CN214836791U

CN214836791U - Noise reduction wavelength tube

Info

Publication number: CN214836791U
Application number: CN202121128361.6U
Authority: CN
Inventors: 林锦智; 曾锋; 翁璟; 冯水安
Original assignee: Xiamen Golden Dragon Bus Co Ltd
Current assignee: Xiamen Golden Dragon Bus Co Ltd
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2021-11-23
Anticipated expiration: 2031-05-25

Abstract

The utility model provides a wavelength tube of making an uproar falls, include: a three-way valve for externally connecting an air inlet pipeline at an inlet side and a straight pipe body arranged at an outlet side of the three-way valve; the straight pipe body is constructed into a hollow tubular structure, the three-way valve is detachably inserted and arranged at one end of the straight pipe body, and the other end of the straight pipe body is plugged through a plug structure; the plug structure is adjustably arranged at the end position of the straight pipe body to limit the sound wave path allowed to be transmitted in the pipe. The other end of the straight pipe body is provided with a plug structure capable of adjusting the plugging position, so that the sound wave path capable of being transmitted by the wave pipe can be finely adjusted and adapted to sound wave transmission, the inner length of the sound wave path can be adjusted to the optimal silencing position, and the silencing effect of different noise frequencies in the corresponding sound wave path can be tested.

Description

Noise reduction wavelength tube

Technical Field

The utility model relates to a technical field of making an uproar falls in the car particularly, relates to a wavelength tube of making an uproar falls.

Background

Now, NVH (noise, vibration and comfort) performance becomes an important index for evaluating automobile quality, and various large automobile factories aim to improve brand value and market competitiveness of automobiles by improving NVH performance of the automobiles. Intake noise has also received sufficient attention as an important source of noise in automobiles, particularly diesel-powered engines, where the effect on intake noise due to the presence of a turbocharger is significant. Besides having a great influence on vehicle passing noise, the intake system noise is also a main source of noise in the vehicle, and because the noise source is very close to the vehicle cabin, the noise source greatly influences the riding comfort of the vehicle. In addition, the intake system of the engine is a very complex source of noise, including various types of noise, each of which is generated by a different mechanism. Therefore, optimizing the noise of the intake system firstly defines the reason of each noise source, determines the contribution of each noise source, and then solves the noise problem in a targeted manner.

The intake system noise can be classified into two major categories, air noise and structural noise, as a whole. The air noise includes pulsation noise and fluid noise. The pulsation noise is generated by pressure fluctuation caused by the periodic opening and closing of the intake valve, and the part of the noise mainly influences the low-frequency noise characteristic of the intake system. Further, if the natural frequency of the air column of the intake pipe coincides with the main frequency of the periodic pulsation noise, resonance sound of the air column is generated. Fluid noise is high frequency noise generated by airflow flowing through the intake valve flow cross section at high speed, forming a vortex.

According to research, sound waves at the opening of the wavelength tube move like a piston, radiation acoustic impedance exists, and the length obtained through theoretical calculation needs to be corrected. In addition, the practical installation position is limited, the wavelength tube is easy to bend and other objective conditions are considered, if the wavelength tube with the fixed length is adopted, the practical silencing effect is poor, the site fine adjustment is inconvenient, the wavelength tube is time-consuming and labor-consuming to rework, and the efficiency is low.

It should be noted that the information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present invention is to provide a noise reduction wavelength tube to solve the above problems.

The utility model adopts the following scheme:

the application provides a wavelength tube of making an uproar falls includes: a three-way valve for externally connecting an air inlet pipeline at an inlet side and a straight pipe body arranged at an outlet side of the three-way valve; the straight pipe body is constructed into a hollow tubular structure, the three-way valve is detachably inserted and arranged at one end of the straight pipe body, and the other end of the straight pipe body is plugged through a plug structure; the plug structure is adjustably arranged at the end position of the straight pipe body to limit an acoustic path allowed to be transmitted in the pipe.

As a further improvement, the straight pipe body is a quarter-wave pipe and is made of rubber.

As a further improvement, the outer diameter of the outlet side of the three-way valve is matched with the inner diameter of the straight pipe body.

As a further improvement, the outer diameter of the plug structure is matched with the inner diameter of the straight pipe body.

As a further improvement, the plug structure is configured to be a plug head with a cavity section, the plug head is at least partially embedded in the straight pipe body, and the cavity section is communicated with the inside of the straight pipe body, so that an effective transmission path of sound waves in the pipe is correspondingly adjusted.

