CN216741783U - Air inlet system with adjustable medium-low frequency noise elimination function - Google Patents
Air inlet system with adjustable medium-low frequency noise elimination function Download PDFInfo
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Abstract
The utility model relates to an automobile air inlet system, in particular to an air inlet system capable of adjusting the middle and low frequency noise elimination function, which comprises an air inlet pipeline, an air filter and an air outlet pipeline; a filter element is arranged in the air filter, the filter element divides the air filter into two parts, one part is connected with the air inlet pipeline, and the other part is connected with the air outlet pipeline; an internal partition is disposed in at least one of the sidewalls of the air induction system to form a chamber. Compared with the prior art, the utility model has the advantages that the inner baffles are arranged in the air inlet pipeline, the air outlet pipeline and the air filter, so that the center and low frequency noise can be eliminated in a targeted manner, and the noise elimination function at the middle and low frequency positions is improved; the design is greatly simplified, and the whole air inlet system is concise and attractive in shape; the silencer has the advantages of small change to the original structure and strong adaptability to boundary conditions, can effectively improve the silencing capability, meets the requirement of vehicles on the miniaturization of air inlet systems, and can be applied to air inlet systems of various types and specifications.
Description
Technical Field
The utility model relates to an automobile air intake system, concretely relates to adjustable low and medium frequency noise elimination function's air intake system.
Background
The air intake system is one of the most main noise sources of the automobile, high-speed gas enters the cylinder through the air filter, the air inlet pipe and the air valve, and strong pneumatic noise can be generated in the flowing process. The noise is mainly noise at an air inlet, and the noise source is very close to the vehicle cabin, so that the noise contributes greatly to the noise in the vehicle and is also the most main passing noise source of the vehicle. Therefore, the provision of a muffler in the intake system is the most important means for solving the intake noise of internal combustion engine vehicles and fuel cell vehicles.
Generally, to solve the problem of high-frequency noise, mufflers are generally integrated on the air intake system, and these mufflers may be pure reactive mufflers or pure resistive mufflers, or may be impedance compound mufflers. In order to solve the problem of medium-low frequency noise, a single or a plurality of Helmholtz resonant cavities are generally integrated on an air inlet system. In general, however, the larger the sound deadening volume the better: for the expanding silencer, the larger the volume of the expanding silencer is, the wider the frequency band in which the transmission loss can be adjusted is, and the transmission loss is increased; the larger the volume for the Helmholtz resonator, the lower the adjustable frequency. For four-cylinder or six-cylinder engines, the volume requirement of the silencing element is usually 10-15L, but for vehicles, the air intake system is arranged under the front cover, and a plurality of gas components are arranged beside the air intake system, so that the large space for installing the silencing element is difficult to ensure.
Chinese patent with publication number CN102644531A discloses a resonance device for engine air intake system, it includes casing and grafting part, the inside structure that is the cavity of casing, first end at the casing is provided with the opening, grafting part can insert the cavity of casing through the opening shape fit, the casing has first air duct, grafting part includes the second air duct, the second air duct has first end and second end, first curb plate is close to the first end in second air duct, first curb plate can seal the opening of covering, and first air duct or air guide hole and second air duct form the admission line that is used for gaseous inflow or outflow jointly. In this patent, the cavity inside the housing is divided into a plurality of resonance chambers for canceling out noises of different frequency bands, the structure is complicated, and it requires a large space for satisfying the noise cancellation effect. Further, chinese patents CN103629024A, CN103742319A, CN206206032U, CN105422337A, CN207131511U, and CN105020071A, each disclose various mufflers provided in an intake system of an engine and intake systems having a specific muffling capability. However, these mufflers or air intake systems, without exception, are complex in structure and occupy a large space.
Chinese patents CN204327344U and CN206236422U attempt to reduce the space occupied by the muffler by using some special designs, but the structure is more complicated and the reduced space is limited.
In chinese patent publication No. CN206175114U, two layers of perforated plates are provided at the bottom of the air cleaner to adjust the muffling frequency of the air intake system, but the adjustment space of the structure is small, and low-frequency noise cannot be eliminated.
Therefore, the design of the air inlet system which can effectively adjust the medium-low frequency noise elimination function, has a simple structure and occupies a small volume becomes an urgent requirement for the development of the automobile industry.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving at least one of the above problems and providing an air intake system with adjustable medium-low frequency noise elimination function, which has the advantages of small occupied space, simple structure and effective promotion of noise elimination capability.
