A wing-span power supply vehicle

Abstract

The present invention discloses a wing-span type power supply vehicle, comprising a chassis and a body, wherein the body has a body wall for noise reduction, sound absorption and sound insulation, the front and rear parts of the body are respectively provided with an air intake noise reduction system and an air exhaust noise reduction system, and the side of the body is provided with a wing panel that can be deployed and closed. Under the condition of ensuring sufficient air circulation in the body, the noise of the air intake and exhaust air flow and the propagation to the outside of the body caused by the equipment such as the generator set in the body are effectively reduced, and noise pollution to the workplace is avoided, so that the overall mute effect of the power supply vehicle is significantly improved when it is working, and at the same time, it has good air circulation performance. By arranging the wing panels that can be deployed and closed on the side of the body, the removal and overhaul and maintenance of the equipment such as the generator set are greatly facilitated, and the large equipment such as the generator set can be removed without disassembling the body, and the overhaul and maintenance are convenient, efficient, safe, stable and reliable.

Description

Technical Field

[0001] The invention relates to a power supply vehicle, in particular to a wingspan type power supply vehicle. Background Art

[0002] With the needs of national construction and development, special-purpose vehicles have become important transportation and operation equipment in economic construction, and have good development prospects. In recent years, due to the increased construction and investment needs of my country's power, telecommunications, mobile, Netcom, highways, railways, etc., power supply vehicles are used as emergency work vehicles in these industries. They are equipped with high-power generators and can be used for related emergency power work in communications, telecommunications, coal mines, and oil fields. They play a very important role in emergency repairs and power supply caused by emergencies.

[0003] The most important thing about the power supply vehicle is that it needs to be loaded with a high-power generator set. The generator set generates a lot of noise when working. At the same time, good ventilation conditions are also required. Therefore, in addition to having a good ventilation system, the ventilation system also needs to have a good noise reduction function to avoid the noise generated by the generator set being transmitted out of the car with the ventilation system and causing noise pollution to the external environment.

[0004] In addition, under certain circumstances, the generator set needs to be moved out of the car for inspection and maintenance. The traditional car body structure is not convenient for the inspection and maintenance of the generator set. During inspection and maintenance, the car body needs to be disassembled to move the generator set out, which is very inconvenient, labor-intensive, time-consuming and labor-intensive. It is also easy to damage the car body structure, causing unnecessary losses or reducing the sound insulation and noise reduction performance of the car body. Therefore, there is an urgent need for a power supply car body that can conveniently remove the generator set for inspection and maintenance without disassembling the car body, and at the same time, it must have good ventilation, cooling and noise reduction functions. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a wing-type power supply vehicle with a simple and reasonable structure, which not only has good sound insulation effect, but also has good ventilation and noise reduction function. At the same time, it can also conveniently remove the generator set for inspection and maintenance without disassembling the car body. The overall ultra-quiet effect is good and it is convenient for inspection and maintenance.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: the wingspan type power supply vehicle includes a chassis and a body, the body has a body wall for noise reduction, sound absorption and sound insulation, the front and rear parts of the body are respectively provided with an air intake noise reduction system and an exhaust noise reduction system, and the side of the body is provided with expandable and closable side wing panels.

[0007] The compartment wall and the side wing compartment panels all include a honeycomb hole plate layer, a sound-absorbing cotton layer and a noise sound insulation layer which are arranged in sequence, and have good noise reduction, sound absorption and sound insulation effects.

[0008] The top of the box body is provided with a groove, and a silencer exhaust pipe connected to a generator set arranged in the box body and an air intake pipe with a non-negative pressure air filter are arranged in the groove.

[0009] The air intake noise reduction system includes air intake louvers arranged on both sides of the front part of the compartment, and a sound absorption and noise reduction mechanism is arranged inside the air intake louvers. The sound absorption and noise reduction mechanism has at least two rows of inclined noise reduction plates, and the inclined noise reduction plates between two adjacent rows are arranged alternately but not connected to each other, so that a tortuous air flow channel is formed between the noise reduction plates, and a herringbone guide plate is arranged on the air outlet side of the sound absorption and noise reduction mechanism.

