A noise suppression device for a power mechanism of a hybrid yacht

Abstract

The present invention relates to the technical field of yacht noise reduction, and specifically to a noise suppression device for a power mechanism of a hybrid power yacht, comprising a silencer arranged on the hybrid power device and a spoiler layer and a sound absorbing layer separating the hybrid power device from a hull support plate, the silencer being connected to a combustion engine of the hybrid power device to reduce the noise generated by the exhaust gas of the combustion engine, the side walls of a cabin accommodating the combustion engine on the hybrid power yacht comprising, from inside to outside, a spoiler layer, a sound absorbing layer and a hull support plate, the propagation of noise is reduced by the spoiler layer and the sound absorbing layer, the exhaust impact noise of the combustion engine is eliminated by the silencer and a noise suppression unit arranged thereon, and the conduction of noise to the engine cabin is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of yacht noise reduction, and in particular to a noise suppression device for a power mechanism of a hybrid power yacht. Background Art

[0002] The noise on a yacht can cause a lot of trouble to people. Long-term exposure to the noise environment of a yacht, especially high-intensity noise, can cause serious damage to people's hearing, and can even cause damage to the hair cells of the inner ear, causing symptoms such as hearing loss and tinnitus. In addition, the noise on a yacht is usually accompanied by vibration. Long-term vibration can loosen and wear various equipment and components on the yacht, accelerate the aging of the equipment, and the engine, generator, navigation equipment, etc. may malfunction due to noise and vibration. For some high-precision equipment, such as navigation instruments and communication equipment, noise may interfere with their normal operation and affect the accuracy and reliability of the equipment.

[0003] In the prior art, methods for reducing noise on yachts usually include installing sound insulation materials and soundproof covers in the engine compartment, and installing sound insulation materials such as sound insulation pads and sound insulation cotton on the inner wall of the engine compartment to absorb and block the noise generated by the engine. Installing a special sound insulation cover for the engine can further reduce the spread of noise. The sound insulation cover is usually composed of a metal frame and sound insulation materials, which can completely wrap the engine to block the spread of noise to the surrounding environment. In addition, installing a muffler in the exhaust system of the engine can also reduce exhaust noise. There are many types of mufflers, including resistant mufflers, resistive mufflers, etc., but it is necessary to select a suitable muffler model and installation position to ensure the muffler effect. However, the existing sound insulation pads and sound insulation materials are heavy, thick, occupy a large space, and are prone to aging. Therefore, a more effective noise suppression device for the power mechanism of a hybrid yacht is needed. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a noise suppression device for a power mechanism of a hybrid yacht, which reduces the propagation of noise through a spoiler layer and a sound-absorbing layer, eliminates the exhaust impact noise of the combustion engine through a silencer and a noise suppression part arranged thereon, and reduces the conduction of noise to the engine compartment.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A power mechanism noise suppression device for a hybrid power yacht comprises a silencer arranged on the hybrid power device, and a spoiler layer and a sound absorbing layer separating the hybrid power device from a hull support plate, the silencer is connected to a combustion engine of the hybrid power device to reduce the noise generated by the exhaust gas of the combustion engine, the combustion engine is connected to a speed change mechanism located outboard through a hybrid power transmission mechanism, the hybrid power transmission mechanism is arranged to penetrate the hull support plate, and the speed change mechanism is connected to a propeller transmission; the side wall of a cabin accommodating the combustion engine on the hybrid power yacht comprises a spoiler layer, a sound absorbing layer and a hull support plate in sequence from inside to outside, the spoiler layer is a porous structure and can stabilize the airflow in the cabin and reduce noise transmission, the sound absorbing layer is a sandwich structure with holes and can capture noise into the holes inside the sound absorbing layer; a plurality of noise suppression parts are also arranged on the outer shell of the silencer, and the noise suppression parts are used to prevent the transmission of noise from the silencer to the cabin.

[0007] Furthermore, the substrate of the spoiler layer is provided with regularly arranged guide holes, the guide holes are inclined relative to the end surface of the substrate, the hole walls of the guide holes are uneven, and the sound waves of the noise are reflected and weakened after entering the guide holes.

