Double-catalyst special-shaped silencer
By designing an independent catalyst sleeve and oxygen sensor connection, combined with a double-layer glass fiber layer structure to optimize the inner cavity, the problem of difficult design and assembly of motorcycle mufflers under a dual-catalyst structure is solved, the effects of exhaust gas purification and noise reduction are achieved, and stable purification monitoring and sound insulation and heat insulation performance are provided.
Patent Information
- Application Number
- CN202422244337.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-09-12
AI Technical Summary
Existing motorcycle mufflers using a dual-catalyst structure are difficult to design and assemble, making it difficult to meet regulatory emission requirements and unable to effectively purify exhaust gas and reduce noise.
A dual-catalyst special-shaped muffler was designed, which uses independent rear catalyst sleeves and front catalyst sleeves, connected by welding to form a muffler. Oxygen sensors are installed on the exhaust pipe and catalyst sleeves. Combined with a double-layer glass fiber layer structure and an optimized inner cavity structure, smooth gas flow and purification effect are achieved.
A dual-catalyst muffler with a simple structure and easy assembly has been realized, which can effectively purify exhaust gas, reduce noise, and monitor the purification effect through an oxygen sensor, providing better sound insulation and heat insulation performance.
Smart Images
Figure CN223359199U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of mufflers and relates to a double-catalyst special-shaped muffler. Background Art
[0002] A motorcycle muffler is a device used to treat motorcycle engine exhaust emissions, reducing engine noise and environmental pollution. The exhaust muffler consists of an exhaust pipe and a muffler connected together, with a catalyst installed inside the pipe or muffler. The catalyst is a cylindrical structure with a honeycomb shape in the middle, which purifies engine exhaust.
[0003] Due to the increasing emission requirements, some motorcycle mufflers have begun to use a dual-catalyst structure. However, the dual-catalyst structure has brought difficulties to the design and assembly of the muffler. In view of this, it is necessary to develop a dual-catalyst muffler with a simple structure, easy assembly, and meeting the emission requirements of the regulations. Utility Model Content
[0004] In view of the deficiencies in the prior art, the utility model provides a double-catalyst special-shaped muffler, which has a simple structure and is easy to assemble, and can effectively purify exhaust gas and reduce noise.
[0005] In order to solve the above technical problems, the purpose of the utility model is achieved through the following technical solutions:
[0006] A dual-catalyst special-shaped muffler includes a muffler cylinder formed by a cylinder assembly, a front cover assembly and a rear cover assembly, the outer side of the cylinder assembly is provided with a rear catalyst sleeve, a front catalyst sleeve and an exhaust pipe connected in sequence, the rear end of the rear catalyst sleeve is connected to the front cover assembly and communicates with the inner cavity of the muffler cylinder, the front end of the exhaust pipe is connected to the engine exhaust port, a rear catalyst is provided in the rear catalyst sleeve, and a front catalyst is provided in the front catalyst sleeve, a rear oxygen sensor located on the rear side of the rear catalyst is provided on the rear catalyst sleeve, and a front oxygen sensor is provided on the exhaust pipe.
[0007] In the above-mentioned dual-catalyst special-shaped muffler, a catalyst joint is provided at the front end of the rear catalyst sleeve, a front connecting piece is provided at the front end of the front catalyst sleeve, and a rear connecting piece is provided at the rear end. The catalyst joint is fixedly connected to the rear connecting piece, and the front connecting piece is fixedly connected to the rear end of the exhaust pipe.
[0008] In the above-mentioned dual-catalyst special-shaped muffler, the catalyst joint, front connecting piece and rear connecting piece are all tapered structures with reduced diameter; preferably, the minimum radial dimensions of the catalyst joint, front connecting piece and rear connecting piece are all equivalent to the radial dimensions of the exhaust pipe.
[0009] In the above-mentioned dual-catalyst special-shaped muffler, the rear catalyst sleeve and the front cover assembly, the catalyst joint and the rear connecting piece, and the front connecting piece and the exhaust pipe are all fixed by welding.
[0010] In the above-mentioned dual-catalyst special-shaped muffler, a penetrating rear oxygen sensor connector is provided on the outer wall of the rear catalyst sleeve, and the rear oxygen sensor is installed in the rear oxygen sensor connector; a penetrating front oxygen sensor connector is provided on the outer wall of the exhaust pipe, and the front oxygen sensor is installed in the front oxygen sensor connector; preferably, the rear oxygen sensor connector and the front oxygen sensor connector are both arranged upward.
[0011] In the above-mentioned dual-catalyst special-shaped muffler, the cylinder assembly includes an inner cylinder, an outer cylinder and a first glass fiber layer sandwiched between the two; the front cover assembly includes a front inner cover, a front outer cover and a second glass fiber layer sandwiched between the two; the rear cover assembly includes a rear inner cover, a rear outer cover and a third glass fiber layer sandwiched between the two; further, the cylinder assembly is connected to the front cover assembly through a front support ring, and is connected to the rear cover assembly through a rear support ring.
