CN201202513Y - Variable volume exhaust muffler - Google Patents

Abstract

The utility model discloses a volume-variable exhaust muffler, which comprises an intake pipe, an expansion chamber and an exhaust pipe. The expansion chamber includes a chamber wall, a front end cover and a rear end cover, and a movable partition is arranged in the expansion chamber. The expansion chamber is divided into chamber I and chamber II by moving the partition, and the chamber I and chamber II are communicated through at least one resonance hole; the air outlet of the intake pipe and the air inlet of the exhaust pipe are arranged in the chamber I, and the moving partition At least one elastic pre-tightening force device is provided, and the pre-tightening force direction of the elastic pre-tightening force device is directly facing the cavity I. The utility model can realize the self-regulation of the volume of the cavity, so that the noise reduction frequency of the muffler can increase as the engine speed increases. The engine speed decreases and the dynamic noise reduction effect of the muffler reduces the noise frequency, thereby realizing low-frequency dynamic noise reduction, which has a good low-frequency noise reduction effect and effectively eliminates exhaust noise. At the same time, through the movement of the movable partition, the attenuation and The function of reducing the exhaust pressure in the expansion chamber is simple and compact in structure.

Description

Variable volume exhaust muffler

technical field

The utility model relates to an exhaust muffler, in particular to an exhaust muffler with variable volume.

Background technique

Environmental noise refers to the sound that interferes with the surrounding life generated in industrial production, building construction, transportation and social life. Environmental noise pollution refers to the phenomenon that the generated environmental noise exceeds the environmental noise emission standards stipulated by the state and interferes with the normal life, work and study of others.

With the improvement of industrialization, the scope of noise hazards is expanding day by day. Traffic noise has become the most important noise source in the current urban environmental noise, while exhaust noise is the main noise source of automobiles and their engines. The use of mufflers is widely used to control exhaust noise. the most effective means of noise reduction. In the prior art, the muffler performance of most exhaust mufflers depends on the single-layer expansion cavity structure, and the sound waves are directly radiated from the expansion cavity wall to the outside world, which directly causes most of the noise to be directly transmitted to the outside world, causing noise pollution; and the existing The noise reduction frequency of the muffler cannot be automatically adjusted with the change of the engine working conditions, and it is always in a passive state, while the engine exhaust noise has obvious low-frequency characteristics and changes with the change of the speed.

Therefore, there is a need for an exhaust muffler, which can effectively prevent the radiation of noise sound waves to the outside, effectively eliminate or reduce exhaust noise, and reduce environmental pollution caused by noise.

Utility model content

In view of this, the purpose of this utility model is to provide a volume-variable exhaust muffler, which can effectively prevent noise sound waves from radiating to the outside world, effectively eliminate or reduce exhaust noise, reduce environmental pollution caused by noise, and has a simple and compact structure.

In order to achieve the above object, a volume-variable exhaust muffler of the present invention includes an intake pipe, an expansion chamber and an exhaust pipe. The expansion chamber includes a chamber wall, a front end cover and a rear end cover. A moving partition is provided, and the moving partition divides the expansion chamber into chamber I and chamber II, and the chamber I and chamber II are communicated through at least one resonance hole; the air outlet of the air inlet pipe and the air inlet of the exhaust pipe The mouth is arranged in the cavity I, and the movable partition is provided with at least one elastic pre-tightening force device, and the pre-tightening force direction of the elastic pre-tightening force device is facing the cavity I.

Further, the cavity wall, the front end cover and the rear end cover are respectively arranged in double layers, and there is a gap between the inner layer and the outer layer;

Further, the inner surface of the inner layer of the rear end cover is fixedly provided with sound-absorbing material;

Further, the movable partition is arranged transversely perpendicular to the cavity wall, at least one fixed partition parallel to the movable partition is arranged in the cavity 1, and at least one through hole is arranged on the fixed partition;

Further, the fixed baffles are arranged side by side in two pieces, namely the first fixed baffle and the second fixed baffle, and the air outlet of the air inlet pipe is arranged in the cavity between the second fixed baffle and the movable baffle. Inside, the air inlet of the exhaust pipe is arranged in the cavity between the first fixed partition and the front end cover;

Further, the air intake pipe passes through the front end cover, the first fixed partition and the second fixed partition in sequence; the exhaust pipe passes through the first fixed partition, the second fixed partition, the movable partition and the rear end cover in sequence; It also includes an overflow pipe, the overflow pipe passes through the first fixed partition and the second fixed partition in turn, and the two ports are respectively located in the cavity between the first fixed partition and the front end cover and the second fixed partition and the movable in the cavity between the partitions;

Further, the elastic pre-tightening force device includes a spring, a guide rod and a locking device, one end of the guide rod is fixedly arranged on the rear end cover, the other end passes through the movable partition and is provided with a locking device, and the spring is sleeved on the guide rod One end is close to the rear end cover, and the other end is close to the movable partition through the pre-tightening force; the locking device is a nut, an elastic snap ring or a pin;

Further, the air outlet of the air inlet pipe, the air inlet of the exhaust pipe and the two ports of the overflow pipe adopt the shape of a bell mouth;

Further, the resonance hole is arranged on the moving partition;

Further, the exhaust pipe passes through the chamber II, and the resonance hole is arranged on the pipe section where the exhaust pipe passes through the chamber II.

