The LB refrigeration lubricating oil pump is a gear pump specially designed for refrigeration equipment. It is used to transfer lubricating oil and similar oil media that do not contain solid particles or impurities.
The pump is suitable for mechanical oil, turbine oil, and other lubricating media with viscosity not higher than 200°E, approximately 1500 mPa·s, and temperature not higher than 120°C. It is also described as suitable for non-corrosive lubricating oil or similar liquids without solid particles or fibers, with temperature not higher than 80°C and viscosity from 5 to 1500 cSt. Final selection should be confirmed according to the actual medium and working conditions.
During oil transfer, the LB pump can be used as a transfer pump or booster pump. It can also be used in fuel systems for delivery, pressurization, and injection service, and as a lubricating oil pump in industrial applications.
Working Principle
The LB refrigeration lubricating oil pump works through a pair of meshing gears installed inside the pump body. The two end faces of the gears are sealed by the front and rear covers, dividing the pump body into two separate chambers: the suction chamber and the discharge chamber.
When the gears rotate, the gear teeth separate in the suction chamber, causing the chamber volume to increase and forming a partial vacuum. Under atmospheric pressure, oil from the tank enters the suction chamber through the oil pipe and pump housing. The oil trapped between the gear teeth is then carried along the inner wall of the pump housing toward the discharge chamber. In the discharge chamber, the gear teeth mesh again, reducing the volume and squeezing the oil out into the outlet pipeline. Continuous gear rotation creates continuous suction and discharge.
Installation Notes
Before installation, check whether the pump was damaged during transportation, whether the motor is damp, and whether the dust covers on the inlet and outlet have fallen off or allowed foreign matter to enter.
Clean the inner wall of the pipeline before installation to prevent welding slag, chips, or other debris from entering the pump.
Check all pipeline connections. Air leakage or liquid leakage should not be present, as this may cause pump noise or unstable operation.
A metal filter screen should be installed at the suction inlet to prevent particles, debris, and other contaminants from entering the pump.
Pre-Startup Checks
Before startup, check whether all fasteners of the gear pump unit are secure.
Confirm that the driving shaft rotates flexibly.
Make sure the inlet and outlet pipeline valves are open.
The pump rotation direction should be clockwise when viewed from the shaft extension end.
Operation & Maintenance
If abnormal noise or excessive temperature rise occurs during operation, stop the pump immediately and inspect it.
Check the pump regularly to identify and eliminate faults in time, helping maintain normal oil pump operation.
When the gear pump unit is stopped, cut off the power supply and close the inlet and outlet pipeline valves.
Features & Advantages
- Designed for Refrigeration Equipment: Specially developed for refrigeration machinery lubrication oil service.
- Clean Lubricating Oil Transfer: Suitable for lubricating oil, mechanical oil, turbine oil, and similar oil media without solid impurities.
- Compact Structure: Easy to install, use, and maintain.
- Double Circular Arc Gears: Supports stable working performance, low pressure fluctuation, and low noise.
- Reliable Operation: Designed for efficient oil transfer and long service life under suitable operating conditions.
- Multiple Oil System Uses: Can serve as a transfer pump, booster pump, fuel pump, or industrial lubrication oil pump.
Typical Applications
- Refrigeration machinery lubrication systems
- Mechanical oil transfer systems
- Turbine oil transfer systems
- Lubricating oil circulation systems
- Oil transfer and pressure boosting systems
- Fuel delivery, pressurization, and injection systems