[0012] In the above-mentioned dual-catalyst special-shaped muffler, a front baffle and a rear baffle are provided in the cylinder assembly, and the front baffle and the rear baffle divide the inner cavity of the muffler cylinder into a front cavity, an intermediate cavity and a rear cavity. The front cavity and the intermediate cavity are connected through a number of air vents provided on the front baffle, the front cavity and the rear cavity are connected through a first inner tube, the rear cavity and the intermediate cavity are connected through a pair of second inner tubes, and the intermediate cavity is connected to the outside through a tail pipe; further, a first inner tube mounting hole is provided on the front baffle and the rear baffle, a second inner tube mounting hole is provided on the rear baffle, and a tail pipe mounting hole is provided on the rear baffle and the rear cover assembly.
[0013] In the above-mentioned dual-catalyst special-shaped muffler, an upper hanging plate is provided above the cylinder assembly and a first lower hanging plate is provided below the cylinder assembly, a second lower hanging plate is provided below the rear catalyst sleeve, the upper hanging plate is located between the first lower hanging plate and the second lower hanging plate, and the upper hanging plate, the first lower hanging plate and the second lower hanging plate are respectively provided with hanging plate rings.
[0014] Compared with the prior art, the present invention has the following beneficial effects:
[0015] 1. The present invention provides a dual-catalyst special-shaped muffler, which uses an independent rear catalyst sleeve to set the rear catalyst, and an independent front catalyst sleeve to set the front catalyst. They are connected in sequence by welding to form a dual-catalyst muffler, thereby achieving a more excellent exhaust gas purification effect. The dual-catalyst structure of the present invention does not affect the structure and muffler effect of the original muffler cylinder. At the same time, it is convenient to produce a small-section structure first and then assemble it. Therefore, it has the advantages of simple structure and easy assembly. The present invention can better monitor the purification effect and status of the catalyst by setting a front oxygen sensor in the exhaust pipe and a rear oxygen sensor in the rear catalyst sleeve.
[0016] 2. The utility model further adopts a double-layer structure, which sequentially arranges a cylinder assembly consisting of an inner cylinder, an outer cylinder and a first glass fiber layer, a front cover assembly consisting of a front inner cover, a front outer cover and a second glass fiber layer, and a rear cover assembly consisting of a rear inner cover, a rear outer cover and a third glass fiber layer, which can achieve better sound insulation and heat insulation effects.
[0017] 3. The utility model further optimizes the structure of the muffler inner cavity, and the combination of the vent hole, the first inner tube and the double second inner tubes can make the gas flow smoother. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is the main view of the utility model;
[0019] Figure 2 It is a cross-sectional view of the cylinder of the muffler of the utility model;
[0020] Figure 3 This is a cross-sectional view of the rear catalyst sleeve of the utility model;
[0021] Figure 4 This is a cross-sectional view of the front catalyst sleeve of the utility model;
[0022] Figure 5 It is a cross-sectional view of the front partition of the utility model;
[0023] Figure 6 It is a cross-sectional view of the rear partition of the utility model;
[0024] Figure numerals: 1, cylinder assembly; 2, front cover assembly; 3, rear cover assembly; 4, rear catalyst sleeve; 5, front catalyst sleeve; 6, exhaust pipe; 7, rear catalyst; 8, front catalyst; 9, catalyst connector; 10, front connecting piece; 11, rear connecting piece; 12, rear oxygen sensor connector; 13, front oxygen sensor connector; 14, inner cylinder; 15, outer cylinder; 16, first glass fiber layer; 17, front inner cover; 18 , front outer cover; 19, second glass fiber layer; 20, rear inner cover; 21, rear outer cover; 22, third glass fiber layer; 23, front partition; 24, rear partition; 25, front cavity; 26, middle cavity; 27, rear cavity; 28, vent; 29, first inner tube; 30, second inner tube; 31, tail pipe; 32, upper hanging plate; 33, first lower hanging plate; 34, second lower hanging plate; 35, hanging plate ring. DETAILED DESCRIPTION
[0025] The present invention will be further described below with reference to specific embodiments of the present invention. Figure 1-6 :
[0026] A dual-catalyst special-shaped muffler includes a muffler cylinder formed by a cylinder assembly 1, a front cover assembly 2 and a rear cover assembly 3. The outer side of the cylinder assembly 1 is provided with a rear catalyst sleeve 4, a front catalyst sleeve 5 and an exhaust pipe 6 connected in sequence. The rear end of the rear catalyst sleeve 4 is connected to the front cover assembly 2 and communicates with the inner cavity of the muffler cylinder. The front end of the exhaust pipe 6 is connected to the engine exhaust port. A rear catalyst 7 is provided in the rear catalyst sleeve 4, and a front catalyst 8 is provided in the front catalyst sleeve 5. A rear oxygen sensor located on the rear side of the rear catalyst 7 is provided on the rear catalyst sleeve 4, and a front oxygen sensor is provided on the exhaust pipe 6.
