Precision differential pressure dosing device

Abstract

The invention relates to a precise differential pressure type dosing device and belongs to water treatment dosing equipment. The dosing device mainly aims to solve the technical problems that the dosing concentration of the existing dosing device is not uniform, and the dosing amount can not be changed along with the water flow in proportion. The technical scheme of the dosing device is as follows: the precise differential pressure type dosing device comprises a drug storage tank, a hollow elastic bag body, a throttle valve, a flowmeter, a Venturi jet device, a concentrated drug box, a flow controller, a plurality of control valves, an observation hole and a connecting pipeline, wherein the hollow elastic bag body is arranged in the drug storage tank; the inner cavity of the hollow elastic bag body is a pressure-resistant elastic cavity; an upper connection port of the hollow elastic bag body extends out of the drug storage tank; a drug storage cavity is formed between the outer surface of the hollow elastic bag body and the inner surface of the drug storage tank; the inner cavity of the hollow elastic bag body is connected with a liquid inlet end of the flow controller through the upper connection port; the drug inlet / outlet opening which is arranged in the lower part of the drug storage cavity is connected with the liquid outlet end of the flow controller through the throttle valve and the flowmeter.

Description

technical field [0001] The invention relates to a precision differential pressure type dosing device, which belongs to water treatment dosing equipment and can also be used for other fluid systems that need dosing. Background technique [0002] Water treatment dosing is generally realized by electric metering pumps, and there are many types of electric metering pumps; since the dosing volume is very small, and the displacement of metering pumps cannot be made very small, so most of them are pulse injection methods, and dosing in water Pulse filling, as a result, the concentration of the liquid medicine in the water changes periodically, which is not uniform enough. When the flow of water changes, the dosing amount of the electric metering pump generally does not change with the change of the water flow. It is a given dosing, and the dosing concentration cannot be kept stable. In an explosion-proof environment, the electric metering pump must use an explosion-proof motor, wh...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problems of the existing dosing device that the dosing concentration is not uniform and the dosing amount cannot be changed proportionally with the change of the water flow, and to provide a continuous precision small flow and the dosing amount changes with the water flow rate. Proportional change and non-powered precision differential pressure dosing device

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