The purpose of the utility model is realized through the following technical scheme:
an air inlet system capable of adjusting the medium-low frequency noise elimination function comprises an air inlet pipeline, an air filter and an air outlet pipeline;
the air filter is internally provided with a filter element, the filter element divides the air filter into two parts, one part is connected with the air inlet pipeline, and the other part is connected with the air outlet pipeline; the air entering the air inlet system passes through the filter element through the air inlet pipeline and then leaves the air inlet system through the air outlet pipeline, and filtering is finished.
The air inlet system is provided with an inner partition plate on at least one side wall to form a chamber.
That is, the chamber may be provided only on a side wall of one of the air inlet pipeline, the air cleaner or the air outlet pipeline, only on side walls of the air inlet pipeline and the air cleaner, or on side walls of the air inlet pipeline and the air outlet pipeline, or on side walls of the air cleaner, the air outlet pipeline, or on side walls of all the three. And may be provided on only a portion of the side walls, such as only the upper side walls or only the lower side walls or all of them with chambers or the like.
In addition, when the air inlet pipeline or the air outlet pipeline is provided with the chamber, the chamber can extend from one end to the other end, or can be arranged at the end or the middle part without exceeding the length of the chamber, or a plurality of chambers are arranged at intervals; when the chamber is arranged in the air filter, the chamber can extend from one end to the other end, or can be arranged on the upper part of the side wall, or a plurality of chambers are arranged at intervals.
Preferably, the inner partition comprises an air inlet pipeline inner wall arranged in the air inlet pipeline, an air filter inner partition arranged in the air filter and an air outlet pipeline inner wall arranged in the air outlet pipeline.
Preferably, the length of the cavity on the air inlet pipeline is less than or equal to the length of the air inlet pipeline; the length of the cavity on the air outlet pipeline is less than or equal to that of the air outlet pipeline. The depth of the chamber can be set according to the requirements of different sound attenuation frequencies.
Preferably, the inner partition has an open pore structure, and the open pore structure is one or more of a slit structure, a micro-perforated structure and a perforated structure. And selecting and combining structures and parameters according to the frequency needing noise elimination.
Preferably, the slit structure is rectangular and/or rhombic.
Preferably, the perforated structure is one or more of a circle, an ellipse, a triangle and a polygon.
Preferably, the open pore structure is provided with at least one open pore.
That is, the inner partition may have a mixed opening structure, and each opening structure may have a different opening shape.
Preferably, the inner partition plate is a resonator plate, and a chamber formed by the resonator plate and the side wall is of a closed structure.
Preferably, the resonance plate is a smooth-surface thin plate or a reinforcing rib plate.
Preferably, the inner partition walls of the inlet and outlet pipes may be of uniform opening pattern according to the noise frequency to be eliminated.
Preferably, the inner partition plate is connected with the side wall in a clamping or welding mode.
Preferably, the air intake system is preferably made of plastic and can be formed by blow molding or injection molding.
When the device works, air enters from the air inlet pipeline, is filtered by the filter element arranged in the air filter and then enters other systems from the air outlet pipeline. And the noise enters the air inlet system from an air outlet pipeline of the air inlet system, passes through the air filter and the air inlet pipeline and is transmitted to the outside. The medium and low frequency noise is eliminated by resonance of a chamber arranged in the air intake system. Air inlet system's air inlet pipeline inner wall, gas outlet pipeline inner wall to and the different structures of baffle in the air cleaner, have different noise elimination functions, the concrete computational formula of the structure that uses in this embodiment is as follows:
when the slit structure is adopted:
in the slit structure, an air column in the slit is equivalent to mass, a back cavity is equivalent to a spring, a vibration system is formed by the air column and the back cavity, and when the frequency of incident sound waves is close to the natural frequency of the vibration system, resonance occurs to absorb the peak value of the sound waves. Main silencing frequency f of slit structure0Comprises the following steps:
in the formula: c-speed of sound (m/s); p-slit perforation (%); t-the thickness (m) of the plate; air layer behind L-shaped partition plate or perforated pipeA thickness (m); le-end of plate thickness correction (m). Wherein leCan be obtained by the following formula:
in the formula: b-slit width (m); b-slit length (m).
Main silencing frequency f of slit structure0The main noise elimination frequency can be calculated through a formula, but parameters in practical application are often difficult to determine, and the accurate main noise elimination frequency can be obtained through simulation.
For an air inlet system with medium-low frequency noise elimination capability, the perforation rate P of the slit structure is less than or equal to 0.15, the plate thickness t is less than or equal to 5mm, the thickness L of an air layer behind the partition plate or the perforated pipe is greater than or equal to 20mm, the slit width B is 1-20mm, and the slit length B is greater than 5 times of the slit width B.