[0027] The exhaust gas generated by the engine is discharged from its exhaust port and enters the exhaust pipe 6. The exhaust gas is detected by the front oxygen sensor and then enters the front catalyst sleeve 5. The front catalyst 8 in the front catalyst sleeve 5 purifies the exhaust gas for the first time. The exhaust gas after the first purification enters the rear catalyst sleeve 4. The rear catalyst 7 in the rear catalyst sleeve 4 purifies the exhaust gas for the second time. The exhaust gas after two purifications is detected by the rear oxygen sensor and enters the inner cavity of the muffler cylinder. It is then discharged after being silenced by the silencer structure in the inner cavity of the muffler cylinder.
[0028] Compare with Figures 1 to 4 The specific assembly structure of this embodiment is: the front end of the rear catalyst sleeve 4 is provided with a catalyst joint 9, the front end of the front catalyst sleeve 5 is provided with a front connecting piece 10, and the rear end is provided with a rear connecting piece 11, the catalyst joint 9 is fixedly connected to the rear connecting piece 11, and the front connecting piece 10 is fixedly connected to the rear end of the exhaust pipe 6.
[0029] Preferably, in order to make the gas flow smoother and facilitate connection and assembly, the catalytic joint 9, the front connecting piece 10 and the rear connecting piece 11 are all tapered structures with reduced diameter; preferably, the minimum radial dimensions of the catalytic joint 9, the front connecting piece 10 and the rear connecting piece 11 are all equivalent to the radial dimensions of the exhaust pipe 6.
[0030] Preferably, the rear catalyst sleeve 4 and the front cover assembly 2, the catalyst joint 9 and the rear connecting piece 11, and the front connecting piece 10 and the exhaust pipe 6 are all fixed by welding.
[0031] In order to facilitate the assembly of the rear oxygen sensor and the front oxygen sensor, a penetrating rear oxygen sensor connector 12 is provided on the outer wall of the rear catalyst sleeve 4, and the rear oxygen sensor is installed in the rear oxygen sensor connector 12; a penetrating front oxygen sensor connector 13 is provided on the outer wall of the exhaust pipe 6, and the front oxygen sensor is installed in the front oxygen sensor connector 13; preferably, the rear oxygen sensor connector 12 and the front oxygen sensor connector 13 are both arranged upward.
[0032] Compare with Figure 2 In this embodiment, the muffler cylinder is formed by a double-layer structure with a glass fiber layer, which can achieve better heat insulation and sound insulation effects. Specifically: the cylinder assembly 1 includes an inner cylinder 14, an outer cylinder 15 and a first glass fiber layer 16 sandwiched between the two; the front cover assembly 2 includes a front inner cover 17, a front outer cover 18 and a second glass fiber layer 19 sandwiched between the two; the rear cover assembly 3 includes a rear inner cover 20, a rear outer cover 21 and a third glass fiber layer 22 sandwiched between the two; further, the cylinder assembly 1 is connected to the front cover assembly 2 through a front support ring, and is connected to the rear cover assembly 3 through a rear support ring.
[0033] Compare with Figure 2 , Attachment Figure 5 and attached Figure 6The silencer structure of this embodiment is as follows: a front baffle 23 and a rear baffle 24 are provided in the cylinder assembly 1, and the front baffle 23 and the rear baffle 24 divide the inner cavity of the muffler cylinder into a front cavity 25, an intermediate cavity 26 and a rear cavity 27. The front cavity 25 and the intermediate cavity 26 are connected through a number of vents 28 provided on the front baffle 23, the front cavity 25 and the rear cavity 27 are connected through a first inner tube 29, the rear cavity 27 and the intermediate cavity 26 are connected through a pair of second inner tubes 30, and the intermediate cavity 26 is connected to the outside through a tail pipe 31; further, a first inner tube 29 mounting hole is provided on the front baffle 23 and the rear baffle 24, a second inner tube 30 mounting hole is provided on the rear baffle 24, and a tail pipe 31 mounting hole is provided on the rear baffle 24 and the rear cover assembly 3. The flow of gas through the above-mentioned silencer structure gradually attenuates the noise, thereby achieving the effect of silencer. In addition, when idling, the exhaust volume is low, and the gas flow path of the inner tube is relatively tortuous, and the gas can be exhausted smoothly through the vent hole 28 on the front partition 23 that is directly connected to the cavity. When running at high speed, the exhaust is exhausted simultaneously through the vent hole 28 and the larger inner tube, which can achieve a better silencer effect.
