Exhaust system pre-silencer and exhaust system

Abstract

The invention provides an exhaust system pre-silencer and an exhaust system. The exhaust system pre-silencer comprises an air inlet pipe, an outer barrel, an air outlet end cover, an air outlet pipe and an inner barrel. The air inlet pipe, the outer cylinder body, the air outlet end cover and the air outlet pipe are connected in sequence, and the inner cylinder body is arranged in the outer cylinder body; the other end of the air inlet pipe is welded and fixed with one end of the outer cylinder body, a gasket is arranged on the outer surface of one end of the inner cylinder body, the gasket is in clearance fit with the outer cylinder body, and a deformation gap exists between the end part of the air inlet pipe and the end part of the inner cylinder body in the axial direction; and the other end of the inner cylinder body, the other end of the air outlet end cover and one end of the air outlet pipe are welded and fixed. By the adoption of the front silencer of the exhaust system, abnormal sound caused by collision of the inner barrel and the outer barrel of the silencer in the automobile running process can be avoided, and the thermal fatigue fracture condition of the exhaust pipe can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile exhaust systems, in particular to an exhaust system front muffler and an exhaust system. Background Art

[0002] At present, the exhaust temperature of automobiles is generally high, and the temperature of the front muffler of some exhaust systems is also above 750℃.

[0003] The front muffler of the exhaust system is prone to expansion of the exhaust pipe at high temperatures, causing thermal fatigue fracture of the exhaust pipe.

[0004] Especially when there is silencer cotton in the front muffler pipe, on the one hand, the silencer cotton can effectively reduce the noise, but it will also greatly weaken the heat dissipation of the muffler exhaust pipe, causing the temperature of the exhaust pipe inside the muffler to rise. The exhaust pipe expands axially at high temperature, and the exhaust pipe inside the muffler is prone to thermal fatigue fracture failure, which causes abnormal noise in the muffler and affects the NVH performance of the car.

[0005] In view of the above situation, a front muffler is needed to improve the thermal fatigue fracture of the exhaust pipe in the muffler. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides an exhaust system front muffler and an exhaust system, which can not only prevent the inner and outer cylinders of the muffler from colliding with each other during the driving of the car and causing abnormal noise, but also reserve an expansion gap for the free expansion of the inner cylinder at high temperature, reduce the stress on the exhaust pipe, and improve the thermal fatigue fracture of the exhaust pipe. The technical solution adopted by the present invention is: A front muffler of an exhaust system comprises an air inlet pipe, an outer cylinder, an air outlet end cover, an air outlet pipe and an inner cylinder; The air inlet pipe, the outer cylinder, the air outlet end cover, and the air outlet pipe are connected in sequence, and the inner cylinder is arranged inside the outer cylinder; The other end of the air intake pipe is welded and fixed to one end of the outer cylinder, a gasket is provided on the outer surface of one end of the inner cylinder, the gasket is gap-matched with the outer cylinder, and there is a deformation gap between the end of the air intake pipe and the end of the inner cylinder in the axial direction; The other end of the inner cylinder, the other end of the air outlet end cover, and one end of the air outlet pipe are welded and fixed.

[0007] Furthermore, one end of the outer cylinder is gradually closed to form a first contraction section, an outer cylinder middle diameter section, a second contraction section and an outer cylinder small diameter section which are sequentially connected, and the outer cylinder middle diameter section and the outer cylinder small diameter section are coaxially arranged; The small diameter section of the outer cylinder is welded and fixed to the air inlet pipe, and the middle diameter section of the outer cylinder is clearance-matched with the gasket.

[0008] Furthermore, the inner cylinder includes a first straight segment, a bent segment, and a second straight segment connected in sequence, the first straight segment is coaxially arranged with the air inlet pipe, the second straight segment is coaxially arranged with the air outlet pipe, and the air inlet pipe is not coaxial with the air outlet pipe.

[0009] Furthermore, the other end of the second straight segment expands outward to form a flared segment, and the other end of the outlet end cover gradually closes inward to form a third contraction segment and an end cover small diameter segment connected in sequence, and the flared segment, the end cover small diameter segment and the outlet pipe are welded and fixed.

[0010] Furthermore, a support member is connected between the first straight line segment and the outer cylinder; The support member divides the space between the outer cylinder and the inner cylinder into a first chamber and a second chamber, the first chamber is filled with a first sound-absorbing cotton, and the second chamber is filled with a second sound-absorbing cotton; A first sound-absorbing hole portion corresponding to the first sound-absorbing cotton is arranged on the outer surface of the first straight line segment, and a second sound-absorbing hole portion corresponding to the second sound-absorbing cotton is arranged on the outer surface of the second straight line segment.