[0008] Furthermore, the guide hole is composed of a plurality of ball segments connected end to end in sequence, and the ball segment is the remaining part after the guide hole is cut off from a sphere with a diameter larger than the diameter of the guide hole, and the spherical surface of the ball segment can reflect the sound wave toward the center of the ball segment, thereby suppressing its propagation in the extension direction of the guide hole; two adjacent guide holes are provided with grooves connecting the entrances of the two guide holes at the end surface position of the substrate.

[0009] Furthermore, the sound-absorbing layer includes an inner solid plywood, an outer solid plywood, and a sandwich layer composed of topological units arranged between the inner solid plywood and the outer solid plywood; the topological unit has a hexagonal structure, and a sound-absorbing hole is arranged in the middle of the topological unit. The sound-absorbing hole is a centrally symmetrical structure of an irregular shape, which can capture the noise transmitted to the sound-absorbing hole and reduce the transmission of noise between the inner solid plywood and the outer solid plywood.

[0010] Furthermore, the cross-sectional profile of the sound-absorbing hole includes an arc segment protruding from each side of the inner hexagon at the first level of the inner hexagon, and an angle segment located on the inner hexagon is located between two adjacent arc segments; the shape of the arc segment is determined by the following formula: the distance from a point on the arc segment to the corresponding side of the inner hexagon is ; Where x is the distance from the point on the arc segment to the perpendicular bisector of the corresponding inner hexagon side, is a smoothing constant, the exponential constant i is 2, 3, 4, ... n, and H is the distance from the vertex of the arc segment to the corresponding outer wall of the topological unit.

[0011] Furthermore, the silencer device includes a shell, an outlet pipe, an inlet pipe, a spacer assembly, a convection silencer hole and a noise suppression part arranged on the shell; the shell includes an upper shell and a lower shell, the outlet pipe, the inlet pipe and the spacer assembly are assembled in the lower shell, the upper shell and the lower shell form a closed space to realize the exchange of exhaust gas between the inlet pipe and the outlet pipe to weaken the impact noise of the exhaust gas; the spacer assembly divides the closed space in the shell into a plurality of exchange spaces, the inlet pipe passes through the spacer assembly and extends into one end of the closed space, the outlet pipe passes through the spacer assembly and extends into the other end of the closed space, after the exhaust gas is discharged from the inlet of the inlet pipe and enters the closed space, it needs to pass through the spacer assembly to reach the inlet of the outlet pipe.

[0012] Furthermore, the partition assembly includes a first partition and a second partition arranged in parallel, and the first partition and the second partition divide the enclosed space in the shell into a first exchange space, a second exchange space and a third exchange space; after the air inlet pipe passes through the first partition and the second partition, the outlet of the air inlet pipe extends into the third exchange space, and after the air outlet pipe passes through the second partition and the first partition, the outlet of the air outlet pipe extends into the first exchange space; a plurality of groups of arranged convection silencer holes are arranged on the first partition and the second partition, and a plurality of groups of convection silencer holes are arranged on the first outlet section of the air inlet pipe located in the first exchange space and the second outlet section of the air inlet pipe located in the second exchange space, and a plurality of groups of convection silencer holes are arranged on the air inlet section of the air outlet pipe of the air outlet pipe located in the second exchange space.

[0013] Furthermore, the convection silencer hole includes a forward hemisphere and a reverse hemisphere arranged in pairs, and an air vent arranged at the root of the forward hemisphere and the reverse hemisphere. The forward hemisphere and the reverse hemisphere can change the direction of the air flow through the air vent, so that the air flow passing through the forward hemisphere and the air flow passing through the reverse hemisphere flow in opposite directions, thereby offsetting the impact of the air flow and reducing noise.

[0014] Furthermore, the noise suppression part includes a bottom plate, a suppression unit, a silencer step and a sound capture chamber. The bottom plate of the noise suppression part is fixed on the upper shell. A plurality of suppression units are stacked on the bottom plate. The suppression unit is disc-shaped as a whole. The thickness of the suppression unit gradually increases from the center to the surrounding areas, so that a closed space is enclosed between the suppression unit at the bottom and the bottom plate, and between two adjacent suppression units. Refraction and resonance of sound waves are achieved in the closed space, thereby reducing the transmission of noise.

