Engineering Introduction:            

With the change of life concept, people are more seeking to improve the quality of life. The demand for air conditioning is not only the adjustment of indoor temperature. Consumers will also pay attention to the factors of air conditioning noise, refrigeration and electricity consumption during the purchase of air conditioning. Meanwhile, the state has also issued relevant policies to standardize the production and production of air conditioning manufacturers. Quality of the product. The main source of noise in air conditioning unit is fan noise and compressor noise, and air conditioning operation is carried out through the principle of aerodynamics, so aerodynamic noise is the main source of noise and is mainly at middle and low frequency.         

Compressor noise is usually composed of aerodynamic noise, mechanical noise, electromagnetic noise and exhaust noise. The frequency spectrum characteristics mainly focus on low frequency parts below 250Hz, and gradually reduce from low frequency to high frequency, showing low frequency, wide frequency band and high total sound level.   

Solution:

1、at the stage of design and construction, we should pay attention to the control of the source of noise.            

The noise source of the air conditioning room should be ventilator, refrigerator and water pump. The noise quantity should be considered when selecting the equipment, so as to avoid interference to the surrounding environment.            

2、design requirements for the design of different noise source equipment.            

When the vibration and noise of the refrigerator room is large, it is usually installed in the basement. It is necessary to consider the height and load bearing of the refrigerator room. At the same time, it is necessary to leave enough space for the shock absorption and sound insulation equipment used in the later period.            

The walls, floors, doors and windows, wall pipes and so on of the refrigeration machine room need to be comprehensively managed, so as to realize sound insulation and shock absorption to the greatest extent.          

3、points of attention in the stage of design and selection and construction stage:        

The combination pumps of the refrigerator should select high efficiency, low noise, low energy consumption and environmental protection. In the design stage, the hydraulic and resistance of the pipe network must be accurately calculated.            

Because most of the air conditioning and refrigeration facilities are located in the building, in order to get more effective vibration reduction methods, it is recommended to adopt the steel platform + spring damper.            

Regarding the sound insulation of the pump, the frequency ratio of the vibration isolation system and the speed of the pump should be more than 3. The common practice is to use the vibration damping platform. The weight of the platform should be 1.5-2.5 times of the weight of the pump.            

The connector should be connected with a rubber flexible joint to reduce the solid sound generated during vibration.            

The pipe supports and hangers should be placed as far as possible, or the hangers should adopt spring damping hangers.            

4.how to conduct noise insulation and noise reduction for the completed air conditioning units?

because there are many kinds of noise in the air conditioner outdoor unit, it is necessary to take comprehensive measures to reduce noise. The best measures to eliminate the noise of the fan and compressor at the same time are the sound insulation cover or sound insulation barrier.

Air-conditioning unit should consider the requirements of ventilation and heat dissipation, so the sound insulation cover can not be closed, so the sound insulation cover needs two parts, sound insulation and noise elimination. The sound barrier can use a half encircled sound barrier. The height and structure of the sound barrier should be set according to the amount of noise reduction; sound elimination can be used with sound absorption board and sound absorption. Blankets and other materials are wrapped around the equipment to achieve sound insulation and noise reduction.