| 摘要 |
A liquefied gas transfer apparatus having a recirculation passage for recirculating the liquefied gas sucked into a glandless pump back into the closed tank, and a device for changing the speed of the pump driving motor by suitable measures such as pole change, Y- DELTA switching, frequency control, primary voltage control or the like. In operation, the pump is driven at a high speed during the transfer of the liquefied gas from the tank to the containers or the like, whereas, in the period in which the transfer of the gas in not necessary, the pump is continuously operated at a low speed while recirculating the liquefied gas through the recirculation passage, thereby to prevent the evaporation of the liquefied gas in the pump to ensure smooth and safe intermittent operation of the pump, as well as prolonged life of the bearing. The operation of the pump at the low speed considerably saves the electric power in the period requiring no transfer of the liquefied gas, so that the overall economy of the apparatus is improved remarkably. |
| 申请人 |
KABUSHIKI KAISHA TEIKOKU DENKI SEISAKUSHO, OSAKA, JP |
发明人 |
TSUKAMOTO, MASUYA, IBO, HYOGO, JP |
