Silent box type diesel generating set

Abstract

The invention discloses a mute box type diesel generating set which comprises a modularized mute box structure, a tunnel type ventilation system, a heat dissipation optimization assembly and a silencer layout. The modular structure is assembled in a detachable connection mode; the tunnel type ventilation system ensures that cold air uniformly covers the generator, the diesel engine and the water tank radiator, and local high temperature is avoided; the heat dissipation optimization assembly improves the heat dissipation efficiency through a blowing type fan and an optimized airflow path; the silencer is transversely installed, the pipeline layout is optimized, heat accumulation is reduced, and the stability of the unit is improved; in addition, through the design of the flat-base-plate-shaped blades and the sawtooth structure, noise is lowered, heat dissipation is efficient, and low-noise operation is achieved. The heat dissipation effect and reliability of the generator set are remarkably improved, the service life of the generator set is remarkably prolonged, and the technical problem that an existing mute box type diesel generator set is generally low in heat dissipation efficiency is solved.

Description

Technical Field

[0001] The invention relates to the technical field of power generation equipment, and in particular to a soundproof box-type diesel generator set. Background Art

[0002] As a backup power system, diesel generator sets are widely used in hospitals, data centers, communication base stations and other scenarios with extremely high requirements for power supply reliability. The design of the speaker-type diesel generator set needs to meet the requirements of low noise, efficient heat dissipation and convenient maintenance. The closed silent box structure can effectively reduce noise, but it seriously restricts the heat dissipation performance. Some existing solutions have opened vents in the box and installed axial fans, but the airflow organization is chaotic, and the cold and hot air are easy to mix, resulting in low heat dissipation efficiency and even local overheating of the diesel engine. Some improvement schemes add shutters to the inlet / outlet, but the shutter blades are mostly flat or arc-shaped structures, which can only achieve simple waterproof and dustproof, and the fixed blade angle cannot guide the airflow to flow in a directional manner. Although setting up independent air ducts for the generator, diesel engine, and water tank radiator can avoid heat reflux, the structure is complex and occupies space, which is difficult to meet the compactness requirements of the modular silent box. The muffler is usually arranged vertically on the side of the unit, and its exhaust pipe needs to bypass the inside of the box, which not only increases the heat radiation of the exhaust gas, but also hinders the flow of cold air, further worsening the heat dissipation conditions. The above problems cause the existing silent box-type units to frequently trigger high temperature alarms when running at high loads, and even limit power operation due to insufficient heat dissipation. Therefore, there is an urgent need for an innovative solution that can achieve efficient directional heat dissipation in a limited space while taking into account the requirements of noise reduction and modular assembly. Summary of the invention

[0003] In view of the above problems, one purpose of the present invention is to solve the technical problem of low heat dissipation efficiency of existing silent box-type diesel generator sets, and to provide a silent box-type diesel generator set that can achieve efficient directional heat dissipation in a limited space while taking into account noise reduction and modular assembly requirements.

[0004] In order to achieve these purposes and other advantages of the present invention, the present invention provides a silent box-type diesel generator set, comprising: The modular soundproof box structure is assembled by a chassis component, a right cover component, a left cover component, a top cover component, a front door component and an electrical box component through a detachable connection method, and each component adopts a steel plate folded edge beam structure; the right cover component and the left cover component are respectively provided with an air inlet and an air outlet, and both are equipped with shutters, the blade cross-section of the shutter is a flat bottom plate structure, the front and rear sections of the blades are bent (for example, the bending angle is 135 degrees), and the middle section is straight. When a number of blades are inclined and parallel and equidistantly arranged, a tortuous air duct is formed between adjacent blades, and the front section of the blade is in a vertical state at this time, which can block the airflow from passing through the air duct opening directly and horizontally into the interior of the soundproof box; the middle section of the blade is in an inclined state, which guides the airflow upward through the air duct; the rear section of the blade is in a parallel state, so that the airflow enters the interior of the soundproof box horizontally; The tunnel ventilation system is configured such that cold air enters from the air inlet of the right cover plate component, is guided by the shutter blades to form a horizontal airflow, flows through the generator, the diesel engine and the water tank radiator in sequence, and is discharged from the air outlet of the left cover plate component to form a directional airflow channel; The heat dissipation optimization component includes a blowing cooling fan of the diesel engine, a water tank radiator and a generator heat dissipation air duct; the blowing cooling fan is arranged at the front end of the diesel engine, sucks in cold air from the air inlet and forcibly blows it to the generator and the diesel engine; the generator air inlet is arranged on the same side as the mute box air inlet, and the tail end heat dissipation air inlet directly introduces cold air, and the air outlet is connected in series with the heat dissipation path of the diesel engine; The muffler and pipeline layout, the muffler is horizontally installed on the upper cross beam of the soundproof box, its exhaust direction is the same as the air outlet of the left cover component, and the length of the muffler connecting pipeline is less than 1 / 2 of the width of the soundproof box.

