CN220771347U

CN220771347U - Muffler pipeline structure

Info

Publication number: CN220771347U
Application number: CN202321694894.XU
Authority: CN
Inventors: 罗元易; 肖剑波; 黄立章; 吴鸣; 殷兰
Original assignee: Xiamen Zhenwei Technology Co ltd
Current assignee: Xiamen Zhenwei Technology Co ltd
Priority date: 2023-06-29
Filing date: 2023-06-29
Publication date: 2024-04-12
Anticipated expiration: 2033-06-29

Abstract

The utility model discloses a muffler pipeline structure, which comprises: the muffler pipe cavity is connected with the pipeline and comprises an input pipe and an output pipe; the inner installation seat is fixed on the inner side wall of the muffler pipe cavity through a plurality of installation racks, holes are formed in the two sides of the inner installation seat, the inner installation seat comprises a flow guide pipe cavity positioned in the muffler pipe cavity, and a wind breaking cone head sleeved on one side of the flow guide pipe cavity close to the input pipe is arranged on the inner side of the flow guide pipe cavity; the secondary sound source is locked and fixed on an opening of the honeycomb duct cavity, which is close to one end of the output pipe, namely, the front end of the installation seat provided with the secondary sound source is provided with a wind breaking cone head, and the air flow state is changed through a conical structure on the wind breaking cone head, so that the resistance is reduced, namely, the front half part of an object is pointed, no obvious turning is generated in the shape change process of the object, the air is dispersed due to the impact of the pointed cone head, and the pointed cone head part can destroy the surface tension of the air, so that the resistance of the external structure of the sensor in a pipeline is reduced.

Description

Muffler pipeline structure

Technical Field

The utility model relates to the field of pipeline noise reduction, in particular to a pipeline structure of a muffler.

Background

The fresh air system is a continuous ventilation mode capable of controlling a ventilation path, the replacement of fresh air is completely controlled through a fan with good performance and an air flow control system, the technology has little influence on indoor temperature, the fresh air system is popular in a plurality of factories and families, the fresh air system is an independent air treatment system consisting of an air supply system and an air exhaust system, noise can be generated in the operation process of the fresh air system, the generated noise can have great influence on the installation environment, and the requirement on an installation structure is higher.

In the prior art, noise generated in the pipeline is counteracted by installing a secondary sound source in the pipeline, and other installation structures are required to be installed in the pipeline in order to fix the secondary sound source, so that the secondary sound source can stably generate reverse sound waves in the pipeline.

In practice, however, the mounting structure for the stationary secondary source collides with the air flow entering the duct, thereby creating new noise which mixes with the original noise or which remains after it has been cancelled, making the secondary source more difficult to cancel the duct noise.

Therefore, the scheme aims to provide a silencer pipeline structure which is not easy to generate other noise when the sensor contacts incoming air, enables the sensor to acquire more real data, feeds the more approximate data back to a control system of a secondary sound source and enables the anti-sound wave sent by the secondary sound source to be more matched with the noise.

Disclosure of Invention

The utility model provides a muffler pipeline structure which can effectively solve the problems.

The utility model is realized in the following way:

a muffler pipe structure comprising:

the muffler pipe cavity is connected with the pipeline and comprises an input pipe and an output pipe;

the inner installation seat is fixed on the inner side wall of the muffler pipe cavity through a plurality of installation racks, holes are formed in two sides of the inner installation seat, the inner installation seat comprises a flow guide pipe cavity positioned in the muffler pipe cavity, and a wind breaking cone head sleeved on one side, close to the input pipe, of the flow guide pipe cavity;

the secondary sound source is locked and fixed on an opening of the honeycomb duct cavity close to one end of the output pipe.

As a further improvement, the cross-sectional area of the honeycomb duct cavity gradually becomes smaller from the middle part to the two sides.

As a further improvement, a reference sensor is locked on an opening of one end, close to the input pipe, of the inner mounting seat, and the reference sensor points to one side of the wind breaking cone head.

As a further improvement, an error sensor is arranged at the tail end of the inner side of the pipe cavity of the silencer, and a wind breaking cone head is sleeved on the receiving end of the error sensor.

As a further improvement, one end of the wind breaking cone head pointing to the gas inlet direction is provided with a pointed cone head, the outer side surface of the wind breaking cone head is provided with a plurality of flow holes, and the flow holes face the gas inlet direction.

As a further improvement, the wind breaking cone head and the flow guiding pipe cavity are arranged at intervals to form a flow guiding groove, and the gas entering the wind breaking cone head through the flow guiding hole is output through the flow guiding groove.

