Each diesel generator set will produce a lot of noise after starting In order to reduce noise, many diesel generator sets purchased by schools, hospitals, hotels, guest houses and other places have added boxes silent, so the diesel generator set. can be reduced appropriately. The noise of the generator is higher, but the cost of the silent box is higher. The price of a 30 kW diesel generator is basically the same as the silent box, which invisibly increases the cost, and. many companies cannot afford it. How can we reduce the noise of diesel generators more efficiently and economically? Huaquan Dynamics teaches you some tricks. ⒈Reduce exhaust noise. Exhaust noise is the main source of noise from the unit. It is characterized by a high noise level, a fast exhaust speed and udifficult management. Using a special impedance-type composite silencer can generally reduce exhaust noise by 40-60 dB(a). ⒉ Reduce the noise of the axial flow fan. When reducing generator cooling fan noise, two issues need to be considered. One is the allowable pressure loss in the exhaust channel. The second is the required amount of noise reduction. For both points above, resistive chip silencers can be used. ⒊Sound insulation, sound absorption treatment and vibration insulation of the engine room (1) Sound insulation of the engine room. After the unit's exhaust noise and cooling fan noise are reduced, the main remaining noise sources are diesel engine mechanical noise and combustion noise. The method adopted is to remove all windows except the windowss necessary interior wall observation rooms connected to the observation room, all holes and holes must be tightly sealed, and the sound insulation of the brick wall must be greater than 40 dB (a). The doors and windows of the computer room adopt fireproof and soundproof doors and windows. (2) Air inlet and outlet. After the sound insulation treatment of the computer room, the ventilation and heat dissipation problem in the computer room needs to be solved. The air inlet must be placed on the same straight line as the generator set and the air exhaust outlet. The air inlet must be equipped with a resistive piece silencer. Since the pressure loss at the air inlet is also within the allowable range, the air volume entering and leaving the engine room can be naturally balanced, and the ventilation and heat dissipation effect is obvious. (3) Acoustic absorption treatmenteu. All five walls of the engine room, except the floor, can be treated with sound absorption. According to the spectral characteristics of the generator set, a perforated plate resonance sound absorption structure is adopted. (4) Indoor air exchange and good sound insulation of the engine room will prevent room air convection when the closed water-cooled generator is stopped, and the high temperature in the room will not be able to be lowered in time. Low noise axial flow fans can be used. Combined with a resistive chip silencer, the problem can be solved. (5) Vibration isolation of the unit. Before the installation of the generator set, vibration isolation treatment should be carried out in strict accordance with the relevant information provided by the manufacturer to avoid long-distance transmission of structural noise and continuous radiation of noise aoverhead during propagation, making it impossible to maintain the noise level at the plant boundaries.
How to reduce generator noise?
In addition to noise-proofing treatment on the walls and top of the computer room itself, it is best to use the computer room door as a porch, which also serves for sound insulation and to noise reduction. . This is equivalent to two soundproof doors, plus a soundproof channel, as a secondary door. To silence the air, make an “impedance composite soundproof cover” at the air inlet and outlet. If the air inlet is in the porch, then realize. two soundproof covers, also called secondary soundproofing, surround the generator exhaust pipe, and connect two silencers in series. It is also a second level silencer. Let me explain how to do it in detail.
The most basic way to reduce generator noise is to removeer the noise from the sound source.Start by using some conventional noise reduction techniques such as silencers, sound insulation, sound absorption, vibration isolation, etc., which are the most effective methods.
1. Reduce exhaust noise. Exhaust noise is the main source of noise from the unit. It is characterized by high noise level, fast exhaust speed and difficult handling. Using a special impedance-type composite silencer can generally reduce exhaust noise by 40-60 dB(a).
2. Reduce noise from axial flow fans. When reducing generator cooling fan noise, two issues need to be considered. One is the allowable pressure loss in the exhaust channel. The second is the required amount of noise reduction. For the two points above, resistive chip silencers are not verywind be used.
3. Sound insulation, sound absorption treatment and vibration insulation of the engine room
(1) Sound insulation of the engine room. After the unit's exhaust noise and cooling fan noise are reduced, the main source of noise remaining is electrical and mechanical noise. The method adopted is to remove all windows except the necessary interior wall observation windows connected to the observation room, all holes and holes must be sealed tightly, and the sound insulation of the brick wall must be greater than 40 dB (a). The doors and windows of the computer room adopt fireproof and soundproof doors and windows.
(2) Air intake and exhaust. After the sound insulation treatment of the computer room, the ventilation and heat dissipation problem in the computer room needs to be solved. The air inletmust be placed on the same straight line as the engine block and the air exhaust outlet. The air inlet must be equipped with a resistive piece silencer. Since the pressure loss at the air inlet is also within the allowable range, the air volume entering and leaving the engine room can be naturally balanced, and the ventilation and heat dissipation effect is obvious.
(3) Sound absorption treatment. All five walls of the engine room, except the floor, can be treated with sound absorption. According to the spectral characteristics of the drive unit, a perforated plate resonance sound absorption structure is used.
(4) Indoor air exchange and good sound insulation of the engine room will prevent the room air from convection when the engine block is stopped, and the high temperature in the room cannot be reduced over time. A faint noise may bere used. An axial flow fan coupled with a resistive chip silencer can solve the problem.
(5) Vibration isolation of the unit. Before installation of the engine block, vibration isolation treatment should be carried out in strict accordance with the relevant information provided by the manufacturer in order to avoid long-distance transmission of structural noise and continuous radiation of airborne noise during propagation, making it impossible to obtain noise levels at the plant boundaries. For existing generator sets that require treatment due to exceeding standards, ground vibration conditions near the unit should be measured. If the vibration is obvious, the generator set should first be subjected to vibration isolation treatment.