[0015] Furthermore, the suppression unit includes a plurality of annular silencer steps extending from the center to the surroundings, so that the thickness of the suppression unit gradually increases from the center to the surroundings, and the thickness of the sound-trapping cavity formed in the enclosed space gradually decreases from the center to the surroundings, which is beneficial for the sound waves to gather toward the center after being refracted by the silencer steps and form resonance in the sound-trapping cavity, thereby weakening the intensity of the sound waves.

[0016] Compared with the prior art, the present invention provides a noise suppression device for a power mechanism of a hybrid yacht, which has the following beneficial effects:

[0017] 1. The present invention arranges a spoiler layer and a sound-absorbing layer on the side wall of the power compartment of the yacht, and the spoiler layer weakens the transmission of sound waves from the power compartment to the sound-absorbing layer, and the sound-absorbing layer further captures the sound wave energy, thereby reducing the transmission of the noise of the power mechanism to the outside of the power compartment of the yacht.

[0018] 2. The present invention arranges a silencer on the combustion engine of the yacht, utilizes the silencer to reduce the impact gas discharged from the combustion engine, and arranges a plurality of convection silencer holes arranged in pairs on the gas exchange path inside the silencer, so that the convection cancels out when the airflow passes through, further eliminating the noise generated by the airflow.

[0019] 3. The present invention provides a noise suppression part on the outer shell of the silencer, and utilizes the sound-trapping cavity inside the noise suppression part to refract the sound waves transmitted inside the noise suppression part and gather toward the center of the sound-trapping cavity, so that the sound waves resonate and weaken the amplitude, thereby reducing the noise transmitted from the silencer to the power compartment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the power mechanism noise suppression device of the hybrid power yacht of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the silencing device of the present invention;

[0022] Figure 3 It is a schematic diagram of an explosion of the silencer device of the present invention;

[0023] Figure 4 It is a schematic diagram of the internal structure of the muffler of the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of the convection muffler hole of the present invention;

[0025] Figure 6 It is a structural schematic diagram of the noise suppression unit of the present invention;

[0026] Figure 7 It is a schematic structural diagram of the suppression unit of the present invention;

[0027] Figure 8 It is a schematic structural diagram of the spoiler layer of the present invention;

[0028] Fig. 9 A three-dimensional scanning structure diagram of the guide hole of the present invention;

[0029] Fig.10 It is a schematic structural diagram of the sound absorbing layer of the present invention;

[0030] Fig.11 is a schematic cross-sectional view of the sound absorbing layer of the present invention;

[0031] Fig.12 It is a schematic diagram of the structure of the sound-absorbing hole of the present invention;

[0032] In the figure:

[0033] Combustion engine 1; spoiler 2, substrate 21, guide hole 22, ball segment 220, groove 221;

[0034] Sound absorbing layer 3, topological unit 31, sound absorbing hole 32, inner hexagon 321, arc segment 322, angle segment 323, inner solid plywood 33, outer solid plywood 34; hull support plate 4;

[0035] Silencing device 5, shell 51, upper shell 511, lower shell 512, air outlet pipe 52, air outlet pipe air inlet section 521, air inlet pipe 53, first air outlet section 532, second air outlet section 531, spacing component 54, first baffle 541, second baffle 542, first exchange space 501, second exchange space 502, third exchange space 503, convection silencer hole 55, forward hemisphere 551, reverse hemisphere 552, vent hole 553;

[0036] Hybrid power transmission mechanism 6; speed change mechanism 7; propeller 8;

[0037] Noise suppression unit 9, bottom plate 91, suppression unit 90, silencing platform 92, and sound capture chamber 93. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The present invention is described in detail below with reference to the accompanying drawings. The power mechanism noise suppression device of the hybrid yacht of the present invention comprises a silencer 5 arranged on the hybrid power device and a spoiler layer 2 and a sound absorbing layer 3 separating the hybrid power device from a hull support plate 4. The silencer 5 is connected to a combustion engine 1 of the hybrid power device to reduce the noise generated by the exhaust gas of the combustion engine 1. The combustion engine 1 is connected to a speed change mechanism 7 located outboard through a hybrid power transmission mechanism 6. The hybrid power transmission mechanism 6 is arranged to penetrate the hull support plate 4. The speed change mechanism 7 is drivingly connected to the propeller 8; the side wall of the cabin accommodating the combustion engine 1 on the hybrid yacht includes a spoiler layer 2, a sound absorbing layer 3 and a hull support plate 4 from the inside to the outside, the spoiler layer 2 is a porous structure and can stabilize the airflow in the cabin and reduce noise transmission, the sound absorbing layer 3 is a sandwich structure with holes and can capture noise into the holes inside the sound absorbing layer 3; a plurality of noise suppression parts 9 are also arranged on the outer shell of the silencer 5, and the noise suppression parts 9 prevent the transmission of noise from the silencer 5 to the cabin.

