Silencer

Abstract

The utility model relates to the field of silencers, and discloses a silencer which comprises a shell, an air inlet pipe and an exhaust pipe, the air inlet pipe and the exhaust pipe are arranged on the shell, and the air inlet pipe and / or the exhaust pipe are / is connected with a silencing assembly located in the shell. The noise reduction assembly comprises a noise reduction cover connected with the air inlet pipe and / or the exhaust pipe and a noise reduction body connected with the noise reduction cover. The silencing body is used for silencing noise in the silencing cover based on a Helmholtz resonance principle; and the noise reduction cover is used for reducing noise based on an expansion noise reduction principle. The silencer can improve the silencing effect.

Description

TECHNICAL FIELD

[0001] The utility model relates to the muffler field especially relates to a muffler. BACKGROUND

[0002] At present, along with the gradual growth of domestic railway development infrastructure, the railway locomotive possession quantity rises, aiming at large supercharged diesel engine, exhaust noise is serious, and the muffler as the muffling component of railway locomotive has important role, and the existing diesel engine muffler generally is through the shell is divided into multiple chambers, and each chamber adopts single expansion muffling or resonance muffling, makes the noise that discharges passes through multiple chambers in turn and is muffled, but, through this mode, the overall structure of the muffler is larger, or the muffling effect is poorer.

[0003] CN203547839U discloses diesel engine multi-chamber muffler, including muffler cylinder, intake pipe, exhaust pipe, the both ends of muffler cylinder are equipped with front end cover and rear end cover, its characterized in be that: the inside of muffler cylinder is provided with front baffle, middle baffle and rear baffle parallel to front end cover, front end cover and front baffle, front baffle and middle baffle, middle baffle and rear baffle, rear baffle and rear end cover form first chamber, second chamber, third chamber, fourth chamber respectively, the cylinder section of muffler cylinder is opened with intake port in first chamber, the intake pipe is communicated with intake port and extends into first chamber, the first core pipe and second core pipe that are parallel to each other are equipped in second chamber, one end of first core pipe passes through front baffle and is communicated with first chamber, the other end passes through middle baffle and is communicated with third chamber, one end of second core pipe passes through front baffle and is communicated with first chamber, the other end passes through middle baffle and is communicated with third chamber, the first core pipe, second core pipe are opened with expansion hole on the pipe section of second chamber, one end of exhaust pipe passes through rear baffle and is communicated with third chamber, the other end passes through rear end cover and is communicated with atmosphere, the rear baffle is also opened with air hole.This muffler is mainly utilized resonance muffling principle to carry out the noise reduction of exhaust noise, and depends on a kind of noise reduction mode to carry out muffling, possibly for the noise reduction ability of some frequency band is weak, influence overall muffling effect.

[0004] The utility model needs to solve the technical problem of how to improve the muffling effect of muffler. UTILITY MODEL CONTENTS

[0005] The utility model discloses a kind of mufflers, intake pipe and exhaust pipe are connected with muffling assembly, so that exhaust noise is entered into shell, through the expansion muffling of muffling cover and the resonance muffling of muffling body, improve the muffling effect of muffler.

[0006] To achieve the above object, the technical scheme adopted by the present application is as follows:

[0007] The muffler comprises a shell, an air inlet pipe and an air outlet pipe arranged on the shell, and a muffling assembly arranged in the shell and connected with the air inlet pipe and / or the air outlet pipe; the muffling assembly comprises a muffling cover connected with the air inlet pipe and / or the air outlet pipe and a muffling body connected with the muffling cover; the muffling body muffles the noise in the muffling cover based on the Helmholtz resonance principle; and the muffling cover muffles the noise based on the expansion muffling principle.

[0008] Preferably, at least two partitions are arranged in the shell, and the partitions divide the shell into at least two first chambers and at least one second chamber for resonance muffling of the exhaust noise, and two adjacent first chambers are communicated through the second chamber; the muffling assembly is arranged in the first chamber; and the muffling cover encloses a muffling cavity in the first chamber.

[0009] Preferably, the number of the partitions is two, and the partitions divide the shell into two first chambers and one second chamber; a muffling pipe assembly is arranged in the second chamber; and the second chamber is communicated with two muffling cavities through the muffling pipe assembly.

[0010] Preferably, a first through hole is arranged on the muffling cover; and the first chamber is filled with first sound-absorbing cotton between the muffling cover.

