900CC displacement three-cylinder three-section impedance type special-shaped silencer

Abstract

The invention relates to the technical field of silencers, in particular to a 900CC displacement three-cylinder three-section impedance type special-shaped silencer which comprises a shell, an air inlet cover, a right partition plate, a left partition plate, a first pipeline, an air outlet cover, a second pipeline and a switching module, the air inlet cover is installed on the right side of the shell, and the right partition plate and the left partition plate are sequentially installed in the shell from right to left; the right partition plate and the left partition plate divide an inner cavity of the shell into a resisting section, a functional section and a blocking section which are rightward in sequence, the first pipeline penetrates through the right partition plate and the left partition plate, the air outlet cover is installed at the left end of the shell, the second pipeline penetrates through the left partition plate and the air outlet cover, and the switching module is installed in the functional section. The inner cavity of the silencer is divided into three sections, one section plays a role in resistance, the other section plays a role in resistance, and the other section changes the resistance function along with the running state of the motorcycle, so that the purposes of reducing resistance, enhancing resistance, enhancing the high-frequency noise elimination effect and guaranteeing the performance of the motorcycle are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of mufflers, and specifically to a 900CC displacement three-cylinder three-stage impedance type special-shaped muffler. Background Art

[0002] A 900CC displacement three-cylinder engine is commonly used in motorcycles. According to different emission values, motorcycles are often classified into types such as ultra-light, light, medium and small displacement, and large displacement. 900CC belongs to the large displacement type. During the process of engine operation, exhaust gas and vibration are generated. If these exhaust gases are directly discharged from the engine, the vibrating gas molecules will generate noise. Moreover, the working principle of a three-cylinder engine is different from that of a four-cylinder engine. Due to its fewer cylinders, the vibration generated is greater, and correspondingly, the generated noise is also greater. Therefore, a muffler is usually connected to the exhaust end of the engine.

[0003] When a motorcycle travels at different speeds, the engine operation frequency will be different. Correspondingly, the vibration frequency of the exhaust gas generated by the engine operation will also be different. Thus, the noise emitted by the engine has high-frequency and low-frequency components; usually, high-frequency noise is eliminated by resistive means (such as absorption by a porous structure), and low-frequency noise is eliminated by reactive means (such as a sudden change in the cross-section of the pipe through which the exhaust gas flows); when a motorcycle travels at a low speed, it often passes through crowds. To avoid affecting the crowds, more reactive structures are arranged inside the muffler. However, when a motorcycle travels at a high speed, the reactive structures will hinder the outflow of the exhaust gas (like a person wearing a mask while exercising), which will further cause poor exhaust of the engine and reduced performance; to avoid this phenomenon, the prior art arranges a passive valve or an active valve inside the muffler. When the motorcycle travels at a low speed, the opening of the valve is reduced to enhance the reactance of the muffler, so as to better eliminate low-frequency noise. When the motorcycle travels at a high speed, the opening of the valve is increased to reduce the reactance of the muffler, so that the exhaust gas can flow out of the muffler more smoothly, thereby avoiding a reduction in engine performance.

[0004] The prior art arranges a passive valve or an active valve inside the muffler, which not only optimizes the elimination effect of low-frequency noise but also avoids a reduction in engine performance. However, to enable the muffler to have excellent noise elimination effects both when the motorcycle travels at a high speed and a low speed, a structure with both resistive and reactive properties (such as a micro-perforated plate) is arranged inside the muffler, so as to achieve the dual elimination of high-frequency and low-frequency noise. Therefore, when the motorcycle weakens the reactance of the muffler to travel at a high speed, the resistive property of the muffler will also be weakened accordingly, which will further reduce the elimination effect of high-frequency noise. Moreover, when the motorcycle travels at a low speed, the fuel burns incompletely, and the exhaust gas discharged will be doped with oil and gas, which will quickly contaminate the porous absorption structure that plays a resistive role.

