High-performance silencer for diesel engine

Abstract

The utility model discloses a high-performance silencer for a diesel engine, and relates to the technical field of silencers, an air inlet pipe is connected with an exhaust port of the engine, exhaust gas is released in a first expansion chamber in a pressure reduction manner, and part of audio energy is reflected or refracted for multiple times through a pore plate; the other part of the air passes through a pore plate, is weakened by a silencing layer and a heat insulation layer, then reaches a shell I of the silencer, is reflected to the inner wall of the pore plate and is mixed with other audio energy for offsetting, the exhaust flows into a silencing cavity I, so that the exhaust is compressed again, part of the audio energy is filtered out after attenuation, and then the exhaust flows into an expansion chamber II; the exhaust enters the second line cavity silencing cavity through the second expansion chamber, the exhaust is compressed again, the second line cavity silencing cavity is communicated with the air outlet pipe, and the exhaust with the audio energy filtered out is exhausted through the air outlet pipe.

Description

TECHNICAL FIELD

[0001] The utility model relates to a muffler technical field, specifically a high performance muffler for diesel engine. BACKGROUND

[0002] In mobile power station, container power station, passenger ship, fixed machine room, hospital, school, kindergarten, office area and commercial and residential mixed area, the exhaust system of diesel generator set is required to meet the environmental protection requirements, and the noise reduction effect of the exhaust noise reduction system of the diesel generator set engine is required to be higher.

[0003] At present, the imported generator set from Europe is matched with the 15 to 25dB muffler entering the domestic market, most of which are in the form of side-in straight-out, one-stage expansion chamber and one-stage compound noise reduction cavity, and the muffler has good exhaust noise reduction effect and is widely used in the domestic market, especially in fixed building machine room and fixed container power station system, because the fixed machine room has large space, so the installation of the exhaust system does not need to consider the installation space problem, but the installation on the power car and the corresponding expansion application vehicle product has small space, and the noise reduction effect of the above-mentioned type of muffler is still insufficient to meet the actual field demand. The power car and some sites need a special-shaped muffler with small size, noise reduction index greater than 35dB and engine power loss less than 5%, which is used to solve the exhaust noise problem of the engine. SUMMARY

[0004] The utility model discloses a high performance muffler for diesel engine to solve the problem in prior art.

[0005] The explosion and turbulent gas discharged by the engine enter the muffler, and part of the audio frequency energy in the exhaust is offset by multiple reflection or refraction of the sound-absorbing material and the metal plate and the orifice plate, so that the audio frequency energy is weakened, and part of the audio frequency energy is converted into heat energy and discharged out of the muffler.

[0006] To achieve the above object, the utility model provides the following technical scheme: a high performance muffler for diesel engine, the muffler includes a shell, a heat insulation layer, a sound absorption layer, an orifice plate, a cavity noise reduction mechanism, an air inlet pipe and an air outlet pipe, the shell and the heat insulation layer are fixedly connected, the heat insulation layer and the sound absorption layer are fixedly connected, the sound absorption layer and the orifice plate are fixedly connected, the orifice plate is provided with a first expansion chamber, the first expansion chamber is communicated with the air inlet pipe, the orifice plate is provided with a second expansion chamber, the second expansion chamber is communicated with the air outlet pipe, the cavity noise reduction mechanism is provided with two, the orifice plate is provided with a first cavity sound absorption cavity, the orifice plate is provided with a second cavity sound absorption cavity, one cavity noise reduction mechanism is arranged in the first cavity sound absorption cavity, and the other cavity noise reduction mechanism is arranged in the second cavity sound absorption cavity.