As a further improvement, the plug head has a first limit position and a second limit position which are nested at the end part of the straight pipe body, and the overlapping area of the cavity section and the inside of the pipe can be adjusted between the two limit positions so as to form an effective sound wave transmission path.

As a further improvement, the length of the straight pipe body is 270mm, and the length of the cavity section is 100 mm; the effective transmission path of the sound wave is between 270mm and 370 mm.

As a further improvement, the peripheries of the two ends of the straight pipe body are provided with clamp parts, and the two clamp parts can be respectively and tightly connected at the joint of the three-way valve and the straight pipe body and the joint of the plug structure and the straight pipe body.

Further features of the invention will become apparent from the following description of exemplary embodiments (with reference to the attached drawings).

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a noise reduction wave tube according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of the plug structure of FIG. 1;

fig. 3 is a schematic structural diagram of a clamp member of a noise-reducing pipe according to an embodiment of the present invention.

Icon: 1-a three-way valve; 2-a straight pipe body; 3-a plug structure; 4-a clamp member; 5-plug head; 6-cavity section.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Examples

With reference to fig. 1 to 3, the present embodiment provides a noise reduction wavelength tube, including: a three-way valve 1 for externally connecting an intake pipe at an inlet side and a straight pipe 2 disposed at an outlet side of the three-way valve 1. The straight pipe body 2 is constructed into a hollow tubular structure, the three-way valve 1 is detachably inserted into one end of the straight pipe body 2, and the other end of the straight pipe body 2 is blocked by the blocking structure 3. Wherein, the plug structure 3 is adjustably arranged at the end position of the straight tube body 2 to limit the sound wave path which can be allowed to be transmitted in the tube.

In the above embodiment, the three-way valve 1 is externally connected to one end of the straight pipe body 2, so that the noise reduction wavelength tube can be adapted to various types of pipeline installation positions, and can be directly externally connected to a required air inlet pipeline through the three-way valve 1, thereby being not limited by an actual configuration space, and being not required to be bent and adjusted to adapt to an external pipeline aiming at the straight pipe body 2, and the applicability is better. Particularly, the other end of the straight tube body 2 is provided with a plug structure 3 capable of adjusting the plugging position, so that the sound wave path capable of being transmitted by the wave tube can be finely adjusted and adapted to sound wave transmission, the internal length of the sound wave path can be adjusted to the optimal silencing position, and the silencing effect of different noise frequencies in the corresponding sound wave path can be tested.

It should be mentioned that the three-way valve 1 has two oppositely arranged inlet sides and an outlet side which is butted against the straight pipe body 2, wherein both inlet sides can be butted against the external inlet line separately and transfer the noisy gas to the outlet side.

In addition, the noise reduction wavelength tube has the noise reduction principle that after sound waves are transmitted into the tube, one part of incident waves are reflected to form reflected waves, and the other part of incident waves are continuously transmitted in the tube and meet the reflected waves, so that the sound waves with the same frequency are mutually offset due to opposite phases, and the purpose of noise reduction is achieved.

In one preferred embodiment, the straight tube body 2 is a quarter wave tube and is made of rubber. Wherein, the straight body 2 as the wave pipe main part chooses for use to be the rubber tube, more does benefit to the transmission and the amortization of noise in the pipe. It should be noted that the quarter-wave tube is an acoustic element for performing noise reduction treatment on an automobile intake and exhaust system according to an acoustic principle, and is a typical passive muffler, and basically has a structure in which one end is open and the other end is closed. After the sound waves enter the pipeline and are transmitted to the quarter-wave tube, part of the sound waves enter the pipeline at the closed end and are reflected back to meet the incident sound waves, and the sound waves with specific frequency and the sound waves with the same frequency in the pipeline are mutually offset.

In one embodiment, the outer diameter of the outlet side of the three-way valve 1 is adapted to the inner diameter of the straight pipe body 2. Correspondingly, the outer diameter of the plug structure 3 is matched with the inner diameter of the straight pipe body 2. Thereby, the three-way valve 1 and the plug structure 3 can be tightly sleeved in the straight pipe body 2. Wherein, specifically, the both ends periphery of straight tube body 2 disposes clamp 4, and two clamp 4 can connect tightly respectively in the junction of three-way valve 1 and straight tube body 2 and the junction of end cap structure 3 and straight tube body 2. The tight hoop adjustment of the clamp piece 4 is convenient for the position adjustment and the sealing fastening of the plug structure 3, and the effect is particularly obvious.

