A silent diesel generator set for low temperature environment

Abstract

The present application belongs to diesel generating set technical field, mainly discloses a kind of mute type diesel generating set for low temperature environment.The problem that the output shaft of diesel engine is increased due to initial connection with the input shaft of generator, including mounting seat, the mounting seat is equipped with sound insulation shell, the mounting seat is fixedly connected with diesel engine and generator, the output shaft of diesel engine is fixedly connected with fixed column, the fixed column is connected with sliding shell by spline, the sliding block is slidably connected in the sliding shell, the input shaft of generator is fixedly connected with connecting column, the connecting column is rotatably connected with rotating disc.The position of sliding shell is moved, the sliding block and rotating disc are connected and matched, the sound insulation shell ensures the mute working state of the device, the output shaft of diesel engine and the input shaft of generator are initially disconnected, only the diesel engine is rotated for preheating, the rotating load of diesel engine output shaft is reduced, and the additional wear of diesel engine is avoided.

Description

Technical Field

[0001] This invention belongs to the technical field of diesel generator sets, and mainly discloses a silent diesel generator set for low-temperature environments. Background Technology

[0002] A diesel generator set is a mechanical device that converts the chemical energy of diesel fuel into electrical energy. It is widely used in various situations as a backup or main power source. When a silent diesel generator set is initially started in a low-temperature environment, the diesel engine is usually started first and allowed to run at a low speed for preheating. Once the diesel engine temperature rises to a set value, it begins to run stably and drives the generator to generate electricity. However, because the output shaft of the diesel engine is connected to the input shaft of the generator through a flange during the initial start-up, the entire load of the generator is applied to the output shaft of the diesel engine. This increases the starting shock experienced by the diesel engine in the initial stage, thereby increasing the possibility of damage to the diesel engine. In addition, during the preheating process of the diesel engine, the diesel engine needs to transfer some energy to the generator to make the generator run synchronously, which also affects the preheating effect of the diesel engine. Therefore, it is necessary to invent a silent diesel generator set with an initial function of disconnecting the output shaft of the diesel engine from the input shaft of the generator. Summary of the Invention

[0003] To address the problem of increased starting load caused by the initial connection between the diesel engine output shaft and the generator input shaft, this invention provides a silent diesel generator set for low-temperature environments.

[0004] The technical implementation scheme of the present invention is as follows: a silent diesel generator set for low-temperature environments, comprising a mounting base, a soundproof shell mounted on the mounting base, a diesel engine and a generator fixedly connected to the mounting base, the soundproof shell having evenly distributed exhaust holes and evenly distributed air intake holes, and evenly distributed first soundproof plates fixedly connected to the air intake holes of the soundproof shell, the output shaft of the diesel engine being fixedly connected to a fixing column, the fixing column being splined to a sliding shell, a limit block being slidably connected inside the sliding shell, and the input shaft of the generator being fixedly connected to a connecting column. A connecting column is rotatably connected to a rotating disk. The connecting column is fixedly connected to a fixed plate that is slidably connected to the rotating disk. A spring is fixed between the fixed plate and the rotating disk. The connecting column is slidably connected to a sliding block that is pressed against the rotating disk via a connecting frame. The rotating disk is provided with a through hole that is limited and engaged with a limiting block. A transmission block that is pressed against the sliding block is slidably connected in the through hole of the rotating disk. The transmission block is pressed against the limiting block. The diesel engine is provided with a transmission control mechanism for driving the generator input shaft to rotate.

[0005] As a preferred embodiment of the present invention, the cross-sectional shape of the exhaust hole on the soundproof shell is wavy, which is used to reflect and reduce the size of the sound waves passing through it.

[0006] As a preferred embodiment of the present invention, the first sound insulation plate has an arc-shaped cross-section, with its concave surface facing downwards, and its projected area in the vertical direction is larger than the cross-sectional area of ​​the air inlet of the sound insulation shell, in order to reduce the magnitude of the sound waves passing through the air inlet of the sound insulation shell.

[0007] As a preferred embodiment of the present invention, the sliding block is provided with an inclined surface on the side near the rotating disk, and the inclined surface of the sliding block is pressed and engaged with the through hole of the rotating disk, so that the sliding block is synchronously reset when the rotating disk is reset.

[0008] As a preferred embodiment of the present invention, the transmission control mechanism includes an electric actuator fixedly connected to the diesel engine near its output shaft. The telescopic end of the electric actuator is fixedly connected to a connecting plate that is rotatably connected to the sliding housing. A temperature detection device is provided at the flow point of the engine oil and coolant in the diesel engine. The exhaust pipe and intake pipe of the diesel engine both penetrate the sound insulation shell. A spring is fixedly connected between the sliding housing and the limiting block. A spring is fixedly connected between the sliding block and the connecting column. A speed detection component for detecting the rotational speed of the generator input shaft is provided on the connecting column. A connecting component for moving the position of the sliding housing is provided on the connecting plate.

[0009] As a preferred embodiment of the present invention, the speed detection component includes a fixed housing, which is fixedly connected to the connecting column on the side near the generator. A circumferentially evenly distributed centrifugal block is slidably connected inside the fixed housing. A spring is fixedly connected between the centrifugal block and the fixed housing. A flow guiding cavity is provided inside the connecting column, and the flow guiding cavity communicates with the fixed housing through circumferentially distributed flow guiding holes. A connecting ring is rotatably connected to the connecting column, and an annular cavity is provided inside the connecting ring. The flow guiding cavity communicates with the annular cavity of the connecting ring through symmetrically distributed flow guiding holes. Hydraulic oil is filled into both the flow guiding cavity and the annular cavity of the connecting ring.

[0010] In a preferred embodiment of the present invention, the connecting assembly includes a connecting cylinder fixedly connected to the connecting plate, a piston rod slidably connected inside the connecting cylinder, a first guide pipe communicating with the annular cavity of the connecting ring on the side of the connecting cylinder near the diesel engine, a limit pin slidably connected on the side of the connecting cylinder away from the diesel engine, a blind hole provided on the piston rod for limiting engagement with the limit pin, a spring fixedly connected between the connecting cylinder and the limit pin, a sliding ring splinedly connected to the sliding shell, and the piston rod being limited by a mounting block and the sliding ring. The sliding ring is fixedly connected to a mirror-shaped extrusion plate. The side of the extrusion plate away from the sliding ring is provided with an inclined surface. The sliding shell is slidably connected to a mirror-shaped connecting rod. A tension spring is fixed between the connecting rod and the sliding shell. The connecting rod is provided with a rectangular hole that is extruded and engaged with the corresponding extrusion plate. The end of the connecting column near the diesel engine is provided with circumferentially evenly distributed grooves. The connecting rod is limited and engaged with adjacent grooves on the connecting column. Hydraulic oil is filled in the connecting cylinder between the piston rod and the side near the diesel engine and the first guide pipe.

