CN104912638A - Exhaust pipeline tone tuning valve and exhaust pipeline - Google Patents

Abstract

The invention discloses an exhaust pipeline tone tuning valve. The valve comprises a first fixed seat, a second fixed seat, a shaft rod, a valve piece and a reset adjusting device. The first fixed seat and the second fixed seat are fastened on the side wall of an exhaust pipe, and the shaft rod can be rotatably connected to the first fixed seat and the second fixed seat and penetrates the side wall of the exhaust pipe; the valve piece is arranged in the exhaust pipe and is fixedly connected to the shaft rod; the reset adjusting device is arranged on the outer portion of the exhaust pipe; one end of the reset adjusting device is connected to the shaft rod, and the other end of the reset adjusting device is connected to the exhaust pipe; and the reset adjusting device and the shaft rod are coaxially arranged. The invention further discloses an exhaust pipeline with the exhaust pipeline tone tuning valve. Through the exhaust pipeline tone tuning valve and the exhaust pipeline, under the low-rotating-speed stage of an engine, the small opening angle can be kept, and the good acoustic performance is kept; and the opening angle can be increased along with rising of the rotating speed of the engine or increasing of the exhaust flow, and the backpressure requirement of the engine is met.

Description

An exhaust pipeline tuning valve and exhaust pipeline

technical field

The invention relates to the technical field of exhaust pipes, in particular to an exhaust pipe tuning valve and an exhaust pipe.

Background technique

At present, the power of automobile engines is continuously improved through new technologies, and the accompanying vibration and noise are also greater. However, car consumers have higher requirements for car NVH (Noise, Vibration, Harshness, noise, vibration and harshness), and reducing vibration and noise has become the focus and difficulty of car design.

Existing exhaust noise is mainly controlled passively through the design of pipelines and mufflers. The design of the noise reduction volume of this technology is generally positively correlated with the displacement of the engine. When the engine displacement is large and the silencer volume of the muffler is limited, when the back pressure target is met, the expected acoustic target cannot be achieved. In order to meet the noise requirements of the exhaust system, in the prior art, the method of increasing the volume of the muffler is usually used to solve the problem. The problems in this method are:

1. It is difficult to ensure the acoustic target of the exhaust system when the noise reduction volume is limited by the space layout of the ordinary passive silencer exhaust pipeline. Due to the limitation of space layout, in the process of vehicle layout, in the case of meeting the power loss requirements, it is likely that the noise requirements of the vehicle cannot be met due to the limited space.

2. The elastic element of the existing noise reduction structure is arranged inside the muffler and is directly exposed to the exhaust gas, which has high requirements on the performance of the elastic element, and the price and cost remain high.

3. The layout space is limited, and it cannot be adjusted according to the actual usage, which has a great impact on the back pressure.

Contents of the invention

The technical problem to be solved by the present invention is to provide an exhaust pipeline tuning valve and exhaust pipeline, which can maintain a small opening angle at the low engine speed stage and maintain good acoustic performance; Or increase the exhaust flow to increase the opening angle to meet the back pressure requirements of the engine.

Another technical problem to be solved by the present invention is: to improve the reliability of the reset adjustment device and reduce its production cost; to further improve the NVH performance of the tuning valve.

In order to solve the above technical problems, an embodiment of the present invention provides an exhaust pipe tuning valve, including: a first fixed seat and a second fixed seat fastened on the side wall of the exhaust pipe; The shaft on the first fixed seat and the second fixed seat and runs through the side wall of the exhaust pipe; the valve plate installed in the exhaust pipe, the valve plate is fixedly connected to the shaft; and the reset device installed outside the exhaust pipe As for the adjustment device, one end of the reset adjustment device is connected to the shaft rod, the other end of the reset adjustment device is connected to the exhaust pipe, and the reset adjustment device is arranged coaxially with the shaft rod.

