Automobile exhaust device

Abstract

The utility model discloses an automobile exhaust device, and belongs to the technical field of automobile machining. The exhaust device mainly comprises a catalytic converter, a first silencer, a second silencer and a constant-diameter exhaust pipe are sequentially communicated with the rear portion of the catalytic converter through an exhaust pipeline, exhaust lifting hooks are arranged at the front end and the rear end of the first silencer and the front end and the rear end of the second silencer respectively, exhaust rubber lifting lugs are arranged on the exhaust lifting hooks in a sleeved mode, and threaded ends are arranged at the tails of the exhaust lifting hooks. The threaded end is provided with an exhaust limiting clamping piece used for limiting the exhaust rubber lifting lug, and a plurality of clamping jaw structures matched with the threaded end in a threaded mode are arranged in the exhaust limiting clamping piece. The catalytic converter, the first silencer and the second silencer are longitudinally arranged and are close to an engine and a sound source as much as possible, and the variable-diameter exhaust pipe is additionally arranged behind the second silencer, so that the diameter of the exhaust pipe is increased, the airflow speed and pressure can be changed, and the noise elimination capacity is effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile processing, and in particular relates to an automobile exhaust device. Background Art

[0002] The car exhaust muffler is a device installed on the car exhaust pipe, mainly used to reduce the impact of the exhaust gas emitted by the car on the environment. There are many designs of car exhaust mufflers, the most common ones are metal mesh mufflers, honeycomb mufflers, sheet mufflers, etc. The main function of these mufflers is to absorb and scatter harmful substances in the exhaust gas through porous materials, thereby achieving the purpose of reducing the emission of exhaust pollutants.

[0003] The patent with publication number "CN116557109A" discloses an integrated exhaust silencer device, including an exhaust pipe, a rear silencer, a two-hole flange, a silencer hook, a front silencer, a heat shield with a lap structure and a heat shield with a bellows structure. A stress relief groove is designed on the two-hole flange. After welding, the flange welding deformation is small and the leakage at the flange connection is low. A pier head + limit card structure is adopted at the silencer hook. The limit height can be adjusted according to needs to meet more usage conditions.

[0004] Although the above patent reduces the weight of the hook, it still has the following shortcomings: 1. Since the size of the exhaust hook head is fixed and the head cannot be disassembled, it has the disadvantages of low versatility and high cost; 2. The muffler package is far away from the sound source and the exhaust tail pipe is short, which is not conducive to the silencing of low-frequency noise. 3. The muffler has a poor silencing effect, and the entire exhaust device has high requirements for the layout space of the entire vehicle. Utility Model Content

[0005] The technical problem to be solved by the utility model is: to overcome the deficiencies of the prior art and to provide an automobile exhaust device, wherein a catalytic converter, a first muffler and a second muffler are arranged longitudinally and as close to the engine as possible and close to the sound source, and a variable diameter exhaust pipe is added behind the second muffler to increase the diameter of the exhaust pipe, so that the air flow velocity and pressure can be changed, thereby effectively increasing the noise elimination capability.

[0006] The automobile exhaust device comprises a catalytic converter, and a first muffler, a second muffler and a normal-diameter exhaust pipe are connected in sequence behind the catalytic converter through an exhaust pipe. Exhaust hooks are respectively arranged at the front and rear ends of the first muffler and the second muffler, and exhaust rubber ears are sleeved on the exhaust hooks. A threaded end is arranged at the tail of the exhaust hook, and an exhaust limit card for limiting the exhaust rubber ear is arranged at the threaded end. A plurality of claw structures that cooperate with the threaded end are arranged inside the exhaust limit card.

[0007] Preferably, a variable diameter exhaust pipe is provided between the exhaust pipeline of the second muffler and the normal diameter exhaust pipe, and the maximum diameter of the variable diameter exhaust pipe is 1.5 times the diameter of the normal diameter exhaust pipe.

[0008] Preferably, the total length of the variable diameter exhaust pipe is 90-110 mm, and both ends of the variable diameter exhaust pipe smoothly transition to the normal diameter exhaust pipe and the exhaust pipeline, and the length of the transition section is 15-20 mm.