[0034] Compare with Figure 1 The specific installation structure of this embodiment is: an upper hanging plate 32 is provided above the cylinder assembly 1, and a first lower hanging plate 33 is provided below the cylinder assembly 1; a second lower hanging plate 34 is provided below the rear catalyst sleeve 4; the upper hanging plate 32 is located between the first lower hanging plate 33 and the second lower hanging plate 34; the upper hanging plate 32, the first lower hanging plate 33 and the second lower hanging plate 34 are respectively provided with hanging plate rings 35; by simultaneously hanging the cylinder assembly 1 and the rear catalyst sleeve 4 on multiple hanging plates, a more stable structure can be obtained.
[0035] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.
Claims
1. A dual-catalyst special-shaped muffler, comprising a muffler cylinder formed by a cylinder assembly (1), a front cover assembly (2) and a rear cover assembly (3), characterized in that: The outer side of the cylinder assembly (1) is provided with a rear catalyst sleeve (4), a front catalyst sleeve (5) and an exhaust pipe (6) which are connected in sequence. The rear end of the rear catalyst sleeve (4) is connected to the front cover assembly (2) and communicates with the inner cavity of the muffler cylinder. The front end of the exhaust pipe (6) is connected to the engine exhaust port. The rear catalyst sleeve (4) is provided with a rear catalyst (7), and the front catalyst sleeve (5) is provided with a front catalyst (8). The rear catalyst sleeve (4) is provided with a rear oxygen sensor located on the rear side of the rear catalyst (7), and the exhaust pipe (6) is provided with a front oxygen sensor.
2. A dual-catalyst special-shaped muffler according to claim 1, characterized in that: The front end of the rear catalyst sleeve (4) is provided with a catalyst joint (9), the front end of the front catalyst sleeve (5) is provided with a front connecting piece (10), and the rear end is provided with a rear connecting piece (11), the catalyst joint (9) is fixedly connected to the rear connecting piece (11), and the front connecting piece (10) is fixedly connected to the rear end of the exhaust pipe (6).
3. A dual-catalyst special-shaped muffler according to claim 2, characterized in that: The catalyst joint (9), the front connecting piece (10) and the rear connecting piece (11) are all tapered structures with reduced diameters.
4. A dual-catalyst special-shaped muffler according to claim 2, characterized in that: The rear catalyst sleeve (4) and the front cover assembly (2), the catalyst joint (9) and the rear connecting piece (11), and the front connecting piece (10) and the exhaust pipe (6) are all fixed by welding.
5. The dual-catalyst special-shaped muffler according to claim 1, characterized in that: A penetrating rear oxygen sensor connector (12) is provided on the outer wall of the rear catalyst sleeve (4), and the rear oxygen sensor is installed in the rear oxygen sensor connector (12); a penetrating front oxygen sensor connector (13) is provided on the outer wall of the exhaust pipe (6), and the front oxygen sensor is installed in the front oxygen sensor connector (13).
6. The dual-catalyst special-shaped muffler according to claim 1, characterized in that: The cylinder assembly (1) comprises an inner cylinder (14), an outer cylinder (15) and a first glass fiber layer (16) sandwiched between the inner cylinder and the outer cylinder; the front cover assembly (2) comprises a front inner cover (17), a front outer cover (18) and a second glass fiber layer (19) sandwiched between the inner cylinder and the outer cylinder; and the rear cover assembly (3) comprises a rear inner cover (20), a rear outer cover (21) and a third glass fiber layer (22) sandwiched between the inner cylinder and the outer cylinder.
7. The dual-catalyst special-shaped muffler according to claim 1, characterized in that: A front baffle (23) and a rear baffle (24) are provided in the cylinder assembly (1), and the front baffle (23) and the rear baffle (24) divide the inner cavity of the muffler cylinder into a front cavity (25), an intermediate cavity (26) and a rear cavity (27). The front cavity (25) and the intermediate cavity (26) are connected through a plurality of vents (28) provided on the front baffle (23), the front cavity (25) and the rear cavity (27) are connected through a first inner tube (29), the rear cavity (27) and the intermediate cavity (26) are connected through a pair of second inner tubes (30), and the intermediate cavity (26) is connected to the outside through a tail pipe (31).
8. The dual-catalyst special-shaped muffler according to claim 1, characterized in that: An upper hanging plate (32) is provided above the cylinder assembly (1), and a first lower hanging plate (33) is provided below the cylinder assembly (1); a second lower hanging plate (34) is provided below the rear catalyst sleeve (4); the upper hanging plate (32) is located between the first lower hanging plate (33) and the second lower hanging plate (34); and hanging plate rings (35) are respectively provided on the upper hanging plate (32), the first lower hanging plate (33) and the second lower hanging plate (34).