in a door axle formula exhaust gas recirculation valve, including valve body, the valve rod of setting in the valve body, the valve piece of with valve rod connection and drive valve rod rotation around the axle to realize the electric control subassembly of valve opening and closing, the air inlet hole of exhaust gas entering, the air outlet hole of exhaust gas leaving and the exhaust hole that communicates with the exhaust pipe are equipped on the valve body, the valve cavity that is equipped with the communication air inlet hole, the air outlet hole and the exhaust hole in the valve body, the sealing seat that is annular is installed in the air outlet hole, the one end that valve rod is connected with electric control subassembly is equipped with reset component, the other end is detachably connected with the valve piece, the sealing seat includes embedding the flange of valve body outer surface, the seat body that is in line with the air outlet hole inner wall, the one end that seat body extends towards the valve body forms the sealing surface, the self -adaptation sealing assembly that can keep close in line with the sealing surface is equipped on the valve piece, the utility model has the advantages of: improve the sealing property.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas recirculation valve technology, specifically to a valve shaft type exhaust gas recirculation valve. Background Technology

[0002] Exhaust gas recirculation (EGR) is widely used in various diesel and gasoline engines. It is mainly used to precisely regulate the amount of exhaust gas returning to the intake system in order to reduce combustion temperature and reduce nitrogen oxide emissions.

[0003] Patent application number 201620030311.7 discloses a stepper motor driven electronically controlled EGR valve for an engine, including a drive shaft, an air passage, a butterfly valve plate, and a stepper motor; the drive shaft vertically penetrates both sides of the air passage, and one end is provided with a return mechanism, while the other end is connected to the stepper motor through a gear mechanism; the butterfly valve plate located in the air passage is elliptical, with its major axis being larger than the inner diameter of the air passage, and is fixed on the drive shaft with its minor axis as the axis; the stepper motor is also connected to a signal interface for receiving control signals.

[0004] The aforementioned patent document relies solely on the butterfly valve disc to seal and open the air passage, which has the following drawbacks: 1. Under high-temperature and vibration conditions of the engine, the butterfly valve disc and valve body expand and contract inconsistently, causing the valve disc to jam or the seal to fail; 2. Acidic substances in the exhaust gas and condensate combine to corrode the valve body, and high-speed particles in the exhaust gas will scour the inner wall of the air passage, causing surface scratches or coating peeling. Repeated thermal cycles and high pressure cause the metal substrate to expand and contract, leading to coating cracking or substrate deformation. The frequent occurrence of these conditions will cause carbon buildup, jamming, and leakage in the valve body. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a gantry-type exhaust gas recirculation valve that improves sealing performance, addressing the shortcomings of the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a valve body for waste gas recirculation, comprising a valve body, a valve stem disposed within the valve body, a valve plate connected to the valve stem, and an electronic control component for driving the valve stem to rotate around an axis to achieve valve opening and closing. The valve body is provided with an inlet for waste gas entry, an outlet for waste gas exit, and an exhaust port connected to an exhaust pipe. The valve body is provided with a valve cavity connecting the inlet, outlet, and exhaust port. An annular sealing seat is installed in the outlet. One end of the valve stem connected to the electronic control component is provided with a return component, and the other end is detachably connected to the valve plate. The sealing seat includes a flange embedded in the outer peripheral surface of the valve body and a seat body that fits against the inner wall of the outlet. One end of the seat body extending into the valve body forms a sealing surface. The valve plate is provided with an adaptive sealing component that can maintain a tight fit with the sealing surface.

[0007] The present invention, possessing the above-mentioned features, integrates an adaptive sealing component on the valve plate. The adaptive sealing component and the sealing surface of the sealing seat are fitted together to achieve sealing. The planar fitting sealing structure replaces the circumferential sealing structure in the prior art where the outer circumferential surface of the valve plate is fitted to the inner wall of the valve body, thus improving sealing performance and ensuring that the sealing effect is not affected by operating conditions. Precision errors inevitably exist in the manufacturing and assembly process of the sealing seat, affecting the parallelism of the sealing surface. The adaptive sealing component can adjust itself to always maintain a close fit with the sealing surface, ensuring sealing reliability.

