Double-valve-plate EGR valve and vehicle

Abstract

The invention relates to the technical field of vehicle exhaust gas recirculation, in particular to a double-valve-plate EGR valve and a vehicle. A first channel and a second channel are arranged in the valve seat in a spaced mode and communicate with each other, the valve rod sequentially penetrates through the first valve plate and the second valve plate, the first valve plate is used for opening or closing the first channel, the second valve plate is used for opening or closing the second channel, and the valve rod is arranged in the valve seat in a sliding mode. When the valve rod is located at the first position, the first valve plate closes the first channel, the second valve plate closes the second channel, when the valve rod is located at the second position, the first valve plate opens the first channel, the second valve plate closes the second channel, and when the valve rod is located at the third position, the first valve plate opens the first channel. The second valve plate opens the second channel. Compared with the prior art, the double-valve-plate EGR valve has the advantages that the first channel and the second channel can be selectively controlled to be opened according to different working conditions, the control precision is improved, the leakage rate is reduced, and the universality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle exhaust gas recirculation, and particularly to a dual-valve EGR valve and a vehicle. Background Art

[0002] With the gradual tightening of vehicle emission regulations, the EGR (Exhaust Gas Recirculation) technology is more and more widely applied, and the EGR valve is a key component of the EGR system. To achieve precise control of emissions, the EGR needs to meet the EGR flow requirements of various operating conditions of the vehicle, and at the same time, the leakage of the EGR needs to be as small as possible to avoid EGR flow errors and malfunctions of EGR system icing.

[0003] In the application of the existing EGR system for medium and heavy-duty vehicles, to meet the demand for the maximum EGR flow, an EGR valve with a dual-valve structure is usually adopted. Since there are two valve mating sealing surfaces in the dual-valve EGR valve and the vehicle, and there is an over-positioning situation in the simultaneous positioning of the two valve plates, the leakage of the dual-valve EGR valve and the vehicle is more than twice that of the single-valve EGR valve; on the other hand, since the vehicle often operates under conditions with a small EGR flow demand, the EGR valve usually operates in a small opening range of 0-10%, and usually the EGR flow is linearly proportional to the opening size, resulting in too fast a change in the flow rate of the EGR valve in the small opening state, which is not conducive to the precise control of the EGR flow under common operating conditions.

[0004] Therefore, there is an urgent need for a dual-valve EGR valve and a vehicle to solve the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a dual-valve EGR valve and a vehicle, which can improve the control accuracy and reduce the leakage.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A dual-valve EGR valve includes: a valve seat, a valve rod, a first valve plate and a second valve plate. A first channel and a second channel are spaced in the valve seat, the first channel and the second channel are communicated, the valve rod sequentially penetrates through the first valve plate and the second valve plate, the first valve plate is used to open or close the first channel, the second valve plate is used to open or close the second channel, the valve rod is slidably arranged in the valve seat so that the valve rod has a first position, a second position and a third position. When the valve rod is in the first position, the first valve plate closes the first channel and the second valve plate closes the second channel; when the valve rod is in the second position, the first valve plate opens the first channel and the second valve plate closes the second channel; when the valve rod is in the third position, the first valve plate opens the first channel and the second valve plate opens the second channel.

[0008] As a preferred technical solution of the above-mentioned double-valve EGR valve, the inner wall of the first channel is provided with a first inclined surface, and the first valve plate is provided with a second inclined surface. When the valve stem is in the first position, the first inclined surface abuts against the second inclined surface. When the valve stem is in the second position and the third position, the first inclined surface is separated from the second inclined surface.

[0009] As a preferred technical solution of the above-mentioned double-valve EGR valve, one end of the first inclined surface close to the second channel is far from the valve stem, and one end of the first inclined surface far from the second channel is close to the valve stem.

[0010] As a preferred technical solution of the above-mentioned double-valve EGR valve, the inner wall of the second channel is provided with a third inclined surface and a first contact surface. The third inclined surface and the first contact surface are connected at an angle. The second valve plate is provided with a fourth inclined surface and a second contact surface. When the valve stem is in the first position, the third inclined surface abuts against the fourth inclined surface, and the first contact surface abuts against the second contact surface. When the valve stem is in the second position, the third inclined surface is separated from the fourth inclined surface, and the first contact surface abuts against the second contact surface. When the valve stem is in the third position, the third inclined surface is separated from the fourth inclined surface, and the first contact surface is separated from the second contact surface.