[0011] As a preferred embodiment of the present invention, it further includes an exhaust gas guiding mechanism, which is disposed on the upper side of the soundproof shell. The exhaust gas guiding mechanism is used to reuse the heat in the exhaust gas. The exhaust gas guiding mechanism includes an air guide shell, which is fixedly connected to the upper side of the soundproof shell. A filter device is fixedly connected inside the air guide shell. The air guide shell is connected to the exhaust pipe of the diesel engine. An air guide pipe is connected to one side of the air guide shell. The air guide pipe is inserted into the soundproof shell. An air supply pipe connected to the intake pipe of the diesel engine is fixedly connected to the air guide pipe. The air supply pipe penetrates the air guide pipe. The portion of the air supply pipe inside the air guide pipe is spiral-shaped. An auxiliary preheating component for controlling the connection state of the air guide pipe is provided on the upper side of the soundproof shell.

[0012] As a preferred embodiment of the present invention, the auxiliary preheating component includes a connecting block, which is fixedly connected to the upper side of the soundproof shell and to the air guide pipe. The connecting block has a through hole communicating with the air guide pipe. A first hydraulic cylinder is fixedly connected to the upper side of the soundproof shell. The first hydraulic cylinder is connected to a second guide pipe communicating with the first guide pipe. The telescopic end of the first hydraulic cylinder is fixedly connected to a sliding plate that is slidably connected to the connecting block. The sliding plate has a through hole communicating with the through hole of the connecting block. A baffle is fixedly connected to the sliding plate through a connecting frame. The baffle has a through hole communicating with the air guide pipe. Hydraulic oil is filled in both the first hydraulic cylinder and the second guide pipe.

[0013] As a preferred embodiment of the present invention, an auxiliary sound insulation mechanism is further included. The auxiliary sound insulation mechanism is disposed inside the sound insulation shell on the side near the diesel engine. The auxiliary sound insulation mechanism is used to temporarily block the sound transmission of the exhaust port of the sound insulation shell. The auxiliary sound insulation mechanism includes a second hydraulic cylinder, which is fixedly connected to the side of the sound insulation shell near the diesel engine. A connecting frame is fixedly connected to the telescopic end of the second hydraulic cylinder. The second hydraulic cylinder is connected to a third guide pipe that communicates with the side of the connecting cylinder away from the diesel engine. A second sound insulation plate is fixedly connected in a uniformly distributed manner inside the connecting frame. The second sound insulation plate has the same shape and function as the first sound insulation plate. Hydraulic oil is injected into the connecting cylinder between the side away from the diesel engine and the piston rod, the second hydraulic cylinder, and the third guide pipe.

[0014] Compared with the prior art, the present invention has at least the following advantages: 1. The present invention moves the position of the sliding shell to connect and cooperate the limiting block and the rotating disk, while the soundproof shell ensures the silent operation of the device, so as to achieve the purpose of initial disconnection between the output shaft of the diesel engine and the input shaft of the generator, allowing only the diesel engine to rotate for preheating, reducing the rotational load on the output shaft of the diesel engine, and avoiding additional wear on the diesel engine.

[0015] 2. This invention uses the upper limit block of the rotating sliding shell to intermittently drive the rotating disk to rotate, so that the rotation speed of the generator input shaft gradually increases to the rotation speed of the diesel engine output shaft, thereby achieving a stable connection between the diesel engine output shaft and the generator input shaft and greatly reducing the impact force when the diesel engine output shaft and the generator input shaft are connected.

[0016] 3. By changing the position of the sliding ring in the moving connection assembly, the present invention changes the engagement state of the extrusion plate and the connecting rod, so that the output shaft of the diesel engine and the input shaft of the generator can be rigidly transmitted through the connecting rod after the speed stabilizes, thereby improving the stability of power transmission between the diesel engine and the generator.

[0017] 4. This invention guides the flow of exhaust gas through the exhaust gas guide shell and the exhaust gas guide pipe in the exhaust gas guide mechanism, so that the exhaust gas can quickly increase the temperature inside the sound insulation shell, accelerate the preheating speed of the diesel engine and generator, and shorten the preheating time of this device when starting in a low temperature environment.

[0018] 5. The present invention moves several second sound insulation panels by connecting the frame in the auxiliary sound insulation mechanism, so that when the diesel engine generates strong noise during initial startup, the sound insulation effect at the exhaust port of the sound insulation shell is temporarily enhanced, thus ensuring the stability of the device in silent operation. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2This is a three-dimensional structural diagram of the parts in the diesel engine and generator of the present invention;

[0021] Figure 3 This is a cross-sectional view of the parts at the mounting base and soundproof shell of the present invention;

[0022] Figure 4 This is a three-dimensional structural diagram of the parts at the fixing column and connecting column of the present invention;

[0023] Figure 5 This is a three-dimensional structural diagram of the parts at the fixed column and sliding shell of the present invention;

[0024] Figure 6 This is a three-dimensional structural diagram of the parts at the rotating disk and the fixed plate of the present invention;

[0025] Figure 7 This is a cross-sectional view of the parts at the fixing shell and connecting ring of the present invention;

[0026] Figure 8 This is a three-dimensional structural diagram of the parts at the first guide tube and connecting rod of the present invention;

[0027] Figure 9 This is a three-dimensional structural diagram of the parts at the extrusion plate and connecting rod of the present invention;

[0028] Figure 10 This is a cross-sectional view of the parts at the air guide shell and air guide tube of the present invention;

[0029] Figure 11 This is a three-dimensional structural diagram of the parts at the sliding plate and baffle of the present invention;

[0030] Figure 12 This is a three-dimensional structural diagram of the parts at the connecting frame and the second sound insulation plate of the present invention.

