D type multistage boiler feeding pump overview:
It is widely applied to supply water of low or high pressure
boiler. It is also used for high pressure water supply and drainage
of industrial and urban. The temperature of medium delivered should
be in the range of -20°C to 150°C and the water pump inlet pressure
should be less than 0.6M Pa.
1. About D model Pumps, inlet and exit are both vertically upward.
The inlet section, middle section, discharge section and bearing
body of pump are connected into one by tightening bolt. Customer
can decide the pump stage according to pump head.
2. The rotor part of pump is composed of axis, impeller, shaft
sleeve and balance disk, etc. The quantity of impeller is decided
by the stage quantity of pump. The components of axis are connected
by flat key and spindle nuts. The whole rotor is supported by
antifriction bearing or sliding bearing. Balance disc bears axial
force instead of bearing. When pump is running, the rotor can move
in the same axial direction. Annular ball bearing can not be used
about this series of pumps. They are adopted antifriction bearing.
Antifriction bearing is lubricated by grease and sliding bearing is
lubricated by thin oil. In addition, they can lubricate themselves
by oil ring and cool themselves by circulation water.