[0008] A further feature of this invention is that the adaptive sealing assembly includes an adjusting rod that is inserted into the valve plate, and a sealing plate, a spring, a fixing plate, and a washer that are sequentially sleeved on the adjusting rod. One end of the spring abuts against the sealing plate, and the other end abuts against the fixing plate. The adjusting rod is a multi-segment shaft with an adjusting shaft segment. The end face of the adjusting shaft segment that is adapted to the sealing plate is an adjusting spherical surface. The sealing plate has a spherical groove that is adapted to the adjusting spherical surface.

[0009] The present invention, which has the above features, has the following characteristics: the adjusting spherical surface of the adjusting shaft section cooperates with the spherical groove of the sealing plate, so that the sealing plate can swing with the adjusting spherical surface as the fulcrum to fit the sealing surface, thereby achieving self-adaptive adjustment; one end of the spring abuts against the sealing plate and the other end abuts against the fixing plate in a pre-tightened state, which can continuously provide uniform pre-tightening force to the sealing plate, ensuring that the sealing plate always fits tightly against the sealing surface of the sealing seat.

[0010] A further feature of this invention is that the adjusting shaft includes a first shaft section for mounting a fixing plate and a washer, a second shaft section for mounting a spring, a flange shaft section that is in contact with the valve plate, and a third shaft section that is inserted into the valve plate. The outer diameter of the first shaft section is smaller than the outer diameter of the second shaft section, and a limiting surface that is in contact with the fixing plate is formed between the two. One end of the flange shaft section is connected to the adjusting shaft section, and the other end is in contact with the valve plate.

[0011] The present invention, which has the above-mentioned features, has a multi-segment shaft that enables precise positioning and assembly of each component, avoids axial displacement of the sealing plate, spring, and fixing plate, and prevents the sealing assembly from loosening or shifting under vibration conditions.

[0012] A further feature of this invention is that the valve plate includes a rectangular connecting portion and a circular main body portion. The connecting portion is disposed on one side of the main body portion, and the two are integrally formed. A flat groove is provided on the valve stem that is in contact with the connecting portion of the valve plate. The flat groove is connected to the valve plate by fasteners.

[0013] The present invention, which has the above features, has a valve plate and valve stem with an end face mounting structure, which facilitates processing and assembly.

[0014] A further feature of this invention is that an end cap is provided at the exhaust port, and an annular wall extends from the end cap toward the interior of the valve body. The exhaust port and the air outlet are located on adjacent side surfaces of the valve body. When the valve plate rotates 90 degrees with the valve stem, the valve plate is in contact with the annular wall.

[0015] The present invention, which has the above-mentioned features, has an exhaust port and an outlet port arranged adjacent to each other, and a valve stem and a valve plate connected to each other on the side and located between the exhaust port and the outlet port. This structural arrangement allows the valve plate to switch between the exhaust port and the outlet port, thereby changing the direction of the exhaust gas flow.

[0016] A further feature of this invention is that the inner wall of the valve body is provided with a composite coating, which includes a hard anodized film at the bottom layer and a PTFE coating at the top layer.

[0017] The present invention, which has the above-mentioned features, adopts a hard anodized film to improve the hardness of the valve body, avoid surface scratches caused by high-speed flowing particles, and enhance the wear resistance of the valve body; adopts a PTFE coating to effectively resist the corrosion of acidic substances and condensate in exhaust gas, while preventing carbon deposits from adhering to the inner wall of the valve body.

[0018] A further feature of this invention is that a bushing is fitted on the valve stem, the bushing being made of graphite, and the bushing being interference-fitted with the valve body.

[0019] The present invention possesses the above-mentioned features: graphite has high temperature resistance and self-lubricating properties. Under the high temperature conditions of the engine, the graphite bushing can maintain lubrication performance, prevent the valve stem and valve body from jamming due to dry friction or high temperature, and extend service life.

