Pneumatic metering pump and its measuring method

Abstract

The invention discloses a pneumatic metering pump, comprising a pump body, a metering chamber and a detection chamber are arranged inside the pump body, the upper end of the metering chamber is provided with an air inlet and outlet, and the lower end liquid inlet and the liquid outlet are respectively provided with liquid inlets One-way valve and one-way valve for liquid outlet, a liquid level float is arranged inside the metering chamber, and a magnetic steel is arranged inside the liquid level float near the detection chamber; the detection chamber is installed with a stepper motor, and the output of the stepper motor The shaft is connected with a screw rod that can rotate synchronously with the output shaft. One side of the screw rod is fixed with a guide rod arranged in parallel with it. One side is slidably sleeved on the guide rod, and a detection plate is installed on the side of the slider close to the magnetic steel in the metering chamber, and the detection plate is provided with a magnetic sensor. The pneumatic metering pump of the invention has high measurement accuracy, compact structure design, stable performance, and can work reliably for a long time.

Description

technical field [0001] The invention belongs to the technical field of metering pumps, in particular to a pneumatic metering pump and a measuring method thereof. Background technique [0002] Metering pumps are commonly used machinery for fluid transfer, and are characterized by the ability to maintain a constant flow regardless of discharge pressure. Due to its own outstanding characteristics, metering pumps have been widely used in petrochemical, pharmaceutical, food and other industrial fields. [0003] The existing metering pumps with high accuracy mainly include: plunger type, diaphragm type, etc. Among them, the plunger type metering pump will cause wear and affect normal operation due to the reciprocating relative movement between the plunger and the cavity; Diaphragm metering pumps also cause changes in metering accuracy due to changes in the viscosity of the liquid being metered. SUMMARY OF THE INVENTION [0004] The purpose of the present invention is to solve ...

AI Technical Summary

Problems solved by technology

[0003] The existing high-precision metering pumps mainly include: plunger type, diaphragm type, etc. Among them, the plunger type metering pump will cause wear and affect normal work due to the reciprocating relative motion between the plunger and the cavity; Diaphragm metering pumps will also cause changes in metering accuracy due to changes in the viscosity of the metered liquid

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