Wherein, the reset adjustment device includes: a first positioning block; a second positioning block fixed on the exhaust pipe, wherein the shaft passes through the second positioning block and is fixedly connected with the first positioning block; and an elastic element, an elastic One end of the element is connected with the first positioning block, and the other end of the elastic element is connected with the second positioning block.

Wherein, the first positioning block is provided with a first gap, the second positioning block is provided with a second gap, the two ends of the elastic element are provided with hooks, and the hook at one end of the elastic element is set in the first gap of the first positioning block. The hook at the other end of the element is engaged in the gap of the second positioning block.

Wherein, the elastic element is a helical spring, and the central axis of the helical spring coincides with the axis of the shaft.

Wherein, the axis of the shaft is deviated from the center of the valve plate.

Wherein, a mass block is arranged on the valve plate.

Wherein, the cross section of the mass block is circular or elliptical.

Wherein, the valve plate is provided with convex ribs.

Wherein, a boss is provided at the end of the shaft rod close to the second fixing seat, and the second fixing seat is provided with a stepped hole matching the boss.

In order to solve the above-mentioned technical problems, the present invention also provides a technical solution with the exhaust pipeline of the above-mentioned exhaust pipeline tuning valve.

The exhaust pipeline tuning valve and the exhaust pipeline provided by the present invention have the following beneficial effects: since the shaft passes through the side wall of the exhaust pipe and is rotatably connected to the two fixed seats, the shaft is fastened and connected with The valve plate is arranged inside the exhaust pipe, and a reset adjustment device coaxially arranged with the shaft rod is installed on the outside of the exhaust pipe. When the exhaust gas of the engine passes through the above-mentioned tuning valve on the exhaust pipeline, the valve plate will be pushed to drive the shaft to rotate. Among them, at the stage of low engine speed, the opening angle of the valve plate can be kept small. At this time, the flow cross-sectional area is consistent with the optimal cross-sectional area required for noise reduction, which can maintain good acoustic performance; at the same time, the valve plate can be adjusted with the engine speed. The opening angle is increased due to the rise of the exhaust flow or the increase of the exhaust flow, which meets the back pressure requirements of the engine and can ensure the acoustic performance under a small silencing volume. In addition, it is convenient to arrange the tuning valve on the exhaust pipe, and the effect of improving the total noise and second-order noise of the tailpipe is obvious; the reset adjustment device is arranged outside the exhaust pipe, which improves the reliability of the reset adjustment device and can reduce all The cost of materials used; the NVH performance of the tuning valve is further improved by adding a mass block to the valve plate.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is an external schematic diagram of an exhaust pipe tuning valve according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of the blasting structure of the tuning valve of the exhaust pipeline according to the embodiment of the present invention.

Fig. 3 is a schematic diagram of the assembly structure of the tuning valve of the exhaust pipeline according to the embodiment of the present invention.

Fig. 4 is a schematic diagram of the internal structure of the tuning valve of the exhaust pipeline according to the embodiment of the present invention.

Fig. 5 is an enlarged structural schematic diagram of the elastic element of the tuning valve of the exhaust pipe according to the embodiment of the present invention.

Fig. 6 is a schematic diagram of the comparison of the total noise of the tailpipe before and after using the exhaust pipe tuning valve in the embodiment of the present invention.

Fig. 7 is a schematic diagram of the comparison of the second-order noise before and after using the exhaust pipe tuning valve in the embodiment of the present invention.

Fig. 8 is a schematic diagram of the comparison of back pressure before and after using the tuning valve of the exhaust pipeline according to the embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Referring to Fig. 1-Fig. 8 in combination, it is Embodiment 1 of the tuning valve of the exhaust pipeline of the present invention.

