Noise reduction and sound insulation cover of vehicle-mounted compressor

Abstract

The utility model discloses a noise reduction and sound insulation cover of a vehicle-mounted compressor, which relates to the technical field of sound insulation equipment of the vehicle-mounted compressor for oil and gas field exploitation, and comprises a main frame body, a sound absorption and insulation module I arranged on the wall surface of the main frame body, a sound absorption and insulation module II arranged on the top surface of the main frame body, and an air inlet silencer arranged at an air cooler on the outer side of the wall surface of the main frame body, an air exhaust silencer and a silencing guide cylinder are designed at the air exhaust position of a roof air cooler of the main frame body, a fan silencer is arranged in the main frame body, a connecting pipeline is used at an outlet of an original engine smoke exhaust silencer to lead out a sound insulation cover, and an engine secondary silencer is arranged at a connecting pipeline opening of a roof. A process gas emptying silencer is arranged on an emptying pipe of the compressor, a plurality of sound insulation doors are arranged on the main frame body, and the problems that in the prior art, noise of vehicle-mounted compressors exploited in oil and gas fields is too large, and the requirement of the noise emission limit standard is not met are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of sound insulation equipment for a vehicle-mounted compressor used in oil and gas field development, in particular to a noise reduction and sound insulation cover for a vehicle-mounted compressor. Background Art

[0002] When the vehicle-mounted compressor unit used in oil and gas field development is in operation, its noise is generated by mechanical vibrations such as the engine exhaust port, engine power cylinder, compression cylinder, air cooler, air filter, intake manifold, middle body, flywheel, etc.; the noise is mostly medium and low frequency, and its characteristics are long propagation distance and large diffraction range. During the operation of the vehicle-mounted compressor, although the truck tires can reduce the vibration of the unit, the noise value generated during the operation of the engine, compressor, etc. is about 95dB (A), which does not meet the emission limit value standard requirements of Class 3 noise in GB12348-2008. Some work sites are located in environmentally sensitive areas. In order to improve the working environment and the relationship between enterprises and the local area, and to protect the physical and mental health of employees and surrounding residents, it is very important to control the noise of vehicle-mounted compressors.

[0003] Truck-mounted compressors are widely used in the drainage work of flooded wells in various large gas mines of oil and gas field mining related enterprises, and are one of the most important measures for natural gas lift production increase. Truck-mounted compressor units operate more than 150 wells per year, and the annual gas production increased by gas lift is nearly 100 million cubic meters. They are important equipment to ensure the increase of natural gas production in gas mines. Therefore, it is very important to ensure that the truck-mounted compressor units run continuously and smoothly day and night, which can improve the effect of gas lift operations.

[0004] Due to the particularity of the operation of vehicle-mounted compressors, the team operators are required to be on duty and conduct uninterrupted inspections. The team operators are exposed to high-decibel noise for a long time, which can easily cause hearing loss or even tinnitus and deafness. In more serious cases, it can lead to occupational diseases such as high blood pressure, arrhythmia and heart function decline. In order to create a good working environment for the operators and prevent occupational hazards, it is very necessary to control the noise of vehicle-mounted compressor units. Utility Model Content

[0005] The inventor of the utility model considers controlling noise from the sound source according to the inherent engine and compressor structure of the vehicle-mounted compressor, including silencing from the engine and air cooler; controlling noise from the propagation path: adopting sound insulation, vibration isolation and sound absorbing module materials to control noise.

[0006] The utility model aims to solve the problem that the noise of vehicle-mounted compressors used in the exploitation of various oil and gas fields in the prior art is too loud and does not meet the emission limit standard requirements of Class 3 noise in GB12348-2008. A vehicle-mounted compressor noise reduction and sound insulation cover is proposed. After using the device for noise reduction, nearby residents did not report any noise problems, and the maximum noise during the day and at night measured in sensitive point areas and employee activity rooms were 51.0dB (A) and 46.8dB (A) respectively, which meets the emission limit requirements of Class 2 noise in GB12348-2008 "Environmental Noise Emission Standards for Industrial Enterprises at Factory Boundaries", thereby achieving effective control of excessive noise at the operation site of the vehicle-mounted compressor.

