A fluid pump for location within a liquid reservoir.

摘要

A fluid pump for location within a reservoir (10) and which is operable with rise and fall of liquid within the reservoir. The pump comprises a tube (30) of a resiliently deformable material, an abutment surface (35) which is engaged by the tube and a float device (32) which is mounted to the tube (30). Liquid entering the reservoir causes upward movement of the float device (32) and such movement of the float device causes increasing engagement between the tube (30) and the abutment surface (35). The increasing engagement between the tube and the abutment surface causes the tube to deform resiliently and a localised reduction in the contained volume of the tube is thereby effected to cause expulsion of fluid from the tube. Conversely, as the liquid level falls in the reservoir, the float device moves downwardly to reduce the extent of engagement between the tube and the abutment surface, so that the tube tends to resume its initial contained volume.