A new type of magnetic circulating pump has been designed and developed. It has the characteristics of good sealing performance and stable operation over a long period of time. It can be applied to the vapor-liquid equilibrium test in a wider temperature range. The magnetic circulating pump uses an external magnetic drive, to avoid thermal and chemical contamination of the fluid. Therefore, the magnetic circulating pump can provide the power for the vapor phase or the liquid phase in the vapor-liquid equilibrium test system and is one of the key components of the whole system. 1, Preface The vapor-liquid phase equilibrium research as a branch of thermodynamics, engineering thermophysics basic research content. After years of development, there are various experimental and research methods for the vapor-liquid phase equilibrium. Among them, the vapor-phase single-cycle method is widely used due to the advantages of simple operation, less sampling, and higher testing accuracy [1]. Gas-liquid cycle vapor-liquid phase equilibrium test system shown in Figure 1, the upper part of the balance in the vapor phase of the working fluid in the circulating pump driven by circulating pump, through the circulating pump, and then return to the bottom of the balance in the bubble During the ascending process, the liquid-phase working medium in the equilibrating kettle finishes heat and mass transfer, so that the components in the equilibration kettle reach a uniform state. Figure 1 vapor-liquid phase equilibrium test system used in the vapor-liquid phase equilibrium test magnetic circulating pump must have the conditions are: (1) small size, high working pressure, if used in low-temperature gas-liquid equilibrium test must also be resistant Low temperature; (2) small circulating flow, easy to adjust, no chemical and thermal pollution; (3) continuous working time, because the vapor-liquid phase equilibrium test cycle is longer, so the magnetic circulating pump requires stable and long working hours. Ordinary commercial circulation pump in the flow, adjustability, low temperature resistance is difficult to meet the needs of this type of test circulation pump are generally designed. Abroad, Ruska WE A and other developed a magnetic pump, the use of the piston cylinder structure, flow moderate, in order to reduce the blow-by gas, the piston and the cylinder between the better [2]; In addition Jong Sung L im used in the experiment A circulation pump, the flow is very small, only 0.145 ~ 0.172ml / s [3]. In China, Han Xiaohong of Zhejiang University used an electromagnetic circulating pump for vapor-liquid phase equilibrium test [4], Hou Shuxin of Tsinghua University developed a magnetic pump driven by a crank-and-rod mechanism [5], Zhan Shi-ping of Dalian University A patent for the invention of a magnetic circulating pump characterized by the permanent magnets installed inside and outside the cylinder [6]. This subject has developed a kind of electromagnetic pump that can be applied to the phase equilibrium test. However, the electromagnet has low efficiency and large calorific value and therefore can not operate for a long time [7]. In order to meet the needs of the new high-precision vapor-liquid phase equilibrium test system, a new type of magnetic circulating pump was designed in this project. 4, the conclusion of the design of the new magnetic circulating pump can work stably for a long time; 2. 5MP pressure seal is good; flow rate can be continuously adjustable 130.56 ~ 381.96ml / min; at the test stepper motor speed Operating efficiency is higher than 0.88.
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