The present application relates to the field of low temperature biological preservation technology, and particularly relates to a low temperature biological sample transportation
storage tank, which comprises an inner tank body provided with a vacuum interlayer and a double-layer structure, an inner tank body is internally provided with a placing rack for fixing biological sample storage equipment, and further comprises an outer tank body provided outside the inner tank body and provided with a heat preservation layer between the inner tank body and the outer tank body; a placing
pipe is provided on the inner tank body and used for leading to the inside of the inner tank body. A normally closed sealing mechanism is arranged at the bottom of the placing
pipe, the opening operation of the mechanism is driven by a gear and a rack, and a cooling mechanism is synchronously driven. When the disadvantageous operation of opening the placing
pipe to access the sample occurs, the higher temperature
nitrogen gas in the upper part of the
gas phase zone can be automatically drawn back into the
liquid nitrogen to be cooled and condensed, the temperature of the
gas phase zone is effectively reduced, and the
thermal shock of the sample
exposure is reduced. Meanwhile, the
gaseous nitrogen gas is pressed back into the
liquid nitrogen, the partial
liquefaction of the
gaseous nitrogen gas is promoted, and the loss of the
liquid nitrogen caused by the opening operation is reduced.