[0007] In order to achieve the above-mentioned invention object, the technical solution of the utility model is as follows:

[0008] The vehicle-mounted compressor noise reduction and soundproofing cover comprises a main frame, the wall of the main frame is provided with a sound-absorbing and insulating module I, the top of the main frame is provided with a sound-absorbing and insulating module II, an air inlet silencer is provided at the air cooler on the outer wall of the main frame, an exhaust silencer and a silencer guide tube are designed at the exhaust position of the air cooler on the roof of the main frame, a fan silencer is provided in the main frame, a connecting pipeline is used to lead out the soundproofing cover at the outlet of the original engine exhaust silencer, and an engine secondary silencer is arranged at the connecting pipeline outlet on the roof, a process gas exhaust silencer is provided on the vent pipe of the compressor, and a plurality of soundproofing doors are opened on the main frame.

[0009] Furthermore, the main frame includes columns and beams. The columns and beams of the main frame are made of H-shaped steel made of Q235B material. The columns are connected and fixed to the concrete floor of the ground by anchor bolts.

[0010] Furthermore, the surface of the main frame is provided with a paint film layer, and the paint film layer is a layer structure with a total thickness of ≥120 μm and a rust removal grade of Sa2.5.

[0011] Furthermore, an observation window is arranged on the soundproof door, and the observation window is made of double-layer hollow tempered glass, and the glass is tempered glass with a thickness of 5 mm.

[0012] Furthermore, the air inlet silencer on each side includes two silencers arranged at the upper and lower parts.

[0013] Furthermore, a manual aluminum alloy rainproof and noise-reducing shutter is installed at the air inlet of the air inlet silencer.

[0014] Furthermore, a rain cap is installed at the outlet of the fan muffler.

[0015] Furthermore, a guide cover is installed between the air outlet of the air cooler on the roof and the silencer guide tube.

[0016] Furthermore, a canopy is provided at the exhaust port of the connecting pipeline.

[0017] Furthermore, the process gas venting silencer includes an upper cover plate, a lower cover plate, an outer pipe, an air inlet pipe, a baffle, a filter plate and a flip shaft, and the air inlet pipe is connected to the venting pipeline of the compressor unit.

[0018] Beneficial effects of the utility model:

[0019] 1. In the utility model, a noise reduction and soundproofing cover for a vehicle-mounted compressor is proposed, comprising a main frame, and sound absorption and insulation modules I and II installed on the main frame, forming the walls and roof of the soundproofing cover, and an air inlet silencer, an exhaust silencer and a soundproofing guide tube, a fan silencer, an engine secondary silencer, a process gas venting silencer and a soundproofing door installed at a specific position. The utility model is a mobile and detachable soundproofing cover suitable for a vehicle-mounted compressor, which is easy to use and adaptable to the characteristics of rapid installation of the vehicle-mounted compressor.

[0020] 2. In the utility model, a process gas venting silencer is provided on the venting pipe of the vehicle-mounted compressor. The preferred structure of the process gas venting silencer includes an upper cover plate, a lower cover plate, an outer tube, an air intake pipe, a baffle, a filter plate and a flip shaft. The air intake pipe is connected to the venting pipeline of the compressor unit. Resistive silencer is achieved through energy attenuation and three-fold baffles, and reactive silencer is achieved through the filter plate, thereby finally achieving the purpose of impedance composite silencer.

[0021] 3. In the present invention, the vehicle-mounted compressor noise reduction and soundproof enclosure adopts the main frame as the main supporting frame, the main frame mainly includes columns and beams, the columns are connected and fixed to the ground concrete floor by anchor bolts, modular sound absorption and insulation module I is installed on the periphery of the main frame, modular sound absorption and insulation module II is installed on the top, and connected and fixed by fasteners, so that the noise reduction and soundproof enclosure can be quickly installed and reused, which meets the characteristics of the device used in oil and gas field development. In addition, in order to ensure the sound insulation effect, the sound absorption and insulation module I and the sound absorption and insulation module II preferably adopt high sound insulation modules with a weighted sound insulation greater than 40dB (A).

[0022] 4. In this embodiment, the noise source of the vehicle-mounted compressor is analyzed. The noise source can be controlled from the engine muffler, air cooler, and compressor process gas vent. From the noise spectrum analysis, the unit noise presents the characteristics of wide frequency band, high frequency, medium frequency, and low frequency. Sound insulation, vibration isolation, and sound absorption are carried out on the propagation path to reduce the characteristics of high-frequency, medium-frequency, and low-frequency sound intensity of the unit. Therefore, a noise reduction structure is designed at a suitable position, with good noise reduction effect, and the original device structure is not changed, which is convenient for promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the utility model.