[0010] The guide plate is a suction plate with a honeycomb structure.

[0011] The exhaust noise reduction system includes an exhaust duct connected to the exhaust fan outlet of the generator set and exhaust shutters arranged on the air outlet side of the exhaust duct, the exhaust shutters are arranged on the rear wall of the compartment, the exhaust duct includes a first-level exhaust noise reduction chamber and a second-level exhaust noise reduction chamber that are interconnected, a plurality of horizontal sound-absorbing panels are arranged in the first-level exhaust noise reduction chamber, and a plurality of vertical sound-absorbing panels are arranged in the second-level exhaust noise reduction chamber.

[0012] The cross-section of the first-level exhaust noise reduction chamber is a gradually enlarging trumpet shape, and its longitudinal section along the air outlet direction is a trapezoidal structure. The length of the trapezoidal side on the air outlet side is smaller than the length of the trapezoidal side on the air inlet side. The air outlet side and the air inlet side of the first-level exhaust noise reduction chamber are offset up and down by a certain distance, and the first-level exhaust noise reduction chamber is inclined. The transverse silencer plate is almost parallel to the upper and lower surfaces of the first-level exhaust noise reduction chamber.

[0013] At least two rows of vertical silencers are arranged between the top plate and the bottom plate of the secondary exhaust noise reduction chamber, and the vertical silencers between two adjacent rows are staggered but not connected to each other, forming a tortuous air flow channel between the vertical silencers.

[0014] The surface of the sound-absorbing plate is covered with a sound-absorbing and noise-reducing layer.

[0015] The side wing box panels are hinged to the top of the box body, and a limiting frame corresponding to the edge of the side wing box panels is arranged at the inner edge of the opening on the box body corresponding to the side wing box panels, and a driving mechanism for driving the side wing box panels to expand and close is arranged between the side wing box panels and the limiting frame.

[0016] The side wing box plate is a right-angle folded edge structure, wherein the first right-angle folded edge is hinged to the top of the box body, and the second right-angle folded edge matches the side of the box body. The limiting frame has a first limiting frame and a second limiting frame corresponding to the first right-angle folded edge and the second right-angle folded edge respectively, and the first limiting frame and the second limiting frame are perpendicular to each other. An inclined notch is arranged on the outer side of the right-angle connection between the first limiting frame and the second limiting frame, and an inclined block matching the inclined notch is arranged at the right angle of the side wing box plate. The first limiting frame is a channel steel structure with an opening on the top, and the driving mechanism is a telescopic hydraulic cylinder, and the two ends of the hydraulic cylinder are respectively hinged to the first limiting frame and the inclined block.

[0017] A sealing strip is provided between the contact surface between the edge of the side wing panel and the box body and / or the limiting frame.

[0018] The sealing strip is a rubber strip or a flocking sealing strip.

[0019] There are two side wing panels, which are respectively arranged on both sides of the box body.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The power supply vehicle of the present invention adopts a compartment with a noise reduction, sound absorption and sound insulation structure, and arranges an air intake noise reduction system and an exhaust noise reduction system at the front and rear of the compartment respectively. Under the condition of ensuring sufficient air circulation in the compartment, the noise of the air intake and exhaust air flow and the transmission to the outside of the compartment caused by the equipment such as the generator set in the compartment are effectively reduced to avoid noise pollution to the workplace. At the same time, by arranging expandable and closable side wing compartment panels on the side of the compartment, the removal and overhaul and maintenance of the equipment such as the generator set are greatly facilitated, and larger equipment such as the generator set can be removed without disassembling the compartment. The air intake and exhaust system of the obtained power supply vehicle has low noise and good performance. The coordination of the compartment and the air intake and exhaust system significantly improves the overall mute effect of the power supply vehicle when it is working. At the same time, it has good air circulation performance, convenient overhaul and maintenance, and the compartment structure is not disassembled, which is safe, stable and reliable.