[0009] Preferably, the second muffler includes an outer shell, a first core tube and a second core tube, the front and rear ends of the outer shell are respectively sealed and fixedly connected with cover plate one and cover plate two, the middle part of the outer shell is sealed and fixedly connected with a middle partition, the two ends of the first core tube respectively pass through cover plate one and the middle partition, the end of the first core tube close to cover plate one is the left end, the left end is provided with an air inlet, the air inlet is connected to the exhaust duct at the front end of the second muffler, the right end of the first core tube is provided with a core tube plug, and the first core tube is located on the left side of the middle partition and has multiple air outlet holes.

[0010] Preferably, the left end of the second core tube passes through the middle partition plate, and the right end of the second core tube passes through the second cover plate, and is connected to the exhaust pipe at the tail of the second muffler.

[0011] Preferably, a partition plate 1 is provided between the cover plate 1 and the middle partition plate, the partition plate 1 is fixedly connected to the inner wall of the shell, and the air inlet end of the second core tube is located on the right side of the partition plate 1.

[0012] Preferably, a partition plate 2 is provided between the middle partition plate and the cover plate 2, the partition plate 2 is fixedly connected to the inner wall of the outer shell, and the second core tube passes through the partition plate 2.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The exhaust limit card and the exhaust hook adopt a detachable design. Compared with the fixed hook head in the prior art, the utility model realizes that the exhaust hook of the same diameter can match the exhaust rubber ears of various diameters, that is, when the diameter of the exhaust rubber ear increases, in order to prevent it from falling out, an exhaust limit card with a larger diameter is selected for limiting, and the exhaust limit card can be disassembled, and the exhaust rubber ear is more convenient to install.

[0015] 2. In the utility model, the catalytic converter, the first muffler and the second muffler are arranged longitudinally and as close to the engine as possible, close to the sound source, and a variable diameter exhaust pipe is added behind the second muffler to increase the diameter of the exhaust pipe, which can change the air flow speed and pressure, thereby effectively increasing the noise elimination capability.

[0016] 3. A middle partition, a first core tube and a second core tube are added to the second muffler. The middle partition divides the second muffler into two independent chambers. On the one hand, the middle partition is used to assist in the installation of the first core tube and the second core tube, and to block and reverse the airflow. On the other hand, it plays a role in reinforcing the second muffler; the first core tube and the second core tube greatly increase the exhaust route and increase the flow distance of the gas in the pipeline, which is more conducive to reducing the sound pressure level at the tail pipe outlet and improving the NVH performance of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The structure of the utility model is shown in FIG. Figure 1 ;

[0018] Figure 2 for Figure 1 A partial enlarged view of part A;

[0019] Figure 3 The structure of the utility model is shown in FIG. Figure 2 ;

[0020] Figure 4 for Figure 3 A partial enlarged view of part B;

[0021] Figure 5 It is a schematic diagram of the external connection between the second muffler and the variable diameter exhaust pipe;

[0022] Figure 6 Schematic diagram of the internal structure of the second muffler.

[0023] In the figure, 1, catalytic converter; 2, first muffler; 3, second muffler; 301, air inlet; 302, first core tube; 303, air outlet; 304, core tube plug; 305, partition one; 306, second core tube; 307, partition two; 308, cover plate two; 309, cover plate one; 310, middle partition; 4, variable diameter exhaust pipe; 5, constant diameter exhaust pipe; 6, exhaust rubber ear; 7, exhaust limit card; 701, claw structure; 8, exhaust hook; 9, threaded end. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings:

