“Hy-Pack” as a response to the “mobile application” needs on the cleaning market
- Wednesday 20 February 2019
- By: BOONS FIS
- Category: Pressure boost
For a number of years Pratissoli has been offering a full range of high pressure plunger pumps with integrated motor, being the HY-PACK series. This new configuration has very many advantages compared to the traditional setup in which a flange and flexible coupling is used between the pump and motor; the configuration is much more compact, while offering significant weight and space savings. The assembly time needed for the Hypack series is also much shorter than that for a traditional setup with flange and flexible coupling.
The range of hydraulic motors offers a choice from 10 versions with a torque of up to 590 Nm. The GEAR MOTORS offer options to max. 280 bar and 2,600 rpm (rotations per minute). The PISTON motor segment offers options up to max. 340 bar and 2,600 rpm.
How do these hydraulic motors work?
Triplex plunger pumps use mechanical force in the form of rotations per minute and torques to generate a specific pressure and flow rate. With hydraulic force transmission this mechanical force is transmitted from the source (motor gearbox) to the “consumer unit” by the combined work of a hydraulic motor and a hydraulic pump. The hydraulic pump receives mechanical force from the source, and in turn supplies hydraulic force (flow and pressure) to the hydraulic motor. The motor then converts the power back into mechanical force (rpm and torque).
There are different versions expressed in cc/revs for both the GEAR and PISTON motors. For the gear motors this is determined based on the length of the ring gears and the internal and external diameter of the gear. For the piston motors it is determined by the piston diameter and the number of pistons.
How to choose the right hydraulic motor?
- What is the pump’s torque? If you don’t know, this can be easily calculated using the following formula
Nm = Q (lpm) x P (bar) x 18.22/rpm.
This is the torque generated by the water pump at the given rpm and operational pressure.
- The motor cylinder capacity.
Once we know the torque we must still find the appropriate motor. We also use a formula here:
Cylinder capacity (cc/revs) = torque (Nm) x 62.8/oil pressure (bar) x 0.85 vol. eff.
An example to demonstrate the above:
The customer has a KF36 at 150 lpm (litres per minute), at 130 bar, 1,000 rpm and availability of approximately 230 bar oil pressure.
Nm = 150 lpm x 130 bar x 18.22/1,000 rpm = 355 Nm
Cylinder capacity (cc) = 355 Nm x 62.8/230 bar x 0.85 vol. eff = 114 cc.
This means the ideal motor for this pump is a 114 cc motor!
Obviously Pratissoli has already made the calculation for you, so the catalogue includes all possible Hy-pack versions per pump type!
Ask our sales team for the Pratissoli Catalogue! They will be pleased to assist you!