Exhaust gas recirculation valve, engine and vehicle

Abstract

The utility model relates to the technical field of exhaust gas recirculation of engines, in particular to an exhaust gas recirculation valve, an engine and a vehicle. The exhaust gas recirculation valve comprises a valve body, a control valve, a self-cleaning part and a driving part, an air channel, a guide hole, an air inlet and an air outlet are formed in the valve body, a part of a body of the control valve is arranged in the air channel and used for opening or closing the air channel, the self-cleaning part is arranged on a valve rod, and the self-cleaning part can abut against the inner wall of the guide hole and remove sediments on the inner wall. The driving part is in transmission connection with the valve rod. According to the exhaust gas recirculation valve, the valve rod is provided with the self-cleaning part, the self-cleaning part can abut against the inner wall of the guide hole in the valve body and remove sediments on the inner wall, the situation that the valve rod cannot slide in the guide hole due to accumulation of the sediments is avoided, and the problem that clamping stagnation is prone to occurring between the valve rod and the valve body is solved; therefore, the reliability of the exhaust gas recirculation valve is improved, and the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of exhaust gas recirculation of an engine, in particular to an exhaust gas recirculation valve, an engine and a vehicle. Background Art

[0002] The EGR system (exhaust gas recirculation system) is a key technology for reducing nitrogen oxide emissions in modern engines. The EGR system achieves the purpose of reducing nitrogen oxide emissions by re-introducing part of the exhaust gas discharged by the engine into the cylinder for re-sintering. The EGR valve plays a vital role in this system. It is used to adjust and control the flow of recirculated exhaust gas. However, in the prior art, the EGR valve has certain design defects, especially in the design between the valve shaft (i.e., valve stem) and the valve body. Since it is necessary to ensure that the valve shaft can slide in the valve body, a very small gap needs to be set between the valve shaft and the valve body, which makes it easy for dust and other particulate matter to accumulate in the above gap, thereby causing the valve shaft to get stuck. Utility Model Content

[0003] The purpose of the utility model is to at least solve the problem that the valve shaft and the valve body of the exhaust gas recirculation valve are prone to get stuck. This purpose is achieved through the following technical solutions:

[0004] The first aspect of the utility model provides an exhaust gas recirculation valve, comprising:

[0005] A valve body, wherein an airway, a guide hole, an air inlet and an air outlet are provided on the valve body, wherein the guide hole, the guide hole, the air inlet and the air outlet are respectively connected to the airway, and a connecting position between the guide hole and the airway is located between the air inlet and the air outlet;

[0006] A control valve, part of the body of the control valve is disposed in the airway and is used to open or close the airway, the control valve comprises a valve stem, part of the valve stem is slidably disposed in the guide hole and is in clearance fit with the guide hole;

[0007] A self-cleaning portion, the self-cleaning portion being disposed on the outer peripheral surface of the valve stem, the self-cleaning portion being able to abut against the inner wall of the guide hole and remove sediment on the inner wall;

[0008] A driving part is drivingly connected to the valve stem so as to switch the control valve between an open state and a closed state.

[0009] According to the exhaust gas recirculation valve of the utility model, a self-cleaning portion is provided on the valve stem. When the valve stem slides, the self-cleaning portion can abut against the inner wall of the guide hole in the valve body and clean the deposits on the inner wall, thereby preventing the valve stem from being unable to slide in the guide hole due to the accumulation of deposits, effectively solving the problem of easy jamming between the valve stem and the valve body, thereby improving the reliability and efficiency of the exhaust gas recirculation valve, reducing maintenance costs, and contributing to environmental protection.

[0010] In addition, the exhaust gas recirculation valve according to the utility model may also have the following additional technical features:

[0011] In some embodiments of the present invention, the valve stem includes a first part and a second part coaxially connected, the diameter of the first part is smaller than the diameter of the second part, and when the control valve is in the closed state, at least a portion of the second part is inserted into the guide hole and abuts against the inner wall of the guide hole.

[0012] In some embodiments of the present invention, the self-cleaning portion is a boss structure formed at the connection between the first portion and the second portion, and the step of the boss structure is a sharp edge.

[0013] In some embodiments of the present invention, when the control valve is in the open state, the step protrudes out of the guide hole.

[0014] In some embodiments of the utility model, when the control valve is in the closed state, part of the first part protrudes from the guide hole, the step is located inside the guide hole, and there is a first distance between the opening of the guide hole for the first part to pass through and the step, and the first distance is 2-3 mm.

