Solutions to elevator noise

When users encounter problems related to elevator noise, they can first ask relevant testing institutions with national qualifications to carry out systematic and scientific testing on elevator noise. After obtaining the legally binding test report, if they find that the elevator noise does exceed the standard, they can complain to the property management company or the local department specializing in noise pollution (such as the Ministry of Environmental Protection), and the environmental protection department will deal with the excessive elevator noise according to the national environmental protection standards and relevant laws.

Many people often simply understand elevator noise control as ordinary indoor sound absorption control or wall sound insulation control. Therefore, although the elevator noise has been treated many times, the effect is not ideal. Over time, people mistakenly thought that elevator noise could not be controlled. Moreover, because the noise standard in the elevator machine room itself conforms to the relevant national acceptance standards for elevators, under the current fierce price competition, elevator manufacturers are unlikely to invest too much energy and cost in-depth research, which has become a technical problem in China. In fact, noise control can start from the following aspects:

1, noise insulation of machine room

Including the construction of computer room, vibration and sound insulation measures of computer room, sound absorption treatment of computer room, etc. , in order to reduce the vibration and noise of the computer room.

2, elevator shaft sound insulation

Including the sound absorption treatment of elevator shaft inner wall, elevator ventilation design, elevator track noise reduction treatment and so on. Reduce the occurrence of noise through the operation of elevators.

3. Sound insulation of elevator doors

Pay attention to the installation of elevator doors and the lubrication of guide rails.

4, building sound insulation design

Developers should consider the problem of noise when designing building structures, keep users' public space away from elevator shafts in design, and take measures to reduce the vibration and noise between users' rooms and elevator shafts. Select the elevator type according to the actual use.

5, the layout of the house bedroom

If the room is adjacent to the elevator, pay more attention to the layout of the indoor room and try to avoid the situation that the bedroom is separated from the elevator shaft by a wall. Elevator noise pollution is different from general noise, belonging to low-frequency noise pollution, accompanied by slight vibration pollution. The main mode of transmission is solid sound, while the general noise takes air as the sound transmission medium. Reinforced concrete slab is a kind of high-density material, and low-frequency sound propagates fast and has low attenuation in tunnel. In view of the above characteristics, the following control measures are taken.

1. The foundation of the original elevator main engine and distribution cabinet is rigidly connected with the reinforced concrete of the building, which becomes the "sound bridge" for the main transmission of elevator noise. The original foundation is transformed into a composite broadband K value (neck coefficient) vibration and noise reduction foundation to isolate the propagation path of low-frequency noise.

2. The electromagnetic radiation noise of the distribution cabinet is also one of the strong pollution sources, and the foundation of the distribution cabinet adopts the composite foundation with the lowest excitation frequency of 1HZ; The soft contact between the incoming and outgoing lines disconnects the rigid connection between the building and the floor, forming an "acoustic bridge" and cutting off the electromagnetic low-frequency noise from the root.

3. If there is a noise problem caused by the friction between the car and the counterweight main guide rail transmitted to the hoistway structure, the elevator guide rail vibration and noise reduction device is used to reduce the structural sound transmission of this kind of hoistway.

Based on the analysis of the mechanism of elevator noise and vibration, the difficulty of reconstruction and the convenience of maintenance, a set of economical and effective damping spring compound damping device and a unique low-frequency sound insulation and noise reduction combination-elevator shock absorber are adopted to ensure the elimination of background noise after treatment. After the renovation, the environment of room acoustics residents met the latest national standards, and passed the annual inspection of local special equipment inspection and maintenance departments. Residents can apply for "pollution" assessment and identification at the Environmental Institute of China CDC. After receiving the report, you can negotiate with the real estate developer or property company to solve it. In addition to complaints, the use of the law can also protect the interests of residents. From nearly 600 successful cases of elevator low-frequency noise control in domestic leading enterprises, it can be seen that the most fundamental, scientific and sustainable solution is to fundamentally solve the problem of elevator low-frequency vibration and noise pollution, and consider targeted vibration reduction and isolation of elevator sound source and elevator low-frequency vibration and noise from architectural design. (A) R&D background

With the acceleration of urbanization in China, there are more and more high-rise buildings in cities, and elevators are the necessary equipment for high-rise buildings.

The vibration and noise generated during the operation of the elevator will be transmitted to the surrounding rooms through the walls and floors of the building in the form of solid sound transmission. The resulting low-frequency noise is extremely harmful to people's health. Especially for people who work and live indoors polluted by low-frequency noise for a long time, the damage to their hearing, cardiovascular system and nervous system is more obvious.

At present, elevator mute fundamentally solves the problem of vibration and low-frequency noise pollution during elevator operation, which is a patented product promoted by the state for environmental protection.

(II) Performance introduction

The traditional elevator vibration reduction method is passive vibration reduction with multiple single-spring dampers or rubber pads, which has the disadvantages of single vibration reduction frequency and less vibration reduction freedom. However, the vibration of elevator is broadband and multi-degree-of-freedom, and the traditional vibration reduction method is not ideal, which usually leads to the interference of low-frequency noise around the elevator machine room. Compared with the traditional vibration reduction method, elevator mute is a revolution to the traditional vibration reduction method.

Features are as follows:

1. damping frequency band: 1Hz~80 Hz.

2. High vibration reduction efficiency: the vibration reduction rate is more than 78%.

3. Load capacity: it can bear the weight of 20 tons at most.

4. High sound attenuation: it can completely isolate the broadband noise propagation generated by the traction machine.

5. For the high-speed elevator whose elevator speed is over 2m/s, the noise in the car can be reduced by 2-3dB (a).

6. The lifting height of the special silent traction machine for elevator is about 10cm.

7. Long service life: Because the elevator is silent and has no moving parts, its service life is the same as that of the elevator.

8. The architectural design is convenient and saves the investment cost: As the elevator has become an environment-friendly elevator without vibration and noise pollution, the position of the elevator machine room in the architectural design is more flexible.

(3) Use and maintenance

1. Put the elevator traction machine directly on the vibration and noise reducer and fix it with four bolts with dampers.

2. The elevators in use need the cooperation of elevator maintenance personnel, and each elevator can be installed within 8~ 12 working hours. And you can also choose to install the elevator at night when the utilization rate is low.