[0005] Therefore, a 900CC displacement three-cylinder three-stage impedance type special-shaped muffler is proposed. Summary of the Invention

[0006] The object of the present invention is to provide a 900CC displacement three-cylinder three-section impedance-type special-shaped muffler, which solves the problem that the resistance of the muffler decreases together with the reactance when the motorcycle is running at high speed, and the resistance section is quickly polluted when the motorcycle is running at low speed. By dividing the inner cavity of the muffler into three sections, one section plays a resistance role, one section plays a reactance role, and the other section changes the impedance role according to the running state of the motorcycle, the purpose of reducing the reactance while enhancing the resistance is achieved, so as to enhance the high-frequency noise elimination effect while ensuring the performance of the motorcycle, and avoid the contact between the exhaust gas and the filler when running at low speed, thereby prolonging the service life of the resistance section.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A 900CC displacement three-cylinder three-section impedance-type special-shaped muffler, comprising a housing, an air inlet cover, a right partition, a left partition, a first pipe, an air outlet cover, a second pipe and a switching module. The air inlet cover is installed on the right side of the housing. The right partition and the left partition are sequentially installed inside the housing from right to left, and the right partition and the left partition divide the inner cavity of the housing into a reactance section, a functional section and a resistance section that are sequentially to the right. The first pipe penetrates through the right partition and the left partition, and the left port and the right port of the first pipe are respectively inside the resistance section and the reactance section. The air outlet cover is installed at the left end of the housing. The second pipe penetrates through the left partition and the air outlet cover, and the left port and the right port of the second pipe are respectively outside the muffler and inside the functional section. The switching module is installed inside the functional section;

[0009] The special-shaped first pipe with two ends extending into the resistance section and the reactance section further reduces the noise of the gas that has eliminated the low-frequency noise through the reactance section. The second pipe discharges the gas that has eliminated the high-frequency noise through the resistance section to the outside, and the second pipe is pushed and pulled by the switching module to extend and shorten respectively when the functional section is at high pressure and low pressure, so as to increase its own resistance and reactance respectively.

[0010] Preferably, the right side of the right partition is provided with an inner conical surface structure, and the right end of the first pipe is installed at the central position of the conical surface structure of the right partition;

[0011] In the above solution, the setting of the inner conical surface on the right side of the right partition increases the contact area with the exhaust gas discharged from the air inlet cover, so as to enhance the reflection of the exhaust gas, thereby improving the reactance of the reactance section. Moreover, the setting of the inner conical surface makes the reflected exhaust gas deviate from the horizontal direction of propagation and collide at the center of the reactance section, so that the energy of the exhaust gas cancels each other out, so as to further eliminate the low-frequency noise. In addition, the setting of the conical surface also causes the horizontal pressure of the exhaust gas on the right partition to generate a vertical separation, thereby reducing the horizontal pressure of the exhaust gas on the right partition, so that the structure of the muffler is more stable.

[0012] Preferably, the intake cover includes a cover body, an intake pipe, a blocking block, and a support pillar. The cover body is connected to the right end of the housing. The intake pipe penetrates through the cover body and is coaxial with the right end of the first pipe. The left end of the intake pipe is provided with a tapered structure with a larger diameter on the left. The blocking block is located inside the tapered structure of the intake pipe. The support pillar is connected between the blocking block and the tapered structure of the intake pipe.

[0013] In the above solution, the intake pipe cooperates with the blocking block to cause the cross-section of the exhaust gas flowing through the intake pipe to mutate multiple times, so as to enhance the resistance of the resistance section, thereby better eliminating low-frequency noise. Moreover, the further cooperation of the tapered structure of the intake pipe and the blocking block can also direct the exhaust gas discharged from the intake pipe to the inner conical surface of the right partition, avoiding the exhaust gas directly entering the first pipe, thereby further enhancing the resistance of the resistance section.

[0014] Preferably, the right end of the blocking block is provided with a conical surface structure, and the support pillar is provided with a triangular prism structure with one edge facing right.

[0015] In the above solution, through the conical surface of the blocking block and the triangular prism structure of the support pillar, the resistance of the exhaust gas discharged from the engine entering the inside of the muffler is reduced, which not only makes the engine exhaust smoothly, thus ensuring the performance of the motorcycle, but also makes the connection between the blocking block and the support pillar more stable and the operation of the muffler more reliable.

[0016] Preferably, the left end of the first pipe is installed on the left partition, and the installation position of the left end of the first pipe deviates from the center of the left partition. A wind-dispersing block is connected to the right side of the air outlet cover, and the wind-dispersing block is coaxial with the left end of the first pipe.

[0017] In the above solution, the two ends of the first pipe are respectively installed on the left partition and the right partition, and the heights of the two ends are different, thereby making the first pipe deformed to have the following characteristics: 1) Longer length, thereby increasing the frictional loss during the flow of the exhaust gas to achieve a resistive effect and eliminate high-frequency noise; 2) Multiple turns, so that the exhaust gas reflects at the turning points during the flowing process to achieve a reactive effect and eliminate low-frequency noise. The wind-dispersing block arranged coaxially with the left end of the first pipe evenly diffuses the exhaust gas discharged from the first pipe inside the resistance section through its own reflection, and disperses the horizontal impact of the gas on the air outlet cover in the vertical direction, making the connection of the air outlet cover on the housing more stable and the operation of the muffler more reliable.

