Automobile airflow silencer
By designing a specific hole structure, baffle, and sound-absorbing cotton combination in the automotive airflow muffler, combined with sliding baffles and motor control, the problems of poor muffler effect and poor exhaust flow under high airflow velocity are solved, achieving rapid muffler silencing and flexible control of exhaust sound.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- WEIFANG ZHENGNAN MASCH TECH CO LTD
- Filing Date
- 2023-09-28
- Publication Date
- 2026-04-21
AI Technical Summary
Existing automotive mufflers are ineffective at reducing noise at high airflow velocities, and the obstructed airflow leads to poor exhaust flow, making it impossible to effectively control exhaust noise.
A car airflow muffler was designed. Rectangular or circular holes were opened on the outer wall of the connecting pipe and the air outlet pipe. The baffles were evenly arranged and staggered. The air vent and the air vent angle pipe were set at an angle. The inner cavity was filled with sound-absorbing cotton. The vibration of the baffles and the sound-absorbing cotton was used to cancel and absorb sound waves. Combined with the sliding baffle and the motor to control the sound wave path, multi-channel noise reduction was achieved.
It achieves rapid noise reduction at high airflow velocities, ensuring smooth airflow and effectively controlling exhaust noise, thus enhancing the driving experience.
Smart Images
Figure CN121897449A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of airflow muffler technology, and more specifically, to an automotive airflow muffler. Background Technology
[0002] A car muffler is a component used to reduce the noise generated by a motor vehicle's engine. Because the difference in length between the two pipes is equal to half the wavelength of the sound waves emitted by the car, the two sound waves interfere with each other when they are superimposed, thus reducing the sound intensity and achieving the effect of noise reduction.
[0003] Common types of mufflers include straight-through and reverse-flow types. Straight-through mufflers have low resistance, but when the airflow speed is too high, the noise absorption speed cannot be reached, which will weaken the muffler effect. Reverse-flow mufflers have a good muffler effect, but the airflow is obstructed, making the exhaust not smooth, and the exhaust sound is uncontrollable.
[0004] In view of this, we have studied and improved the existing problems to provide an automotive airflow muffler, aiming to solve the problems and improve its practical value through this technology. Summary of the Invention
[0005] The purpose of this invention is to provide an automotive airflow muffler to address the problems and shortcomings mentioned in the background art.
[0006] To achieve the above objectives, the present invention provides an automotive airflow muffler, which is achieved by the following specific technical means: A car airflow muffler includes a connecting pipe inserted into the inner wall of the inner shell's air inlet, with a rectangular or circular hole on the outer wall of the connecting pipe communicating with a first inner cavity; an air intake pipe inserted into the inner wall of the outer shell's air inlet, with the air intake pipe corresponding to the connecting pipe; the front end of the air outlet pipe passes through the outer shell's air outlet and is inserted into the inner wall of the inner shell's air outlet, with a rectangular or circular hole on the lower outer wall of the air outlet pipe communicating with the interior of the outer shell; the front end of the vent pipe is inserted into... The vent pipe is connected to the inner wall of the second connection port, and the rear end of the vent pipe is inserted into the inner wall of the third connection port; the annular partition is welded to the outer wall of the inner shell, and a rectangular vent is provided on one side of the partition; the partitions are evenly arranged and welded to the outer wall of the inner shell, and the vent positions between adjacent partitions are staggered; a venting inclined tube is welded to the upper part of the vent pipe, and the front end of the venting inclined tube is slidably sleeved onto the rear end of the connecting pipe through a clearance fit, and the venting... A first connection port is inserted into the outer wall of the front end of the air inclined tube; the sound-absorbing cotton is evenly filled inside the second inner cavity, and the sound-absorbing cotton wraps around the air pipe and the air inclined tube; the first partition has a first connection port at the upper part and a second connection port at the lower part, and the first partition is inserted into the inner wall of the inner shell, and the space between the first partition and the inner shell is the first inner cavity; the second partition has a third connection port at the lower part, and the second partition is inserted into the inner wall of the inner shell, and the space between the second partition and the first partition is the second inner cavity, and the space between the second partition and the inner shell is the third inner cavity; the outer shell is a cylindrical shell structure, and the upper part of the front end of the outer shell has an outer shell air inlet, and the upper part of the rear end of the outer shell has an outer shell air outlet; the upper part of the front end of the inner shell has an inner shell air inlet, and the upper part of the rear end of the inner shell has an inner shell air outlet; the motor is bolted to the outer wall of the inner shell, and the motor is inserted into the lead screw, and the lead screw is threadedly connected to the first partition.
