POSITIVE DISPLACEMENT FLOWMETER

摘要

A positive displacement flowmeter comprising a flowmeter portion including a pair of rotors rotatable in proportion to a fluid's flow in a measuring chamber and a counting portion for measuring a total flow by counting the rotor's rotations. It has many improvements. Firstly, the flowmeter is protected against the penetration of rain water into its counting portion. Furthermore, the counting portion housing is so constructed as to assure the easy mounting of an electric circuit and like components therein and also the possibility to control said circuit from the outside of the housing by use of reed switches and the like. The flowmeter is improved not to transfer heat of a fluid of high temperature to the counting portion and, furthermore, to assure the easy mounting of rotors in the measuring chamber. Particularly, it is possible to provide high performance rotors mounted in the measuring chamber by using non-circular gears having a special tooth profile and made of special materials. Other various improvements are presented.