[0018] Preferably, the left partition includes a plate body and a perforated plate. The plate body is connected inside the housing. The perforated plate is installed on the left side of the plate body. The number of perforated plates is multiple, and the positions of the holes on the multiple perforated plates are different.

[0019] In the above solution, multiple orifice plates with different orifice positions are combined to form a porous structure, which constitutes the basic part of the resistive effect of the muffler to achieve the elimination of high-frequency noise. The advantages are as follows: 1) The positions of the holes on each orifice plate are different, so there is no need to limit the flow of exhaust gas through the orifice diameter of the holes on the orifice plate, thus avoiding the orifice plate being blocked by the exhaust gas with oil and gas; 2) The structure of the orifice plate is simple, easy to combine, and by controlling the combination quantity, the absorption ability of the resistance section to high-frequency noise can be adjusted to ensure the performance of the motorcycle while eliminating noise.

[0020] Preferably, a drainage hole is formed on the plate body. The drainage hole is located below the left end of the first pipe, and the drainage hole is arranged in a tapered hole structure with a large diameter on the left.

[0021] In the above solution, the drainage hole guides the exhaust gas that has undergone resistive treatment in the resistance section into the function section, and through the tapered setting, it accelerates the flow of the exhaust gas and enhances the reflection phenomenon of the exhaust gas during this process; setting the drainage hole below the left end of the first pipe is to raise the left end of the first pipe to further enhance the effect brought by the special-shaped structure of the first pipe, so as to better eliminate low-frequency and high-frequency noise.

[0022] Preferably, the second pipe includes an outer pipe and an inner pipe. The left end and the right end of the outer pipe are respectively installed on the air outlet cover and the left partition board. The inner pipe is slidably connected inside the outer pipe. The left end of the outer pipe is arranged in a tapered structure with a small diameter on the left, and a mesh ring is connected to the inner side of the outer pipe. Glass fiber is filled between the mesh ring and the outer pipe. The inner circle of the inner pipe is arranged in a tapered structure with a large diameter on the left, and ventilation holes are formed at the right end of the inner pipe.

[0023] In the above solution, through the cooperation of the second pipe with the first pipe and the drainage hole, the exhaust gas entering the anti-section is discharged to the outside after undergoing resistive treatment and resistance treatment. The layout of the three extends the path of the exhaust gas flow to enhance the resistive effect, and each time the exhaust gas enters and exits the three, a cross-section mutation will occur, thus enhancing the resistance effect, thereby effectively reducing the noise of a large-displacement motorcycle using a 900CC displacement three-cylinder engine; in addition, through the internal setting of the second pipe, under the cooperation of the outer pipe and the inner pipe, it shows strong resistance when the pressure inside the muffler is high (i.e., when the motorcycle is running at high speed), and shows strong resistance when the pressure inside the muffler is low (i.e., when the motorcycle is running at low speed).

[0024] Preferably, the switching module includes a cylinder block, a push rod, and a spring. The cylinder block is connected to the left end of the right partition board. The push rod is slidably connected inside the cylinder block, and the left end of the push rod is connected to the right end of the inner pipe. The spring is installed between the push rod and the right partition board.

[0025] In the above solution, the switching module serves as the power source of the inner tube, controlling the switching of the second pipeline between strong resistance and strong reactance. The switching module composed of a rod body - push rod - spring is a passive device controlled by the pressure within the functional section. Compared with an active device, in addition to achieving power transmission, it can further consume the energy of the exhaust gas through energy storage during spring compression, thereby playing a role in reducing noise.

[0026] Preferably, a yielding hole is provided on the right side of the right partition plate, and a communication hole is provided below the yielding hole. One end of the yielding hole penetrates through the yielding hole, and the other end of the communication hole leads to the outside.

[0027] In the above solution, by providing the communication hole, the yielding hole and the inner cavity of the cylinder on the right side of the push rod are communicated with the outside, so that the air pressure in the yielding hole and the inner cavity of the cylinder on the right side of the push rod is constant, so that the effect of the push rod under the action of the air pressure in the functional section is consistent, so that the second pipeline can exhibit resistance matching the driving speed of the motorcycle (the higher the speed, the higher the internal pressure of the muffler).

