CN114370311A

CN114370311A - Variable exhaust muffler structure of internal combustion engine

Info

Publication number: CN114370311A
Application number: CN202111506187.9A
Authority: CN
Inventors: 王德宏
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-12-10
Filing date: 2021-12-10
Publication date: 2022-04-19

Abstract

The invention discloses a variable exhaust muffler structure of an internal combustion engine, which comprises a muffler main body, wherein a silencing cavity is formed in the muffler main body in a separated mode, two ends of a silencing pipe are respectively communicated with different silencing cavities, so that the silencing cavities from the upstream to the downstream are communicated one by one, a tail pipe is arranged in the muffler main body, a regulating pipe capable of moving relatively is sleeved in the tail pipe, and openings I and II are formed in the tail pipe; the adjusting pipe is correspondingly provided with an air vent I and an air vent II; when the vent II and the opening II are plugged in a staggered manner, gas exhausted by the internal combustion engine enters the adjusting pipe from the opening I and the vent I and is exhausted to the atmosphere; when the adjusting pipe rotates and/or moves in the tail pipe to enable the vent II to coincide with the opening II, gas exhausted by the internal combustion engine enters the adjusting pipe from the opening II and the vent II and is exhausted to the atmosphere, a passage through which the gas flows is changed, different noise elimination effects are achieved, different sound effects are generated, exhaust back pressure is reduced, and therefore engine power is improved; finally, the vehicle can realize different service performances.

Description

Variable exhaust muffler structure of internal combustion engine

Technical Field

The present invention relates to an exhaust muffler structure of an internal combustion engine.

Background

High-temperature and high-pressure gas exhausted when the internal combustion engine works can be exhausted to the atmospheric environment only through the exhaust muffler; the main function of the silencer is to reduce the influence of exhaust noise on the environment and people, so that the silencer meets the requirements of national noise regulations. Because of the pressure difference of the exhaust gas, the exhaust gas of the internal combustion engine enters the muffler through the exhaust pipe, then flows through the muffler chamber and the muffler pipe in sequence according to the arrangement sequence of the muffler chamber and the muffler pipe formed by the internal structure, and finally is exhausted to the atmosphere through the tail pipe; in the flowing process of the discharged gas, the high-pressure gas passes through the silencing pipes and the silencing chambers, and the high-pressure gas is expanded, contracted, reflected and the like for multiple times, so that the energy and the noise of the high-pressure gas are continuously consumed, absorbed and attenuated, and the silencing effect is achieved. As shown in patent CN201811529829.5, the internal structure of the muffler structure is fixed, that is, the internal silencing chambers and tubes are formed and fixed by welding, and will not change during use, so the gas flowing through the muffler is sequentially expanded and diffused from the silencing tubes and chambers set up step by step to finally discharge out of the muffler, the silencing effect is constant, the exhaust back pressure value (exhaust resistance) formed by the expansion is also fixed, and the output power performance of the engine matching with the muffler will not change.

In the prior art, a silencer capable of changing an airflow path exists, but a plurality of complex electronic control systems are used, and the silencer is provided with a special throttle body, a pull wire, a circuit control system and the like, so that the arrangement occupies a large space, the structure is complex, and the cost is high.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a variable exhaust muffler structure of an internal combustion engine.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a variable exhaust silencer structure of an internal combustion engine comprises a silencer main body, wherein an inner cavity of the silencer main body is divided into two or more silencing cavities by a cavity partition plate, silencing pipes are supported on the cavity partition plate, two ends of each silencing pipe are respectively communicated with different silencing cavities, so that the silencing cavities from the upstream to the downstream are communicated one by one, a tail pipe is arranged in the silencer main body, an adjusting pipe is sleeved in the tail pipe and can rotate and/or move relative to the tail pipe, an opening I and an opening II are arranged on the tail pipe, the opening I is positioned in the silencing cavity at the tail end of the downstream, and the opening II is positioned in other silencing cavities; the adjusting pipe is provided with an air vent I corresponding to the opening I and an air vent II corresponding to the opening II; when the vent II is staggered with the opening II, the opening II is blocked, and gas exhausted by the internal combustion engine flows through all the silencing cavities upstream to the downstream and then enters the regulating pipe from the opening I and the vent I to be exhausted to the atmosphere; when the adjusting pipe rotates and/or moves in the tail pipe, the vent hole II is overlapped with the opening II, and gas exhausted by the internal combustion engine enters the adjusting pipe from the opening II and the vent hole II and is exhausted to the atmosphere.