Please refer to Fig. 1 and Fig. 2 in conjunction, the exhaust pipeline tuning valve in this embodiment includes:

The first fixed seat 11 and the second fixed seat 12 fastened on the side wall of the exhaust pipe 1 are rotatably connected to the first fixed seat 11 and the second fixed seat 12 and pass through the shaft of the side wall of the exhaust pipe 1 rod 2; the valve plate 3 installed in the exhaust pipe 1, the valve plate 3 is fastened to the shaft rod 2; and the reset adjustment device 4 installed outside the exhaust pipe 1, one end of the reset adjustment device 4 is connected to On the shaft 2 , the other end of the reset adjustment device 4 is connected to the exhaust pipe 1 , and the reset adjustment device 4 is arranged coaxially with the shaft 2 .

During specific implementation, as shown in FIG. 3 , it is a schematic diagram of the assembly structure of the tuning valve of the exhaust pipeline in this embodiment. Wherein, the shape of the exhaust pipe 1 is not limited, and can be set as a round pipe, a square pipe or other common pipe body shapes. The exhaust pipe in this embodiment is a cylindrical pipe made of stainless steel.

The first fixing seat 11 and the second fixing seat 12 are two circular platforms made of stainless steel, and are respectively installed on two opposite side walls of the exhaust pipe 1 circumference. The function of the first fixing seat 11 and the second fixing seat 12 is to fix the shaft 3 so that it can rotate around the axis of the shaft 3 itself. In this embodiment, the first fixed base 11 is provided with a through first shaft hole 111, and the second fixed base 12 is provided with a through second shaft hole 121, wherein the second shaft hole 121 of the second fixed base 12 is a stepped hole.

The shaft 2 can be inserted into the above-mentioned first shaft hole 111 and the second shaft hole 121 . The shaft 2 can be a solid rod made of stainless steel, and its diameter is equivalent to the inner diameters of the first shaft hole 111 and the second shaft hole 121 . In order to ensure that the shaft 2 can rotate around its own axis, the shaft 2 is provided with a boss 21 matching the above-mentioned second shaft hole 121 at the end close to the second fixing base 12 . When the shaft 2 is assembled on the first fixed seat 11 and the second fixed seat 12, the shape-matched boss 21 and the stepped hole of the second fixed seat 12 can effectively prevent the shaft 2 from moving along the axis, so that the shaft 2 has only one rotational degree of freedom.

The valve plate 3 is a thin sheet made of stainless steel, and its shape is roughly equivalent to the cross-sectional shape of the exhaust pipe 1 . It is welded on the shaft rod 2 and assembled in the exhaust pipe 1 . The function of the valve plate 3 is that when the exhaust gas produced by the automobile engine passes through the valve plate 3, the valve plate 3 can drive the shaft rod 2 to rotate.

Preferably, ribs 31 are provided on the valve plate 3 . By setting the ribs 31, on the one hand, the rigidity of the valve plate 3 can be improved, and the large plane of force on the valve plate 3 can be reduced, so that the valve plate 3 can still be in a relatively stable state when it is impacted by force, preventing the valve plate 3 from being subjected to air flow. Large vibrations occur on impact.

The reset adjustment device 4 is a structural member used to adjust the opening of the valve plate 3 and perform a return operation, one end of which is connected to the shaft 2 , and the opposite end is connected to the exhaust pipe 1 . In this embodiment, the reset adjustment device 4 is arranged outside the exhaust pipe 1 , which can improve the reliability of the reset adjustment device and reduce the cost of manufacturing the reset adjustment device 4 .

Further, the reset adjustment device 4 includes: a first positioning block 41; a second positioning block 42 fixedly connected to the exhaust pipe 1, wherein the shaft 2 passes through the second positioning block 42 and is fixed with the first positioning block 41 and the elastic element 43, one end of the elastic element 43 is connected to the first positioning block 41, and the other end of the elastic element 43 is connected to the second positioning block 42. The function of the elastic element 43 is to reset the first positioning block 41 when the shaft rod 2 drives it to rotate.

