Multifunctional portable generator set

Abstract

The invention relates to the technical field of generator sets, and discloses a multifunctional portable generator set which comprises a sound insulation shell and further comprises a buffer device arranged at the bottom of an inner cavity of the sound insulation shell, a diesel generator set is fixedly installed at the top of the buffer device, and an exhaust silencing mechanism is fixedly connected to an exhaust port in the right side of the diesel generator set. The right side of the sound insulation shell is fixedly connected with a ventilation and noise elimination mechanism, the noise elimination assembly is arranged, the baffles are arranged in the axial direction of the installation barrel at gradually-changing intervals, and the installation barrel is divided into a plurality of expansion chambers with the lengths gradually decreased in the airflow direction. When diesel engine tail gas enters the expansion chamber from the round pipe or enters the round pipe from the expansion chamber, the sectional area of the flow channel is suddenly expanded or shrunk, acoustic impedance mutation is formed, and exhaust noise is effectively reduced. In addition, due to the fact that the lengths of the expansion chambers are distributed in a gradually-changing mode, the silencing assembly can cover low-frequency noise in a wider frequency range, and the noise reduction effect on the low-frequency noise is improved.

Description

Technical Field

[0001] The invention relates to the technical field of generator sets, in particular to a multifunctional portable generator set. Background Art

[0002] In the past, traditional generator sets were limited by technology and design, and were large and heavy, making them extremely inconvenient to move, and difficult to meet the needs of emergency rescue, outdoor operations, and flexible power use in remote areas. Multifunctional portable generator sets, with their compact design and lightweight materials, have greatly reduced their size and weight, making them easy to carry and filling the market gap for flexible power use.

[0003] A Chinese patent with publication number CN221568651U discloses a portable generator set, including a box, a generator, a control panel, a support mechanism and a battery; a partition is provided in the box, and the partition divides the space in the box into a power generation cavity and a power storage cavity; the battery is installed in the power storage cavity through a battery fixing mechanism; the generator is installed in the power generation cavity through a shock absorbing structure, and is used to charge the battery; the control panel is detachably installed on the box, and the battery supplies power to the control panel; the support mechanism is retractably installed on the box, and is used to drive the box to move; a handle is provided on the upper side of the box.

[0004] However, the existing portable generator sets have obvious shortcomings. Their diesel engines generate high-decibel noise during operation, which seriously disturbs the surrounding environment. It is extremely unfavorable whether in a quiet outdoor camping site or in a noise-sensitive medical or office setting. In response to this situation, we proposed a multifunctional portable generator set. Summary of the invention

[0005] The object of the present invention is to provide a multifunctional portable generator set to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a multifunctional portable generator set, comprising a soundproof shell, a plurality of movable wheels are arranged at the bottom of the soundproof shell, and a buffer device is arranged at the bottom of the inner cavity of the soundproof shell, a diesel generator set is fixedly installed on the top of the buffer device, an exhaust silencer mechanism is fixedly connected to the right exhaust port of the diesel generator set, and a ventilation silencer mechanism is fixedly connected to the right side of the soundproof shell; The exhaust silencer mechanism includes a metal bellows, the left side of the metal bellows is bolted to the exhaust port of the diesel generator set through a flange assembly, the right side of the metal bellows is fixedly connected to an air intake assembly, the right side of the air intake assembly is fixedly connected to a silencer assembly, the right side of the silencer assembly is fixedly connected to an exhaust joint, and the right side of the exhaust joint is fixedly connected to a check pipe.

[0007] Preferably, the muffler assembly includes a mounting tube, a plurality of baffles are fixedly connected inside the mounting tube, the plurality of baffles are coaxially arranged with the mounting tube, the plurality of baffles are arranged with gradually varying spacing along the axial direction of the mounting tube, and the distances between adjacent baffles decrease successively from left to right. A perforated plate and a glass wool plate are fixedly connected successively to the inner wall of the mounting tube from the inside to the outside.

[0008] Preferably, two circular tubes are fixedly provided on the baffle plate, the two circular tubes are symmetrical about the center of the baffle plate, the circular tubes on adjacent baffle plates are arranged perpendicularly and intersectingly, a plurality of through holes with a hole diameter of 3 mm are opened on the perforated plate, the perforation rate is 20%, and the thickness of the glass wool board is 50 mm.

