An exhaust valve

Abstract

The present invention provides an exhaust valve, comprising: a valve body, disposed at one end of a pipe and fixedly connected to one end of the pipe with the outer ring of the valve body, an exhaust hole is provided in the middle of the valve body, and at least one first connection hole is further provided on the valve body; a convex portion is provided on one side of the valve body facing the inside of the pipe; a valve cover, disposed inside the pipe, a gap is provided between the valve cover and the inner wall of the pipe; a second connection hole is provided on the valve cover; the second connection hole and the first connection hole are arranged in one-to-one correspondence; an elastic connection assembly, configured to pass through the second connection hole and the first connection hole, and make the valve cover closely adhere to the convex portion on the valve body through a preset elastic pre-tightening force. In the present application, the exhaust valve has a simple structure and is easy to install. When the gas flow rate is small, the valve cover is not easily opened, achieving the NVH performance at medium and low frequencies. When the gas flow rate is large, the valve cover opens axially, and the gas can be discharged, occupying a small space and being convenient to use.

Description

Technical Field

[0001] The present invention belongs to the technical field of automotive exhaust system NVH, and particularly relates to an exhaust valve. Background Art

[0002] As drivers seek a more comfortable driving experience, the demand for noise suppression in automobiles has gradually increased. As a core component of the automotive muffling unit, the exhaust passive valve plays a very important role in the control of medium and low-frequency noise.

[0003] Currently, the existing exhaust passive valve products on the market have a single structural form, and most of the spring parts in the exhaust passive valve are designed on the left and right sides of the valve body. This structure occupies a large amount of space in the muffler body, affects the layout of the internal pipelines of the body, restricts the structural innovation of the pipelines, and in addition, the elastic parts mainly use the form of torsion springs to realize the opening and closing of the valve. During the processing and manufacturing process, it is difficult to control the consistency of the initial torsion force, increasing the probability of generating scrap parts. The exhaust passive valve product has many parts, a complex structure, many mating dimensions, and a high design cost, which affects the reliability of the valve during actual operation. The product lacks the running-in effect of grease inside, and after long-term use, it will cause wear and generate abnormal noises, which all limit the performance improvement of the internal components of the muffler. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies existing in the prior art and provide an exhaust valve with a simple structure, small occupied space, and high consistency of initial pre-tightening force. To achieve the above technical purposes, the technical solution adopted in the embodiments of the present invention is:

[0005] The embodiments of the present invention provide an exhaust valve, including:

[0006] A valve body, which is arranged at one end of a pipe and the outer ring of the valve body is fixedly connected to one end of the pipe. An exhaust hole is provided in the middle of the valve body, and at least one first connection hole is also provided on the valve body; a convex portion is provided on the side of the valve body facing the inside of the pipe;

[0007] A valve cover, which is arranged inside the pipe, and there is a gap between the valve cover and the inner wall of the pipe; a second connection hole is provided on the valve cover; the second connection hole and the first connection hole are arranged in one-to-one correspondence;

[0008] An elastic connection component, which is used to pass through the second connection hole and the first connection hole, and makes the valve cover closely adhere to the convex portion on the valve body through a preset elastic pre-tightening force;

[0009] A sealing gasket, one end of which is connected to the side of the valve body facing the inside of the pipe, and the other end closely adheres to the valve cover under the action of elastic pre-tightening force; the exhaust hole is located inside the sealing gasket.

[0010] Furthermore, the first connection hole is provided on the convex portion of the valve body.

[0011] Furthermore, there are three convex portions provided on the valve body, and the three convex portions are arranged at equal intervals; correspondingly, there are three connection portions provided on the valve cover, the connection portions are arranged at equal intervals and each connection portion is provided with a second connection hole.

