Snail design and optimization for noise improvement in hoods

Hoods or extractor hoods are devices used in kitchens to absorb and evacuate the air from cooking sources or to clean the air. These devices aim to make the ambient air cleaner by absorbing the steam, smoke, oil mist, odors and other centers formed in the kitchen. It is important for these devices to have high traction, to effectively absorb the air in the environment and to provide the exhaust pipe of the air. However, due to the high suction power increase, the noise level also consists of the array. Therefore, the snail design must be optimized to provide low sound insulation as well as high performance. The snail design is a factor that has a significant impact on the performance and noise level of a hood or extractor hood. The snail is an influence that directs the air assessment while breathing inside the device and by absorbing the air in the environment. Review the noise level by arranging the air tank with the design change. An optimized design can better respond to users' expectations by providing lower sound levels with high traction. One of the parameters affecting the noise level in radial snails is the curved tongue structure. The curved tongue parameter is a convoluted structure in the internal structure of the snail that regulates the air flow. This parameter is important for directing the air flow and creating pressure. In the study, the effect of 7 different curved tongues on the flow rate and noise level, starting from 1 mm diameter and increasing 2 mm up to 13 mm diameter, keeping the distance between the curved tongue and the propeller the same. In order to carry out the experimental study, the tongue part of the radial snail was cut and emptied. The parts removed from the 3D printer were mounted on this snail in a way that would not disrupt the air flow, and 7 different test samples were obtained. Different layered filters are used to increase oil retention in the hood and aspirator. As the number of layers increases, the oil retention of the filter increases. Tests were carried out using 3-layer and 5-layer oil filters for 7 different samples. When the test results obtained are examined, it is seen that the highest traction power and the lowest noise level occur in the use of both filters in the folded tongue structure with a diameter of 9 mm. For the 3-layer oil filter, changing the tongue diameter from 1 mm to 9 mm resulted in an increase in traction of about 15 m3 and a noise level reduction of 1.5 dB. For the 5-layer oil filter, changing the tongue diameter from 1 mm to 9 mm resulted in an increase in traction of approximately 18 m3 and a noise level reduction of 1.9 dB. With the design change, both an increase in the flow level and a decrease in the noise level were achieved by providing radial volute optimization.