CN106286038A - A kind of silence type car admission line system - Google Patents

Abstract

The invention discloses a sound-absorbing type car intake pipe system, which is characterized in that an intake pipe muffler adopting the Holmhertz noise reduction principle is arranged in the air intake pipe system, and the air intake pipe muffler includes a core pipe , the inner cavity of the core tube forms a channel part for ventilation, a number of sound-absorbing holes are evenly arranged in the middle of the core tube along the circumferential direction, and a sound-absorbing shell is set on the outer periphery of the middle of the core tube, and the two ends of the sound-absorbing shell are sealed with the core tube and arranged A chamber portion for producing a resonance sound-absorbing effect is formed between the sound-absorbing shell and the core pipe. The invention has the advantages of simple structure, noise reduction, convenient connection, favorable assembly, reduced vibration and the like.

Description

A sound-absorbing car air intake duct system

technical field

The invention relates to the field of car engine air intake systems, in particular to a noise-absorbing car intake pipe system.

Background technique

The assembly of parts that introduces air or mixed gas into the engine cylinder in a car is called the engine intake system. In the engine air intake system, the air filter is the main component of the air intake part, which is used to filter the air entering the engine. The air filter is generally arranged above the engine, and the air outlet of the air filter is connected to the engine throttle through the intake pipe.

The existing car air intake pipeline system generally adopts the structural form of an integral hose or a two-section butt joint hose. For example, CN201520081736.6 discloses a kind of automobile engine intake pipe, which includes intake pipe 1 and intake pipe 2, the intake pipe 1 and intake pipe 2 are connected by a curved pipe, the intake pipe 1, the intake pipe 2 and the curved pipe are integrally formed, A fan is arranged inside the air intake pipe, and the fan includes a bracket and several blades arranged on the inner wall of the air intake pipe one. The middle part of the support is provided with a rotor that drives the blades to rotate. An electronic controller for controlling the fan speed is arranged on the outer wall of the fan. For another example, CN201120426933.9 discloses a car engine intake pipe, which includes a first section of intake pipe, a second section of intake pipe, a sensor mounting support and a buffer sleeve; the upper end of the first section of the intake pipe is connected to the second The lower end of the second section of the intake pipe is connected through the sensor installation support; the buffer sleeve is arranged at the lower end of the first section of the intake pipe; the sensor installation support is connected with the first section of the intake pipe and the second section of the intake pipe. The two-stage intake pipe is integrally formed.

The automobile engine intake pipes of the above two existing patents all belong to the structural form of two sections of butt-joint flexible pipes. Although this existing engine air intake pipeline system is relatively simple in structure, it still has the following defects: 1. If the material of the pipeline is too hard, it is not conducive to installation and steering, and if the material of the pipeline is too soft, it will increase the shaking of the pipeline and affect The piping system was working normally, and a collision resulted in breakage. 2. It is still inconvenient to connect the two ends of the pipeline system to the engine throttle and the outlet of the air filter. 3. Due to the large turn of the pipeline system, it is easy to generate noise when the air intake is large, especially when the air intake volume is large, the noise is relatively large. Especially for a small car model LFX70, the above-mentioned defects are particularly obvious due to the large amount of engine air intake, and the direction of the engine throttle valve and the outlet of the air filter in this model are close to the same, and there is only a small included angle. A new intake duct system needs to be designed to overcome the deficiencies.

Contents of the invention

Aiming at the deficiencies of the above-mentioned prior art, the technical problem to be solved by the present invention is: how to provide a noise-absorbing car air intake duct system that is simple in structure, can reduce noise, facilitate connection, facilitate assembly, and reduce vibration.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

A noise reduction type car intake pipe system, characterized in that the intake pipe system is provided with an intake pipe muffler that adopts the Holmhertz noise reduction principle, and the intake pipe muffler includes a core tube, and the inner cavity of the core tube A channel part for ventilation is formed, and the middle part of the core tube is evenly arranged with a number of sound-absorbing holes along the circumferential direction, and the outer periphery of the middle part of the core tube is provided with a sound-absorbing shell, and the two ends of the sound-absorbing shell are sealed with the core tube and installed in the sound-absorbing shell A chamber part for generating resonance and noise reduction effect is formed between the core tube and the core tube.

In this way, the setting of the muffler of the intake pipe can benefit the principle of resonance noise reduction to eliminate intake noise and reduce vehicle noise pollution. In the muffler structure, the setting of the core tube can avoid interference to the air flow to the greatest extent. At the same time, a noise-absorbing shell is set around the core tube to form a resonance cavity. The formed resonant cavity then forms part of the noise reduction effect, which better eliminates the airflow noise.

