Liquid-ring pump having additional openings in control disc for warm and cold liquid

Claim 1

A liquid-ring pump comprising: (a) a housing, (b) a vane wheel having a hub and a shaft extending out on both sides of the hub, the vane wheel arranged eccentrically within the housing and adapted to revolve in engagement with a ring of rotating liquid, (c) end bells supporting the shaft of the vane wheel for rotation, the end bells being arranged on opposite sides of the housing, a first end bell having separate chambers for warm and cold portions of operating liquid, (d) said first end bell having a first inlet for feeding in cold liquid to the chamber of said first end bell for the cold portion of operating liquid and a second inlet for feeding in warm liquid to the chamber of said first end bell for the warm portion of operating liquid, and (e) a control disc sealingly disposed between the first end bell and the housing and provided with suction and pressure slots, first and second openings for the separate communication with the separate chambers for the warm and cold portions of operating liquid, a first slot covered by the vane wheel hub and disposed concentrically between the shaft and the suction slot, the first opening for communication with the chamber of the end bell for the cold portion of operating liquid opening into the first slot, and a second slot covered by the vane wheel hub and disposed concentrically between the shaft and the pressure slot, the second opening for communication with the chamber of the end bell for the warm portion of operating liquid opening into the second slot, the first and second slots being spatially separated from one another.