[0011] As a preferred technical solution of the above-mentioned double-valve EGR valve, both the first contact surface and the second contact surface are cylindrical.

[0012] As a preferred technical solution of the above-mentioned double-valve EGR valve, one end of the third inclined surface close to the first channel is close to the valve stem, and one end of the third inclined surface far from the first channel is far from the valve stem.

[0013] As a preferred technical solution of the above-mentioned double-valve EGR valve, the valve seat, the valve stem, the first valve plate and the second valve plate are all made of metal.

[0014] As a preferred technical solution of the above-mentioned double-valve EGR valve, the valve stem, the first valve plate and the second valve plate are integrally formed.

[0015] As a preferred technical solution of the above-mentioned double-valve EGR valve, the first valve plate is provided with a first mounting hole, and the second valve plate is provided with a second mounting hole. The valve stem passes through the first mounting hole and the second mounting hole in sequence, and the valve stem is in interference fit with the hole walls of the first mounting hole and the second mounting hole respectively.

[0016] A vehicle includes a combustion system and an exhaust system. The vehicle further includes the dual-valve EGR valve described in any one of the above, and both ends of the dual-valve EGR valve are respectively communicated with the combustion system and the exhaust system.

[0017] Advantages of the present invention:

[0018] The present invention provides a dual-valve EGR valve. The dual-valve EGR valve includes: a valve seat, a valve stem, a first valve plate and a second valve plate. A first channel and a second channel are spaced apart in the valve seat, and the first channel and the second channel are communicated. The valve stem sequentially passes through the first valve plate and the second valve plate. The first valve plate is used to open or close the first channel, and the second valve plate is used to open or close the second channel. The valve stem is slidably disposed in the valve seat so that the valve stem has a first position, a second position and a third position. When the valve stem is in the first position, the first valve plate closes the first channel and the second valve plate closes the second channel. When the valve stem is in the second position, the first valve plate opens the first channel and the second valve plate closes the second channel. When the valve stem is in the third position, the first valve plate opens the first channel and the second valve plate opens the second channel. Compared with the prior art, when a small flow rate is required, the valve stem is in the second position, the first valve plate opens the first channel, and the second valve plate closes the second channel. At this time, the exhaust gas flows out through the first channel. When a large flow rate is required, the valve stem is in the third position, the first valve plate opens the first channel, and the second valve plate opens the second channel. At this time, the exhaust gas flows out through the first channel and the second channel, improving the control accuracy, meeting the requirements of the vehicle under different working conditions, reducing the leakage amount, and improving the versatility.

[0019] The present invention provides a vehicle, including a combustion system and an exhaust system. The vehicle further includes the dual-valve EGR valve in the above embodiment, and both ends of the dual-valve EGR valve are respectively communicated with the combustion system and the exhaust system. Compared with the prior art, the dual-valve EGR valve can adjust the size of the EGR flow according to different working conditions, solves the problem that the flow rate changes too fast in the small opening state of the dual-valve EGR valve, achieves a higher control accuracy effect, avoids the faults of EGR flow error and EGR system icing, makes the vehicle applicable to different working conditions, improves the versatility of the vehicle, reduces vehicle failures, and improves the service life of the vehicle. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present invention and these drawings.

[0021] Figure 1 It is the first structural schematic diagram of the dual-valve EGR valve provided by the embodiment of the present invention;

[0022] Figure 2 It is the second structural schematic diagram of the dual-valve EGR valve provided by the embodiment of the present invention;

[0023] Figure 3 It is the third structural schematic diagram of the dual-valve EGR valve provided by the embodiment of the present invention.

