CN114738151B

CN114738151B - Intake pipe silencing device and engine

Info

Publication number: CN114738151B
Application number: CN202210498614.1A
Authority: CN
Inventors: 刘瑞骏; 李志强; 倪龑; 卜耀宇; 夏恒
Original assignee: FAW Jiefang Automotive Co Ltd
Current assignee: FAW Jiefang Automotive Co Ltd
Priority date: 2022-05-09
Filing date: 2022-05-09
Publication date: 2023-06-16
Anticipated expiration: 2042-05-09
Also published as: CN114738151A

Abstract

The invention belongs to the technical field of automobile engines, and discloses an air inlet pipe silencing device and an engine. The air inlet pipe silencing device comprises a silencing assembly, wherein the silencing assembly comprises a straight-through pipe and a sealing cover, one end of the straight-through pipe is communicated with an outlet of a compressor of the turbocharger, and the other end of the straight-through pipe is communicated with an inlet of an intercooler; the straight-through pipe is provided with a first sound-absorbing groove and a second sound-absorbing groove along the circumferential direction, the sealing cover is provided with a sound-absorbing inner cavity, the sealing cover is arranged on the side wall of the straight-through pipe in a surrounding mode, and the straight-through pipe is communicated with the sound-absorbing inner cavity through the first sound-absorbing groove and the second sound-absorbing groove. The air inlet pipe silencing device is simple and compact in structure and capable of eliminating noise with specific frequency in a targeted mode.

Description

Intake pipe silencing device and engine

Technical Field

The invention relates to the technical field of automobile engines, in particular to an air inlet pipe silencing device and an engine.

Background

NVH (Noise, vibration, harshness, noise, vibration and harshness) performance has now become an important indicator for evaluating automobile quality. Each large whole vehicle plant is dedicated to improving its brand value and market competitiveness by improving NVH performance of the vehicle. Meanwhile, along with the continuous importance of people on noise pollution, the regulations on automobile noise are also continuously strict. Intake system noise is also a significant source of noise for automobiles.

Air intake system noise can be generally divided into two categories, air noise and structural noise. Air noise includes pulsation noise and fluid noise. Pulsation noise is formed by pressure fluctuation caused by periodic opening and closing of the intake valve, and this noise mainly affects the low-frequency noise characteristics of the intake system. The fluid noise is high-frequency noise generated by the airflow flowing through the flow section of the air inlet valve at high speed to form vortex; because the flow section of the air inlet valve is continuously changed, the noise has frequency distribution with a certain width, and the main frequency component is above 1000 Hz.

The noise is radiated by the structure of the air inlet system, which is caused by the small rigidity characteristic of the plastic shell, and the shell vibrates under the excitation of internal pressure waves, and the air is pushed by the outer surface to generate fluctuation, so that the noise is radiated.

The existing air inlet silencing structure mainly utilizes the resonance silencing principle, and a resonant cavity is used for silencing air flow flowing through an air inlet pipeline. The resonance muffler of the intake system has a Helmholtz muffler and a quarter-wave tube. Both types of silencers are aimed at removing noise in a narrow frequency band, helmholtz silencers are typically used to remove low frequency noise, while quarter-wave tubes are used to remove high frequency noise, which must be made long if quarter-wave tubes are to be used to remove low frequency noise, but too long a pipe is difficult to install on the air intake system. Meanwhile, the Helmholtz silencer can only eliminate noise of a specific frequency and a frequency band nearby, and when noise of a plurality of frequency bandwidths needs to be eliminated, the occupied space of the Helmholtz silencer is increased; also, in an intake system, a plurality of wavelength tubes of different lengths are generally required for eliminating noise of different frequencies, resulting in an increase in space occupied by the muffler structure.

Disclosure of Invention

The invention aims to provide an air inlet pipe silencing device which is simple and compact in structure and can specifically eliminate noise with specific frequency.