[0022] The compartment wall and side compartment panels of the present invention adopt a structure which includes a honeycomb hole plate layer, a sound-absorbing cotton layer and a noise sound insulation layer from the outside to the inside in sequence, and the multi-layer sound absorption and noise reduction, the honeycomb hole plate layer has a larger mesh, which can absorb more noise generated by the generator set in the compartment, and the sound-absorbing cotton layer with a smaller mesh further absorbs and reduces the noise, and finally the noise of the generator set is effectively blocked by the noise sound insulation layer, the noise decibel is greatly reduced, and the noise detection at a distance of 1 meter can be effectively lower than 50 decibels.

[0023] The air intake noise reduction system of the present invention adopts a sound-absorbing and noise-reducing mechanism with at least two rows of inclined noise reduction plates. The inclined noise reduction plates between two adjacent rows are staggered but not connected to each other, forming a tortuous airflow channel between the noise reduction plates, thereby effectively reducing the air intake noise. Under the condition of the same wind speed or air intake volume, the airflow forms a curved airflow path in the sound-absorbing and noise reduction mechanism, and the noise reduction plates effectively absorb the airflow wind noise. At the same time, the guide plates with a herringbone structure can effectively guide the airflow entering from both sides of the compartment to flow to the engine, and can effectively avoid the collision of the airflow entering from both sides, thereby increasing the airflow velocity and air intake volume. While effectively reducing the air intake noise, the air intake noise reduction system effectively absorbs the noise generated and transmitted by the engine, blocking the noise of the engine inside the compartment from propagating to the outside, thereby effectively reducing the overall noise.

[0024] The exhaust noise reduction system of the present invention adopts a first-level exhaust noise reduction chamber and a second-level exhaust noise reduction chamber to effectively achieve graded noise reduction. In the two-level exhaust noise reduction chamber, silencers with different layout directions are used to effectively achieve the tortuosity of the exhaust airflow channel. In the process of airflow flow, the silencers absorb and reduce the noise of the vibration airflow. The structure is simple and reasonable, and the exhaust noise reduction effect is good. Furthermore, the cross-section of the first-level exhaust noise reduction chamber is in the shape of a gradually enlarged trumpet mouth, which can effectively increase the cross-section of the airflow discharged by the exhaust fan of the generator set and reduce the airflow pressure. At the same time, the air outlet of the first-level exhaust noise reduction chamber is reduced in the vertical direction, which forms pressure on the airflow. The combination of the two changes the airflow form. In addition, the horizontal silencer in the first-level noise reduction exhaust chamber has a certain inclination angle, which effectively absorbs the noise of the airflow. Under the joint action, the first-level noise reduction exhaust is achieved, which can greatly reduce the noise carried by the generator set with the exhaust airflow. The airflow that has undergone the first-level noise reduction treatment enters the second-level noise reduction exhaust silo. Under the action of the vertical silencers that are staggered but not connected to each other, the airflow forms lateral twists and turns, and further reduces the noise through adsorption by at least two rows of vertical silencers, thereby further improving the noise reduction effect. The graded noise reduction is more efficient, has good air circulation, and has better effects. The noise decibel is greatly reduced, which can effectively reduce it by more than 80%.

[0025] The present invention hinges the side wing panels on the body, sets a limiting frame on the body corresponding to the edge of the side wing panels, and drives the side wing panels to be opened and closed by a hydraulic cylinder, thereby effectively realizing the function of moving the generator set in the body for inspection and maintenance by opening the side wing panels without disassembling the body. The stability of the body structure, the connection parts of the various structures of the body, and the sound insulation and noise reduction effects can be effectively guaranteed without disassembling the body, which is stable and reliable. The side wing panels adopt a right-angle folding structure and are hinged to the top of the body. On the one hand, they can effectively increase the height of the side wing panels after they are opened, making it easier for forklifts and other operating equipment to operate the generator set on one side of the body; on the other hand, it is more convenient to set the driving mechanism. Combined with the limiting frame of the channel steel structure, it is convenient to set the telescopic hydraulic cylinder in the groove of the limiting frame, and enable it to open and close the side wing panels within a shorter stroke. By setting an inclined notch at the right-angle connection of the limiting frame, and setting a corresponding matching inclined block at the right angle of the side wing panel, and by hinged connection between the hydraulic cylinder, the inclined block and the limiting frame, the hydraulic cylinder is hidden in the limiting frame when the side wing panel is closed. The structure is simple, the design is ingenious, and the sealing strip design is combined to make the box body have good sealing and sound insulation and noise reduction performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the accompanying drawings:

