A silencer
By designing a muffler that includes a housing, chamber partition, intake pipe, muffler pipe, and switching valve, the problem of engine noise reduction under different operating conditions is solved, achieving effective noise reduction at low speed or idling and ensuring power performance at medium and high speed.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- DONGFENG MOTOR GRP
- Filing Date
- 2023-07-05
- Publication Date
- 2026-05-26
AI Technical Summary
Existing mufflers are insufficient to meet the noise reduction requirements of engines under different operating conditions. In particular, exhaust noise is relatively high at low speeds or idling, while exhaust noise is relatively insignificant at medium and high speeds, and the noise reduction requirements are not high.
A silencer was designed, comprising a housing, a chamber partition, an intake pipe, a silencer pipe, and a switching valve. The switching valve controls the opening and closing of the exhaust passage. By combining the structures of the expansion silencer chamber, the Helmholtz silencer chamber, and the exhaust silencer chamber, noise reduction treatment under different working conditions can be achieved.
At low speeds or idling, the exhaust passage is closed by the switching valve to achieve effective noise reduction; at medium and high speeds, the exhaust passage is opened by the switching valve to ensure engine power performance and meet the noise reduction requirements under different operating conditions.
Smart Images
Figure CN116877231B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of vehicle technology, and more particularly to a muffler. Background Technology
[0002] Vehicle engines produce exhaust gases during combustion, which generate a certain amount of exhaust noise. The exhaust gases need to pass through a muffler for noise reduction. However, current mufflers often fail to meet the noise reduction requirements of engines under various operating conditions. Summary of the Invention
[0003] In view of this, the embodiments of this application aim to provide a muffler to meet the noise reduction requirements of engines under different operating conditions.
[0004] To achieve the above objectives, a first aspect of this application provides a muffler, including a housing, chamber partitions, an intake pipe, a muffler pipe, an exhaust pipe assembly, and a switching valve. The chamber partitions and the muffler pipe are both located within the housing. The exhaust pipe assembly is at least partially located within the housing. The intake pipe is used to connect to the exhaust pipe of a vehicle's engine. There are multiple chamber partitions, and the housing and the multiple chamber partitions enclose multiple mutually separated muffler chambers. The multiple muffler chambers are arranged sequentially along the length of the housing. At least one muffler chamber is an expansion muffler chamber, which communicates with the intake pipe. At least one muffler chamber is a Helmholtz muffler chamber. The expansion muffler chamber and the Helmholtz muffler... The chambers are connected via the silencer pipes, and at least one of the silencer chambers is an exhaust silencer chamber. The exhaust silencer chamber is located downstream of the expansion silencer chamber along the exhaust path of the silencer. The exhaust silencer chamber is connected to the outside of the housing via the exhaust pipe assembly. The exhaust pipe assembly is used to silence the airflow flowing through the exhaust pipe assembly. The silencer has an exhaust passage for connecting the expansion silencer chamber and the exhaust silencer chamber. The exhaust passage passes through the chamber partition between the expansion silencer chamber and the exhaust silencer chamber. The switching valve is used to open the exhaust passage to connect the exhaust silencer chamber and the expansion silencer chamber, or the switching valve is used to close the exhaust passage to disconnect the exhaust silencer chamber and the expansion silencer chamber.
[0005] The expanded anechoic chamber is located between the exhaust anechoic chamber and the Helmholtz anechoic chamber.
[0006] In one embodiment, the chamber partition between the expansion silencing chamber and the exhaust silencing chamber is a first partition, and the intake pipe includes:
[0007] An intake section is provided, which penetrates the side wall of the housing at a position corresponding to the exhaust silencer. The intake section is partially located inside the exhaust silencer. One end of the intake section facing the expansion silencer passes through the first partition. The pipe wall of the intake section is closed.
[0008] A first silencing section is connected to the air intake section. The first silencing section is at least partially located within the expansion silencing chamber. The pipe wall of the first silencing section has a first silencing hole that communicates with the expansion silencing chamber. The first silencing hole is located within the expansion silencing chamber.
