4.6
Design and function
1
3
4
6
7
8
9
10
5
2
Fig. 3: Sectional drawing
1
Casing wear ring
2
Discharge nozzle
3
Discharge cover
4
Shaft
5
Bearing bracket
6
Suction nozzle
7
Impeller
8
Shaft seal
9
Bearing, pump end
10
Bearing, motor end
The pump is designed with an axial fluid inlet and a radial outlet. The hydraulic
system sits on the extended motor shaft. The shaft runs in common bearings.
The fluid enters the pump axially via a suction nozzle (6) and is accelerated outward
in a cylindrical flow by the rotating impeller (7). The flow profile of the pump casing
converts the kinetic energy of the fluid into pressure energy. The fluid is pumped to
the discharge nozzle (2), where it leaves the pump. The casing wear ring (1) prevents
any fluid from flowing back from the casing into the inlet. At the rear side of the
impeller, the shaft (4) enters the casing via the discharge cover (3). The shaft passage
through the discharge cover is sealed towards the atmosphere with a shaft seal (8).
The shaft runs in rolling element bearings (9 and 10), which are supported by a
bearing bracket (5) linked with the pump casing and/or discharge cover.
The pump is sealed by two bi-rotational mechanical seals in tandem arrangement.
A lubricant reservoir in-between the seal elements ensures cooling and lubrication of
the mechanical seals.
4.7
Scope of supply
Depending on the model, the following items are included in the scope of supply:
Stationary wet installation (type of installation S)
▪
Pump set complete with electric cables
▪
Claw with sealing material and mounting elements
▪
Lifting rope or chain
▪
Mounting bracket with mounting elements
Design
Function
Sealing
4 Description of the Pump (Set)
Amarex KRT
17 of 74
Goodnal STP ST041 Sewage Delivery (Amarex KRT Submersible Motor Pump) Vendor Manual
Q-Pulse Id VM362
Active 29/10/2013
Page 19 of 96
