How to solve the noise of commercial kitchen range hoods with electrostatic precipitators?

In catering kitchens, commercial kitchen range hoods with electrostatic precipitators are the core equipment to ensure the purification and emission of oil fumes, but the excessive noise during operation has become a "headache" for many businesses. The harsh roar not only affects the normal work and communication of chefs, but may also cause complaints from surrounding residents. In fact, scientific methods can effectively reduce noise. The following 5 practical test techniques can help you easily solve the noise problem of commercial kitchen range hoods with electrostatic precipitators.

1. Optimize fan shock absorption measures

1. Root cause of the problem

When the fan of a commercial kitchen range hood with an electrostatic precipitator is running at high speed, it will produce strong vibrations. If the shock absorption measures are not in place, the vibration will be transmitted to the equipment casing and pipes, which will amplify the noise. Because the fan of a hot pot restaurant is directly fixed on the bracket and no shock absorption device is installed, the noise during operation is as high as 80 decibels, which seriously affects the dining experience.

2. Noise reduction techniques

Install shock-absorbing pads: Install rubber or spring shock-absorbing pads between the fan and the bracket to effectively buffer the vibration. Choose a shock-absorbing pad with a thickness of 2-3 cm and moderate hardness, evenly distributed at the bottom of the fan, which can reduce vibration noise by 20%-30%.

Use shock-absorbing hooks: For fans installed in a suspended manner, use shock-absorbing hooks instead of ordinary hooks. The hooks have built-in shock-absorbing springs and damping materials to reduce the vertical vibration transmission during the operation of the fan. The actual measurement can reduce the noise by 15-20 decibels.

2. Cleaning and maintaining the impeller

1. Root cause of the problem

The fan impeller absorbs oil smoke for a long time, which will cause oil accumulation on the surface, uneven weight, unbalanced vibration during operation, and cause noise. Because a barbecue restaurant did not clean the impeller regularly, the equipment made a "buzzing" sound when it was running, and the noise value was 15 decibels higher than normal.

2. Noise reduction tips

Regular deep cleaning: remove the impeller every 1-2 months, soak it in a special degreaser for 30 minutes, gently scrub the surface oil with a soft brush, rinse and dry it before installing it, which can restore the impeller balance and reduce noise.

Check impeller wear: Check whether the impeller is deformed or worn during cleaning. If the edge of the blade is damaged, replace it with a new impeller in time to avoid aggravating the noise due to impeller failure.

3. Improve the design and layout of the air duct

1. Root cause of the problem

Irrational air duct design, such as too narrow pipes and too many bends, will lead to poor air flow and form vortex noise. There are multiple 90-degree right-angle bends in the exhaust duct of a Chinese restaurant, with large wind resistance, and a sharp whistling sound when the equipment is running.

2. Noise reduction tips

Optimize the pipe angle: Change the 90-degree right-angle bend to a 45-degree bevel bend to reduce air flow resistance and reduce vortex noise. Actual measurements show that the noise of the air duct can be reduced by 10-15 decibels after the transformation.

Increase the diameter of the pipe: If space permits, appropriately increase the diameter of the exhaust pipe to make the airflow smoother. For example, upgrading a 20 cm diameter pipe to 25 cm can effectively reduce the friction noise of the airflow.

4.Seal equipment gaps and holes

1. Source of the problem

The gaps and holes in the outer shell and pipe interface of a commercial kitchen range hood with an electrostatic precipitator will allow noise to leak out, and airflow leakage will also generate additional noise. A fast food restaurant had a poorly sealed pipe interface, and the noise of air leakage during operation was obvious, affecting customers' dining.

2. Noise reduction tips

Use sealing strips: Paste high-temperature resistant sealing strips at the joints of the equipment shell and the pipe interface to form a closed space to block the propagation of noise. High-temperature resistant silicone strips can withstand temperatures above 200°C, and the sealing effect is long-lasting.

Fill holes: Use fireproof sealing mud to seal idle holes on the equipment, such as gaps when the inspection port is not in use, which can reduce noise and prevent oil smoke leakage.

5. Upgrade silent parts and materials

1. Root of the problem

Some commercial kitchen range hoods with electrostatic precipitators use ordinary motors and fan blades with poor materials, which make a lot of noise when running. The wear of the parts of old equipment will also increase the noise.

2. Noise reduction tips

Replace silent motors: Upgrade ordinary motors to low-noise variable-frequency motors. Variable-frequency motors can automatically adjust the speed according to the amount of oil smoke, while ensuring the exhaust effect and reducing the operating noise. Actual measurements show that the noise can be reduced by 20-25 decibels after replacement.

Use silencer materials: Silencer cotton is pasted on the inside of the hood and the surface of the pipe. The porous structure of the silencer cotton can absorb noise. The centrifugal glass wool silencer with a density of 32kg/m³ is selected, which has a significant noise reduction effect and is fireproof and moisture-proof.

Through the above 5 tips, starting from shock absorption, maintenance, design, sealing to component upgrades, the noise of commercial kitchen range hoods with electrostatic precipitators can be effectively reduced. In actual operation, these methods can be combined according to the specific situation of the equipment to create a quiet and comfortable kitchen environment to avoid noise problems affecting business and reputation. If the noise problem is still not improved, it is recommended to contact professionals for a comprehensive inspection of the equipment.