[0027] Figure 1 It is a schematic diagram of the top view of the structure of the present invention;

[0028] Figure 2 yes Figure 1 A schematic diagram of the partially enlarged structure at center A;

[0029] Figure 3 It is a schematic cross-sectional structure diagram of the cabin front air intake system of the present invention;

[0030] Figure 4 It is a first side view structural schematic diagram of the present invention;

[0031] Figure 5 It is a rear view structural schematic diagram of the present invention;

[0032] Figure 6 It is a second side view structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. Figure 1-6 shown.

[0034] The wing-type power supply vehicle of the present invention comprises a chassis 1 and a compartment 2 arranged on the chassis 1, a generator set 6 is arranged in the compartment 2, a groove 2-3 is provided on the top of the compartment 2, a muffler exhaust pipe 2-1 connected to the generator set 6 and an intake pipe with a negative pressure air filter element 2-2 are arranged in the groove 2-3, the compartment 2 has a compartment wall for noise reduction, sound absorption and sound insulation, an air intake noise reduction system 3 and an exhaust noise reduction system 4 are respectively arranged at the front and rear parts of the compartment 2, and a wing compartment 2 is provided on the side of the compartment 2 which can be unfolded and closed. The panel 5, the compartment wall and the side compartment panel 5 all include a honeycomb hole plate layer 2-3, a sound-absorbing cotton layer 2-2 and a noise sound insulation layer 2-1 which are arranged in sequence, and the multi-layer sound absorption and noise reduction, the honeycomb hole plate layer 2-3 has a larger mesh, which can absorb more noise generated by the generator set in the compartment 2, and the sound-absorbing cotton layer 2-2 with a smaller mesh further absorbs and reduces the noise, and finally the noise generated by the generator set 6 is effectively blocked by the noise sound insulation layer 2-1, the noise decibel is greatly reduced, and it has a good noise reduction, sound absorption and sound insulation effect.

[0035] The air intake noise reduction system 3 includes air intake louvers 3-1 arranged on both sides of the front part of the compartment 2, and a sound absorption and noise reduction mechanism 3-2 is arranged inside the air intake louvers 3-1. The sound absorption and noise reduction mechanism 3-2 has at least two rows of inclined noise reduction plates 3-2-1. The inclined noise reduction plates 3-2-1 between two adjacent rows are staggered with each other but not connected, and a tortuous air flow channel 3-2-2 is formed between the noise reduction plates 3-2-1. The air outlet side of the sound absorption and noise reduction mechanism 3-2 is provided with a herringbone guide plate 3-3, and the guide plate 3-3 is a suction plate with a honeycomb structure. The noise reduction plates 3-2-1 arranged alternately in the sound-absorbing and noise reduction mechanism 3-2 make the air inlet channel form a tortuous airflow channel. After the airflow of the same wind speed or flow enters the sound-absorbing and noise reduction mechanism 3-2, it absorbs energy through the partition to reduce noise and achieve the noise reduction function. The noise reduction plates 3-2-1 have a horizontal section and an inclined section, which are arranged on the front and rear wall panels of the sound-absorbing and noise reduction mechanism 3-2, and form a horizontal air duct section of a certain distance on the air inlet side and the air outlet side of the sound-absorbing and noise reduction mechanism 3-2. The airflow tortuously moves in the vertical direction. The honeycomb guide plate 3-3 with a herringbone structure can, on the one hand, guide the incoming airflow to avoid the collision of the airflows on both sides and form a confluence, and on the other hand, perform sound absorption and noise reduction, which not only increases the ventilation volume and the cooling effect on the generator set, but also further reduces the airflow noise, while reducing the outward propagation of the noise of the generator set 6, thereby improving the overall noise reduction effect.