[0007] By being provided with the air inlet pipe, the air inlet pipe is connected with the engine exhaust port, so that the engine exhaust gas enters the muffler through the air inlet pipe, is communicated with the first expansion chamber through the air inlet pipe, and the high-temperature and high-pressure exhaust gas of various frequency components of the engine enters the first expansion chamber, the first expansion chamber is larger than the air inlet air inlet volume, so that the exhaust gas is suddenly decompressed and released in the first expansion chamber, part of the audio frequency energy in the exhaust gas is reflected or refracted multiple times through the hole plate, is converted into heat energy, part of the audio frequency energy is weakened, another part passes through the inner wall hole plate, passes through the sound insulation layer and the heat insulation layer, and reaches the first outer shell of the muffler, and then is reflected to the inner wall hole plate, part of which passes through the hole plate again and mixes with other audio frequency energy in the first expansion chamber, so that part of the audio frequency energy is weakened by mutual offset, the exhaust gas flows into the first row cavity sound attenuation cavity in the low pressure direction, the exhaust gas is compressed again through the row cavity noise reduction mechanism, so that the audio frequency energy in the exhaust gas is attenuated and filtered again in the first row cavity sound attenuation cavity, the attenuated audio frequency energy and the exhaust gas flow to the second expansion chamber in the low pressure direction, so that the audio frequency energy in the exhaust gas is weakened or offset again through mixing and attenuation, the air inlet and the air outlet of the second expansion chamber are arranged on the same side, so that the second expansion chamber has a guiding function, so that the gas is turned by 180 degrees through the guiding function and is discharged from the air inlet direction, and then the audio frequency energy and the exhaust gas are reversed after entering the second row cavity sound attenuation cavity through the second expansion chamber with the guiding function, so that the exhaust gas is compressed again, so that the audio frequency energy in the exhaust gas is attenuated and filtered again in the second row cavity sound attenuation cavity, the second row cavity sound attenuation cavity is communicated with the air outlet pipe, so that the exhaust gas with filtered audio frequency energy is discharged to the atmosphere through the air outlet pipe, the fixed interface mode of the first outer shell, the heat insulation layer, the sound insulation layer, the hole plate, the air inlet pipe and the air outlet pipe plate is welding, and all are full welding, so as to ensure that the cavities are not leaked and isolated, and the noise reduction effect is maximized.

[0008] Further, the row cavity noise reduction mechanism comprises a fixed cap, an audio scattering isolation pile and a fixed block, the fixed cap is provided with two, the two fixed caps are fixedly connected with the audio scattering isolation pile, the fixed block is provided with six, three fixed blocks are fixedly connected with the fixed cap, and the fixed block is connected with the hole plate.

[0009] The two ends of the cylindrical audio scattering isolation pile are fixed with the two fixed caps through the two fixed caps, and the audio scattering isolation pile is fixed at both ends through the six fixed blocks, one end of every three fixed blocks is fixedly connected with the fixed cap, and the other end is fixedly connected with the hole plate, so that the audio scattering isolation pile is fixed at both ends, and the audio frequency energy in the exhaust gas entering the first row cavity sound attenuation cavity and the second row cavity sound attenuation cavity is reflected or refracted multiple times between the audio scattering isolation pile and the hole plate, part of the audio frequency energy passes through the hole plate, and the audio frequency energy is weakened through the audio scattering isolation pile and the sound insulation layer, so that the audio frequency energy of the exhaust gas is attenuated, and the noise reduction effect is enhanced.

[0010] Further, the audio scattering isolation pile comprises a second shell and an acoustic absorption core body, and the second shell and the acoustic absorption core body are fixedly connected.

[0011] The audio energy is reflected or refracted multiple times between the audio scattering isolation pile and the hole plate, and part of the audio energy is allowed to pass through the second shell during the multiple reflections or refractions by arranging the acoustic absorption core body in the second shell, so that the audio energy is absorbed by the acoustic absorption core body, thereby weakening the audio energy and enhancing the sound insulation effect.

[0012] Further, the sound insulation layer is made of aluminum silicate or rock wool with a temperature resistance of 1200 DEG C or above, the acoustic absorption core body is made of rock wool, and the heat insulation layer is made of rock wool.