When a micro-perforated structure is adopted:
the micro-perforated structure is a combination of vibrating systems, the air column in the micro-perforations is equivalent to mass, and the back cavity is equivalent to a spring. The difference is that the sound resistance is large and the sound quality is small because the through holes are fine and dense, so that the sound absorption function of broadband is realized. Main silencing frequency f of micro-perforated structure0Comprises the following steps:
in the formula: c-speed of sound (m/s); p-microperforation plate perforation (%); t-the thickness (m) of the plate; l-spacer or perforated tube back air layer thickness (m).
Main silencing frequency f of micro-perforated structure0The main silencing frequency can be calculated through a formula, but parameters in practical application are often difficult to determine, and the accurate main silencing frequency can be obtained through simulation.
For an air inlet system with medium-low frequency noise elimination capability, the perforation rate P of the micro-perforation structure is less than or equal to 0.025, the plate thickness is less than 1mm, the micro-perforation aperture is less than 1mm, and the thickness L of an air layer behind the partition plate or the perforated pipe is more than or equal to 20 mm.
When a perforation structure is adopted:
the perforated structure is a single Helmholtz vibration system or a combination of vibration systems, the column of air in the perforations corresponds to the mass and the back cavity corresponds to the spring. The perforation structure is mainly used for reducing intermediate frequency noise and main noise elimination frequency f0Comprises the following steps:
in the formula: c-speed of sound (m/s); p-perforated plate perforation (%); t-the thickness (m) of the plate; d-pore size (m); l-spacer or perforated tube back air layer thickness (m).
Main silencing frequency f of perforated structure0The main silencing frequency can be calculated through a formula, but parameters in practical application are often difficult to determine, and the accurate main silencing frequency can be obtained through simulation. According to different noise elimination frequency bands, a plurality of cavities can be divided in the air filter or on a pipeline, and the through hole structure is combined for use.
For an air inlet system with medium-low frequency noise elimination capability, the perforation rate P of the perforation structure is less than or equal to 0.15, the plate thickness t is less than or equal to 5mm, the aperture d is greater than or equal to 1mm, and the thickness L of an air layer behind the partition plate or the perforated pipe is greater than or equal to 20 mm.
When a sounding board is adopted:
the resonance plate is a resonance system formed by the elasticity of the plate, the elasticity of the air layer behind the plate and the mass of the plate, and has a large noise elimination function near the resonance frequency of the system. Main damping frequency f of the resonator plate0Comprises the following steps:
in the formula: c-speed of sound (m/s); rho-air Density (kg/m)3)；M0Weight per unit area of the resonator plate (kg/m)2) (ii) a L-spacer back air layer thickness (m).
Main silencing frequency of the resonance platef0The noise elimination frequency can be calculated through a formula, and the accurate noise elimination frequency can be obtained through simulation in practical application.
For an air inlet system with medium-low frequency silencing capability, the unit area weight M of the resonance plate0≥0.2kg/m2And the thickness L of the air layer behind the clapboard is more than or equal to 20 mm.
The utility model discloses a theory of operation does:
when the device works, air enters from the air inlet pipeline, is filtered by the filter element arranged in the air filter, leaves the air inlet system from the air outlet pipeline and enters other systems. And the noise enters the air inlet system from an air outlet pipeline of the air inlet system, passes through the air filter and the air inlet pipeline and is transmitted to the outside. The medium and low frequency noise is eliminated by resonance of a chamber arranged in the air intake system. Different silencing functions can be achieved according to different structures of an air inlet pipeline and an air outlet pipeline of the air inlet system and an inner partition plate arranged in the air filter.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. although the traditional air inlet system of the expansion chamber can eliminate noise to a certain extent, the traditional air inlet system cannot eliminate noise at certain intermediate frequency positions due to the existence of a pipeline mode and a system mode, and even can amplify the noise. The utility model discloses a set up the inner separator in air inlet pipeline and gas outlet pipeline and air cleaner, can play the pertinence noise elimination to the centering low frequency noise, promote the noise elimination function of low and medium frequency department.
2. The traditional silencer can set various Helmholtz resonant cavities on an air inlet pipeline or an air outlet pipeline for reducing the low-medium frequency noise, and the structure is complex. The utility model discloses a form the cavity in pipeline and air cleaner, simplified the design greatly, make whole air intake system shape succinct, pleasing to the eye simultaneously to it is little to account for the space utilization inside the car, effectively improves.
3. The traditional silencer needs a large silencing volume, the lower the frequency is, the larger the volume is, the higher the requirement on the boundary is, and the traditional silencer is not beneficial to production and installation. The utility model discloses advance in the baffle can realize the middle and low frequency noise elimination in pipeline and air cleaner internally mounted, little to the original structural change, to the strong adaptability of boundary condition, when effectively promoting noise elimination ability, satisfy the vehicle to the miniaturized requirement of air intake system to can be applied to in the air intake system of multiple different model specifications, be suitable for the practicality.