[0007] As a further optimization of this technical solution, the outer walls of the vent pipe and the vent inclined pipe of the automobile airflow muffler of the present invention are provided with multiple air holes, and the vent pipe and the vent inclined pipe are set at a 35-degree angle.
[0008] As a further optimization of this technical solution, the first and second partitions of the automotive airflow muffler of the present invention are mounted on the inner wall of the inner shell by means of clearance fit and sliding mechanism, which is a sliding device.
[0009] As a further optimization of this technical solution, the ventilation oblique pipe of the automobile airflow muffler of the present invention is installed on the outer wall of the connecting pipe by a clearance fit sliding method, which is set as a sliding device.
[0010] As a further optimization of this technical solution, the outer wall of the first partition of the automotive airflow muffler of the present invention is provided with a threaded hole for cooperating with a lead screw, and the lead screw is screwed to the inner wall of the threaded hole.
[0011] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: 1. The lower outer wall of the connecting pipe and the vent pipe of the present invention has rectangular or circular holes, and the holes on the outer wall of the connecting pipe are connected to the first inner cavity, and the holes on the outer wall of the vent pipe are connected to the inside of the outer shell. The positions of the inlet pipe and the connecting pipe are corresponding. The partitions are evenly arranged and welded to the outer wall of the inner shell, and the vent positions of adjacent partitions are staggered, so that the airflow enters from one end of the inlet pipe, most of which enters the connecting pipe, and the other part of the airflow enters the vent. The sound waves oscillate and cancel each other between the partitions. The airflow flows out from the vent and enters the other end of the inner shell, and enters the vent pipe from the hole at the lower end of the vent pipe and is discharged. Most of the airflow enters the connecting pipe and is divided into two paths. One part flows into the vent pipe and the other part comes out from the hole at the lower end of the connecting pipe. The sound waves oscillate and cancel each other in the first inner cavity and enter the vent pipe. Then the airflow flows out from the vent pipe and enters the third inner cavity. The sound waves oscillate and cancel each other in the third inner cavity. The airflow is discharged from the vent pipe. The airflow is divided into multiple paths for noise reduction, the exhaust is fast, and the noise reduction speed is fast.
[0012] 2. The outer walls of the ventilation pipe and the inclined ventilation pipe of the present invention are provided with multiple ventilation holes, and the inclined ventilation pipe is set at an inclined angle, which allows the sound waves to be absorbed by the sound-absorbing cotton when the airflow passes through the ventilation pipe and the inclined ventilation pipe. In addition, the contact area between the inclined ventilation pipe and the sound-absorbing cotton is large, and it has an inclined surface with a blocking function. The sound waves can be quickly silenced when passing through the inclined ventilation pipe, and the sound-absorbing effect is better.
[0013] 3. The first and second partitions of this invention are connected to the inner wall of the inner shell as a sliding device, and the venting oblique pipe is connected to the outer wall of the connecting pipe as a sliding device; the outer wall of the first partition is provided with a threaded hole for cooperating with the lead screw, and the lead screw is screwed to the inner wall of the threaded hole. By controlling the motor, the first and second partitions can slide on the inner wall of the inner shell, which can control the size of the first inner cavity and the third inner cavity, change the sound effect during exhaust, and improve the driving experience.
[0014] 4. This invention improves an automotive airflow muffler, which has the advantages of reasonable structural design, rapid muffler operation, smooth exhaust flow, and the ability to change the exhaust sound effect, thus effectively solving the problems and shortcomings of existing technologies and equipment. Attached Figure Description
[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the exploded structure of the present invention; Figure 3 This is a cross-sectional structural diagram of the present invention; Figure 4 This is a partial structural diagram of the present invention; Figure 5 This is a schematic diagram of the airflow of the present invention.