[0009] Preferably, the air intake assembly includes a conical cylinder with a conical hole formed inside. Four spiral guide plates are fixedly connected to the surface of the conical hole. The four spiral guide plates are evenly and symmetrically arranged about the axis of the conical cylinder. The exhaust joint is conical as a whole and has a conical hole formed inside.

[0010] Preferably, a plurality of upper hook-shaped grooves are provided at the top of the inner cavity of the check tube, and a plurality of lower hook-shaped grooves are provided at the bottom of the inner cavity of the check tube. The plurality of upper hook-shaped grooves and the plurality of lower hook-shaped grooves are evenly distributed along the axial direction of the check tube, the upper hook-shaped grooves and the lower hook-shaped grooves are staggered, and tapered holes are provided at the left and right ends of the check tube.

[0011] Preferably, the ventilation and silencer mechanism includes a square tube, and a plurality of guide components are fixedly connected to the top and bottom of the inner cavity of the square tube, respectively. The plurality of guide components are evenly arranged along the length direction of the square tube, the inclined surfaces of the guide components are arranged toward the left, and the guide components at the top and bottom are staggered. A stainless steel protective net and a shutter are fixedly connected to the right side of the square tube, and the stainless steel protective net is located on the left side of the shutter.

[0012] Preferably, the guide assembly includes an L-shaped plate and a flat plate, the L-shaped plate and the flat plate are welded together, a plurality of circular holes are opened on the surface of the flat plate, the plurality of circular holes are evenly arranged along the surface of the flat plate, a plurality of rectangular grooves are opened on one end of the flat plate facing the center of the square tube, the plurality of rectangular grooves are evenly arranged laterally along the flat plate.

[0013] Preferably, the soundproof outer shell includes a rectangular shell and a soundproof door, the soundproof door is rotatably connected to the front end of the rectangular shell through a hinge assembly, an exhaust hole and a ventilation hole are opened on the right side of the rectangular shell, the inner wall of the exhaust hole is fixedly connected to the outer surface of the mounting tube, the ventilation hole corresponds to the square tube, a multi-layer composite soundproof structure is provided on the inner wall of the rectangular shell, air interlayers are provided inside the rectangular shell and the soundproof door, and an annular protrusion is fixedly provided at the front end of the rectangular shell.

[0014] Preferably, a mounting groove is provided at one end of the soundproof door close to the rectangular shell, the cross-sectional shape of the mounting groove matches the annular protrusion to form a labyrinth sealing structure, and a NdFeB magnetic strip and a sealing strip are fixedly installed on the bottom surface of the mounting groove in sequence from the inside to the outside.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The multifunctional portable generator set is provided with a silencer assembly, and the baffles are arranged at a gradual interval along the axial direction of the mounting tube, so as to divide the mounting tube into a plurality of expansion chambers of gradually decreasing lengths along the airflow direction. When the diesel engine exhaust enters the expansion chamber from the circular tube or from the expansion chamber into the circular tube, the cross-sectional area of ​​the flow channel suddenly expands or contracts, forming a sudden change in acoustic impedance, causing the sound waves to reflect and interfere at the interface, thereby blocking the propagation of sound energy and effectively reducing exhaust noise. In addition, since the length of the expansion chamber is gradually distributed, the silencer assembly can cover a wider frequency range of low-frequency noise, thereby improving the noise reduction effect on low-frequency noise.

[0016] 2. The multifunctional portable generator set is provided with a check pipe. When the diesel engine is exhausted, the exhaust gas flows out of the check pipe along the inclined waves of the upper hook-shaped groove and the lower hook-shaped groove. In this process, the sound wave is constantly reflected and refracted in the waveform flow. When the reflected wave meets the incident wave, interference may occur; if the reflected wave is in opposite phase to the incident wave, the two will offset each other's energy, thereby achieving a muffler effect and further improving the noise reduction effect. In addition, the upper hook-shaped groove and the lower hook-shaped groove inside the check pipe form an asymmetric flow channel structure. When the external airflow flows in reverse, the resistance increases, thereby effectively preventing the external airflow from flowing in reverse into the exhaust muffler mechanism, avoiding interference with the noise reduction effect of the exhaust muffler mechanism.