[0040] A spoiler layer 2 and a sound absorbing layer 3 are arranged on the side wall of the power compartment of the yacht. The spoiler layer 2 weakens the sound waves transmitted from the power compartment to the sound absorbing layer 3, and the sound absorbing layer 3 further captures the sound wave energy, thereby reducing the noise of the power mechanism transmitted to the outside of the power compartment of the yacht.

[0041] According to the attached Figure 8 and 9 The substrate 21 of the spoiler layer 2 is provided with regularly arranged guide holes 22, and the guide holes 22 are inclined relative to the end surface of the substrate 21. The hole wall of the guide hole 22 is an uneven structure. After the sound waves of the noise enter the guide hole 22, they are reflected and weakened.

[0042] The guide hole 22 is composed of a plurality of ball segments 220 connected end to end in sequence. The ball segment 220 is the remaining part after the guide hole 22 is cut off from a sphere with a diameter larger than the diameter of the guide hole 22. The spherical surface of the ball segment 220 can reflect the sound wave toward the center of the ball segment 220, thereby suppressing its propagation in the extension direction of the guide hole 22. Two adjacent guide holes 22 are provided with a groove 221 connecting the entrances of the two guide holes 22 at the end surface of the substrate 21. The cross-sectional shape of the specific guide hole 22 can be a beaded structure, and each bead is a ball segment 220. Since the inner wall surface of the ball segment 220 is spherical, the sound wave will be deflected toward the center of the ball segment 220 after being reflected by the spherical inner wall of the ball segment 220, thereby causing the sound waves to cancel each other out and be weakened at the center of the ball.

[0043] According to the attached Fig.10 and 11 The sound-absorbing layer 3 includes an inner solid plywood 33, an outer solid plywood 34, and a sandwich layer composed of topological units 31 arranged between the inner solid plywood 33 and the outer solid plywood 34; the topological unit 31 has a hexagonal structure, and a sound-absorbing hole 32 is arranged in the middle of the topological unit 31. The sound-absorbing hole 32 is a centrally symmetrical structure with an irregular shape, which can capture the noise transmitted to the sound-absorbing hole 32 and reduce the transmission of noise between the inner solid plywood 33 and the outer solid plywood 34.

[0044] According to the attached Fig.12 The cross-sectional profile of the sound-absorbing hole 32 includes an inner hexagon 321 and an arc segment 322 protruding from each side of the inner hexagon 321. Between two adjacent arc segments 322 is a corner segment 323 located on the inner hexagon 321. The shape of the arc segment 322 is determined by the following formula: the distance from a point on the arc segment 322 to the corresponding side of the inner hexagon 321 is ; where x is the distance from a point on the arc segment 322 to the perpendicular bisector of the side of the corresponding inner hexagon 321, is a smoothing constant, the exponential constant i is 2, 3, 4, ... n, and H is the distance from the vertex of the arc segment 322 to the corresponding outer wall of the topological unit 31. In the embodiment of the present invention, the sound-absorbing hole 32 can be formed in the following manner: first, the inner hexagon 321 is cut off at the center of the topological unit 31, and then the shape of the arc segment 322 is cut outward on the side of each inner hexagon 321, and a portion of the angled segment 323 located on the inner hexagon 321 is retained between the arc segments 322.

[0045] See attached Figure 2-5The silencer 5 comprises a shell 51, an air outlet pipe 52, an air inlet pipe 53, a spacer assembly 54, a convection silencer hole 55 and a noise suppression part 9 arranged on the shell 51; the shell 51 comprises an upper shell 511 and a lower shell 512, the air outlet pipe 52, the air inlet pipe 53 and the spacer assembly 54 are assembled in the lower shell 512, the upper shell 511 and the lower shell 512 form a closed space to realize the exchange of exhaust gas between the air inlet pipe 53 and the air outlet pipe 52 to weaken the impact noise of the exhaust gas; the spacer assembly 54 divides the closed space in the shell 51 into a plurality of exchange spaces, the air inlet pipe 53 passes through one end of the spacer assembly 54 and extends into the closed space, the air outlet pipe 52 passes through the other end of the spacer assembly 54 and extends into the closed space, after the exhaust gas is discharged from the inlet of the air inlet pipe 53 and enters the closed space, it needs to pass through the spacer assembly 54 to reach the inlet of the air outlet pipe 52.

