皮囊式蓄能器快速增压过程

Quick plenum process of bladder accumulator

应用热力学理论对用于深海微生物取样器保压的皮囊式蓄能器快速增压过程进行分析。研究结果表明:皮囊式蓄能器的快速增压过程可分为一个绝热过程和一个复杂的多变过程;在室温情况下,当蓄能器单次快速增压至60 MPa后,其最终压力只有55 MPa;蓄能器快速增压后能获得的最终压力与蓄能器增压的速度、最高压力和次数有关;采用减慢蓄能器的增压速度、增压时最大压力略大于最终设定压力和多次重复增压这3种方法均能保证蓄能器最终达到设定的压力,但减慢蓄能器的增压速度方法不能满足快速增压的要求,增压时最大压力略大于最终设定压力方法在实际操作时难以确定最高的充气压力,多次重复增压方法能有效保证蓄能器最终压力,可以在实际中使用。

Thermodynamics theory gastight was used to analyze the quick plenum process of bladder accumulator used for deep sea microbe gastight sampler. The results show that the quick plenum process can be divided into two stages, i.e. the adiathermal stage and complex polytropic stage. At room-temperature, accumulator can get a final pressure of 55 MPa with single quick plenum to 60 MPa. The final pressure of bladder accumulator is related with plenum velocity, maximum plenum pressure and times of the plenum. Reducing the plenum velocity, increasing the maximum plenum pressure and repeating plenum are three methods to get accurate final pressure. The first method can be used to meet the demand of quick plenum. It is difficult to be used to determine the maximum pressure using the second method. The third method is efficient and can be used in practical.