[0009] In one embodiment, the chamber partition between the expansion anechoic chamber and the Helmholtz anechoic chamber is a second partition, the first anechoic section spans the first partition and the second partition, and the first anechoic section is connected to the anechoic pipe.
[0010] In one embodiment, the silencer pipe includes:
[0011] The first transition section is used to receive the gas flowing into the Helmholtz anechoic chamber, and the first transition section is connected to the first anechoic section;
[0012] A first through section, one end of which is connected to the first transition section, and the first through section penetrates the second partition;
[0013] The second transition section, one end of which is connected to the other end of the first through section;
[0014] The second through section, the other end of the second transition section is connected to the second through section, the second through section penetrates the second partition, and the gas in the second through section is discharged into the Helmholtz anechoic chamber.
[0015] In one embodiment, the first through-segment is located below the first transition segment, and the second through-segment is located below the first through-segment.
[0016] In one embodiment, the wall of the silencer pipe is sealed.
[0017] In one embodiment, the muffler further includes a muffler baffle having a plurality of second muffler holes arranged axially along the length of the housing. The muffler baffle is located in the exhaust muffler chamber to divide the exhaust muffler chamber into two sub-chambers arranged along the length of the housing.
[0018] In one embodiment, the exhaust pipe assembly includes two exhaust pipe components. The exhaust silencer chamber and the outside of the housing are connected through the exhaust pipe components. One of the exhaust pipe components penetrates the silencer baffle, and the end of the exhaust pipe component that penetrates the silencer baffle, away from the expansion silencer chamber, penetrates the shell wall of the housing. The other exhaust pipe component penetrates the chamber partition, and the end of the exhaust pipe component that penetrates the chamber partition, away from the exhaust silencer chamber, penetrates the shell wall of the housing.
[0019] In one embodiment, the exhaust pipe component includes:
[0020] The exhaust silencer chamber and the outside of the shell are connected through the pipe body, and a third silencer hole is formed on the side wall of the pipe body;
[0021] A glass fiber sound-absorbing element is wrapped around the outside of the tube body, and the glass fiber sound-absorbing element covers the third sound-absorbing hole.
[0022] In one embodiment, the pipe body includes a receiving section, a second silencing section, and an exhaust section connected in sequence. The receiving section is partially located in the exhaust silencing chamber, and the exhaust section is used to connect to a tailpipe that receives the gas discharged from the silencer. The diameters of the receiving section and the exhaust section are larger than the diameter of the second silencing section.
[0023] In this embodiment of the muffler, the exhaust passage serves as a channel connecting the expansion muffler chamber and the exhaust muffler chamber. When the exhaust passage is closed by the switching valve, the expansion muffler chamber and the exhaust muffler chamber are disconnected. Gas entering the expansion muffler chamber through the intake pipe cannot enter the exhaust muffler chamber and cannot be exhausted through the muffler. When the engine is at low speed or idling, the switching valve closes the exhaust passage, and the gas discharged from the engine enters the expansion muffler chamber and the Helmholtz muffler chamber through the intake pipe for noise reduction. Gas in the expansion muffler chamber cannot enter the exhaust muffler chamber through the exhaust passage, and the engine cannot exhaust through the muffler. The engine exhaust back pressure is relatively high, and correspondingly, the back pressure of the expansion muffler chamber and the Helmholtz muffler chamber is also relatively high. Under the high back pressure, the expansion muffler chamber and the Helmholtz muffler chamber can effectively reduce the relatively prominent exhaust noise of the engine at low speed or idling, resulting in a good noise reduction effect and effectively reducing the exhaust noise of the engine at low speed or idling. When the engine is operating at medium to high speeds, the exhaust noise is relatively insignificant, and the requirements for muffler noise reduction are not too high. The switching valve opens the exhaust passage, connecting the expansion muffler chamber and the exhaust muffler chamber. Gas discharged from the engine through the intake manifold into the expansion muffler chamber flows through the exhaust passage into the exhaust muffler chamber and then through the exhaust pipe assembly to the outside of the muffler casing. The engine's exhaust back pressure is low, which effectively ensures the engine's power performance. By switching the opening and closing state of the exhaust passage using the switching valve, the noise reduction requirements of the engine under different operating conditions can be met. In addition, both the expansion muffler and the Helmholtz muffler are blocked on the side away from the exhaust muffler by the chamber partition between the expansion muffler and the exhaust muffler. The Helmholtz muffler is not adjacent to the exhaust muffler. Even if the sealing of the Helmholtz muffler is poor, the gas in the Helmholtz muffler will not flow to the exhaust muffler through the chamber partition between the Helmholtz muffler and the expansion muffler. As long as the sealing between the expansion muffler and the exhaust muffler is good enough, the engine can have a large exhaust back pressure when the switching valve closes the exhaust passage. Under low speed or idling conditions, this improves the reliability of noise reduction and silencing of the engine under large back pressure, which is conducive to ensuring a better silencing effect of the muffler. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the structure of a muffler according to an embodiment of this application. The internal structure of the muffler housing is not shown in the figure.
