Chiller also known as low temperature cooling water circulation pump, cryogenic pump, low temperature circulation pump, low temperature cooling circulation pump, etc. It is a low-temperature equipment that uses a compressor for mechanical refrigeration. The tank has a volume of 5L. The lowest temperature at no load can meet -23°C~-120°C, and the temperature can be adjusted from -10°C to -120°C. On the basis of refrigeration, a circulating water pump is added to enable the cooled liquid to pass through the pipeline for external circulation and internal circulation, and can provide low temperature for external equipment such as double-layer glass reactor, organic synthesis device, rotary evaporator, etc. The liquid can also be combined with a rotary evaporator, a vacuum freeze drying oven, a circulating water vacuum pump, a magnetic stirrer and the like to perform chemical reaction operations and drug storage at a multi-functional low temperature.