[0015] In some embodiments of the present invention, the control valve further comprises a valve plate, wherein the valve plate is connected to the valve stem, and the valve plate is used to open or close the air passage.

[0016] In some embodiments of the utility model, a partition structure is provided in the air duct, the partition structure is provided between the air inlet and the air outlet, a connecting hole is provided on the partition structure, the valve stem passes through the connecting hole, in the open state, the valve plate and the partition structure are spaced apart and the connecting hole is opened, and in the closed state, the valve plate and the partition structure are abutted against each other and close the connecting hole.

[0017] In some embodiments of the present invention, the self-cleaning portion is a carbon scraper ring, and the carbon scraper ring abuts against the inner wall of the guide hole.

[0018] The second aspect of the utility model provides an engine, comprising:

[0019] Exhaust and intake manifolds;

[0020] As in the above-mentioned exhaust gas recirculation valve, the air inlet is connected to the exhaust manifold, and the air outlet is connected to the intake manifold.

[0021] A third aspect of the present invention provides a vehicle, comprising the engine as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limiting of the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0023] Figure 1 The structure diagram of the exhaust gas recirculation valve according to the embodiment of the utility model is schematically shown;

[0024] Figure 2 The structure diagram of the valve stem and the guide hole according to the embodiment of the utility model is schematically shown;

[0025] Figure 3 A schematic diagram of a local structure of a control valve in an open state according to an embodiment of the utility model is schematically shown;

[0026] Figure 4 The partial structural diagram of the control valve in a closed state according to an embodiment of the utility model is schematically shown.

[0027] The reference numerals are as follows:

[0028] 100, exhaust gas recirculation valve; 101, housing; 102, air duct; 11, air inlet; 12, air outlet; 13, guide hole;

[0029] 10. Valve body; 20. Valve stem; 21. Valve plate; 22. Self-cleaning unit; 30. Drive unit; 31. Motor housing; 32. Motor assembly; 33. Motor back cover; 40. Hexagon socket bolt; 41. Rocker arm; 42. Return spring; 43. Spring seat; 44. Slider; 45. Oil-free bearing; 46. Reducer assembly; 47. Transition gear; 50. Bushing; 51. First sealing ring; 52. Second sealing ring; 60. Sensor assembly; 70. Cooling water pipe. DETAILED DESCRIPTION

[0030] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0031] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0032] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0033] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both above and below orientations.

[0034] like Figures 1 to 4As shown, according to an embodiment of the present utility model, an exhaust gas recirculation valve 100 is proposed, which includes a valve body 10, a control valve, a self-cleaning part 22 and a driving part 30, wherein the valve body 10 is provided with an air duct 102, a guide hole 13, an air inlet 11 and an air outlet 12, the guide hole 13, the air inlet 11 and the air outlet 12 are respectively connected with the air duct 102, and the connecting position of the guide hole 13 and the air duct 102 is located between the air inlet 11 and the air outlet 12. Part of the main body of the control valve is arranged in the airway 102 and is used to open or close the airway 102. The control valve includes a valve stem 20. Part of the valve stem 20 is slidably arranged in the guide hole 13 and is clearance-matched with the guide hole 13. A self-cleaning portion 22 is provided on the outer peripheral surface of the valve stem 20. The self-cleaning portion 22 can abut against the inner wall of the guide hole 13 and remove the deposits on the inner wall. The driving portion 30 is transmission-connected to the valve stem 20 so that the control valve can switch between an open state and a closed state.

[0035] According to the exhaust gas recirculation valve 100 of the present invention, a self-cleaning portion 22 is provided on the valve stem 20. When the valve stem 20 slides, the self-cleaning portion 22 can abut against the inner wall of the guide hole 13 in the valve body 10 and remove the deposits on the inner wall, thereby preventing the valve stem 20 from being unable to slide in the guide hole 13 due to the accumulation of deposits, effectively solving the problem of easy jamming between the valve stem 20 and the valve body 10, thereby improving the reliability and efficiency of the exhaust gas recirculation valve 100, reducing maintenance costs, and contributing to environmental protection.

[0036] It should be noted that Figure 1 The direction of the middle arrow a represents the flow direction of the exhaust gas, and the exhaust gas flows from the air inlet 11 to the air outlet 12 .

[0037] It is understandable that a bushing 50 may be provided between the guide hole 13 and the valve stem 20, and the step of the boss structure abuts against the inner wall of the bushing 50 to remove the sediment on the inner peripheral wall of the bushing 50. The bushing 50 and the guide hole 13 are interference fit to prevent sediment from entering between the bushing 50 and the guide hole 13. The guide hole 13 hereinafter represents the inner hole of the bushing 50.

