Enclosed rotary disc air pulser

An enclosed rotary disc air pulser for controlling the flow of an non-lubricating source of air, comprising:

• a housing having a central portion with an annular wall and first and second opposing end plates, said first end plate having an inlet port and a recess on an inner face of said plate being in communication with said inlet port, said second end plate having a exhaust port and a recess on an inner face of said plate being in communication with said exhaust port, said central portion having a pulse leg port in said annular wall, said inlet and exhaust ports being substantially coaxial;
• an elongate shaft mounted in said housing for axial rotation therein, an end of said shaft protruding through said housing;
• a first disc member having a milled out portion defining a single opening and being fixedly secured to said shaft within said housing adjacent said inlet port;
• a second disc member having a milled out portion defining an opening and being fixedly secured to said shaft within said housing adjacent said exhaust port, said open milled out portions in said first and second disc members being substantially identical in configuration;
• said milled out portions being substantially coextensive with said recesses to improve air flow through said pulser;
• said first and second disc members being located in spaced relationship to each other between said end plates and on opposite sides of said pulse leg port and defining an undivided chamber therebetween, said chamber being in communication with said pulse leg port;
• and
• said disc members being positioned upon said shaft with said milled out portions being diametrically out of phase with each other so that as said shaft rotates, said milled out portions permit cyclical alternating communication of the non-lubricating source of air between said inlet port and said chamber, and said exhaust port and said chamber.