12
●
Rotation Direction.
・
The rotation, suction and discharge directions of the Trochoid and Lunary
pumps are fixed, except for some models that offer forward and reverse
rotation. Set the rotation direction of the motor in accordance with the
rotation direction displayed on the pump nameplate.
・
The Trochoid and Lunary pumps have holes on the pump suction (negative
pressure) which are provided to release pressure for protecting the oil seal. If a
mistake is made in setting the rotation direction, the suction and discharge
positions will be switched. As a result, discharge pressure will flow through the
holes which is originally intended to release pressure. This pressure will build up
against the oil seal, causing seal break and oil may splash out.
Warning:
Be sure to set the pump rotation direction correctly. Mistakes in
rotational setting could break the oil seal and the oil may splash
out, resulting in unexpected accidents.
Motor Selection
●
Required Power for the Pump.
・
Select a motor with adequate power margin with reference to the performance
carve of the pump on the catalog.
・
The power required by the pump will vary depending on pressure, flow rate and
viscosity of the oil.
・
More power is required as the viscosity of the oil increases.
-Low winter temperatures must be taken into account when selecting a motor.
・
The single phase motors do not conform to the motor high-efficiency regulation
in USA.
Pump
Shaft
Oil Seal
Discharge
Port
Trochoid
Rotor
Suction
Port
・
As shown in the figure on the left, the oil is
discharged from the discharge port. When there is a
back pressure, the oil passes through the bearing A,
lubricates the ball bearing, and stopped by the oil
seal. When the pressure exceeds 0.03 MPa (0.3
kgf/cm
2
), however, the seal may rupture and the oil
splashes out.
・
A small hole B is provided to return the trapped oil to
the suction side. In other words, the oil trapped in
space C is always returned to S area. If the pump
rotates backwards, the suction port and discharge
port will be switched and the oil pressure goes
directly to the oil seal through the small hole B. Soon
the seal will rupture and end up with oil leakage, as
there is no oil passage to release the pressure.
Ruptured oil seal must be replaced as the lip is
damaged. Please consult us when replacing the oil
seal.