[0011] Furthermore, the support member includes a support body, an inner flange and an outer flange. The support body is in the shape of an annular sheet and is supported between the outer cylinder and the first straight line segment. The inner flange is arranged at the inner edge of the support body and is gap-fitted with the first straight line segment. The outer flange is arranged at the outer edge of the support body and is transitionally fitted with the outer cylinder.

[0012] Furthermore, the surface of the support body is protruding outwardly and is provided with annular reinforcing ribs.

[0013] Furthermore, a plurality of small holes are arranged on the surface of the supporting body.

[0014] An exhaust system, including a front muffler of the exhaust system.

[0015] Advantages of the present invention: Only the intake pipe and the outer cylinder are welded and fixed, the inner cylinder and the intake pipe are arranged at an interval, and a gasket is installed outside the inner cylinder to prevent collision between the inner and outer cylinders in the car and cause abnormal noise. On the other hand, it ensures that the inner cylinder has an axial expansion distance at high temperature, so that the exhaust pipe is less stressed and the thermal fatigue deformation is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structural composition of the present invention.

[0017] Figure 2 It is a cross-sectional view of the present invention.

[0018] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0019] Figure 4 for Figure 2 A partial enlarged view of point B in the middle.

[0020] Figure 5 This is a structural diagram of the support.

[0021] In the figure: 100-inlet pipe, 200-outer cylinder, 210-first contraction section, 220-outer cylinder middle diameter section, 230-second contraction section, 240-outer cylinder small diameter section, 300-outlet end cover, 310-third contraction section, 320-end cover small diameter section, 400-outlet pipe, 500-inner cylinder, 510-first straight section, 511-first silencer hole, 520-bending section, 530-second straight section, 531-second silencer hole, 540-expansion section, 600-washer, 700-support member, 710-support body, 720-inner flange, 730-outer flange, 740-reinforcement rib, 750-small hole, 800-first silencer cotton, 900-second silencer cotton. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying 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.

[0023] Please refer to the attached Figure 1 -Attached Figure 5 The present application first proposes a front muffler of an exhaust system and an exhaust system, comprising an intake pipe 100, an outer cylinder 200, an outlet end cover 300, an outlet pipe 400, and an inner cylinder 500; the intake pipe 100, the outer cylinder 200, the outlet end cover 300, and the outlet pipe 400 are connected in sequence, and the inner cylinder 500 is arranged inside the outer cylinder 200; the other end of the intake pipe 100 is welded and fixed to one end of the outer cylinder 200, and a gasket 600 is arranged on the outer surface of one end of the inner cylinder 500, and the gasket 600 is gap-matched with the outer cylinder 200, and there is a deformation gap in the axial direction between the end of the intake pipe 100 and the end of the inner cylinder 500; the other end of the inner cylinder 500, the other end of the outlet end cover 300, and one end of the outlet pipe 400 are welded and fixed.

[0024] In the prior art, the intake pipe 100, the outer cylinder 200, and the inner cylinder 500 are usually welded together. The inner cylinder 500 has no axial expansion distance. During the operation of the entire exhaust system, the end of the inner cylinder 500 will deform along the axial direction when thermal fatigue occurs. Therefore, the connection between the intake pipe and the inner and outer cylinders is a high-risk area for thermal fatigue fracture. Once the inner cylinder fractures and fails, the inside of the muffler will make abnormal noises as the car runs, affecting the NVH performance of the car.

[0025] As attached Figure 2 and attached Figure 3 As shown, as an embodiment of the present application, the right end of the air inlet pipe 100 is connected to the left end of the outer cylinder 200, the left end of the air outlet end cover 300 is welded and fixed to the right end of the outer cylinder 200, and the right end of the outer cylinder 200 is welded and fixed to the left end of the air outlet pipe 400 and the right end of the inner cylinder 500. The outer diameter of the right end of the air inlet pipe 100 is smaller than the outer diameter of the left end of the outer cylinder 200. After the right end of the air inlet pipe 100 is inserted into the left end of the outer cylinder 200, the two are welded and fixed by welding. At this time, there is a certain distance (i.e., deformation gap) between the left end of the inner cylinder 500 and the air inlet pipe 100. In addition, the clearance between the gasket 600 and the outer cylinder 200 shortens the radial distance between the inner cylinder 500 and the outer cylinder 200, and also realizes that the left end of the inner cylinder 500 is neither in direct contact with the outer cylinder 200 nor in contact with the air inlet pipe 100. In this way, during the driving of the car, the gasket 600 prevents the inner cylinder 500 and the outer cylinder 200 from colliding and causing abnormal noise, and also allows the inner cylinder 500 to expand freely in the axial direction at high temperature, especially avoiding thermal fatigue fracture at the connection between the intake pipe 100 and the outer cylinder 200.

