Thermal coupling multilevel pulsatron refrigerating machine

Abstract

The invention relates to a thermal-coupling multiple-pulse tube refrigerator which comprises a pre-cooling pulse tube refrigerator and a low-temperature pulse tube refrigerator, and is characterized in that the thermal-coupling multiple-pulse tube refrigerator also comprises a low-temperature pulse tube refrigerator thermal buffer tube connected between a low-temperature pulse tube refrigerator regenerator and a low-temperature pulse tube refrigerator room-temperature heat exchanger of the low-temperature pulse tube refrigerator; a pre-cooling pulse tube refrigerator cold head of the pre-cooling pulse tube refrigerator is connected with one end of the low-temperature pulse tube refrigerator regenerator close to the low-temperature pulse tube refrigerator thermal buffer tube via a heat bridge. Compared with prior art, the key of the thermal-coupling multiple-pulse tube refrigerator is that the room-temperature heat exchanger and the regenerator of the low-temperature pulse tube refrigerator are connected by the thermal buffer tube so that the total length of the regenerator is reduced; thereby reducing pressure loss and heat conduction loss in the regenerator, improving the refrigerator efficiency and achieving lower refrigerating temperature.

Description

field of invention [0001] The invention mainly relates to the field of refrigeration and low temperature, in particular to a heat buffer tube installed at the inlet of the regenerator of the low-temperature pulse tube refrigerator in a thermally coupled pulse tube refrigerator, thereby reducing the pressure drop loss and heat conduction loss of the regenerator Methods. Background technique [0002] Pulse tube refrigerators can be divided into gas-coupled and thermal-coupled types according to their coupling methods. A typical structure of a thermally coupled pulse tube refrigerator is as follows: figure 1 As shown, it is mainly composed of two parts: a pre-cooling pulse tube refrigerator and a low-temperature pulse tube refrigerator. The heater is pre-cooled. In this way, the working airflow entering the low-temperature pulse tube refrigerator is pre-cooled to a certain temperature, and then a lower cooling temperature is generated in the cold head. [0003] There are tw...

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Problems solved by technology

[0003] There are two disadvantages in such a structure: First, the inlet section of the regenerator of the low-temperature pulse tube refrigerator is the part between the inlet of the refrigerator and the heat bridge. After this period, a large pressure amplitude loss will occur, which is not conducive to obtaining a lower refrigeration temperature; second, the existence of the regenerator filler in the regenerator at the inlet section increases the heat conduction loss, which is not conducive to improving the performance of the refrigerator

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