Roots flowmeter

Abstract

The invention discloses a roots flowmeter, which includes a casing, as well as two roots assemblies that are subjected to relative rolling rotation, wherein each of the roots assemblies is composed of a roots and a roots shaft; the roots assemblies are supported on rolling bearings, rotate at high speed, and at the same time drive a coaxial transmission gear to rotate; the rolling bearings are fixed on an upper metering plate and a lower metering plate; the transmission gear is meshed with an optionally matched gear of a sealing coupler; external magnetic steel matched with the corresponding part of a stepped through hole of an external magnetic steel base is embedded in the external magnetic steel base; the middle part of an internal magnetic steel base is matched and mounted inside the external magnetic steel and the external magnetic steel base; a rotating shaft is mounted on the internal magnetic steel base through a rotating shaft sleeve; internal magnetic steel is mounted at the lower end part of the rotating shaft; a transmission claw is mounted at the upper end of the rotating shaft; and the transmission claw is connected with a reducing mechanism. The reducing mechanism performs certain digit-ratio conversion and transmits the result to a counter; and the sealing coupler is tightly pressed on the casing by a metal gland, and is sealed by a seal gasket. The roots flowmeter is reasonable in structural design, is convenient to mount and use, is good in fixing stability, is not easy to loose, and avoids loss of the transmission energy.

Description

Technical field [0001] The present invention relates to a flow meter, in particular to a waist wheel flow meter. Background technique [0002] Waist wheel flowmeter is composed of a shell and a pair of two waist-shaped rotors (waist wheels for short) that are rolling and rotating in the shell. When the measured liquid flows through the measuring chamber, a pressure difference is formed at the inlet and outlet of the flowmeter. The wheel rotates driven by this pressure difference. At the same time, a pair of driving gears fixed on the waist wheel shaft keep the two waist wheels continuously rotating. With the rotation of the waist wheel, the liquid is continuously discharged from the metering chamber through the metering chamber. The amount of liquid flowing through each rotation of the waist wheel is four times the volume of the measuring chamber. The number of rotations of the waist wheel is transmitted to the counter through the sealed coupling and the deceleration mechanism....

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to make up for the deficiencies of the prior art, and to provide a waist wheel flowmeter, which adopts inner and outer magnetic steel structure magnetic transmission, completely replaces the mechanical seal form, and at the same time solves the problem of complicated mechanical seal couplings and installation problems. Inconvenient to use, poor fixing stability, easy to loose, resulting in the loss of transmission energy and other problems

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