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] 1. The present invention designs the muffler in a three - stage manner. The two ends of the muffler play the roles of resistance and reactance respectively. The middle section of the muffler exhibits strong reactance when the motorcycle is running at a low speed to eliminate low - frequency noise. At this time, the resistance layer in the muffler is shielded to avoid contact with the exhaust gas with oil and gas, thus preventing the resistance layer from being quickly contaminated. The middle section of the muffler exhibits strong resistance when the motorcycle is running at a high speed to eliminate high - frequency noise and at the same time allow the exhaust gas to be discharged smoothly, thereby ensuring the performance of the motorcycle when running at a high speed.

[0030] 2. The present invention designs the first pipeline in a special shape. Through the height difference at both ends of the first pipeline, not only the flow path of the exhaust gas in the first pipeline is extended, thereby increasing the frictional loss along the flow of the exhaust gas to achieve the resistance effect and reduce the high - frequency noise of the exhaust gas, but also the flow path of the exhaust gas in the first pipeline has multiple bends, so that the exhaust gas is reflected multiple times during the flow process, thereby achieving the reactance effect and reducing the low - frequency noise of the exhaust gas. And through the cooperation of the first pipeline with the diversion hole and the second pipeline, the exhaust gas in the anti - section is first led to the resistance section, then the exhaust gas in the resistance section is led to the functional section, and finally the exhaust gas in the functional section is led to the outside, thereby further increasing the length of the exhaust gas flow path, enhancing the resistance effect of the muffler, and each time the exhaust gas enters and exits the first pipeline, the diversion hole or the second pipeline, it is accompanied by a sudden change in the flow cross - section, thereby enhancing the reactance effect of the muffler.

[0031] 3. In the present invention, the inner tube is slidably connected inside the outer tube. When there is high pressure and low pressure inside the muffler (i.e., when the motorcycle is running at high speed and low speed), the push rod drives the inner tube to slide to the right and left respectively, so as to achieve strong resistance and strong reactance of the second pipeline, thereby realizing the dual elimination of high-frequency noise and low-frequency noise. Moreover, the power for the rightward movement of the push rod comes from the internal pressure of the functional section, and the power for the leftward movement comes from the spring potential energy. Furthermore, through the pressure energy storage of the spring, part of the energy of the exhaust gas can also be absorbed, thus eliminating noise of a certain intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is the front right isometric structural schematic diagram of the present invention;

[0033] Figure 2 is the front right inner-sectional isometric structural schematic diagram of the present invention;

[0034] Figure 3 is the front left inner-sectional isometric structural schematic diagram of the present invention;

[0035] Figure 4 is of the present invention Figure 3 enlarged schematic diagram of part A;

[0036] Figure 5 is the orifice plate combination schematic diagram of the present invention;

[0037] Figure 6 is the schematic diagram of the state of the muffler when the motorcycle is running at low speed of the present invention;

[0038] Figure 7 is the schematic diagram of the state of the muffler when the motorcycle is running at high speed of the present invention;

[0039] Figure 8 is the assembly schematic diagram of the present invention.

[0040] In the figure: 1. housing; 11. resistance section; 12. functional section; 13. resistance section; 2. intake cover; 21. cover body; 22. intake pipe; 23. plug; 24. support pillar; 3. right partition; 31. relief hole; 32. communication hole; 4. left partition; 41. plate body; 411. drainage hole; 42. orifice plate; 5. first pipeline; 6. outlet cover; 61. wind-dispersing block; 7. second pipeline; 71. outer tube; 711. mesh ring; 712. fiberglass; 72. inner tube; 721. ventilation hole; 8. switching module; 81. cylinder block; 82. push rod; 83. spring. DETAILED DESCRIPTION OF THE INVENTION

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only a part rather than all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] Please refer to Figures 1 to 8 , the present invention provides a 900CC displacement three-cylinder three-stage impedance type special-shaped muffler, and the technical solution is as follows:

[0043] A 900CC displacement three-cylinder three-stage impedance type special-shaped muffler includes a housing 1, an air inlet cover 2, a right partition 3, a left partition 4, a first pipe 5, an air outlet cover 6, a second pipe 7, and a switching module 8. The air inlet cover 2 is installed on the right side of the housing 1. The right partition 3 and the left partition 4 are sequentially installed inside the housing 1 from right to left, and the right partition 3 and the left partition 4 divide the inner cavity of the housing 1 into an anti-section 11, a functional section 12, and a resistance section 13 that are sequentially to the right. The first pipe 5 penetrates through the right partition 3 and the left partition 4, and the left port and the right port of the first pipe 5 are respectively inside the resistance section 13 and the anti-section 11. The air outlet cover 6 is installed at the left end of the housing 1. The second pipe 7 penetrates through the left partition 4 and the air outlet cover 6, and the left port and the right port of the second pipe 7 are respectively outside the muffler and inside the functional section 12. The switching module 8 is installed inside the functional section 12;

[0044] The special-shaped first pipe 5 with both ends extending into the resistance section 13 and the anti-section 11 further reduces the noise of the gas that has eliminated low-frequency noise in the anti-section 11. The second pipe 7 discharges the gas that has eliminated high-frequency noise in the resistance section 13 to the outside, and the second pipe 7 extends and contracts respectively when the functional section 12 is at high pressure and low pressure under the pushing and pulling action of the switching module 8, so as to improve its own resistance and reactance respectively.

