Silencer device for eliminating low-frequency noise of exhaust device
By integrating an L-shaped tube and a resonant cavity into the muffler device, and combining S-shaped and U-shaped exhaust pipes, the airflow path is optimized, solving the low-frequency noise problem caused by the small size of the central muffler in hybrid vehicles, and achieving effective elimination of low-frequency noise and improvement of acoustic performance.
Patent Information
- Application Number
- CN202520164772.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-24
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2035-01-24
AI Technical Summary
The design of the central muffler in the exhaust system of hybrid vehicles is small or eliminated, which leads to an increase in low-frequency noise, especially at certain speeds where noise peaks occur. Existing mufflers are difficult to effectively reduce low-frequency noise under space constraints.
Design a muffler device including a muffler inlet pipe, a resonant cavity, and an outlet pipe. By integrating an L-shaped pipe and a resonant cavity connecting pipe, and combining S-shaped and U-shaped outlet pipes, the length of the resonant cavity and outlet pipe is increased. By utilizing the specific structure and orifice design of the resonant cavity, the airflow path is optimized to reduce low-frequency noise.
It effectively reduces low-frequency noise of the exhaust device, improves acoustic performance, meets legal and regulatory requirements, has a simple structure, and is widely applicable.
Smart Images
Figure CN223608623U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to exhaust device field especially, relates to silencer field, and specifically refers to a kind of silencer device for realizing exhaust device elimination low-frequency noise. BACKGROUND
[0002] With the increasingly strict domestic automobile noise regulations, the noise indicators of exhaust device are more and more stringent, but the exhaust device also needs to meet the legal requirements under the conditions of energy saving and environmental protection, lightweight, etc. In the limited space, the noise reduction elements are increased to meet the noise requirements, and the cost and material of the noise reduction device are minimized.
[0003] The hybrid vehicle type needs to arrange a large battery pack at the chassis position, which occupies a large chassis space, so that the space for arranging the silencer of the exhaust device is compressed. Therefore, the middle silencer of the exhaust device in the hybrid vehicle type is designed to be very small, or even cancelled. This brings great challenges to the acoustic design of the exhaust device: due to the small or cancelled middle silencer, the standing wave phenomenon of the exhaust device is more obvious, which will cause the low-frequency noise emitted from the tail pipe position of the exhaust device to become larger, or even appear noise peaks at a certain speed.
[0004] The exhaust device of the hybrid vehicle type has a small or cancelled middle silencer, which will cause the low-frequency noise emitted from the tail pipe position of the exhaust device to become larger, or even appear noise peaks at a certain speed.
[0005] The existing silencer needs a large enough space, and generally needs to arrange a larger silencer at the middle position of the chassis to achieve the ideal noise reduction effect. However, the space for arranging the middle silencer is occupied by the battery pack of the new energy vehicle type, so the middle silencer of the exhaust device in the hybrid vehicle type is designed to be very small, or even cancelled. In order to solve the low-frequency acoustic problem caused thereby, the rear silencer of the exhaust device needs to be redesigned. SUMMARY
[0006] The utility model aims at overcoming the above-mentioned shortcomings of the prior art, and provides a silencer device for realizing exhaust device elimination low-frequency noise, which has low noise, simple structure and wide application range.
[0007] In order to achieve the above-mentioned purpose, the silencer device for realizing exhaust device elimination low-frequency noise of the utility model is as follows:
[0008] The main feature of the implementation of the exhaust device to eliminate low-frequency noise muffler device is that the device comprises a muffler inlet pipe, a resonance cavity, a resonance cavity connecting pipe and a muffler outlet pipe, the muffler inlet pipe and the resonance cavity connecting pipe are integrated into an L-shaped pipe, the resonance cavity connecting pipe is connected with the resonance cavity, and the muffler outlet pipe is connected with the rightmost cavity of the muffler.
[0009] Preferably, the muffler outlet pipe comprises an S-shaped outlet pipe and a U-shaped outlet pipe, the S-shaped outlet pipe is connected with the resonance cavity, the U-shaped outlet pipe is connected with the resonance cavity, the muffler outlet pipe is divided into a left outlet pipe and a right outlet pipe, the S-shaped outlet pipe is the left outlet pipe and the U-shaped outlet pipe is the right outlet pipe, or the S-shaped outlet pipe is the right outlet pipe and the U-shaped outlet pipe is the left outlet pipe.
[0010] Preferably, the surface of the resonance cavity connecting pipe is provided with a plurality of small holes.
[0011] Preferably, the muffler inlet pipe is connected with an exhaust pipe, and the muffler outlet pipe is connected with an exhaust tail pipe.
[0012] The implementation of the exhaust device to eliminate low-frequency noise muffler device is adopted, and the specific resonator and long tail pipe structure are designed in the muffler at the rear of the exhaust device, so that the low-frequency noise is effectively reduced. The special resonance cavity is added in the muffler at the rear of the exhaust device, and the length of the muffler outlet pipe is lengthened through ingenious design, so that the purpose of better eliminating low-frequency noise is achieved. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 It is a top view of the embodiment one of the implementation of the exhaust device to eliminate low-frequency noise muffler device.
