Cooling liquid temperature-adjustable circulating device and method

Abstract

The invention discloses a cooling liquid temperature-adjustable circulating device and method. The cooling liquid temperature-adjustable circulating device comprises a liquid nitrogen cooling device, a heat exchanger, a cooling liquid circulating device and a valve flow control device. The liquid nitrogen type cooling liquid circulation device (1) is characterized in that a heat exchange part (11c) of a heat dissipation pipe (11) is additionally arranged in a tank (10) filled with liquid nitrogen, a pump (14) is connected into a pipeline (13), the liquid nitrogen in the tank is circulated through a liquid nitrogen storage tank (2), and the pump conveys the liquid nitrogen into a pipeline (20) of the liquid nitrogen storage tank, and the liquid nitrogen type cooling liquid circulation device (1) is characterized in that an electric proportional valve (21) is arranged in the heat dissipation pipe (11); the flow control part is used for controlling the flow of cooling liquid fed into the heat exchange part; and an electromagnetic valve (22) for controlling the switching time so that the cooling liquid, the flow rate of which is controlled by the electric proportional valve, reaches the optimal flow rate and is fed into the heat exchange part. The electric proportional valve (21) is controlled so that the flow rate is suitable for heat exchange of liquid nitrogen in the heat exchange unit or is slightly greater than the heat exchange requirement at or above a low flow rate limit value that can be controlled by the electric proportional valve (21).

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