Drawings
Fig. 1 is a schematic configuration diagram of an intake system of embodiment 1;
FIG. 2 is a schematic configuration diagram of an intake system of embodiment 2;
FIG. 3 is a schematic configuration diagram of an intake system of embodiment 3;
fig. 4 is a schematic structural view of an inner partition plate using a slit structure in example 1 and example 2;
FIG. 5 is a schematic view of the inner separator using a microperforated structure according to example 1;
FIG. 6 is a schematic structural view of an inner partition plate using a perforated structure in examples 2 and 3;
FIG. 7 is a schematic view showing the structure of an inner partition plate using a smooth-faced thin plate (resonator plate) in example 1;
FIG. 8 is a schematic structural view of an inner diaphragm using a gusset (resonator plate) in example 2;
FIG. 9 is a schematic view showing a transfer loss curve of an intake system equipped with the intake system of embodiment 1 and an intake system not equipped with a muffler;
in the figure: 1-gas inlet line; 11-the inner wall of the gas inlet pipeline and 12-the outer wall of the gas inlet pipeline; 2-an air filter; 21-an air filter inner partition plate; 22-air cleaner housing; 3-a filter element; 4-air outlet pipeline; 41-inner wall of air outlet pipeline; 42-outer wall of the air outlet pipeline.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Example 1
An air inlet system capable of adjusting the medium-low frequency noise elimination function is shown in figure 1 and comprises an air inlet pipeline 1, an air filter 2 and an air outlet pipeline 4; a filter element 3 is arranged in the air filter 2, the filter element 3 divides the air filter 2 into two parts, one part is connected with the air inlet pipeline 1, and the other part is connected with the air outlet pipeline 4; the air intake system is provided with an inner partition forming a chamber on at least one of the side walls.
More specifically, in the present embodiment:
the internal baffle comprises an air inlet pipeline inner wall 11 arranged in the air inlet pipeline 1, an air filter internal baffle 21 arranged in the air filter 2 and an air outlet pipeline inner wall 41 arranged in the air outlet pipeline 4.
An air inlet pipeline inner wall 11 (inner partition plate) is welded in the air inlet pipeline 1, and then a cavity is formed together with an air inlet pipeline outer wall 12, the cavity is arranged in an up-and-down symmetrical mode, and the length of the cavity is consistent with that of the air inlet pipeline 1, so that low-frequency noise is eliminated. The inner wall 11 of the inlet pipe is also provided with a slit structure, wherein the slit structure is provided with a rectangular gap in the center of the area, as shown in fig. 4.
The outlet pipeline 4 is substantially the same as the inlet pipeline 1, and has an outlet pipeline inner wall 41 (inner partition plate) welded therein to form a chamber together with the outlet pipeline outer wall 42, except that the outlet pipeline inner wall 41 adopts a micro-perforated structure, and the micro-perforated structure is provided with 3 × 10 micropores uniformly distributed in the region, as shown in fig. 5 (all micropores are not fully shown in the drawing, only schematic).
The air filter 2 is internally clamped with an air filter inner partition 21, so that a chamber is formed together with an air filter shell 22, the chamber is the same as the air inlet pipeline 1 and the air outlet pipeline 4, and the air filter inner partition 21 is respectively arranged on the upper side and the lower side (the two sides of the filter element 3), so that an upper chamber and a lower chamber are formed inside the air filter 2 (the upper chamber and the lower chamber are extended to the other side wall by one side wall of the air filter 2). The air filter inner partition 21 is a resonator plate, and the upper and lower air filter inner partitions 21 are both smooth thin plates (as shown in fig. 7).
In this embodiment, the entire intake system is made of plastic, and may be formed by blow molding or injection molding.
When the device works, air enters from the air inlet pipeline 1, is filtered by the filter element 3 arranged in the air filter 2, and then enters other systems from the air outlet pipeline 4. And the noise enters the air inlet system from an air outlet pipeline 4 of the air inlet system, passes through the air filter 2 and the air inlet pipeline 1 and is transmitted to the outside. The medium and low frequency noise is eliminated by resonance of a chamber arranged in the air intake system. The different structures of the air inlet pipeline inner wall 11, the air outlet pipeline inner wall 41 and the partition plate 21 in the air filter of the air inlet system have different noise elimination functions, and the specific calculation formula of the structure used in the embodiment is as follows:
when the slit structure is adopted:
in the slit structure, an air column in the slit is equivalent to mass, a back cavity is equivalent to a spring, a vibration system is formed by the air column and the back cavity, and when the frequency of incident sound waves is close to the natural frequency of the vibration system, resonance occurs to absorb the peak value of the sound waves. Main silencing frequency f of slit structure0Comprises the following steps:
in the formula: c-speed of sound (m/s); p-slit perforation (%); t-the thickness (m) of the plate; l-the thickness (m) of the air layer behind the baffle or perforated pipe; l. thee-end of plate thickness correction (m). Wherein leCan be obtained by the following formula:
in the formula: b-slit width (m); b-slit length (m).
