Low-temperature circulating pump in working condition, due to impeller rotation, the continuous flow of liquid from the inside into the pipe, after the pump body, the discharge from the pump port. 　　 First, let's talk about the way the pump works. When the pump is in use, the pump body is filled with water. Under the high-speed rotation of the electric motor, the pump impeller rotates at a high speed. Therefore, the water in the impeller Also will spin up, under the action of the centrifugal force in the pump body, the liquid is discharged through the outlet pipe, and after the water is discharged, a vacuum is formed near the rotating shaft in the pump housing. 　　 When the pump is full of water, centrifugal force is generated when the impeller rotates. Impeller center pressure is reduced due to the water in the impeller channel under centrifugal force thrown around the periphery of the pump casing, the pressure is generally lower than the pressure into the steam pipe, water in the pressure difference by the inflow of the pool Impeller. This water pump can continue to water constantly water supply. The water in the water pipe under the pressure of the outside world, was pressed into the bounce fill the vacuum. Therefore, as long as the impeller rotation, the water flow continuously into the tangential direction of the inlet into the pump outlet. 　　 This completes the entire workflow. Low-temperature circulating pump to take the mechanical form of refrigeration cryogenic liquid recycling equipment, the machine with vacuum freeze-drying, circulating water-based vacuum pump, magnetic stirring and other equipment for multi-functional low-temperature chemical reaction operations and drug storage. Has to provide low temperature liquid, low temperature water bath role. 　　 Low temperature coolant circulation pump in the working state, by the built-in circulating pump will be low-temperature liquid pumped tank to the desired cooling experimental device, and then, the cryogenic liquid is returned to the cryogenic tank cooling, so continuous continuous cooling. 　　 First of all, to introduce the work of the pump body, the pump when in use, first filled with liquid to the pump body, driven by the motor speed, the pump impeller to pump the liquid from the rotation, and then under the centrifugal force of the pump body, Discharge liquid from the outlet pipe 　　 The next is the cooling temperature control, according to the control system is a bit control, according to the low temperature coolant circulation device is the mechanical control. This low temperature cycle equipment in the customer set the experimental temperature range, the refrigeration system output cooling capacity, the liquid temperature is cooled to the required operating temperature range on it. 　　 This completes the entire work flow. The machine can cooperate with rotary evaporator, reactor, vacuum freeze-drying oven, circulating water vacuum pump, magnetic stirrer and other equipment for multi-functional low temperature chemical reaction operations and drug storage. Has to provide low temperature liquid, low temperature water bath role.