As an optimization, one side of the sound-absorbing shell is axially designed as a three-stage step shape with a gradually decreasing distance from the core pipe from front to back, and the outer surface of each step on this side of the sound-absorbing shell has multiple stages in the circumferential direction An irregular curved surface formed by the smooth connection of arc-shaped surfaces, the other side of the sound-absorbing shell is designed to include a straight slope section at the front and a slope section at the rear along the axial direction, and this side of the sound-absorbing shell is in the circumferential direction It is an irregularly folded connection surface composed of multiple planes folded together and the joints connected smoothly.

In this way, one side of the housing is designed in a three-level step shape, which can better eliminate noise in the three frequency ranges. At the same time, the unique shell structure of the muffler makes its axial front and rear positions and circumferential positions in all directions Both of them form an irregular and asymmetric inner cavity structure, which greatly improves the effect of sound wave reflection interference in the inner cavity of the sound-absorbing shell. Intake noise can be minimized.

Further, the core tube is also fixedly provided with two rings of baffles that extend outward and are fixedly connected to the inner wall of the sound-absorbing shell, and the outer ends of the baffles are connected to the bends of the steps of the sound-absorbing shell.

In this way, relying on the two partitions, three different volumes of noise reduction resonance cavities are formed at the three steps, which can eliminate the noise in the three frequency bands in a more targeted manner, improve the noise reduction pertinence and better ensure the noise reduction frequency range.

Further, a through hole is provided on the outer side of the partition facing the three-step step of the sound-absorbing casing, and a through hole is provided near the three-step step, and the outer surfaces of each step in the three-step step on the sound-absorbing casing are convex curved surfaces.

In this way, the sound waves reflected by the inner wall of the sound-absorbing shell in the three sound-absorbing resonant cavities can negotiate and collide at the through holes, so as to obtain a better sound-absorbing effect.

Further, the noise-absorbing shell is obtained by butt-connecting the injection-molded upper shell and the lower shell, and the butt joints of the upper shell and the lower shell are provided with connecting lugs, which are sealed and welded outside the core tube after being fitted by the connecting lugs . In this way, the injection molding process is used to manufacture, the mold is relatively complicated, and there are many processes, but the yield is high and the performance is stable.

When the intake pipe muffler is not equipped with a partition, the muffler shell can be obtained by integral blow molding, and then inserted into the core tube to seal and fix it to form a muffler. This has the advantages of simple mold and less process, but the yield is low.

Further, the air intake pipeline system includes an air filter connecting section pipeline with one end integrally bent for connecting with the outlet of the air filter, and an engine connecting section pipeline with one end integrally bent for connecting with the engine throttle, and also includes The intermediate pipe between the air filter connecting pipe and the engine connecting pipe is fixedly connected by a clamp, the material hardness of the middle pipe is greater than the material hardness of the air filter connecting pipe and the engine connecting pipe, and the middle pipe is provided with The pipe fixing structure is fixedly installed on the car body by the pipe fixing structure; the front end of the core pipe is used to connect with the air filter connecting section pipe, and the back end of the core pipe is used to connect with the middle section pipe so that the inner cavity of the core pipe forms a ventilator channel part.

In this way, the noise-absorbing car intake pipe system is divided into front, middle and rear pipes, and the middle pipe is made of a harder material, and a pipe fixing structure is set on it to fix it on the car body, so that the air intake pipe system It can realize the installation and fixation, avoid shaking, vibration and other phenomena, reduce the noise from the root and improve the protection effect of the pipeline. At the same time, the pipeline of the connecting section of the air filter and the pipeline of the connecting section of the engine are made of soft materials, which can facilitate the installation and connection with the outlet of the air filter and the throttle valve of the engine to ensure the ventilation effect. Among them, as a better option, the air filter connecting section pipeline and the engine connecting section pipeline are made of flexible plastic, and the middle section pipeline is made of hard plastic, so that its cost is cheap, it is convenient to manufacture and can ensure the achievement of the above effects . At the same time, the position of the muffler is set at the upper rear end of the connecting section of the air filter and the joint of the middle section of the pipeline. This is the junction of soft and hard materials in the pipeline. A muffler based on the principle of a resonant cavity is installed here to change the flow of the air flow and achieve better results. noise reduction effect.

