A method for conventional metering pumps to realize small flow and high-precision metering and filling

Abstract

The invention discloses a method for realizing small-flow high-precision metering and filling of a conventional metering pump. According to the method, a control device for realizing small-flow high-precision metering and filling is included, the control device comprises a Y-shaped filter, a safety valve, a buffer with a pressure gauge, a bypass ball valve, an isolation ball valve, a flow meter, asmall flow regulating valve, a check valve, a throttling valve and a control cabinet, under the general force support of the flow meter, the small flow regulating valve, the buffer with the pressuregauge, the control cabinet and other accessories, a conventional metering pump can achieve the control precision of 10% or below, the accumulative errors are reduced, the purpose of accurate meteringis achieved, the control device has the characteristics of being reliable in structure, high in efficiency and low in cost, the filling precision of a fluid material at the flow rate of 10% or below is ensured, and the reinvestment is saved.

Description

technical field [0001] The invention belongs to the technical field of metering equipment control, and in particular relates to a method for realizing small-flow and high-precision metering and filling by a conventional metering pump. Background technique [0002] Metering pump is a special positive displacement pump used to transport liquids, especially corrosive liquids. It is widely used in fine filling in petroleum, chemical, water treatment, food, pharmaceutical, environmental protection, medical equipment and other industries. [0003] The flow rate of the metering pump can usually be adjusted steplessly within the range of 0-100%. According to the structural characteristics of the metering pump, when the flow rate is adjusted within the range of 10-100%, the metering accuracy can reach ±1%. When it is less than 10%, the flow control accuracy will be low, the cumulative error will be large, and accurate measurement cannot be achieved. [0004] In two cases, the flow r...

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Problems solved by technology

[0003] The flow rate of the metering pump can usually be adjusted steplessly within the range of 0-100%. According to the structural characteristics of the metering pump, when the flow rate is adjusted within the range of 10-100%, the metering accuracy can reach ±1%. When it is less than 10%, the flow control accuracy will be low, the cumulative error will be large, and accurate measurement cannot be achieved

[0004] In two cases, the flow rate of the metering pump may work in the range below 10%

[0005] The first one is that due to the change of the production process, the filling volume is reduced, and the injection pump must work below 10%;

[0006] The second is that when the flow rate is too small, such as the flow rate is less than 0.5L / h, there are few manufacturers producing small metering pumps, the manufacturing is difficult, the construction period is long, and the cost is too high. How can conventional metering pumps replace small flow metering pumps and use them? It is used for flow control below 10%

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