[0025] Figure 2 for Figure 1 View A in the middle;
[0026] Figure 3 This is a schematic diagram of the structure of a muffler according to an embodiment of this application, showing the internal structure of the muffler housing;
[0027] Figure 4 for Figure 3 A magnified view at position B in the middle;
[0028] Figure 5 for Figure 3 A magnified view at position C in the middle;
[0029] Figure 6 This is an assembly diagram of the silencing baffle, exhaust pipe assembly, intake pipe, muffler, first baffle, second baffle and switching valve according to an embodiment of this application.
[0030] Explanation of reference numerals in the attached drawings: Shell 1; Cylinder 11; End plate 12; First partition 21; Second partition 22; Inlet pipe 3; Inlet section 31; First silencer section 32; First silencer hole 321; Silencer pipe 4; First transition section 41; First through section 42; Second transition section 43; Second through section 44; Exhaust pipe assembly 5; Exhaust pipe component 51; Pipe body 511; Receiving section 5112; Second silencer section 5113; Exhaust section 5114; Fiberglass sound absorber 512; Switching valve 6; Expansion silencer chamber 71; Helmholtz silencer chamber 72; Exhaust silencer chamber 73; Sub-chamber 731; Silencer partition 8; Second silencer hole 81. Detailed Implementation
[0031] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed descriptions in the specific implementation should be understood as explanations of the purpose of this application and should not be regarded as undue limitations on this application.
[0032] In related technologies, when the engine is operating at low speed or idling, engine noise, vehicle wind noise, and road noise are relatively low. At this time, engine exhaust noise is relatively prominent, requiring higher standards for exhaust noise reduction. When the engine is operating at medium to high speeds, engine noise, vehicle wind noise, road noise, and other noises are relatively high. At this time, engine exhaust noise is relatively less noticeable, requiring lower standards for exhaust noise reduction. The critical speed for different operating conditions can be set according to actual needs.
[0033] Therefore, this application provides a muffler in its embodiments. Please refer to [link to relevant documentation]. Figures 1-6The muffler includes a housing 1, chamber partitions, an intake pipe 3, a muffler pipe 4, an exhaust pipe assembly 5, and a switching valve 6. The chamber partitions and muffler pipe 4 are both located within the housing 1, and the exhaust pipe assembly 5 is at least partially located within the housing 1. The intake pipe 3 connects to the exhaust pipe of the vehicle's engine. Multiple chamber partitions are present, forming multiple mutually separated muffler chambers. These chambers are arranged sequentially along the length of the housing 1. With this structure, the intake pipe 3 connects to the exhaust pipe of the vehicle's engine, and the exhaust gas from the engine enters the muffler's muffler chambers through the intake pipe 3 for noise reduction, thereby lowering the engine's exhaust noise.
[0034] Please see Figure 1 and Figure 3 In this embodiment of the application, the length direction of the housing 1 is the direction shown by arrow R1 in the figure.
