Piston flow calibrator with internal guide rod

Abstract

The invention discloses a piston flow calibrator with an internal guide rod. A disc piston is disposed in a piston cylinder; the upper and lower ends of the piston cylinder are connected with upper and lower end covers respectively. A ball screw penetrates a central through hole of the disc piston and is nested in a piston rod. A screw nut is fixed to the disc piston. The lower end of the piston rod is hermetically and fixedly connected to the disc piston. The ball screw penetrates the lower end cover and is connected with a motor through a coupling. The guide rod eccentrically penetrates the disc piston; two ends of the guide rod are then connected to the upper end cover and the lower end cover; the guide rod is parallel to the ball screw. The disc piston is provided with a circular groove for accommodating oil, a notch and an eccentric intake through hole. The upper end cover is provided with an upper proximity switch, temperature and pressure sensors and an exhaust port. The lower end cover is provided with a lower proximity switch. The guide rod and the screw are disposed in the piston cylinder, the structure of the calibrator is greatly simplified, the piston rod can be retracted into the piston cylinder under non-experimental conditions, the height of the calibrator is decreased, the structure which is more compact and firmer facilitates carrying, and the calibrator has great advantages for on-site calibration.

Description

technical field [0001] The invention relates to a piston-type flow calibrator, which is a piston-type flow calibrator with a built-in guide rod. Background technique [0002] Piston-type flow standard devices can be divided into disc-type piston devices, bell-type piston devices and barrel-type piston devices according to different piston types, and can be divided into active piston devices and passive piston devices according to different piston driving methods. The existing active piston devices all design the guide mechanism and the transmission mechanism outside the piston cylinder, resulting in a complex structure and a long length. For example, the length of the disc-shaped piston device is about twice the length of the piston cylinder, and the bell-shaped piston device and The length of the cylindrical piston device is about 3 times of the length of the piston cylinder. The structural disadvantages of the existing piston device make it difficult to carry, and the ass...

AI Technical Summary

Problems solved by technology

The existing active piston devices all design the guiding mechanism and the transmission mechanism outside the piston cylinder, resulting in a complex structure and a long length. For example, the length of the disc-shaped piston device is about twice the length of the piston cylinder, and the bell-shaped piston device and The length of the cylindrical piston device is about 3 times the length of the piston cylinder

The structural shortcomings of the existing piston device make it difficult to handle, and it is easy to cause loss of assembly accuracy during transportation, causing adverse effects

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