[0014] Figure 2 It is a sectional view of another angle A1-A1 in Figure 1
[0015] Figure 3 It is a top view of the embodiment two of the implementation of the exhaust device to eliminate low-frequency noise muffler device.
[0016] Figure 4 It is a sectional view of B-B in Figure 3
[0017] Figure 5 It is a top view of the embodiment three of the implementation of the exhaust device to eliminate low-frequency noise muffler device.
[0018] Figure 6 For the implementation of the exhaust device to eliminate low frequency noise of the muffler device of the utility model Figure 5 The cross-sectional view of C-C.
[0019] Figure 7a For the implementation of the exhaust device to eliminate low frequency noise of the muffler device of the utility model, the side sectional view of embodiment one.
[0020] Figure 7b For the implementation of the exhaust device to eliminate low frequency noise of the muffler device of the utility model, the top view of embodiment one.
[0021] Figure 7c For the implementation of the exhaust device to eliminate low frequency noise of the muffler device of the utility model, the side sectional view of embodiment two.
[0022] Figure 7d For the implementation of the exhaust device to eliminate low frequency noise of the muffler device of the utility model, the top view of embodiment two.
[0023] Reference signs:
[0024] 11 muffler inlet pipe
[0025] 12 resonant cavity
[0026] 13 resonant cavity connecting pipe
[0027] 14 S-shaped outlet pipe
[0028] 15 U-shaped outlet pipe DETAILED DESCRIPTION
[0029] In order to more clearly describe the technical content of the utility model, the following further description is made in combination with specific embodiments.
[0030] The utility model discloses the implementation of the exhaust device to eliminate low frequency noise of the muffler device, wherein including muffler inlet pipe 11, resonant cavity 12, resonant cavity connecting pipe 13 and muffler outlet pipe, muffler inlet pipe 11 with resonant cavity connecting pipe 13 integration, form L type pipe, resonant cavity connecting pipe with resonant cavity is linked together, and muffler outlet pipe with the rightmost chamber of muffler is linked together, L type pipe has many small holes, and the exhaust gas flow that flows into the muffler device passes through the small hole and exports and enters the chamber in the middle, and through the intermediate pipe, it flows to the rightmost chamber, and exports from S-shaped outlet pipe and U-shaped outlet pipe respectively.
[0031] As the preferred embodiment of the utility model, the muffler air outlet pipe includes S-shaped air outlet pipe 14 and U-shaped air outlet pipe 15, the S-shaped air outlet pipe 14 is communicated with the resonant cavity 12, the U-shaped air outlet pipe 15 is communicated with the resonant cavity 12, the muffler air outlet pipe is divided into left air outlet pipe and right air outlet pipe, the S-shaped air outlet pipe 14 is left air outlet pipe and the U-shaped air outlet pipe 15 is right air outlet pipe, or the S-shaped air outlet pipe 14 is right air outlet pipe and the U-shaped air outlet pipe 15 is left air outlet pipe.
[0032] As the preferred embodiment of the utility model, the surface of the resonant cavity connecting pipe 13 has many small holes.
[0033] As the preferred embodiment of the utility model, the muffler air inlet pipe 11 is communicated with the exhaust pipe, and the muffler air outlet pipe is communicated with the exhaust tail pipe.
[0034] In order to improve the low-frequency noise elimination effect of the muffler, the commonly used method is to prolong the pipe length of the muffler air outlet pipe, and practice has proved that it is an effective way to reduce low-frequency noise in the exhaust device. The utility model skillfully designs the left and right air outlet pipes into U-shaped and S-shaped, which effectively increases the length of the muffler air outlet pipe and makes the design more compact. By combining the above two measures to reduce low-frequency noise, the tail pipe noise of the exhaust device is effectively reduced.
[0035] The core structure of the device is the L-shaped pipe integrated by the muffler air inlet pipe and the resonant cavity connecting pipe, and the S-shaped air outlet pipe and the U-shaped air outlet pipe, and the resonant cavity connecting pipe is directly connected to the air inlet pipe.
[0036] In the specific implementation manner of the utility model, the muffler air inlet pipe 11 is directly connected to the resonant cavity 12 through the L-shaped pipe, thereby improving the noise elimination effect of the resonant cavity 12.
[0037] The length of the muffler air outlet pipe is increased by the design of the S-shaped air outlet pipe 14 and the U-shaped air outlet pipe 15, thereby effectively reducing low-frequency noise.
[0038] As shown in the figure, in order to eliminate low-frequency noise, a Helmholtz resonant cavity 12 is designed in the muffler, and the noise elimination frequency of the resonant cavity 12 is determined by the following formula, wherein f: noise elimination frequency, c: sound speed, S: resonant cavity connecting pipe 13 cross-sectional area, L: resonant cavity connecting pipe 13 pipe length, V: resonator volume.