The cross sections of the adjusting pipe and the tail pipe are circular, the adjusting pipe can rotate relative to the tail pipe, and the air vent II and the opening II are staggered or overlapped by changing the angle.

The silencer main body forms three silencing cavities through two cavity clapboards, A, B, C are formed from upstream to downstream in sequence, and the silencing cavity C is clamped between the silencing cavities A, B; the silencing cavity A is communicated with a silencing cavity B through a silencing pipe I, the silencing cavity B is communicated with a silencing cavity C through a silencing pipe II, and the tail pipe stretches across the silencing cavity A, C, B.

And the tail pipe positioned in the silencing cavity A is provided with an opening II, and the tail pipe positioned in the silencing cavity C is provided with an opening I.

The air vent I is formed by a whole circle of meshes annularly distributed on the adjusting pipe and is always communicated with the opening I.

And the air vents I and the air vents II are arranged on the adjusting pipe according to angle dislocation.

And the opening area of the vent II is smaller than that of the opening II.

The invention has the beneficial effects that: when the vent II of the regulating pipe is staggered with the opening II of the tail pipe, the opening II is blocked, and at the moment, gas exhausted by the internal combustion engine flows through all the silencing cavities upstream to downstream and then enters the regulating pipe in the tail pipe from the opening I and the vent I to be exhausted to the atmosphere, so that the silencing effect is optimal; when the opening II is coincided with the vent II by rotating and/or moving the adjusting pipe, the passage through which the airflow flows is changed, and the air enters the adjusting pipe through the opening II and the vent II in the silencing cavity before the downstream tail end silencing cavity and is discharged to the atmosphere, so that different silencing effects are realized, namely different sound quality effects are generated, and the requirements of different users are met; meanwhile, the exhaust back pressure can be reduced, so that the exhaust is smoother, and the power of the engine is improved; the invention has simple structure, easy realization and low cost, can realize different exhaust sound effects and power performances under different environments or working conditions, and brings more pleasant riding feeling to riders.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic diagram of the operation of the present invention;

FIG. 2 is a working schematic diagram of the present invention under urban road conditions;

FIG. 3 is a schematic view of the regulator tube of FIG. 2 shown disassembled from the tailpipe;

FIG. 4 is a schematic diagram of the operation of the present invention in a suburban or off-road condition;

FIG. 5 is a schematic view of the regulator tube of FIG. 4 shown disassembled from the tailpipe;

FIGS. 6 and 7 are schematic diagrams illustrating the operation of another embodiment of the present invention;

FIG. 8 is a schematic view of another embodiment of the present invention showing the conditioning pipe detached from the liner.