As an optimized form of the pipeline fixing structure, the pipeline fixing structure includes a flattened I-shaped ferrule, the middle part of the ferrule fits on the outer wall of the pipeline along the axial direction of the pipeline, and the left and right ends of the front and rear parts After being bent along the circumferential direction of the pipe, it is connected along the horizontal direction to form a suit body attached to the outer wall of the pipe, and bolt holes are provided at the joints of the left and right ends of the front and rear parts of the ferrule; the pipe fixing structure also includes an overall arc A sheet-shaped support bracket, the support bracket extends horizontally along one end of the arc and is provided with two bolt holes correspondingly, and is fixedly connected by the bolt holes at the joints of the left and right ends of the front and rear parts of the ferrule, and the support bracket The other end bends and extends outward and downward, and is provided with two bolt holes spaced along the front and back, and is used to be fixed on the car body by bolts.

In this way, the pipeline fixing structure does not need to be welded, and can be directly assembled and installed. It has the characteristics of simple structure, convenient installation, and reliable fixation, and the I-shaped ferrule is used, which uses less material and improves the tightness of the middle section of the pipeline. Combined with the effect, the reliability of fixing is greatly guaranteed. The structure of the supporting bracket adopted facilitates the transition connection with the vehicle body and has the effect of shock absorption and buffering, which ensures the reliability and durability of the connection.

Further, the ferrule and the supporting bracket are both made of stainless steel, which can ensure the supporting strength. Furthermore, the periphery of the support bracket has inwardly bent flanges to improve its own strength. Further, the middle of the horizontally extending part of the support bracket has upward ribs to improve its own strength. The middle part of the lower side of the supporting bracket extending outward and downward is concavely set to save material and facilitate position limitation during installation. Further, the outer surface of the corner of the support bracket is provided with two concave recesses at intervals along the front-to-back direction, so as to further strengthen the strength of the support bracket.

As another optimized form of the pipeline fixing structure, the pipeline fixing structure includes two lugs arranged at intervals along the axial direction of the pipeline, the inner ends of the lugs are welded and fixed in the middle of the side of the outer wall of the pipeline, and the outer ends extend horizontally outwards The front and rear sides of the lugs are bent and then extended upwards, and the bottom of the lugs is provided with bolt holes; the pipe fixing structure also includes a support bracket that is in the shape of an arc as a whole, and the support bracket extends horizontally along one end of the arc and is correspondingly provided with two The other end of the support bracket bends and extends outward and downward, and two bolt holes are arranged along the front and rear intervals and are used to be fixed on the car body by bolts.

In this way, although the installation of the two lugs needs to be fixed by welding, the overall structure is simpler, saves materials, and also has the characteristics of convenient installation and reliable fixing. The structure of the supporting bracket adopted facilitates the transition connection with the vehicle body and has the effect of shock absorption and buffering, which ensures the reliability and durability of the connection.

Further, the lugs and the supporting bracket are both made of stainless steel, which can ensure the supporting strength. Furthermore, the periphery of the support bracket has inwardly bent flanges to improve its own strength. Further, reinforcing grooves are provided on the supporting bracket along the inner and outer directions to improve its own strength. The middle part of the lower side of the supporting bracket extending outward and downward is concavely set to save material and facilitate position limitation during installation. Further, an elastic shock-absorbing sleeve is arranged in the bolt hole of the support lug, and the bolt connected with the support lug is connected after passing through the elastic shock-absorbing sleeve, so as to improve the shock-absorbing effect.

As an optimization, the pipeline in the middle section includes a straight section at one end connected with the air filter connecting section pipeline and a curved section at one end connected with the engine connecting section pipeline, the pipeline fixing structure is arranged on the straight section, and the curved section The outer surface of the segment is convexly formed with grid-like reinforcing ribs.

In this way, the pipe fixing structure is set on the straight section, which can facilitate its setting and installation; the connecting end of the middle section pipe and the engine connecting section pipe is set as a curved section structure, because the pipe interface of the engine throttle is small and the angle deviation is large , making it more inconvenient to install, so a curved section structure is set on the middle section of the pipeline to connect with the engine connection section pipeline, and the middle section of the pipeline bears part of the angle turning requirements of the engine connection section pipeline, which can greatly reduce the need for the engine connection section The setting requirements and installation requirements of the pipeline facilitate the overall assembly of the intake pipeline system and ensure the assembly effect. The reinforcing ribs provided on the curved section can improve the structural strength of this joint and ensure reliable assembly.

Further, the curved section of the pipeline in the middle section is also provided with an oil-gas return communication pipe for connecting with the ventilation pipe of the crankcase of the engine. In this way, the oil-gas return connecting pipe can ensure the air pressure adjustment balance in the engine crankcase, and at the same time, the oil-gas return connecting pipe is arranged on the curved section of the middle pipe to ensure its own strength and connection reliability, and its position away from the air filter can avoid damage to the engine. Erosion of the air filter element.