[0036] The exhaust noise reduction system 4 includes an exhaust duct 4-1 connected to the air outlet of the exhaust fan of the generator set and an exhaust louver 4-2 arranged on the air outlet side of the exhaust duct 4-1, the exhaust louver 4-2 is arranged on the rear wall of the compartment 2, the exhaust duct 4-1 includes a first-level exhaust noise reduction compartment 4-1-1 and a second-level exhaust noise reduction compartment 4-1-2 which are interconnected, a plurality of horizontal sound-absorbing panels 4-1-1-1 are arranged in the first-level exhaust noise reduction compartment 4-1-1, a plurality of vertical sound-absorbing panels 4-1-2-1 are arranged in the second-level exhaust noise reduction compartment 4-1-2, and the surfaces of the horizontal sound-absorbing panels 4-1-1-1 and the vertical sound-absorbing panels 4-1-2-1 are covered with sound-absorbing and noise-reducing layers made of sound-absorbing cotton, velvet, sponge and other materials. Two-stage exhaust noise reduction treatment uses silencers with different layout directions. During the exhaust process, the silencers absorb and reduce the vibration airflow noise. The graded noise reduction is more efficient, has good air circulation, better effects, and greatly reduces the noise decibel.

[0037] Furthermore, as a preferred embodiment, the cross-section of the first-level exhaust noise reduction chamber 4-1-1 is a gradually enlarging trumpet-mouth shape, which can effectively increase the cross-section of the exhausted airflow in the horizontal direction, play a dispersing role, reduce the airflow pressure, and reduce noise energy; its longitudinal section along the air outlet direction is a trapezoidal structure, the length of the trapezoidal side on the air outlet side is smaller than the length of the trapezoidal side on the air inlet side, the air outlet side and the air inlet side of the first-level exhaust noise reduction chamber 4-1-1 are offset up and down by a certain distance, the first-level exhaust noise reduction chamber 4-1-1 is inclined, and the transverse silencer plate 4-1-1-1 is almost parallel to the upper and lower surfaces of the first-level exhaust noise reduction chamber 4-1-1. The spacing distance between two adjacent transverse silencer plates 4-1-1-1 on the air inlet side or the air outlet side of the first-level exhaust noise reduction chamber 4-1-1 is the same, that is, the air outlet of the first-level exhaust noise reduction chamber 4-1-1 has a decreasing trend in the vertical direction, which forms a compressive trend on the airflow in the vertical direction, and combines with the horizontal space release to change the airflow pattern. In addition, the transverse silencer plates 2-1-1 have a certain inclination angle, which effectively absorbs noise from the airflow, and together achieves first-level noise reduction exhaust.

[0038] At least two rows of vertical silencers 4-1-2-1 are arranged between the top plate and the bottom plate of the secondary exhaust noise reduction chamber 4-1-2. The vertical silencers 4-1-2-1 between two adjacent rows are staggered but not connected, forming a tortuous airflow channel between the vertical silencers 4-1-2-1, so that the exhaust airflow is laterally tortuous in the secondary exhaust noise reduction chamber 4-2-1, thereby further improving the sound absorption and noise reduction effect. The vertical silencers 4-1-2-1 have a certain length of straight sections on the inlet and exhaust sides of the secondary exhaust noise reduction chamber 4-1-2, forming straight air duct sections between each other, and the vertical silencers 4-1-2-1 form an inclined section structure toward the middle of the secondary exhaust noise reduction chamber 4-1-2, and the length ratio of the straight section to the inclined section is 1:2-3, and the noise reduction effect is obvious.

