Novel pulse tube refrigerator

Abstract

The invention discloses a novel pulse tube refrigerator. The novel pulse tube refrigerator comprises a cold head body and an air inlet tube, the air inlet tube is arranged on the side wall of the coldhead body, a first-stage refrigerating system is arranged at the bottom of the cold head body, a spiral pipeline and an expansion cavity are arranged in the cold head body, the two ends of the spiralpipeline communicate with the upper end of the air inlet tube and the upper end of the expansion cavity correspondingly, and the bottom of the expansion cavity communicates with the first-stage refrigerating system; the novel pulse tube refrigerator further comprises a second-stage refrigerating system; the spiral pipeline is arranged between the air inlet pipe and the expansion cavity, and high-pressure helium is prevented from directly and suddenly entering the expansion cavity from the air inlet pipe to cause vortex loss and total pressure loss through transition of the spiral pipeline, sothat flowing of the high-pressure helium in the spiral pipeline is close to heat insulation isentropic flowing, flowing loss is small, energy of a high-pressure air source is utilized to the maximumextent, and therefore, the refrigeration efficiency is improved; and the first-stage refrigerating system and the second-stage refrigerating system are arranged, graded refrigerating is achieved, andthe refrigerating effect is improved.

Description

technical field [0001] The invention relates to the technical field of refrigerators, in particular to a novel pulse tube refrigerator. Background technique [0002] The new pulse tube refrigerator uses high-pressure gas to be adiabatically evacuated to achieve the purpose of refrigeration. In the existing new pulse tube refrigerator, after high-pressure helium enters the cold head body, it directly enters a large expansion cavity through the intake pipe, resulting in a huge eddy current loss and total pressure loss, plus the entire cold head The volume and space of the expansion cavity on the upper part of the body are limited, thereby affecting the cooling efficiency; and due to the constraints of the size of the existing cold head space, it is impossible to directly adopt the flow layout with a gradual transition in a straight line, and there are many inconveniences in use. Contents of the invention [0003] The object of the present invention is to provide a novel pul...

AI Technical Summary

Problems solved by technology

In the existing new pulse tube refrigerator, after high-pressure helium enters the cold head body, it directly enters a large expansion cavity through the intake pipe suddenly, resulting in a huge eddy current loss and total pressure loss, plus the entire cold head The volume and space of the expansion cavity in the upper part of the body are limited, which affects the cooling efficiency; and due to the constraints of the size of the existing cold head space, it is impossible to directly adopt the flow layout with a straight line and gradual transition, which is inconvenient to use

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