[0026] Please refer to the attached Figure 3 One end of the outer cylinder 200 gradually closes to form a first contraction section 210, an outer cylinder middle diameter section 220, a second contraction section 230 and an outer cylinder small diameter section 240 which are sequentially connected. The outer cylinder middle diameter section 220 and the outer cylinder small diameter section 240 are coaxially arranged; the outer cylinder small diameter section 240 is welded and fixed to the intake pipe 100, and the outer cylinder middle diameter section 220 is clearance-matched with the gasket 600.

[0027] Specifically, the first contraction section 210 and the second contraction section 230 form a bell-mouth structure at both ends, so that the clearance between the inner diameter of the middle diameter section 220 of the outer cylinder and the outer diameter of the gasket 600 is matched, and the Figure 2 It can be seen that the length of the middle diameter section 220 of the outer cylinder is greater than the length of the gasket 600, which reserves sufficient deformation gap for the expansion of the inner cylinder 500 and guides the expansion movement of the inner cylinder 500. When the inner cylinder 500 expands to a certain length, the second contraction section 230 can block the gasket 600 to prevent the inner cylinder 500 from squeezing the intake pipe 100.

[0028] Please refer to the attached Figure 2 The inner cylinder 500 includes a first straight segment 510, a bent segment 520 and a second straight segment 530 which are connected in sequence. The first straight segment 510 is coaxially arranged with the air inlet pipe 100, and the second straight segment 530 is coaxially arranged with the air outlet pipe 400. The air inlet pipe 100 and the air outlet pipe 400 are not coaxial.

[0029] In a specific embodiment, rounded transition zones are formed between the bending section 520 of the inner cylinder 500 and the first straight section 510 and between the second straight section 530 to ensure the connectivity between the sections in the inner cylinder 500. The bending section 520 is used to realize the non-coaxial arrangement between the first straight section 510 and the second straight section 530 to adapt to the non-coaxial installation requirements of the air inlet pipe 100 and the air outlet pipe 400.

[0030] To meet the sealing and welding requirements of the muffler outlet, please refer to the attached Figure 4 The other end of the second straight line segment 530 expands outward to form a flared segment 540, and the other end of the outlet end cover 300 gradually closes inward to form a third contraction segment 310 and an end cover small diameter segment 320 connected in sequence, and the flared segment 540, the end cover small diameter segment 320 and the outlet pipe 400 are welded and fixed.

[0031] Specifically, the air outlet end cover 300 is an eccentric end cover, the left end of which is a large diameter section, which is fixed to the outer cylinder 200 by one weld, and the right end is an end cover small diameter section 320, which is fixed to the flared section 540 and the air outlet pipe 400 by one weld, thereby meeting the coaxial installation requirements between the air outlet pipe 400 and the inner cylinder 500.

[0032] In the present application, in order to achieve support of the inner cylinder 500 in the outer cylinder 200, a support member 700 is connected between the first straight segment 510 and the outer cylinder 200; the support member 700 divides the space between the outer cylinder 200 and the inner cylinder 500 into a first chamber and a second chamber, the first chamber is filled with a first sound-absorbing cotton 800, and the second chamber is filled with a second sound-absorbing cotton 800; a first sound-absorbing hole portion 511 corresponding to the first sound-absorbing cotton 800 is provided on the outer surface of the first straight segment 510, and a second sound-absorbing hole portion 531 corresponding to the second sound-absorbing cotton 800 is provided on the outer surface of the second straight segment 530.

[0033] As attached Figure 2 and attached Figure 5As shown, in the present application, since the right end of the inner cylinder 500 is fixed to the air outlet end cover 300 and the air outlet pipe 400, and the left end is a free end, a support member 700 is provided at the first straight section 510 near the left end of the inner cylinder 500 to support the inner cylinder 500, thereby saving the number of support members 700 used; at the same time, the first sound-absorbing cotton 800 and the second sound-absorbing cotton 900 filled in the two chambers formed on both sides of the support member 700 can respectively cooperate with the first sound-absorbing hole portion 511 and the second sound-absorbing hole portion 531 to achieve the effect of eliminating standing waves and reducing flow noise.

[0034] As an embodiment of the present application, the first sound-absorbing hole portion 511 and the second sound-absorbing hole portion 531 are respectively composed of a plurality of sound-absorbing holes.

[0035] In a specific embodiment, as shown in the attached Figure 5 As shown, the support member 700 includes a support body 710, an inner flange 720 and an outer flange 730. The support body 710 is in the shape of an annular sheet and is supported between the outer cylinder 200 and the first straight line segment 510. The inner flange 720 is arranged at the inner edge of the support body 710 and is gap-fitted with the first straight line segment 510. The outer flange 730 is arranged at the outer edge of the support body 710 and is transitionally fitted with the outer cylinder 200.