[0011] Preferably, the muffling pipe assembly comprises a plurality of muffling pipes; the muffling pipes are composed of a first sound-absorbing layer, a second sound-absorbing layer and a sealing layer from inside to outside; the first sound-absorbing layer is provided with a second through hole; the second sound-absorbing layer is provided with a third through hole; and the diameter of the second through hole is greater than that of the third through hole.

[0012] Preferably, a plurality of the muffling pipes are arranged in a circumferential array in the second chamber; and two ends of the plurality of muffling pipes are communicated with the muffling cavities arranged at two ends of the shell, respectively.

[0013] Preferably, the second chamber is filled with second sound-absorbing cotton between the muffling pipes; a fourth through hole is arranged on the partition close to the air inlet pipe; and the fourth through hole is used for moving the exhaust noise of the muffling cavities to the second sound-absorbing cotton.

[0014] Preferably, the muffling body is composed of a thin pipe and a cavity; one end of the thin pipe is communicated with the cavity, and the other end of the thin pipe is communicated with the muffling cavity.

[0015] Preferably, an isolation net for preventing foreign matters from entering is arranged at the end of the air outlet pipe.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] The muffler, the air inlet pipe and the air outlet pipe are connected with the sound absorbing assembly. When the exhaust noise enters the shell from the air inlet pipe, the exhaust noise enters the sound absorbing cover to expand and absorb sound. Part of the noise enters the sound absorbing body to resonate and absorb sound. The two sound absorbing methods in one chamber improve the sound absorbing effect.

[0018] Secondly, the shell is divided into a first chamber and a second chamber. The sound absorbing assembly is arranged in the first chamber. The exhaust noise is first subjected to the sound absorbing effect of the sound absorbing assembly in the first chamber, then subjected to the resonance sound absorbing effect of the sound absorbing pipe assembly in the second chamber, and finally discharged from the air outlet pipe.

[0019] In this way, the two sound absorbing methods are realized in one chamber, the sound absorbing effect is improved, and the structure size is prevented from being increased due to the adoption of multiple sound absorbing methods by the combination of the sound absorbing body and the sound absorbing chamber. Secondly, the exhaust noise of different frequencies is subjected to sound absorbing treatment by the multiple chambers and the multiple sound absorbing principles, and the sound absorbing effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structure schematic view of the muffler of the embodiment 1.

[0021] Figure 2 It is a structure schematic view of the muffler of the embodiment 1 (part of the shell is removed).

[0022] Figure 3 It is a half sectional view of the muffler of the embodiment 1.

[0023] Figure 4 It is a sectional view of the sound absorbing body of the embodiment 1.

[0024] Figure 5 It is a sectional view of the sound absorbing pipe of the embodiment 1.

[0025] Wherein: the shell 1; the partition plate 2; the sound absorbing pipe 3; the sound absorbing cover 4; the sound absorbing body 5; the air inlet pipe 11; the air outlet pipe 12; the first chamber 21; the second chamber 22; the fourth through hole 23; the first sound absorbing layer 31; the second sound absorbing layer 32; the sealing layer 33; the second through hole 34; the third through hole 35; the first through hole 41; the sound absorbing chamber 42; the thin pipe 51; the chamber 52; the isolation net 121. DETAILED DESCRIPTION

[0026] To make the purposes, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0027] Embodiment 1

[0028] Reference Figures 1-5 The muffler comprises a shell 1, an air inlet pipe 11 and an air outlet pipe 12 arranged on the shell 1, the air inlet pipe 11 and / or the air outlet pipe 12 is connected with a muffling assembly located in the shell 1; the muffling assembly comprises a muffling cover 4 connected with the air inlet pipe 11 and / or the air outlet pipe 12 and a muffling body 5 connected with the muffling cover 4; the muffling body 5 performs muffling on the noise in the muffling cover 4 based on the Helmholtz resonance principle; and the muffling cover 4 performs muffling on the noise based on the expansion muffling principle.

[0029] In the embodiment, the air inlet pipe 11 and the air outlet pipe 12 are both connected with the muffling assembly located in the shell 1; the air inlet pipe 11 is communicated with the air outlet pipe of the diesel engine, and the muffling cover 4 is in the shape of a cylinder, so that when the exhaust noise of the diesel engine enters the muffling cover 4 from the air inlet pipe 11, the exhaust noise enters from a small space to a large space, thereby realizing the expansion muffling effect of the muffling cavity, and part of the exhaust noise enters the muffling body 5 from the muffling cover 4, the muffling body 5 performs resonance muffling on the noise based on the expansion muffling principle, and the muffling exhaust noise is discharged to the outside from the air outlet pipe 12.

