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Hermetic - Model CAM -Multistage Canned Motor Pumps
The CAM und CAMR range of HERMETIC pumps are completely closed. They operate using the canned motor principle which removes the need for any shaft seal. The CAM and CAMR ranges have been developed especially for the refrigeration applications.
- Capacity: max. 40 m³/h
- Head: max. 180 m
- Rotating speed: 2800 to 3500 rpm
- Operating temperature: –50 °C to +30 °C
- Viscosity: max. 20 mm²/s
- Pressure rating: PN 25 and PN 40
The partial current for the cooling of the motor and for the lubricating of the bearing is taken from the last impeller on the discharge side and led through the motor space. It is led back through the sleeve shaft not to the suction side of the pump but between two impellers in a region with increased pressure. The point 3, which corresponds to the highest heating in the pressure-temperature-diagram, is sufficiently distanced from the vapour diagram, in order to avoid a boiling out inside the pump.
We recommend to protect HERMETIC pumps against any extreme flow conditions by means of two orifices. Orifice 1 (0 .) ensures the minimum flow rate required for the dissipation of the motor heat loss. Orifice 2 (0 ) ensures the minimum differential pressure in the rotor chamber needed for stabilising the hydraulic axial thrust balance and for avoiding the evaporation of the partial flow. Moreover, this orifice prevents an interruption of the flow of discharge if only a certain minimum suction head is available. Alternatively to orifice 2 (QmaK) a constant flow regulator can be installed (see page 20-22).
- Pump built in two to six stages to suit the application
- Able to pump 14 m 3 /h with a suction head of only 1,0 m
- Suitable for pumping ammonia, freons and other refrigerants
- The machines were examined by several classification companies and also have approval for use on ship