As a further improvement, the mounting frame is of an inverted cone-like structure, and is provided with an air inlet part arranged towards one side of the air inlet direction and a flow guide part integrally formed with the air inlet part, and the air inlet part and the flow guide part form a cavity.

The beneficial effects of the utility model are as follows:

according to the utility model, the geometrical shape of the front end structure of the installation position of the inner installation seat is changed, namely, the front end of the installation seat provided with the secondary sound source is provided with the wind breaking cone head, and the air flow state is changed through the conical structure on the wind breaking cone head, so that the resistance is reduced, namely, the front half part of the object is pointed, no obvious turning is caused in the shape change process of the object, the gas is dispersed due to the impact of the pointed cone head, and the pointed cone head part can damage the surface tension of the air, so that the resistance of the external structure of the sensor in a pipeline is reduced.

And the front ends of the reference sensor and the error sensor are respectively provided with a wind breaking cone, and wind breaking treatment is carried out on the position straight line of the air flow reaching the sensor, so that other noises are not easy to generate when the air flow contacts with the sensor, the sensor can acquire more real data, the more approximate data can be fed back to a control system of the secondary sound source, and the counter sound wave sent by the secondary sound source is more matched with the noises.

On the basis of the above, the surface of the wind breaking cone head is also provided with the flow holes, meanwhile, the wind breaking cone head and the flow guiding pipe cavity are arranged at intervals to form a flow guiding groove, after the air flow flows into the sensor to collect noise data through the flow holes, the air flows out of the flow guiding groove between the wind breaking cone head and the flow guiding pipe cavity, so that the air flow is prevented from being backlogged in the structure, turbulence and local air pressure rise are avoided, and the acquisition result of the sensor is influenced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic front view of a muffler pipe structure according to the present utility model.

Figure 2 is a cross-sectional view of the utility model at A-A in figure 1.

Figure 3 is an isometric cut-away view of the utility model at A-A in figure 1.

Fig. 4 is a schematic perspective view of a mounting frame according to the present utility model.

Fig. 5 is a schematic view showing an internal structure of an inner mounting seat according to the present utility model.

Fig. 6 is a sound wave diagram of a secondary sound source mounted on the side of a muffler shell in the prior art.

Fig. 7 is a sound wave diagram of a muffler pipe structure of the present utility model.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model.

In the description of the present utility model, the terms "first," "second," and the like 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 defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Referring to fig. 1 to 5, a muffler pipe structure includes: a muffler lumen 10 connected to the pipe, the muffler lumen 10 including an input pipe 11 and an output pipe 12; the inner installation seat 20 is fixed on the inner side wall of the muffler pipe cavity 10 through a plurality of installation frames 30, holes are formed in two sides of the inner installation seat 20, the inner installation seat 20 comprises a flow guide pipe cavity 21 positioned in the muffler pipe cavity 10, and a wind breaking cone head 22 sleeved on one side of the flow guide pipe cavity 21 close to the input pipe 11; the secondary sound source 40 is locked and fixed on an opening of the flow guiding pipe cavity 21 near one end of the output pipe 12.

In this embodiment, the inlet pipe 11 and the outlet pipe 12 of the muffler pipe 10 are connected to the pipe, thereby reducing noise of air flowing through the pipe.

The muffler lumen 10 is not composed of a simple metal, and is divided into a multi-layered structure, specifically: the muffler pipe cavity 10 is provided with a thick galvanized steel plate, a thick damping layer, aluminum silicate sound absorption cotton, non-woven fabrics and a galvanized perforated plate which are sequentially arranged from outside to inside, and can reduce noise structurally through the material, and meanwhile, compared with the existing structure, the volume of the muffler pipe cavity is smaller, and the occupied installation space is smaller.

On the basis of setting the muffler pipe cavity 10, an active control system is introduced to control noise, an active control system is adopted to reduce noise value in a pipeline, first, a passive sound absorption material of the muffler pipe cavity 10 with a small volume is utilized to control middle and high frequency noise in the pipeline, and then a secondary sound source 40 is arranged in the muffler pipe cavity 10 to control low frequency noise in the pipeline in an active control mode, so that a full-band noise control effect is achieved.

Noise generated in different pipeline environments and under different working conditions is different in frequency, if it is obviously unreasonable to simply set the secondary sound source 40 with fixed frequency, in this embodiment, in order to improve the accuracy of active noise reduction of the secondary sound source 40, the amplitude of sound wave emitted by the secondary sound source can offset the noise source greatly, and emit sound wave closer to the noise source, and a reference sensor 50 is set at the front end of the secondary sound source 40, and the reference sensor 50 is used to acquire a specific sound wave pattern of the noise source and feed back the specific sound wave pattern to the position of the secondary sound source 40, so that the secondary sound source 40 can adjust the output sound wave in time according to the data acquired by the reference sensor 50, and the offset effect of the output counter sound wave is better.