To achieve the purpose, the invention adopts the following technical scheme:

the air inlet pipe silencing device comprises a silencing assembly, wherein the silencing assembly comprises a straight-through pipe and a sealing cover, one end of the straight-through pipe is communicated with an outlet of a compressor of the turbocharger, and the other end of the straight-through pipe is communicated with an inlet of an intercooler; the straight-through pipe is provided with a first sound-absorbing groove and a second sound-absorbing groove along the circumferential direction, the sealing cover is provided with a sound-absorbing inner cavity, the sealing cover is arranged on the side wall of the straight-through pipe in a surrounding mode, and the straight-through pipe is communicated with the sound-absorbing inner cavity through the first sound-absorbing groove and the second sound-absorbing groove.

Optionally, the first sound-absorbing groove and the second sound-absorbing groove are square grooves.

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

Optionally, the first sound-absorbing groove and the second sound-absorbing groove are staggered by a preset angle along the circumferential direction.

Optionally, the preset angle is 0 °, and the frequency range of noise cancellation is 1400Hz to 1500Hz.

Optionally, the preset angle is 45 °, and the frequency range for noise cancellation is 1500Hz to 1600Hz.

Optionally, the preset angle is 90 °, and the frequency range for noise cancellation is 1600Hz to 1800Hz.

Optionally, the preset angle is 180 °, and the frequency range for eliminating noise is 1800Hz to 2000Hz.

Optionally, the noise elimination subassembly is provided with a plurality ofly, and a plurality of noise elimination subassemblies end to end, and the angle of predetermining of arbitrary two noise elimination subassemblies is all different.

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

Another object of the present invention is to provide an engine including the intake pipe silencing apparatus according to any one of the above aspects.

The beneficial effects are that:

the air inlet pipe silencing device comprises a silencing assembly, the silencing assembly comprises a straight-through pipe and a sealing cover, the straight-through pipe is communicated with an air compressor outlet of a turbocharger and an intercooler inlet, a first silencing groove and a second silencing groove which are communicated with a silencing inner cavity of the sealing cover are arranged on the straight-through pipe, air flows through the first silencing groove and the second silencing groove, and reflection, interference and the like are generated by utilizing the abrupt change of acoustic impedance of sectional areas in a pipeline so as to achieve the purpose of silencing. The air inlet pipe silencing device is simple in structure, and can be provided with a shorter sealing cover length, so that the overall length is shorter, the space occupied by the overall structure is smaller, the structure is simple and compact, and noise with specific frequency can be eliminated.

Drawings

FIG. 1 is a schematic view of an intake pipe silencer according to an embodiment of the present invention;

FIG. 2 is a schematic view of a straight-through pipe according to an embodiment of the present invention;

fig. 3 is a graph showing a transmission loss of an intake pipe silencer according to an embodiment of the present invention;

FIG. 4 is a schematic view of a straight-through pipe according to another embodiment of the present invention;

fig. 5 is a graph showing a transmission loss of an intake pipe silencer according to another example of the present invention;

FIG. 6 is a schematic view of a straight-through pipe according to another embodiment of the present invention;

fig. 7 is a graph showing a transmission loss of an intake pipe silencer according to still another embodiment of the present invention;

FIG. 8 is a schematic view of a straight-through pipe according to another embodiment of the present invention;

fig. 9 is a graph showing a transmission loss of an intake pipe silencer according to still another embodiment of the present invention;

FIG. 10 is a perspective schematic view of a multiple muffler assembly provided in accordance with an embodiment of the present invention;

fig. 11 is a graph showing the transmission loss measured after a plurality of muffler assemblies are assembled according to an embodiment of the present invention.

In the figure:

100. a straight pipe; 110. an air inlet; 120. an air outlet; 131. a first sound-absorbing groove; 132. a second sound-absorbing groove;

200. and (5) sealing the cover.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

Specific embodiments of the muffler device for an air inlet pipe provided by the invention are described in detail below with reference to the accompanying drawings and examples.