[0005] The flat-bottomed disc-shaped blades of the shutters of this embodiment cooperate with the zigzag air duct to reduce air flow resistance, increase the cold air flow by more than 40%, and block the leakage of rain and noise; the tunnel ventilation system forces the air flow to flow through key heat-generating components in sequence to improve the heat dissipation efficiency; the blower fan is connected in series with the generator heat dissipation duct to maximize the utilization of cold air and reduce the continuous operating temperature of the unit; the muffler is arranged horizontally and the short pipe design reduces the interference of high-temperature exhaust gas on the air flow in the box and reduces the exhaust resistance.

[0006] Furthermore, the louvered air inlet of the right cover plate and the same-configuration air outlet of the left cover plate form a directional ventilation tunnel; The axial direction of the blowing cooling fan is aligned with the core area of ​​the water tank radiator to form a main cooling channel that is consistent with the tunnel flow direction; the deviation angle between the generator air inlet and the air inlet axis is ≤15°, and the generator housing is provided with a generator exhaust port on its circumference. The gas discharged from the exhaust port is connected to the main cooling channel through the guide cover; The muffler is suspended horizontally on the top beam of the box, and its exhaust direction is arranged at an acute angle of 30-45° to the axial direction of the air outlet. The exhaust pipe length is ≤0.5m and the surface is covered with an aerogel insulation layer.

[0007] Furthermore, a sawtooth structure is provided on the surface of the blades of the shutter, and the sawtooth is continuously distributed on the windward side and the leeward side of the middle section of the blade at an inclination angle of 25-35°, the spacing between adjacent sawtooths is 2-5mm, and the sawtooth height is 1-3mm.

[0008] Furthermore, the serrations on the surface of the middle section of the blade are distributed in a gradient manner along the airflow direction: The first gradient sawtooth spacing is 4-6mm; The second gradient sawtooth spacing is 2-3mm; The third gradient sawtooth spacing is 1-2mm; Among them, the spacing change rate of adjacent saw teeth is ≤15%.

[0009] At the first gradient, the airflow has a low velocity and high turbulence intensity when it first enters, so a lower density sawtooth is required to avoid excessive disturbance; at the second gradient, the airflow accelerates, so a high density sawtooth is required to enhance vortex breakup and heat exchange; at the third gradient, the airflow tends to be stable, and denser sawtooth can suppress boundary layer separation noise and input horizontal airflow into the box. The spacing change rate of adjacent sawtooth is ≤15% to prevent the generation of secondary vortices caused by sudden changes.

[0010] Furthermore, the blades and serrations of the shutter are also covered with a hydrophobic-thermal conductive composite coating, and the coating includes from the inside to the outside: 50-80μm thick anodized aluminum layer, thermal conductivity ≥200W / (m·K); 20-30μm thick fluorocarbon resin layer, contact angle ≥150°, surface energy ≤15mN / m; A water guide groove is provided at the root of the saw teeth, and the depth of the groove is 1 / 3-1 / 2 of the height of the saw teeth.

[0011] Furthermore, the depth of the water guide groove gradually increases from one end to the other end along the length of the blade, and the increasing gradient of the groove depth is 0.05-0.2mm / cm, so that the bottom of the water guide groove is inclined 3°-10° toward one side of the blade, and the water gathered on the blade is gathered along the inclined direction to the end of the blade and discharged.

[0012] The uniform groove depth cannot adapt to the difference in condensate generation rate in different areas of the blade (the water production in the middle heat exchange area is high), while the deep increasing gradient (0.05-0.2mm / cm) of this embodiment can match the linear increase of condensate flow along the length of the blade, and the bottom inclination angle utilizes gravity self-cleaning to make water droplets slide off the blade surface quickly.