However, although the amplitude and the phase of the reflected sound wave which is fed back by the reference sensor 50 and is regulated and output by the secondary sound source 40 are equal to those of the noise sound wave, due to the errors of the structure and installation in the pipeline, the signal received by the reference sensor 50 can deviate, or the reflected sound wave which is sent out by the secondary sound source 40 is not so accurate, in this way, an error sensor 60 is installed at the tail end of the inner side of the muffler pipe cavity 10, the receiving end of the error sensor 60 is sleeved with a wind breaking cone 22, the error sensor 60 is arranged at the rear end of the secondary sound source 40, the noise sound wave and the sound wave after the cancellation of the reflected sound wave can be obtained through the error sensor 60, the sound wave band after the cancellation is identified, so that the error amount of the reflected sound wave which is sent out is judged, and then fed back to the secondary sound source 40 for fine regulation, and the accuracy of the reflected sound wave is improved by adopting a rear end feedback mode.

In the practical application stage, some of the prior art thinks that the secondary sound source 40 is applied to a pipeline, usually, in order to facilitate installation, the secondary sound source 40 is directly installed on the outer side of the muffler, and some of the secondary sound source 40 is embedded into the muffler, that is, cancellation of sound waves is completed, however, in this arrangement mode, as shown in fig. 6, since the secondary noise source of the novel active muffler is longitudinally placed, multiple reflections occur between the secondary sound source and the pipe wall and interfere with the primary noise, so as to affect the noise reduction effect of the novel active muffler, in this embodiment, the secondary sound source 40 and the vertical line of the axis of the input pipe 11 are in the same line, so that sound waves with the same amplitude as the primary noise are generated, noise reduction is realized at the error sensor based on the principle of destructive interference, and specific illustration refers to fig. 7.

When the secondary sound source emits sound waves to the downstream of the pipeline, the sound waves are transmitted to the upstream of the pipeline, and when the reference microphone picks up the reference signal, the secondary sound source radiates the sound waves, so that the system is unstable. This phenomenon is called secondary acoustic feedback, and because the air flow moves in the pipe, the friction between the air flow and the pipe wall will generate secondary acoustic feedback, and the air flow velocity of the pipe inner wall will affect the data collection, so the data collected by the reference sensor 50 is not a real reference signal of the system, and the inaccurate reference signal will greatly affect the noise reduction performance of the system, therefore, the reference sensor 50, the secondary sound source 40, and the error sensor 60 are arranged on the same straight line with the vertical line of the axis of the input pipe 11, so that the sensor and the secondary sound source 40 are far away from the turbulence generated by the contact of the air and the muffler side wall.

In order to reduce the interference of the secondary sound source 40 by the air flow, the cross-sectional area of the flow guiding tube cavity 21 from the middle part to two sides is gradually reduced, that is, the cross-sectional area of the flow guiding tube cavity 21 from the middle part to two sides is gradually reduced, the reference sensor 50 is installed at the air inlet end of the flow guiding tube cavity 21, the error sensor 60 is installed at the air outlet side of the flow guiding tube cavity 21, the error sensor 60 points to the secondary sound source 40, and the secondary sound source 40 is arranged at the rear end of the central vertical line of the flow guiding tube cavity 21, so that the direct contact between the secondary sound source 40 and the air flow is avoided.

Although the generated counter sound wave is consistent with the pipeline sound wave, the flow guide pipe cavity 21 used for installing the reference sensor 50, the secondary sound source 40 and the error sensor 60 is easy to generate new noise when contacting with air flow, in this way, the air flow state is changed through the conical structure on the wind breaking conical head 22 by changing the geometric shape of the front end structure of the installation position of the inner installation seat 20, namely, the front end of the installation seat 20 provided with the secondary sound source 40, so that the resistance is reduced, namely, the front half part of an object is pointed, no obvious turning is generated in the shape change process of the object, the air is dispersed due to the impact of the pointed conical head, and the pointed conical head part breaks the surface tension of the air, so that the resistance of the external structure of the sensor in the pipeline is reduced.