[0017] 3. This multifunctional portable generator set is equipped with an air intake assembly. The conical hole structure of the cone effectively reduces turbulent regeneration noise and keeps the airflow flowing smoothly. The spiral guide plate is used to guide the airflow, further reduce turbulence and improve the air intake efficiency. The air intake assembly allows the exhaust gas to flow smoothly into the silencer assembly, avoiding the formation of turbulence in the exhaust gas, thereby preventing the generation of turbulent noise.

[0018] 4. The multifunctional portable generator set is provided with a metal bellows, which can effectively absorb the vibration of the diesel engine, prevent the vibration caused by the reciprocating motion of the diesel engine piston from being transmitted to the mounting tube and amplified by the mounting tube, and avoid the formation of a secondary noise source.

[0019] 5. This multifunctional portable generator set effectively absorbs medium and high frequency noise in the exhaust gas by setting perforated plates and glass wool plates; combined with the structural design of baffles and round tubes, the silencer component can absorb high, medium and low frequency noise at the same time, improving the noise reduction effect.

[0020] 6. The multifunctional portable generator set is provided with a ventilation and silencer mechanism. When the noise in the device flows from the ventilation hole to the ventilation and silencer mechanism, the noise is reflected back and forth between the guide components. By extending the sound wave reflection path, broadband attenuation is achieved, effectively preventing the noise from escaping from the ventilation hole, and further improving the noise reduction effect of the device.

[0021] 7. The multifunctional portable generator set is provided with an L-shaped plate and a flat plate. A plurality of circular holes are opened on the surface of the flat plate. A closed cavity is formed between the L-shaped plate and the flat plate. When the exhaust gas flows through the circular holes, it interacts with the closed cavity to achieve efficient noise reduction based on the Helmholtz resonance principle.

[0022] 8. The multifunctional portable generator set adopts a multi-layer composite sound insulation structure through the soundproof shell, the inner wall of the rectangular shell and the soundproof door, and an air interlayer is provided inside to effectively absorb and block the propagation of noise. In addition, NdFeB magnetic strips and sealing strips are installed at the connection between the rectangular shell and the soundproof door to further enhance the sealing performance, prevent noise from escaping from the rectangular shell, the soundproof door and the gap between the two, and improve the noise reduction effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a cross-sectional view of the overall structure of the present invention; Figure 3 It is a schematic diagram of the structure of the exhaust muffler mechanism of the present invention; Figure 4 It is a cross-sectional view of the air intake assembly, the muffler assembly and the exhaust joint of the present invention; Figure 5 For the present invention Figure 4 A magnified view of middle; Figure 6 It is a cross-sectional view of the check pipe of the present invention; Figure 7 It is a cross-sectional view of the ventilation and silencer mechanism of the present invention; Figure 8 is a cross-sectional view of the flow guide assembly of the present invention; Fig. 9 This is an exploded view of the sound insulation housing of the present invention; Fig.10 For the present invention Fig. 9 Enlarged view of B.

[0024] In the figure: 1, soundproof housing; 101, rectangular shell; 102, soundproof door; 103, exhaust hole; 104, ventilation hole; 105, annular protrusion; 106, mounting groove; 107, NdFeB magnetic strip; 108, sealing strip; 2. Exhaust silencer mechanism; 201. Metal bellows; 202. Air intake assembly; 2021. Cone; 2022. Spiral guide plate; 2023. Cone hole; 203. Silencer assembly; 2031. Mounting cylinder; 2032. Baffle; 2033. Perforated plate; 2034. Glass wool board; 2035. Round tube; 204. Exhaust joint; 205. Check pipe; 206. Upper hook-shaped groove; 207. Lower hook-shaped groove; 3. Ventilation and silencer mechanism; 301. Square tube; 302. Stainless steel protective net; 303. Shutter; 304. Diversion assembly; 3041. L-shaped plate; 3042. Flat plate; 3043. Round hole; 3044. Rectangular groove; 4. Diesel generator set; 5. Buffer device; 6. Moving wheels. DETAILED DESCRIPTION

[0025] 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.