[0016] In the diagram: outer shell 1, outer shell air inlet 101, outer shell air outlet 102, inner shell 2, inner shell air inlet 201, inner shell air outlet 202, partition 3, vent 301, first partition 4, first connection port 401, second connection port 402, second partition 5, third connection port 501, first inner cavity 6, second inner cavity 7, third inner cavity 8, air inlet pipe 9, connecting pipe 10, vent pipe 11, vent pipe 1101, motor 12, lead screw 13, air outlet pipe 14, sound-absorbing cotton 15. Detailed Implementation
[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.
[0018] Please see Figures 1 to 5 The present invention provides a specific technical implementation scheme for an automotive airflow muffler: Specifically, the outer shell 1 is a cylindrical shell structure, with an air inlet 101 at one end and an air outlet 102 at the other end; the inner shell 2 has an air inlet 201 at one end and an air outlet 202 at the other end; a partition 3 is welded to the outer wall of the inner shell 2, with a vent 301 on one side, and the partition 3 is inserted into the inner wall of the outer shell 1; the outer wall of the first partition 4 has a first connection port 401 and a second connection port 402, and the first partition 4 is inserted into the inner wall of the inner shell 2. The first partition 4 and the inner shell 2 form the first inner cavity 6; the first partition 4 and the second partition 5 are inserted into the inner wall of the inner shell 2 as a sliding device, and the venting pipe 1101 is inserted into the outer wall of the connecting pipe 10 as a sliding device; the outer wall of the first partition 4 is provided with a threaded hole for cooperating with the lead screw 13, and the lead screw 13 is screwed into the inner wall of the threaded hole. The control motor 12 can make the first partition 4 and the second partition 5 slide on the inner wall of the inner shell 2, which can control the size of the first inner cavity 6 and the third inner cavity 8, change the sound effect during exhaust, and make the driving experience better.
[0019] The second partition 5 has a third connection port 501 on its outer wall, and the second partition 5 is inserted into the inner wall of the inner shell 2. The second partition 5 and the first partition 4 form a second inner cavity 7, and the second partition 5 and the inner shell 2 form a third inner cavity 8. The air inlet pipe 9 is inserted into the inner wall of the outer shell air inlet 101. The connecting pipe 10 is inserted into the inner wall of the inner shell air inlet 201. The lower outer walls of the connecting pipe 10 and the air outlet pipe 14 have rectangular or circular holes. The holes on the outer walls of the connecting pipe 10 communicate with the first inner cavity 6, and the holes on the outer walls of the air outlet pipe 14 communicate with the inside of the outer shell 1. The positions of the air inlet pipe 9 and the connecting pipe 10 are corresponding. The partition plates 3 are evenly arranged and welded to the outer wall of the inner shell 2, and the air inlets 301 of adjacent partition plates 3 are aligned. The incorrect setup causes the airflow to enter from one end of the intake pipe 9, with most of it entering the connecting pipe 10 and the other part entering the vent 301. The sound waves oscillate and cancel each other out between the partitions 3 and 3. The airflow flows out from the vent 301 and enters the other end of the inner shell 2, then enters the vent 14 through the hole at the lower end of the vent pipe 14 and is discharged. Most of the airflow enters the connecting pipe 10 and splits into two paths. One part flows into the vent pipe 1101, and the other part comes out from the hole at the lower end of the connecting pipe 10. The sound waves oscillate and cancel each other out in the first inner cavity 6 and enter the vent pipe 11. Then the airflow flows out from the vent pipe 11 and enters the third inner cavity 8. The sound waves oscillate and cancel each other out in the third inner cavity 8 and the airflow is discharged from the vent pipe 14. The airflow is divided into multiple paths for noise reduction, resulting in rapid exhaust and fast noise reduction.
[0020] The upper end of the vent pipe 11 is provided with a venting inclined tube 1101, which is inserted into the outer wall of the connecting pipe 10. A first connection port 401 is inserted into the outer wall of the venting inclined tube 1101. Multiple air vents are provided on the outer walls of the vent pipe 11 and the venting inclined tube 1101. The venting inclined tube 1101 is set at an inclined angle, which allows the sound waves generated when the airflow passes through the vent pipe 11 and the venting inclined tube 1101 to be absorbed by the sound-absorbing cotton 15. The venting inclined tube 1101 has a large contact area with the sound-absorbing cotton 15 and has an inclined surface with a blocking function. The sound waves can be quickly silenced when passing through the venting inclined tube 1101, resulting in a better sound-absorbing effect.