[0025] The directional nouns involved in the detailed description paragraphs are only for the convenience of those skilled in the art to understand the technical solutions described in this application according to the visual orientation shown in the accompanying drawings. Unless otherwise clearly specified and limited, the terms "setting", "installation", "connection", etc. should be understood in a broad sense. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0026] like Figures 1 to 6As shown, an automobile exhaust device includes a catalytic converter 1. The catalytic converter 1 is a prior art and will not be described in detail. The rear of the catalytic converter 1 is connected with a first muffler 2, a second muffler 3 and a regular diameter exhaust pipe 5 in sequence through an exhaust pipe. The regular diameter exhaust pipe 5 is a universal exhaust pipe. Exhaust hooks 8 are respectively provided at the front and rear ends of the first muffler 2 and the second muffler 3. The specific installation position of the exhaust hook 8 is the same as that of the prior art and will not be described in detail. An exhaust rubber ear 6 is sleeved on the exhaust hook 8, and a threaded end 9 is provided at the tail of the exhaust hook 8. The threaded end 9 is provided with an exhaust limit card 7 for limiting the exhaust rubber ear 6, and a plurality of claw structures 701 threadably matched with the threaded end 9 are provided inside the exhaust limit card 7. Through the detachable design of the exhaust limit card 7 and the exhaust hook 8, compared with the fixed hook head in the prior art, the present embodiment can make the exhaust hook 8 of the same diameter match the exhaust rubber ears 6 of various diameters. During installation, exhaust limit cards 7 of different diameters are selected to cooperate with the exhaust rubber ears 6. That is, when the diameter of the exhaust rubber ears 6 increases, in order to prevent them from falling out, exhaust limit cards 7 with larger diameters are selected for limiting, thereby realizing the universal use of the exhaust hook 8, and the exhaust limit card 7 can be disassembled, and the exhaust rubber ears 6 are more convenient to install.

[0027] A variable diameter exhaust pipe 4 is provided between the exhaust pipe of the second muffler 3 and the normal diameter exhaust pipe 5, and the maximum diameter of the variable diameter exhaust pipe 4 is 1.5 times the diameter of the normal diameter exhaust pipe 5; during manufacturing, the total length of the variable diameter exhaust pipe 4 is controlled to be 90-110 mm, and the two ends of the variable diameter exhaust pipe 4 smoothly transition with the normal diameter exhaust pipe 5 and the exhaust pipe, and the length of the transition section on each side is controlled to be 15-20 mm. The variable diameter exhaust pipe 4 can change the airflow speed and pressure by increasing the diameter of the exhaust pipe, thereby effectively reducing low-frequency noise.

[0028] like Figure 5 and Figure 6As shown, the second muffler 3 includes a shell, a first core tube 302 and a second core tube 306. The first core tube 302 and the second core tube 306 are both hollow structures. The front and rear ends of the shell are respectively sealed and fixedly connected with a cover plate 1 309 and a cover plate 2 308. The middle part of the shell is sealed and fixedly connected with a middle partition 310. The middle partition 310 divides the second muffler 3 into two independent chambers. The middle partition 310 is used to assist in the installation of the first core tube 302 and the second core tube 306 and to block the airflow. On the other hand, it plays a role in reinforcing the second muffler 3; the two ends of the first core tube 302 respectively penetrate the cover plate 1 309 and the middle partition plate 310, specifically, the left end of the first core tube 302 passes through the cover plate 309, and the left end of the first core tube 302 is provided with an air inlet 301, the air inlet 301 is connected to the exhaust duct at the front end of the second muffler 3, and the right end of the first core tube 302 is provided with a core tube plug 304, the core tube plug 304 seals the right end of the first core tube 302 to prevent gas from being discharged from the right end of the first core tube 302, and the first core tube 302 is located on the left side of the middle partition plate 310 and is provided with a plurality of air outlet holes 303, so that the gas passing through the first core tube 302 enters the chamber on the left side of the second muffler 3 from the plurality of air outlet holes 303.

[0029] The second core tube 306 is arranged in parallel with the first core tube 302, the left end of the second core tube 306 penetrates the middle partition plate 310, the right end of the second core tube 306 penetrates the cover plate 2 308, and is connected to the exhaust pipe at the tail of the second muffler 3; a partition plate 1 305 is arranged between the cover plate 1 309 and the middle partition plate 310, the partition plate 1 305 is fixedly connected to the inner wall of the shell, the air inlet end of the second core tube 306 is located on the right side of the partition plate 1 305, and the air inlet end of the second core tube 306 is located on the left side of the middle partition plate 310, and the second core tube 306 can discharge the gas in the left chamber of the second muffler 3; a partition plate 2 307 is arranged between the middle partition plate 310 and the cover plate 2 308, the partition plate 2 307 is fixedly connected to the inner wall of the shell, and the second core tube 306 penetrates the partition plate 2 307. The partition plates 1 305 and 2 307 are mainly used for supporting and fixing, which further improves the structural stability of the second muffler 3.