[0026] For example, see Figure 1-6 The present invention provides a technical solution: a multifunctional portable generator set, including a soundproof shell 1, a plurality of moving wheels 6 are provided at the bottom of the soundproof shell 1, and the moving wheels 6 are used for easy movement, so that the generator set is easy to carry and transport. It also includes a buffer device 5 arranged at the bottom of the inner cavity of the soundproof shell 1, and a diesel generator set 4 is fixedly installed on the top of the buffer device 5. The buffer device 5 can effectively absorb the vibration of the diesel generator set 4 during operation, and play a role in buffering and noise reduction. The exhaust port on the right side of the diesel generator set 4 is fixedly connected to an exhaust silencer mechanism 2, and the right side of the soundproof shell 1 is fixedly connected to a ventilation silencer mechanism 3.

[0027] The exhaust silencer mechanism 2 includes a metal bellows 201, the left side of the metal bellows 201 is bolted to the exhaust port of the diesel generator set 4 through a flange assembly, and the right side of the metal bellows 201 is fixedly connected to an intake assembly 202. The metal bellows 201 can effectively absorb the vibration of the diesel engine, prevent the vibration caused by the reciprocating motion of the diesel engine piston from being transmitted to the mounting cylinder 2031 and amplified by the mounting cylinder 2031, and avoid forming a secondary noise source. The right side of the intake assembly 202 is fixedly connected to a silencer assembly 203, the right side of the silencer assembly 203 is fixedly connected to an exhaust joint 204, and the right side of the exhaust joint 204 is fixedly connected to a check pipe 205.

[0028] The muffling component 203 includes an installation cylinder 2031. Inside the installation cylinder 2031, a plurality of baffles 2032 are fixedly connected. The plurality of baffles 2032 are coaxially arranged with the installation cylinder 2031, and the plurality of baffles 2032 are arranged with gradually varying intervals along the axial direction of the installation cylinder 2031. From left to right, the distance between adjacent baffles 2032 decreases in sequence. The baffles 2032 divide the installation cylinder 2031 into a plurality of expansion chambers with gradually decreasing lengths along the air flow direction. When the diesel engine exhaust gas enters the expansion chamber from the round pipe 2035 or enters the round pipe 2035 from the expansion chamber, the cross-sectional area of the flow passage suddenly expands or contracts, forming a sudden change in acoustic impedance, causing the sound wave to reflect and interfere at the interface, thereby blocking the propagation of sound energy and effectively reducing the exhaust noise. In addition, due to the gradually varying distribution of the lengths of the expansion chambers, the muffling component 203 can cover low-frequency noises in a wider frequency range and improve the noise reduction effect on low-frequency noises. The inner wall of the installation cylinder 2031 is fixedly connected with a perforated plate 2033 and a glass wool board 2034 in sequence from the inside to the outside.

[0029] Two round pipes 2035 are fixedly arranged on the baffle 2032. The two round pipes 2035 are centrosymmetric about the center of the baffle 2032. The round pipes 2035 on adjacent baffles 2032 are arranged perpendicular to each other, preventing the sound wave emitted from the previous round pipe 2035 from directly penetrating through the next round pipe 2035 and enhancing the reflection and interference effect. A plurality of through holes with a pore diameter of 3 mm are formed on the perforated plate 2033, and the perforation rate is 20%. The thickness of the glass wool board 2034 is 50 mm. The perforated plate 2033 and the glass wool board 2034 effectively absorb the medium and high-frequency noises in the exhaust gas; combined with the structural design of the baffle 2032 and the round pipes 2035, the muffling component 203 can absorb high, medium, and low-frequency noises simultaneously and improve the noise reduction effect.