Referring to fig. 1 and 2, in the present embodiment, the intake pipe silencer includes a silencing assembly, the silencing assembly includes a straight-through pipe 100 and a sealing cover 200, one end of the straight-through pipe 100 is an air inlet 110, which is communicated with a compressor outlet of a turbocharger, and the other end is an air outlet 120, which is communicated with an inlet of an intercooler; the straight-through pipe 100 is provided with a first sound-absorbing groove 131 and a second sound-absorbing groove 132 along the circumferential direction, the sealing cover 200 is provided with a sound-absorbing inner cavity, the sealing cover 200 is arranged on the side wall of the straight-through pipe 100 in a surrounding mode, and the straight-through pipe 100 is communicated with the sound-absorbing inner cavity through the first sound-absorbing groove 131 and the second sound-absorbing groove 132.

The air inlet pipe silencing device comprises a silencing assembly, the silencing assembly comprises a straight-through pipe 100 and a sealing cover 200, the straight-through pipe 100 is communicated with an air compressor outlet of a turbocharger and an intercooler inlet, a first silencing groove 131 and a second silencing groove 132 which are communicated with a silencing inner cavity of the sealing cover 200 are arranged on the straight-through pipe 100, air flows through the first silencing groove 131 and the second silencing groove 132, and phenomena such as reflection and interference are generated by utilizing the change of acoustic impedance of abrupt change of sectional areas in a pipeline so as to achieve the purpose of silencing. The air inlet pipe silencing device is simple in structure, and can be provided with a shorter sealing cover 200 length, so that the overall length is shorter, the overall occupied space is smaller, and noise with specific frequency can be eliminated.

Specifically, the first and second sound-absorbing

grooves

131 and 132 are square grooves. Further, the square groove may be provided with chamfers at four corners. The intake pipe silencing device that sets up like this can eliminate the noise of specific frequency, in order to guarantee the effect of amortization, the shape, the size of first sound-absorbing tank 131 and second sound-absorbing tank 132 are all unanimous, and are square groove, and the length direction of this square groove is the circumferencial direction of straight-through pipe 100, and its length is the circumference of straight-through pipe 100, and the width direction of square groove is the axis direction of straight-through pipe 100, and its width is 1/5 of sealed cowling 200 length, and the axial interval of two square grooves is 10 to 20 millimeters. Of course, the first and second sound-absorbing

grooves

131 and 132 of the through pipe 100 may have other shapes, and the sizes thereof may be other lengths when they are square grooves, so long as the total opening ratio of the first and second sound-absorbing

grooves

131 and 132 is not less than 20%. The total opening ratio refers to a ratio of a grooved area of the grooved first and second sound-absorbing

grooves

131 and 132 on the through pipe 100 to an area of the through pipe 100 covered by the sealing cap 200.

Specifically, the straight-through pipe 100 is made of metal, and the sealing cap 200 is made of high temperature resistant plastic. The through pipe 100 made of metal can resist high-temperature gas at the outlet of the compressor of the turbocharger and is not easy to damage; the sealing cover 200 made of the high temperature resistant plastic, which may be one of polyimide PI, polyamideimide PAI, polyphenylene sulfide PPS, polytetrafluoroethylene PTFE, is not particularly limited as long as it can withstand high temperature for a long period of time, not only can withstand high temperature gas, but also can reduce the weight of the entire intake pipe muffler.

With continued reference to fig. 2 to 9, in the present embodiment, the first sound-absorbing grooves 131 and the second sound-absorbing grooves 132 are circumferentially staggered by a predetermined angle. The preset angle only affects the frequency range of the noise to be eliminated, and the specific value is determined by the range of the noise frequency to be eliminated, which is not particularly limited in this embodiment.

In an alternative embodiment, as shown in fig. 2 and 3, the predetermined angle is 0 °, and the frequency of noise cancellation is in the range of 1400Hz to 1500Hz.

In an alternative embodiment, as shown in fig. 4 and 5, the difference from the above embodiment is that the preset angle is 45 °, where the noise cancellation frequency ranges from 1500Hz to 1600Hz.

In yet another alternative embodiment, as shown in fig. 6 and 7, the difference from the above embodiment is that the preset angle is 90 °, where the noise cancellation frequency ranges from 1600Hz to 1800Hz.

