Dust collector

Claim 1

A dust collecting device comprising: a closed tank which is closed at its top by a lid, said tank containing water and having an outlet pipe means in its side above the water level for establishing a vacuum in said tank and withdrawing purified air therefrom; cylinder means for receiving dusty air having an open lower end and an upper closed end and slidably inserted in said lid so that its open end is in substantial intercommunicating relationship with the water level in said closed tank; tray means attached to the lower portion of said cylinder means inside said closed tank and inverted so that its trayed face faces said water level; base plate means adjustably attached to said tray means, said base plate means having an upper and lower surface and provided with a bowl at its center, said bowl having an upper open portion and holes disposed in the sides thereof, said bowl being in communication with said water through said holes, said base plate means being arranged in spaced relationship with said tray means so that said trayed face faces both the opening of said bowl and the upper surface of said base plate means, and the open end of the lower portion of said cylinder means is disposed in said bowl; and wherein said trayed face of said tray means has an area smaller than the area defined by said upper surface Of said base plate means; annular float means having said base plate means mounted thereon, said annular float causing said base plate means with said bowl to float substantially at the water level in said closed tank so that said open end of said cylinder means retains its disposition with respect to the water level during movements of said water level; inlet pipe means for feeding dusty air to said cylinder means and having an inlet end portion which is inserted through the base of said bowl and disposed within said cylinder means so as to define an annular space between the outer surface of said inlet pipe means and the inner surface of said cylinder means, whereby dusty air received in said cylinder means during operation of said dust collector flows through said annular space into said bowl and causes water particles to rebound between said tray means and said base plate means and thereby generates a dust collecting action in said dust collecting device.