[0024] In the figure:

[0025] 1. Valve seat; 11. First channel; 111. First inclined surface; 12. Second channel; 121. Third inclined surface; 122. First contact surface; 2. Valve stem; 3. First valve plate; 31. Second inclined surface; 4. Second valve plate; 41. Fourth inclined surface; 42. Second contact surface. Specific embodiments

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0027] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above and over", and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below and under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0029] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left", and "right" are based on the orientation or positional relationships shown in the drawings. They are only for convenience of description and simplifying operations, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0030] As Figure 1 and Figure 2 shown, the present invention provides a dual-valve EGR valve. The dual-valve EGR valve includes: a valve seat 1, a valve stem 2, a first valve plate 3, and a second valve plate 4.

[0031] Specifically, a first channel 11 and a second channel 12 are spaced apart in the valve seat 1. The first channel 11 and the second channel 12 are in communication. The valve stem 2 passes through the first valve plate 3 and the second valve plate 4 in sequence. The first valve plate 3 is used to open or close the first channel 11, and the second valve plate 4 is used to open or close the second channel 12. The valve stem 2 is slidably disposed in the valve seat 1 so that the valve stem 2 has a first position, a second position, and a third position. When the valve stem 2 is in the first position, the first valve plate 3 closes the first channel 11, and the second valve plate 4 closes the second channel 12. When the valve stem 2 is in the second position, the first valve plate 3 opens the first channel 11, and the second valve plate 4 closes the second channel 12. When the valve stem 2 is in the third position, the first valve plate 3 opens the first channel 11, and the second valve plate 4 opens the second channel 12. Compared with the prior art, when a small flow rate is required, the valve stem 2 is in the second position, the first valve plate 3 opens the first channel 11, and the second valve plate 4 closes the second channel 12. At this time, the exhaust gas flows out through the first channel 11. When a large flow rate is required, the valve stem 2 is in the third position, the first valve plate 3 opens the first channel 11, and the second valve plate 4 opens the second channel 12. At this time, the exhaust gas flows out through the first channel 11 and the second channel 12, improving the control accuracy, meeting the requirements of the vehicle under different working conditions, reducing the leakage amount, and improving the versatility.

[0032] Optionally, a first inclined surface 111 is provided on the inner wall of the first channel 11, and a second inclined surface 31 is provided on the first valve plate 3. When the valve stem 2 is in the first position, the first inclined surface 111 abuts against the second inclined surface 31. When the valve stem 2 is in the second position and the third position, the first inclined surface 111 is separated from the second inclined surface 31. Specifically, the inclination angle of the first inclined surface 111 is the same as the inclination angle of the second inclined surface 31. The valve seat 1 provides a movement guide for the valve stem 2, so that the valve stem 2 slides along the length direction of the valve seat 1. The first inclined surface 111 and the second inclined surface 31 abut against each other to form a seal, preventing gas leakage.

[0033] Optionally, one end of the first inclined surface 111 close to the second channel 12 is away from the valve stem 2, and one end of the first inclined surface 111 away from the second channel 12 is close to the valve stem 2. Specifically, the cross-section of the first channel 11 is trapezoidal, so that the inner wall of the first channel 11 has a limiting function to prevent the valve stem 2 from moving excessively. At the same time, the cooperation of the trapezoidal inclined surfaces can control the opening degree of the first channel 11 and accurately control the discharge amount.

[0034] Optionally, a third inclined surface 121 and a first contact surface 122 are provided on the inner wall of the second channel 12. The third inclined surface 121 and the first contact surface 122 are angularly connected. The second valve plate 4 is provided with a fourth inclined surface 41 and a second contact surface 42. When the valve stem 2 is in the first position, the third inclined surface 121 abuts against the fourth inclined surface 41, and the first contact surface 122 abuts against the second contact surface 42. When the valve stem 2 is in the second position, the third inclined surface 121 is separated from the fourth inclined surface 41, and the first contact surface 122 abuts against the second contact surface 42. When the valve stem 2 is in the third position, the third inclined surface 121 is separated from the fourth inclined surface 41, and the first contact surface 122 is separated from the second contact surface 42. Specifically, the inclination angle of the third inclined surface 121 is the same as the inclination angle of the fourth inclined surface 41. When the valve stem 2 is in the first position, both the first channel 11 and the second channel 12 are closed. At this time, the double-valve-plate EGR valve is in a triple-sealed state. When the valve stem 2 is in the second position, the first channel 11 is opened, the second channel 12 corresponding to the third inclined surface 121 is opened, and the second channel 12 corresponding to the first contact surface 122 is closed. At this time, only the first channel 11 is opened, which is suitable for working conditions with a small emission demand. When the valve stem 2 is in the third position, both the first channel 11 and the second channel 12 are opened. At this time, the double-valve-plate EGR valve is in a fully open state, which is suitable for working conditions with a large emission demand.

