EXHAUST PART OF THE VACUUM DEVICE WITH REDUCED NOISE LEVEL

The invention deals with the exhaust part of the centrifugal vacuum device, which in vacuum cleaners, particularly the ones for dust, generate a negative suction pressure and remove air. The construction according to the invention with resonance coating reduces the overall noise level of the vacuum cleaner and in particular eliminates the occurrence of whistling sound of discrete frequencies, which are very annoying to the human ear. According to the invention there are volume (Helmholtz) resonators applied to the surface of the exhaust part, which are made in the form of coatings (8, 9, 10) with recesses and are located as a coating (9) on the circumference of the cover (4) and/or as a coating (10) on the rear part of the diffuser (3) and/or as a coating (8) on the front side of the cover (4). The coatings (8, 9, 10) are 3 to 12 mm thick so that the volumes of the resonators are between 8 to 200 m3, the resonator inlet openings measure between 0,3 to 0,12 m2 and the neck lengths of the inlet openings are between 0,3 to 2,5 mm. Izum se nanaša na izstopni del centrifugalne sesalne enote, ki v sesalnikih, predvsem v sesalnikih prahu, generirajo sesalni podtlak in odsesavajo zrak. Konstrukcija po izumu z resonatorsko oblogo zmanjšuje hrupnost celega sesalnika in še posebej odpravlja pisk diskretnih frekvenc, ki je za človeško uho zelo moteč. Po izumu so na površine izstopnega dela sesalne enote nameščeni volumski (Helmholzerjevi) resonatorji, ki so izdelani kot obloge (8, 9, 10) z vdolbinami in so nameščeni kot obloga (9) na obodu pokrova (4) in/ali kot obloga (10) na hrbtnem delu difuzorja (3) in/ali kot obloga (8) na prednji strani pokrova (4). Obloge (8, 9, 10) so debeline od 3 do 12 mm, da so volumni resonatorjev od 8 do 200 mm3, da so vhodne odprtine resonatorjev od 0.3 do 12 mm2 in dolžine vratu vhodnih odprtin dolžine od 0.3 do 2.5 mm.