[0012] Furthermore, the elastic connection assembly includes a bolt, a spring, a baffle, and a nut; the bolt sequentially passes through the second connection hole on the valve cover and the first connection hole on the valve body; the baffle and the spring are sequentially sleeved on the bolt; the nut is connected to the outer end of the bolt and pre-compresses the spring so that the baffle closely adheres to the valve body while the inner end of the bolt closely adheres to the valve cover.

[0013] Furthermore, among the three springs, the stiffness of any one spring is less than the stiffness of the other two springs, and the stiffness of the other two springs is equal.

[0014] Furthermore, the bolt includes a tapered section, and the diameter of the tapered section gradually decreases from the end close to the outer end to the end away from the outer end, and the tapered section is used to pass through the second connection hole.

[0015] Furthermore, the elastic connection assembly further includes a shaft gasket, the shaft gasket is sleeved on the bolt, and fills the gap between the bolt and the convex portion of the valve body; and the baffle seals the shaft gasket within the convex portion of the valve body.

[0016] Furthermore, an extension portion is provided on the outer circumference of the valve body, the extension portion extends axially, and the extension portion is used for fixedly connecting with a pipe.

[0017] Furthermore, a pit is also provided on the valve cover.

[0018] The beneficial effects brought by the technical solution provided by the embodiment of the present invention are as follows:

[0019] 1) In this application, the exhaust valve has a simple structure, low cost, and is easy to install. The valve cover is fixedly connected to the bolt, and the bolt is arranged axially. When the gas flow rate is small, the valve cover is not easily opened, achieving the NVH performance at medium and low frequencies. When the gas flow rate is large, the valve cover opens axially, and the gas can be discharged, occupying a small space and being convenient to use.

[0020] 2) A spring is provided in the elastic connection assembly of the exhaust valve in this application. By adjusting the magnitude of the spring pre-tightening force, the consistency of the initial force of the exhaust valve can be ensured, and it can be applied to scenarios under different requirements and standards. The three springs have different stiffnesses. When the gas flow rate is small, the valve cover can be tilted to discharge the gas flow rate, and as the gas flow rate increases, the tilt angle can be changed.

[0021] 3) The raised part in the exhaust valve of this application can store grease to ensure that the elastic connection assembly is lubricated in a timely manner, reduce frictional losses, and extend the service life of the exhaust valve. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of the exhaust valve in the embodiment of the present invention.

[0023] Figure 2 It is a partial cross-sectional view of the exhaust valve in the embodiment of the present invention.

[0024] Figure 3 It is a detailed view of the exhaust valve in the embodiment of the present invention.

[0025] Figure 4 It is a left view of the exhaust valve in the embodiment of the present invention.

[0026] Figure 5 It is a schematic structural diagram of the valve body described in the embodiment of the present invention.

[0027] Figure 6 It is a schematic structural diagram of the valve cover described in the embodiment of the present invention. Detailed Embodiment

[0028] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] The present invention provides an exhaust valve, including:

[0030] A valve body 1, which is arranged at one end of the pipe and the outer circle of the valve body 1 is fixedly connected to one end of the pipe. An exhaust hole 11 is provided in the middle of the valve body 1, and at least one first connection hole 12 is also provided on the valve body 1; a raised part 13 is provided on the side of the valve body 1 facing the inside of the pipe;

[0031] A valve cover 2, which is arranged inside the pipe, and there is a gap between the valve cover 2 and the inner wall of the pipe; a second connection hole 210 is provided on the valve cover 2; the second connection hole 210 is arranged in one-to-one correspondence with the first connection hole 12;

[0032] The elastic connection component 3 is used to pass through the second connection hole 210 and the first connection hole 12, and make the valve cover 2 closely adhere to the convex portion 13 on the valve body 1 through a preset elastic pre-tightening force;

[0033] The sealing gasket 4 has one end connected to the side of the valve body 1 facing the inside of the pipe, and the other end closely adheres to the valve cover 2 under the action of the elastic pre-tightening force; the exhaust hole 11 is located inside the sealing gasket 4.

