| 摘要 |
A nozzle for attachment to a fluid-containing tank which is capable of applying negative air pressure to and establishing negative air pressure within the interior of the tank by forcing compressed air flow through the nozzle is provided by the present invention. The nozzle includes a vacuum pipe having an elongated generally cylindrical wall with first and second ends spaced apart, establishing a negative air pressure chamber therein that is capable of fluid communication with the interior of the tank when the nozzle is attached to the tank. The vacuum pipe is attachable to an opening of the tank at one end and open to ambient air at the other end, and openings exist through the wall of the vacuum pipe extending into the negative air pressure chamber. An air flow pipe surrounds the vacuum pipe, establishing an annular chamber therebetween. The air flow pipe is open to ambient air at the end adjacent the end of the vacuum pipe that is open to ambient air. In operation, compressed air is passed into the annular chamber, and the compressed air flows through the openings into the negative air pressure chamber, establishing negative air pressure therein, and further establishing negative air pressure within the interior of the tank.
|