[0035] Furthermore, in this embodiment, both the first contact surface 122 and the second contact surface 42 are cylindrical, and the projection length of the first contact surface 122 in the axial direction of the valve stem 2 is greater than the projection length of the first inclined surface 111 in the axial direction of the valve stem 2, which can ensure that when the opening degree of the first channel 11 reaches the maximum, the second channel 12 is still in a closed state. When the maximum discharge amount of the first channel 11 does not meet the demand, the valve stem 2 continues to move to open the second channel 12 and increase the discharge amount to meet the demand. Of course, in some other embodiments, the shapes of the first contact surface 122 and the second contact surface 42 are determined according to the actual situation, as long as the first contact surface 122 can form a surface seal with the second contact surface 42, which will not be elaborated here.

[0036] Optionally, one end of the third inclined surface 121 close to the first channel 11 is close to the valve stem 2, and the end of the third inclined surface 121 away from the first channel 11 is away from the valve stem 2. Specifically, the second channel 12 corresponding to the third inclined surface 121 is trapezoidal, so that the inner wall of the second channel 12 has a limiting function to prevent the valve stem 2 from moving too far. At the same time, the cooperation of the trapezoidal inclined surface can control the opening degree of the second channel 12 and accurately control the emission amount.

[0037] Optionally, the valve seat 1, the valve stem 2, the first valve plate 3 and the second valve plate 4 are all made of metal, which can increase the service life of the double-valve EGR valve.

[0038] Optionally, the valve stem 2, the first valve plate 3 and the second valve plate 4 are integrally formed. Specifically, the valve stem 2, the first valve plate 3 and the second valve plate 4 are fixed by welding, which can improve the stability of the double-valve EGR valve.

[0039] Optionally, the first valve plate 3 is provided with a first mounting hole, the second valve plate 4 is provided with a second mounting hole, the valve stem 2 passes through the first mounting hole and the second mounting hole in sequence, and the valve stem 2 is in interference fit with the hole wall of the first mounting hole and the hole wall of the second mounting hole respectively.

[0040] The present invention also provides a vehicle, including a combustion system and an exhaust system. The vehicle further includes the double-valve EGR valve in the above embodiment. Both ends of the double-valve EGR valve are respectively communicated with the combustion system and the exhaust system. The vehicle also includes other necessary components that make up the vehicle in the prior art. Compared with the prior art, the double-valve EGR valve can adjust the size of the EGR flow according to different working conditions, solves the problem that the flow rate of the double-valve EGR valve changes too fast in the small opening state, achieves a higher control accuracy effect, avoids EGR flow errors and faults of the EGR system icing, enables the vehicle to be applicable to different working conditions, improves the versatility of the vehicle, reduces vehicle failures, and improves the service life of the vehicle.

[0041] The control process of the double-valve EGR valve provided by the present invention is as follows:

[0042] When the EGR flow demand is large, as Figure 2 shown, the lift of the valve stem 2 is large, and the lift exceeds the cylindrical surface sealing height between the second valve plate 4 and the valve seat 1. At this time, the double-valve EGR valve simultaneously opens the first channel 11 and the second channel 12 to increase the flow area and achieve a large flow demand; in the common working conditions of the engine, when the EGR flow demand is low, as Figure 3As shown, the lift of the valve stem 2 is small, and the lift is lower than the cylindrical surface sealing height of the second valve plate 4 and the valve seat 1. At this time, although the second valve plate 4 has a lift, due to the cylindrical surface sealing structure, the gas only flows through the first channel 11, which is equivalent to the double-valve plate EGR valve only opening the first channel 11. At this stage, for the same change in EGR flow rate, the change in the opening of a single valve plate is more obvious than the change in the opening of the double-valve plate, solving the problem of too fast flow rate change of the double-valve plate EGR valve in the small opening state and achieving a higher control accuracy effect.

