Low-vibration integrated dual-drive Stirling cryocooler supported by a plate spring

Abstract

The invention discloses a low-vibration integrated dual-drive Stirling cryocooler supported by a plate spring. The cryocooler comprises a shock absorber, a compressor, an expansion machine and a hot end heat exchanger. The expansion machine, the compressor and the shock absorber are arranged on the same shaft, and an expansion piston shaft penetrates through a compression piston middle hole to be connected with an expansion machine plate spring and an expansion machine motor. A compressor motor and the expansion machine motor are both moving coil type linear motors, and compared with a moving magnet type linear motor, the radial vibration is small. A compression piston and an expansion piston adopt gas bearings in respective cylinders, and roots of the compression piston and an expansion piston shaft are supported by the single-side plate spring so as to provide restoring force. The shock absorber is installed at the rear portion of the expansion machine, and axial vibration is reduced. The expansion piston and the compression piston are both connected with a displacement sensor, active control is conducted on the phase of the expansion piston relative to the compression piston through the expansion machine motor, and efficient operation of the cryocooler is kept. The cryocooler has the characteristics of a compact structure, small vibration and high efficiency.

Description

technical field [0001] The invention relates to a Stirling refrigerator, in particular to a low-vibration integrated Stirling refrigerator supported by a leaf spring. Background technique [0002] The infrared detection system has the advantages of high resolution, good concealment, and excellent anti-interference performance. It is widely used in aerospace infrared remote sensing, medical, military, communication, and poisonous gas monitoring. However, the infrared detector will be very large after being cooled at a low temperature. To a certain extent, the response speed is improved, the sensitivity is improved, the detection range is increased, and the influence of background noise is reduced. Therefore, the Stirling refrigerator with compact structure, fast start-up, and wide temperature control range is widely used to cool the focal plane of infrared detectors. The compressor and expander of the split Stirling refrigerator have sideways air in and out, with radial force...

AI Technical Summary

Problems solved by technology

The movement of the expansion piston of a single-drive Stirling refrigerator is mainly controlled by the gas force and the plate spring of the expansion piston, and it is difficult to ensure a high-efficiency phase difference relative to the movement of the compression piston.

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