[0031] Labels in the diagram: 1-Mounting base, 2-Soundproof shell, 3-Diesel engine, 4-Generator, 5-First soundproof panel, 6-Fixing column, 7-Sliding shell, 8-Limiting block, 9-Connecting column, 10-Rotating disk, 11-Fixing plate, 12-Sliding block, 13-Transmission block, 201-Electric actuator, 202-Connecting plate, 301-Fixing shell, 302-Centrifugal block, 303-Guiding cavity, 304-Connecting ring, 401-Connecting cylinder, 402-Piston rod 403-First guide pipe, 404-Limit pin, 405-Sliding ring, 406-Extrusion plate, 407-Connecting rod, 501-Air guide shell, 502-Filter device, 503-Air guide pipe, 504-Air delivery pipe, 601-Connecting block, 602-First hydraulic cylinder, 603-Second guide pipe, 604-Sliding plate, 605-Baffle, 701-Second hydraulic cylinder, 702-Connecting frame, 703-Third guide pipe, 704-Second sound insulation plate. Detailed Implementation

[0032] The following is in conjunction with the appendix Figures 1-12 The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1: When a diesel generator set is initially started in a low-temperature environment, the diesel engine needs to be started first to preheat it by rotating at low speed. Since the output shaft of the diesel engine and the input shaft of the generator are initially connected by flanges, the load of the generator starting is all applied to the output shaft of the diesel engine through its input shaft. This increases the starting impact on the diesel engine during initial start-up, causing additional wear to the diesel engine and increasing the possibility of damage to the diesel engine.

[0034] A silent diesel generator set for low-temperature environments, please refer to... Figures 1-7As shown, the device includes a mounting base 1, on which a soundproof shell 2 is mounted. A control panel is mounted on the soundproof shell 2. A diesel engine 3 and a generator 4 are fixedly connected to the mounting base 1. The diesel engine 3 is located to the left of the generator 4. A cooling fan (an existing mechanism used to accelerate the cooling of the diesel engine 3 by the coolant) is located to the left of the diesel engine 3. Several exhaust holes are evenly distributed vertically on the left side wall of the soundproof shell 2, and several air inlets are evenly distributed vertically on the right side wall. The exhaust holes on the soundproof shell 2 have a wavy cross-sectional shape to reflect and reduce the magnitude of the sound waves passing through them. Several first soundproofing plates 5 are evenly distributed vertically at the air inlets of the soundproof shell 2. The number of first soundproofing plates 5 is the same as the number of air inlets of the soundproof shell 2 and corresponds one-to-one. The first sound insulation panel 5 has an arc-shaped cross-section, with its concave surface facing downwards. The projected area of ​​the first sound insulation panel 5 in the vertical direction is larger than the cross-sectional area of ​​the air inlet of the sound insulation shell 2, which is used to reduce the magnitude of the sound waves passing through the air inlet of the sound insulation shell 2. At the same time, gas flows through the air inlet of the sound insulation shell 2. The output shaft of the diesel engine 3 is fixedly connected to a fixed column 6. A sliding shell 7 is splined to the right side of the fixed column 6. When the fixed column 6 drives the sliding shell 7 to rotate synchronously, the sliding shell 7 can slide left and right on the fixed column 6. A limit block 8 is slidably connected inside the sliding shell 7. A spring is fixedly connected between the sliding shell 7 and the limit block 8. The input shaft of the generator 4 is fixedly connected to a connecting column 9. A rotating disk 10 is rotatably connected to the left side of the connecting column 9. A fixed plate 11 is fixedly connected to the connecting column 9. The fixed plate 11 and the rotating disk 10 are slidably connected. The fixed plate 11 is L-shaped, and an arc-shaped rod is provided inside the rotating disk 10. The arc-shaped rod penetrates the fixed plate 11, and a spring is fixedly connected between the fixed plate 11 and the rotating disk 10. The arc-shaped rod is used to limit the spring to compress or extend in the arc direction. The connecting column 9 is slidably connected to the sliding block 12 through the connecting frame. The sliding block 12 is in a pressing fit with the rotating disk 10. The left side of the sliding block 12 presses against the rotating disk 10 and slides against it. A spring is fixedly connected between the sliding block 12 and the connecting column 9. The elastic coefficient of this spring is greater than that of the spring connected to the limiting block 8, and less than that of the spring connected to the fixed plate 11. The spring is initially in a compressed state. A through hole is provided on the rotating disk 10, and the rotating disk 10 is in a limiting fit with the limiting block 8. The sliding block 12... A ramp is provided on the left side, which slopes from front to back to the left. The working rotation direction of the output shaft of the diesel engine 3 and the input shaft of the generator 4 is clockwise (viewed from right to left). The ramp of the sliding block 12 is pressed into the through hole of the rotating disk 10, so that the sliding block 12 can be synchronously reset when the rotating disk 10 is reset. A transmission block 13 is slidably connected in the through hole of the rotating disk 10. The transmission block 13 is pressed into the sliding block 12 and the limit block 8. The diesel engine 3 is provided with a transmission control mechanism for driving the input shaft of the generator 4 to rotate. The diesel engine 3 and the transmission control mechanism are electrically connected to the control panel. By moving the position of the sliding shell 7, the limit block 8 and the rotating disk 10 are made to cooperate with each other, so that the diesel engine 3 does not drive the input shaft of the generator 4 to rotate during the initial preheating.The reduced load during diesel engine 3 startup ensures its rapid preheating. Simultaneously, the spring action between the fixed plate 11 and the rotating disk 10 gradually increases the rotational speed of the generator 4 input shaft, significantly reducing the impact force during transmission when the sliding housing 7 connects to the connecting column 9. The soundproof housing 2 and the first soundproof plate 5 ensure stable and quiet operation of the device.

[0035] Please refer to Figure 4 and Figure 5 As shown, the transmission control mechanism includes an electric actuator 201, which is fixed to the diesel engine 3 near its output shaft. A connecting plate 202 is fixed to the telescopic end of the electric actuator 201. The electric actuator 201 is located behind the connecting plate 202. The connecting plate 202 is rotatably connected to the sliding shell 7. The connecting plate 202 and the sliding shell 7 move left and right synchronously. The connecting plate 202 does not rotate. A temperature detection device is installed at the oil and coolant flow point inside the diesel engine 3 to detect whether the preheating of the diesel engine 3 is complete. The exhaust pipe and intake pipe of the diesel engine 3 both penetrate the sound insulation shell 2. A speed detection component for detecting the speed of the input shaft of the generator 4 is installed on the connecting column 9. A connecting component for moving the position of the sliding shell 7 is installed on the connecting plate 202. The electric actuator 201 is electrically connected to the control panel. By detecting the temperature inside the diesel engine 3, it is determined whether the diesel engine 3 has completed preheating. When the diesel engine 3 has completed preheating, the sliding shell 7 is controlled to move and connect with the connecting column 9 for transmission, so that the input shaft of the generator 4 starts to rotate.