[0034] In this application, the exhaust valve can be used inside the automotive muffler package, and the pipe can be a muffler pipe or a muffler baffle. In a specific embodiment, as Figure 2 shown, the air flow flows through the pipe from left to right, the valve body 1 is arranged on the left side of the pipe, and the outer ring of the valve body 1 is welded to the pipe, and the valve cover 2 is arranged inside the pipe and on the right side of the valve body 1. As Figure 1 、 Figure 2 and Figure 5 shown, since the exhaust hole 11 is located inside the sealing gasket 4, and since the left end of the sealing gasket 4 is welded to the right side of the valve body 1, and the right end of the sealing gasket 4 closely adheres to the valve cover 2 under the action of the elastic pre-tightening force, when the gas flow rate is small, the air flow cannot enter the pipe, thereby effectively suppressing noise and ensuring the NVH (noise, vibration, and harshness) performance at medium and low frequencies; when the gas flow rate is large, the air flow passes through the exhaust hole 11 and pushes the valve cover 2 to move to the right, so that there is a gap between the right end of the sealing gasket 4 and the valve cover 2. Also, since there is a gap between the valve cover 2 and the inner wall of the pipe, the air flow enters the pipe from the exhaust hole 11 through the gap between the right end of the sealing gasket 4 and the left side of the valve cover 2, and then through the gap between the outer ring of the valve cover 2 and the inner wall of the pipe.

[0035] Furthermore, the first connection hole 12 is arranged on the convex portion 13 of the valve body 1.

[0036] In a specific embodiment, as Figure 2 and Figure 3 shown, the convex portion 13 opens towards the right side of the valve body 1, and the first connection hole 12 is provided at the right end of the convex portion 13.

[0037] Furthermore, three convex portions 13 are provided on the valve body 1, and the three convex portions 13 are arranged at equal intervals; correspondingly, three connection portions 21 are provided on the valve cover 2, the connection portions 21 are arranged at equal intervals, and each connection portion 21 is provided with a second connection hole 210.

[0038] It can be understood that the quantity and position of the connecting portion 21 can be adjusted adaptively, and the quantity and position of the second connecting holes 210 on the connecting portion 21 correspond one by one to the quantity and position of the first connecting holes 12 on the valve body 1. As Figure 6 shown, three of the connecting portions 21 are arranged at equal intervals along the outer ring of the valve cover 2, and the positions of the first connecting holes 12 correspond to the positions of the second connecting holes 210 on the valve cover. Furthermore, the elastic connection assembly 3 passes through the first connecting holes 12 and the second connecting portions 21 and connects the valve body 1 and the connecting portion 21, so that the elastic connection assembly 3 can connect the valve body 1 and the valve cover 2, and this structure can ensure the stability during the opening and closing process of the exhaust valve.

[0039] Furthermore, the elastic connection assembly 3 includes a bolt 31, a spring 32, a baffle 33, and a nut 34; the bolt 31 passes through the second connecting holes 210 on the valve cover 2 and the first connecting holes 12 on the valve body 1 in sequence; the baffle 33 and the spring 32 are sleeved on the bolt 31 in sequence; the nut 34 is connected to the outer end 311 of the bolt 31 and pre-compresses the spring 32, so that the baffle 33 abuts tightly against the valve body 1 while the inner end 312 of the bolt 31 abuts tightly against the valve cover 2.