[0013] The sound insulation layer 3 is made of aluminum silicate or rock wool with a temperature resistance of 1200 DEG C or above, so that the sound insulation layer has good fireproof effect and can withstand high temperature environment and is not easy to deform or fail due to high temperature, so that it can maintain stable sound insulation performance for a long time.

[0014] Further, the hole plate is made of steel plate, the second shell is made of steel plate, and the heat insulation layer and the sound insulation layer are coated with a layer of ceramic glass fiber cloth on the outside.

[0015] The steel hole plate with a hole diameter of 4 mm and a punching rate of greater than 25% and the steel second shell are arranged, so that the audio energy can be reflected, so that the audio energy can be reflected or refracted multiple times to be converted into heat energy, and then part of the audio energy can be weakened.

[0016] Further, the second expansion chamber is larger than the first expansion chamber, and the second row cavity sound absorption cavity is larger than the first expansion chamber.

[0017] The second expansion chamber is larger than the first expansion chamber, the cross-sectional area of the gas inlet of the second row cavity sound absorption cavity is larger than that of the first expansion chamber, and the proportional coefficient is 1.2 to 1.4, so that the exhaust resistance generated by the wall effect of the fluid is offset or reduced, thereby enhancing the effect of exhaust noise sound insulation, and being beneficial to reducing the length of the exhaust pipe, thereby reducing the use of materials.

[0018] Compared with the prior art, the audio scattering isolation pile has the following advantages:

[0019] 1. Through the perforated plate inside the muffler, the audio energy in the engine exhaust is reflected or refracted multiple times and converted into heat energy. Some of the audio energy is weakened, while the other part passes through the perforated plate, is weakened by the sound-absorbing layer of the noise-reducing material, and reaches the outer wall of the muffler. Then it is reflected to the inner wall of the perforated plate. Part of it passes through the perforated plate and mixes with other audio energy in the room. Some frequency energy cancels each other out. At this time, the main low-frequency and some high-frequency audio energy is attenuated and part of it is converted into heat energy, thereby achieving the effect of noise reduction and sound silencing.

[0020] 2. The No. 2 expansion chamber is larger than the No. 1 expansion chamber, and the cross-sectional area of ​​the No. 2 silencer inlet is larger than that of the No. 1 expansion chamber, with a proportional coefficient of 1.2 to 1.4. This makes the exhaust resistance generated by the fluid wall effect offset or reduced, thereby enhancing the exhaust noise reduction effect. At the same time, it is beneficial to shorten the exhaust pipe length, thereby reducing the amount of material used, and thus reducing the overall size of the silencer, thereby meeting the needs of installation in confined spaces. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0023] Figure 3 This is a schematic diagram showing the connection between the No. 1 cavity silencing chamber and the No. 1 expansion chamber of this utility model;

[0024] Figure 4 This is a schematic diagram of the connection block of this utility model;

[0025] Figure 5 yes Figure 3 A magnified view of a portion of A.

[0026] In the diagram: 1. Outer shell No. 1; 2. Heat insulation layer; 3. Sound absorption layer; 4. Perforated plate; 41. Expansion chamber No. 1; 42. Expansion chamber No. 2; 43. Sound absorption chamber No. 1; 44. Sound absorption chamber No. 2; 5. Noise reduction mechanism for the cavity; 51. Fixing cap; 52. Audio scattering isolation pile; 521. Outer shell No. 2; 522. Sound absorbing core; 6. Air inlet pipe; 7. Air outlet pipe. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Embodiment: as Figures 1-4 The utility model provides a high -performance muffler for diesel engine technical scheme, a high -performance muffler for diesel engine, the muffler includes one shell 1, heat insulating layer 2, silencer layer 3, orifice plate 4, line cavity noise reduction mechanism 5, intake pipe 6 and outlet pipe 7, one shell 1 and heat insulating layer 2 fixed connection, heat insulating layer 2 and silencer layer 3 fixed connection, silencer layer 3 and orifice plate 4 fixed connection, orifice plate 4 is equipped with one expansion chamber 41, one expansion chamber 41 and intake pipe 6 intercommunication, orifice plate 4 is equipped with second expansion chamber 42, second expansion chamber 42 and outlet pipe 7 intercommunication, line cavity noise reduction mechanism 5 is equipped with two, orifice plate 4 is equipped with one line cavity silencer chamber 43, orifice plate 4 is equipped with second line cavity silencer chamber 44, one line cavity noise reduction mechanism 5 is placed in one line cavity silencer chamber 43, and another line cavity noise reduction mechanism 5 is placed in second line cavity silencer chamber 44.