[0036] Please refer to Figure 4 and Figure 7 As shown, the speed detection assembly includes a fixed housing 301, which is fixedly connected to the right side of the connecting column 9. Four circumferentially evenly distributed centrifugal blocks 302 are slidably connected inside the fixed housing 301. A spring is fixed between the centrifugal blocks 302 and the fixed housing 301, and this spring is used to cause the centrifugal blocks 302 to move a proportional distance according to the rotational speed of the fixed housing 301. A flow guide cavity 303 is provided inside the connecting column 9, and the flow guide cavity 303 communicates with the fixed housing 301 through four circumferentially distributed flow guide holes. A connecting ring 304 is rotatably connected to the column 9. The connecting ring 304 is located on the left side of the fixed shell 301. An annular cavity is provided inside the connecting ring 304. The guide cavity 303 is connected to the annular cavity of the connecting ring 304 through two symmetrically distributed guide holes. Hydraulic oil is filled into both the guide cavity 303 and the annular cavity of the connecting ring 304. The rotation speed of the connecting column 9 is detected by the centrifugal block 302 inside the fixed shell 301 to determine whether the speed of the input shaft of the generator 4 has increased to the same speed as the output shaft of the diesel engine 3.

[0037] Please refer to Figure 4 , Figure 5 and Figures 7-9As shown, the connecting assembly includes a connecting cylinder 401, which is fixed to the connecting plate 202 and located on the front side of the connecting plate 202. A piston rod 402 is slidably connected inside the connecting cylinder 401. A first guide pipe 403 is connected to the left side of the connecting cylinder 401, and the first guide pipe 403 is connected to the annular cavity of the connecting ring 304. A limit pin 404 is slidably connected to the right side of the connecting cylinder 401. A blind hole is provided on the piston rod 402, and the blind hole of the piston rod 402 is connected to the limit pin 404. A spring is fixed between the connecting cylinder 401 and the limiting pin 404 in a limiting fit. A sliding ring 405 is splined on the sliding shell 7. The sliding ring 405 can slide left and right while rotating synchronously with the sliding shell 7. The piston rod 402 slides and is limited by the mounting block with the sliding ring 405. The movement of the piston rod 402 causes the sliding ring 405 to move left and right synchronously during rotation. Two front-to-back mirror-image extrusion plates 406 are fixed on the sliding ring 405. A [missing information - likely a device or feature] is provided on the right side of the extrusion plate 406. The inclined plane has two extrusion plates 406 with a gradually decreasing distance between the inclined planes from left to right. The sliding shell 7 is slidably connected to two front-to-back mirror-image connecting rods 407. The two connecting rods 407 are located on the right side of the two extrusion plates 406. A tension spring is fixed between the connecting rods 407 and the sliding shell 7. The tension spring is initially in a stretched state. The connecting rods 407 are provided with rectangular holes, which are pressed and engaged with the corresponding extrusion plates 406. The left end of the connecting column 9 is provided with four circumferentially evenly distributed grooves. The connecting rods 407 and the adjacent grooves on the connecting column 9 are in a limiting engagement. Hydraulic oil is injected between the left side of the connecting cylinder 401 and the piston rod 402, and in the first guide pipe 403. The piston rod 402 is limited by the limiting pin 404. When the speed of the input shaft of the generator 4 is the same as the speed of the output shaft of the diesel engine 3, the connecting rod 407 is controlled to engage with the adjacent grooves on the connecting column 9, so that the output shaft of the diesel engine 3 directly drives the input shaft of the generator 4 to rotate, ensuring stable power transmission between the diesel engine 3 and the generator 4.

[0038] When this device is generating electricity in a low-temperature environment, the operator first checks the cooling system, engine oil, battery, and fuel system inside the device. After the operator has finished checking the device, the operator starts the diesel engine 3 through the control panel. The output shaft of the diesel engine 3 rotates at low speed and preheats. At this time, the output shaft of the diesel engine 3 is disconnected from the input shaft of the generator 4, and the input shaft of the generator 4 does not rotate. The exhaust gas generated by the diesel engine 3 is discharged from the sound insulation shell 2 through the exhaust pipe, and the outside gas enters the intake pipe of the diesel engine 3. When the temperature detection device inside the diesel engine 3 detects that the temperature of the engine oil and coolant has reached the set value, the control panel activates the electric push rod 201. The telescopic end of the electric push rod 201 drives the sliding shell 7 and the parts connected to it to move to the right through the connecting plate 202. When the telescopic end of the electric push rod 201 extends to the set length, the control panel closes the electric push rod 201.

[0039] During the rotation of the output shaft of the diesel engine 3, the output shaft of the diesel engine 3 drives the fixed column 6 to rotate synchronously clockwise (viewed from right to left). The fixed column 6 drives the sliding shell 7 and its parts to rotate synchronously through the spline. The connecting plate 202 does not rotate. The sliding shell 7 and the connecting plate 202 rotate relative to each other. As the diesel engine 3 works, the temperature inside the soundproof shell 2 rises. When the temperature inside the soundproof shell 2 reaches the set value, the control panel starts the cooling fan of the diesel engine 3. The heat generated by the diesel engine 3 and the generator 4 is discharged through the exhaust port on the left side of the soundproof shell 2. The low-temperature gas from the outside enters through the air intake port on the right side of the soundproof shell 2, thereby reducing the operating temperature of the diesel engine 3 and the generator 4. During the operation of this device, the noise generated by the diesel engine 3 is reflected when it passes through the exhaust port on the left side of the soundproof shell 2. At the same time, the first soundproof plate 5 reflects and disperses the sound waves entering the air intake port on the right side of the soundproof shell 2 in advance, so that the device maintains a silent working mode.

