CN114738151B - Intake pipe silencing device and engine - Google Patents

Abstract

The invention belongs to the technical field of automobile engines, and discloses an intake pipe muffler and an engine. The muffler for the intake pipe includes a muffler assembly, the muffler assembly includes a straight-through pipe and a sealing cover, one end of the straight-through pipe communicates with the outlet of the turbocharger compressor, and the other end communicates with the inlet of the intercooler; the straight-through pipe is circumferentially provided with The first silencing groove and the second silencing groove, the sealing cover has a silencing inner cavity, the sealing cover is arranged on the side wall of the straight-through pipe, and the straight-through pipe passes through the first silencing groove and the second silencing groove and the sound-absorbing inner cavity cavities connected. The muffler for the intake pipe has a simple and compact structure, and can specifically eliminate noise of a specific frequency.

Description

An intake pipe muffler and engine

technical field

The invention relates to the technical field of automobile engines, in particular to an intake pipe muffler and an engine.

Background technique

Now NVH (Noise, Vibration, Harshness, noise, vibration and harshness) performance has become an important indicator for evaluating the quality of automobiles. Major OEMs are committed to enhancing their brand value and market competitiveness by improving the NVH performance of vehicles. At the same time, as people pay more and more attention to noise pollution, the regulations on automobile noise are also becoming stricter. As an important noise source of automobiles, the noise of intake system has also been paid enough attention.

Intake system noise can be generally divided into two categories: air noise and structure noise. Air noise includes pulsation noise and fluid noise. The pulsation noise is formed by the pressure fluctuations caused by the periodic opening and closing of the intake valve. This part of the noise mainly affects the low-frequency noise characteristics of the intake system. Fluid noise is the high-frequency noise generated by airflow flowing through the flow section of the intake valve at high speed to form a vortex; since the flow section of the intake valve is constantly changing, this noise has a frequency distribution of a certain width, and the main frequency component is at 1000Hz above.

The structural radiation noise of the intake system is caused by the small rigidity of the plastic shell. Under the excitation of the internal pressure wave, the shell vibrates, and the outer surface pushes the air to fluctuate, thus radiating noise.

The existing intake muffler structure mainly utilizes the principle of resonance muffler, and uses a resonant cavity to muffle the airflow flowing through the intake pipeline. The resonance mufflers for the intake system are Helmtz mufflers and quarter wave tubes. The purpose of these two mufflers is to eliminate noise in a narrow frequency band. The Helmuz muffler is generally used to eliminate low-frequency noise, while the quarter-wavelength tube is used to eliminate high-frequency noise. If you want to use a quarter-wavelength If the tube is used to eliminate low-frequency noise, the wavelength tube must be made very long, but too long a tube is difficult to install on the intake system. At the same time, the Helmtz muffler can only eliminate the noise of a specific frequency and its nearby frequency bands. When it is necessary to eliminate the noise of multiple bandwidths, the space occupied by the Helmuz muffler will increase; and, in an air intake In the system, multiple wavelength tubes of different lengths are usually required to eliminate noise of different frequencies, resulting in an increase in the space occupied by the anechoic structure.

Contents of the invention

The object of the present invention is to provide an intake pipe muffler, which has a simple and compact structure and can specifically eliminate noise of a specific frequency.

For reaching this purpose, the present invention adopts following technical scheme:

The muffler for the intake pipe includes a muffler assembly, the muffler assembly includes a straight-through pipe and a sealing cover, one end of the straight-through pipe communicates with the outlet of the turbocharger compressor, and the other end communicates with the inlet of the intercooler; the straight-through pipe is circumferentially provided with The first silencing groove and the second silencing groove, the sealing cover has a silencing inner cavity, the sealing cover is arranged on the side wall of the straight-through pipe, and the straight-through pipe passes through the first silencing groove and the second silencing groove and the sound-absorbing inner cavity cavities communicate.

Optionally, both the first muffler groove and the second muffler groove are square grooves.

Optionally, the total opening ratio of the first anechoic groove and the second anechoic groove is not less than 20%.