[0045] As an implementation manner of the present invention, referring to Figure 1 and Figure 2 , the right side of the right partition 3 is set as an inner conical surface structure, and the right end of the first pipe 5 is installed at the central position of the conical surface structure of the right partition 3; the right partition 3 is welded with a steel plate to achieve the lightweight of the overall muffler, and the first pipe 5 and the right partition 3 are connected by welding; the angle of the conical surface of the right partition 3 is determined according to the space of the anti-section 11. The larger the value, the closer the position where the exhaust gases collide with each other after reflection is to the right partition 3, so that the energy of the exhaust gases offsetting each other is greater. Correspondingly, the effect of removing low-frequency noise is also better.

[0046] As an implementation manner of the present invention, referring to Figure 3 and Figure 4, the intake cover 2 includes a cover body 21, an intake pipe 22, a plug 23, and a support 24. The cover body 21 is connected to the right end of the housing 1. The intake pipe 22 penetrates the cover body 21, and the intake pipe 22 is coaxial with the right end of the first pipe 5. The left end of the intake pipe 22 is provided with a tapered structure with a larger diameter on the left. The plug 23 is located inside the tapered structure of the intake pipe 22. The support 24 is connected between the plug 23 and the tapered structure of the intake pipe 22. The right end of the plug 23 is provided with a conical surface structure, and the support 24 is provided with a triangular prism structure with an edge facing right.

[0047] The connection steps of each component of the intake cover 2 are as follows: First, weld multiple supports 24 one by one between the plug 23 and the tapered structure of the intake pipe 22, noting that the supports 24 are arranged at equal intervals. Then, weld the intake pipe 22 to the cover body 21. Finally, weld the cover body 21 to the housing 1. In this method, the right side of the tapered structure of the intake pipe 22 is set as a cylindrical pipe. During operation, the exhaust gas discharged from the engine first passes through the cylindrical pipe, and at this time, the exhaust gas has a relatively large flow cross-section. When the exhaust gas encounters the plug 23, the flow cross-section suddenly becomes smaller, and as the exhaust gas continues to flow along the intake pipe 22, its flow cross-section continuously increases. Through the multiple changes of the flow cross-section above, the noise reduction effect of the anti-noise section 11 on low-frequency noise is enhanced.

[0048] As an embodiment of the present invention, referring to Figure 2 , the left end of the first pipe 5 is installed on the left partition 4, and the installation position of the left end of the first pipe 5 deviates from the center of the left partition 4. A wind-dispersing block 61 is connected to the right side of the air outlet cover 6, and the wind-dispersing block 61 is coaxial with the left end of the first pipe 5. The left end of the first pipe 5 is welded to the left partition 4. The greater the height difference between the two ends of the first pipe 5, the longer the length of the first pipe 5 and the greater the bending amplitude on the premise that the volume of the functional section 12 remains unchanged. Correspondingly, the resistive and reactive effects of the first pipe 5 are also stronger.

[0049] As an embodiment of the present invention, referring to Figure 3 and Figure 5 , the left partition 4 includes a plate body 41 and a perforated plate 42. The plate body 41 is connected inside the housing 1. The perforated plate 42 is installed on the left side of the plate body 41. The number of perforated plates 42 is multiple, and the positions of the holes on the multiple perforated plates 42 are different. The more the number of perforated plates 42 arranged, the smaller the gap formed by the overlap of each perforated plate 42, so that the noise reduction effect of the perforated plate 42 on high-frequency noise is better, and the aperture of the holes on the perforated plate 42 can also be set larger. Thus, on the one hand, the number of openings of a single perforated plate 42 is reduced to reduce the manufacturing cost, and on the other hand, when the exhaust gas with oil and gas passes through, the oil molecules will not block the holes on the perforated plate 42.