[0036] In this embodiment, the inner flange 720 and the outer flange 730 are used to increase the contact area between the support member 700 and the inner and outer cylinders, improve the support stability of the inner cylinder 500, and make the plane where the support body 710 is located perpendicular to the axis of the first straight line segment 510, so as to prevent the support body 710 from tilting and increasing the installation error between the inner cylinder 500 and the outer cylinder 200 and the air outlet end cover 300.

[0037] Furthermore, in order to improve the structural strength of the support member 700 , an annular reinforcing rib 740 is provided on the surface of the support body 710 protruding outward.

[0038] Furthermore, in order to connect the first chamber and the second chamber and improve the noise reduction effect, a plurality of small holes 750 are provided on the surface of the support body 710 .

[0039] On the other hand, the present application also provides an exhaust system, including the above-mentioned front muffler of the exhaust system. Applying the above-mentioned front muffler to the exhaust system can avoid the collision between the inner and outer cylinders of the muffler during driving of the car, thereby preventing abnormal noise and improving the thermal fatigue fracture of the exhaust pipe.

[0040] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A front muffler for an exhaust system, characterized in that: It comprises an air inlet pipe (100), an outer cylinder (200), an air outlet end cover (300), an air outlet pipe (400), and an inner cylinder (500); The air inlet pipe (100), the outer cylinder (200), the air outlet end cover (300), and the air outlet pipe (400) are connected in sequence, and the inner cylinder (500) is arranged inside the outer cylinder (200); The other end of the air intake pipe (100) is welded and fixed to one end of the outer cylinder (200); a gasket (600) is provided on the outer surface of one end of the inner cylinder (500); the gasket (600) and the outer cylinder (200) are clearance-matched; and a deformation gap exists between the end of the air intake pipe (100) and the end of the inner cylinder (500) in the axial direction; The other end of the inner cylinder (500), the other end of the gas outlet cover (300), and one end of the gas outlet pipe (400) are welded and fixed.

2. The exhaust system front muffler according to claim 1, characterized in that: One end of the outer cylinder (200) is gradually closed to form a first contraction section (210), an outer cylinder middle diameter section (220), a second contraction section (230) and an outer cylinder small diameter section (240) which are connected in sequence, and the outer cylinder middle diameter section (220) and the outer cylinder small diameter section (240) are coaxially arranged; The outer cylinder small diameter section (240) is welded and fixed to the air intake pipe (100), and the outer cylinder medium diameter section (220) is clearance-matched with the gasket (600).

3. The exhaust system front muffler according to claim 1, characterized in that: The inner cylinder (500) comprises a first straight segment (510), a bent segment (520), and a second straight segment (530) which are sequentially connected; the first straight segment (510) is coaxially arranged with the air inlet pipe (100); the second straight segment (530) is coaxially arranged with the air outlet pipe (400); and the air inlet pipe (100) and the air outlet pipe (400) are not coaxial.

4. The exhaust system front muffler according to claim 3, characterized in that: The other end of the second straight section (530) expands outwards to form a flared section (540), and the other end of the outlet end cover (300) gradually closes inwards to form a third contraction section (310) and an end cover small diameter section (320) which are connected in sequence, and the flared section (540), the end cover small diameter section (320) and the outlet pipe (400) are welded and fixed.

5. The exhaust system front muffler according to claim 3, characterized in that: A support member (700) is connected between the first straight line segment (510) and the outer cylinder (200); The support member (700) divides the space between the outer cylinder (200) and the inner cylinder (500) into a first chamber and a second chamber, the first chamber is filled with first sound-absorbing cotton (800), and the second chamber is filled with second sound-absorbing cotton (800); A first sound-absorbing hole portion (511) corresponding to the first sound-absorbing cotton (800) is provided on the outer surface of the first straight line segment (510), and a second sound-absorbing hole portion (531) corresponding to the second sound-absorbing cotton (800) is provided on the outer surface of the second straight line segment (530).

6. The exhaust system front muffler according to claim 5, characterized in that: The support member (700) comprises a support body (710), an inner flange (720) and an outer flange (730); the support body (710) is in the shape of an annular sheet and is supported between the outer cylinder (200) and the first straight line segment (510); the inner flange (720) is arranged at the inner edge of the support body (710) and is clearance-matched with the first straight line segment (510); and the outer flange (730) is arranged at the outer edge of the support body (710) and is transitionally matched with the outer cylinder (200).

7. The exhaust system front muffler according to claim 6, characterized in that: The surface of the support body (710) is protruding outwards and is provided with an annular reinforcing rib (740).

8. The exhaust system front muffler according to claim 6, characterized in that: The surface of the supporting body (710) is provided with a plurality of small holes (750).

9. An exhaust system, characterized in that: The invention comprises the exhaust system front muffler as claimed in any one of claims 1 to 9.

Images