[0024] Figure 2It is a partial schematic diagram of the sound-absorbing and insulating module I on the wall.

[0025] Figure 3 It is a partial schematic diagram of the sound-absorbing and sound-insulating module I at the corner of the wall.

[0026] Figure 4 This is a diagram showing the connections at the air inlet silencer.

[0027] Figure 5 It is a layout diagram of the noise reduction and sound insulation enclosure.

[0028] Figure 6 It is the layout of the axial elevation of the noise reduction soundproof enclosure Figure 1 .

[0029] Figure 7 It is the layout of the axial elevation of the noise reduction soundproof enclosure Figure 2 .

[0030] Figure 8 It is the layout of the axial elevation of the noise reduction soundproof enclosure Figure 3 .

[0031] Fig. 9 It is a structural diagram of the process gas vent silencer.

[0032] Fig.10 yes Fig. 9 AA section view.

[0033] Fig.11 yes Fig. 9 BB cross-sectional view.

[0034] Fig.12 yes Fig. 9 CC cross-sectional view.

[0035] Among them, 1. Main frame; 2. Sound absorption and insulation module I; 3. Sound absorption and insulation module II; 4. Air intake silencer; 5. Exhaust silencer; 6. Silence guide tube; 7. Fan silencer; 8. Connecting pipeline; 9. Engine secondary silencer; 10. Process gas vent silencer; 11. Sound insulation door; 12. Vent pipe; 13. Rainproof and soundproof shutters; 14. Rainproof cap; 1.1. Column; 10.1. Upper cover plate; 10.2. Lower cover plate; 10.3. Outer pipe; 10.4. Air intake pipe; 10.5. Baffle plate; 10.6. Filter plate; 10.7. Flip axis. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the embodiments, but the implementation manner of the present invention is not limited thereto.

[0037] Example 1

[0038] This embodiment is a basic implementation method, a vehicle-mounted compressor noise reduction sound insulation cover, which relates to the technical field of sound insulation equipment for vehicle-mounted compressors used in oil and gas field development, and refers to Figure 1-12 , including a main frame 1, which is the main supporting frame of the noise reduction soundproof cover, a sound absorption and insulation module Ⅰ2 is provided on the wall of the main frame 1, a sound absorption and insulation module Ⅱ3 is provided on the top of the main frame 1, an air inlet silencer 4 is provided at the air cooler outside the wall of the main frame 1, an exhaust silencer 5 and a silencer guide tube 6 are designed at the exhaust position of the air cooler on the roof of the main frame 1, a fan silencer 7 is provided in the main frame 1, a connecting pipeline 8 is used to lead out of the soundproof cover at the outlet of the original engine exhaust silencer, and an engine secondary silencer 9 is provided at the connecting pipeline 8 on the roof, a process gas exhaust silencer 10 is provided on the vent pipe 12 of the compressor, and a plurality of soundproof doors 11 are opened on the main frame 1.

[0039] In this embodiment, the sound absorption and insulation module I2 and the sound absorption and insulation module II3 are assembled and connected using a standardized module structure. The weighted sound insulation of the sound absorption and insulation module I2 and the sound absorption and insulation module II3 is greater than 40dB (A). Under the premise of ensuring the sound absorption and sound insulation effects, the structure is as simple as possible. Each module structure is designed with a lifting nut M20, which can be connected through a lifting ring for modular installation. The module is connected to the main frame 1 through a connector on site.

[0040] Example 2

[0041] This embodiment is a further optimization of the embodiment 1, and the difference lies in that the main frame 1 mainly includes columns and beam structures, the columns and beams are made of H-shaped steel of Q235B material, and the columns are connected and fixed to the ground concrete floor with anchor bolts, which is convenient for on-site installation and can be repeatedly disassembled and installed quickly.

[0042] Example 3

[0043] The present embodiment is different from Embodiment 1-2 in that the surface of the main frame 1 has a paint film layer, and the paint film layer has a layer structure with a total thickness of ≥120 μm and a rust removal grade of Sa2.5, thereby achieving waterproof and anti-corrosion effects.

[0044] Example 4

[0045] The difference between this embodiment and embodiments 1-3 is that an observation window is provided on the soundproof door 11. Figure 6 , convenient for daily inspections, the observation window is made of double-layer hollow tempered glass, the glass is 5mm thick tempered glass, and the sound insulation door 11-weighted sound insulation ≥40dB (A).

