Patent ID: 8512459

Claim:
A pre-concentration device for an ion mobility detection apparatus, comprising: a collecting passage configured to collect a gas mixture including substances to be detected; a sieve provided, in a deploy state, within the collecting passage and configured to separate the substances to be detected from the gas mixture, the separated substances to be detected being absorbed to the sieve; at least one desorption unit configured to desorb the substances that have been absorbed to the sieve, the sieve being received in a wound state in the desorption unit; and a driving device configured to drive the sieve to be movable between an absorption position in which the substances to be detected are absorbed to the sieve in the collecting passage, and a desorption position in which the substances to be detected are desorbed from the sieve in the at least one desorption unit; wherein each desorption unit comprises: a sieve drum around/from which the sieve can be wound/unwound; and a heating barrel including a heating unit to heat the sieve received therein and wound on the sieve drum; the heating barrel comprising a barrel body with two open ends and a heating barrel cover connected to an end of the barrel body; and the heating unit comprising an internal heating member and an external heating member connected to the heating barrel cover, wherein the internal heating member is provided inside of the sieve drum, and the external heating member is provided outside of the sieve drum.