[0030] The intake component 202 includes a conical cylinder 2021. A conical hole 2023 is formed inside the conical cylinder 2021. Four spiral guide vanes 2022 are fixedly connected to the surface of the conical hole 2023. The four spiral guide vanes 2022 are evenly symmetrically arranged about the axis of the conical cylinder 2021. The exhaust joint 204 is integrally conical and has a conical hole inside. The conical hole 2023 effectively reduces the turbulent regeneration noise and keeps the air flow flowing smoothly; the spiral guide vanes 2022 are used to guide the air flow, further reducing the turbulence and improving the intake efficiency. The intake component 202 enables the exhaust gas to flow smoothly into the muffling component 203, preventing the exhaust gas from forming turbulence, thereby preventing the generation of turbulent noise.

[0031] At the top of the inner cavity of the check valve pipe 205, a plurality of upper hook-shaped grooves 206 are provided. At the bottom of the inner cavity of the check valve pipe 205, a plurality of lower hook-shaped grooves 207 are provided. The plurality of upper hook-shaped grooves 206 and the plurality of lower hook-shaped grooves 207 are evenly distributed along the axial direction of the check valve pipe 205. The upper hook-shaped grooves 206 and the lower hook-shaped grooves 207 are arranged staggeredly. Tapered holes are provided at both the left and right ends of the check valve pipe 205. When the diesel engine exhausts, the exhaust gas fluctuates and flows out of the check valve pipe 205 along the inclined surfaces of the upper hook-shaped grooves 206 and the lower hook-shaped grooves 207. During this process, sound waves are continuously reflected and refracted during the waveform flow. When the reflected wave meets the incident wave, an interference phenomenon may occur; if the phases of the reflected wave and the incident wave are opposite, the two cancel out part of the energy with each other, thereby achieving a noise elimination effect and further improving the noise reduction effect. In addition, the upper hook-shaped grooves 206 and the lower hook-shaped grooves 207 inside the check valve pipe 205 form an asymmetric flow channel structure, and the resistance increases when the external air flow reversely flows in, thereby effectively preventing the external air flow from reversely flowing into the exhaust silencing mechanism 2 and avoiding interfering with the noise reduction effect of the exhaust silencing mechanism 2.

[0032] Working principle: When the diesel engine is working, the reciprocating motion of the diesel engine piston will generate vibration and discharge high-temperature and high-speed exhaust gas. The metal bellows 201 freely expands and contracts within a certain range through its flexible structure, absorbs and buffers the vibration energy from the diesel engine, effectively prevents the vibration from being transmitted to other components of the exhaust silencing mechanism 2, and avoids the vibration amplification to form a secondary noise source.

[0033] The high-speed exhaust gas enters the conical cylinder 2021 through the metal bellows 201, flows through the tapered hole 2023 and under the guiding action of the spiral guide plate 2022, and smoothly flows into the installation cylinder 2031. The design of the tapered hole 2023 and the spiral guide plate 2022 reduces the air flow turbulence and avoids the generation of turbulence noise.

[0034] The exhaust gas enters the expansion chamber between the two baffles 2032 through the round pipe 2035. The sound waves are reflected and interfered multiple times in the expansion chamber, and the sound wave intensity gradually decreases. Subsequently, the exhaust gas enters the next expansion chamber through the round pipe 2035 again, repeating the above reflection and interference process. Since the baffles 2032 are arranged at a gradually changing spacing along the axial direction of the installation cylinder 2031, the installation cylinder 2031 is divided into a plurality of expansion chambers with gradually decreasing lengths along the air flow direction. Each expansion chamber reduces the noise of different frequencies, thereby broadening the noise reduction frequency range and improving the noise reduction effect on low-frequency noise.

[0035] The perforated plate 2033 forms a sound wave incident channel through its dense micropores. High-frequency sound waves, due to their short wavelengths, are easily passed through the micropores into the glass wool board 2034. The porous structure of the glass wool board 2034 converts the sound energy into heat energy through the viscous friction and heat conduction effects, and effectively absorbs the high-frequency noise in the exhaust gas.

[0036] The tail gas after noise reduction by the noise elimination component 203 smoothly flows into the check valve pipe 205 through the tapered hole of the exhaust joint 204. The tail gas fluctuates and flows out of the check valve pipe 205 along the inclined surfaces of the upper hook-shaped groove 206 and the lower hook-shaped groove 207. During this process, sound waves continuously reflect and refract in the waveform flow. When the reflected wave meets the incident wave, an interference phenomenon may occur; if the phases of the reflected wave and the incident wave are opposite, the two cancel out part of the energy with each other, thereby achieving the noise elimination effect and further improving the noise reduction effect.

