中文摘要：

冷冻空间温度上下波动时,门封软硬吸合面周期性地吸入外界热空气和呼出内部冷空气的“呼 吸效应”导致能耗上升.为了减弱其不利影响,需要掌握“呼吸效应”的机理.本文通过实验研究了冷冻空间内外压差和初始门封吸合应力对软硬吸合面空气渗透量的影响规律.实验结果表明,在冷冻空间正常工况运行对应的软硬吸合面内外压差范围（-100 Pa-100 Pa）内变化时,单位长度软硬吸合面渗透量对应变化范围为（-0.175-0.9） L/（m· min）.在相同初始吸合应力下,渗透量绝对值随压差绝对值增大而增大,且在负压工况下为线性关系,在正压工况下为非线性关系;在相同内外压差工况下,初始吸合应力从487 Pa 增大到924 Pa时,渗透量绝对值随吸合应力的增加而减小,渗透量绝对值最大减小接近60%.

英文摘要：

When the temperature of refrigeration room fluctuates, the outside hot air and inside cold air of refrigeration room flow across the magnetic seals periodically, which is called breathing effect and leads to the increase of energy consumption. To reduce the adverse effect, mechanism of breathing effect should be investigated. In this paper, the influence of some factors including pressure difference and initial actuation stress on air infiltration are investigated. Results show that, when the pressure difference of inside and outside air changes within the ranges corresponding to the normal operation conditions for the refrigeration room （-100 Pa- 100 Pa）, the air infiltration through unit length magnetic seals varies from （-0.175-0.9） L/（m·min）. Within the same initial actuation stress, the absolute air infiltration increases with the increase of absolute pressure difference, and has a linear relationship with absolute pressure difference under negative pressure conditions, while it has a nonlinear relationship under positive pressure conditions. With the increase of initial actuation stress from 487 Pa to 924 Pa, the air infiltration of the same pressure difference shows a maximum decrease of nearly 60%.