As an optimization, the two ends of the pipe in the middle section are each provided with a clamp connection structure. The clamp connection structure includes two rings of clamping protrusions formed on the outer circumference of the pipeline and arranged at intervals in the axial direction. The two rings of clamping protrusions A clip mounting groove is formed in the middle.

The width of the clamp installation groove is slightly larger than the width of the clamp. In this way, it is convenient to align the clamp installation groove for installation and tightening when the clamp is assembled, so that another section of flexible material pipe located above the clamp installation groove is clamped and deformed and falls into the Insert it into the clamp installation groove to ensure the tight sealing effect.

Further, the height of the inner ring of snap-fit protrusions exceeds the height of the outer ring of snap-fit protrusions, and the outermost end of the inner ring of snap-fit protrusions has a limiting protrusion extending outward. This makes it easier to assemble the limit position. Furthermore, in the clamp connection structure, the outer surface of the outer ring of clamping protrusions is inclined and extends to the end surface of the middle section of the pipeline, so as to facilitate the insertion of flexible pipelines at both ends during assembly.

As an optimization, the pipeline of the connecting section of the air filter is bent as a whole, and a bellows section is arranged at the front end of the pipeline of the connecting section of the air filter close to the outlet of the air filter.

In this way, the pipe in the connecting section of the air filter can meet the angle-changing connection requirements of the air outlet of the air filter, especially the setting of the bellows, which is more convenient for its installation and connection.

Further, the outer walls of the pipes at the front and rear ends of the corrugated pipe section protrude outward to form grid-like reinforcing ribs, so as to improve its overall strength.

Further, an outward connecting plate is welded and fixed on the rear end side of the bellows section, and a card slot is formed on the outer end of the connecting plate, so that the bellows can be fastened and fixed on the vehicle body by the card slot of the connecting plate to avoid Shaking of the bellows section for stability and better noise cancellation. Further, the card slot has a spherical crown-shaped card connection cavity located inside and a card access port with a smaller width located outside. In this way, it is convenient to engage the clamping slot with the cylindrical fixing member structure on the vehicle body.

Further, the outer surfaces of both ends of the core tube are provided with clip installation grooves along the circumference, which facilitates the installation and fixing of the clip.

Further, an EPDM plastic hose is fixedly connected between the muffler of the intake pipe and the middle pipe by means of a clamp. This is because the core pipe of the intake pipe muffler is a plastic hard pipe, which is the same hard plastic as the middle pipe, so adding a plastic hose at one end can ensure the connection and sealing effect of the two.

To sum up, the present invention has the advantages of simple structure, noise reduction, convenient connection, favorable assembly, and reduced vibration.

Description of drawings

Fig. 1 is a three-dimensional structure diagram of the best embodiment of the present invention.

Fig. 2 is a schematic structural view of the single middle section pipeline in Fig. 1 .

Fig. 3 is a left side view of Fig. 2 .

FIG. 4 is a top view of FIG. 2 .

Fig. 5 is a structural schematic view showing another specific embodiment of the pipeline fixing structure on the pipeline in the middle section.

FIG. 6 is a top view of FIG. 5 .

Fig. 7 is a schematic structural view of the single intake pipe muffler in Fig. 1 .

Fig. 8 is a left side view of Fig. 7 .

Fig. 9 is a schematic view showing the structure of another specific embodiment of the muffler for the intake pipe.

Fig. 10 is a left side view of Fig. 9 .

detailed description

The present invention will be further described in detail below in conjunction with the best implementation mode and accompanying drawings.

Optimum implementation mode: as shown in Figure 1-10, a sound-absorbing car intake pipe system includes an air filter connecting section pipe 1 with an integrally curved end for connecting with the air filter outlet, and an overall curved One end is used for connecting the engine connecting section pipeline 2 with the engine throttle, which also includes an intermediate section pipeline 4 fixedly connected to the air filter connecting section pipeline and the engine connecting section pipeline through a clamp 3 (the clamp adopts The spring worm clamp has the characteristics of large clamping force, uniform force in the circumferential direction, and pre-tightening effect. It is suitable for the connection between the hard material pipe and the flexible material pipe here), and the material hardness of the middle pipe 4 is greater than the above-mentioned The pipe 1 of the air filter connecting section and the pipe 2 of the connecting section of the engine have material hardness, and the middle pipe 4 is provided with a pipe fixing structure and is fixedly installed on the car body by the pipe fixing structure.