[0030] Preferably, at least two partitions 2 are arranged in the shell 1, and the partitions 2 divide the shell 1 into at least two first cavities 21 and at least one second cavity 22 for resonance muffling of the exhaust noise, and two adjacent first cavities 21 are communicated through the second cavity 22; the muffling assembly is arranged in the first cavity 21; and the muffling cover 4 surrounds a muffling cavity 42 in the first cavity 21.

[0031] The specific working process of the muffler is as follows: when the exhaust noise of the diesel engine enters the muffling cavity 42 from the air inlet pipe 11, the noise is diffused, slowed down, interfered with each other in the muffling cavity to reduce the noise, and part of the noise entering the muffling cavity will enter the muffling body 5 to form resonance with the air column of the muffling body 5, so that part of the sound energy is converted into heat energy to reduce the noise. After the noise is attenuated by the muffling cavity 42 and the muffling body 5, the noise enters the second chamber 22, the second chamber 22 performs resonance muffling on the noise to further reduce the noise, and then the noise enters the muffling cavity 42 connected with the exhaust pipe 12. When the noise enters the muffling cavity 42 connected with the exhaust pipe 12, the noise is also diffused, slowed down, interfered with each other in the muffling cavity 42 connected with the exhaust pipe 12 to reduce the noise, and the muffling body 512 also performs resonance muffling on the noise. Finally, the noise is discharged to the outside through the exhaust pipe 12.

[0032] Preferably, the number of the partitions 2 is two, and the partitions 2 divide the shell 1 into two first chambers 21 and one second chamber 22; the second chamber 22 is provided with a muffling pipe assembly; the second chamber 22 is connected with two muffling cavities through the muffling pipe assembly.

[0033] In this embodiment, the exhaust noise is discharged to the outside through the air inlet pipe 11, the first chamber 21, the second chamber 22, the first chamber 21 and the exhaust pipe 12 in sequence. The second chamber 22 performs resonance muffling on the exhaust noise through the muffling pipe assembly, thereby reducing the noise.

[0034] Preferably, the muffling cover 4 is provided with a first through hole 42; the first chamber 21 is filled with first sound-absorbing cotton between the muffling cover 4.

[0035] In this embodiment, by arranging the first through hole 42, when the exhaust noise enters the muffling cavity 42 from the air inlet pipe 11, part of the noise can enter the muffling body 5 adopting the Helmholtz resonance principle for resonance muffling after the muffling cavity performs expansion muffling on the exhaust noise, and part of the noise can also be absorbed by the first sound-absorbing cotton through the first through hole 42, thereby greatly improving the muffling efficiency and effect of the first chamber 21.

[0036] Preferably, the muffling pipe assembly comprises a plurality of muffling pipes 3; the muffling pipe 3 is composed of a first muffling layer 31, a second muffling layer 32 and a sealing layer 33 from inside to outside; the first muffling layer 31 is provided with a second through hole 34; the second muffling layer 32 is provided with a third through hole 35; the diameter of the second through hole 34 is greater than the diameter of the third through hole 35.

[0037] In the embodiment, the shape of the sound attenuation pipe 3 is a cylinder, the diameter of the second through hole 34 is 3mm, and the diameter of the third through hole 35 is 1mm. The diameters of the second through hole 34 and the third through hole 35 can be set according to actual requirements. The porosities of the second through hole 34 and the third through hole 35 are both 5%. The second through hole 34 and the third through hole 35 are evenly distributed on the first sound attenuation layer 31 and the second sound attenuation layer 32 respectively. The outermost sealing layer 33 enables the noise in each sound attenuation pipe 3 to be independently attenuated, and in the process of resonance attenuation, the kinetic energy of vibration is converted into heat energy which is dissipated through the sealing layer 33. By setting the second through hole 34 and the third through hole 35, noise of different frequencies is attenuated, further improving the sound attenuation effect.

[0038] Preferably, a plurality of the sound attenuation pipes 3 are arranged in a circumferential array in the second chamber 22; and the two ends of the plurality of sound attenuation pipes 3 are respectively in communication with the sound attenuation cavities located at the two ends of the shell 1.