[0037] When the external airflow containing pollutants attempts to enter the check valve pipe 205, a part of the airflow flows back under the guidance of the arc surfaces of the upper hook-shaped groove 206 and the lower hook-shaped groove 207 and collides with the original airflow, preventing the airflow from continuing to move. This design based on the Tesla valve principle effectively prevents the external airflow from entering the exhaust noise elimination mechanism 2 and avoids interfering with the noise reduction effect of the exhaust noise elimination mechanism 2.

[0038] Embodiment 2, the distinguishing features from Embodiment 1: As Figure 7-8 , the ventilation noise elimination mechanism 3 includes a square cylinder 301. A plurality of flow guiding components 304 are fixedly connected to the top and bottom of the inner cavity of the square cylinder 301 respectively. The plurality of flow guiding components 304 are evenly arranged along the length direction of the square cylinder 301. The inclined surfaces of the flow guiding components 304 face the left side, and the flow guiding components 304 at the top and bottom are staggered. When the noise in the device flows from the ventilation hole 104 to the ventilation noise elimination mechanism 3, the noise reflects back and forth between the flow guiding components 304, and broadband attenuation is achieved by extending the sound wave reflection path, effectively preventing the noise from escaping through the ventilation hole and further improving the noise reduction effect of the device. A stainless steel protection net 302 and a shutter 303 are fixedly connected to the right side of the square cylinder 301. The stainless steel protection net 302 is located on the left side of the shutter 303. The stainless steel protection net 302 blocks small animals from entering the device through the ventilation noise elimination mechanism 3, and the shutter 303 is used to control the air intake volume and block rainwater from pouring in.

[0039] The flow guiding component 304 includes an L-shaped plate 3041 and a flat plate 3042. The L-shaped plate 3041 and the flat plate 3042 are welded and connected. A plurality of round holes 3043 are formed on the surface of the flat plate 3042. The plurality of round holes 3043 are evenly arranged along the surface of the flat plate 3042. A plurality of rectangular grooves 3044 are formed at one end of the flat plate 3042 facing the center of the square cylinder 301. The plurality of rectangular grooves 3044 are evenly arranged along the transverse direction of the flat plate 3042. When the tail gas flows through the round holes 3043, it acts together with the closed cavity formed between the L-shaped plate 3041 and the flat plate 3042, and based on the Helmholtz resonance principle, efficient noise reduction is achieved.

[0040] Working principle: When the noise inside the device enters the ventilation and noise elimination mechanism 3 through the ventilation hole 104, it is transmitted outward along the multi-folded channel composed of multiple flow guiding components 304. The noise is reflected back and forth between the flow guiding components 304, and broadband attenuation is achieved by extending the sound wave reflection path, effectively preventing the noise from escaping through the ventilation hole 104 and improving the noise reduction effect of the device. At the same time, when the noise passes through the round hole 3043 on the flat plate 3042 during the transmission process, it acts together with the closed cavity formed between the L-shaped plate 3041 and the flat plate 3042, and based on the Helmholtz resonance principle, high-efficiency noise reduction is achieved.

[0041] Embodiment 3, difference features from Embodiment 1: As Figure 9-10 , the sound insulation housing 1 includes a rectangular housing 101 and a sound insulation door 102. The sound insulation door 102 is rotatably connected to the front end of the rectangular housing 101 through a hinge assembly. An exhaust hole 103 and a ventilation hole 104 are provided on the right side of the rectangular housing 101. The inner wall of the exhaust hole 103 is fixedly connected to the outer surface of the installation cylinder 2031. The ventilation hole 104 corresponds to the square cylinder 301. A multi-layer composite sound insulation structure is provided on the inner wall of the rectangular housing 101, and the multi-layer composite sound insulation structure forms a gradient impedance structure, effectively preventing noise from being transmitted from the rectangular housing 101 to the outside. Air interlayers are provided inside both the rectangular housing 101 and the sound insulation door 102. The air interlayers, as part of the sound insulation structure, can increase the propagation loss of sound waves. When the sound waves pass through the outer layer materials of the rectangular housing 101 and the sound insulation door 102 and enter the air layer, due to the elasticity of the air, the sound waves will be reflected and attenuated multiple times, reducing the energy transmitted to the inner layer and improving the sound insulation effect. A circular protrusion 105 is fixedly provided at the front end of the rectangular housing 101.

