Aspirator and aspirating system

• Main Author: THOMPSON; LINCOLN
• Format: Patent
• Language: English
• Published: 02.08.1983
• Subjects: BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BYUSING INERTIA OF FLUID TO BE PUMPED; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; SIPHONS; WEAPONS

In an aspirator having convergent and divergent passage sections interconnected by an intermediate passage, the intermediate passage is characterized by an upstream portion having a constant first diameter, a downstream portion having a constant second diameter which is greater than the first diameter and an annular chamber at the junction of the upstream and downstream passage portions. The annular chamber has a diameter greater than that of the downstream portion and is coupled via a further passageway to a source of fluid to be aspirated. The aspirator may include a suction control in the form of a passage having at least a first valve therein for interconnecting the convergent and divergent passage portions and/or either the convergent or divergent passage portion to the annular chamber. The aspirator may also be provided with a pressure responsive valve positioned upstream of the convergent passage portion, the valve being responsive to pressure downstream of the aspirator for automatically controlling the rate of flow of fluid to the aspirator.