[0040] In a specific embodiment, as Figure 2 and Figure 3As shown, during installation, the bolt 31 is inserted into the second connection hole 210 and the first connection hole 12 from right to left in sequence. The inner end 312 of the bolt 31 and the valve cover 2 are welded. Then, the baffle 33 and the spring 32 are sleeved on the bolt 31 from left to right in sequence. Finally, a pneumatic knob gun is used to screw the nut 34 onto the bolt 31 from left to right, and the position of the nut 34 on the bolt 31 is adjusted so that the initial state of the spring 32 is in a compressed state. This structure can adjust the magnitude of the initial pre-tightening force of the spring 32. The greater the initial pre-tightening force of the spring, the greater the gas flow required for the valve cover 2 to leave the valve body 1, and vice versa. Finally, the nut 34 and the outer end 311 of the bolt 31 are welded. This structure is stable, easy to adjust, has consistency in use, and has a wide range of applications. When the valve cover 2 and the valve body 1 move away from each other, the spring 32 can drive the valve cover 2 back to the initial position. Specifically, when the gas flow is large, the air flow pushes the valve cover 2 to move to the right. Since the valve cover 2 is fixedly connected to the inner end 312 of the bolt 31, the valve cover 2 drives the bolt 31 to move to the right, and then drives the nut 34 to move to the right. The nut 34 exerts a force on the spring 32, and the spring 32 further deforms and has a tendency to return to its original state. When the gas flow decreases or is zero, the spring 32 returns to the initial state, drives the nut 34 to move to the left, and then drives the bolt 31 and the valve cover 2 to move to the left, so that the valve cover 2 closely adheres to the sealing washer 4. It should be noted that the diameter of the bolt 31 can be smaller than the inner diameter of the baffle 33, which is beneficial to the movement of the bolt 31 and avoids the phenomenon of jamming when the bolt 31 moves. Since the nut 34 is fixedly connected to the outer end 311 of the bolt 31, the elastic connection assembly 3 can limit the interval between the valve body 1 and the valve cover 2.

[0041] Further, among the three springs 32, the stiffness of any one of the springs 32 is less than that of the other two springs 32, and the stiffnesses of the other two springs 32 are equal.

[0042] When the gas flow gradually increases, the connecting portion 21 at the position where the spring 32 has a smaller stiffness first leaves the protruding portion 13 at the corresponding position, and then the valve cover 2 tilts, which is beneficial to the gas entering the interior of the pipe. Due to the different stiffnesses of the springs, as the deformation of the springs increases, this structure can be beneficial for the valve cover 2 to generate different tilting angles.

[0043] Further, the bolt 31 includes a tapered section 313, and the diameter of the tapered section 313 gradually decreases from the end close to the outer end 311 to the end away from the outer end 311. The tapered section 313 is used to pass through the second connection hole 210.

[0044] It can be understood that, as Figure 3 shown, when the gas flow rate gradually increases, the valve cover 2 tilts and drives the bolt 31 to tilt. When the gas flow rate further increases, the valve cover 2 moves axially. Since the tapered section 313 on the bolt 31 gradually narrows from left to right, interference between the bolt 31 and the second connection hole 210 can be avoided, which is beneficial for the axially moving of the tilted valve cover 2.

[0045] Furthermore, the elastic connection assembly 3 further includes a shaft gasket 14. The shaft gasket 14 is sleeved on the bolt 31 and fills the gap between the bolt 31 and the convex portion 13 of the valve body 1; and the baffle 33 encloses the shaft gasket 14 within the convex portion 13 of the valve body 1.

[0046] In a specific embodiment, as Figure 2 and Figure 3 shown, during installation, first sleeve the shaft gasket 14 onto the bolt 31 from left to right and insert it into the gap between the bolt 31 and the convex portion 13 of the valve body 1, and then sleeve the baffle 33 onto the bolt 31. The shaft gasket 14 can support the bolt 31 and ensure the axial movement of the bolt 31, avoiding the radial wobbling of the bolt 31. This structure increases the stability of the opening and closing operation of the exhaust valve.

[0047] During the use of the exhaust valve, lubricating grease can be applied in the convex portion 13. Since the spring is always in a contracted state, the right end of the spring can always abut against the baffle 33 and make the baffle 33 abut against the valve body 1. This structure is beneficial for the storage of lubricating grease in the convex portion 13, thereby reducing the friction generated when the bolt 31 moves, reducing the noise generated during the operation of the exhaust valve, and extending the service life of the exhaust valve.