[0039]
[0040] In order to improve the muffling effect, the muffler inlet pipe 11 and the resonant cavity connecting pipe 13 are made into one L-shaped pipe, and a plurality of small holes are punched on the L-shaped pipe to allow the exhaust gas flow to flow out of the small holes. In this way, the pressure fluctuation of the exhaust device will be directly transmitted into the resonant cavity 12, thereby improving the muffling effect of the resonant cavity 12.
[0041] Figure 1 、 Figure 3 、 Figure 5 are different cross sections of the muffler. Figure 2 、 4 In Figure 6, the resonant cavity 12 refers to a cavity space formed between the two plates and the shell, which is represented by a dashed line frame in the figure.
[0042] Figure 4 is a sectional view of B-B in Figure 3 , also showing the flow direction of the exhaust gas flow.
[0043] The U-shaped pipe in Figure 7 refers to a U-shaped exhaust pipe.
[0044] The specific implementation scheme of the embodiment can refer to the related description in the above-mentioned embodiments, which will not be repeated here.
[0045] It can be understood that the same or similar parts in the above-mentioned embodiments can be mutually referred to, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.
[0046] It should be noted that in the description of the utility model, the terms "first", "second" and the like are only used for the purpose of description, and cannot be understood as indicating or implying relative importance. In addition, in the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is at least two.
[0047] Any process or method descriptions in the flowchart or otherwise described herein can be understood as representing code modules, segments, or portions of code that include one or more executable instructions for implementing specific logic functions or steps, and the scope of the preferred embodiments of the utility model includes additional implementation in which the functions are performed in different orders, in substantially simultaneous fashion, or in reverse order, according to the functions involved, which should be understood by those skilled in the art to which the embodiments of the utility model belong.
[0048] It should be understood that each part of the present application can be realized by hardware, software, firmware or a combination thereof. In the above embodiments, a plurality of steps or methods can be realized by software or firmware stored in a memory and executed by a suitable instruction execution device. For example, if realized by hardware, and as in another embodiment, it can be realized by any one or a combination of the following technologies known in the art: discrete logic circuit with logic gate circuit for implementing logic function on data signal, application specific integrated circuit with suitable combination logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) and the like.
[0049] Those skilled in the art of the present technology can understand that all or part of the steps carried out by the above-mentioned embodiment method can be completed by a program instructing the relevant hardware, and the corresponding program can be stored in a computer readable storage medium, which includes one or a combination of the steps of the method embodiment when executed.
[0050] In addition, each functional unit in each embodiment of the present application can be integrated into one processing module, or each unit can exist physically, or two or more units can be integrated into one module. The above integrated module can be realized in the form of hardware or in the form of a software function module. If the integrated module is realized in the form of a software function module and sold or used as an independent product, it can also be stored in a computer readable storage medium.
[0051] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.
[0052] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0053] The muffler device for eliminating low-frequency noise of the exhaust device is adopted, and by designing a specific resonator and a long tail pipe structure in the muffler behind the exhaust device, the low-frequency noise is effectively reduced. The present application increases a special resonant cavity 12 in the muffler behind the exhaust device, and prolongs the length of the exhaust pipe of the muffler by ingenious design, so as to better eliminate low-frequency noise.
[0054] In this specification, the present application has been described with reference to specific embodiments thereof. It is, however, apparent that various modifications and changes can be made thereto without departing from the spirit and scope of the present application. Therefore, the specification and drawings should be considered in an illustrative, and not a restrictive, sense.
Claims
1. A muffler device for implementing elimination of low frequency noise by an exhaust device, characterized by, The device comprises a muffler air inlet pipe, a resonance cavity, a resonance cavity connecting pipe and a muffler air outlet pipe, the muffler air inlet pipe and the resonance cavity connecting pipe are integrated to form an L-shaped pipe, the resonance cavity connecting pipe is connected with the resonance cavity, and the muffler air outlet pipe is connected with the rightmost cavity of the muffler.
2. The muffler device of claim 1, wherein The muffler air outlet pipe comprises an S-shaped air outlet pipe and a U-shaped air outlet pipe, the S-shaped air outlet pipe is connected with the resonance cavity, the U-shaped air outlet pipe is connected with the resonance cavity, the muffler air outlet pipe is divided into a left air outlet pipe and a right air outlet pipe, the S-shaped air outlet pipe is the left air outlet pipe and the U-shaped air outlet pipe is the right air outlet pipe, or the S-shaped air outlet pipe is the right air outlet pipe and the U-shaped air outlet pipe is the left air outlet pipe.
3. The muffler device of claim 1, wherein The surface of the resonance cavity connecting pipe has a plurality of small holes.
4. The muffler device of claim 1, wherein The muffler air inlet pipe is connected with the exhaust pipe, and the muffler air outlet pipe is connected with the exhaust tail pipe.