Optionally, the first muffler groove and the second muffler groove are set at a preset angle staggered along the circumferential direction.

Optionally, the preset angle is 0°, and at this time, the frequency range of noise elimination is 1400Hz to 1500Hz.

Optionally, the preset angle is 45°, and at this time, the frequency range of noise elimination is 1500Hz to 1600Hz.

Optionally, the preset angle is 90°, and at this time, the frequency range of noise elimination is 1600Hz to 1800Hz.

Optionally, the preset angle is 180°, and at this time, the frequency range of noise elimination is 1800Hz to 2000Hz.

Optionally, there are multiple anechoic assemblies, and the multiple anechoic assemblies are connected end to end, and the preset angles of any two anechoic assemblies are different.

Optionally, the straight-through pipe is made of metal, and the sealing cover is made of high-temperature-resistant plastic.

Another object of the invention is to provide an engine, which includes the air intake pipe muffler device according to any one of the solutions above.

Beneficial effect:

The intake pipe muffler includes a muffler assembly, the muffler assembly includes a straight-through pipe and a sealing cover, and communicates with the outlet of the turbocharger compressor and the inlet of the intercooler through the straight-through pipe. The cavity is connected to the first muffler groove and the second muffler groove, and the airflow flows through the first muffler groove and the second muffler groove, using the change of the acoustic impedance of the sudden cross-sectional area in the pipeline to generate reflection, interference, etc. In order to achieve the purpose of noise reduction. The intake pipe noise reduction device has a simple structure, and can be provided with a short sealing cover length, so that the overall length is short, the overall occupied space is small, the structure is simple and compact, and the noise of a specific frequency can be eliminated.

Description of drawings

Fig. 1 is the schematic diagram of the intake pipe noise reduction device provided by the specific embodiment of the present invention;

Fig. 2 is a schematic diagram of a straight-through pipe in an example provided by the specific embodiment of the present invention;

Fig. 3 is a transmission loss diagram of the air intake pipe muffler measured in an example provided by the specific embodiment of the present invention;

Fig. 4 is a schematic diagram of a straight-through pipe in another embodiment provided by the specific embodiment of the present invention;

Fig. 5 is a transmission loss diagram of the air intake pipe muffler measured in another embodiment provided by the specific embodiment of the present invention;

Fig. 6 is a schematic diagram of a straight-through pipe in yet another embodiment provided by the specific embodiment of the present invention;

Fig. 7 is a diagram of the transmission loss of the air intake pipe muffler measured in yet another embodiment provided by the specific embodiment of the present invention;

Fig. 8 is a schematic diagram of a straight-through pipe in another embodiment provided by the specific embodiment of the present invention;

Fig. 9 is a diagram of the transmission loss of the air intake pipe muffler measured in another example provided by the specific embodiment of the present invention;

Fig. 10 is a schematic perspective view of the combined installation of multiple noise reduction components provided by the specific embodiment of the present invention;

Fig. 11 is a diagram of the transmission loss measured after the combined installation of a plurality of sound-absorbing components provided by the specific embodiment of the present invention.

In the picture:

100, straight-through pipe; 110, air inlet; 120, air outlet; 131, first anechoic groove; 132, second anechoic groove;

200, sealing cover.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.

In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this embodiment, the terms "up", "down", "right", and other orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operations, rather than indicating Or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first" and "second" are only used to distinguish in description, and have no special meaning.

Specific embodiments of the air intake pipe muffler provided by the present invention will be described in detail below in conjunction with the drawings and embodiments.

Please refer to Fig. 1 and Fig. 2, in the present embodiment, this intake pipe muffler device comprises muffler assembly, and muffler assembly comprises straight-through pipe 100 and sealing cover 200, and one end of straight-through pipe 100 is air inlet 110, and it is connected with turbocharger The outlet of the compressor compressor is connected, and the other end is an air outlet 120, which communicates with the inlet of the intercooler; the straight pipe 100 is provided with a first muffler groove 131 and a second muffler groove 132 along the circumference, and the sealing cover 200 has a muffler In the acoustic inner cavity, the sealing cover 200 is arranged on the side wall of the straight-through pipe 100 , and the straight-through pipe 100 communicates with the inner acoustic cavity through the first muffler groove 131 and the second muffler groove 132 .