[0013] Furthermore, the deflector includes: Wing plates are arranged in parallel on the upper and lower sides of the generator exhaust port; An arc-shaped cover plate is arranged between the wing plates and covers the exhaust port of the generator; The wing plate and the curved cover plate form a tapered flow channel to guide the airflow to accelerate, creating a low-pressure area above the generator exhaust port, prompting the gas inside the generator to be discharged from the exhaust port and take away the heat.

[0014] The present invention has at least the following beneficial effects: 1. The modular soundproof box structure, tunnel ventilation system, heat dissipation optimization components, muffler and pipeline layout design of the present invention reduce the number of parts, simplify the assembly process, improve assembly efficiency, optimize the airflow direction, improve the heat dissipation effect and reliability of the soundproof box-type generator set, improve the air intake efficiency of the diesel engine, reduce fuel consumption, optimize the internal structure of the box, improve the heat dissipation effect of the motor, ensure the output power stability of the motor, and increase the service life of the motor.

[0015] 2. The flat disc-shaped blades of the present invention construct a tortuous air duct. Through the composite flow channel design of vertical blocking in the front section, inclined diversion in the middle section, and horizontal input in the rear section, combined with the sawtooth blade structure design, the airflow resistance is reduced, the cold air flow rate is increased, the intrusion of rainwater is reduced, and the noise leakage is reduced.

[0016] 3. In view of the problem that the interior of the generator is relatively closed and it is difficult to form airflow conduction and efficient heat dissipation, the present invention designs a deflector in combination with the airflow direction to create a low-pressure area above the exhaust port in the circumferential direction of the generator, so as to prompt the internal gas of the generator to be discharged from the exhaust port to take away the heat and accelerate it to enter the main heat dissipation flow channel.

[0017] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the first structure of the soundproof box-type diesel generator set of the present invention; Figure 2 It is a second structural schematic diagram of the soundproof box-type diesel generator set of the present invention; Figure 3 It is a schematic diagram of the structure of the blade arrangement of the present invention; Figure 4 It is a schematic diagram of the structure of the blade of the present invention; Figure 5 It is a schematic structural diagram of the air guide cover of the present invention. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with embodiments so that those skilled in the art can implement the invention with reference to the description.

[0020] As shown in FIGS. 1 to 5 , the soundproof box type diesel generator set includes: a soundproof box 1 , a water tank radiator 2 , a diesel engine 3 , a generator 4 , a tool box 5 , and a fuel tank 6 .

[0021] As shown in FIG2 , the soundproof box 1 includes a chassis component 11, a right cover component 12, an electrical box component 13, a top cover component 14, a left cover component 15, a front door component 16, a middle pillar component 17, and a lower cover component 18, which are detachably connected and assembled by means of screws, rivets, and hinges.

[0022] As shown in FIG. 1 , the diesel engine 3 comprises a diesel engine body 31 , an engine cooling fan 32 , a muffler 33 , and an air filter 34 , wherein the engine cooling fan 32 is a blowing structure.

[0023] The generator 4 is as follows Figure 1 As shown, the connection end between the generator and the diesel engine 3 is the heat dissipation outlet of the generator housing (including the heat dissipation exhaust port arranged on the front end face of the generator housing and the heat dissipation exhaust port arranged circumferentially of the housing), and the tail end of the generator is the heat dissipation inlet 401 of the generator housing.

[0024] The ventilation of the soundproof box 1 adopts a tunnel structure, wherein the right cover plate component 12 is the air inlet 101 of the soundproof box 1 , and the left cover plate component 15 is the air outlet 102 of the soundproof box 1 .

[0025] The electrical box component 13 is designed with a working status display screen, buttons and power terminals of the diesel generator set. The lower end is the right cover component 12, which is designed with an air inlet of the soundproof box 1. The left cover component 15 and the right cover component 12 are both designed with shutters for rain protection and ventilation.

[0026] The right cover plate component 12 is the air inlet 101 of the silent box 1, and the left cover plate component 15 is the air outlet 102 of the silent box 1. The louver blades installed on the left and right cover plate components have a flat disc-shaped structure, and the two ends of the blades are bent. When the silent box diesel generator set is started, the engine cooling fan runs, sucking cold air from the right cover plate component 12, and guiding the airflow through the louver blades, so that the airflow flows horizontally through the inside of the silent box 1, cools the generator 4 and the diesel engine 3, and then flows through the water tank radiator 2 and the left cover plate component 15 to be discharged, avoiding the turbulence of cold air inside the box body, resulting in poor heat dissipation and causing the engine water temperature high alarm.