[0046] Example 5

[0047] The present embodiment is different from Embodiments 1 to 4 in that the air inlet silencer 4 on each side includes two silencers arranged at the upper and lower parts, so that the sound reduction is ≥35dB(A).

[0048] Example 6

[0049] The difference between this embodiment and embodiments 1-5 is that, Figure 1 A manual aluminum alloy rainproof and noise-reducing shutter 13 is installed at the air inlet of the air inlet silencer 4, and the position of the shutter can be adjusted according to the air volume.

[0050] Example 7

[0051] The difference between this embodiment and the embodiments 1-6 is that the outlet of the fan muffler 7 is equipped with a rainproof cap 14, see Figure 8 , ensuring that rainwater does not flow into the noise reduction and sound insulation cover from the fan silencer 7.

[0052] Example 8

[0053] The present embodiment is different from Embodiments 1-7 in that, in order to facilitate the exhaust of all the hot air discharged from the air cooler into the noise reduction and sound insulation cover, a guide cover is installed between the exhaust port of the air cooler on the roof and the silencer guide tube 6.

[0054] Example 9

[0055] The present embodiment is different from Embodiments 1-8 in that a connecting pipeline 8 is used to lead out of the soundproof enclosure at the outlet of the original engine exhaust muffler, and an engine secondary muffler 9 is arranged at the outlet of the connecting pipeline 8 on the roof so that the noise reduction is ≥35dB(A), and a rainproof canopy is designed at the exhaust port to ensure that rainwater does not flow into the soundproof enclosure from the engine secondary muffler 9.

[0056] Example 10

[0057] Compared with embodiments 1-9, the present embodiment is different in that the process gas venting silencer 10 includes an upper cover plate 10.1, a lower cover plate 10.2, an outer tube 10.3, an air inlet pipe 10.4, a baffle 10.5, a filter plate 10.6 and a flip shaft 10.7, and the air inlet pipe 10.4 is connected to the vent pipe 12 of the compressor unit.

[0058] refer to Figure 2, the raw gas is discharged from the inlet pipe 10.4 into the outer pipe 10.3. Since the inner diameter of the outer pipe 10.3 is larger than that of the inlet pipe 10.4, the energy attenuation of the raw gas is achieved; then the raw gas is discharged from the outlet hole of the first layer of baffles 10.5, impacting the second layer of baffles 10.5, achieving the second energy attenuation of the raw gas; then the raw gas is discharged from the outlet hole of the second layer of baffles 10.5, impacting the third layer of baffles 10.5, achieving the third energy attenuation of the raw gas; finally, the raw gas is discharged from the outlet of the upper cover plate 10.1, impacting the filter plate 10.6 to drive the flip shaft 10.7 to open the exhaust channel and achieve external venting. Resistive silencing is achieved through energy attenuation and three baffles, and finally, reactive silencing is achieved through the filter plate 10.6, and finally the purpose of impedance composite silencing is achieved. According to actual measurement, the silencing volume can reach about 25-40dB (A).

[0059] Embodiment 11

[0060] This embodiment proposes a relatively good noise reduction and sound insulation cover for a vehicle-mounted compressor, which relates to the technical field of sound insulation equipment for vehicle-mounted compressors used in oil and gas field development. Figure 1-8 , including a main frame 1, a wall surface of the main frame 1 is provided with a sound absorbing and insulating module Ⅰ2, and a top surface of the main frame 1 is provided with a sound absorbing and insulating module Ⅱ3.

[0061] In this embodiment, the sound absorption and insulation module I2 and the sound absorption and insulation module II3 are assembled and connected using a standardized module structure. The weighted sound insulation of the sound absorption and insulation module I2 and the sound absorption and insulation module II3 is greater than 40dB (A). Under the premise of ensuring the sound absorption and sound insulation effects, the structure is as simple as possible. Each module structure is designed with a lifting nut M20, which can be connected through a lifting ring for modular installation. The module is connected to the main frame 1 through a connector on site.

[0062] In this embodiment, the main frame 1 mainly includes columns and beams. The columns and beams are made of H-shaped steel HM194×150×6×9, the material is Q235B, the columns are connected to the ground concrete floor with chemical anchors M20×260, and the remaining joints are connected with bolts, which is convenient for on-site installation and can be repeatedly disassembled and installed quickly.