[0048] Furthermore, an extension portion 15 is provided on the outer circle of the valve body 1. The extension portion 15 extends axially and is used for fixedly connecting with a pipe.

[0049] In a specific embodiment, as Figure 2 and Figure 5 shown, the extension portion 15 extends towards the right, and the inner wall of the extension portion 15 is welded to the outer wall of the pipe. In another specific embodiment, the outer wall of the extension portion 15 is welded to the inner wall of the pipe.

[0050] Furthermore, a pit 22 is also provided on the valve cover 2.

[0051] In a specific embodiment, as Figure 2 andFigure 4 As shown, when the gas flow rate is relatively large, the back pressure of the exhaust valve is relatively large, and the pit 22 can improve the strength of the valve cover 2.

[0052] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the examples, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An exhaust valve, characterized in that, Comprising: A valve body (1) is provided at one end of a pipe, and the outer ring of the valve body (1) is fixedly connected to one end of the pipe. An exhaust hole (11) is provided in the middle of the valve body (1), and at least one first connection hole (12) is further provided on the valve body (1); a convex portion (13) is provided on the side of the valve body (1) facing the inside of the pipe; the first connection hole (12) is provided on the convex portion (13) of the valve body (1). A valve cover (2) is arranged inside the pipe, and there is a gap between the valve cover (2) and the inner wall of the pipe; a second connection hole (210) is provided on the valve cover (2); the second connection hole (210) is arranged in one-to-one correspondence with the first connection hole (12). An elastic connection assembly (3) is used to pass through the second connection hole (210) and the first connection hole (12), and make the valve cover (2) closely attached to the convex portion (13) on the valve body (1) through a preset elastic pre-tightening force. The elastic connection assembly (3) includes a bolt (31), a spring (32), a baffle (33), and a nut (34); the bolt (31) sequentially passes through the second connection hole (210) on the valve cover (2) and the first connection hole (12) on the valve body 1; the baffle (33) and the spring (32) are sequentially sleeved on the bolt (31); the nut (34) is connected to the outer end (311) of the bolt (31) and pre-compresses the spring (32), so that the baffle (33) is closely attached to the valve body (1) while the inner end (312) of the bolt (31) is closely attached to the valve cover (2). A sealing gasket (4), one end of which is connected to the side of the valve body (1) facing the inside of the pipe, and the other end is closely attached to the valve cover (2) under the action of elastic pre-tightening force; the exhaust hole (11) is located inside the sealing gasket (4).

2. The exhaust valve according to claim 1, wherein Three convex portions (13) are provided on the valve body (1), and the three convex portions (13) are arranged at equal intervals; correspondingly, three connection portions (21) are provided on the valve cover (2), the connection portions (21) are arranged at equal intervals, and each connection portion (21) is provided with one second connection hole (210).

3. The exhaust valve according to claim 2, wherein Among the three springs (32), the stiffness of any one spring (32) is less than the stiffness of the other two springs (32), and the stiffness of the other two springs (32) is equal.

4. The exhaust valve according to claim 1, wherein The bolt (31) includes a tapered section (313), and the diameter of the tapered section (313) gradually decreases from one end close to the outer end (311) to the end far from the outer end (311). The tapered section (313) is used to pass through the second connection hole (210).

5. The exhaust valve according to claim 1, wherein The elastic connection component (3) further includes a shaft bushing (14). The shaft bushing (14) is sleeved on the bolt (31) and fills the gap between the bolt (31) and the convex portion (13) of the valve body (1). And the baffle (33) encloses the shaft bushing (14) within the convex portion (13) of the valve body (1).

6. The exhaust valve according to claim 1, wherein an extension portion (15) is provided on the outer circumference of the valve body (1). The extension portion (15) extends axially and is used for fixedly connecting with a pipe.

7. The exhaust valve according to claim 1, wherein a pit (22) is further provided on the valve cover (2).

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