[0027] The arrangement of the air inlet 401 of the generator 4 and the air inlet 101 of the silent box 1 is conducive to the generator directly inhaling cold air from the air inlet of the silent box 1 for heat dissipation, thereby improving the heat dissipation effect of the motor and ensuring the output power and service life of the silent box generator set.

[0028] The left cover plate component 15 is designed with an exhaust port of the diesel engine 3. The exhaust gas of the diesel engine 3 is directly discharged into the atmosphere after being silenced by the muffler 33. The exhaust port of the diesel engine 3 is arranged on the same side as the air outlet of the mute box 1, which effectively avoids the problem of exhaust gas backflow into the inside of the mute box 1. The exhaust direction of the diesel engine 3 is arranged at an acute angle of 30-45° to the axial direction of the air outlet, so that the exhausted exhaust gas is pushed away by the airflow of the air outlet, reducing the exhaust gas backflow. The exhaust pipe length is ≤0.5m and the surface is covered with an aerogel insulation layer, which effectively prevents the heat of the exhaust pipe from being directly released into the box.

[0029] The muffler 33 of the diesel engine 3 is arranged horizontally and directly mounted on the crossbeam on the upper part of the muffler box 1, so that the muffler 33 and its connecting pipes are shortened to the minimum, and the heat dissipation of the muffler 33 and its connecting pipes in the muffler box 1 is reduced.

[0030] The tool box 5 and the fuel tank 6 are arranged at the bottom of the soundproof box 1, which effectively utilizes the bottom space of the soundproof box 1. The modular design facilitates the disassembly of the tool box 5 and the fuel tank 6. When the fuel tank 6 fails, it can be replaced separately, ensuring the convenience and timeliness of maintenance.

[0031] The chassis component 11 is integrated with a mounting position for a starter battery, which is arranged on the side of the diesel engine 3 .

[0032] The right cover plate component 12, the electrical box component 13, the top cover plate component 14, and the left cover plate component 15 of the mute box 1 are all made of steel plate folded edges as beams, which ensures strength while effectively reducing weight. The entire mute box 1 is assembled from six major components, which is convenient for installation and transportation and reduces production costs.

[0033] Further, in another embodiment, Figure 1 As shown, the 135° bent disc-shaped louver air inlet 101 of the right cover plate 12 and the same-shaped air outlet 102 of the left cover plate 15 form a directional ventilation tunnel; The blowing cooling fan 32 is axially aligned with the core area of ​​the water tank radiator 2 to form a main cooling channel consistent with the tunnel flow direction; the generator air inlet 401 and the box air inlet 101 have an axial deviation angle of ≤15°. Since the cooling exhaust port arranged on the front end face of the generator housing directly impacts the diesel engine 3 to form resistance, a generator exhaust port 402 is also arranged on the circumference of the generator housing. The gas discharged from the exhaust port 402 flows into the main cooling channel through the guide cover 41; The muffler 33 is suspended horizontally on the top beam of the box body, and its exhaust direction is arranged at an acute angle of 30-45° with the axial direction of the air outlet. The exhaust pipe length is ≤0.5m and the surface is covered with an aerogel insulation layer.

[0034] Further, in another embodiment, Figure 3 As shown, a sawtooth structure is arranged on the surface of the blade of the shutter, and the sawtooth is continuously distributed on the windward side and the leeward side of the middle section of the blade at an inclination angle of 25-35°, the spacing between adjacent sawtooth is 2-5mm, and the sawtooth height is 1-3mm.

[0035] Furthermore, in another embodiment, the serrations on the surface of the middle section of the blade are distributed in a gradient manner along the airflow direction: The first gradient sawtooth spacing is 4-6mm; The second gradient sawtooth spacing is 2-3mm; The third gradient sawtooth spacing is 1-2mm; Among them, the spacing change rate of adjacent saw teeth is ≤15%.