The structure of the first positioning block 41 and the second positioning block 42 are the same, and they are all made of stainless steel components through stamping and flanging. In this embodiment, the shaft 2 is welded to the first positioning block 41 after passing through the first fixing block 11 , the second positioning block 42 and the elastic element 43 . Wherein, the first fixing block 11 and the second positioning block 42 are welded and fixed on the exhaust pipe 1 , and the elastic element 43 is fastened between the two positioning blocks 41 , 42 .

In this embodiment, the reset adjustment device 4 can adjust the opening degree of the valve plate 3 and perform its return operation through the following structure. Please refer to FIG. 5 , which is an enlarged structural schematic diagram of the elastic element 43 of the tuning valve of the exhaust pipe according to the embodiment of the present invention. Wherein: the first notch 411 and the second notch 421 are respectively set on the first positioning block 41 and the second positioning block 42, and the two ends of the elastic element 43 are provided with crotch 431, and the crotch 431 at one end of the elastic element 43 is clamped at the second The first notch 411 of a positioning block 41 , and the hook 431 at the other end of the elastic element 43 is engaged in the notch 421 of the second positioning block 42 . When the hooks 431 at both ends of the elastic element 43 are stressed to twist the elastic element 43, the elastic element 43 will be compressed or stretched. Preferably, the elastic element 43 is a helical spring, and two hooks ( 431 ) are respectively provided at both ends of the helical spring, and the central axis of the helical spring after assembly coincides with the axis of the shaft 2 . Such setting is beneficial to make the shaft 2 quickly return to its position under the action of the coil spring after rotating around its own axis.

In the specific implementation of the exhaust pipeline tuning valve in this embodiment, since the first fixing block 11 and the second positioning block 42 are welded and fixed on the exhaust pipe 1, the shaft rod 2 passes through the first fixing block accordingly. 11. The second positioning block 42 and the elastic element 43 are then welded to the first positioning block 41, and the two ends of the elastic element 43 are held in the first notch 411 and the second positioning block 41 of the first positioning block 41 by hooks 431 respectively. In the second notch 421 of the block 42 . When the exhaust gas produced by the automobile engine passes through the valve plate 3, the valve plate 3 can drive the shaft rod 2 to rotate, and the shaft rod 2 will drive the first positioning block 41 to rotate, and the relative position of the first positioning block 41 and the second positioning block 42 will change. Make the elastic element 43 in between be in stretched or compressed state. In this way, when the airflow in the exhaust pipe 1 becomes smaller, the elastic force generated by the elastic element 43 will make the first positioning block 41 and the second positioning block 42 connected to the hook 431 return to their positions. During this process, the opening angle of the valve plate 3 can be kept small at the stage of low engine speed, and the tuning valve can obtain better acoustic performance by keeping the flow cross-sectional area consistent with the optimal cross-sectional area required for noise reduction; At the same time, the opening angle of the valve plate 3 can be increased with the increase of the engine speed or the increase of the exhaust flow, and can meet the back pressure requirement of the engine, and ensure the acoustic performance under a small sound-absorbing volume. That is to say, by controlling the opening time and angle of the tuning valve to control the cross-sectional area of the airflow passing through the pipeline, the processing noise is lower in the middle and low speed stages, and the power loss is reduced in the high speed stage.

Preferably, the axis of the shaft 2 is deviated from the center of the valve plate 3 to reduce the back pressure of the exhaust system of the automobile. During specific implementation, the welding position of the valve plate 3 and the shaft rod 2 is uncertain, and it can be adjusted according to different vehicle models. In this embodiment, the distance between the shaft rod 2 and the center position of the valve plate 3 is about 25mm, which is beneficial to eliminate abnormal vibration and sound on the basis of meeting the engine back pressure requirement.