[0063] In this embodiment, the surface of the main frame 1 has a paint film layer, and the paint film layer is a layer structure with a total thickness of ≥120μm and a rust removal grade of Sa2.5. Specific operation method: use epoxy zinc-rich primer twice to form a primer layer with a thickness of 40μm; then use epoxy intermediate paint spray twice to form an intermediate layer with a thickness of 40μm; finally, use acrylic polyurethane topcoat spray twice to form a topcoat layer with a thickness of 40μm, and the total dry film thickness is ≥120μm.

[0064] Air inlet silencers 4 are provided at the air cooler positions on both sides of the wall outside the main frame 1. The air inlet silencers 4 on each side include upper and lower silencers, for a total of 4 silencers. The outer dimensions of the silencer are 4150mm×1700mm×2500mm, and the sound attenuation is ≥35dB(A). The air inlet silencer 4 is connected to the column of the main frame 1 through a connector. Manual aluminum alloy rainproof and sound-absorbing shutters 13 are installed at the air inlet of the air inlet silencer 4, and the position of the shutters can be adjusted according to the air volume.

[0065] An exhaust silencer 5 and a silencer guide tube 6 are designed at the exhaust position of the air cooler on the roof of the main frame 1. There are two sets of exhaust silencers 5, and the outer dimensions of the silencer are 4150mm×1700mm×3000mm. A rain cap is installed at the outlet of the exhaust silencer to prevent rainwater from entering; the outer dimensions (length*width*height) of the silencer guide tube 6 are 4150mm*1700mm*3600mm, and the sound reduction of the exhaust silencer 5 and the silencer guide tube 6 is ≥35dB(A). The exhaust silencer 5 is connected to the beam of the main frame 1 through a connector. In order to facilitate the discharge of all the hot air discharged from the air cooler into the noise reduction and sound insulation cover, a guide cover is also installed between the air cooler exhaust port and the silencer guide tube 6.

[0066] Three fan silencers 7 are arranged in the main frame 1, which are used for noise reduction during heat exchange of the vehicle compressor in the noise reduction soundproof enclosure. The outer dimensions of the fan silencer 7 are 1500mm×1000mm×3500mm, and the silencer volume is ≥35dB(A). A rain cap 14 is designed and installed at the outlet of the fan silencer 7 to ensure that rainwater does not flow from the fan silencer 7 into the noise reduction soundproof enclosure.

[0067] A connecting pipe 8 is used to lead out the soundproof cover at the outlet of the original engine exhaust silencer, and an engine secondary silencer 9 is installed at the outlet of the connecting pipe 8 on the roof, with a noise reduction of ≥35dB(A), wherein the total back pressure of the engine secondary silencer 9 is ≤3kPa, and a rainproof canopy is designed at the exhaust port to ensure that rainwater does not flow into the soundproof cover from the engine secondary silencer 9.

[0068] In this embodiment, for the purpose of daily equipment inspection and maintenance and escape, three single-opening soundproof doors 11 with high sound insulation are arranged on the noise reduction soundproof enclosure, and the weighted sound insulation of the soundproof door 11 is ≥40dB (A); an observation window is arranged on the soundproof door 11, and the observation window adopts double-layer hollow tempered glass, and the glass adopts tempered glass with a thickness of 5mm. The door lock of the soundproof door 11 adopts a push rod lock to ensure that people in the soundproof enclosure can enter and exit safely.

[0069] In this embodiment, a process gas exhaust muffler 10 is provided on the exhaust pipe 12 of the compressor. Figure 9-12The process gas venting silencer 10 comprises an upper cover plate 10.1, a lower cover plate 10.2, an outer tube 10.3, an air inlet pipe 10.4, a baffle plate 10.5, a filter plate 10.6 and a flip shaft 10.7, and the air inlet pipe 10.4 is connected to the venting pipe 12 of the compressor unit. Figure 2 , the raw gas is discharged from the inlet pipe 10.4 into the outer pipe 10.3. Since the inner diameter of the outer pipe 10.3 is larger than that of the inlet pipe 10.4, the energy attenuation of the raw gas is achieved; then the raw gas is discharged from the outlet hole of the first layer of baffles 10.5, impacting the second layer of baffles 10.5, achieving the second energy attenuation of the raw gas; then the raw gas is discharged from the outlet hole of the second layer of baffles 10.5, impacting the third layer of baffles 10.5, achieving the third energy attenuation of the raw gas; finally, the raw gas is discharged from the outlet of the upper cover plate 10.1, impacting the filter plate 10.6 to drive the flip shaft 10.7 to open the exhaust channel and achieve external venting. Resistive silencing is achieved through energy attenuation and three baffles, and finally, reactive silencing is achieved through the filter plate 10.6, and finally the purpose of impedance composite silencing is achieved. According to actual measurement, the silencing volume can reach about 25-40dB (A).