[0035] In one embodiment, please refer to Figure 3 and Figure 4 At least one silencing chamber is an expansion silencing chamber 71, which is connected to the intake pipe 3. With this structure, because the expansion silencing chamber 71 is connected to the intake pipe 3, the exhaust gas from the engine flows through the intake pipe 3 to the expansion silencing chamber 71, where it undergoes initial noise reduction. The expansion silencing chamber 71 can reduce noise in most frequency bands of the engine exhaust noise.
[0036] It should be noted that the expansion anechoic chamber 71 achieves noise reduction through changes in the size of the space or the size of the cross-section.
[0037] In one embodiment, please refer to Figure 3 and Figure 4 At least one silencing chamber is a Helmholtz silencing chamber 72, and the expansion silencing chamber 71 and the Helmholtz silencing chamber 72 are connected by a silencer pipe 4. With this structure, since the expansion silencing chamber 71 and the Helmholtz silencing chamber 72 are connected by the silencer pipe 4, a portion of the gas entering the expansion silencing chamber 71 through the intake pipe 3 can enter the Helmholtz silencing chamber 72 through the silencer pipe 4 for silencing. The Helmholtz silencing chamber 72 can effectively silence lower-frequency exhaust noise that is difficult to reduce in the expansion silencing chamber 71.
[0038] It should be noted that, apart from the inlet for air intake into the Helmholtz anechoic chamber 72, there are no other channels connecting the Helmholtz anechoic chamber 72 to the space outside the Helmholtz anechoic chamber 72, and the Helmholtz anechoic chamber 72 is almost in a relatively closed space.
[0039] In one embodiment, please refer to Figure 3 and Figure 5At least one silencing chamber is an exhaust silencing chamber 73, located downstream of the expansion silencing chamber 71 along the exhaust path of the muffler. The exhaust silencing chamber 73 is connected to the outside of the housing 1 via an exhaust pipe assembly 5, which is used to silence the airflow passing through it. The muffler has an exhaust passage connecting the expansion silencing chamber 71 and the exhaust silencing chamber 73, which passes through the chamber partition between the expansion silencing chamber 71 and the exhaust silencing chamber 73. A switching valve 6 is used to open the exhaust passage to connect the exhaust silencing chamber 73 and the expansion silencing chamber 71, or to close the exhaust passage to disconnect the exhaust silencing chamber 73 and the expansion silencing chamber 71. In this configuration, the exhaust passage serves as a connection between the expansion silencing chamber 71 and the exhaust silencing chamber 73. When the exhaust passage is closed by the switching valve 6, the expansion silencing chamber 71 and the exhaust silencing chamber 73 are disconnected, and the gas entering the expansion silencing chamber 71 via the intake pipe 3 cannot enter the exhaust silencing chamber 73 and cannot be exhausted through the muffler. When the engine is operating at low speed or idling, the switching valve 6 closes the exhaust passage. The gas discharged from the engine enters the expansion muffler 71 and the Helmholtz muffler 72 through the intake pipe 3 for noise reduction. The gas in the expansion muffler 71 cannot enter the exhaust muffler 73 through the exhaust passage, and the engine cannot exhaust through the muffler. The exhaust back pressure of the engine is relatively large, and correspondingly, the back pressure of the expansion muffler 71 and the Helmholtz muffler 72 is also relatively large. Under the large back pressure, the expansion muffler 71 and the Helmholtz muffler 72 can effectively reduce the relatively prominent exhaust noise of the engine under low speed or idling conditions, and have a good noise reduction effect. It can effectively reduce the exhaust noise of the engine under low speed or idling conditions. When the engine is operating at medium to high speeds, the exhaust noise is relatively insignificant, and the noise reduction requirements for the muffler are not very high. Switching valve 6 opens the exhaust passage, connecting the expansion muffler chamber 71 and the exhaust muffler chamber 73. Gas discharged from the engine via intake pipe 3 to the expansion muffler chamber 71 can flow through the exhaust passage to the exhaust muffler chamber 73 and then through exhaust pipe assembly 5 to the outside of the casing, thus exiting the muffler. The engine's exhaust back pressure is low, which effectively ensures the engine's power performance. Switching the opening and closing state of the exhaust passage via switching valve 6 can meet the engine's noise reduction needs under different operating conditions.
