Digital quantitative continuous injection pump

Abstract

The digital quantitative continuous injection pump includes a power source, a transmission system, an actuator, and a control system. The power source outputs rotary motion, and the transmission system changes the speed of the rotary motion output by the power source, and then converts it into linear motion, and then drives the actuator The liquid in the container is sucked into the device, and then discharged from the liquid outlet. The control system is used to control the entire device, realize stepless speed change by controlling the pulse frequency, realize quantitative liquid injection by controlling the number of pulses, and improve the liquid injection accuracy by introducing flow feedback , Overload protection is achieved by introducing a pressure switch. By adjusting the speed of the stepping motor to control the flow speed of the fluid, the working pressure of the system is above the air separation pressure and saturated vapor pressure of the liquid, preventing cavitation, and greatly improving the stability of the system and the use of the device. life.

Description

Technical field: [0001] The invention relates to a technique for realizing continuous and quantitative liquid injection by using mechanical-electronic-hydraulic control means, and belongs to the field of liquid injection, sample feeding and cleaning instruments. Background technique: [0002] In the fields of chemical industry, mining, metallurgy, papermaking, food, medical equipment, petroleum, water treatment, pharmaceuticals, etc., it is often necessary to use solution transfer instruments such as liquid injection, sample injection, and cleaning. During the working process of such instruments, cavitation often occurs. [0003] The cavitation phenomenon can be explained as: inside the flowing liquid, if the pressure of the fluid varies widely, the bubbles will be precipitated in the low-pressure area of ​​the fluid, and then compressed in the high-pressure area. When the compression reaches a certain level, the bubbles will burst and produce up to 150MPA -200MPA instantan...

AI Technical Summary

Problems solved by technology

Although the digital syringe pump has high injection accuracy, it can only complete short-term continuous injection. If it is necessary to inject liquid for a long time, it must be injected multiple times. for injection only

Although the peristaltic pump can complete long-term continuous injection, the flow rate of the peristaltic pump is slow and the efficiency is low, so it is not a constant flow pump

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