[0038] Specifically, a partition structure is provided at the bottom of the valve body 10, that is, a partition structure is provided in the air passage 102, the partition structure is provided between the air inlet 11 and the air outlet 12, a connecting hole is provided on the partition structure, and the valve stem passes through the connecting hole. The control valve also includes a valve plate 21, a valve plate 21 is provided at the bottom end of the valve stem 20, and the valve plate 21 is used to open or close the air passage 102. When the valve stem 20 moves upward, the valve plate 21 abuts against and blocks the connecting hole, and the exhaust gas cannot flow in the air passage 102, and the control valve is in a closed state; when the valve stem 20 moves downward, the valve plate 21 leaves the connecting hole, that is, the valve plate 21 is spaced apart from the connecting hole, and the exhaust gas flows from the air inlet 11 to the air outlet 12 via the connecting hole, and the exhaust gas flows in the air passage 102, and the control valve is in an open state.

[0039] Specifically, the valve stem 20 includes a first portion and a second portion that are coaxially connected, the diameter of the first portion is smaller than the diameter of the second portion, and when the control valve is in a closed state, at least a portion of the second portion is inserted into the guide hole 13 and abuts against the inner wall of the guide hole 13. The boss structure formed at the connection between the first portion and the second portion is the self-cleaning portion 22, and the step of the boss structure is a sharp edge. The two-part design with different diameters enhances the structural stability of the valve stem 20, especially in high temperature and high pressure working environments, which helps to maintain the reliability and durability of the valve. In addition, the sharp edge design of the boss structure enables the valve stem 20 to effectively scrape off the deposits on the inner wall of the guide hole 13 during movement, which helps to prevent the valve stem 20 from getting stuck in the guide hole 13.

[0040] It is understood that the axis of the first part and the axis of the second part coincide, and the first part and the second part are both symmetrically designed to ensure the stability and balance of the valve stem 20 when the valve stem 20 moves, which helps to reduce the vibration and deflection of the valve stem 20 during movement, and ensure the smoothness and accuracy of the operation of the recirculation valve. Specifically, by ensuring that the axes of the first part and the second part coincide and are symmetrically designed, the stability of the valve stem 20 can be greatly increased, especially when moving at high speed or working under high pressure. The stable movement of the valve stem 20 reduces the friction with the inner wall of the guide hole 13 (i.e., the inner wall of the bushing 50), thereby reducing wear and extending the service life of the valve. The symmetrical design of the axis ensures the linearity of the valve stem 20 during movement and improves the accuracy of the opening and closing of the valve, which is crucial to ensure the efficiency of exhaust gas recirculation. The coincident axis design also helps to reduce vibration and noise during the movement of the valve stem 20, which is beneficial to improving the smoothness and comfort of the operation of the entire system. The coincident axis design allows the valve stem 20 to remain stable under various operating conditions, whether under different temperature, pressure or flow rate conditions, and can ensure the efficient operation of the valve.

[0041] Specifically, when the control valve is in the open state, the step-protruding guide hole 13 is set, and the distance between the step-protruding guide hole 13 is the second distance (such as Figure 2As shown, b1 is the second distance), the sediment at the lower end of the guide hole 13 can be scraped clean to prevent more sediment from accumulating on the inner wall of the guide hole 13.

[0042] Specifically, when the control valve is in a closed state, part of the first portion protrudes from the guide hole 13, the step is located inside the guide hole 13, and a first distance (e.g. Figure 3 As shown, b2 is the first distance), and the first distance is 2-3 mm. This arrangement can reduce the contact area of ​​the first portion passing through the guide hole 13 and exposed to the high-temperature exhaust gas, and can prevent the valve stem 20 from getting stuck in the guide hole 13 after thermal expansion.

[0043] It can be understood that the air passage 102 is connected to the air inlet 11 and the air outlet 12 respectively, and the first part is arranged in the air passage 102. The first part is arranged in the air passage 102, and when the control valve is in an open state, the first part is in the high-temperature exhaust gas, because the diameter of the first part is smaller than the diameter of the second part, and the diameter of the second part is slightly smaller than the inner diameter of the guide hole 13, the first part will not be stuck in the guide hole 13 even after being heated and expanded.