[0040] It should be noted that the switching valve 6 is used to close the exhaust passage to disconnect the exhaust silencer 73 and the expansion silencer 71. When the switching valve 6 closes the exhaust passage, the gas in the expansion silencer 71 will hardly flow to the exhaust silencer 73. There are almost no normally open holes on the chamber partition between the expansion silencer 71 and the exhaust silencer 73 for the gas in the expansion silencer 71 to flow to the exhaust silencer 73.
[0041] In one embodiment, please refer to Figure 3 and Figure 4The expansion muffler 71 is located between the exhaust muffler 73 and the Helmholtz muffler 72. In this configuration, both the expansion muffler 71 and the Helmholtz muffler 72 are blocked from the exhaust muffler 73 by a chamber partition between them. The Helmholtz muffler 72 is not adjacent to the exhaust muffler 73. Even if the sealing of the Helmholtz muffler 72 is poor, the gas inside it will not flow to the exhaust muffler 73 through the chamber partition between the Helmholtz muffler 72 and the expansion muffler 71. As long as the sealing between the expansion muffler 71 and the exhaust muffler 73 is sufficiently good, the engine can have a large exhaust back pressure when the switching valve 6 closes the exhaust passage. This improves the reliability of noise reduction under high back pressure when the engine is at low speed or idling, thus ensuring a better muffler effect.
[0042] In one embodiment, please refer to Figure 3 , Figure 4 and Figure 6 The chamber partition between the expansion silencing chamber 71 and the exhaust silencing chamber 73 is the first partition 21.
[0043] For example, please refer to Figure 3 Both the expansion anechoic chamber 71 and the Helmholtz anechoic chamber 72 are blocked by the first partition 21 on the side opposite to the exhaust anechoic chamber 73.
[0044] In one embodiment, please refer to Figure 3 and Figure 6 The switching valve 6 is installed on the first partition 21.
[0045] In one embodiment, the switching valve 6 may be installed in the housing 1.
[0046] In one embodiment, please refer to Figure 3 , Figure 4 and Figure 6 The intake pipe 3 includes an intake section 31. The intake section 31 penetrates the side wall of the housing 1 at a position corresponding to the exhaust muffler 73. The intake section 31 is partially located within the exhaust muffler 73, with one end of the intake section 31 facing the expansion muffler 73 passing through the first partition 21. The pipe wall of the intake section 31 is sealed. With this structure, although the intake section 31 is partially located within the exhaust muffler 73, the engine exhaust gas received by the intake section 31 does not flow into the exhaust muffler 73 due to the sealed pipe wall. The gas exhausted from the engine to the intake pipe 3 is guided to other muffler chambers through the intake section 31. The intake section 31 penetrates the side wall of the housing 1 at a position corresponding to the exhaust muffler 73 primarily to accommodate the position of the engine's intake manifold.
[0047] In one embodiment, the air intake section 31 can penetrate the side wall of the housing 1 at the position corresponding to the expansion anechoic chamber 71, and the air intake section 31 is arranged at intervals with the first partition 21.
[0048] In one embodiment, please refer to Figure 3 , Figure 4 and Figure 6 The intake pipe 3 also includes a first muffler section 32, which is connected to the intake section 31. The first muffler section 32 is at least partially located within the expansion muffler chamber 71. The pipe wall of the first muffler section 32 has a first muffler hole 321 that communicates with the expansion muffler chamber 71. The first muffler hole 321 is located within the expansion muffler chamber 71. With this structure, the exhaust gas from the engine is guided through the intake section 31 to the first muffler section 32, and then flows through the first muffler hole 321 of the first muffler section 32 to the expansion muffler chamber 71 for noise reduction. The first muffler hole 321 serves two purposes: firstly, it connects to the expansion muffler chamber 71, and secondly, it reduces the noise of the flowing gas.