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 1 .

[0022] Figure 2 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 2 .

[0023] Figure 3 A cross-sectional view of an embodiment of this utility model. Figure 1 .

[0024] Figure 4 A cross-sectional view of an embodiment of this utility model. Figure 2 .

[0025] Figure 5 This is a schematic diagram of the valve stem and adaptive sealing assembly in an embodiment of the present invention.

[0026] Figure 6 This is an exploded view of the valve stem and adaptive sealing assembly according to an embodiment of the present invention.

[0027] Figure 7 This is a cross-sectional view of the adaptive sealing assembly according to an embodiment of the present invention. Detailed Implementation

[0028] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0029] like Figure 1-7 The valve shown is a gantry-type exhaust gas recirculation valve, comprising a valve body 1, a valve stem 2 disposed within the valve body 1, a valve plate 6 connected to the valve stem 2, and an electrical control assembly 3 for driving the valve stem 2 to rotate around an axis to realize valve opening and closing. A bushing 10, made of graphite, is fitted onto the valve stem 2 and is press-fitted with the valve body 1. The valve body 1 has an inlet 11 for exhaust gas entry, an outlet 12 for exhaust gas exit, and an exhaust port 13 connected to an exhaust pipe. An end cap 9 is provided at the exhaust port 13, and an annular wall 91 extends from the end cap 9 toward the interior of the valve body 1. The exhaust port 13 and the outlet 12 are located on adjacent side surfaces of the valve body 1. When the valve plate 6 rotates 90 degrees with the valve stem 2, the valve plate 6 and the annular wall 91... 1. The valve body 1 has a valve cavity that connects the air inlet 11, the air outlet 12 and the exhaust port 13. The inner wall of the valve cavity is coated with a composite coating, which includes a hard anodized film at the bottom and a PTFE coating at the top. An annular sealing seat 4 is installed in the air outlet 12. One end of the valve stem 2 connected to the electronic control component 3 is provided with a return component 5, and the other end is detachably connected to the valve plate 6. The valve plate 6 includes a rectangular connecting part 61 and a circular main body part 62. The connecting part 61 is located on one side of the main body part 62 and the two are integrally formed. A flat groove 21 is opened on the valve stem 2 that is in contact with the connecting part 61 of the valve plate 6. The flat groove 21 is connected to the valve plate 6 by fasteners, preferably bolts 8.

[0030] The sealing seat 4 includes a flange 41 embedded in the outer peripheral surface of the valve body 1 and a seat 42 that fits against the inner wall of the vent 12. One end of the seat 42 extending into the valve body 1 forms a sealing surface 43. The valve plate 6 is provided with an adaptive sealing assembly 7 that can maintain a tight fit with the sealing surface 43. The adaptive sealing assembly 7 includes an adjusting rod 71 that is inserted into the valve plate 6 and a sealing plate 72, a spring 73, a fixing plate 74, and a washer 75 sequentially sleeved on the adjusting rod 71. One end of the spring 73 abuts against the sealing plate 72, and the other end abuts against the fixing plate 74. The adjusting rod 71 is a multi-segment shaft on which the fixing plates 75 are sequentially mounted. 4. The first shaft section 712 with gasket 75, the second shaft section 713 with spring 73 installed, the adjusting shaft section 711, the flange shaft section 714 that is in contact with valve plate 6, and the third shaft section 715 that is inserted into valve plate 6. The end face of the adjusting shaft section 711 that is adapted to the sealing plate 72 is an adjusting spherical surface 7111. The sealing plate 72 is provided with a spherical groove 721 that is adapted to the adjusting spherical surface 7111. The outer diameter of the first shaft section 712 is smaller than the outer diameter of the second shaft section 713. The two form a limiting surface 716 that is in contact with the fixing plate 74. One end of the flange shaft section 714 is connected to the adjusting shaft section 711, and the other end is in contact with valve plate 6.

