| 摘要 |
PURPOSE:To prevent the generation of a flush and recover a drain fluid without changing the floor form of a building by mourning a contact type shaft seal member provided in a position closer to the outside from a second shaft seal member in a seal box. CONSTITUTION:In the inner part of a seal box 2, a third shaft seal member 7 of contact type is mounted along first and second shaft seal members 3, 4. It is mounted in the state situated on the outside of the second shaft seal 4 with a second space part between and seals the inside of the seal box 2 from the outside, whereby the seal box 2 is made into a space chamber having a pressure higher than the atmospheric pressure. Thus, even if the internal fluid in the pump is leaked to the seal box, the fluid is prevented from causing a flush, the generation of a water hammer is prevented, and the pressure of the fluid passing through the seal box is never reduced lower than the atmospheric pressure. Further, as the drain fluid can be guided to a desired upper position, the drain fluid can be recovered without changing the floor form of a building. |