[0040] As the connecting plate 202 drives the sliding shell 7 and its connected parts to move to the right, the connecting column 9 inserts into the middle of the sliding shell 7, and the limiting block 8 contacts and presses the rotating disk 10. The limiting block 8 moves into the sliding shell 7 and compresses the connected spring. As the sliding shell 7 drives the limiting block 8 to rotate, when the limiting block 8 aligns with the through hole of the rotating disk 10, the limiting block 8 is inserted into the through hole of the rotating disk 10 under the elastic force of the connected spring. The limiting block 8 contacts and pushes the transmission block 13 to move to the right. Subsequently, the sliding shell 7 drives the rotating disk 10 to move forward through the limiting block 8. As the rotating disk 10 rotates clockwise (viewed from right to left), the fixed plate 11 rotates counterclockwise (viewed from right to left) relative to the rotating disk 10. The spring between the rotating disk 10 and the fixed plate 11 is compressed. Under the elastic force of the connected spring, the fixed plate 11 attempts to drive the connecting column 9 to rotate clockwise (viewed from right to left). As the rotating disk 10 rotates, when the sliding block 12 is aligned with the through hole of the rotating disk 10, the sliding block 12 moves to the left under the elastic force of the connected spring and inserts into the through hole of the rotating disk 10.

[0041] During the process of the sliding block 12 being inserted into the through hole of the rotating disk 10, the sliding block 12 contacts and pushes the transmission block 13 to move to the left. The transmission block 13 pushes the limiting block 8 out of the through hole of the rotating disk 10. The limiting block 8 moves into the sliding shell 7 and compresses the connected spring. When the limiting block 8 moves out of the through hole of the rotating disk 10, the rotating disk 10 rotates counterclockwise (viewed from right to left) to reset under the elastic force of the connected spring. The spring between the rotating disk 10 and the fixed plate 11 extends. At the same time, the through hole of the rotating disk 10 presses the inclined surface of the sliding block 12. The sliding block 12 moves to the right to restore the initial position. The sliding block 12 compresses the connected spring, and the sliding shell 7 continues to drive the limiting block 8 to rotate.

[0042] As the sliding shell 7 continues to drive the limiting block 8 to rotate, once the limiting block 8 and the through hole of the rotating disk 10 are aligned again, the above-mentioned operation of rotating the connecting column 9 is repeated. The sliding shell 7 intermittently drives the rotating disk 10 to rotate through the limiting block 8. The rotating disk 10 gradually drives the connecting column 9 to start rotating through the spring. The connecting column 9 drives the input shaft of the generator 4 to start rotating gradually. As the rotating disk 10 continuously acts on the connecting column 9 through the elastic force of the connected spring and the fixed plate 11, the rotation speed of the connecting column 9 and the input shaft of the generator 4 continuously increases until the rotation speed of the input shaft of the generator 4 is equal to the rotation speed of the output shaft of the diesel engine 3. The input shafts of the diesel engine 3 and the generator 4 maintain a stable speed. By moving the position of the sliding shell 7, the limiting block 8 and the rotating disk 10 cooperate with each other, allowing the rotation speed of the input shaft of the generator 4 to gradually increase to the same level as the rotation speed of the output shaft of the diesel engine 3. This enables the device to achieve the purpose of initially not connecting the output shaft of the diesel engine 3 with the input shaft of the generator 4, reducing the impact force on the output shaft of the diesel engine 3 during startup and reducing the wear risk of the diesel engine 3 and the generator 4.

[0043] During the rotation of the input shaft of generator 4, the connecting column 9 drives the fixed housing 301 to rotate, and the connecting ring 304 rotates relative to the connecting column 9. During the rotation of the fixed housing 301, the hydraulic oil in the first guide pipe 403 does not flow initially because the limiting pin 404 limits the piston rod 402. When the rotation speed of the input shaft of generator 4 reaches the set value, the four centrifugal blocks 302 in the fixed housing 301 move away from each other under the action of the connected centrifugal force. The centrifugal blocks 302 compress the springs connected to them, and the hydraulic oil on the left side of the piston rod 402 in the connecting cylinder 401 flows out. The piston rod 402 enters the fixed shell 301 through the first guide tube 403, the annular cavity of the connecting ring 304, and the guide cavity 303. The piston rod 402 moves to the left, and the blind hole of the piston rod 402 squeezes the limiting pin 404. The limiting pin 404 moves forward and compresses the connected spring. The piston rod 402 is released from the limit. The piston rod 402 drives the sliding ring 405 and the two extrusion plates 406 to move to the left synchronously through the mounting block. The connecting rod 407 loses the extrusion of the inclined surface of the adjacent extrusion plate 406. Under the tension of the connected tension spring, the connecting rod 407 moves into the sliding shell 7.

[0044] As the sliding shell 7 and the connecting column 9 rotate relative to each other, the connecting rod 407 is inserted into the groove on the left side of the connecting column 9. The fixed column 6 rotates synchronously with the connecting column 9 through the sliding shell 7 and the connecting rod 407. The output shaft of the diesel engine 3 and the input shaft of the generator 4 are stably transmitted, so that the input shaft of the generator 4 rotates at a stable and uniform speed, making the power generation of the generator 4 more stable. As the rotation of the input shaft of the generator 4 gradually increases, the generator 4 completes its own preheating operation through no-load rotation. At this time, the control panel increases the rotation speed of the output shaft of the diesel engine 3 and starts the generator 4 to generate electricity. When the device has finished working, the operator turns off the diesel engine 3 through the control panel.

[0045] When diesel engine 3 is turned off, the output shaft of diesel engine 3 gradually decreases in speed until it stops. The input shaft of generator 4 stops rotating synchronously. Centrifugal block 302 inside fixed housing 301 returns to its initial position under the elastic force of connected spring. All related parts move in the opposite direction as described above. Piston rod 402 drives sliding ring 405 to move to the right through mounting block. The inclined surface of pressing plate 406 on sliding ring 405 presses the corresponding connecting rod 407. Connecting rod 407 moves back to its original position and stretches the connected tension spring. When limit pin 404 is aligned with the blind hole of piston rod 402, limit pin 404 moves forward and inserts into blind hole of piston rod 402 under the elastic force of connected spring. Limit pin 404 re-limits piston rod 402. Finally, control panel starts electric push rod 201. After the telescopic end of electric push rod 201 drives the connected parts to return to their initial positions through connecting plate 202, control panel turns off electric push rod 201. At this point, all parts have returned to their initial positions.

[0046] Example 2: When a diesel generator set operates in a low-temperature environment, the viscosity of the diesel engine oil and coolant is likely to increase. This leads to a problem of low preheating efficiency when the diesel engine relies on the heat generated by its own rotation for preheating, which increases the start-up time of the diesel engine and increases the wear of diesel engine components.