The intake pipe muffler includes a muffler assembly, the muffler assembly includes a straight-through pipe 100 and a sealing cover 200, and communicates with the outlet of the turbocharger compressor and the inlet of the intercooler through the straight-through pipe 100, and the straight-through pipe 100 is provided with a sealing cover The first muffler groove 131 and the second muffler groove 132 connected to the muffler cavity of 200, the air flow flows through the first muffler groove 131 and the second muffler groove 132, and the acoustic impedance of the sudden change in cross-sectional area in the pipeline is utilized Changes, resulting in reflection, interference and other phenomena, in order to achieve the purpose of noise reduction. The muffler for the intake pipe has a simple structure, and the length of the sealing cover 200 can be set to be short, so that the overall length is short, and the space occupied overall is small, and noise of a specific frequency can be eliminated.

Specifically, both the first muffler groove 131 and the second muffler groove 132 are square grooves. Further, chamfers can be provided at the four corners of the above-mentioned square groove. The intake pipe muffler installed in this way can eliminate the noise of specific frequency. In order to ensure the effect of muffler, the shape and size of the first muffler groove 131 and the second muffler groove 132 are all the same, and they are all square grooves. The length direction of the square groove is the circumferential direction of the straight-through pipe 100, and its length is half of the circumference of the straight-through pipe 100; the width direction of the square groove is the axial direction of the straight-through pipe 100, and its width is 1/5 of the length of the sealing cover 200 , and the axial distance between the two square grooves is 10 to 20 mm. Of course, the first silencing groove 131 and the second silencing groove 132 on the above-mentioned straight pipe 100 can also be of other shapes, and when they are both square grooves, their size can also be other lengths, only need to keep the first silencing groove 131 It is sufficient that the total opening ratio of both the second muffler groove 132 and the second anechoic groove 132 is not less than 20%, which is not specifically limited in this embodiment. The total opening ratio refers to the ratio of the slotted area of the first muffler groove 131 and the second muffler groove 132 on the straight-through pipe 100 to the area of the straight-through pipe 100 covered by the sealing cover 200 .

Specifically, the straight pipe 100 is made of metal, and the sealing cover 200 is made of high temperature resistant plastic. The straight-through pipe 100 made of metal can withstand the high-temperature gas at the outlet of the turbocharger compressor, and is not easy to be damaged; the sealing cover 200 made of high-temperature-resistant plastic can not only withstand the gas at a higher temperature, but also lighten the entire The weight of the muffler for the intake pipe, the high temperature resistant plastic can be one of polyimide PI, polyamideimide PAI, polyphenylene sulfide PPS, polytetrafluoroethylene PTFE, as long as it can withstand high temperature for a long time Yes, this embodiment does not make specific limitations.

Please continue to refer to FIG. 2 to FIG. 9 , in this embodiment, the first muffler groove 131 and the second muffler groove 132 are arranged with a preset angle staggered along the circumferential direction. The preset angle only affects the frequency range of noise elimination, and the selection of its specific value is determined by the frequency range of the noise to be eliminated, which is not specifically limited in this embodiment.

In an optional embodiment, as shown in FIG. 2 and FIG. 3 , the preset angle is 0°, and at this time, the frequency range for eliminating noise is 1400 Hz to 1500 Hz.

In another optional embodiment, as shown in FIG. 4 and FIG. 5 , the difference from the above embodiment is that the preset angle is 45°, and the frequency range for noise elimination at this time is 1500 Hz to 1600 Hz.

In yet another optional embodiment, as shown in FIG. 6 and FIG. 7 , the difference from the above embodiment is that the preset angle is 90°, and the frequency range for noise elimination at this time is 1600 Hz to 1800 Hz.