[0039] In the embodiment, the number of sound attenuation pipes 3 is 4, and the diameter of the sound attenuation pipe 3 is smaller than the diameter of the sound attenuation cover 4. By setting 4 sound attenuation pipes 3, not only the ventilation amount can meet the exhaust requirement, but also the contact area is increased, so that the noise can be fully resonated and attenuated.

[0040] Preferably, the second chamber 22 is filled with second sound-absorbing cotton between the second chamber 22 and the sound attenuation pipe 3; the fourth through hole 23 is arranged on the baffle 2 close to the air inlet pipe 11; and the fourth through hole 23 is used to move the exhaust noise of the sound attenuation cavity to the second sound-absorbing cotton.

[0041] In the embodiment, after the exhaust noise enters the sound attenuation cavity 42 from the air inlet pipe 11, part of the noise enters the second chamber 22 through the fourth through hole 23 and is absorbed by the second sound-absorbing cotton, further improving the sound attenuation effect.

[0042] Preferably, the sound attenuation body 5 is composed of a thin pipe 51 and a cavity 52; one end of the thin pipe 51 is in communication with the cavity 52, and the other end is in communication with the sound attenuation cavity.

[0043] In the embodiment, the sound attenuation body 5 is a Helmholtz resonator. When the noise enters the cavity 52, due to the change of acoustic resistance, part of the sound energy will be reflected back to the sound source and offset the original noise. At the same time, the noise and the air column in the thin pipe 51 resonate, so that part of the sound energy is converted into heat energy, thereby achieving the sound attenuation effect.

[0044] Preferably, the end of the exhaust pipe 12 is provided with a isolation net 121 for preventing foreign matters from entering. Small objects (such as small stones, leaves, etc.) or organisms (such as small mice, cockroaches, etc.) in the outside world are prevented from entering the sound attenuation device, thereby affecting the sound attenuation effect.

[0045] Although the embodiments of the utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. A muffler, comprising a housing, an intake pipe and an exhaust pipe disposed on the housing, characterized in that, The intake pipe and / or exhaust pipe are connected to a muffler assembly located within the housing; the muffler assembly includes a muffler cover connected to the intake pipe and / or exhaust pipe and a muffler body connected to the muffler cover; the muffler body muffles noise within the muffler cover based on the Helmholtz resonance principle; the muffler cover muffles noise based on the expansion muffler principle.

2. The silencer according to claim 1, characterized in that, The housing is provided with at least two partitions, which divide the housing into at least two first chambers and at least one second chamber for resonant silencing of exhaust noise. Adjacent first chambers are connected through the second chamber. The silencing assembly is disposed in the first chamber. The silencing cover forms a silencing cavity in the first chamber.

3. The silencer according to claim 2, characterized in that, The number of partitions is two, and the partitions divide the shell into two first chambers and one second chamber; the second chamber is provided with a silencer pipe assembly; the second chamber is connected to the two silencer chambers respectively through the silencer pipe assembly.

4. The silencer according to claim 2, characterized in that, The soundproof cover is provided with a first through hole; the first chamber and the soundproof cover are filled with a first sound-absorbing cotton.

5. The silencer according to claim 3, characterized in that, The muffler assembly includes multiple mufflers; each muffler consists of a first muffler layer, a second muffler layer, and a sealing layer from the inside out; the first muffler layer has a second through hole; the second muffler layer has a third through hole; the diameter of the second through hole is larger than the diameter of the third through hole.

6. The silencer according to claim 5, characterized in that, Multiple silencers are arranged in a circumferential array within the second chamber; the two ends of the multiple silencers are respectively connected to silencers located at both ends of the shell.

7. The silencer according to claim 2, characterized in that, The second chamber is filled with a second sound-absorbing cotton between itself and the silencer pipe; a fourth through hole is provided on the partition plate near the air intake pipe; the fourth through hole is used to move the exhaust noise of the silencer chamber to the second sound-absorbing cotton.

8. The silencer according to claim 1, characterized in that, The silencer consists of a thin tube and a cavity; one end of the thin tube is connected to the cavity, and the other end is connected to the silencer cavity.

9. The silencer according to claim 1, characterized in that, The end of the exhaust pipe is equipped with an isolation net to prevent foreign objects from entering.

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