End suction pump is short for single-stage end-suction centrifugal pump, also called horizontal end-suction single-stage centrifugal pump, the structural characteristics of which are water inlet at the side face and water outlet at the top.
There are two main types of end suction pumps commonly found on the market today
1. Bracket type center outlet end suction pump
Bracketed centerline outlet end suction pump with feet at the bottom of the pump casing, the outlet centerline and shaft centerline coincide, mainly used in industry and water withdrawals
Early industrial buildings were not like today’s concrete structures, where the steel top frame could not support the weight of the piping, and the piping was floor to ceiling. Commonly used pipeline roof hanger type orientation. The pump is fixed directly to the concrete base without shock absorbing facility. Bring the vertical downward force.
Used in the field of water intake, early rural water intake more with this type of pump, with diesel pulley drive. The sturdy bracket at the bottom of the pump casing resists the pull of the pulley and also bears the downward force of the outlet line.
This type of pump has a steep P-Q performance curve suitable for open systems.
In summary. This type of pump is advantageous for small to medium flow rates, open systems, or where the inlet pressure is low and the pump casing has to carry some of the downward force.
2. Stand tangential outlet end suction pump
Bracket tangent outlet end suction pump should be heating needs from the bottom of the pump casing has legs, outlet center line and shaft center line does not coincide, parallel tangent outlet
As the heating industry grows and flows tend to develop at high rates, the problems created by the original centerline outlet end suction pump are becoming more apparent. The main ones are: efficiency, vibration and casting. After the great industrial development, the amount of liquid conveyed also continues to develop to large flows, also facing the same problem.
Someone say, why not use double suction pump for high flow? Considering the space, piping layout, cost and other issues, the end suction pump still has its space to exist.
The following is a brief comparison of the two outlet forms.
Center line: liquid from the pump casing to the outlet through the S-bend discharge, easy to produce floc, impede water flow, resulting in reduced efficiency, vibration, etc. Casting is also relatively complicated.
Tangential outlet: Liquid is discharged directly from the pump casing, which makes the water discharge more smooth, avoids floc flow at the outlet, improves conveying efficiency and reduces the outlet. Vibration generation, relatively simple casting
The above comparison shows that tangential outlets are better for high flow rates.
Earlier heating piping was mostly grounded, rather than the now commonly used piping roof hanger type towards. The pump has no damping facility, it is fixed directly on the cement base, no hard connection with soft joint at the outlet, the bracket at the bottom of the pump casing can bear part of the vibration. Vertical downward force generated by the outlet line.
This type of pump has a gentle P-Q performance curve.
In summary, this type of pump is more suitable for large flow, and directly fixing the cement foundation and the pump casing need to bear part of the downward force environment.