[0070] In this embodiment, after the vehicle-mounted compressor uses the noise reduction and sound insulation cover, the engine color is normal, and the engine water temperature, oil pressure, oil temperature and exhaust temperatures of each level of the compressor are almost unchanged. That is, before and after the use of the sound insulation cover, there is almost no impact on the original working conditions of the unit, which further verifies the reliability of the unit operation after the installation of the noise reduction and sound insulation cover.

[0071] In addition, after the noise reduction and sound insulation cover was used to reduce the noise of the on-board compressor, nearby residents no longer reported noise problems, and the maximum noise levels during the day and night measured in sensitive areas and employee activity rooms were 51.0dB (A) and 46.8dB (A) respectively, which fully complies with the emission limit requirements for Class 2 noise in GB12348-2008 "Environmental Noise Emission Standards for Industrial Enterprises at Factory Boundaries", and effectively controls the excessive noise at the on-board compressor operation site.

Claims

1. The vehicle-mounted compressor noise reduction and sound insulation cover is characterized by: The invention comprises a main frame (1), a sound absorbing and insulating module I (2) is provided on the wall of the main frame (1), a sound absorbing and insulating module II (3) is provided on the top surface of the main frame (1), an air inlet silencer (4) is provided at the air cooler on the outer wall of the main frame (1), an exhaust silencer (5) and a silencer guide tube (6) are designed at the exhaust position of the air cooler on the roof of the main frame (1), a fan silencer (7) is provided inside the main frame (1), a soundproof cover is led out of the original engine exhaust silencer outlet using a connecting pipeline (8), and an engine secondary silencer (9) is provided at the outlet of the connecting pipeline (8) on the roof, a process gas exhaust silencer (10) is provided on the exhaust pipe (12) of the compressor, and a plurality of soundproof doors (11) are opened on the main frame (1).

2. The vehicle-mounted compressor noise reduction and sound insulation cover according to claim 1, characterized in that: The main frame (1) comprises columns and beams. The columns and beams of the main frame (1) are made of H-shaped steel made of Q235B material. The columns are connected and fixed to the concrete floor by anchor bolts.

3. The vehicle-mounted compressor noise reduction and sound insulation cover according to claim 2, characterized in that: The surface of the main frame (1) is provided with a paint film layer, and the paint film layer is a layer structure with a total thickness of ≥120 μm and a rust removal grade of Sa2.

5.

4. The vehicle-mounted compressor noise reduction and sound insulation cover according to claim 1, characterized in that: An observation window is provided on the soundproof door (11), and the observation window is made of double-layer hollow tempered glass, and the glass is tempered glass with a thickness of 5 mm.

5. The vehicle-mounted compressor noise reduction and sound insulation cover according to claim 1, characterized in that: The air inlet silencer on each side includes two silencers arranged at the upper and lower parts.

6. The vehicle-mounted compressor noise reduction and sound insulation cover according to claim 5, characterized in that: A manual aluminum alloy rainproof and noise-reducing shutter (13) is installed at the air inlet of the air inlet silencer.

7. The vehicle-mounted compressor noise reduction and sound insulation cover according to claim 1, characterized in that: The outlet of the fan silencer is provided with a rainproof cap (14).

8. The vehicle-mounted compressor noise reduction and sound insulation cover according to claim 7, characterized in that: An air guide cover is installed between the air outlet of the air cooler on the roof and the silencer guide tube (6).

9. The vehicle-mounted compressor noise reduction and sound insulation cover according to claim 1, characterized in that: A canopy is provided at the exhaust port of the connecting pipeline (8).

10. The vehicle-mounted compressor noise reduction and sound insulation cover according to claim 1, characterized in that: The process gas venting silencer (10) comprises an upper cover plate (10.1), a lower cover plate (10.2), an outer tube (10.3), an air inlet pipe (10.4), a baffle plate (10.5), a filter plate (10.6) and a flip shaft (10.7); the air inlet pipe (10.4) is connected to a venting pipe (12) of a compressor unit.

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