[0039] In another step, as a preferred solution, there are two side wing panels 5, which are respectively arranged on both sides of the compartment 2, and are hinged to the top of the compartment 2 by hinges. The inner edge of the opening corresponding to the side wing panel 5 on the compartment 2 is provided with a limiting frame 7 corresponding to the edge of the side wing panel 5, and a driving mechanism for driving the side wing panel 5 to unfold and close is provided between the side wing panel 5 and the limiting frame 7. The side wing panel 5 is a right-angle folding structure, wherein the edge of the first right-angle folding edge 5-1 is hinged to the top of the compartment 2, and the second right-angle folding edge 5-2 matches the side of the compartment 2, and the limiting frame 7 has the first right-angle folding edge 5-1 and the second right-angle folding edge 5-2. Match the side of the compartment 2, and the limiting frame 7 has a plurality of right-angle folding edges 5-1 and 5-2, respectively. The first limiting frame 7-1 and the second limiting frame 7-2 corresponding to the edge of the right-angle fold 5-2 are perpendicular to each other. A bevel notch 7-3 is arranged on the outside of the right-angle connection between the first limiting frame 7-1 and the second limiting frame 7-2. An inclined block 5-3 matching the bevel notch 7-3 is arranged at the right angle of the wing panel 5. The first limiting frame 5-1 is a channel steel structure with an opening at the top. The driving mechanism is a telescopic hydraulic cylinder 8. The driving mechanism can also use elastic support members such as springs. The two ends of the hydraulic cylinder 8 are respectively hinged to the first limiting frame 7-1 and the inclined block 5-3. A sealing strip is arranged between the edge of the wing panel 5 and the contact surface of the compartment 2 and / or the limiting frame 7. The sealing strip is a rubber strip or a flocking sealing strip.

[0040] By hingedly connecting the wing panel 5 on the body 2, setting a limit frame 7 on the body 2 corresponding to the edge of the wing panel 5, and driving the expansion and closing of the wing panel 5 by the hydraulic cylinder 8, the function of removing the generator set 6 in the body 2 for inspection and maintenance can be effectively realized without disassembling the body 2. Without disassembling the body 2, the stability of the structure of the body 2, the connection parts of the various structures of the body 2 and the sound insulation and noise reduction effect can be effectively guaranteed, which is stable and reliable. The wing panel 5 adopts a right-angle folding structure and is hinged to the top of the body 2. On the one hand, it can effectively increase the height of the wing panel 5 after expansion, which is convenient for forklifts and other operating equipment to operate the generator set 6 on one side of the body; on the other hand, it is more convenient to set the driving mechanism. Combined with the first limit frame 7-1 of the channel steel structure, it is convenient to set the telescopic hydraulic cylinder 8 in the groove of the first limit frame 7-1, and enable it to expand and close the wing panel 5 within a shorter stroke. By setting a sloped notch 7-3 at the right-angle connection of the limiting frame 5, and setting a corresponding matching inclined block 5-3 at the right angle of the side wing panel 5, and by hinged connection of the hydraulic cylinder 8, the inclined block 5-3 and the first limiting frame 7-1, it is achieved that when the side wing panel 5 is closed, the hydraulic cylinder is hidden in the first limiting frame 7-1. The structure is simple, the design is ingenious, and the sealing strip design is combined, so that the compartment 2 has good sealing and sound insulation and noise reduction performance.

[0041] After testing, it is found that the power supply vehicle of the present invention has good ventilation effect, fully meets the air circulation needs of the generator set in the compartment, the equipment runs stably, and the output power is guaranteed; the noise detection at a distance of 1 meter can be effectively lower than 50 decibels; the maintenance time of the generator set is effectively shortened to less than one tenth of the original time, and the maintenance efficiency is improved by more than 90%.

[0042] The technical solution of the present invention is not limited to the scope of the embodiments described in the present invention. The technical contents not described in detail in the present invention are all well-known technologies.

