Patent ID: 8974205
Filing Date: 2015-03-10
Classification: F04C

Abstract:
1. A progressing cavity gas pump comprising: a stator which has a stator interior with an elastomeric inner surface, a gas outlet and a gas inlet, whereby from the gas inlet to the gas outlet, a pump delivery direction is defined, a rotor which engages with the stator interior, and a lubricant reservoir arranged below the stator which is connected via lubricant conduit devices to the stator interior, wherein due to the arrangement of the lubricant reservoir below the stator, at or downstream of the outlet of the stator interior, a gravitational separation of lubricant and gas takes place, wherein the lubricant conduit devices comprise a lubricant feed line from the lubricant reservoir to the stator interior and a lubricant return line from the stator interior to the lubricant reservoir, wherein an anterior pump chamber is provided which, with respect to the pump delivery direction, is connected on an inlet side to the stator interior, and that the gas inlet opens out into the anterior pump chamber, wherein a rotor drive shaft extends through the anterior pump chamber upstream of the gas inlet and connects to the rotor; wherein the lubricant feed line opens out into the anterior pump chamber, wherein the opening of the lubricant feed line into the anterior pump chamber lies upstream of the opening of the gas inlet and lubricating the entire length of the rotor drive shaft within the anterior pump chamber ensuring that no region through which gas flows is without lubrication, wherein in the pump delivery direction, a distributor having a gas branch-off extending to the gas outlet and a lubricant branch-off extending to the lubricant return line is connected to the gas outlet of the stator interior so that due to gravity, lubricant reaches the lubricant return line and gets into the lubricant reservoir.