[0044] In some embodiments, the self-cleaning portion 22 is a carbon scraper ring, which abuts against the inner wall of the guide hole 13 or the inner wall of the bushing 50. The carbon scraper ring is arranged on the valve stem 20, and its position is the same as that of the boss structure. The outer diameter of the carbon scraper ring abuts against the inner diameter of the guide hole 13 or the inner wall of the bushing 50, so that the carbon scraper ring is in close contact with the inner wall of the guide hole 13 or the inner wall of the bushing 50 during the movement of the valve stem 20, so as to effectively scrape off the deposits attached to the inner wall of the guide hole 13. The material of the carbon scraper ring is selected to be a high temperature resistant and wear resistant alloy material to ensure long-term and effective operation under high temperature and high pressure environment.

[0045] Specifically, the exhaust gas recirculation valve 100 includes a housing 101 , and the housing 101 covers the entire outer surface of the exhaust gas recirculation valve 100 .

[0046] Specifically, the driving part 30 includes a motor housing 31, a motor assembly 32 and a motor rear cover 33. The output shaft of the motor assembly 32 is connected to the valve stem 20 through the transmission part to control the valve stem 20 to move up and down in the valve body 10. The motor housing 31 is fixed to the housing 101 through the hexagon socket bolt 40.

[0047] Specifically, the transmission part includes a rocker arm 41, a return spring 42, a spring seat 43, a slider 44, an oil-free bearing 45, a reduction gear assembly 46 and a transition gear 47. The rocker arm 41 is connected to the output shaft of the motor assembly 32 through the oil-free bearing 45, the transition gear 47 and the reduction gear assembly 46. The return spring 42 is fixed to the housing 101 through the spring seat 43. The motor assembly 32 drives the rocker arm 41 to move downward. The rocker arm 41 squeezes the slider 44, and the slider 44 squeezes the return spring 42 to drive the valve stem 20 to move downward. When the motor assembly 32 does not apply force, the return spring 42 drives the valve stem 20 to move upward, and the valve plate 21 of the valve stem 20 presses against the valve. The exhaust gas can no longer flow through the valve, and the exhaust gas recirculation valve 100 is in a closed state.

[0048] It is understood that the output shaft of the motor assembly 32 is directly connected to the input end of the reduction box assembly 46. The function of the reduction box assembly 46 is to reduce the high-speed rotation of the motor assembly 32 to a speed more suitable for the operation of the rocker arm 41. Such a connection is usually achieved through a standard coupling to ensure smooth transmission of rotational motion. Inside the reduction box, a set of transition gears 47 are set. These transition gears 47 are configured according to the required reduction ratio and steering requirements. The function of the transition gears 47 is to further adjust the rotation speed and direction to match the movement requirements of the rocker arm 41. On each rotating shaft of the transition gear 47 and the reduction box, oil-free bearings 45 are used. These bearings reduce maintenance requirements because they do not require regular lubrication. The output shaft of the reduction box is connected to the rocker arm 41 through a fixed joint. This joint ensures that the rocker arm 41 can move downward accordingly with the rotation of the output shaft. The design of the joint must ensure that it can withstand the forces and pressures in the operation of the rocker arm 41, and an oil-free bearing 45 is also provided at the connection between the joint and the rocker arm 41.

[0049] Specifically, a second sealing ring 52 is provided at the oil-free bearing 45 in the reduction box assembly 46, and a first sealing ring 51 is provided between the oil-free bearing 45 of the joint and the rocker arm 41. Both the first sealing ring 51 and the second sealing ring 52 are O-type rubber sealing rings.

[0050] Specifically, a sensor assembly 60 can be integrated into the exhaust gas recirculation valve 100 to enhance its functionality and efficiency. Specifically, this sensor assembly 60 includes a temperature sensor and a pressure sensor. The temperature sensor is installed near the valve body 10 to monitor the temperature conditions around the valve in real time. This is critical to prevent damage or performance degradation due to overheating, especially in an environment where the exhaust gas recirculation valve 100 is often exposed to high-temperature exhaust gas. The pressure sensor is installed near the air inlet 11 and the air outlet 12 to monitor the pressure of the air flow. This helps to adjust the opening degree of the exhaust gas recirculation valve 100 to ensure accurate control of the gas flow under different operating conditions. By connecting these sensors to the engine control unit (ECU), more sophisticated and intelligent control of the exhaust gas recirculation valve 100 can be achieved, thereby optimizing engine performance and reducing emissions.