Main silencing frequency f of slit structure0The main silencing frequency can be calculated through a formula, but parameters in practical application are often difficult to determine, and the accurate main silencing frequency can be obtained through simulation.
For an air inlet system with medium-low frequency noise elimination capability, the perforation rate P of the slit structure is less than or equal to 0.15, the plate thickness t is less than or equal to 5mm, the thickness L of an air layer behind the partition plate or the perforated pipe is greater than or equal to 20mm, the slit width B is 1-20mm, and the slit length B is greater than 5 times of the slit width B.
When a micro-perforated structure is adopted:
the micro-perforated structure is a combination of vibrating systems, the air column in the micro-perforations is equivalent to mass, and the back cavity is equivalent to a spring. The difference is that the sound resistance is large and the sound quality is small because the through holes are fine and dense, so that the sound absorption function of broadband is realized. Main silencing frequency f of micro-perforated structure0Comprises the following steps:
in the formula: c-speed of sound (m/s); p-microperforation plate perforation (%); t-the thickness (m) of the plate; l-spacer or perforated tube back air layer thickness (m).
Main silencing frequency f of micro-perforated structure0The main silencing frequency can be calculated through a formula, but parameters in practical application are often difficult to determine, and the accurate main silencing frequency can be obtained through simulation.
For an air inlet system with medium-low frequency noise elimination capability, the perforation rate P of the micro-perforation structure is less than or equal to 0.025, the plate thickness is less than 1mm, the micro-perforation aperture is less than 1mm, and the thickness L of an air layer behind the partition plate or the perforated pipe is more than or equal to 20 mm.
When the sounding board is adopted:
the resonance plate is a resonance system formed by the elasticity of the plate, the elasticity of the air layer behind the plate and the mass of the plate, and has a large noise elimination function near the resonance frequency of the system. Main damping frequency f of the resonator plate0Comprises the following steps:
in the formula: c-speed of sound (m/s); rho-air Density (kg/m)3)；M0Weight per unit area of the resonator plate (kg/m)2) (ii) a L-spacer back air layer thickness (m).
Main damping frequency f of the resonator plate0Can be obtained by formula calculation and is practically appliedAnd more accurate silencing frequency can be obtained through simulation.
For an air inlet system with medium-low frequency silencing capability, the unit area weight M of the resonance plate0≥0.2kg/m2And the thickness L of the air layer behind the clapboard is more than or equal to 20 mm.
The specific parameters in this embodiment are as follows: the thickness of an air layer between the inner wall and the outer wall of the air inlet pipeline 1 is 20mm, the thickness of the inner wall is 2.5mm, a slit with the length of 50mm and the width of 2mm is formed in the inner wall, and the perforation rate is 0.05; the thickness of the air layer between the inner wall and the outer wall of the air outlet pipeline 4 is 30mm, and the thickness of the inner wall is 0.5 mm. The aperture of the micro-perforation is 0.5mm, and the perforation rate is 0.025; the thickness of the inner baffle of the air filter 2 is 2.5mm, the thickness of the air layer behind the baffle is 40mm and 60mm respectively, and the weight per unit area is 0.35kg/m2。
As shown in fig. 9, in order to obtain the transmission loss curve according to the parameter simulation in the present embodiment, it can be seen from the graph that the sound attenuation structure has a significant sound attenuation capability at a low frequency and performs well at most frequencies, which indicates that the sound attenuation structure designed in the present embodiment has a good sound attenuation effect at a low frequency and has a certain effect at other frequencies.
The utility model discloses a theory of operation does:
when the device works, air enters from the air inlet pipeline 1, is filtered by the filter element 3 arranged in the air filter 2, leaves the air inlet system from the air outlet pipeline 4 and enters other systems. And the noise enters the air inlet system from an air outlet pipeline 4 of the air inlet system, passes through the air filter 2 and the air inlet pipeline 1 and is transmitted to the outside. The medium and low frequency noise is eliminated by resonance of a chamber arranged in the air intake system. Different silencing functions can be achieved according to different structures of an air inlet pipeline 1 and an air outlet pipeline 4 of the air inlet system and inner partition plates arranged in the air filter 2.
