Throttling refrigerator and infrared detector

The utility model relates to the technical field of throttling refrigerators, and provides a throttling refrigerator which comprises an air inlet flange, a mandrel, a heat exchange tube and a throttling hole and further comprises a self-adjusting structure for adjusting the size of the throttling hole, the self-adjusting structure comprises an air inflation cavity located in the mandrel and a self-adjusting element stretching out and drawing back along with the pressure change of the air inflation cavity, and the self-adjusting element is arranged in the air inflation cavity. The air inlet flange is provided with a refrigerating air inlet communicated with the heat exchange pipe and a self-adjusting air inlet communicated with the inflation cavity. The utility model further provides an infrared detector which is integrated with the throttling refrigerator. The air inlet flange is provided with the refrigerating air inlet and the self-adjusting air inlet, and the inflation cavity can be sealed after the self-a