The beneficial effects of the utility model are: the volume-variable exhaust muffler of the utility model,

The double-layer structure expansion chamber is adopted, and the movable partition structure is adopted to divide the expansion chamber into two chambers, so as to realize the self-regulation of the volume of the chamber, so that it can be automatically adjusted with the change of the engine speed, and the muffler can be silenced with the increase of the engine speed. The frequency increases, the engine speed decreases, the dynamic noise reduction effect of the muffler frequency decreases, so as to achieve low-frequency dynamic noise reduction, which has a better low-frequency noise reduction effect and effectively eliminates exhaust noise. At the same time, through the movement of the movable partition, it can also The function of attenuating and reducing the exhaust pressure in the expansion cavity is realized, and the structure is simple and compact; the double-layer structure can reduce the noise radiation of the muffler passing through the shell, and reduce the noise; the sound-absorbing material can be used for medium and high-frequency sound absorption, further reducing the noise. Noise; fixed partitions are set to stabilize the internal structure of the entire muffler, and have a damping effect on the exhausted gas to further reduce noise; the air outlet of the intake pipe, the air inlet of the exhaust pipe and the two sides of the overflow pipe The port adopts a bell-shaped shape, which can reduce the generation of air regeneration noise in the muffler, and further reduce the noise to the outside world.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

Fig. 1 is a structural schematic diagram of the utility model embodiment one;

Fig. 2 is a sectional view along A-A direction of Fig. 1;

Fig. 3 is a sectional view along BB of Fig. 1;

Fig. 4 is the structural schematic diagram of the second embodiment of the utility model;

Fig. 5 is a cross-sectional view of Fig. 4 along the line CC.

Detailed ways

Embodiment one,

Figure 1 is a schematic structural view of Embodiment 1 of the utility model, Figure 2 is a sectional view along the A-A direction of Figure 1; Gas muffler, including intake pipe 1, expansion chamber 2 and exhaust pipe 3, expansion chamber 2 includes cavity wall 2c, front end cover 2a and rear end cover 2b, cavity wall 2c, front end cover 2a and rear end cover 2b are double layers Setting, there is a gap of 2mm between the inner layer and the outer layer; the inner surface of the inner layer of the rear end cover 2b is fixedly provided with sound-absorbing material 11;

The expansion cavity 2 is provided with a movable partition 4 transversely perpendicular to the cavity wall 2c, and the movable partition 4 divides the expansion cavity 2 into a cavity I 21 and a cavity II 22, and a plurality of resonance holes are passed between the cavity I 21 and the cavity II 22 5 connected, the resonance hole 5 of the present embodiment is arranged on the movable partition 4; the air outlet of the air intake pipe 1 and the air inlet of the exhaust pipe 3 are arranged in the cavity 121, and the movable partition 4 is provided with three elastic preloads Device 6, the preload direction of elastic preload device 6 is facing chamber 121; Elastic preload device 6 comprises spring 61, guide rod 62 and locking device 63, and present embodiment elastic preload device 6 is nut One end of the guide rod 62 is fixedly arranged on the rear end cover 2b, the other end passes through the movable partition 4 and a locking device 63 is set, the spring 61 is sleeved on the guide rod 62, one end is close to the rear end cover 2b, and the other end passes through the pre-set The tight force is close to the movable partition 4; the first fixed partition 7 and the second fixed partition 8 parallel to the movable partition 4 are arranged side by side in the cavity 121, and the air outlet of the air inlet pipe 1 is arranged on the second fixed partition. 8 and the cavity between the movable partition 4, the air inlet of the exhaust pipe 3 is set in the cavity between the first fixed partition 7 and the front end cover 2a, and the fixed partition is provided with a plurality of through holes 9;

The intake pipe 1 passes through the front end cover 2a, the first fixed partition 7 and the second fixed partition 8 in sequence; the exhaust pipe 3 passes through the first fixed partition 7, the second fixed partition 8, the movable partition 4 and the The rear end cover 2b; also includes an overflow pipe 10, the overflow pipe 10 passes through the first fixed partition 7 and the second fixed partition 8 in turn, and the two ports are respectively located in the cavity between the first fixed partition 7 and the front end cover 2a Inner and in the cavity between the second fixed partition 8 and the movable partition 4, the overflow pipe 10 can buffer the pressure of the high-pressure exhaust gas, so that the high-pressure gas can overflow quickly, which is beneficial to eliminate noise;

The air outlet of the intake pipe 1, the air inlet of the exhaust pipe 3, and the two ports of the overflow pipe 10 adopt the shape of a bell mouth. This structure is conducive to reducing the generation of air regeneration noise in the muffler, and further reduces the noise to the outside world.