[0051] Specifically, in the design of the exhaust gas recirculation valve 100, a cooling water pipe 70 system can be added to improve its efficiency and durability. A specific embodiment includes setting a cooling water pipe 70 around the valve body 10 of the exhaust gas recirculation valve 100. This cooling water pipe 70 effectively reduces the temperature of the valve body 10 caused by long-term exposure to high-temperature exhaust gas by circulating cooling water or other cooling media. The addition of a cooling system is particularly important for preventing valve overheating, reducing thermal stress, and preventing material degradation due to long-term high temperature. In addition, the design of the cooling water pipe 70 ensures that the cooling medium is evenly distributed around the valve body 10, providing effective heat dissipation. The cooling water pipe 70 is connected to the cooling system of the engine, and the existing cooling cycle of the engine can be utilized, thereby reducing additional energy consumption and system complexity. The design of this integrated cooling system not only improves the performance and reliability of the exhaust gas recirculation valve 100, but also helps to maintain the temperature balance of the entire engine system and improve overall efficiency.

[0052] This embodiment also proposes an engine, including an exhaust manifold, an intake manifold and the above-mentioned exhaust gas recirculation valve 100, the air inlet 11 is connected to the exhaust manifold, and the air outlet 12 is connected to the intake manifold. In addition, the exhaust gas recirculation valve 100 is controlled by an electronic control unit to automatically adjust the flow rate and recirculation rate of the exhaust gas according to the operating conditions of the engine. The engine is designed to be able to adjust the opening degree of the exhaust gas recirculation valve 100 according to different operating conditions (such as load, speed, temperature, etc.), so as to optimize the performance of the engine and reduce nitrogen oxide emissions. This engine design is suitable for various types of vehicles, including but not limited to passenger cars, commercial vehicles, heavy machinery and other applications requiring efficient exhaust gas treatment.

[0053] This embodiment also provides a vehicle, comprising the above-mentioned engine.

[0054] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An exhaust gas recirculation valve, characterized in that: include: A valve body, wherein an airway, a guide hole, an air inlet and an air outlet are provided on the valve body, wherein the guide hole, the air inlet and the air outlet are respectively connected to the airway, and a connecting position between the guide hole and the airway is located between the air inlet and the air outlet; A control valve, part of the body of the control valve is disposed in the airway and is used to open or close the airway, the control valve comprises a valve stem, part of the valve stem is slidably disposed in the guide hole and is in clearance fit with the guide hole; A self-cleaning portion, the self-cleaning portion being disposed on the outer peripheral surface of the valve stem, the self-cleaning portion being able to abut against the inner wall of the guide hole and remove sediment on the inner wall; A driving part is drivingly connected to the valve stem so as to switch the control valve between an open state and a closed state.

2. The exhaust gas recirculation valve according to claim 1, characterized in that: The valve stem includes a first portion and a second portion coaxially connected, the diameter of the first portion is smaller than the diameter of the second portion, and when the control valve is in the closed state, at least a portion of the second portion passes through the guide hole and abuts against the inner wall of the guide hole.

3. The exhaust gas recirculation valve according to claim 2, characterized in that: The self-cleaning portion is a boss structure formed at the connection between the first portion and the second portion, and the step of the boss structure is a sharp edge.

4. The exhaust gas recirculation valve according to claim 3, characterized in that: When the control valve is in the open state, the step protrudes from the guide hole.

5. The exhaust gas recirculation valve according to claim 3, characterized in that: When the control valve is in the closed state, part of the first part protrudes from the guide hole, the step is located inside the guide hole, and there is a first distance between the opening of the guide hole for the first part to pass through and the step, and the first distance is 2-3 mm.

6. The exhaust gas recirculation valve according to claim 2, characterized in that: The control valve further comprises a valve plate, which is connected to the valve stem and is used to open or close the air passage.

7. The exhaust gas recirculation valve according to claim 6, characterized in that: A partition structure is provided in the air passage, wherein the partition structure is provided between the air inlet and the air outlet, and a connecting hole is provided on the partition structure, wherein the valve stem passes through the connecting hole. In the open state, the valve plate is spaced apart from the partition structure and the connecting hole is opened, and in the closed state, the valve plate abuts against the partition structure and closes the connecting hole.

8. The exhaust gas recirculation valve according to claim 1, characterized in that: The self-cleaning part is a carbon scraping ring, and the carbon scraping ring abuts against the inner wall of the guide hole.

9. An engine, characterized in that: include: Exhaust and intake manifolds; The exhaust gas recirculation valve according to any one of claims 1 to 8, wherein the air inlet is connected to the exhaust manifold, and the air outlet is connected to the intake manifold.

10. A vehicle, characterized in that: Comprising the engine as claimed in claim 9.

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