Centrifugal pump for handling of liquid chlorine
First Claim
1. A machine for pumping liquids, particularly liquid chlorine, comprising a shaft sump pump mounted in a housing, the interior of which is hermetically sealed from the atmosphere, said pump having a rotary shaft mounted in an overhung position, the upper portion of said shaft adapted to be rotated by drive means positioned outside of said housing, a shaft seal provided about said rotary shaft outside of the hermetically sealed housing and out of contact with the pumped liquids, a tubular supporting element surrounding the portion of the shaft within said housing, inlet means for admitting liquids into said pump within said housing, a pressure pipe for evacuation of liquid and means for admitting a compressed inert gas into the interior of said housing and said supporting element at a pressure such that the liquid cannot penetrate into said housing and contact said shaft seal when the pump is idle.
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Accused Products
Abstract
A machine for pumping liquid chlorine employs an upright shaft sump pump which is confined in a hermetically sealed housing and has a tubular supporting element surrounding the pump shaft. The latter is mounted in overhung position and is adjacent to a pressure pipe which conveys the pressurized liquid. The shaft seal is kept out of contact with the liquid by the housing as well as by a body of inert gas which is supplied to the interior of the housing and to the space between the shaft and the tubular element at a pressure depending on the pressure of inflowing liquid chlorine and being sufficiently high to prevent the inflow of liquid chlorine into the housing and/or tubular element when the pump is idle. The main impeller on the pump shaft is made integral with an auxiliary impeller which constitutes a hydrodynamic shaft seal and prevents the flow of conveyed liquid chlorine into the tubular element from below.
79 Citations
9 Claims
- 1. A machine for pumping liquids, particularly liquid chlorine, comprising a shaft sump pump mounted in a housing, the interior of which is hermetically sealed from the atmosphere, said pump having a rotary shaft mounted in an overhung position, the upper portion of said shaft adapted to be rotated by drive means positioned outside of said housing, a shaft seal provided about said rotary shaft outside of the hermetically sealed housing and out of contact with the pumped liquids, a tubular supporting element surrounding the portion of the shaft within said housing, inlet means for admitting liquids into said pump within said housing, a pressure pipe for evacuation of liquid and means for admitting a compressed inert gas into the interior of said housing and said supporting element at a pressure such that the liquid cannot penetrate into said housing and contact said shaft seal when the pump is idle.
Specification