[0050] As an embodiment of the present invention, referring to Figure 6 and Figure 8, a drainage hole 411 is formed in the plate body 41. The drainage hole 411 is located below the left end of the first pipe 5, and the drainage hole 411 is arranged in a conical hole structure with a larger diameter on the left;

[0051] When assembling the muffler, first weld the left partition 4 - the right partition 3 - the first pipe 5 into one body. And before welding, first complete the assembly of the spring 83 and the push rod 82 inside the cylinder block 81, then place the welded body of the left partition 4 - the right partition 3 - the first pipe 5 into the housing 1, and then weld the housing 1 to the left partition 4 and the right partition 3 respectively from both ends of the housing 1. Then weld the intake pipe 22 (the plug 23 and the support column 24 have been welded) with the internal welding completed to the plate body 41, and weld the plate body 41 to the housing 1. Threaded connection is performed between the second pipe 7 and the left partition 4, and bolt connection is performed between the air outlet cover 6 and the housing 1, thereby realizing the detachable function of the second pipe 7 to facilitate the replacement of the fiberglass 712 inside the second pipe 7; The exhaust gas flow path inside the assembled muffler is referred to Figure 6 , the exhaust gas enters the anti-section 11 from the intake pipe 22, then enters the resistance section 13 along the second pipe 7. The exhaust gas in the resistance section 13 is subjected to high-frequency noise reduction by the orifice plate 42 and then discharged to the functional section 12 from the drainage hole 411. Subsequently, the exhaust gas enters the inside of the inner pipe 72 from the vent hole 721 and is discharged to the outside.

[0052] As an implementation manner of the present invention, refer to Figure 6 and Figure 7 , the second pipe 7 includes an outer pipe 71 and an inner pipe 72. The left end and the right end of the outer pipe 71 are respectively installed on the air outlet cover 6 and the left partition 4. The inner pipe 72 is slidably connected inside the outer pipe 71. The left end of the outer pipe 71 is arranged in a conical structure with a smaller diameter on the left, and a net ring 711 is connected to the inner side of the outer pipe 71. Fiberglass 712 is filled between the net ring 711 and the outer pipe 71. The inner circle of the inner pipe 72 is arranged in a conical structure with a larger diameter on the left, and a vent hole 721 is opened at the right end of the inner pipe 72; The switching module 8 includes a cylinder block 81, a push rod 82 and a spring 83. The cylinder block 81 is connected to the left end of the right partition 3. The push rod 82 is slidably connected inside the cylinder block 81, and the left end of the push rod 82 is connected to the right end of the inner pipe 72. The spring 83 is installed between the push rod 82 and the right partition 3; A retreat hole 31 is opened on the right side of the right partition 3, and a communication hole 32 is opened below the retreat hole 31. One end of the retreat hole 31 penetrates through the retreat hole 31, and the other end of the communication hole 32 leads to the outside;

[0053] The right end of the inner tube 72 is welded to the push rod 82. When the motorcycle is running at a low speed, the pressure of the exhaust gas inside the muffler is low and cannot compress the spring 83. As a result, the left end of the inner tube 72 approaches the left end of the outer tube 71. At this time, by means of the conical structure on the inner circle of the inner tube 72 and the conical structure at the left end of the outer tube 71, a sudden change in the exhaust gas flow cross-section is achieved, so that the second pipe 7 exhibits high resistance. And when running at a low speed, the fuel burns incompletely, and there will be a high content of oil and gas molecules in the exhaust gas. By blocking the fiberglass 712 with the inner tube 72, the pollution of the fiberglass 712 by the oil and gas molecules can be avoided. When the motorcycle is running at a high speed, the pressure of the exhaust gas inside the muffler increases to compress the spring 83, causing the left end of the inner tube 72 to move towards the right end of the outer tube 71, thereby exposing the fiberglass 712. Thus, with the help of the resistance of the fiberglass 712, the high-frequency noise generated when the motorcycle is running at a high speed is further removed. And during this process, the conical structure on the inner circle of the inner tube 72 is separated from the conical structure at the left end of the outer tube 71. As a result, when the exhaust gas flows through, it can be buffered to a certain extent through the mesh ring 711, and there will be no cross-section mutation as when the motorcycle is running at a low speed, so that the resistance of the second pipe 7 is reduced, making the exhaust of the exhaust gas smoother and the performance of the motorcycle more stable.

