Liquid nitrogen low-temperature oil cooling unit

Abstract

Disclosed is a liquid nitrogen low-temperature oil cooling unit comprises an evaporator, a pipeline connected with the evaporator is arranged on one side of the evaporator, the other end, away from the evaporator, of the pipeline is connected with an exhaust valve and a liquid supply valve, a pipeline is arranged on the other side of the evaporator, and an oil supply valve and a gas-liquid separator are arranged at the other end of the pipeline. A pipeline connected with the gas-liquid separator is arranged on the other side of the gas-liquid separator, the other end of the pipeline is connected with an oil return valve, a pipeline is arranged at the upper end of the gas-liquid separator, and an expansion oil tank is arranged at the other end of the pipeline. The invention has the beneficial effects that a liquid nitrogen circulating system and an oil circulating system are integrated, single-phase flow heat transfer and high temperature control precision are achieved, the vacuum degree is kept not to exceed the upper limit, the circulating pump driven by magnetic force and a pipeline all-welding process are adopted, and the plate heat exchanger with the built-in reinforcing plate is high in heat exchange coefficient and suitable for low-temperature use requirements; the invention is suitable for silicon-based heat-conducting oil and fluorine-based heat-conducting oil.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a liquid nitrogen low-temperature oil cooling unit. Background technique [0002] The boiling point of liquid nitrogen at one atmospheric pressure is -196°C. Liquid nitrogen refrigeration is generally used in occasions that require cryogenics, such as food freezing, medical treatment, scientific experiments, and industrial production. [0003] At present, most of the applications of liquid nitrogen on the market are direct throttling of liquid nitrogen, evaporating into nitrogen gas, low-temperature nitrogen or gas-liquid mixed state directly contacting the object to be cooled, or entering the cold side of the partition wall heat exchanger, and cooling the object Cool down. This application method has certain limitations in the temperature range and temperature control accuracy, because the medium temperature required by most industrial occasions is -20°C to -100°C, and th...

AI Technical Summary

Problems solved by technology

This application method has certain limitations in the temperature range and temperature control accuracy, because the medium temperature required by most industrial occasions is -20°C to -100°C, and the evaporation temperature of liquid nitrogen is -196°C. The heat exchange temperature difference with the hot side is too large, and the phase change latent heat of liquid nitrogen is large, so it is difficult to achieve a uniform temperature field, which is not conducive to the uniformity and stability of the target temperature

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