| 主权项 |
1. A cartridge seal for a centrifugal pump comprising:
a structure having a first end and a second end to which a shaft tube assembly of the cartridge seal is attached; a shaft tube of the shaft tube assembly having a first end with a larger outside circumference than a second end of the shaft tube, and an interior portion of the shaft tube that receives a shaft of the centrifugal pump; a shaft collar attached to the second end of the shaft tube in communication with the second end of the structure; a chamber tube of the shaft tube assembly in communication with the first end of the shaft tube, the first end of the structure, and a portion of the shaft tube between the first end of the shaft tube and the second end of the shaft tube, wherein the chamber tube and the shaft tube collectively define a chamber that contains compressed gas; and a spring located in the chamber of the compressed gas, wherein the compressed gas and the spring cause the shaft tube assembly to substantially prevent movement of fluids between the shaft and the structure in the centrifugal pump. |