[0029] Through being equipped with intake pipe 6, intake pipe 6 is connected with the engine exhaust, makes the engine exhaust gas through intake pipe 6 into the muffler, through one expansion chamber 41 and intake pipe 6 intercommunication, makes the engine various frequency component high temperature high pressure exhaust gas into one expansion chamber 41, one expansion chamber 41 than intake intake volume is big, makes the exhaust gas suddenly decompression release in one expansion chamber 41, one part of audio frequency energy in exhaust gas through orifice plate 4 multiple reflection or refraction, converts into heat energy, and part of audio frequency energy can be weakened, another part reaches the muffler one shell 1 after weakening through silencer layer 3 and heat insulating layer 2 after passing through inner wall orifice plate 4, then is reflected to orifice plate 4 inner wall, wherein one part passes through orifice plate 4 again and mixes with other audio frequency energy of exhaust gas in one expansion chamber 41, so that part of audio frequency energy is weakened by mutual cancellation, and exhaust gas flows into one line cavity silencer chamber 43 along low pressure direction, through being equipped with line cavity noise reduction mechanism 5, makes exhaust gas be compressed again, thereby the audio frequency energy in exhaust gas is filtered again in one line cavity silencer chamber 43 after attenuation, and the audio frequency energy after attenuation and exhaust gas flow to second expansion chamber 42 along low pressure direction, so that the audio frequency energy in exhaust gas is weakened or cancelled again by mixing and attenuating, through setting the intake and outlet of second expansion chamber 42 on the same side, make second expansion chamber 42 have the function of guiding, thereby make gas be discharged from the intake direction after 180 of guiding turn, further make the audio frequency energy and exhaust gas enter second line cavity silencer chamber 44 after reversing after passing through the second expansion chamber 42 of guiding function, make exhaust gas be compressed again, make the audio frequency energy in exhaust gas be filtered again in second line cavity silencer chamber 44 after attenuation, through second line cavity silencer chamber 44 and outlet pipe 7 intercommunication, make the exhaust gas of filtering audio frequency energy be discharged to the atmosphere through outlet pipe 7, the fixed interface mode of one shell 1, heat insulating layer 2, silencer layer 3, orifice plate 4, intake pipe 6 and outlet pipe 7 plate material is welding, and all are full welding, thereby ensure that the cavity is not leaked and is isolated, and the effect of noise reduction is improved to the maximum.

[0030] AsFigures 2-5 As shown, the row cavity noise reduction mechanism 5 includes fixed caps 51, audio scattering isolation piles 52, and fixed blocks 53, two fixed caps 51 are provided, the two fixed caps 51 and the audio scattering isolation piles 52 are fixedly connected, six fixed blocks 53 are provided, three fixed blocks 53 and the fixed caps 51 are fixedly connected, and the fixed blocks 53 and the hole plate 4 are connected.

[0031] Through the two fixed caps 51, the cylindrical audio scattering isolation piles 52 are fixed at both ends of the two fixed caps 51, through the six fixed blocks 53, every three fixed blocks 53 are fixedly connected at one end of the fixed caps 51 and fixedly connected at the other end of the hole plate 4, so that the audio scattering isolation piles 52 are fixed at both ends, through the cooperation of the audio scattering isolation piles 52 and the hole plate 4, the audio energy in the exhaust entering the first row cavity muffling cavity 43 and the second row cavity muffling cavity 44 is reflected or refracted multiple times between the audio scattering isolation piles 52 and the hole plate 4, part of the audio energy passes through the hole plate 4, and the audio energy is weakened through the audio scattering isolation piles 52 and the muffling layer 3, so that the audio energy of the exhaust is attenuated, and the noise reduction effect is enhanced.

