The invention relates to the technical field of biological collection storage equipment, in particular to a self-expansion
cascade ultralow-temperature
refrigeration house for biological collection
insect killing, which comprises a
refrigeration house body, a
refrigeration system, a
control system and an
insect killing program. Through
cooperative work of the R404A high-temperature-stage refrigeration
system and the R23 low-temperature-stage refrigeration
system in the refrigeration system, the effect of rapidly reducing the
room temperature in a refrigeration house body is achieved, the requirement of
insect killing for low-temperature
impact is met, stable control over start-stop or
mode switching is achieved through self-expansion
pressure reduction of an
expansion tank arranged in the
cascade refrigeration unit, and the control over the low-temperature
impact is achieved. By means of direct cooperative arrangement of a
PID regulator, a PLC and a temperature and
humidity sensor in the
control system, refrigeration parameters are dynamically regulated and controlled, the situation that the insecticidal effect is affected by temperature and
humidity fluctuation is avoided, meanwhile, the situation that collections are damaged due to
improper temperature control is avoided, and by arranging corresponding heating devices at an observation window and a humidifier, the overall operation reliability of the refrigeration house is improved.