[0031] When assembling this exhaust gas recirculation valve, the sealing seat is press-fitted into the outlet hole. Due to installation errors, the sealing surface may tilt. It is also possible that the parallelism between the flange and the sealing surface of the sealing seat is incorrect during manufacturing, which will cause the sealing surface to tilt. The spherical groove of the sealing plate and the adjusting spherical surface of the adjusting shaft section cooperate. Under the action of the spring, the mating surface of the two is used as the fulcrum to swing slightly to change its tilt to fit the sealing surface, thus achieving self-adjustment.

[0032] The valve mentioned in the text refers to the fit between the sealing plate and the sealing surface. The valve stem drives the valve plate to rotate around the axis, changing the degree of contact between the sealing plate and the sealing surface to realize the opening and closing of the valve and the regulation of the flow rate. When the valve is closed, the exhaust gas enters from the air inlet and exits from the air outlet. When the valve is open or fully open (the valve plate rotates to close the air outlet), the exhaust gas enters from the air inlet and exits from the air outlet. The valve plate can change the direction of the exhaust gas flow.

Claims

1. A valve-type exhaust gas recirculation valve, comprising a valve body, a valve stem disposed within the valve body, a valve plate connected to the valve stem, and an electrical control component for driving the valve stem to rotate around an axis to realize valve opening and closing, characterized in that: The valve body is provided with an air inlet for waste gas entry, an air outlet for waste gas exit, and an exhaust port connected to the exhaust pipe. The valve body is provided with a valve cavity connecting the air inlet, air outlet, and exhaust port. An annular sealing seat is installed in the air outlet. One end of the valve stem connected to the electronic control component is provided with a return component, and the other end is detachably connected to the valve plate. The sealing seat includes a flange embedded in the outer peripheral surface of the valve body and a seat body that fits against the inner wall of the air outlet. The end of the seat body extending into the valve body forms a sealing surface. The valve plate is provided with an adaptive sealing component that can maintain a tight fit with the sealing surface.

2. The valve-type exhaust gas recirculation valve according to claim 1, characterized in that: The adaptive sealing assembly includes an adjusting rod that is inserted into the valve plate, and a sealing plate, a spring, a fixing plate, and a washer that are sequentially sleeved on the adjusting rod. One end of the spring abuts against the sealing plate, and the other end abuts against the fixing plate. The adjusting rod is a multi-segment shaft with an adjusting shaft segment. The end face of the adjusting shaft segment that is adapted to the sealing plate is an adjusting spherical surface. The sealing plate has a spherical groove that is adapted to the adjusting spherical surface.

3. A valve-type exhaust gas recirculation valve according to claim 2, characterized in that: The adjusting shaft also includes a first shaft section for mounting a fixing plate and a washer, a second shaft section for mounting a spring, a flange shaft section that is in contact with the valve plate, and a third shaft section that is inserted into the valve plate. The outer diameter of the first shaft section is smaller than the outer diameter of the second shaft section, and a limiting surface that is in contact with the fixing plate is formed between the two. One end of the flange shaft section is connected to the adjusting shaft section, and the other end is in contact with the valve plate.

4. The valve-type exhaust gas recirculation valve according to claim 1, characterized in that: The valve plate includes a rectangular connecting part and a circular main body part. The connecting part is located on one side of the main body part and the two are integrally formed. The valve stem has a flat groove that fits against the connecting part of the valve plate. The flat groove is connected to the valve plate by fasteners.

5. A valve-type exhaust gas recirculation valve according to claim 4, characterized in that: An end cap is provided at the exhaust port, and an annular wall extends from the end cap toward the inside of the valve body. The exhaust port and the air outlet are located on adjacent two sides of the valve body. When the valve plate rotates 90 degrees with the valve stem, the valve plate is in contact with the annular wall.

6. A valve-type exhaust gas recirculation valve according to any one of claims 1-5, characterized in that: The valve body has a composite coating, which includes a hard anodized film at the bottom and a PTFE coating at the top.

7. A valve-type exhaust gas recirculation valve according to any one of claims 1-5, characterized in that: A bushing made of graphite is fitted onto the valve stem, and the bushing is interference-fitted with the valve body.

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