Referring to FIG. 4 , it is a schematic diagram of the internal structure of the tuning valve of the exhaust pipeline in this embodiment. The valve plate 3 is provided with a mass block 5 for adjusting the vibration frequency of the tuning valve, and the mass of the mass block 5 and its relative position on the valve plate 3 are adjustable. In this embodiment, the cross-section of the mass block 5 is circular or elliptical, which is convenient for determining the centroid of the mass block 5, and also facilitates its welding on the valve plate 3 and selection into a simple welding process.

The unexpected technical effect of using the tuning valve in eliminating vibration and noise in this embodiment will be described below based on experimental data.

As shown in FIG. 6 , it is a schematic diagram of the comparison of the total noise of the tailpipe before and after the exhaust pipe tuning valve is adopted in this embodiment. Among them, curve a is the schematic loudness curve at the corresponding speed when a vehicle is not equipped with an exhaust pipeline tuning valve; curve b is the corresponding loudness curve when the vehicle is equipped with an exhaust pipeline tuning valve without mass blocks The loudness schematic curve at the speed; curve c is the loudness schematic curve at the corresponding speed when the vehicle is equipped with an exhaust pipe tuning valve with a mass block. It can be seen from the figure that the tailpipe noise can be greatly reduced by adding the tuning valve, and can be further reduced by adding the mass block, which shows that the tuning valve of this embodiment can indeed improve the acoustic effect.

Please refer further to FIG. 7 , which is a schematic diagram of the comparison of the second-order noise before and after using the exhaust pipe tuning valve in this embodiment. Curve f, curve p, and curve q respectively represent the same model when the exhaust pipe tuning valve is not equipped, when the exhaust pipe tuning valve is not equipped with a mass block, and when the exhaust line tuning valve is equipped with a mass block. Schematic curve of the second-order noise at the corresponding speed when the pipeline tunes the valve. It can be seen from the figure that the second-order noise of the automobile tailpipe can be significantly reduced after adding the tuning valve of the exhaust pipe. By adding a mass block to the tuning valve, the effect of the exhaust pipe on eliminating abnormal noise can be better and more obvious . In addition, the applicant also found that because of different vehicle models and different engine configurations, the tuning valve without the mass block 5 in this embodiment may produce the problem of abnormal vibration of the elastic element, such as a 1.8L model of GAC, the engine is There is an abnormal sound when the rotating speed is 2700rpm, and the abnormal sound is mainly caused by the resonance of the rotatable components such as the rotating shaft 2 and the elastic element 43 of the tuning valve under the action of the 2700rpm airflow, causing the abnormal sound. During implementation, the resonance point can be avoided by adding the mass block 5, and the abnormal sound disappears.

Please refer to FIG. 8 , which is a schematic diagram of the comparison of the back pressure before and after the tuning valve of the exhaust pipeline in this embodiment. Among them, curve m and curve n respectively represent the back pressure schematic curves of the same model when the exhaust pipe tuning valve is not equipped and when the exhaust pipe tuning valve is equipped with a mass block. It can be seen from the figure that adding the tuning valve of the exhaust pipeline will not significantly increase the back pressure of the exhaust pipeline, and will not affect the overall performance of the exhaust system.

In other embodiments of the tuning valve of the exhaust pipeline of the present invention, the mass block 5 may also be set in other common shapes. The shape, mass and position of the mass block 5 are mainly determined by factors such as the flow velocity and flow rate of the airflow, the diameter of the exhaust pipe, the stiffness of the cylindrical spring, and the quality of the valve plate. Therefore, in this embodiment, the counterweight mass of the mass block 5 and its relative position on the valve plate 3 are adjustable, which can expand the adaptation range of the exhaust pipe tuning valve and meet the needs of various vehicle types.

The present invention also discloses an exhaust pipeline. The exhaust pipeline is equipped with the above-mentioned exhaust pipeline tuning valve structure. .