[0042] An installation groove 106 is provided at one end of the sound insulation door 102 close to the rectangular housing 101. The cross-sectional shape of the installation groove 106 matches that of the circular protrusion 105, forming a labyrinth seal structure. A neodymium iron boron magnetic strip 107 and a sealing strip 108 are fixedly installed on the bottom surface of the installation groove 106 from the inside to the outside in sequence. The sealing strip 108 is made of flexible silica gel. A neodymium iron boron magnetic strip 107 and a sealing strip 108 are installed at the connection between the rectangular housing 101 and the sound insulation door 102, further enhancing the sealing performance, preventing noise from escaping through the rectangular housing 101, the sound insulation door 102, and the gap between the two, and improving the noise reduction effect of the device.

[0043] Working principle: The noise generated by the diesel generator set 4 spreads in all directions. After passing through the multi-layer composite sound insulation structure on the inner wall of the rectangular shell 101, this multi-layer composite sound insulation structure adopts a gradient impedance design, which can effectively absorb most of the noise energy and reduce the noise intensity. When the sound wave passes through the outer layer materials of the rectangular shell 101 and the sound insulation door 102 and enters the air layer, due to the elastic characteristics of the air, the sound wave will be reflected and attenuated multiple times in the air layer, thereby reducing the sound wave energy transmitted to the inner layer and further improving the sound insulation effect. Since there is a gap between the sound insulation door 102 and the rectangular shell 101, the sound wave may leak through this gap. To effectively solve this problem, a combined design of a neodymium iron boron magnetic strip 107 and a sealing strip 108 is adopted at the connection between the sound insulation door 102 and the rectangular shell 101. The neodymium iron boron magnetic strip 107 has a high magnetic induction intensity and can provide a strong attraction force, enabling the sound insulation door 102 to be tightly closed with the rectangular shell 101, reducing the gaps generated by vibration, thereby preventing the noise from leaking through the gaps. The sealing strip 108 has elastic characteristics and can fill the tiny gaps between the sound insulation door 102 and the rectangular shell 101. At the same time, it absorbs the vibration and sound wave energy through its own sound insulation material, further enhancing the noise reduction effect.

[0044] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multifunctional portable generator set, comprising a soundproof housing (1), wherein a plurality of movable wheels (6) are provided at the bottom of the soundproof housing (1), characterized in that: Also includes: A buffer device (5) is arranged at the bottom of the inner cavity of the soundproof housing (1), a diesel generator set (4) is fixedly installed on the top of the buffer device (5), an exhaust silencer mechanism (2) is fixedly connected to the right exhaust port of the diesel generator set (4), and a ventilation silencer mechanism (3) is fixedly connected to the right side of the soundproof housing (1); The exhaust silencer mechanism (2) comprises a metal bellows (201), the left side of the metal bellows (201) being bolted to the exhaust port of the diesel generator set (4) via a flange assembly, the right side of the metal bellows (201) being fixedly connected to an air intake assembly (202), the right side of the air intake assembly (202) being fixedly connected to a silencer assembly (203), the right side of the silencer assembly (203) being fixedly connected to an exhaust joint (204), and the right side of the exhaust joint (204) being fixedly connected to a check pipe (205).

2. The multifunctional portable generator set according to claim 1, characterized in that: The muffler assembly (203) comprises a mounting tube (2031), a plurality of baffles (2032) being fixedly connected inside the mounting tube (2031), the plurality of baffles (2032) being coaxially arranged with the mounting tube (2031), the plurality of baffles (2032) being arranged with gradually varying spacing along the axial direction of the mounting tube (2031), the distances between adjacent baffles (2032) decreasing in sequence from left to right, and a perforated plate (2033) and a glass wool plate (2034) being fixedly connected in sequence to the inner wall of the mounting tube (2031) from the inside to the outside.