[0046] The spacing assembly 54 includes a first partition plate 541 and a second partition plate 542 arranged in parallel, and the first partition plate 541 and the second partition plate 542 divide the enclosed space in the shell 51 into a first exchange space 501, a second exchange space 502 and a third exchange space 503; after the air inlet pipe 53 passes through the first partition plate 541 and the second partition plate 542, the outlet of the air inlet pipe 53 extends into the third exchange space 503, and after the air outlet pipe 52 passes through the second partition plate 542 and the first partition plate 541, the The outlet of the air outlet pipe 52 extends into the first exchange space 501; a plurality of groups of arranged convection silencer holes 55 are provided on the first partition plate 541 and the second partition plate 542; a plurality of groups of convection silencer holes 55 are provided on the first air outlet section 532 of the first exchange space 501, and a plurality of groups of convection silencer holes 55 are provided on the second air outlet section 531 of the second exchange space 502; a plurality of groups of convection silencer holes 55 are provided on the air outlet pipe air inlet section 521 of the air outlet pipe of the second exchange space 502.

[0047] In an embodiment of the present invention, gas can enter the third exchange space 503 from the outlet of the air inlet pipe 53, and then enter the second exchange space 502 after passing through the convection silencer holes 55 on the second partition plate 542; in the second exchange space 502, gas can enter the second exchange space 502 from the convection silencer holes 55 on the second air outlet section 531 of the air inlet pipe 53, and the gas in the second exchange space 502 can enter the first exchange space 501 through the convection silencer holes 55 on the first partition plate 541, and can also enter the air outlet pipe 52 through the convection silencer holes 55 on the air inlet section 521 of the air outlet pipe 52; in the first exchange space 501, gas can enter the first exchange space 501 from the convection silencer holes 55 on the first air outlet section 532 of the air inlet pipe 53, and then the gas in the first exchange space 501 can enter the inlet of the air outlet pipe 52 and be discharged.

[0048] The convection silencer hole 55 includes a forward hemisphere 551 and a reverse hemisphere 552 arranged in pairs, and a vent hole 553 arranged at the root of the forward hemisphere 551 and the reverse hemisphere 552. The forward hemisphere 551 and the reverse hemisphere 552 can change the flow direction of the airflow passing through the vent hole 553, so that the airflow passing through the forward hemisphere 551 and the airflow passing through the reverse hemisphere 552 flow in opposite directions, thereby offsetting the impact of the airflow and reducing noise. Specifically, the forward hemisphere 551 and the reverse hemisphere 552 can be formed by stamping and bending, and the opening directions of the hemispheres of the forward hemisphere 551 and the reverse hemisphere 552 are opposite, so that the airflow flows in opposite directions after passing through the forward hemisphere 551 and the reverse hemisphere 552, thereby offsetting the flow rate of the gas and reducing the impact noise.

[0049] A silencer 5 is provided on the combustion engine 1 of the yacht to reduce the impact gas discharged from the combustion engine 1, and a plurality of convection silencer holes 55 arranged in pairs are provided on the gas exchange path inside the silencer 5, so that convection is offset when the airflow passes through, thereby further eliminating the noise generated by the airflow.

[0050] According to the attached Figure 6 and 7 The noise suppression part 9 includes a bottom plate 91, a suppression unit 90, a silencer platform 92 and a sound capture chamber 93. The bottom plate 91 of the noise suppression part 9 is fixed on the upper shell 511. A plurality of suppression units 90 are stacked on the bottom plate 91. The suppression unit 90 is disc-shaped as a whole. The thickness of the suppression unit 90 gradually increases from the center to the surrounding areas, so that a closed space is enclosed between the suppression unit 90 at the bottom and the bottom plate 91, and between two adjacent suppression units 90. Refraction and resonance of sound waves are achieved in the closed space, thereby reducing the transmission of noise.

