Dual Chamber Piston Flow Calibrator

Abstract

The invention relates to a double-cavity piston type flow calibrator. The double-cavity piston type flow calibrator comprises a piston cylinder with a double-rod mechanism, wherein a piston divides the piston cylinder into two cavities, one piston rod is driven to perform linear motion by a motor, each cavity is provided with a temperature transmitter, a pressure transmitter and a proximity switch and meanwhile provided with an air inlet and a working port, and a flow meter to be calibrated is installed in a valve array between two working ports. The double-cavity piston type flow calibrator uses the inner wall of the piston cylinder as the volume standard, the left and right cavities serve as metering cavities, the piston can be used for metering through forward or retreating movement, and the flow meter efficiency is twice of a common piston flow calibrator through valve array switching. Two sides of the piston are communicated, large pressure different does not exist, flow metering under the high-pressure condition can be achieved, and load of a driving mechanism can be also decreased. The double-cavity piston type flow calibrator can form totally-closed fluid circulation and achieve poisonous or special gas flow calibration.

Description

technical field [0001] The invention relates to a flow metering device, in particular to a double-chamber piston flow calibrator. Background technique [0002] Flow measurement is a branch of thermal metrology and an important part of measurement science. Its applications are widely used in various fields such as people's livelihood measurement, energy measurement, environmental protection measurement, and trade measurement. In recent years, piston flow metering devices have been widely used due to their advantages of high precision, high efficiency and high automation. [0003] Ordinary piston-type flow metering devices use a piston cylinder or plunger as a standard, and the one-way movement of the piston or plunger is used as the metering stroke, and the reverse movement is used as the zero-return stroke. The speed of the zero return process is limited by the driving equipment and also by the device’s requirements for fluid stability. It cannot and should not be too fast....

AI Technical Summary

Problems solved by technology

The speed of the zero return process is limited by the driving equipment and also by the device’s requirements for fluid stability. It cannot and should not be too fast. Therefore, each metering stroke is accompanied by a long time return to zero process, which affects the piston flow. The efficiency of the metering device; the fluid of the existing piston flow metering device is an open circuit, and the flow metering of toxic gases or special gases cannot be performed

Images