[0054] Working principle: The present invention designs the muffler in a three-section manner. The left partition 4 and the right partition 3 are used to divide the inner cavity of the housing 1 into three sections, which are, from right to left, the resistance section 11, the function section 12, and the resistance section 13. The exhaust gas discharged from the engine into the muffler eliminates the low-frequency noise through the resistance effect of the resistance section 11 and eliminates the high-frequency noise through the resistance effect of the resistance section 13. And the function section 12 can adjust its own resistance and resistance according to the working state of the engine. Thus, when the engine performs high-frequency work (i.e., the motorcycle runs at a high speed), it exhibits strong resistance to further remove the high-frequency noise. When the engine performs low-frequency work (i.e., the motorcycle runs at a low speed), it exhibits strong resistance to further remove the low-frequency noise.

[0055] Specifically, in order to enhance the effect of the resistance section 11 in removing low-frequency noise, the right side of the right partition 3 is set as an inner conical surface structure, and the left end of the intake pipe 22 is set as a conical structure with a large diameter on the left. And the plug 23 is installed inside the conical structure of the intake pipe 22. The setting of the inner conical surface on the right side of the right partition 3 not only increases the contact area between the right side of the right partition 3 and the exhaust gas discharged from the intake cover 2 to enhance the reflection of the exhaust gas, but also makes the reflected exhaust gas deviate from the horizontal direction of propagation and collide at the center of the resistance section 11, so that the energy of the exhaust gas cancels each other out. And the intake pipe 22 cooperates with the plug 23, causing the cross-section of the exhaust gas flowing through the intake pipe 22 to mutate multiple times to enhance the resistance of the resistance section 11, thereby better eliminating the low-frequency noise.

[0056] In order to enable the exhaust gas generated by the engine during operation to be discharged into the muffler more smoothly, thereby making the performance of the motorcycle more stable; the right end of the blocking block 23 is set to a conical structure, and the support column 24 is set to a triangular prism structure with one edge facing right, so as to reduce the resistance of the exhaust gas passing through the intake pipe 22;

[0057] In order to more effectively remove low-frequency and high-frequency noises during the transfer of the exhaust gas between the resistance section 11, the functional section 12, and the resistance section 13; the right end of the first pipe 5 is installed at the central position of the conical structure of the right partition 3, the left end of the first pipe 5 is installed on the left partition 4, and the installation position of the left end of the first pipe 5 deviates from the center of the left partition 4, so that the heights of both ends of the first pipe 5 are different. On the one hand, the length of the first pipe 5 is made longer, thereby increasing the frictional loss during the flow of the exhaust gas to achieve a resistive effect and eliminate high-frequency noises; on the other hand, the first pipe 5 has multiple bends, so that the exhaust gas reflects at the bends during the flowing process to achieve a reactive effect and eliminate low-frequency noises;

[0058] In order to enable the resistance section 13 to remove high-frequency noises; a plurality of orifice plates 42 are installed on the left side of the plate body 41, and the positions of the holes on the plurality of orifice plates 42 are different. By means of the gaps formed by the superposition of different orifice plates 42, the effect of a quasi-porous structure is generated, so as to absorb the energy of the exhaust gas to remove high-frequency noises. At the same time, the aperture of the orifice plate 42 can be set larger to avoid the blockage of the holes by the oil and gas molecules with a high content in the exhaust gas when the motorcycle is running at a low speed;

[0059] In order to enable the second pipe 7 to exhibit two states of strong resistance and strong reactance; the inner pipe 72 is slidably connected inside the outer pipe 71, and fiberglass 712 is filled inside the mesh ring 711. When the inner pipe 72 moves to the right, the fiberglass 712 is exposed and contacts the exhaust gas, thereby absorbing high-frequency noises. When the inner pipe 72 moves to the left, the fiberglass 712 is blocked and does not contact the exhaust gas, thereby avoiding the absorption of oil and gas and preventing its own blockage;

[0060] In order to provide the power for the second pipe 7 to switch states; the left end of the push rod 82 is connected to the right end of the inner pipe 72, and a communication hole 32 communicating with the outside is opened inside the retractable hole 31. Then, when the pressure inside the functional section 12 is high, the push rod 82 moves to the right under the action of air pressure, and when the pressure inside the functional section 12 is low, the spring 83 drives the push rod 82 to move to the left to reset.