[0051] The suppression unit 90 includes a plurality of annular silencer steps 92 extending from the center to the surroundings, so that the thickness of the suppression unit 90 gradually increases from the center to the surroundings, and the thickness of the sound-trapping cavity 93 formed in the enclosed space gradually decreases from the center to the surroundings, which is beneficial for the sound waves to gather toward the center after being refracted by the silencer steps 92 and form resonance in the sound-trapping cavity 93, so as to weaken the intensity of the sound waves.

[0052] A noise suppression unit 9 is provided on the outer shell of the silencer 5. The sound capture cavity 93 inside the noise suppression unit 9 is utilized to refract the sound waves transmitted therein and gather toward the center of the sound capture cavity 93, so that the sound waves resonate and weaken the amplitude, thereby reducing the noise transmitted from the silencer 5 to the power compartment.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A noise suppression device for a power mechanism of a hybrid power yacht, comprising a silencer (5) arranged on a hybrid power device, and a spoiler layer (2) and a sound absorbing layer (3) separating the hybrid power device from a hull support plate (4), characterized in that: The silencer (5) is connected to the combustion engine (1) of the hybrid power device to reduce the noise generated by the exhaust gas of the combustion engine (1); the combustion engine (1) is connected to a speed change mechanism (7) located outside the ship via a hybrid power transmission mechanism (6); the hybrid power transmission mechanism (6) is arranged to penetrate the hull support plate (4); the speed change mechanism (7) is connected to the propeller (8); the side wall of the cabin accommodating the combustion engine (1) on the hybrid power yacht comprises, from inside to outside, a spoiler layer (2), a sound absorbing layer (3) and a hull support plate (4); the spoiler layer (2) is a porous structure and can stabilize the cabin. The sound absorbing layer (3) is a sandwich structure with holes and can capture noise into the holes inside the sound absorbing layer (3); a plurality of noise suppression parts (9) are arranged on the outer shell of the noise reduction device (5), and the noise suppression parts (9) prevent the noise from being transmitted from the noise reduction device (5) to the cabin; the base plate (21) of the spoiler layer (2) is provided with regularly arranged guide holes (22), the guide holes (22) are arranged obliquely relative to the end surface of the base plate (21), and the hole wall of the guide hole (22) is an uneven structure, so that the sound waves of the noise are reflected and weakened after entering the guide hole (22).

2. The power mechanism noise suppression device according to claim 1, characterized in that: The guide hole (22) is composed of a plurality of ball segments (220) connected end to end in sequence. The ball segment (220) is the remaining portion of a sphere having a diameter greater than the diameter of the guide hole (22) after the guide hole (22) is cut off. The spherical surface of the ball segment (220) can reflect sound waves in the direction of the center of the ball segment (220), thereby suppressing the propagation of sound waves in the extension direction of the guide hole (22). Two adjacent guide holes (22) are provided with grooves (221) at the end surface of the substrate (21) that connect the entrances of the two guide holes (22).

3. The power mechanism noise suppression device according to claim 2, characterized in that: The sound-absorbing layer (3) comprises an inner solid plywood (33), an outer solid plywood (34), and a sandwich layer formed by splicing topological units (31) arranged between the inner solid plywood (33) and the outer solid plywood (34); the topological unit (31) has a hexagonal structure, and a sound-absorbing hole (32) is arranged in the middle of the topological unit (31); the sound-absorbing hole (32) is a centrally symmetrical structure with an irregular shape, and can capture noise transmitted to the sound-absorbing hole (32), thereby reducing the transmission of noise between the inner solid plywood (33) and the outer solid plywood (34).

4. The power mechanism noise suppression device according to claim 3, characterized in that: The cross-sectional profile of the sound-absorbing hole (32) comprises an arc segment (322) protruding from each side of the inner hexagon (321) at the first level of the inner hexagon (321), and an angled segment (323) located on the inner hexagon (321) between two adjacent arc segments (322); the shape of the arc segment (322) is determined by the following formula: the distance from a point on the arc segment (322) to the corresponding side of the inner hexagon (321); wherein x is the distance from the point on the arc segment (322) to the perpendicular bisector of the corresponding side of the inner hexagon (321), is a smoothing constant, the exponential constant i has a value of 2, 3, 4, ... n, and H is the distance from the vertex of the arc segment (322) to the corresponding outer wall of the topological unit (31).