In yet another optional embodiment, as shown in FIG. 8 and FIG. 9 , the difference from the above embodiment is that the preset angle is 180°, and the frequency range for noise elimination at this time is 1800 Hz to 2000 Hz.

As a preferred embodiment, please refer to FIG. 10 and FIG. 11 , there are multiple noise-damping assemblies connected end to end, and the preset angles of any two noise-damping assemblies are different. In this embodiment, there are four silencer assemblies, and the four silencer assemblies are connected end to end. Meanwhile, the straight pipes 100 of the four silencer assemblies can be integrally formed or connected by welding. Specifically, the preset angles of the four mufflers are 0°, 45°, 90°, and 180° respectively, and the four straight-through pipes 100 are welded to form the muffler for the intake pipe as shown in FIG. 10 , which can realize The wide-band noise reduction effect eliminates the noise above 20dB with a frequency of 900 to 2300Hz in the intake pipe, and the noise reduction effect is greatly improved.

Another object of the present invention is to provide an engine, which includes the noise reduction device for the intake pipe according to any one of the solutions above. Preferably, the muffler assembly of the intake pipe muffler device is provided with multiple muffler assemblies, and the muffler assemblies are connected end to end, and the straight pipes 100 of the muffler assemblies can be integrally formed or welded. Specifically, multiple single-band noise reduction components are prefabricated according to noise reduction requirements, so that multiple noise reduction components can cover broadband noise, and multiple noise reduction components are welded together according to requirements to cover the frequency in the intake pipe. The noise above 20dB from 900Hz to 2300Hz can reduce the noise emitted by the engine intake pipe. After the engine is assembled into the vehicle, it can improve the driver's driving experience and improve driving comfort.

Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. Various obvious changes, readjustments, and substitutions will occur to those skilled in the art without departing from the scope of the present invention. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (7)

1. An intake pipe muffler, characterized in that it comprises a muffler assembly, the muffler assembly includes a straight-through pipe (100) and a sealing cover (200), and one end of the straight-through pipe (100) is connected to a turbocharger compressed air The outlet of the machine is connected, and the other end is connected with the inlet of the intercooler; the straight pipe (100) is provided with a first muffler groove (131) and a second muffler groove (132) along the circumference, and the sealing cover (200 ) has a sound-absorbing inner cavity, the sealing cover (200) is surrounded on the side wall of the straight-through pipe (100), and the straight-through pipe (100) passes through the first sound-absorbing groove (131) and the second The muffler groove (132) communicates with the muffler inner cavity; Both the first muffler groove (131) and the second muffler groove (132) are square grooves, the length direction of the square groove is the circumferential direction of the straight pipe (100), and the width direction of the square groove is is the axial direction of the straight pipe (100), and the axial distance between the two square grooves is 10 to 20 mm; The first muffler groove (131) and the second muffler groove (132) are set at a preset angle staggered along the circumferential direction; There are multiple noise-damping components connected end-to-end, and the preset angles of any two noise-damping components are different. 2 . The noise reduction device for the intake pipe according to claim 1 , wherein the preset angle is 0°, and the frequency range for noise elimination at this time is 1400Hz to 1500Hz. 3 . The noise reduction device for the intake pipe according to claim 1 , wherein the preset angle is 45°, and the noise elimination frequency range is 1500 Hz to 1600 Hz at this time. 4 . 4. The noise reduction device for the intake pipe according to claim 1, wherein the preset angle is 90°, and the noise elimination frequency range is 1600Hz to 1800Hz at this time. 5 . The noise reduction device for the intake pipe according to claim 1 , wherein the preset angle is 180°, and the frequency range for eliminating noise is 1800 Hz to 2000 Hz. 6. The muffler for the intake pipe according to any one of claims 1-5, characterized in that, the straight-through pipe (100) is made of metal, and the sealing cover (200) is made of high temperature resistant plastic. 7. An engine, characterized in that it comprises the muffler for the intake pipe according to any one of claims 1-5.

Images