Fluid pump apparatus

A compressor having a central cavity having walls, a fluid inlet means including an inlet cap and a fluid outlet means including an outlet cap coupled to the cavity, at least a pair of intermeshing impellers each having a hollow interior positioned in the cavity between the fluid inlet means and the fluid outlet means,

• each impeller having a fluid inlet on at least one end coupled to the fluid inlet means of the cavity and to the hollow interior of each impeller,
• each impeller further having a plurality of external means, having pockets therebetween,
• each impeller further having a plurality of openings between said external means connecting the interior of each impeller with said pockets,
• means coupled to at least one of said impellers for rotating the impellers to draw fluid through the fluid inlet means to the cavity and into the hollow interior of the impellers and through the openings between substantially all of said external means into the pockets between the external means,
• said external means on each impeller adapted to intermesh with the external means on the other impeller for compressing the fluid introduced into the pockets between the external means and the walls of the cavity and force the compressed fluid out of the pockets through the fluid outlet means, and
• a gate fixedly positioned in the hollow interior of each impeller and positioned only immediately adjacent the fluid outlet means where the impellers intermesh and arranged to close only those selected ones of said openings in each of said impellers immediately adjacent said fluid outlet means as said impellers are rotated in said cavity and around said gate to prevent the compressed fluid from passing back into the interiors of the impellers.