[0047] Based on Example 1, please refer to Figure 1 , Figure 2 and Figure 10As shown, it also includes an exhaust gas guiding mechanism, which is located on the upper side of the soundproof shell 2. The exhaust gas guiding mechanism is used to reuse the heat in the exhaust gas. The exhaust gas guiding mechanism includes an exhaust gas guide shell 501, which is located above the diesel engine 3 and is fixed to the upper side of the soundproof shell 2. A filter device 502 (the filter device 502 is an existing device, represented by a rectangular block in the attached figure) is fixed inside the exhaust gas guide shell 501 to filter impurities in the exhaust gas discharged from the diesel engine 3. The exhaust gas guide shell 501 is connected to the exhaust gas pipe of the diesel engine 3. The exhaust gas moves in a serpentine manner inside the exhaust gas guide shell 501. Through continuous bending, the sound entering it is refracted and attenuated multiple times, ensuring the quietness of this device. An exhaust pipe 503 is connected to the right side of the exhaust gas guide shell 501 and is inserted into the soundproof shell 2. 03 is a three-way pipe. One port on the left side of the air guide pipe 503 is connected to the air guide shell 501, and the lower right port of the air guide pipe 503 is inserted into the sound insulation shell 2. The air guide pipe 503 is fixedly connected to the air supply pipe 504, which is connected to the intake pipe of the diesel engine 3. The air supply pipe 504 penetrates the air guide pipe 503. The part of the air supply pipe 504 inside the air guide pipe 503 is spiral-shaped, which is used to transfer the heat in the exhaust gas to the cold air flowing in the air supply pipe 504, thereby increasing the temperature of the cold air entering the diesel engine 3 and preventing the diesel engine 3 from being damaged due to excessive temperature difference. An auxiliary preheating component is provided on the upper side of the sound insulation shell 2 to control the connection status of the air guide pipe 503. The exhaust gas is introduced into the sound insulation shell 2 through the air guide pipe 503, which causes the temperature inside the sound insulation shell 2 to rise rapidly, shortening the preheating time of the diesel engine 3 and the generator 4.

[0048] Please refer to Figure 1 , Figure 2 , Figure 4 , Figure 10 and Figure 11As shown, the auxiliary preheating component includes a connecting block 601, which is fixedly connected to the upper side of the soundproof shell 2. The connecting block 601 is fixedly connected to the air guide pipe 503. The connecting block 601 has a through hole that communicates with the air guide pipe 503. A first hydraulic cylinder 602 is fixedly connected to the upper side of the soundproof shell 2. The first hydraulic cylinder 602 is connected to a second guide pipe 603, which communicates with the first guide pipe 403. A sliding plate 604 is fixedly connected to the telescopic end of the first hydraulic cylinder 602. The sliding plate 604 is slidably connected to the connecting block 601. The sliding plate 604 has a through hole that allows for sliding... The through hole of the plate 604 is connected and engaged with the through hole of the connecting block 601. Initially, the through hole of the sliding plate 604 is connected to the air guide pipe 503. The sliding plate 604 is fixedly connected to the baffle 605 through the connecting bracket. The baffle 605 is provided with a through hole, which is connected and engaged with the air guide pipe 503. Initially, the through hole of the baffle 605 blocks the pipe opening on the upper side of the air guide pipe 503. At this time, the exhaust gas entering the air guide pipe 503 directly enters the sound insulation shell 2. The first hydraulic cylinder 602 and the second guide pipe 603 are both filled with hydraulic oil. By moving the baffle 605 and the sliding plate 604, the position of the exhaust gas discharged from the air guide pipe 503 is controlled.

[0049] Repeat the above-described start-up and preheating operation for diesel engine 3. After diesel engine 3 starts, its exhaust pipe discharges the generated exhaust gas. The exhaust gas from diesel engine 3 enters the air guide shell 501. Within the air guide shell 501, the exhaust gas is filtered by the guide and filter device 502 and then enters the air guide pipe 503. The exhaust gas flows to the right within the air guide pipe 503, and finally enters the sound insulation shell 2 through the through-hole of the sliding plate 604. The heat of the exhaust gas causes the temperature inside the sound insulation shell 2 to rise rapidly, increasing the preheating speed of diesel engine 3 and generator 4, and shortening the initial preheating time of this device. Since the opening of the air duct 503 inside the soundproof housing 2 faces the generator 4, the generator 4 is preheated by the exhaust gas temperature, which prevents the lubricant at the input shaft of the generator 4 from freezing and affecting the output shaft of the diesel engine 3 to drive the input shaft of the generator 4 to rotate. Outside cold air enters the intake pipe of the diesel engine 3 through the air duct 504. The air duct 504, through its spiral part located inside the air duct 503, transfers the heat in the exhaust gas to the cold air entering the diesel engine 3, which prevents the temperature difference between the cold air and the diesel engine 3 from being too large, which could cause damage to the internal parts of the diesel engine 3.

[0050] When the electric actuator 201 is activated, the sliding housing 7, through the cooperation of the limit block 8 and the rotating disk 10, drives the input shaft of the generator 4 to rotate. If the input shaft of the generator 4 has difficulty rotating, the hydraulic oil in the fixed housing 301 and the guide cavity 303 does not flow, and the air pipe 503 continues to inject exhaust gas into the sound insulation housing 2. When the input shaft of the generator 4 rotates and its rotation speed is the same as the rotation speed of the output shaft of the diesel engine 3, the hydraulic oil in the guide cavity 303 and the first guide pipe 403 flows as described above. The hydraulic oil in the first hydraulic cylinder 602 flows into the first guide pipe 403 synchronously through the second guide pipe 603. The telescopic end of the first hydraulic cylinder 602 extends, and the sliding plate 604... The connecting frame drives the baffle 605 to move to the left along with the telescopic end of the first hydraulic cylinder 602. The part of the air guide pipe 503 located inside the soundproof shell 2 is gradually blocked, and the upper part of the air guide pipe 503 gradually opens. The air guide pipe 503 directly discharges the exhaust gas into the air, stopping the injection of exhaust gas into the soundproof shell 2. The exhaust gas is guided to flow through the air guide pipe 503. With the cooperation of the sliding plate 604 and the baffle 605 to block the air guide pipe 503, the purpose of injecting filtered exhaust gas into the soundproof shell 2 only when the diesel engine 3 is preheating is achieved. This improves the preheating speed of the diesel engine 3 and the generator 4 and avoids the situation where the input shaft of the generator 4 freezes when starting, which would affect the start-up preheating time of this device.

