Device for air cleaning

Device (1;

• 1′;
• 1″;
• 1′″;
• 1″″;
• 1′″″) for air cleaning, said device (1;
• 1′;
• 1″;
• 1′″;
• 1″″;
• 1′″″) including an air flow channel (2;
• 2′;
• 2″;
• 2′″;
• 2″″;
• 2′″″;), an air transporting mechanical fan (3;
• 3′;
• 3″;
• 3′″;
• 3″″;
• 3′″″), a precipitator (4;
• 4′;
• 4″;
• 4′″;
• 4″″;
• 4′″″), a high voltage source (5;
• 5′;
• 5″;
• 5′″;
• 5″″;
• 5′″″), said precipitator (4;
• 4′;
• 4″;
• 4′″;
• 4″″;
• 4′″″) including two band-shaped electrode elements that are wound several times around an axis or bobbin body (7;
• 7′;
• 7″;
• 7′″;
• 7″″;
• 7′″″), a gap distance being present between adjacent electrode elements, the respective electrode elements being electrically connected with each terminal of the high voltage source (5;
• 5′;
• 5″;
• 5′″;
• 5″″;
• 5′″″), and the precipitator (4;
• 4′;
• 4″;
• 4′″;
• 4″″;
• 4′″″) is arranged downstream from the fan (3;
• 3′;
• 3″;
• 3′″;
• 3″″;
• 3′″″), characterized in that the axial distance (a), seen in the air flow direction, between the fan (3;
• 3′;
• 3″;
• 3′″;
• 3″″;
• 3′″″) and the precipitator (4;
• 4′;
• 4″;
• 4′″;
• 4″″;
• 4′″″) is less than 4R, where R is equal to the radius of the air flow channel (2;
• 2′;
• 2″;
• 2′″;
• 2″″;
• 2′″″) or the smallest radial distance from the centre of the precipitator (4;
• 4′;
• 4″;
• 4′″;
• 4″″;
• 4′″″) to the envelope source of the air flow channel (2;
• 2′;
• 2″;
• 2′″;
• 2″″;
• 2′″″), said radius or said smallest radial distance being measured in connection with the precipitator (4;
• 4′;
• 4″;
• 4′″;
• 4″″;
• 4′″″).