The condensate pump KSV 500-150-1 is a centrifugal, vertical, two-casing, two-stage pump, with an inner casing of sectional type with single-sided arrangement of impellers.
The outer casing, the base component of the pump, is a welded structure consisting of suction and discharge chambers. Support legs with stiffening ribs are welded to the outer casing, with holes for transporting the pump, as well as inlet and outlet nozzles welded for pipeline connection. The suction and discharge nozzles are directed horizontally to opposite sides of the pump. Upon customer request, it is permissible to orient the nozzles to one side. A threaded hole for steam discharge into the condenser’s airspace during pump start-up and operation is provided in the suction part of the outer pump casing.
The inner casing (removable part) consists of the following main parts: rotor, end-face mechanical seal, upper thrust bearing, delivery casing, sections with installed guide vanes, cover and guide apparatus, all connected with fasteners. The components of the inner casing are centered on cylindrical tapers and joined with tie rods. Seals made of heat-resistant rubber rings are provided at the joints. A mechanical seal is installed in the discharge cover, along with the support bracket for the electric motor and the housing of the thrust bearing. Two lifting bolts are provided in the discharge cover for removing the inner casing. The joint between the discharge cover and the outer casing is sealed with a ring made of heat-resistant rubber. The parting joint between the suction and discharge sections is sealed with two rings made of heat-resistant rubber.
The rotor of the pump KSV 500-150-1 is a standalone assembly consisting of a shaft, impellers, a pre-swirl wheel, a relief drum, a lower bearing bushing, sleeves, sealing elements, and fasteners. A pre-swirl wheel is installed before the impeller of the first stage to improve pump suction capacity. Components are mounted on the shaft with a sliding fit. A thermal gap is provided between the last stage impeller and the drum.
The assembled pump rotor is dynamically balanced.
The axial force of the rotor is absorbed by the relief piston (drum), which provides almost complete balancing only at nominal capacity. Deviation from nominal operating conditions creates an unbalanced force on the rotor, which can be directed up or down depending on the pump’s capacity and is absorbed by the thrust bearing.
The chamber behind the relief drum is connected to the pump inlet pipe via a relief pipe installed on the seal housing.
The mechanical seal of the pump is of the gland type with a hydroseal ring, supplied with cold condensate under pressure for sealing and preventing air suction into the pump.
End-face seals can also be installed.
The rotor is supported by two bearings:
- The lower hydrodynamic sliding bearing works in the pumped liquid and is designed to bear only radial loads. To protect against solid particles, the bearing is enclosed by a mesh;
- The upper thrust roller bearing fixes the rotor position in the pump and bears radial and residual axial loads. The thrust bearing consists of two angular contact ball bearings 46416, arranged in an X-shape and housed in a common casing. Bearing lubrication is liquid, supplied from top to bottom through a screw-threaded bushing via a special hole in the bearing housing. Oil cooling is carried out by technical water through a coil, with the spiral section immersed in an oil bath, while the straight sections pass through vertical holes in the housing.
The oil level in the bath is monitored by an oil level indicator. A space for installing a resistance thermoresistor is provided on the bearing housing for temperature control.
Rotor alignment in the stator (inner pump casing) is achieved by adjusting the bearing housing position using adjusting screws.
An asynchronous motor with a squirrel-cage rotor is used as the drive. The motor is mounted on the pump bracket and connected to it with a flexible bushing-pin coupling. Motor and pump alignment is achieved by moving the bracket with adjusting screws.
The pump designation signifies: KSV – condensate vertical; 500 – capacity in m³/h; 150 – head in meters; 1 – second modification.