In this way, the noise-absorbing car intake pipe system is divided into front, middle and rear pipes, and the middle pipe is made of a harder material, and a pipe fixing structure is set on it to fix it on the car body, so that the air intake pipe system It can realize the installation and fixation, avoid shaking, vibration and other phenomena, reduce the noise from the root and improve the protection effect of the pipeline. At the same time, the pipeline of the connecting section of the air filter and the pipeline of the connecting section of the engine are made of soft materials, which can facilitate the installation and connection with the outlet of the air filter and the throttle valve of the engine to ensure the ventilation effect. Among them, as a better option, the air filter connecting section pipeline and the engine connecting section pipeline are made of flexible plastic, and the middle section pipeline is made of hard plastic, so that its cost is cheap, it is convenient to manufacture and can ensure the achievement of the above effects .

In this preferred embodiment, the pipe fixing structure includes a ferrule 5 that is flattened into an I-shape, the middle part of the ferrule 5 is attached to the outer wall of the pipe along the axial direction of the pipe, and the left and right ends of the front and rear parts of the ferrule 5 After being bent along the circumferential direction of the pipe, it is connected along the horizontal direction to form a suit body attached to the outer wall of the pipe, and bolt holes are provided at the joints of the left and right ends of the front and rear parts of the ferrule; the pipe fixing structure also includes an overall arc A sheet-shaped support bracket 6, the support bracket 6 extends horizontally along one end of the arc and is correspondingly provided with two bolt holes, and is fixedly connected by bolts 7 and the bolt holes at the joints of the left and right ends of the front and rear parts of the ferrule The other end of the support bracket 6 bends and extends outward and downward, and is provided with two bolt holes at intervals along the front and back, and is used to be fixed on the car body by bolts.

In this way, the pipeline fixing structure does not need to be welded, and can be directly assembled and installed. It has the characteristics of simple structure, convenient installation, and reliable fixation, and the I-shaped ferrule is used, which uses less material and improves the tightness of the middle section of the pipeline. Combined with the effect, the reliability of fixing is greatly guaranteed. The structure of the supporting bracket adopted facilitates the transition connection with the vehicle body and has the effect of shock absorption and buffering, which ensures the reliability and durability of the connection.

In this optimal implementation manner, the ferrule and the supporting bracket are both made of stainless steel, which can ensure the supporting strength. During implementation, the periphery of the support bracket 6 has inwardly bent flanges to improve its own strength. Wherein, there is an upward rib 8 in the middle of the horizontally extending part of the support bracket 6 to improve its own strength. Wherein, the middle part of the lower side of the supporting bracket 6 extending outward and downward is concavely set, so as to save material and facilitate position limitation during installation. Wherein, the outer surface of the corner of the supporting bracket 6 is provided with two concave recesses 9 at intervals along the front and rear directions, so as to further strengthen the strength of the supporting bracket.

Referring to Figures 5-6, as another embodiment of the pipeline fixing structure, the pipeline fixing structure includes two lugs 10 arranged at intervals along the axial direction of the pipeline, and the inner ends of the lugs 10 are welded and fixed in the middle of the outer wall of the pipeline , the outer end extends horizontally outwards, the front and rear sides of the lug 10 are bent and then extended upwards, and the bottom of the lug 10 is provided with bolt holes; the pipeline fixing structure also includes a supporting bracket 11 that is in the shape of an arc as a whole, and the supporting bracket 11 Extend horizontally along one end of the arc and are provided with two bolt holes correspondingly, and are fixedly connected by the bolt 12 and the corresponding bolt hole at the bottom of the lug, and the other end of the support bracket 11 bends outward and extends downward and is provided with two bolts along the front and rear intervals holes and are used for bolting to the car body.

In this way, although the installation of the two lugs needs to be fixed by welding, the overall structure is simpler, saves materials, and also has the characteristics of convenient installation and reliable fixing. The structure of the supporting bracket adopted facilitates the transition connection with the vehicle body and has the effect of shock absorption and buffering, which ensures the reliability and durability of the connection.

In the pipeline fixing structure of another embodiment above, further, the lugs 10 and the support bracket 11 are made of stainless steel, which can ensure the support strength. Further, the periphery of the support bracket 11 has inwardly bent flanges to improve its own strength. Further, the support bracket 11 is provided with reinforcing grooves 13 along the inner and outer directions to improve its own strength. The middle part of the lower side of the supporting bracket 11 extending outwards and downwards is set concavely, so as to save material and facilitate positioning during installation. Furthermore, an elastic shock absorbing sleeve 14 is arranged in the bolt hole of the support lug 10, and the bolt 12 connected with the support lug passes through the elastic shock absorbing sleeve 14 and then connected to improve the shock absorption effect.