[0051] When the device finishes working and the input shaft of the generator 4 stops rotating, the hydraulic oil in the first hydraulic cylinder 602 flows in the reverse direction as described above. The telescopic end of the first hydraulic cylinder 602 retracts, the sliding plate 604 and the baffle 605 move and reset synchronously, and the upper side of the air pipe 503 is re-sealed while the lower side is opened.

[0052] Example 3: When the diesel generator set is started and preheated in a low-temperature environment, the diesel engine is in a low-temperature state when it starts. The diesel engine will generate more mechanical noise. At the same time, the combustion state of the diesel inside the diesel engine is unstable when it is initially started, which will lead to an increase in combustion noise. Consequently, some noise will be transmitted out of the device from the exhaust port in the soundproof shell 2, causing noise pollution to the surrounding environment.

[0053] Based on Example 2, please refer to Figure 2 , Figure 4 , Figure 10 and Figure 12As shown, it also includes an auxiliary sound insulation mechanism, which is located on the left side inside the sound insulation shell 2. The auxiliary sound insulation mechanism is used to temporarily block sound transmission through the exhaust port of the sound insulation shell 2. The auxiliary sound insulation mechanism includes a second hydraulic cylinder 701, which is fixedly connected to the left side inside the sound insulation shell 2. A connecting frame 702 is fixedly connected to the telescopic end of the second hydraulic cylinder 701. The second hydraulic cylinder 701 is connected to a third guide pipe 703, which is connected to the right side of the connecting cylinder 401. Several second sound insulation panels 704, evenly distributed vertically, are fixedly connected inside the connecting frame 702. The number of second sound insulation panels 704 and the number of exhaust ports of the sound insulation shell 2 are... The number of second sound insulation plates 704 is the same, and the distance between two adjacent second sound insulation plates 704 is the same as the distance between two adjacent exhaust holes on the sound insulation shell 2. The second sound insulation plate 704 has the same shape and function as the first sound insulation plate 5, and is used to reflect the sound waves that are about to enter the exhaust hole of the sound insulation shell 2. Hydraulic oil is filled between the right side of the connecting cylinder 401 and the piston rod 402, the second hydraulic cylinder 701 and the third guide pipe 703. By moving the position of the connecting frame 702 and several second sound insulation plates 704, the sound insulation effect at the exhaust hole of the sound insulation shell 2 is enhanced when the internal noise of the device increases during the initial start-up, so as to ensure the stability of the device in a silent state.

[0054] When the diesel engine 3 starts, several second sound insulation plates 704 on the connecting frame 702 correspond to adjacent exhaust ports. The second sound insulation plates 704 reflect the noise generated inside the sound insulation shell 2, reducing the magnitude of the sound waves entering the exhaust ports of the sound insulation shell 2. During the process of the diesel engine 3 driving the input shaft of the generator 4 to rotate after preheating, when the rotation speed of the input shaft of the generator 4 reaches the set value, the hydraulic oil in the guide cavity 303 and the first guide pipe 403 flows, the piston rod 402 in the connecting cylinder 401 moves to the left, and the hydraulic oil in the second hydraulic cylinder 701 flows into the connecting cylinder 4 through the third guide pipe 703. On the right side of the inner piston rod 402, the telescopic end of the second hydraulic cylinder 701 retracts, causing the connecting frame 702 to move upward. The second sound insulation plate 704 is misaligned with the corresponding exhaust hole on the sound insulation shell 2, facilitating the diesel engine 3 cooling fan to inject heat from the sound insulation shell 2 into the exhaust hole, ensuring stable heat dissipation within the device. Through the movement of the connecting frame 702 and several second sound insulation plates 704, the sound insulation effect of the exhaust hole on the sound insulation shell 2 is temporarily enhanced, effectively ensuring the sound insulation effect of the device when the diesel engine 3 is noisy during startup, and ensuring the quiet operation of the device.

[0055] When the device finishes generating electricity and the input shaft of the generator 4 stops rotating, the hydraulic oil in the third guide pipe 703 flows in the reverse direction as described above, and the telescopic end of the second hydraulic cylinder 701 extends and drives the connecting frame 702 and several second sound insulation plates 704 to return to their initial positions.

