The LFX-A type splitter rotor steam flowmeter (hereinafter referred to as the flowmeter) is a mechanical pointer instrument mainly used to measure the flow rate of saturated steam and superheated steam with relatively low superheat in industrial production processes. This flowmeter has a simple structure, is stable and reliable, has low pressure loss, and is directly installed on the measured steam pipeline to measure the cumulative mass (weight) of steam. This flowmeter is an innovative product of the prototype steam flowmeter. Due to the use of a new structure of planetary transmission to adjust the pressure compensation scale, the scale interval of the pressure compensation dial is widened, which enables the compensation of trace pressure changes and ensures the measurement accuracy of the flowmeter. Due to the use of counters and single needle measurement, the display method simplifies the structure of the header and makes the measurement display more prominent. Due to the relocation of the deceleration mechanism outside the damping chamber, the failure rate has been reduced.

The flow meter is designed and manufactured based on the principle of throttling element and diversion; After the measured steam enters the flowmeter body, it is divided into two paths, one path Q₁By throttling the orifice plate (this part of the steam is not measured), a pressure difference △ P is generated on both sides of the orifice plate. Under this pressure difference, another Q path is formed₂Spray onto the impeller through the nozzle, and the impeller shaft rotates. To slow down the speed of the impeller shaft, damping blades are placed below the impeller shaft and immersed in water inside the damping chamber. Due to the same pressure difference △ P between the two channels, within the specified flow range, according to the principle of fluid similarity, the steam flow rate Q of the two channels₁And Q₂The proportional relationship between them is basically constant, so as long as the flow rate Q flowing through the nozzle is measured₂You can know the total traffic Q.