As we all know, the metering pump is mainly composed of three parts: power drive, fluid delivery and adjustment control. The power drive device drives the fluid delivery diaphragm (piston) to reciprocate through the mechanical linkage system: the diaphragm (piston) will be sucked by the delivery fluid in the first half of the stroke and will discharge the fluid out of the pump head in the second half of the stroke; therefore, the reciprocating motion of the stroke is changed The frequency or every reciprocating movement is well known, and the metering pump is mainly composed of three parts: power drive, fluid delivery and adjustment control. The power drive device drives the fluid delivery diaphragm (piston) to reciprocate through the mechanical linkage system: the diaphragm (piston) will be sucked by the delivery fluid in the first half of the stroke and will discharge the fluid out of the pump head in the second half of the stroke; therefore, the reciprocating motion of the stroke is changed The frequency or the stroke length of each reciprocating motion can achieve the purpose of adjusting the fluid delivery volume. Precise machining accuracy guarantees each pump output and realizes precise metering of the conveyed medium. Due to the difference in power drive and fluid delivery methods, mechanical metering pumps can be roughly divided into two types: plunger type and diaphragm type. 2.1. Plunger metering pumps There are mainly two types of valved pumps and valveless pumps. Plunger metering pumps are widely used in the petrochemical industry due to their simple structure and high temperature and high pressure resistance. Aiming at the shortcomings of ordinary plunger pumps for high-viscosity media under high pressure conditions, a valveless rotary plunger metering pump has received more and more attention and is widely used in high-viscosity media such as syrup, chocolate and petroleum additives. Metered addition. Due to the structural shortcoming of the inability to achieve complete isolation between the metered medium and the lubricant in the pump, plunger metering pumps are subject to many restrictions in fluid metering applications with high anti-pollution requirements. 2.2. Diaphragm metering pump As the name implies, the diaphragm metering pump uses a specially designed and processed flexible diaphragm to replace the piston, realizes reciprocating motion under the action of the driving mechanism, and completes the suction-discharge process. Due to the isolation effect of the diaphragm, the isolation between the metered fluid and the driving lubrication mechanism is truly realized in structure. High-tech structural design and the selection of new materials have greatly improved the service life of the diaphragm. Coupled with the excellent corrosion resistance of composite materials, diaphragm metering pumps have become the main pump type in fluid metering applications. Among the members of the diaphragm metering pump family, the hydraulically driven diaphragm pump uses hydraulic oil to drive the diaphragm evenly, which overcomes the shortcomings of excessively concentrated force on the pump diaphragm under the mechanical direct drive mode, and improves the life of the diaphragm and the upper limit of working pressure. In order to overcome the possible working failures of single-diaphragm metering pumps due to diaphragm breakage, some metering pumps are equipped with diaphragm breakage sensors to realize automatic interlock protection when the diaphragm ruptures; metering with a double diaphragm structure pump head further improves its safety It is suitable for applications that are particularly sensitive to safety protection. As a kind of diaphragm metering pump, electromagnetic driven metering pump uses electromagnet to generate pulsating driving force, eliminating the need of motor and speed change mechanism, making the system small and compact, and it is an important branch of small-range low-pressure metering pump. Now, the precision metering pump technology is very mature. Its fluid metering and conveying capacity can reach 0-100,000l/h, and its working pressure can reach 4000 bar. The working range covers the requirements of all areas of industrial production. Third, the control of the metering pump The fluid pumping volume of the metering pump each time determines its metering capacity. Under a certain effective diaphragm area, the volume flow of the output fluid of the pump is proportional to the stroke length L and stroke frequency F: V∝A*F*L Under the condition of determining the metering medium and working pressure, by adjusting the stroke length L and stroke frequency F can realize the two-dimensional adjustment of the output of the metering pump. Although both stroke length and frequency can be used as adjustment variables, in engineering applications, the stroke length is generally regarded as a coarse adjustment variable, and the stroke frequency is a fine adjustment variable: adjust the stroke length to a certain value, and then achieve fine adjustment by changing its frequency to increase Adjustment flexibility. In relatively simple applications, the stroke length can also be manually set, and only the stroke frequency is used as the adjustment variable, thus simplifying the system configuration.
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