In the optimal implementation of the noise-absorbing type car air intake pipeline system, the middle section pipeline 4 includes a straight section at one end connected with the air filter connection section pipeline and a curved section 15 at one end connected with the engine connection section pipeline , the pipeline fixing structure is arranged on the straight section, and the outer surface of the curved section 15 is convexly formed with grid-shaped reinforcing ribs 26 .

In this way, the pipe fixing structure is set on the straight section, which can facilitate its setting and installation; the connecting end of the middle section pipe and the engine connecting section pipe is set as a curved section structure, because the pipe interface of the engine throttle is small and the angle deviation is large , making it more inconvenient to install, so a curved section structure is set on the middle section of the pipeline to connect with the engine connection section pipeline, and the middle section of the pipeline bears part of the angle turning requirements of the engine connection section pipeline, which can greatly reduce the need for the engine connection section The setting requirements and installation requirements of the pipeline facilitate the overall assembly of the intake pipeline system and ensure the assembly effect. The reinforcing ribs provided on the curved section can improve the structural strength of this joint and ensure reliable assembly.

Wherein, the curved section 15 of the middle section pipeline 4 is also provided with an oil-gas return communication pipe 16 for connecting with an engine crankcase ventilation pipe. In this way, the oil-gas return connecting pipe can ensure the air pressure adjustment balance in the engine crankcase, and at the same time, the oil-gas return connecting pipe is arranged on the curved section of the middle pipe to ensure its own strength and connection reliability, and its position away from the air filter can avoid damage to the engine. Erosion of the air filter element.

Wherein, the two ends of the middle pipe 4 are respectively provided with a clamp connection structure, the clamp connection structure includes two rings of clamping protrusions formed on the outer circumference of the pipeline and arranged at intervals along the axial direction, and the two rings of clamping protrusions A clip mounting groove 17 is formed in the middle.

Wherein the width of clamp installation groove 17 is slightly greater than the width of the clamp, so that when the clamp is assembled, it is convenient to align the clamp installation groove for installation and tightening, so that another section of flexible material pipeline located above the clamp installation groove is clamped and deformed. Insert it into the clamp installation groove to ensure the tight sealing effect.

Wherein, the height of the inner ring of snap-fit protrusions exceeds the height of the outer ring of snap-fit protrusions, and the outermost end of the inner ring of snap-fit protrusions has a limiting protrusion 18 extending outward. This makes it easier to assemble the limit position. Furthermore, in the clamp connection structure, the outer surface of the outer ring of clamping protrusions is inclined and extends to the end surface of the middle section of the pipeline, so as to facilitate the insertion of flexible pipelines at both ends during assembly.

Wherein, the pipe 1 of the connecting section of the air filter is bent as a whole, and a bellows section 19 is arranged at the front end of the pipe 1 of the connecting section of the air filter near the outlet of the air filter.

In this way, the pipe in the connecting section of the air filter can meet the angle-changing connection requirements of the air outlet of the air filter, especially the setting of the bellows, which is more convenient for its installation and connection.

Wherein, grid-shaped reinforcing ribs 20 are protruded on the outer walls of the pipe at the front and rear ends of the bellows section 19 to improve its overall strength.

Wherein, an outward connecting plate 21 is welded and fixed on one side of the rear end of the bellows section, and a card slot 22 is formed on the outer end of the connecting plate 21; in this way, the bellows is conveniently fastened and fixed on the vehicle body by the card slot of the connecting plate, To avoid shaking of the bellows section, to ensure stability and to better eliminate noise. Wherein, the locking groove 22 has a spherical crown-shaped locking cavity on the inside and a locking opening with a smaller width on the outside. In this way, it is convenient to engage the clamping slot with the cylindrical fixing member structure on the vehicle body.

Wherein, an intake pipe muffler adopting the Holmhertz noise reduction principle is also arranged at the upper rear end of the air filter connecting section pipeline 19 . A channel part for ventilation and a chamber part communicating with the channel part for producing resonance and noise reduction effect are formed in the intake pipe muffler.

In this way, the setting of the muffler of the intake pipe can benefit the principle of resonance noise reduction to eliminate intake noise and reduce vehicle noise pollution. At the same time, the position of the muffler is set at the upper rear end of the connecting section of the air filter and the joint of the middle section of the pipeline. This is the junction of soft and hard materials in the pipeline. A muffler based on the principle of a resonant cavity is installed here to change the flow of the air flow and achieve better results. Noise reduction effect.