Detailed Description

Referring to fig. 1 to 5, the variable exhaust muffler structure of an internal combustion engine comprises a muffler body 1, wherein an inner cavity of the muffler body 1 is divided into three muffling chambers by two chamber clapboards 7, the three muffling chambers are A, B, C from upstream to downstream, wherein the muffling chamber C is clamped between the muffling chambers A, B, the muffling chamber a is communicated with the muffling chamber B through a muffling pipe i 8, the muffling chamber B is communicated with the muffling chamber C through a muffling pipe ii 9, and a tail pipe 2 stretches across the muffling chamber A, C, B. The tail pipe 2 is internally sleeved with an adjusting pipe 3, the cross sections of the adjusting pipe 3 and the tail pipe 2 are circular, and the adjusting pipe 3 can rotate relative to the tail pipe 2; be equipped with opening I6 and opening II 4 on the tail pipe 2, opening I6 is located the terminal amortization chamber of low reaches, and be amortization chamber C promptly, opening II 4 is located other amortization intracavity, for example amortization chamber A, amortization chamber B, and opening II 4 is located amortization chamber A in this embodiment. A vent I10 is arranged on the adjusting pipe 3 corresponding to the opening I6, and a vent II 5 is arranged corresponding to the opening II 4; when the vent II 5 is staggered with the opening II 4, the opening II 4 is blocked, and gas exhausted by the internal combustion engine flows through the upstream silencing cavity A, B, C to the downstream, then enters the adjusting pipe 3 from the opening I6 and the vent I10 and is exhausted to the atmosphere; when the adjusting pipe 3 rotates in the tail pipe 2, the vent II 5 and the opening II 4 are overlapped by changing the angle, gas discharged by the internal combustion engine enters the adjusting pipe 3 from the opening II 4 and the vent II 5 in the silencing cavity A and is discharged to the atmosphere, the communicating relation between the tail pipe 2 and the silencing cavity is changed through the adjusting pipe 3, the passage through which the gas flows is changed, and then different silencing effects are realized.

Specifically, when the vent II 5 and the opening II 4 are staggered, the opening II 4 is blocked, the adjusting pipe 3 is communicated with the silencing cavity C through the vent I10 and the opening I6 for exhausting, high-pressure gas exhausted by the internal combustion engine 4 enters the silencing cavity A, the high-pressure gas is communicated to the silencing cavity B through the silencing pipe I8 under the drive of air pressure difference, then communicated to the silencing cavity C through the silencing pipe II 9, and passes through each silencing pipe and the silencing cavity, the high-pressure gas is subjected to interference, expansion, contraction, reflection and the like for multiple times, energy and noise of the high-pressure gas are continuously consumed, absorbed and attenuated, and finally enters the adjusting pipe 3 through the opening I6 and the vent I10 and is exhausted to the atmosphere, and the noise of the exhausted gas is reduced to meet the noise regulation requirements of national related urban roads, so that the vehicle adopts a relatively quiet exhaust silencing effect in the urban roads. However, when the vehicle runs in a suburb or off-road environment, the adjusting pipe 3 can be controlled to rotate in the tail pipe 2 to enable the air vent II 5 and the opening II 4 to coincide, the adjusting pipe 3 is communicated with the sound attenuation cavity A through the air vent II 5 and the opening II 4 to exhaust, at the moment, the air flow in the silencer is shortest in passage, under the condition that the air flow does not pass through a subsequent sound attenuation structure, the exhaust sound is rough and strong, the exhaust back pressure is reduced, the exhaust is smoother, the engine power is improved, and more pleasant suburb driving feeling is brought to driving and riding.

The invention has simple structure, easy realization and low cost, can realize different exhaust sound effects and power performances under different environments or working conditions, meets the requirements of different users and brings more pleasant riding experience to drivers and passengers.

Besides the rotation mode of the adjusting pipe 3 relative to the tail pipe 2 in the embodiment, the adjusting pipe 3 and the tail pipe 2 can realize the dislocation or coincidence of the air vent II 5 and the opening II 4 by moving or rotating and moving modes so as to change the passage through which the air flow in the silencer flows, thereby realizing different silencing effects.

Preferably, the vent I10 is formed by a whole circle of meshes which are annularly distributed on the adjusting pipe 3, and is always communicated with the silencing cavity C through the opening I6, when gas in the silencing cavity A enters the adjusting pipe 3 from the opening II 4 and the vent II 5 and is discharged to the atmosphere, the gas can flow through the vent I10, and the vent I10 is matched with the silencing cavity C to generate a resonance effect, so that noise with specific frequency is eliminated, and exhaust sound is cleaner and thicker.