3. The multifunctional portable generator set according to claim 2, characterized in that: Two circular tubes (2035) are fixedly arranged on the baffle (2032), the two circular tubes (2035) are symmetrical about the center of the baffle (2032), and the circular tubes (2035) on adjacent baffles (2032) are arranged to intersect vertically. The perforated plate (2033) is provided with a plurality of through holes with a hole diameter of 3 mm, and the perforation rate is 20%. The glass wool plate (2034) is 50 mm thick.

4. The multifunctional portable generator set according to claim 1, characterized in that: The air intake assembly (202) comprises a cone cylinder (2021), a cone hole (2023) is provided inside the cone cylinder (2021), four spiral guide plates (2022) are fixedly connected to the surface of the cone hole (2023), and the four spiral guide plates (2022) are evenly and symmetrically arranged about the axis of the cone cylinder (2021); the exhaust joint (204) is conical as a whole and has a cone hole provided inside.

5. The multifunctional portable generator set according to claim 1, characterized in that: A plurality of upper hook-shaped grooves (206) are provided at the top of the inner cavity of the non-return tube (205), and a plurality of lower hook-shaped grooves (207) are provided at the bottom of the inner cavity of the non-return tube (205). The plurality of upper hook-shaped grooves (206) and the plurality of lower hook-shaped grooves (207) are evenly distributed along the axial direction of the non-return tube (205), the upper hook-shaped grooves (206) and the lower hook-shaped grooves (207) are arranged in a staggered manner, and tapered holes are provided at the left and right ends of the non-return tube (205).

6. The multifunctional portable generator set according to claim 1, characterized in that: The ventilation and silencer mechanism (3) comprises a square tube (301), wherein a plurality of flow guide components (304) are fixedly connected to the top and bottom of the inner cavity of the square tube (301), respectively, and the plurality of flow guide components (304) are evenly arranged along the length direction of the square tube (301), the inclined surfaces of the flow guide components (304) are arranged toward the left, and the flow guide components (304) at the top and bottom are staggered, and a stainless steel protective net (302) and a louver (303) are fixedly connected to the right side of the square tube (301), and the stainless steel protective net (302) is located on the left side of the louver (303).

7. The multifunctional portable generator set according to claim 6, characterized in that: The flow guide component (304) comprises an L-shaped plate (3041) and a flat plate (3042); the L-shaped plate (3041) and the flat plate (3042) are welded together; a plurality of circular holes (3043) are provided on the surface of the flat plate (3042); the plurality of circular holes (3043) are evenly arranged along the surface of the flat plate (3042); a plurality of rectangular grooves (3044) are provided at one end of the flat plate (3042) facing the center of the square cylinder (301); the plurality of rectangular grooves (3044) are evenly arranged laterally along the flat plate (3042).

8. The multifunctional portable generator set according to claim 1, characterized in that: The soundproof housing (1) comprises a rectangular shell (101) and a soundproof door (102); the soundproof door (102) is rotatably connected to the front end of the rectangular shell (101) via a hinge assembly; an exhaust hole (103) and a ventilation hole (104) are provided on the right side of the rectangular shell (101); the inner wall of the exhaust hole (103) is fixedly connected to the outer surface of the mounting tube (2031); the ventilation hole (104) corresponds to the square tube (301); a multi-layer composite soundproof structure is provided on the inner wall of the rectangular shell (101); an air interlayer is provided inside the rectangular shell (101) and the soundproof door (102); and an annular protrusion (105) is fixedly provided at the front end of the rectangular shell (101).

9. The multifunctional portable generator set according to claim 8, characterized in that: An installation groove (106) is provided at one end of the soundproof door (102) close to the rectangular shell (101); the cross-sectional shape of the installation groove (106) matches the annular protrusion (105) to form a labyrinth seal structure; a neodymium iron boron magnetic strip (107) and a sealing strip (108) are fixedly mounted on the bottom surface of the installation groove (106) in sequence from the inside to the outside.

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