[0049] In one embodiment, please refer to Figure 3 , Figure 4 and Figure 6 The chamber partition between the expansion anechoic chamber 71 and the Helmholtz anechoic chamber 72 is a second partition 22.
[0050] In one embodiment, please refer to Figure 3 , Figure 4 and Figure 6 The first silencing section 32 spans across the first partition 21 and the second partition 22, and is connected to the silencing pipe 4. With this structure, a portion of the gas in the first silencing section 32 enters the expansion silencing chamber 71 through the first silencing hole 321 for silencing, while another portion flows directly to the silencing pipe 4 and enters the Helmholtz silencing chamber 72 for silencing.
[0051] In one embodiment, please refer to Figure 4The silencer duct 4 includes a first transition section 41, a first through section 42, a second transition section 43, and a second through section 44. The first transition section 41 receives the gas flowing into the Helmholtz anechoic chamber 72 and is connected to the first silencer section 32. One end of the first through section 42 is connected to the first transition section 41 and passes through the second partition 22. One end of the second transition section 43 is connected to the other end of the first through section 42. The other end of the second transition section 43 is connected to the second through section 44, which passes through the second partition 22. The gas in the second through section 44 is discharged into the Helmholtz anechoic chamber 72. With this structure, the first transition section 41, the first through section 42, the second transition section 43, and the second through section 44 repeatedly bend and pass through the second partition 22. Within a limited space, the silencer duct 4 connecting the expansion anechoic chamber 71 and the Helmholtz anechoic chamber 72 is long enough to meet the length requirements for anechoic suppression, making the silencer structure more compact.
[0052] In one embodiment, please refer to Figure 4 The first through section 42 is located below the first transition section 41, and the second through section 44 is located below the first through section 42. With this structure, since the intake pipe 3 is connected to the first transition section 41, the structures such as the first through section 42, the second transition section 43, and the second through section 44, which are at least partially located within the expansion anechoic chamber 71, are all located below the intake pipe 3. This can minimize interference between the portion of the muffler 4 located within the expansion anechoic chamber 71 and the intake pipe 3.
[0053] In one embodiment, the wall of the silencer 4 is sealed.
[0054] In one embodiment, please refer to Figure 3 , Figure 5 and Figure 6 The muffler also includes a muffler baffle 8, which has a second muffler hole 81. The second muffler hole 81 is axially arranged along the length of the housing 1. The muffler baffle 8 is located inside the exhaust muffler chamber 73 to divide the exhaust muffler chamber 73 into two sub-chambers 731 arranged along the length of the housing. With this structure, the second muffler hole 81 of the muffler baffle 8 can further expand and muffle the gas entering the exhaust muffler chamber 73 through the exhaust passage, which is beneficial for reducing the exhaust noise of the engine under medium and high speed conditions.
[0055] In one embodiment, please refer to Figure 3 , Figure 4 and Figure 6The exhaust pipe assembly 5 includes two exhaust pipe components 51. The exhaust silencer 73 and the outside of the housing 1 are connected through the exhaust pipe components 51. One exhaust pipe component 51 passes through the silencer baffle 8, and the end of the exhaust pipe component 51 that passes through the silencer baffle 8, away from the expansion silencer 71, passes through the side wall of the housing 1. The other exhaust pipe component 51 passes through the separation baffle, and the end of the exhaust pipe component 51 that passes through the chamber baffle, away from the exhaust silencer 73, passes through the shell wall of the housing 1. With this structure, exhaust is discharged to both ends of the housing 1 along its length through the two exhaust pipe components 51, making the exhaust of the silencer more uniform at both ends of the length of the housing 1.