In one embodiment, the stopper structure 3 is configured as a plug 5 with a cavity section 6, the plug 5 is at least partially embedded in the straight tube body 2, and the cavity section 6 is communicated with the inside of the straight tube body 2, so as to correspondingly adjust the effective transmission path of the sound wave in the tube. In the embodiment, the cavity section 6 is arranged on one side of the plug 5 facing the lower pipe, so that the length of the sound wave transmitted in the straight pipe body 2 is correspondingly prolonged, and the plug 5 enables the sound wave path to be controlled by the position adjustment of the plug 5 at the straight pipe body 2 by adjusting the embedding position of the plug 5 at the end part, thereby achieving the purpose of changing the length of the noise reduction wavelength pipe and being beneficial to operation and use.

More specifically, the plug 5 has a first extreme position and a second extreme position nested at the ends of the straight tube body 2 and is capable of adjusting the overlapping area of the cavity section 6 and the tube between the extreme positions to form an effective acoustic transmission path. In the first extreme position, the plug 5 is substantially completely inserted into the straight pipe body 2, and the cavity section 6 is just a final section that can form the straight pipe body 2. In the second extreme position, the plug 5 is as far away as possible from the straight body 2 and ensures that its end can be blocked, with the maximum effective transmission path inside the tube.

In particular, the length of the straight tube body 2 is 270mm and the length of the cavity section 6 is 100 mm. The effective transmission path of the sound wave is between 270mm and 370 mm. Wherein, the length 270mm is the optimum size of quarter wave pipe, is favorable to the amortization of the most number vehicle sound wave frequency. And the cavity section 6 arranged at one side of the plug 5 can be superposed in the pipe, and the effective transmission path of the sound wave in the pipe can be further regulated controllably through the embedded position of the plug 5 at the end part of the pipe body, so that the noise of the sound wave in each frequency section is reduced.

It should be noted that in other embodiments, the plug structure 3 may also be a solid plug (not shown), which eliminates a cavity section. Also, the stopper may extend into the tube to a maximum length of 100mm, and thus, is arranged to define an effective transmission path for the sound waves of between 170mm and 270 mm.

Above only the utility model discloses an it is preferred embodiment, the utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection.

Claims

1. A noise reducing wavelength tube comprising: a three-way valve for externally connecting an air inlet pipeline at an inlet side and a straight pipe body arranged at an outlet side of the three-way valve; it is characterized in that the preparation method is characterized in that,

the straight pipe body is constructed into a hollow tubular structure, the three-way valve is detachably inserted and arranged at one end of the straight pipe body, and the other end of the straight pipe body is plugged through a plug structure; wherein the content of the first and second substances,

the plug structure is adjustably arranged at the end position of the straight pipe body to limit the sound wave path allowed to be transmitted in the pipe.

2. The noise reducing wavelength tube of claim 1, wherein the straight tube body is a quarter wave tube and is made of rubber.

3. The noise reducing wavelength tube of claim 2, wherein an outer diameter of an outlet side of the three-way valve is adapted to an inner diameter of the straight tube body.

4. The noise reducing wavelength tube of claim 2, wherein the outer diameter of the plug structure is adapted to the inner diameter of the straight tube body.

5. The noise reduction tube as set forth in claim 4, wherein the plug structure is configured as a plug with a hollow section, the plug is at least partially embedded in the straight tube, and the hollow section is communicated with the inside of the straight tube to correspondingly adjust an effective transmission path of the sound wave in the tube.

6. The noise reducing tube of claim 5, wherein the plug has a first limit position and a second limit position nested at the end of the straight tube, and the overlap area of the cavity section and the tube is adjustable between the limit positions to form an effective acoustic transmission path.

7. The noise reducing wavelength tube of claim 6, wherein the length of the straight tube body is 270mm, and the length of the cavity section is 100 mm; the effective transmission path of the sound wave is between 270mm and 370 mm.

8. The noise reduction tube according to any one of claims 3 or 4, wherein the straight tube body is provided with clamp members at the peripheries of the two ends, and the two clamp members can be respectively and tightly connected to the joint of the three-way valve and the straight tube body and the joint of the plug structure and the straight tube body.