[0036] At the first gradient, the airflow has a low velocity and high turbulence intensity when it first enters, so a lower density of sawtooth is required to avoid excessive disturbance; at the second gradient, the airflow accelerates, so a high density of sawtooth is required to enhance vortex breakup and heat exchange; at the third gradient, the airflow tends to be stable, and denser sawtooth can suppress boundary layer separation noise and input horizontal airflow into the box; the spacing change rate of adjacent sawtooth is ≤15% to prevent mutations from causing secondary vortex generation; the sawtooth can also effectively reduce the leakage of noise inside the box.

[0037] The blade structure with serrated teeth of the 135° disc-shaped louver in this embodiment is verified by fluid simulation CFD simulation. 4 The wind resistance coefficient is less than or equal to 0.51, and the rain penetration efficiency is as high as 99%. Compared with blades without serrations, the noise leakage is reduced by 5-10dB(A).

[0038] Further, in another embodiment, Figure 4 As shown, the blades and serration surfaces of the shutter are also covered with a hydrophobic-thermal conductive composite coating, and the coating includes from the inside to the outside: 50-80μm thick anodized aluminum layer, thermal conductivity ≥200W / (m·K); 20-30μm thick fluorocarbon resin layer, contact angle ≥150°, surface energy ≤15mN / m; A water guide groove is provided at the root of the saw teeth, and the depth of the groove is 1 / 3-1 / 2 of the height of the saw teeth.

[0039] The hydrophobic coating of this embodiment allows water droplets to roll off within 0.5 seconds, reducing wind resistance; the anodized aluminum layer conducts heat from the blade surface to the airflow, improving heat dissipation efficiency; the water guide groove directs drainage to avoid water accumulation and corrosion.

[0040] Further, in another embodiment, Figure 4 As shown, the depth of the water guide groove gradually increases from one end to the other end along the length of the blade, and the increasing gradient of the groove depth is 0.05-0.2mm / cm, so that the bottom of the water guide groove is inclined 3°-10° to one side of the blade, and the water gathered on the blade is gathered along the inclined direction to the end of the blade and discharged.

[0041] The uniform groove depth cannot adapt to the difference in condensate generation rate in different areas of the blade (the water production in the middle heat exchange area is high), while the deep increasing gradient (0.05-0.2mm / cm) of this embodiment can match the linear increase of condensate flow along the length of the blade, and the bottom inclination angle utilizes gravity self-cleaning to make water droplets slide off the blade surface quickly.

[0042] Further, in another embodiment, Figure 5 As shown, the deflector 41 includes: Wing plates 410 are arranged in parallel on both sides of the generator circumferential exhaust port 402; the front end of the wing plate extends along the length direction of the generator housing, the rear end of the wing plate exceeds the exhaust port, and is fixed to the generator housing through a detachable connector or adhesively fixed; The arc-shaped cover plate 412 connects the upper and lower wing plates; preferably, its curvature radius R = 0.6W ± 0.05W (W is the width of the exhaust port), and the vertical distance H between the vertex of the arc-shaped cover and the exhaust port 1 =0.5H±0.02H (H is the height of the wing plate); The arc-shaped cover plate and the wing plate together form a tapered flow channel 412 above the exhaust port 402. The contraction angle β of the tapered flow channel 412 is about 12°. The airflow entering the air inlet 101 flows along the generator housing and enters the tapered flow channel from the front end of the wing plate. The arc-shaped cover plate gradually reduces the cross section of the tapered flow channel (for example, the cross section S of the tapered flow channel at the front end of the wing plate is 1 / 2. 1 The cross section S of the tapered flow channel at the top of the curved cover plate 0 , which can be set to S 0 / S 1 =0.2-0.5), using the Bernoulli effect to increase the airflow velocity, reaching the maximum velocity near the top of the arc cover plate, and then forming a steady low pressure area 413 with a pressure difference ΔP=250-400Pa above the exhaust port.

[0043] After testing, the unit of the present invention runs continuously for 12 hours at 45°C, the water temperature is stabilized at 88±1.5°C, and the noise is reduced to about 67dB(A), effectively solving the problems of uneven heat dissipation and excessive noise.

[0044] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and the embodiments. They can be applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily realized.