[0032] As shown in the figure, Figure 3 The audio scattering isolation pile 52 includes a second shell 521 and an acoustic core 522, and the second shell 521 and the acoustic core 522 are fixedly connected.

[0033] The audio energy is reflected or refracted multiple times between the audio scattering isolation pile 52 and the hole plate 4, the acoustic core 522 is arranged in the second shell 521, part of the audio energy passes through the second shell 521 when reflected or refracted multiple times, the audio energy is absorbed by the acoustic core 522, so that the audio energy is weakened, and the muffling effect is enhanced.

[0034] As shown in the figure, Figure 1 The muffling layer 3 is made of aluminum silicate or rock wool with a temperature resistance of 1200℃ or above, the acoustic core 522 is made of rock wool, and the heat insulation layer 2 is made of rock wool.

[0035] The muffling layer 3 is made of aluminum silicate or rock wool with a temperature resistance of 1200℃ or above, so that the muffling layer 3 has good fireproof effect and can withstand high temperature environment and is not easy to deform or fail due to high temperature, so that it can maintain stable sound insulation performance for a long time, and the acoustic core 522 and the heat insulation layer 2 are made of rock wool, which can effectively prevent heat transfer and help reduce heat loss.

[0036] As shown in the figure, Figure 2 The hole plate 4 is made of steel plate, the second shell 521 is made of steel plate, and the heat insulation layer 2 and the muffling layer 3 are coated with a layer of ceramic glass cloth on the outside.

[0037] Through the steel hole plate 4 with aperture diameter of 4mm and punching rate of more than 25% and the steel No. 2 shell 521, the audio energy can be reflected, so that the audio energy can be converted into heat energy through multiple reflections or refractions, and then part of the audio energy can be weakened. Meanwhile, a layer of ceramic glass cloth is coated outside the heat insulation layer 2 and the sound insulation layer 3, so that it can withstand high temperature environment and maintain stable performance for a long time without being easily deformed.

[0038] As shown in Figure 2 The No. 2 expansion chamber 42 is larger than the No. 1 expansion chamber 41, and the No. 2 row cavity sound attenuation chamber 44 is larger than the No. 1 expansion chamber 41.

[0039] Through the No. 2 expansion chamber 42 being larger than the No. 1 expansion chamber 41, the cross-sectional area of the gas inlet of the No. 2 row cavity sound attenuation chamber 44 is larger than that of the No. 1 expansion chamber 41, and the proportional coefficient is 1.2 to 1.4, so that the exhaust resistance caused by the skin effect of the fluid is offset or reduced, thereby enhancing the effect of exhaust noise attenuation and being beneficial to shorten the length of the exhaust pipe and thereby reduce the use of materials.