[0021] One end of the vent pipe 11 is inserted into the inner wall of the second connection port 402, and the other end of the vent pipe 11 is inserted into the inner wall of the third connection port 501; the motor 12 is bolted to the outer wall of the inner shell 2, and the motor 12 is inserted into the lead screw 13, and the lead screw 13 is screwed into the inner wall of the first partition 4; the air outlet pipe 14 is inserted into the inner walls of the outer shell air outlet 102 and the inner shell air outlet 202; the interior of the second inner cavity 7 is filled with sound-absorbing cotton 15.
[0022] Working principle: Airflow enters from one end of the intake pipe 9. Most of the airflow enters the connecting pipe 10 and splits into two paths. One part flows into the venting inclined pipe 1101, where the sound waves are quickly absorbed by the sound-absorbing cotton 15. The other part of the airflow comes out from the hole at the lower end of the connecting pipe 10. The sound waves oscillate and cancel each other in the first inner cavity 6 and enter the venting pipe 11, where they are absorbed by the sound-absorbing cotton 15. Then, the airflow flows out from the venting pipe 11 and into the third inner cavity 8, where the sound waves oscillate and cancel each other. The airflow is discharged from the exhaust pipe 14. A small part of the airflow enters the vent 301, where the sound waves oscillate and cancel each other between the partitions 3. The airflow flows out from the vent 301 and into the other end of the inner shell 2, and enters the exhaust pipe 14 from the hole at the lower end of the exhaust pipe 14. The control motor 12 can change the size of the space between the first inner cavity 6 and the third inner cavity 8, thereby changing the exhaust sound.
[0023] In summary: This automotive airflow muffler features rectangular or circular holes on the lower outer walls of the connecting pipe and the exhaust pipe. The holes on the outer walls of the connecting pipe communicate with the first inner cavity, and the holes on the outer walls of the exhaust pipe communicate with the interior of the outer shell. The intake pipe and connecting pipe are positioned correspondingly. Spacing plates are evenly arranged and welded to the outer wall of the inner shell, with the air vents of adjacent spacing plates staggered. This allows airflow to enter from one end of the intake pipe, with most of it entering the connecting pipe and the remaining portion entering the air vents. Sound waves are amplified by the interaction between the spacing plates and the exhaust pipe. The vibrations between the plates cancel each other out, and the airflow flows out from the vent and enters the other end of the inner shell. It then enters the vent pipe through the hole at the lower end and exits. Most of the airflow enters the connecting pipe and splits into two paths: one flows into the inclined vent pipe, and the other exits through the hole at the lower end of the connecting pipe. The sound waves vibrate and cancel each other out in the first inner cavity before entering the vent pipe. The airflow then flows out from the vent pipe into the third inner cavity, where the sound waves vibrate and cancel each other out again. The airflow exits through the vent pipe. This multi-path airflow for noise reduction results in rapid exhaust and fast noise reduction. Multiple vent holes are provided on the outer wall of the vent pipe and the inclined vent pipe, which is set at an inclined angle. This allows the sound waves to be absorbed by the sound-absorbing cotton when the airflow passes through the vent pipe and the inclined vent pipe. The large contact area between the inclined vent pipe and the sound-absorbing cotton, along with the inclined surface with a blocking function, allows the sound waves to be quickly silenced when passing through the inclined vent pipe, resulting in better silencing effect. The first and second partitions are inserted and connected to the inner wall of the inner shell as a sliding device, and the inclined vent pipe is inserted and connected to the outer wall of the connecting pipe as a sliding device. The outer wall of the first partition has a threaded hole for cooperating with the lead screw, and the lead screw is screwed to the inner wall of the threaded hole. Controlling the motor allows the first and second partitions to slide on the inner wall of the inner shell, which can control the size of the first and third inner cavities, change the sound effect during exhaust, and improve the driving experience. Through the improvement of an automotive airflow muffler, it has the advantages of reasonable structural design, rapid silencing, smooth exhaust, and the ability to change the exhaust sound effect, thus effectively solving the problems and shortcomings of existing technologies and equipment.
