Patent ID: 9562533
Date: 2017-02-07
CPC Classifications: F04B,F04D

Claim:
1. A cryogenic pump for liquefied gas for applying a pressure difference to the liquefied gas so as to pump-transfer the gas, the cryogenic pump comprising: a motor; and an impeller driven by the motor to cause pump-transfer of the liquefied gas, wherein the motor and the impeller are coupled to each other by a rotation transmitting structure configured for transmitting a rotative drive force therebetween, wherein the motor and the impeller are arranged so that the motor is positioned on an upper side and the impeller is positioned on a lower side, wherein the motor and the impeller exist in an enclosed space into which the liquefied gas is introduced, wherein the enclosed space comprises a space for the motor, a space for the impeller and a space for at least a part of the rotation transmitting structure, wherein the space for the motor is positioned above the space for the impeller, wherein the cryogenic pump further comprises a heat adjusting unit between the motor and the impeller and residing in an atmosphere, wherein the heat adjusting unit comprises a heat adjusting housing that forms the space for the at least part of the rotation transmitting structure, the rotation transmitting structure and heat adjusting unit configured to maintain a temperature in the impeller space in a range in which the liquefied gas is in its liquid phase and to maintain a temperature in the motor space in which the liquefied gas therein is in its gaseous phase, wherein the heat adjusting unit comprises a plurality of fins configured to cause heat to conduct between the atmosphere and rotation transmitting structure through the heat adjusting housing.