Plunger pump used for pumping ultralow-temperature liquid nitrogen

Abstract

The invention relates to a plunger pump used for pumping ultralow-temperature liquid nitrogen, which comprises a power end and a cold end, wherein the cold end comprises a cold end shell; one end of the cold end shell is provided with a plunger; the other end of the cold end shell is provided with a suction inlet and an exhaust port; the positions of the suction inlet and an exhaust port of the cold end shell are provided with a valve seat; one end of the plunger is connected with a power end; the other end of the plunger is mutually matched with the cold end shell and the valve seat to form an inner cavity; the valve seat is provided with a first channel and a second channel, wherein the first channel is used for communicating the inner cavity with the suction inlet; the second channel is used for communicating the inner cavity with the exhaust port; a lower-pressure valve used for controlling the liquid nitrogen to be sucked into the inner cavity is arranged between the first channel and the inner cavity; a high-pressure valve used for controlling the liquid nitrogen to be discharged out of the inner cavity is arranged in the second channel; the plunger is driven by the power end to carry out linear reciprocating motion in the inner cavity so as to drive the lower-pressure valve or the high-pressure valve to be opened and closed; when the low-pressure valve is opened, the liquid nitrogen enters the inner cavity from the suction inlet; when the high-pressure valve is opened, the liquid nitrogen is discharged out of the inner cavity from the exhaust port; and the cold end shell is provided with an overflow port communicated with the inner cavity.

Description

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AI Technical Summary

Benefits of technology

This new type of piston pumps has several technical benefits compared with previous designs such as being less prone to absorbing or losing heat during operation due to their design. They also have improved performance when handling liquids at very low temperatures (<-20°C). Additionally they use an ice coolant instead of refrigeration systems to reduce energy consumption by reducing thermal load on components like motors. These improvements make them better than older versions more efficient while still maintaining good efficiency over longer periods of usage.

Problems solved by technology

This technical issue addressed in this patents relates to improving the performance or reliability of conventional hydropneumatic nitrotrusion generators (NGs) for use at extreme temperatures such as those found during well drilling operations due to their poor thermal response characteristics caused by the liquefied nitrous gases released from them.

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