Embodiment two

Figure 4 is a schematic structural view of Embodiment 2 of the utility model, and Figure 5 is a cross-sectional view of Figure 4 along the CC direction, as shown in the figure: the difference between this embodiment and Embodiment 1 is that the resonance hole 5 is arranged in the exhaust pipe 3 through On the pipe section of cavity II22.

Certainly, locking device 63 is not limited to nut, can also be the locking mechanism such as elastic clasp or pin; Elastic preload device 6 is not limited to three, also can be one or more; new purpose.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present utility model without limitation. Although the utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the utility model can be Modifications or equivalent replacements of the technical solutions without departing from the purpose and scope of the technical solutions of the utility model shall be covered by the claims of the utility model.

Claims (10)

1. the exhaust silencer of a variable volume, comprise suction tude (1), expansion cavity (2) and outlet pipe (3), described expansion cavity (2) comprises chamber wall (2c), front cover (2a) and rear end cover (2b), it is characterized in that: be provided with moveable partition board (4) in the described expansion cavity (2), described moveable partition board (4) is divided into chamber I (21) and chamber II (22) with expansion cavity (2), is communicated with by at least one resonance hole (5) between described chamber I (21) and the chamber II (22); The suction port of the air outlet of suction tude (1) and outlet pipe (3) is arranged in the chamber I (21), and described moveable partition board (4) is provided with at least one elasticity pretightening force device (6), and the pretightening force direction of elasticity pretightening force device (6) is over against chamber I (21).

2. the exhaust silencer of variable volume according to claim 1 is characterized in that: described chamber wall (2c), front cover (2a) and rear end cover (2b) are respectively double-deck and are provided with, and have the gap between nexine and the skin.

3. the exhaust silencer of variable volume according to claim 2, it is characterized in that: described rear end cover (2b) nexine internal surface is set with sound-absorbing material (11).

4. the exhaust silencer of variable volume according to claim 3, it is characterized in that: described moveable partition board (4) laterally is provided with perpendicular to chamber wall (2c), be provided with in the described chamber I (21) at least one with the parallel stationary barrier of moveable partition board (4), described stationary barrier is provided with at least one through hole (9).

5. the exhaust silencer of variable volume according to claim 4, it is characterized in that: described stationary barrier is two and is set up in parallel, be respectively first stationary barrier (7) and second stationary barrier (8), the air outlet of described suction tude (1) is arranged in the cavity between second stationary barrier (8) and the moveable partition board (4), and the suction port of outlet pipe (3) is arranged in the cavity between first stationary barrier (7) and the front cover (2a).

6. the exhaust silencer of variable volume according to claim 5, it is characterized in that: described suction tude (1) is passed front cover (2a), first stationary barrier (7) and second stationary barrier (8) successively; Outlet pipe (3) passes first stationary barrier (7), second stationary barrier (8), moveable partition board (4) and rear end cover (2b) successively; Also comprise discharger (10), described discharger (10) passes first stationary barrier (7) and second stationary barrier (8) successively, and two-port lays respectively in the cavity between first stationary barrier (7) and the front cover (2a) and in the cavity between second stationary barrier (8) and the moveable partition board (4).

7. the exhaust silencer of variable volume according to claim 6, it is characterized in that: described elasticity pretightening force device (6) comprises spring (61), guide rod (62) and locking device (63), described guide rod (62) one ends are fixedly installed on the rear end cover (2b), the other end passes moveable partition board (4) and locking device (63) is set, spring (61) is enclosed within on the guide rod (62), one end is near rear end cover (2b), the other end by pretightening force near moveable partition board (4); Described locking device (63) is nut, snap ring or pin.

8. the exhaust silencer of variable volume according to claim 7 is characterized in that: the suction port of the air outlet of described suction tude (1), outlet pipe (3) and the two-port of spill pipe (10) employing horn mouth shape.

9. according to the exhaust silencer of the described variable volume of the arbitrary claim of claim 1 to 8, it is characterized in that: described resonance hole (5) is arranged on the moveable partition board (4).

10. according to the exhaust silencer of the described variable volume of the arbitrary claim of claim 1 to 8, it is characterized in that: described outlet pipe (3) is by chamber II (22), and resonance hole (5) is arranged on outlet pipe (3) by on the pipeline section of chamber II (22).

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