[0056] In one embodiment, please refer to Figure 3 and Figure 5 The exhaust pipe component 51 includes a pipe body 511 and a fiberglass sound-absorbing element 512. The exhaust muffler chamber 73 and the exterior of the housing 1 are connected through the pipe body 511, and a third sound-absorbing hole is formed on the side wall of the pipe body 511. The fiberglass sound-absorbing element 512 covers the outside of the pipe body 511 and the third sound-absorbing hole. With this structure, the gas entering the exhaust muffler chamber 73 is discharged to the exterior of the housing 1 through the pipe body 511. During the flow of the gas through the pipe body 511, the exhaust noise is absorbed by the fiberglass sound-absorbing element 512 through the third sound-absorbing hole, which can reduce the exhaust noise to a certain extent. The exhaust noise frequency of the engine is relatively high under medium and high speed conditions. The fiberglass sound-absorbing element 512 has a good noise reduction effect on the higher frequency exhaust noise, which is beneficial to reducing the exhaust noise of the engine under medium and high speed conditions.
[0057] In one embodiment, please refer to Figure 5 The pipe body 511 includes a receiving section 5112, a second silencer section 5113, and an exhaust section 5114 connected in sequence. The receiving section 5112 is partially located inside the exhaust silencer chamber 73. The exhaust section 5114 is used to receive the tailpipe connection of the gas discharged from the silencer. The diameters of the receiving section 5112 and the exhaust section 5114 are larger than the diameter of the second silencer section 5113. With this structure, the larger diameter of the receiving section 5112 is beneficial for receiving the gas discharged from the exhaust silencer chamber 73, the larger diameter of the exhaust section 5114 is beneficial for docking with the larger diameter tailpipe, and the smaller diameter of the second silencer section 5113 is beneficial for silencing and reducing noise of the gas flowing through the second silencer section 5113.
[0058] In one embodiment, the switching valve 6 can be a solenoid valve. Thus, the switching valve 6 can be switched according to the set critical speed of the engine.
[0059] In one embodiment, the switching valve 6 includes a pre-tightening device. When the force acting on the switching valve 6 is less than the pre-tightening force of the pre-tightening device, the switching valve 6 remains in a closed exhaust passage state under the action of the pre-tightening force. When the force acting on the switching valve 6 is greater than the pre-tightening force of the pre-tightening device, the switching valve 6 overcomes the pre-tightening force of the pre-tightening device and opens the exhaust passage under the pressure of the airflow. With this structure, the pre-tightening force of the pre-tightening device keeps the switching valve 6 in a normally closed state with the exhaust passage closed. At lower engine speeds or idling conditions, the exhaust pressure and volume are small, and the pressure of the gas discharged from the engine to the expansion muffler 71 is insufficient to overcome the pre-tightening force of the pre-tightening device to open the exhaust passage. The switching valve 6 remains in a closed exhaust passage state, which helps to effectively reduce engine exhaust noise. At medium to high engine speeds, the exhaust pressure and volume are large, and the pressure of the gas discharged from the engine to the expansion muffler 71 is sufficient to overcome the pre-tightening force of the pre-tightening device to open the exhaust passage. The gas in the expansion muffler 71 flows to the exhaust muffler 73 and is exhausted to the outside of the muffler through the exhaust pipe assembly 5. The switching valve 6 is used to switch the exhaust passage open or closed by the exhaust pressure of the engine.
[0060] In one embodiment, the preload device can be a torsion spring.
[0061] In one embodiment, please refer to Figures 1-3 The housing 1 includes a cylindrical body 11 and end plates 12 connected to each other. End plates 12 are provided at both ends of the cylindrical body 11. The chamber partitions and the silencer pipe 4 are located inside the cylindrical body 11. The exhaust pipe assembly 5 is located at least partially inside the cylindrical body 11. All chamber partitions are located between the two end plates 12.
[0062] The above are merely preferred embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.