Example 2
An air intake system capable of adjusting the medium-low frequency noise elimination function is shown in figure 2 and comprises an air inlet pipeline 1, an air filter 2 and an air outlet pipeline 4; a filter element 3 is arranged in the air filter 2, the filter element 3 divides the air filter 2 into two parts, one part is connected with the air inlet pipeline 1, and the other part is connected with the air outlet pipeline 4; the air intake system is provided with an inner partition forming a chamber on at least one of the side walls.
More specifically, in the present embodiment:
the internal baffle comprises an air inlet pipeline inner wall 11 arranged in the air inlet pipeline 1, an air filter internal baffle 21 arranged in the air filter 2 and an air outlet pipeline inner wall 41 arranged in the air outlet pipeline 4.
The inner wall 11 (inner partition) of the air inlet pipeline is clamped in the air inlet pipeline 1, and then a cavity is formed together with the outer wall 12 of the air inlet pipeline, the cavity is arranged in an up-and-down symmetrical mode, and the length of the cavity is slightly shorter than that of the air inlet pipeline 1, so that low-frequency noise is eliminated. The inner wall 11 of the air inlet pipeline is also provided with an opening, the air inlet to the air filter 2 can be divided into two areas, and a slit structure and a perforation structure are sequentially arranged, wherein the slit structure is provided with a rectangular notch in the center of the area, as shown in figure 4; the perforation structures are uniformly distributed in the form of four large circular holes as shown in fig. 6.
The air outlet pipeline 4 is the same as the air inlet pipeline 1, an air outlet pipeline inner wall 41 (inner partition plate) is clamped inside the air outlet pipeline 4, a chamber is further formed together with an air outlet pipeline outer wall 42, and all parameters and properties of the air outlet pipeline inner wall 41 are completely consistent with those of the air inlet pipeline inner wall 11.
An air filter inner partition 21 is clamped inside the air filter 2, and then forms a chamber together with the air filter shell 22, in this embodiment, only one air filter inner partition 21 is arranged on the upper side (the side connected with the air outlet pipeline 4), a chamber is formed inside the air filter 2, and the chamber extends from one side wall of the air filter 2 to the other side wall. The air cleaner inner partition 21 is a resonance plate, and the air cleaner inner partition 21 is a reinforcing rib plate (as shown in fig. 8).
In this embodiment, the whole air intake system is made of plastic, and can be formed by a blow molding or injection molding method.
When the device works, air enters from the air inlet pipeline 1, is filtered by the filter element 3 arranged in the air filter 2 and then enters other systems from the air outlet pipeline 4. And the noise enters the air inlet system from an air outlet pipeline 4 of the air inlet system, passes through the air filter 2 and the air inlet pipeline 1 and is transmitted to the outside. The medium and low frequency noise is eliminated by resonance of a chamber arranged in the air intake system. The different structures of the air inlet pipeline inner wall 11, the air outlet pipeline inner wall 41 and the partition plate 21 in the air filter of the air inlet system have different noise elimination functions, and the specific calculation formula of the structure used in the embodiment is as follows:
when the slit structure is adopted:
in the slit structure, an air column in the slit is equivalent to mass, a back cavity is equivalent to a spring, a vibration system is formed by the air column and the back cavity, and when the frequency of incident sound waves is close to the natural frequency of the vibration system, resonance occurs to absorb the peak value of the sound waves. Main silencing frequency f of slit structure0Comprises the following steps:
in the formula: c-speed of sound (m/s); p-slit perforation (%); t-the thickness (m) of the plate; l-the thickness (m) of the air layer behind the baffle or perforated pipe; l. thee-end of plate thickness correction (m). Wherein leCan be obtained by the following formula:
in the formula: b-slit width (m); b-slit length (m).
Main silencing frequency f of slit structure0The main silencing frequency can be calculated through a formula, but parameters in practical application are often difficult to determine, and the accurate main silencing frequency can be obtained through simulation.
For an air inlet system with medium-low frequency noise elimination capability, the perforation rate P of the slit structure is less than or equal to 0.15, the plate thickness t is less than or equal to 5mm, the thickness L of an air layer behind the partition plate or the perforated pipe is greater than or equal to 20mm, the slit width B is 1-20mm, and the slit length B is greater than 5 times of the slit width B.
When the perforation structure is adopted:
the perforated structure being a single Helmholtz vibrating system or vibrating systemIn combination, the column of air in the perforation acts as a mass and the back cavity acts as a spring. The perforation structure is mainly used for reducing intermediate frequency noise and main noise elimination frequency f0Comprises the following steps:
in the formula: c-speed of sound (m/s); p-perforated plate perforation (%); t-the thickness (m) of the plate; d-pore size (m); l-spacer or perforated tube back air layer thickness (m).