[0043] In addition, the above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A dual-valve EGR valve, characterized in that: include: A valve seat (1), a valve stem (2), a first valve disc (3) and a second valve disc (4); a first channel (11) and a second channel (12) are arranged in the valve seat (1) at intervals; the first channel (11) and the second channel (12) are communicated; the valve stem (2) passes through the first valve disc (3) and the second valve disc (4) in sequence; the first valve disc (3) is used to open or close the first channel (11); the second valve disc (4) is used to open or close the second channel (12); the valve stem (2) is slidably arranged in the valve seat (1) so that the valve stem (2) has a first position, a second position and a third position; when the valve stem (2) is located at the first position, the first valve disc (3) closes the first channel (11), and the second valve disc (4) closes the second channel (12); when the valve stem (2) is located at the second position, the first valve disc (3) opens the first channel (11), and the second valve disc (4) closes the second channel (12); when the valve stem (2) is located at the third position, the first valve disc (3) opens the first channel (11), and the second valve disc (4) opens the second channel (12).

2. A dual-valve EGR valve according to claim 1, characterized in that: The inner wall of the first channel (11) is provided with a first inclined surface (111), and the first valve plate (3) is provided with a second inclined surface (31); when the valve stem (2) is located at the first position, the first inclined surface (111) abuts against the second inclined surface (31); when the valve stem (2) is located at the second position and the third position, the first inclined surface (111) is separated from the second inclined surface (31).

3. A dual-valve EGR valve according to claim 2, characterized in that: An end of the first inclined surface (111) close to the second channel (12) is away from the valve stem (2), and an end of the first inclined surface (111) away from the second channel (12) is close to the valve stem (2).

4. The dual-valve EGR valve according to claim 1, characterized in that: The inner wall of the second channel (12) is provided with a third inclined surface (121) and a first contact surface (122), and the third inclined surface (121) is connected to the first contact surface (122) at an angle. The second valve plate (4) is provided with a fourth inclined surface (41) and a second contact surface (42). When the valve stem (2) is located at the first position, the third inclined surface (121) abuts against the fourth inclined surface (41), and the first contact surface (122) abuts against the second contact surface (42). When the valve stem (2) is located at the second position, the third inclined surface (121) is separated from the fourth inclined surface (41), and the first contact surface (122) abuts against the second contact surface (42). When the valve stem (2) is located at the third position, the third inclined surface (121) is separated from the fourth inclined surface (41), and the first contact surface (122) is separated from the second contact surface (42).

5. The dual-valve EGR valve according to claim 4, characterized in that: The first contact surface (122) and the second contact surface (42) are both cylindrical.

6. The dual-valve EGR valve according to claim 4, characterized in that: An end of the third inclined surface (121) close to the first channel (11) is close to the valve stem (2), and an end of the third inclined surface (121) away from the first channel (11) is away from the valve stem (2).

7. A dual-valve EGR valve according to any one of claims 1 to 6, characterized in that: The valve seat (1), the valve stem (2), the first valve plate (3) and the second valve plate (4) are all made of metal.

8. A dual-valve EGR valve according to any one of claims 1 to 6, characterized in that: The valve stem (2), the first valve plate (3) and the second valve plate (4) are integrally formed.

9. A dual-valve EGR valve according to any one of claims 1 to 6, characterized in that: The first valve plate (3) is provided with a first mounting hole, the second valve plate (4) is provided with a second mounting hole, the valve stem (2) passes through the first mounting hole and the second mounting hole in sequence, and the valve stem (2) is respectively interference-fitted with the hole wall of the first mounting hole and the hole wall of the second mounting hole.

10. A vehicle comprising a combustion system and an exhaust system, characterized in that: The vehicle further comprises a dual-valve EGR valve as claimed in any one of claims 1 to 9, wherein two ends of the dual-valve EGR valve are respectively connected to the combustion system and the exhaust system.

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