Claims
1. A silencer, characterized in that, The system includes a housing, chamber partitions, an intake pipe, a muffler pipe, an exhaust pipe assembly, and a switching valve. The chamber partitions and the muffler pipe are both located within the housing. The exhaust pipe assembly is at least partially located within the housing. The intake pipe connects to the exhaust pipe of the vehicle's engine. Multiple chamber partitions are present, forming multiple mutually separated muffler chambers. These chambers are arranged sequentially along the length of the housing. At least one muffler chamber is an expansion muffler chamber connected to the intake pipe. At least one muffler chamber is a Helmholtz muffler chamber, connected to the expansion muffler chamber via the muffler pipe. At least one muffler chamber is an exhaust muffler chamber. The chamber is located downstream of the expansion silencer along the exhaust path of the silencer. The exhaust silencer is connected to the outside of the housing through the exhaust pipe assembly, which is used to silence the airflow passing through it. The silencer has an exhaust passage for connecting the expansion silencer and the exhaust silencer, which passes through the chamber partition between the expansion silencer and the exhaust silencer. The switching valve is used to open the exhaust passage to connect the exhaust silencer and the expansion silencer, or to close the exhaust passage to disconnect the exhaust silencer and the expansion silencer. When the switching valve closes the exhaust passage, the gas in the expansion silencer cannot enter the exhaust silencer. The expansion anechoic chamber is located between the exhaust anechoic chamber and the Helmholtz anechoic chamber; The chamber partition between the expansion silencing chamber and the exhaust silencing chamber is the first partition, and the switching valve is installed on the first partition. The intake pipe includes a first silencer section, which is at least partially located within the expansion silencer chamber. The pipe wall of the first silencer section has a first silencer hole that communicates with the expansion silencer chamber. The first silencer hole is located within the expansion silencer chamber. The chamber partition between the expansion anechoic chamber and the Helmholtz anechoic chamber is a second partition. The silencer pipe includes: The first transition section is used to receive the gas flowing into the Helmholtz anechoic chamber, and the first transition section is connected to the first anechoic section; A first through section, one end of which is connected to the first transition section, and the first through section penetrates the second partition; The second transition section, one end of which is connected to the other end of the first through section; The second through section, the other end of the second transition section is connected to the second through section, the second through section penetrates the second partition, and the gas in the second through section is discharged into the Helmholtz anechoic chamber.
2. The silencer according to claim 1, characterized in that, The intake pipe includes: An intake section is provided, which penetrates the side wall of the housing at a position corresponding to the exhaust silencer. The intake section is partially located inside the exhaust silencer. One end of the intake section facing the expansion silencer passes through the first partition. The pipe wall of the intake section is closed. The first silencer section is connected to the air intake section.
3. The silencer according to claim 2, characterized in that, The first silencing section spans the first partition and the second partition, and the first silencing section is connected to the silencing pipe.
4. The silencer according to claim 3, characterized in that, The first through section is located below the first transition section, and the second through section is located below the first through section.
5. The silencer according to claim 1, characterized in that, The wall of the silencer pipe is sealed.
6. The silencer according to any one of claims 1 to 5, characterized in that, The muffler also includes a muffler baffle with a plurality of second muffler holes arranged axially along the length of the housing. The muffler baffle is located in the exhaust muffler chamber to divide the exhaust muffler chamber into two sub-chambers arranged along the length of the housing.
7. The silencer according to claim 6, characterized in that, The exhaust pipe assembly includes two exhaust pipe components. The exhaust silencer chamber and the outside of the housing are connected through the exhaust pipe components. One of the exhaust pipe components penetrates the silencer baffle, and the end of the exhaust pipe component that penetrates the silencer baffle, away from the expansion silencer chamber, penetrates the shell wall of the housing. The other exhaust pipe component penetrates the chamber partition, and the end of the exhaust pipe component that penetrates the chamber partition, away from the exhaust silencer chamber, penetrates the shell wall of the housing.
8. The silencer according to claim 7, characterized in that, Exhaust pipe components include: The exhaust silencer chamber and the outside of the shell are connected through the pipe body, and a third silencer hole is formed on the side wall of the pipe body; A glass fiber sound-absorbing element is wrapped around the outside of the tube body, and the glass fiber sound-absorbing element covers the third sound-absorbing hole.
9. The silencer according to claim 8, characterized in that, The pipe body includes a receiving section, a second silencer section, and an exhaust section connected in sequence. The receiving section is partially located in the exhaust silencer chamber, and the exhaust section is used to connect to the tailpipe that receives the gas discharged from the silencer. The diameters of the receiving section and the exhaust section are larger than the diameter of the second silencer section.