Main silencing frequency f of perforated structures0The main silencing frequency can be calculated through a formula, but parameters in practical application are often difficult to determine, and the accurate main silencing frequency can be obtained through simulation. According to different noise elimination frequency bands, a plurality of cavities can be divided in the air filter 2 or on a pipeline, and the through hole structures are combined for use.
For an air inlet system with medium-low frequency noise elimination capability, the perforation rate P of the perforation structure is less than or equal to 0.15, the plate thickness t is less than or equal to 5mm, the aperture d is greater than or equal to 1mm, and the thickness L of an air layer behind the partition plate or the perforated pipe is greater than or equal to 20 mm.
When a sounding board is adopted:
the resonance plate is a resonance system formed by the elasticity of the plate, the elasticity of the air layer behind the plate and the mass of the plate, and has a large noise elimination function near the resonance frequency of the system. Main damping frequency f of the resonator plate0Comprises the following steps:
in the formula: c-speed of sound (m/s); rho-air Density (kg/m)3)；M0Weight per unit area of the resonator plate (kg/m)2) (ii) a L-spacer back air layer thickness (m).
Main damping frequency f of the resonator plate0The noise elimination frequency can be calculated through a formula, and the accurate noise elimination frequency can be obtained through simulation in practical application.
For an air inlet system with medium-low frequency silencing capability, the unit area weight M of the resonance plate0≥0.2kg/m2Partition boardThe thickness L of the rear air layer is more than or equal to 20 mm.
In this embodiment, the specific parameters are as follows: the slit structure and the perforation structure of the air inlet pipeline 1 are divided into two halves, wherein the thickness of an air layer between the inner wall and the outer wall of the slit structure part is 20mm, the thickness of the inner wall is 2.5mm, a slit with the length of 50mm and the width of 2mm is formed on the inner wall, and the perforation rate is 0.1; the thickness of an air layer between the inner wall and the outer wall of the perforating structure part of the air inlet pipeline 1 is 20mm, the thickness of the inner wall is 2.5mm, the aperture is 10mm, and the perforating rate is 0.15; the arrangement of the air outlet pipeline 4 is the same as that of the air inlet pipeline 1; the weight per unit area of a reinforcing rib plate (an air cleaner internal partition plate 21) provided in the air cleaner 2 was 0.4kg/m2And the thickness of the air layer is 60 mm.
The utility model discloses a theory of operation does:
when the device works, air enters from the air inlet pipeline 1, is filtered by the filter element 3 arranged in the air filter 2, leaves the air inlet system from the air outlet pipeline 4 and enters other systems. And the noise enters the air inlet system from an air outlet pipeline 4 of the air inlet system, passes through the air filter 2 and the air inlet pipeline 1 and is transmitted to the outside. The medium and low frequency noise is eliminated by resonance of a chamber arranged in the air intake system. Different silencing functions can be achieved according to different structures of an air inlet pipeline 1 and an air outlet pipeline 4 of the air inlet system and inner partition plates arranged in the air filter 2.
Example 3
An air intake system capable of adjusting the medium-low frequency noise elimination function is shown in fig. 3 and comprises an air inlet pipeline 1, an air filter 2 and an air outlet pipeline 4; a filter element 3 is arranged in the air filter 2, the filter element 3 divides the air filter 2 into two parts, one part is connected with the air inlet pipeline 1, and the other part is connected with the air outlet pipeline 4; the air intake system is provided with an inner partition forming a chamber on at least one of the side walls.
More specifically, in the present embodiment:
the inner partition is provided only in the air cleaner 2, and the air cleaner inner partition 21 is provided only on the outlet pipe 4 side of the filter element 3, and the inner partitions are not provided in the inlet pipe 1 and the outlet pipe 4.
The inner air filter partition 21 is of a perforated structure, as shown in fig. 6, the perforated structure of the present embodiment is of six circles and is uniformly distributed on the inner air filter partition 21, and the perforated rate is 0.12, the plate thickness is 3mm, the hole diameter is 6mm, and the air layer thickness is 60 mm.
In this embodiment, the entire intake system is made of plastic, and may be formed by blow molding or injection molding.
When the device works, air enters from the air inlet pipeline 1, is filtered by the filter element 3 arranged in the air filter 2 and then enters other systems from the air outlet pipeline 4. And the noise enters the air inlet system from an air outlet pipeline 4 of the air inlet system, passes through the air filter 2 and the air inlet pipeline 1 and is transmitted to the outside. The medium and low frequency noise is eliminated by resonance of a chamber arranged in the air intake system. The different structures of the air inlet pipeline inner wall 11, the air outlet pipeline inner wall 41 and the partition plate 21 in the air filter of the air inlet system have different noise elimination functions, and the specific calculation formula of the structure used in the embodiment is as follows:
when the perforation structure is adopted:
the perforated structure is a single Helmholtz vibration system or a combination of vibration systems, the column of air in the perforations corresponds to the mass and the back cavity corresponds to the spring. The perforation structure is mainly used for reducing intermediate frequency noise and main noise elimination frequency f0Comprises the following steps:
in the formula: c-speed of sound (m/s); p-perforated plate perforation (%); t-the thickness (m) of the plate; d-pore size (m); l-spacer or perforated tube back air layer thickness (m).