Claims

1. A wingspan type power supply vehicle, comprising a chassis and a body, wherein a generator set is arranged in the body, characterized in that: The compartment body has a compartment wall for noise reduction, sound absorption and sound insulation, the front and rear parts of the compartment body are respectively provided with an air intake noise reduction system and an exhaust noise reduction system, and the side of the compartment body is provided with a wing compartment panel that can be deployed and closed; the compartment wall and the wing compartment panel both include a honeycomb hole plate layer, a sound-absorbing cotton layer and a noise sound insulation layer arranged in sequence, and have good noise reduction, sound absorption and sound insulation effects; the top of the compartment body is provided with a groove, and a muffler exhaust pipe connected to a generator set arranged in the compartment body and an air intake pipe with a negative pressure air filter element are arranged in the groove; the air intake noise reduction system includes air intake louvers arranged on both sides of the front part of the compartment body, and a sound absorption and noise reduction mechanism is arranged inside the air intake louvers, and the sound absorption and noise reduction mechanism has at least two rows of oblique noise reduction plates, and the oblique noise reduction plates between adjacent rows are arranged in pairs but not connected to each other, so as to form a tortuous air flow channel between the noise reduction plates, and a herringbone guide plate is arranged on the air outlet side of the sound absorption and noise reduction mechanism, and the guide plate is a suction plate with a honeycomb structure; The exhaust noise reduction system comprises an exhaust duct connected to the air outlet of the exhaust fan of the generator set and an exhaust louver arranged on the air outlet side of the exhaust duct, the exhaust louver is arranged on the rear wall of the compartment, the exhaust duct comprises a first-level exhaust noise reduction compartment and a second-level exhaust noise reduction compartment which are interconnected, a plurality of horizontal sound-absorbing panels are arranged in the first-level exhaust noise reduction compartment, a plurality of vertical sound-absorbing panels are arranged in the second-level exhaust noise reduction compartment, the surfaces of the horizontal sound-absorbing panels and the vertical sound-absorbing panels are covered with a sound-absorbing and noise-reducing layer made of sound-absorbing cotton, velvet and sponge materials; the cross-section of the first-level exhaust noise reduction compartment is a gradually enlarged trumpet shape, and its longitudinal section along the air outlet direction is a trapezoidal structure, the length of the trapezoidal side on the air outlet side is smaller than the length of the trapezoidal side on the air inlet side, and the first-level exhaust noise reduction compartment is The air outlet side and the air inlet side are offset up and down by a certain distance, the first-level exhaust noise reduction chamber is inclined, the horizontal silencer plate is almost parallel to the upper and lower surfaces of the first-level exhaust noise reduction chamber, and the spacing distance between two adjacent horizontal silencers on the air inlet side or the air outlet side of the first-level exhaust noise reduction chamber is the same; at least two rows of vertical silencers are arranged between the top plate and the bottom plate of the second-level exhaust noise reduction chamber, and the vertical silencers between two adjacent rows are staggered but not connected to each other, forming a tortuous air flow channel between the vertical silencers, and the vertical silencers have a certain length of straight sections on the air inlet side and the air outlet side of the second-level exhaust noise reduction chamber, forming straight air duct sections between each other, and the vertical silencers form an inclined section structure toward the middle of the second-level exhaust noise reduction chamber, and the ratio of the length of the straight section to the inclined section is 1:2-3; There are two side wing panels, which are respectively arranged on both sides of the box body. The side wing panels are hinged to the top of the box body. The inner edge of the opening on the box body corresponding to the side wing panels is provided with a limiting frame corresponding to the edge of the side wing panels. A driving mechanism for driving the side wing panels to unfold and close is provided between the side wing panels and the limiting frame; the side wing panels are right-angled folded structures, wherein the first right-angled folded edge is hinged to the top of the box body, the second right-angled folded edge matches the side of the box body, and the limiting frame has a plurality of edges that are respectively connected to the first right-angled folded edge and the second right-angled folded edge. The first limiting frame and the second limiting frame correspond to the edges, and the first limiting frame and the second limiting frame are perpendicular to each other. An inclined notch is arranged on the outer side of the right-angle connection between the first limiting frame and the second limiting frame, and an inclined block matching the inclined notch is arranged at the right angle of the side wing panel. The first limiting frame is a channel steel structure with an opening on the top, and the driving mechanism is a telescopic hydraulic cylinder, and the two ends of the hydraulic cylinder are respectively hinged to the first limiting frame and the inclined block; a sealing strip is arranged between the contact surface between the edge of the side wing panel and the compartment body and / or the limiting frame.

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