In another embodiment shown in fig. 6 to 8, the vent i 10 and the vent ii 5 are arranged on the adjusting tube 3 according to an angle dislocation arrangement, and the vent i 10 and the opening i 6 or the opening ii 4 and the vent ii 5 can be selectively communicated by rotating the adjusting tube 3, so that the switching of the air flow passage is realized, and further, different noise reduction effects are realized.

Preferably, the opening area of the vent II 5 is smaller than that of the opening II 4, so that the vent II 5 can be easily rotated away from the covering area of the opening II 4 to close the opening II 4.

The above embodiments are only preferred embodiments of the present invention, and should not be used to limit the scope of the present invention, and persons skilled in the art should also realize the technical objects and technical effects of the present invention by using basically the same technical means without departing from the principle of the present invention.

Claims

1. The variable exhaust muffler structure of the internal combustion engine comprises a muffler main body (1), wherein the inner cavity of the muffler main body (1) is divided into two or more silencing cavities by a cavity partition plate (7), silencing pipes are supported on the cavity partition plate, two ends of each silencing pipe are respectively communicated with different silencing cavities, so that the silencing cavities from the upstream to the downstream are communicated one by one, and the variable exhaust muffler structure is characterized in that: a tail pipe (2) is arranged in the silencer main body (1), an adjusting pipe (3) is sleeved in the tail pipe (2), the adjusting pipe (3) can rotate and/or move relative to the tail pipe (2), an opening I (6) and an opening II (4) are arranged on the tail pipe (2), the opening I (6) is located in a silencing cavity at the tail end of the downstream, and the opening II (4) is located in other silencing cavities; an air vent I (10) is arranged on the adjusting pipe (3) corresponding to the opening I (6), and an air vent II (5) is arranged corresponding to the opening II (4); when the vent II (5) is staggered with the opening II (4), the opening II (4) is blocked, and gas exhausted by the internal combustion engine flows through all the muffling cavities upstream to downstream and then enters the adjusting pipe (3) from the opening I (6) and the vent I (10) to be exhausted to the atmosphere; when the adjusting pipe (3) rotates and/or moves in the tail pipe (2) to enable the vent hole II (5) to coincide with the opening II (4), gas exhausted by the internal combustion engine enters the adjusting pipe (3) from the opening II (4) and the vent hole II (5) and is exhausted to the atmosphere.

2. The variable exhaust muffler structure according to claim 1, wherein: the cross sections of the adjusting pipe (3) and the tail pipe (2) are circular, the adjusting pipe (3) can rotate relative to the tail pipe (2), and the air vent (5) II and the opening II (4) are staggered or overlapped by changing the angle.

3. The variable exhaust muffler structure according to claim 1, wherein: the silencer main body (1) forms three silencing cavities through two cavity partition plates (7), A, B, C are formed from upstream to downstream in sequence, and the silencing cavity C is clamped between the silencing cavities A, B; the silencing cavity A is communicated with a silencing cavity B through a silencing pipe I (8), the silencing cavity B is communicated with a silencing cavity C through a silencing pipe II (9), and the tail pipe (2) stretches across the silencing cavity A, C, B.

4. The variable exhaust muffler structure according to claim 3, wherein: an opening II (4) is arranged on the tail pipe (2) positioned in the silencing cavity A, and an opening I (6) is arranged on the tail pipe (2) positioned in the silencing cavity C.

5. The variable exhaust muffler structure according to claim 2, wherein: the air vent I (10) is formed by a whole circle of meshes annularly distributed on the adjusting pipe (3) and is always communicated with the opening I (6).

6. The variable exhaust muffler structure according to claim 2, wherein: the air vents I (10) and the air vents II (5) are arranged on the adjusting pipe (3) according to angle dislocation.

7. The variable exhaust muffler structure according to any one of claims 1 to 6, wherein: and the opening area of the vent II (5) is smaller than that of the opening II (4).