The end of the wind breaking cone head 22 pointing to the air inlet direction is provided with a pointed cone head 221, the outer side surface of the wind breaking cone head 22 is provided with a plurality of flow holes 222, the flow holes 222 face the air inlet direction, the geometrical shapes of the front end structures of the installation positions of the reference sensor 50 and the error sensor 60 are changed, namely, the wind breaking cone head 22 is arranged at the front ends of the reference sensor 50 and the error sensor 60, the air flow state is changed through the pointed cone head 221 on the wind breaking cone head 22, so that the resistance is reduced, namely, the front half part of an object is pointed, no obvious turning is caused in the shape change process of the object, the air is dispersed due to the impact of the pointed cone head 221, the surface tension of the air is destroyed by the pointed cone head 221, the resistance of the outer structure of the sensor in a pipeline is reduced, and the detection result is prevented from being influenced due to the direct contact of the air and the sensor.

In order to avoid the air flow from accumulating in the structure, the aperture of the ventilation hole 222 is a small hole of 3mm, the ventilation cone 22 and the flow guiding pipe cavity 21 are arranged at intervals to form a flow guiding groove 70, the air entering the ventilation cone 22 through the ventilation hole 222 is output through the flow guiding groove 70, and after the air flows into the noise data collected by the sensor through the ventilation hole 222, the air flows out of the flow guiding groove 70 between the ventilation cone 22 and the flow guiding pipe cavity 21, so that the air flow is prevented from accumulating in the structure, turbulence and local air pressure rise are caused, and the collecting result of the sensor is influenced.

The honeycomb duct cavity 21 needs firm fixing in silencer lumen 10, specifically, the outside in honeycomb duct cavity 21 is through a plurality of mounting brackets 30 fixed mounting on silencer lumen 10's inside wall, and though having set up fixed structure and keep firm, but mounting bracket 30 becomes the factor that hinders the air current power easily, so mounting bracket 30 is the type reverse taper structure, mounting bracket 30 has the air inlet portion 31 and the water conservancy diversion portion 32 with air inlet portion 31 integrated into one piece that set up towards air inlet direction one side, air inlet portion 31 and water conservancy diversion portion 32 form a cavity 33, and air inlet portion 31 and water conservancy diversion portion 32 become narrow gradually along the air current direction, reduce the friction with the air, avoid the air noise to produce, and the wire rod installation space of secondary sound source 40 and sensor can be reserved in the setting of cavity 33.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, and various modifications and variations may be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A muffler pipe structure, comprising:

a muffler lumen (10) connected to the pipe, the muffler lumen (10) comprising an input pipe (11) and an output pipe (12);

the inner installation seat (20) is fixed on the inner side wall of the muffler pipe cavity (10) through a plurality of installation racks (30), holes are formed in two sides of the inner installation seat (20), the inner installation seat (20) comprises a flow guide pipe cavity (21) positioned in the muffler pipe cavity (10), and a wind breaking cone head (22) sleeved on one side, close to the input pipe (11), of the flow guide pipe cavity (21);

the secondary sound source (40) is locked and fixed on an opening of the honeycomb duct cavity (21) close to one end of the output pipe (12).

2. A muffler pipe structure as claimed in claim 1, wherein the cross-sectional area of the flow guiding pipe chamber (21) is gradually reduced from the middle portion to both sides.

3. The muffler pipe structure as defined in claim 1, wherein a reference sensor (50) is locked to an opening of the inner mounting base (20) near one end of the input pipe (11), and the reference sensor (50) is directed to one side of the wind breaking cone (22).

4. The muffler pipeline structure according to claim 1, wherein an error sensor (60) is mounted at the end of the inner side of the muffler pipe cavity (10), and a wind breaking cone head (22) is sleeved on the receiving end of the error sensor (60).

5. The muffler pipeline structure as claimed in claim 1, wherein one end of the wind breaking cone head (22) pointing to the gas inlet direction is provided with a pointed cone head (221), the outer side surface of the wind breaking cone head (22) is provided with a plurality of flow holes (222), and the flow holes (222) face the gas inlet direction.

6. The muffler pipe structure as defined in claim 5, wherein the wind-breaking cone (22) is spaced from the flow guiding pipe cavity (21) and forms a flow guiding groove (70), and the gas entering the wind-breaking cone (22) through the flow guiding hole (222) is outputted through the flow guiding groove (70).

7. The muffler pipe structure as claimed in claim 1, wherein the mounting frame (30) has an inverted cone-like structure, the mounting frame (30) has an air inlet portion (31) disposed toward one side of a gas inlet direction and a flow guiding portion (32) integrally formed with the air inlet portion (31), and the air inlet portion (31) and the flow guiding portion (32) form a cavity (33).