[0061] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A 900cc three-cylinder three-stage impedance type special-shaped muffler, comprising a housing (1), characterized in that: It also comprises an air intake cover (2), a right partition plate (3), a left partition plate (4), a first pipeline (5), an air outlet cover (6), a second pipeline (7) and a switching module (8), wherein the air intake cover (2) is mounted on the right side of the housing (1), the right partition plate (3) and the left partition plate (4) are mounted inside the housing (1) from right to left in sequence, and the right partition plate (3) and the left partition plate (4) divide the inner cavity of the housing (1) into a resistance section (11), a functional section (12) and a resistance section (13) from right to left in sequence, the first pipeline (5) passes through the right partition plate (3) and the left partition plate (4), the air outlet cover (6) is mounted at the left end of the housing (1), the second pipeline (7) passes through the left partition plate (4) and the air outlet cover (6), and the switching module (8) is mounted inside the functional section (12); The first shaped pipe (5) with two ends extending into the resistance section (13) and the anti-noise section (11) respectively further reduces the noise of the gas that has eliminated low-frequency noise through the anti-noise section (11), and the second pipe (7) discharges the gas that has eliminated high-frequency noise through the resistance section (13) to the outside, and the second pipe (7) is extended and shortened respectively when the functional section (12) is at high pressure and low pressure due to the push and pull action of the switching module (8).

2. According to claim 1, a 900CC displacement three-cylinder three-stage impedance type special-shaped muffler is characterized by: The right side of the right partition plate (3) is arranged as an inner conical surface structure, and the right end of the first pipe (5) is installed at the center position of the conical surface structure of the right partition plate (3).

3. A 900CC three-cylinder three-stage impedance type special-shaped muffler according to claim 2, characterized in that: The air intake cover (2) comprises a cover body (21), an air intake pipe (22), a blocking block (23) and a support (24); the cover body (21) is connected to the right end of the housing (1); the air intake pipe (22) passes through the cover body (21); the air intake pipe (22) is coaxial with the right end of the first pipe (5); the left end of the air intake pipe (22) is arranged as a conical structure with a larger diameter on the left; the blocking block (23) is located inside the conical structure of the air intake pipe (22); and the support (24) is connected between the blocking block (23) and the conical structure of the air intake pipe (22).

4. A 900CC three-cylinder three-stage impedance type special-shaped muffler according to claim 3, characterized in that: The right end of the blocking block (23) is configured as a conical structure, and the support column (24) is configured as a triangular prism structure with one edge facing rightward.

5. According to claim 1, a 900CC displacement three-cylinder three-stage impedance type special-shaped muffler is characterized by: The left end of the first pipe (5) is mounted on the left partition plate (4), and the mounting position of the left end of the first pipe (5) deviates from the center of the left partition plate (4). The right side of the air outlet cover (6) is connected to an air dispersion block (61), and the air dispersion block (61) is coaxial with the left end of the first pipe (5).

6. According to claim 1, a 900CC displacement three-cylinder three-stage impedance type special-shaped muffler is characterized by: The left partition plate (4) comprises a plate body (41) and a perforated plate (42); the plate body (41) is connected to the inside of the shell (1); the perforated plate (42) is installed on the left side of the plate body (41); there are a plurality of perforated plates (42), and the positions of the holes on the plurality of perforated plates (42) are different.

7. A 900CC three-cylinder three-stage impedance type special-shaped muffler according to claim 6, characterized in that: The plate body (41) is provided with a drainage hole (411), the drainage hole (411) is located below the left end of the first pipe (5), and the drainage hole (411) is configured as a tapered hole structure with the larger diameter on the left.

8. According to claim 1, a 900CC displacement three-cylinder three-stage impedance type special-shaped muffler is characterized by: The second pipe (7) comprises an outer pipe (71) and an inner pipe (72); the left end and the right end of the outer pipe (71) are respectively mounted on the air outlet cover (6) and the left partition plate (4); the inner pipe (72) is slidably connected inside the outer pipe (71); the left end of the outer pipe (71) is arranged as a tapered structure with a smaller diameter on the left; a mesh ring (711) is connected to the inner side of the outer pipe (71); glass fiber (712) is filled between the mesh ring (711) and the outer pipe (71); the inner ring of the inner pipe (72) is arranged as a tapered structure with a larger diameter on the left; and a vent hole (721) is provided at the right end of the inner pipe (72).

9. A 900CC three-cylinder three-stage impedance type special-shaped muffler according to claim 8, characterized in that: The switching module (8) comprises a cylinder body (81), a push rod (82) and a spring (83); the cylinder body (81) is connected to the left end of the right partition (3); the push rod (82) is slidably connected inside the cylinder body (81), and the left end of the push rod (82) is connected to the right end of the inner tube (72); and the spring (83) is installed between the push rod (82) and the right partition (3).

10. A 900CC three-cylinder three-stage impedance type special-shaped muffler according to claim 9, characterized in that: A retreat hole (31) is provided on the right side of the right partition plate (3), a connecting hole (32) is provided below the retreat hole (31), one end of the retreat hole (31) passes through the retreat hole (31), and the other end of the connecting hole (32) leads to the outside.

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