5. The power mechanism noise suppression device according to claim 4, characterized in that: The silencer (5) comprises a shell (51), an air outlet pipe (52), an air inlet pipe (53), a spacer assembly (54), a convection silencer hole (55), and a noise suppression portion (9) disposed on the shell (51); the shell (51) comprises an upper shell (511) and a lower shell (512); the air outlet pipe (52), the air inlet pipe (53), and the spacer assembly (54) are mounted in the lower shell (512); the upper shell (511) and the lower shell (512) form a closed space to achieve exhaust gas in the air inlet pipe (53) and the air outlet pipe (52). ) to weaken the impact noise of the exhaust gas; the spacer component (54) divides the enclosed space in the shell (51) into a plurality of exchange spaces; the intake pipe (53) passes through the spacer component (54) and extends into one end of the enclosed space; the outlet pipe (52) passes through the spacer component (54) and extends into the other end of the enclosed space; after the exhaust gas is discharged from the inlet of the intake pipe (53) and enters the enclosed space, it needs to pass through the spacer component (54) to reach the inlet of the outlet pipe (52).

6. The power mechanism noise suppression device according to claim 5, characterized in that: The spacer assembly (54) comprises a first partition plate (541) and a second partition plate (542) arranged in parallel, wherein the first partition plate (541) and the second partition plate (542) separate the enclosed space in the shell (51) into a first exchange space (501), a second exchange space (502) and a third exchange space (503); After the air inlet pipe (53) passes through the first baffle (541) and the second baffle (542), the outlet of the air inlet pipe (53) extends into the third exchange space (503); after the air outlet pipe (52) passes through the second baffle (542) and the first baffle (541), the outlet of the air outlet pipe (52) extends into the first exchange space (501); a plurality of groups of convection silencer holes (55) arranged in an array are provided on the first baffle (541) and the second baffle (542); a plurality of groups of convection silencer holes (55) are provided on the first air outlet section (532) of the air inlet pipe (53) located in the first exchange space (501) and a plurality of groups of convection silencer holes (55) are provided on the second air outlet section (531) of the air inlet pipe (53) located in the second exchange space (502); and a plurality of groups of convection silencer holes (55) are provided on the air outlet section (521) of the air outlet pipe of the air outlet pipe located in the second exchange space (502).

7. The power mechanism noise suppression device according to claim 6, characterized in that: The convection silencer hole (55) comprises a forward hemisphere (551) and a reverse hemisphere (552) arranged in pairs, and a vent hole (553) arranged at the root of the forward hemisphere (551) and the reverse hemisphere (552). The forward hemisphere (551) and the reverse hemisphere (552) are capable of changing the flow direction of airflow passing through the vent hole (553), so that the airflow passing through the forward hemisphere (551) and the airflow passing through the reverse hemisphere (552) flow in opposite directions, thereby offsetting the impact of the airflow and reducing noise.

8. The power mechanism noise suppression device according to claim 7, characterized in that: The noise suppression part (9) comprises a bottom plate (91), a suppression unit (90), a silencer step (92) and a sound capture chamber (93). The bottom plate (91) of the noise suppression part (9) is fixed on the upper shell (511). A plurality of suppression units (90) are stacked on the bottom plate (91). The suppression unit (90) is disc-shaped as a whole. The thickness of the suppression unit (90) gradually increases from the center to the periphery, so that a closed space is enclosed between the suppression unit (90) at the bottom and the bottom plate (91), and between two adjacent suppression units (90). Refraction and resonance of sound waves are achieved in the closed space, thereby reducing the transmission of noise.

9. The power mechanism noise suppression device according to claim 8, characterized in that: The suppression unit (90) comprises a plurality of annular sound-absorbing steps (92) extending from the center to the periphery, so that the thickness of the suppression unit (90) gradually increases from the center to the periphery, so that the thickness of the sound-absorbing cavity (93) formed in the enclosed space gradually decreases from the center to the periphery, which is conducive to the sound waves being refracted by the sound-absorbing steps (92) and gathering toward the center and forming resonance in the sound-absorbing cavity (93), thereby weakening the intensity of the sound waves.

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