Wherein, the intake pipe muffler includes a core tube 23, the front end of the core tube 23 is used to connect with the air filter connecting section pipeline 1, and the rear end of the core tube 23 is used to connect with the middle section pipeline 4 so that the inner cavity of the core tube is formed for ventilation. The middle part of the core tube 23 is evenly arranged with a number of muffler holes 24 along the circumferential direction, and the outer periphery of the middle part of the core tube 23 is provided with a muffler shell 25, and the two ends of the muffler shell 25 are sealed with the core tube 23 and installed in the muffler. Between the acoustic shell 25 and the core tube 23 is formed a chamber part for generating resonance and noise reduction effect.

In the muffler with such a structure, the setting of the core tube can avoid interference to the air flow to the greatest extent. The resonant cavity formed by the casing forms part of the noise reduction effect, which better eliminates the airflow noise.

Wherein, the outer surfaces of both ends of the core tube 23 are provided with clamp installation grooves 26 along the circumferential direction, so as to facilitate the installation and fixing of the clamp.

Wherein, one side of the sound-absorbing shell 25 is axially designed as a three-stage stepped shape 27 whose distance from the core tube gradually decreases from front to back, and the outer surface of each step on the side of the sound-absorbing shell is circumferentially The irregular curved surface formed by the smooth connection of multiple arc-shaped surfaces, the other side of the sound-absorbing shell is designed to include a straight slope section 28 at the front and a slope section 29 at the rear along the axial direction, and the sound-absorbing shell 25 is the The side is an irregularly folded connection surface formed by multi-segment plane folds connected in the circumferential direction and the joints are smoothly connected.

In this way, one side of the housing is designed in a three-level step shape, which can better eliminate noise in the three frequency ranges. At the same time, the unique shell structure of the muffler makes its axial front and rear positions and circumferential positions in all directions Both of them form an irregular and asymmetric inner cavity structure, which greatly improves the effect of sound wave reflection interference in the inner cavity of the sound-absorbing shell. Intake noise can be minimized.

Wherein, the core tube 23 is also fixedly provided with two rings of baffles 30 extending outward and fixedly connected to the inner wall of the sound-absorbing shell, and the outer ends of the baffles 30 are connected to the bends of the steps of the sound-absorbing shell.

In this way, relying on the two partitions, three different volumes of noise reduction resonance cavities are formed at the three steps, which can eliminate the noise in the three frequency bands in a more targeted manner, improve the noise reduction pertinence and better ensure the noise reduction frequency range.

During implementation, it may be further provided that the outer side of the partition 30 facing the three-stage step facing the sound-absorbing shell is provided with a through hole near the three-stage step, and the outer surfaces of each step in the three-stage steps on the sound-absorbing shell are all is a convex surface.

In this way, the sound waves reflected by the inner wall of the sound-absorbing shell in the three sound-absorbing resonant cavities can negotiate and collide at the through holes, so as to obtain a better sound-absorbing effect.

In this embodiment, the noise-absorbing shell 25 is obtained by butt-connecting an injection-molded upper shell and a lower shell, and connecting lugs are provided at the butt joints of the upper shell and the lower shell, and are sealed and welded after being fitted by the connecting lugs. Outside the core tube. In this way, the injection molding process is used to manufacture, the mold is relatively complicated, and there are many processes, but the yield is high and the performance is stable.

In this embodiment, an EPDM plastic hose 31 is fixedly connected between the muffler of the intake pipe and the pipe in the middle section by means of a clamp. This is because the core pipe of the intake pipe muffler is a plastic hard pipe, which is the same hard plastic as the middle pipe, so adding a plastic hose at one end can ensure the connection and sealing effect of the two.

Figure 9 and Figure 10 disclose another specific implementation structure of the intake pipe muffler, wherein, on the basis of the above-mentioned intake pipe muffler structure, the setting of the partition plate is canceled, and the muffler shell 25 is obtained by integral blow molding, and then inserted into the core The pipe 23 is sealed and fixed to form a muffler, and other structures are consistent with the structure of the intake pipe muffler of the above-mentioned embodiment, which has the advantages of simple mold and less process, but the yield is low.

Claims (10)

1. a silence type car admission line system, it is characterised in that be provided with in admission line system and use suddenly The air inlet pipe acoustic filter of nurse hertz noise-cancelling theory, described air inlet pipe acoustic filter includes a core pipe, and core tube cavity is formed and is used for leading to The channel part of gas, has circumferentially been evenly arranged periphery in the middle part of some sound attenuation holes, and core pipe and has been arranged with a noise elimination in the middle part of core pipe Shell, noise elimination shell two ends and the core seal of tube arrange and are used for producing resonant silencing effect eliminating the noise to constitute between outer shell-and-core pipe Chamber portion.