[0030] The second muffler 3 greatly increases the exhaust route and the flow distance of the gas in the pipe, which is more conducive to reducing the sound pressure level at the tail pipe outlet and improving the NVH performance of the whole vehicle.

[0031] When the utility model is in use, the automobile exhaust enters the catalytic converter 1 for filtration, enters the first muffler 2 for the first muffler treatment, then enters the first core tube 302 through the air inlet 301, and is discharged through the air outlet 303. At this time, the exhaust gas is reversed, and the diameter of the internal space of the second muffler is much increased compared to the first core tube 302, so that the air flow speed and pressure are changed, thereby playing a role in reducing noise. Then the exhaust gas is discharged through the second core tube 306 and enters the variable diameter exhaust pipe 4. The inner diameter of the variable diameter exhaust pipe 4 changes. At this time, some remaining low-frequency noise is silenced again, and finally the exhaust gas is discharged through the normal diameter exhaust pipe 5. The utility model lengthens the outlet pipe of the second muffler 3 and adds a variable diameter exhaust pipe 4, thereby increasing the noise elimination capability.

[0032] Finally, although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An automobile exhaust device, comprising a catalytic converter (1), wherein a first muffler (2), a second muffler (3) and a regular diameter exhaust pipe (5) are sequentially connected to the rear of the catalytic converter (1) through an exhaust pipe, and exhaust hooks (8) are respectively provided at the front and rear ends of the first muffler (2) and the second muffler (3), wherein: The exhaust hook (8) is sleeved with an exhaust rubber ear (6), the tail of the exhaust hook (8) is provided with a threaded end (9), the threaded end (9) is provided with an exhaust limit card (7) for limiting the position of the exhaust rubber ear (6), and the exhaust limit card (7) is provided with a plurality of claw structures (701) that are threadably matched with the threaded end (9).

2. The automobile exhaust device according to claim 1, characterized in that: A variable diameter exhaust pipe (4) is provided between the exhaust pipeline of the second muffler (3) and the normal diameter exhaust pipe (5), and the maximum diameter of the variable diameter exhaust pipe (4) is 1.5 times the diameter of the normal diameter exhaust pipe (5).

3. The automobile exhaust device according to claim 2, characterized in that: The total length of the variable diameter exhaust pipe (4) is 90-110 mm, and both ends of the variable diameter exhaust pipe (4) smoothly transition to the normal diameter exhaust pipe (5) and the exhaust pipeline, with the length of the transition section being 15-20 mm.

4. The automobile exhaust device according to any one of claims 1 to 3, characterized in that: The second muffler (3) comprises an outer shell, a first core tube (302) and a second core tube (306); the front and rear ends of the outer shell are respectively sealed and fixedly connected to a cover plate 1 (309) and a cover plate 2 (308); the middle portion of the inner shell is sealed and fixedly connected to a middle partition plate (310); the two ends of the first core tube (302) respectively penetrate the cover plate 1 (309) and the middle partition plate (310); the end of the first core tube (302) close to the cover plate 1 (309) is the left end; the left end is provided with an air inlet (301); the air inlet (301) is connected to the exhaust duct at the front end of the second muffler (3); the right end of the first core tube (302) is provided with a core tube plug (304); the first core tube (302) is located on the left side of the middle partition plate (310) and has a plurality of air outlet holes (303).

5. The automobile exhaust device according to claim 4, characterized in that: The left end of the second core tube (306) passes through the middle partition plate (310), and the right end of the second core tube (306) passes through the second cover plate (308) and is connected to the exhaust pipe at the rear of the second muffler (3).

6. The automobile exhaust device according to claim 5, characterized in that: A partition plate one (305) is provided between the cover plate one (309) and the middle partition plate (310); the partition plate one (305) is sealed and fixedly connected to the inner wall of the shell; and the air inlet end of the second core tube (306) is located on the right side of the partition plate one (305).

7. The automobile exhaust device according to claim 6, characterized in that: A second partition plate (307) is provided between the middle partition plate (310) and the second cover plate (308); the second partition plate (307) is sealed and fixedly connected to the inner wall of the shell; and the second core tube (306) passes through the second partition plate (307).

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