Claims

1. A silent box-type diesel generator set, characterized in that: include: The modular soundproof box structure is composed of a chassis component, a right cover component, a left cover component, a top cover component, a front door component and an electrical box component, which are assembled by bolts in a detachable manner. Each component adopts a steel plate folded edge beam structure; the right cover component and the left cover component are respectively provided with an air inlet and an air outlet, and both are equipped with shutters. The blade cross-section of the shutter is a flat bottom plate structure, the front and rear sections of the blade are bent, the middle section is straight, and a number of blades are inclined and parallel and equidistantly arranged, forming a zigzag air duct between adjacent blades, the front section of the blade is vertical to block the airflow from directly entering horizontally, the middle section of the blade is inclined to guide the air upward, and the rear section of the blade is horizontal to allow the airflow to enter the soundproof box smoothly; The tunnel ventilation system is configured so that cold air enters from the air inlet on the right cover plate, is guided by the louver to form a horizontal airflow, flows through the generator, diesel engine and water tank radiator in sequence, and is discharged from the air outlet on the left cover plate; The heat dissipation optimization component includes a blowing cooling fan of the diesel engine, a water tank radiator and a generator heat dissipation air duct; the blowing cooling fan is arranged at the front end of the diesel engine, forcibly sucking in cold air and blowing it toward the generator and the diesel engine; the generator air inlet and the mute box air inlet are arranged on the same side, the tail end heat dissipation air inlet directly introduces cold air, and the air outlet is connected in series with the diesel engine heat dissipation path; The muffler is installed horizontally on the upper crossbeam of the silencer box, its exhaust direction is the same as the air outlet of the left cover, and the length of the muffler connecting pipe is less than 1 / 2 of the width of the silencer box.

2. The silent box-type diesel generator set according to claim 1, characterized in that: The louvered air inlet of the right cover plate and the same-shaped air outlet of the left cover plate form a directional ventilation tunnel; The axial direction of the blowing cooling fan is aligned with the core area of ​​the water tank radiator to form a main cooling channel that is consistent with the tunnel flow direction; the deviation angle between the generator air inlet and the air inlet axis is ≤15°, and the generator housing is provided with a generator exhaust port on its circumference. The gas discharged from the exhaust port is connected to the main cooling channel through the guide cover; The muffler is suspended horizontally on the top beam of the box, and its exhaust direction is arranged at an acute angle of 30-45° to the axial direction of the air outlet. The exhaust pipe length is ≤0.5m and the surface is covered with an aerogel insulation layer.

3. The silent box-type diesel generator set according to claim 1, characterized in that: The surface of the blades of the shutter is provided with saw teeth, and the saw teeth are continuously distributed on the windward side and the leeward side of the blades at an inclination angle of 25-35 degrees.

4. The silent box-type diesel generator set according to claim 3, characterized in that: The serrations on the middle surface of the blade are distributed in a gradient manner along the airflow direction: The first gradient sawtooth spacing is 4-6mm; The second gradient sawtooth spacing is 2-3mm; The third gradient sawtooth spacing is 1-2mm; Among them, the spacing change rate of adjacent saw teeth is ≤15%.

5. The silent box-type diesel generator set according to claim 4, characterized in that: The blades and serrations of the blinds are also covered with a hydrophobic-thermal conductive composite coating, which includes from the inside to the outside: 50-80μm thick anodized aluminum layer, thermal conductivity ≥200W / (m·K); 20-30μm thick fluorocarbon resin layer, contact angle ≥150°, surface energy ≤15mN / m; A water guide groove is provided at the root of the saw teeth, and the depth of the groove is 1 / 3-1 / 2 of the height of the saw teeth.

6. The silent box-type diesel generator set according to claim 4, characterized in that: The depth of the water guide groove gradually increases from one end to the other end along the length of the blade, and the increasing gradient of the groove depth is 0.05-0.2mm / cm, so that the bottom of the water guide groove is inclined 3°-10° to one side of the blade, and the water gathered on the blade is gathered along the inclined direction to the end of the blade and discharged.

7. The silent box-type diesel generator set according to claim 2, characterized in that: The air shroud includes: Wing plates are arranged in parallel on the upper and lower sides of the generator exhaust port; An arc-shaped cover plate is arranged between the wing plates and covers the exhaust port of the generator; The wing plate and the curved cover plate form a tapered flow channel to guide the airflow to accelerate, creating a low-pressure area above the generator exhaust port, prompting the gas inside the generator to be discharged from the exhaust port and take away the heat.

8. The silent box-type diesel generator set according to claim 1, characterized in that: The bending angle of the front and rear sections of the blade is 135°.

Images