Main silencing frequency f of perforated structure0The main silencing frequency can be calculated through a formula, but parameters in practical application are often difficult to determine, and the accurate main silencing frequency can be obtained through simulation. According to different noise elimination frequency bands, a plurality of chambers can be divided in the air filter 2 or on a pipeline, and the perforated structure is combined for use.
For an air inlet system with medium-low frequency noise elimination capability, the perforation rate P of the perforation structure is less than or equal to 0.15, the plate thickness t is less than or equal to 5mm, the aperture d is greater than or equal to 1mm, and the thickness L of an air layer behind the partition plate or the perforated pipe is greater than or equal to 20 mm.
The utility model discloses a theory of operation does:
when the device works, air enters from the air inlet pipeline 1, is filtered by the filter element 3 arranged in the air filter 2, leaves the air inlet system from the air outlet pipeline 4 and enters other systems. And the noise enters the air inlet system from an air outlet pipeline 4 of the air inlet system, passes through the air filter 2 and the air inlet pipeline 1 and is transmitted to the outside. The medium and low frequency noise is eliminated by resonance of a chamber arranged in the air intake system. Different silencing functions can be achieved according to different structures of an air inlet pipeline 1 and an air outlet pipeline 4 of the air inlet system and inner partition plates arranged in the air filter 2.
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should understand that all the improvements and modifications made without departing from the scope of the present invention according to the disclosure of the present invention should be within the protection scope of the present invention.
Claims (10)
1. An air inlet system with an adjustable medium-low frequency noise elimination function is characterized by comprising an air inlet pipeline (1), an air filter (2) and an air outlet pipeline (4);
a filter element (3) is arranged in the air filter (2), the air filter (2) is divided into two parts by the filter element (3), one part is connected with the air inlet pipeline (1), and the other part is connected with the air outlet pipeline (4);
the air inlet system is provided with an inner partition plate on at least one side wall to form a chamber.
2. The air intake system capable of adjusting the medium-low frequency noise elimination function according to claim 1, wherein the length of the chamber on the air inlet pipeline (1) is less than or equal to the length of the air inlet pipeline (1); the length of the chamber on the air outlet pipeline (4) is less than or equal to that of the air outlet pipeline (4).
3. The intake system capable of adjusting the middle-low frequency noise elimination function according to claim 1, wherein the inner partition plate is of an open pore structure, and the open pore structure is one or more of a slit structure, a micro-perforated structure and a perforated structure.
4. The air intake system capable of adjusting the medium-low frequency noise elimination function according to claim 3, wherein the slit structure is rectangular and/or rhombic.
5. The air intake system capable of adjusting the medium-low frequency sound attenuation function according to claim 3, wherein the perforated structure is one or more of a circle, an ellipse, a triangle and a polygon.
6. The air intake system capable of adjusting the medium-low frequency sound attenuation function according to claim 3, wherein the opening structure is provided with at least one opening.
7. The air intake system with the adjustable medium-low frequency noise elimination function according to claim 1, wherein the inner partition plate is a resonance plate, and a cavity formed by the resonance plate and the side wall is of a closed structure.
8. The air intake system capable of adjusting the medium-low frequency noise elimination function according to claim 7, wherein the resonance plate is a smooth thin plate or a reinforcing rib plate.
9. The air intake system with the adjustable medium-low frequency noise elimination function according to claim 1, wherein the inner partition plate is connected with the side wall in a clamping or welding mode.
10. The air intake system with the adjustable medium-low frequency noise elimination function according to claim 1, wherein the air intake system is made of plastic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123066887.9U CN216741783U (en) | 2021-12-08 | 2021-12-08 | Air inlet system with adjustable medium-low frequency noise elimination function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123066887.9U CN216741783U (en) | 2021-12-08 | 2021-12-08 | Air inlet system with adjustable medium-low frequency noise elimination function |
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| Publication Number | Publication Date |
|---|---|
| CN216741783U true CN216741783U (en) | 2022-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123066887.9U Active CN216741783U (en) | 2021-12-08 | 2021-12-08 | Air inlet system with adjustable medium-low frequency noise elimination function |
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| Country | Link |
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| CN (1) | CN216741783U (en) |
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2021
- 2021-12-08 CN CN202123066887.9U patent/CN216741783U/en active Active
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