In yet another alternative embodiment, as shown in fig. 8 and 9, the difference from the above embodiment is that the preset angle is 180 °, where the noise cancellation frequency ranges from 1800Hz to 2000Hz.

As a preferred embodiment, please refer to fig. 10 and 11, the muffler assemblies are provided in plural numbers, the plural muffler assemblies are connected end to end, and the preset angles of any two muffler assemblies are different. In this embodiment, the four muffler assemblies are disposed, and the four muffler assemblies are connected end to end, and meanwhile, the through pipes 100 of the four muffler assemblies may be integrally formed and may also be welded. Specifically, the preset angles of the four silencing assemblies are 0 °, 45 °, 90 ° and 180 °, and the four straight-through pipes 100 are welded to form the air inlet pipe silencing device shown in fig. 10, so that broadband silencing effect can be achieved, noise with the frequency of more than 20dB and 900-2300 Hz in the air inlet pipe is eliminated, and silencing effect is greatly improved.

Another object of the present invention is to provide an engine comprising an intake pipe silencing apparatus according to any one of the above aspects. Preferably, the muffler components of the intake pipe muffler device are provided in plurality, the muffler components are connected end to end, and meanwhile, the through pipes 100 of the muffler components can be integrally formed or welded. Specifically, a plurality of single-band silencing assemblies are prefabricated according to silencing requirements, so that the plurality of silencing assemblies can cover broadband noise, and the plurality of silencing assemblies are welded together according to requirements to cover the noise with the frequency of more than 20dB from 900Hz to 2300Hz in an air inlet pipe, so that the noise emitted by an engine air inlet pipe is reduced, and after the engine is assembled in a whole vehicle, the driving experience of a driver can be improved, and the comfort during driving is improved.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims

1. The air inlet pipe silencing device is characterized by comprising a silencing assembly, wherein the silencing assembly comprises a straight-through pipe (100) and a sealing cover (200), one end of the straight-through pipe (100) is communicated with a compressor outlet of a turbocharger, and the other end of the straight-through pipe is communicated with an intercooler inlet; a first sound-absorbing groove (131) and a second sound-absorbing groove (132) are formed in the through pipe (100) along the circumferential direction, the sealing cover (200) is provided with a sound-absorbing inner cavity, the sealing cover (200) is arranged on the side wall of the through pipe (100) in a surrounding mode, and the through pipe (100) is communicated with the sound-absorbing inner cavity through the first sound-absorbing groove (131) and the second sound-absorbing groove (132);

the first sound-absorbing groove (131) and the second sound-absorbing groove (132) are square grooves, the length direction of each square groove is the circumferential direction of the through pipe (100), the width direction of each square groove is the axial direction of the through pipe (100), and the axial distance between the two square grooves is 10-20 mm;

the first sound-absorbing grooves (131) and the second sound-absorbing grooves (132) are staggered by a preset angle along the circumferential direction;

the noise elimination subassembly is provided with a plurality of, and is a plurality of noise elimination subassembly end to end, arbitrary two noise elimination subassembly preset the angle all different.

2. The intake pipe silencer according to claim 1, wherein the preset angle is 0 °, and the frequency of noise elimination is in the range of 1400Hz to 1500Hz.

3. The intake pipe silencer according to claim 1, wherein the preset angle is 45 °, and the frequency of noise elimination is in the range of 1500Hz to 1600Hz.

4. The intake pipe silencer according to claim 1, wherein the preset angle is 90 °, and the frequency of noise elimination is in the range of 1600Hz to 1800Hz.

5. The intake pipe silencer according to claim 1, wherein the preset angle is 180 ° and the frequency of noise elimination is in the range of 1800Hz to 2000Hz.

6. The intake pipe silencer according to any one of claims 1 to 5, wherein the through pipe (100) is made of metal, and the sealing cover (200) is made of high-temperature-resistant plastic.

7. An engine comprising the intake pipe silencing apparatus according to any one of claims 1 to 5.