[0056] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A silent diesel generator set for low-temperature environments, comprising a mounting base (1), a soundproof shell (2) mounted on the mounting base (1), a diesel engine (3) and a generator (4) fixedly connected to the mounting base (1), and the soundproof shell (2) having uniformly distributed exhaust holes and uniformly distributed air intake holes, characterized in that: It also includes a uniformly distributed first sound insulation plate (5), which is fixed to the air inlet of the sound insulation shell (2). The output shaft of the diesel engine (3) is fixedly connected to a fixed column (6), which is splined to a sliding shell (7). A limit block (8) is slidably connected inside the sliding shell (7). The input shaft of the generator (4) is fixedly connected to a connecting column (9), which is rotatably connected to a rotating disk (10). The connecting column (9) is fixedly connected to a fixed plate (11) that is slidably connected to the rotating disk (10). A spring is fixed between the plate (11) and the rotating disk (10). The connecting column (9) is slidably connected to the sliding block (12) which is pressed against the rotating disk (10) through the connecting frame. The rotating disk (10) is provided with a through hole that is limited to the limiting block (8). The rotating disk (10) is slidably connected with a transmission block (13) that is pressed against the sliding block (12) in the through hole. The transmission block (13) is pressed against the limiting block (8). The diesel engine (3) is provided with a transmission control mechanism for driving the input shaft of the generator (4) to rotate. The transmission control mechanism includes an electric push rod (201), which is fixed to the diesel engine (3) near its output shaft. The telescopic end of the electric push rod (201) is fixed to a connecting plate (202) that is limited and rotatably connected to the sliding shell (7). A temperature detection device is provided at the flow point of the oil and coolant in the diesel engine (3). The exhaust pipe and intake pipe of the diesel engine (3) both penetrate the sound insulation shell (2). A spring is fixed between the sliding shell (7) and the limiting block (8). A spring is fixed between the sliding block (12) and the connecting column (9). A speed detection component for detecting the speed of the input shaft of the generator (4) is provided on the connecting column (9). A connecting component for moving the position of the sliding shell (7) is provided on the connecting plate (202). The speed detection component includes a fixed shell (301), which is fixedly connected to the connecting column (9) on the side near the generator (4). Centrifugal blocks (302) are slidably connected inside the fixed shell (301) and are evenly distributed in the circumferential direction. A spring is fixed between the centrifugal blocks (302) and the fixed shell (301). A flow guide cavity (303) is provided inside the connecting column (9). The flow guide cavity (303) is connected to the fixed shell (301) through circumferentially distributed flow guide holes. A connecting ring (304) is rotatably connected to the connecting column (9). An annular cavity is provided inside the connecting ring (304). The flow guide cavity (303) is connected to the annular cavity of the connecting ring (304) through symmetrically distributed flow guide holes. Hydraulic oil is filled into both the flow guide cavity (303) and the annular cavity of the connecting ring (304). The connecting assembly includes a connecting cylinder (401), which is fixedly connected to the connecting plate (202). A piston rod (402) is slidably connected inside the connecting cylinder (401). A first guide pipe (403) communicating with the annular cavity of the connecting ring (304) is connected to the side of the connecting cylinder (401) near the diesel engine (3). A limit pin (404) is slidably connected to the side of the connecting cylinder (401) away from the diesel engine (3). A blind hole is provided on the piston rod (402) to limit the movement of the limit pin (404). A spring is fixedly connected between the connecting cylinder (401) and the limit pin (404). A sliding ring (405) is splinedly connected to the sliding shell (7). The piston rod (402) is connected to the sliding ring (405) via a mounting block. The sliding ring (405) is fixedly connected to a mirror-shaped extrusion plate (406). The side of the extrusion plate (406) away from the sliding ring (405) is provided with an inclined surface. The sliding shell (7) is slidably connected to a mirror-shaped connecting rod (407). A tension spring is fixed between the connecting rod (407) and the sliding shell (7). The connecting rod (407) is provided with a rectangular hole that is extruded and engaged with the corresponding extrusion plate (406). The end of the connecting column (9) near the diesel engine (3) is provided with a circumferentially evenly distributed groove. The connecting rod (407) is limited and engaged with the adjacent groove on the connecting column (9). Hydraulic oil is injected into the connecting cylinder (401) near the diesel engine (3) between the piston rod (402) and the first guide pipe (403).

2. A silent diesel generator set for low-temperature environments according to claim 1, characterized in that: The cross-sectional shape of the exhaust hole on the soundproof shell (2) is wavy, which is used to reflect and reduce the size of the sound waves passing through it.

3. A silent diesel generator set for low-temperature environments according to claim 1, characterized in that: The first sound insulation plate (5) has an arc-shaped cross-section, with the concave side of the first sound insulation plate (5) facing downwards. The projected area of ​​the first sound insulation plate (5) in the vertical direction is larger than the cross-sectional area of ​​the air inlet of the sound insulation shell (2), which is used to reduce the magnitude of the sound waves passing through the air inlet of the sound insulation shell (2).

4. A silent diesel generator set for low-temperature environments according to claim 1, characterized in that: The sliding block (12) has an inclined surface on the side near the rotating disk (10). The inclined surface of the sliding block (12) is pressed and engaged with the through hole of the rotating disk (10) so that the sliding block (12) can be reset synchronously when the rotating disk (10) is reset.

5. A silent diesel generator set for low-temperature environments according to claim 4, characterized in that: It also includes an exhaust gas guiding mechanism, which is disposed on the upper side of the sound insulation shell (2). The exhaust gas guiding mechanism is used to reuse the heat in the exhaust gas. The exhaust gas guiding mechanism includes a gas guide shell (501), which is fixed to the upper side of the sound insulation shell (2). A filter device (502) is fixed inside the gas guide shell (501). The gas guide shell (501) is connected to the exhaust pipe of the diesel engine (3). One side of the gas guide shell (501) is connected to... There is an air guide pipe (503), which is inserted into the soundproof shell (2). The air guide pipe (503) is fixedly connected to an air supply pipe (504) that communicates with the intake pipe of the diesel engine (3). The air supply pipe (504) penetrates the air guide pipe (503). The part of the air supply pipe (504) located inside the air guide pipe (503) is spiral. An auxiliary preheating component for controlling the communication state of the air guide pipe (503) is provided on the upper side of the soundproof shell (2).

6. A silent diesel generator set for low-temperature environments according to claim 5, characterized in that: The auxiliary preheating component includes a connecting block (601), which is fixedly connected to the upper side of the soundproof shell (2). The connecting block (601) is also fixedly connected to the air guide pipe (503). The connecting block (601) has a through hole communicating with the air guide pipe (503). A first hydraulic cylinder (602) is fixedly connected to the upper side of the soundproof shell (2). The first hydraulic cylinder (602) is connected to a second guide pipe (603) communicating with the first guide pipe (403). The telescopic end of the first hydraulic cylinder (602) is fixedly connected to a sliding plate (604) that is slidably connected to the connecting block (601). The sliding plate (604) is provided with a through hole that communicates with and cooperates with the through hole of the connecting block (601). The sliding plate (604) is fixedly connected to a baffle (605) through a connecting frame. The baffle (605) is provided with a through hole that communicates with and cooperates with the air guide pipe (503). Both the first hydraulic cylinder (602) and the second air guide pipe (603) are filled with hydraulic oil.

7. A silent diesel generator set for low-temperature environments according to claim 6, characterized in that: It also includes an auxiliary sound insulation mechanism (70), which is disposed inside the sound insulation shell (2) on the side near the diesel engine (3). The auxiliary sound insulation mechanism (70) is used to temporarily block the sound transmission of the exhaust port of the sound insulation shell (2). The auxiliary sound insulation mechanism (70) includes a second hydraulic cylinder (701), which is fixedly connected inside the sound insulation shell (2) on the side near the diesel engine (3). The telescopic end of the second hydraulic cylinder (701) is fixedly connected to a connecting frame (702). The two hydraulic cylinders (701) are connected to a third guide pipe (703) that is connected to the side of the connecting cylinder (401) away from the diesel engine (3). The connecting frame (702) is fixed with a uniformly distributed second sound insulation plate (704). The second sound insulation plate (704) has the same shape and function as the first sound insulation plate (5). Hydraulic oil is filled in the connecting cylinder (401) between the side away from the diesel engine (3) and the piston rod (402), as well as in the second hydraulic cylinder (701) and the third guide pipe (703).

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