[0040] Working principle: through the connection of the intake pipe 6 and the engine exhaust port, the high-temperature and high-pressure exhaust gas of various frequency components of the engine flows into the No. 1 expansion chamber 41, and the exhaust gas is released by decompression in the No. 1 expansion chamber 41. The fixed cap 51 is set as a circular truncated cone, and the top surface of the fixed cap 51 faces the intake pipe 6, so that the gas entering the No. 1 expansion chamber 41 flows towards the hole plate 4, and part of the audio energy in the exhaust gas is reflected or refracted multiple times through the hole plate 4, thereby weakening the audio energy. Another part passes through the hole plate 4, attenuates through the sound insulation layer 3 and the heat insulation layer 2, and then reaches the sound attenuator No. 1 shell 1, and then is reflected to the inner wall of the hole plate 4. Part of the audio energy and other audio energy in the exhaust gas in the No. 1 expansion chamber 41 mix and offset each other, and the exhaust gas enters the No. 1 row cavity sound attenuation chamber 43 along the flow direction. Through the audio scattering isolation pile 52, the exhaust gas is re-compressed, part of the audio energy is reflected or refracted multiple times through the No. 2 shell 521 and the hole plate 4, and another part of the audio energy passes through the No. 2 shell 521 and the hole plate 4, attenuates through the audio scattering isolation pile 52 and the sound insulation layer 3, so that the audio energy is attenuated, and the attenuated audio energy enters the No. 2 expansion chamber 42 along the flow direction with the exhaust gas, so that the audio energy in the exhaust gas is weakened or offset again through mixing and attenuation. The exhaust gas enters the No. 2 row cavity sound attenuation chamber 44 through the No. 2 expansion chamber 42, so that the exhaust gas is re-compressed again, and the audio energy in the exhaust gas is filtered again through the attenuation in the No. 2 row cavity sound attenuation chamber 44. Through the communication of the No. 2 row cavity sound attenuation chamber 44 and the exhaust pipe 7, the exhaust gas with filtered audio energy is discharged to the atmosphere through the exhaust pipe 7.

[0041] It is apparent for a person skilled in the art that the present application is not restricted to the details of the above exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary only, and not limiting, the scope of the present application being defined by the appended claims rather than by the above description, and all changes coming within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims concerned.

Claims

1. A high-performance muffler for a diesel engine, characterized by: The muffler comprises a first shell (1), a heat insulation layer (2), a sound insulation layer (3), a hole plate (4), a row cavity noise reduction mechanism (5), an air inlet pipe (6) and an air outlet pipe (7), the first shell (1) is fixedly connected with the heat insulation layer (2), the heat insulation layer (2) is fixedly connected with the sound insulation layer (3), the sound insulation layer (3) is fixedly connected with the hole plate (4), the hole plate (4) is provided with a first expansion chamber (41), the first expansion chamber (41) is communicated with the air inlet pipe (6), the hole plate (4) is provided with a second expansion chamber (42), the second expansion chamber (42) is communicated with the air outlet pipe (7), the row cavity noise reduction mechanism (5) is provided with two, the hole plate (4) is provided with a first row cavity sound insulation cavity (43), the hole plate (4) is provided with a second row cavity sound insulation cavity (44), one row cavity noise reduction mechanism (5) is arranged in the first row cavity sound insulation cavity (43), and the other row cavity noise reduction mechanism (5) is arranged in the second row cavity sound insulation cavity (44).

2. A high performance muffler for a diesel engine according to claim 1, characterized in that: The row cavity noise reduction mechanism (5) comprises a fixed cap (51), an audio scattering isolation pile (52) and a fixed block (53), the fixed cap (51) is provided with two, the two fixed caps (51) are fixedly connected with the audio scattering isolation pile (52), the fixed block (53) is provided with six, three fixed blocks (53) are fixedly connected with the fixed cap (51), and the fixed block (53) is fixedly connected with the hole plate (4).

3. A high performance muffler for a diesel engine according to claim 2, characterized in that: The audio scattering isolation pile (52) comprises a second shell (521) and a sound absorption core body (522), and the second shell (521) is fixedly connected with the sound absorption core body (522).

4. A high performance muffler for a diesel engine according to claim 3, characterized in that: The sound insulation layer (3) is made of aluminum silicate or rock wool with a temperature resistance of 1200 DEG C or above, the sound absorption core body (522) is made of rock wool, and the heat insulation layer (2) is made of rock wool.

5. A high performance muffler for a diesel engine according to claim 4, characterized in that: The hole plate (4) is made of a steel plate, the second shell (521) is made of a steel plate, and the heat insulation layer (2) and the sound insulation layer (3) are coated with a layer of ceramic glass fiber cloth on the outside.

6. A high performance muffler for a diesel engine according to claim 5, characterized in that: The second expansion chamber (42) is larger than the first expansion chamber (41), and the second row cavity sound insulation cavity (44) is larger than the first expansion chamber (41).

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