Cryogenic refrigerating unit with controllable air input

Abstract

The invention discloses a low temperature freezing device that could control the air intake quality. It is made up of compressor, by-pass valve, plane rotate valve, the first pressure gauge, regenerator, aqueduct, pinhole valve, the second pressure gauge and garage. The heating piece is set at the cool end of the impulse pipe. The thermometer is set on the heat return machine and impulse pipe. The di-directional gas intake valve is set between the hot end of the impulse pipe and the air intake end. The invention would vary the refrigeration temperature in a wide range under the condition of constant refrigeration quality, and have good limitation function to the direct current caused during low temperature refrigeration. The invention is simple structure and easy to adjust and control.

Description

technical field [0001] The invention relates to a low-temperature refrigeration device with controllable intake air volume, which suppresses the occurrence of direct flow and controls the refrigeration temperature range of the refrigerator by controlling the intake air volume of the refrigeration system. Background technique [0002] In the development of science and technology today, cryogenic technology often plays a key role. As an important branch of cryogenic technology, small cryogenic refrigerators play an important role in many aspects. However, the poor reliability of cryogenic refrigerators restricts its practical application, and the emergence of pulse tube refrigerators solves this problem, because there are no moving parts inside it, and long-life operation can be achieved. [0003] A pulse tube refrigerator is a device that uses high and low pressure gas to fill and deflate the cavity of the pulse tube to obtain a cooling effect. The cooling capacity and tran...

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Problems solved by technology

[0009] On the other hand, in low-temperature measurement, many measurements do not require a high cooling capacity, but the requirements for the measured temperature range are relatively large, and the stability and accuracy of the measured temperature are relatively high. The traditional low-temperature refrigerator corresponds to a certain The temperature has a certain cooling capacity. When the cooling capacity is constant, it is difficult to adjust the temperature range, and it may produce a direct current phenomenon when adjusted to a certain temperature, which will cause large fluctuations in the cooling temperature and greatly improve the measurement accuracy. , which is absolutely not allowed for low temperature measurement, which also limits the application of cryogenic refrigerators in low temperature measurement

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