[0024] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An automotive airflow muffler, comprising: Outer shell (1), outer shell air inlet (101), outer shell air outlet (102), inner shell (2), inner shell air inlet (201), inner shell air outlet (202), partition (3), vent (301), first partition (4), first connection port (401), second connection port (402), second partition (5), third connection port (501), first inner cavity (6), second inner cavity (7), third inner cavity (8), air inlet pipe (9), connecting pipe (10), vent pipe (11), vent pipe (1101), motor (12), lead screw (13), air outlet pipe (14), sound-absorbing cotton (15); Its features are: The outer shell (1) is a cylindrical shell structure, and an air inlet (101) is provided at the upper part of the front end of the outer shell (1), and an air outlet (102) is provided at the upper part of the end of the outer shell (1). The connecting pipe (10) is inserted into the inner wall of the air inlet (201) of the inner shell, and a rectangular or circular hole communicating with the first inner cavity (6) is opened on the outer wall of the connecting pipe (10). The air intake pipe (9) is inserted into the inner wall of the air inlet (101) of the outer shell, and the positions of the air intake pipe (9) and the connecting pipe (10) correspond; The front end of the vent pipe (14) passes through the vent port (102) of the outer shell and is inserted into the inner wall of the vent port (202) of the inner shell. A rectangular or circular hole that communicates with the interior of the outer shell (1) is provided on the lower outer wall of the vent pipe (14). The front end of the vent pipe (11) is inserted into the inner wall of the second connection port (402), and the rear end of the vent pipe (11) is inserted into the inner wall of the third connection port (501); a vent pipe (1101) is welded to the upper part of the vent pipe (11), and the front end of the vent pipe (1101) is sleeved on the rear end of the connecting pipe (10) by a clearance fit sliding method, and a first connection port (401) is inserted into the outer wall of the front end of the vent pipe (1101); multiple ventilation holes are opened on the outer walls of the vent pipe (11) and the vent pipe (1101), and the vent pipe (11) and the vent pipe (1101) are set at a 35-degree angle; the vent pipe (1101) is installed on the outer wall of the connecting pipe (10) by a clearance fit sliding method as a sliding device; The partition (3) is welded to the outer wall of the inner shell (2), and a rectangular vent (301) is provided on one side of the partition (3). The partitions (3) are evenly arranged and welded to the outer wall of the inner shell (2), and the vents (301) between adjacent partitions (3) are staggered. The sound-absorbing cotton (15) is evenly filled inside the second inner cavity (7), and the inside of the sound-absorbing cotton (15) is wrapped with a vent tube (11) and a vent inclined tube (1101). The first partition (4) has a first connection port (401) at the top and a second connection port (402) at the bottom. The first partition (4) is inserted into the inner wall of the inner shell (2), and a first inner cavity (6) is formed between the first partition (4) and the inner shell (2). The outer wall of the first partition (4) has a threaded hole for cooperating with the lead screw (13), and the lead screw (13) is screwed into the inner wall of the threaded hole. The lower part of the second partition (5) is provided with a third connection port (501), and the second partition (5) is inserted into the inner wall of the inner shell (2). The second partition (5) and the first partition (4) form a second inner cavity (7), and the second partition (5) and the inner shell (2) form a third inner cavity (8). The first partition (4) and the second partition (5) are mounted on the inner wall of the inner shell (2) by a clearance fit sliding method, which is a sliding device. The outer part of the first partition (4) The wall is provided with a threaded hole for cooperating with the lead screw (13), and the lead screw (13) is screwed to the inner wall of the threaded hole; the upper part of the front end of the inner shell (2) is provided with an inner shell air inlet (201), and the upper part of the rear end of the inner shell (2) is provided with an inner shell air outlet (202); the motor (12) is bolted to the outer wall of the inner shell (2), and the motor (12) is plugged into the lead screw (13), and the lead screw (13) is threaded to the first partition (4).