The exhaust pipe tuner valve and the exhaust pipe of the present invention have the following beneficial effects: since the shaft runs through the side wall of the exhaust pipe and is rotatably connected to the two fixed seats, the shaft is fastened and connected with a The valve plate inside the exhaust pipe is equipped with a reset adjustment device coaxially arranged with the shaft rod outside the exhaust pipe. When the exhaust gas of the engine passes through the above-mentioned tuning valve on the exhaust pipeline, the valve plate will be pushed to drive the shaft to rotate. Among them, at the stage of low engine speed, the opening angle of the valve plate can be kept small. At this time, the flow cross-sectional area is consistent with the optimal cross-sectional area required for noise reduction, which can maintain good acoustic performance; at the same time, the valve plate can be adjusted with the engine speed. The opening angle is increased due to the rise of the engine or the increase of the exhaust flow, which meets the requirements of the engine back pressure and can ensure the acoustic performance under a small silencing volume. In addition, it is convenient to arrange the tuning valve on the exhaust pipe, and the effect of improving the total noise and second-order noise of the tailpipe is obvious; the reset adjustment device is arranged outside the exhaust pipe, which improves the reliability of the reset adjustment device and can reduce all The cost of materials used; the NVH performance of the tuning valve is further improved by adding a mass block to the valve plate.

Claims (10)

1. An exhaust pipeline tuning valve, characterized in that, comprising: The first fixing seat (11) and the second fixing seat (12) fastened on the side wall of the exhaust pipe (1); A shaft (2) that is rotatably connected to the first fixed seat (11) and the second fixed seat (12) and runs through the side wall of the exhaust pipe (1); a valve plate (3) installed in the exhaust pipe (1), and the valve plate (3) is fixedly connected to the shaft rod (2); and The reset adjustment device (4) installed outside the exhaust pipe (1), one end of the reset adjustment device (4) is connected to the shaft (2), and the other end of the reset adjustment device (4) Connected to the exhaust pipe (1), the reset adjusting device (4) is arranged coaxially with the shaft (2). 2. The exhaust pipeline tuning valve according to claim 1, characterized in that, the reset adjustment device (4) comprises: first positioning block (41); The second positioning block (42) fixedly connected to the exhaust pipe (1), wherein the shaft (2) passes through the second positioning block (42) and connects with the first positioning block (41) fixed connection; and An elastic element (43), one end of the elastic element (43) is connected with the first positioning block (41), and the other end of the elastic element (43) is connected with the second positioning block (42). 3. The tuning valve for exhaust pipeline according to claim 2, characterized in that, the first positioning block (41) is provided with a first notch (411), and the second positioning block (42) is provided with a The second notch (421), the two ends of the elastic element (43) are provided with a hook (431), and the hook (431) at one end of the elastic element (43) is clamped on the first positioning block (41 ), the hook (431) at the other end of the elastic element (43) is engaged in the notch (421) of the second positioning block (42). 4. The tuning valve of the exhaust pipeline according to claim 3, characterized in that, the elastic element (43) is a coil spring, and the central axis of the coil spring is parallel to the axis of the shaft (2). coincide. 5. The exhaust pipe tuning valve according to any one of claims 1-4, characterized in that, the axis of the shaft (2) is deviated from the center of the valve plate (3). 6. The tuning valve of the exhaust pipeline according to any one of claims 1-4, characterized in that, a mass block (5) is provided on the valve plate (3). 7. The tuning valve of the exhaust pipeline according to claim 6, characterized in that, the cross section of the mass block (5) is circular or elliptical. 8. The tuning valve of the exhaust pipeline according to claim 1, characterized in that, the valve plate (3) is provided with ribs (31). 9. The tuning valve for exhaust pipeline according to claim 1, characterized in that, a boss (21) is provided at the end of the shaft (2) close to the second fixing seat (12), so that The second fixing seat (12) is provided with a stepped hole matching the boss (21). 10. An exhaust pipeline, comprising an exhaust pipe (1), characterized in that the exhaust pipe (1) is provided with an exhaust pipeline tuning valve according to any one of claims 1-9 .