2. silence type car admission line system as claimed in claim 1, it is characterised in that the side of described noise elimination shell It is designed as distance be gradually reduced three grades of core pipe distance from front to back vertically step-like, and this every section, side step of noise elimination shell Outer surface is the Irregular Boundary Surface that the round and smooth linking of multistage arcwall face is constituted in the circumferential, and noise elimination shell opposite side designs vertically It is one section of direct slope section and the one section of slope section shape rearward including forward position, and this side of noise elimination shell is multistage in the circumferential Plane be folded to be connected and junction round and smooth linking constitute be irregularly folded to joint face.

3. silence type car admission line system as claimed in claim 2, it is characterised in that described core pipe is also fixedly installed Having the two circle dividing plates stretching out and being fixedly attached to noise elimination outer casing inner wall, dividing plate outer end is connected to being folded to of noise elimination shell step Place.

4. silence type car admission line system as claimed in claim 1, it is characterised in that admission line system includes whole One end that body bending is arranged is for exporting the air filter linkage section pipeline connected, and one end that integrally bending is arranged with air filter For the electromotor linkage section pipeline connected with engine air throttle, also include being fixedly attached to air filter linkage section by clip Interlude pipeline between pipeline and electromotor linkage section pipeline, interlude pipeline material hardness is more than described air filter linkage section Pipeline and electromotor linkage section pipeline material hardness, interlude pipeline is provided with piping fixing structure and by piping fixing structure It is fixedly mounted on coachbuilt body；Described core pipe front end for being connected with air filter linkage section pipeline, core pipe rear end be used for in Between segment pipe be connected so that core tube cavity formed for ventilation channel part.

5. silence type car admission line system as claimed in claim 4, it is characterised in that described piping fixing structure bag Include one flatten after in I-shaped cutting ferrule, cutting ferrule mid portion is axially fitted on pipeline outer wall along pipeline, cutting ferrule front and rear part Point two ends, left and right along after pipeline circumferential skewing in the horizontal direction laminating be connected and constitute a suit body being attached to pipeline outer wall, and card The joint place, end, two ends, left and right of set front and rear part is provided with bolt hole；Piping fixing structure also includes curved an of entirety The support support of shape, support support one end arcuately is horizontal-extending and is correspondingly arranged on two bolts hole, and by bolt and card The bolt hole of the joint place, end, two ends, left and right of set front and rear part is fixing to be connected, and supports the support other end to outer lower side bending extension And it is provided with two bolts hole and for by being bolted to coachbuilt body along time interval.

6. silence type car admission line system as claimed in claim 4, it is characterised in that described piping fixing structure bag Include two along the most spaced journal stirrup of pipeline, journal stirrup the inner is weldingly fixed on pipeline outer wall side medium position, outward End is horizontally outer to be extended, and before and after journal stirrup, two lateral bends are backward extended, are provided with bolt hole bottom journal stirrup；Pipeline is fixed Structure also includes the support support of a curved lamellar of entirety, and support support one end arcuately is horizontal-extending and is correspondingly arranged There are two bolts hole, and connect by bolt hole corresponding bottom bolt and journal stirrup is fixing, support the support other end curved to outer lower side Qu Yanshen is also provided with two bolts hole and for by being bolted to coachbuilt body along time interval.

7. silence type car admission line system as claimed in claim 4, it is characterised in that described interlude pipeline includes It is positioned at and connects the flat segments of one end with air filter linkage section pipeline and be positioned at and connect the bending of one end with electromotor linkage section pipeline Section, described piping fixing structure is arranged in flat segments, and described bending section outer surface evagination is formed with latticed reinforcement.

8. silence type car admission line system as claimed in claim 4, it is characterised in that described interlude pipe ends Place is each provided with clamp connection structure, and clamp connection structure includes the two axially spaced settings of circle being projected and formed in pipeline periphery Clamping protruding, two circle clamping projection intermediate formation have clip mounting groove.

9. silence type car admission line system as claimed in claim 4, it is characterised in that described air filter linkage section pipe Road integrally bending is arranged, and is provided with a ripple at the front position of air filter exit position on air filter linkage section pipeline Pipeline section.

10. silence type car admission line system as claimed in claim 9, it is characterised in that side, bellows piece rear end Also being welded with one piece of outside connecting plate, connecting plate is formed with draw-in groove on outer end.