Precautions for using gear pumps

As an important component in hydraulic systems, the correct use and maintenance of gear pumps are crucial for the stable operation of the system. The following is a detailed explanation of the precautions for using gear pumps, with a word count of around 1000 words:

1、 Inspection and preparation before startup

Check the pump and motor: Before using the gear pump, it is necessary to carefully inspect the condition of the pump and motor, including whether there is any jamming or inflexibility, whether the packing is tight, whether the components are connected, and whether the lubricating oil (grease) is appropriate. It is particularly important to note that before starting, the discharge valve and related valves on the discharge pipeline need to be opened to prevent damage to the pump or pipeline, and even burn out the electric motor.

Check coaxiality: An elastic coupling should be used between the pump drive shaft and the output shaft of the prime mover, and the coaxiality error value should not exceed the specified range to ensure the stable operation of the pump.

Check the filtration system: The filtration accuracy of the pump should be ≤ 40um, and a mesh filter with a mesh size of 150 is commonly used at the suction port. At the same time, the accuracy of the filter arranged on the system return oil path should also be ≤ 40um to prevent impurities from entering the pump body.

Check the rotation direction: The rotation direction of the pump should be consistent with the requirements in the commercial manual, that is, the positions of the inlet and outlet ports should not be confused.

Check the stability device: Before starting the equipment, it is necessary to carefully check whether there are many stability devices to determine the stability during operation.

2、 Precautions during operation

Do not close the discharge valve: The gear pump should not close the discharge valve during operation because the liquid is almost incompressible. Closing the valve can cause the pump or pipeline to be damaged, and may also burn out the motor.

Flow regulation: The flow regulation of gear pumps is mainly achieved through bypass valves, rather than by closing the discharge valve.

Monitoring operating parameters: During operation, the pressure, temperature, and flow rate of the gear pump should be monitored at all times to ensure that it operates within the normal range. At the same time, pay attention to the running sound of the pump, observe for any abnormal vibration and noise, as well as any leakage.

Maintain lubrication: The normal operation of the gear pump depends on the performance of the lubricating oil, so the cleanliness and fluidity of the lubricating oil should be checked regularly, and contaminated or aged lubricating oil should be replaced in a timely manner. At the same time, regularly inspect the oil seals, O-rings, and other sealing components of the gear pump. If wear, aging, or damage is found, they should be replaced in a timely manner.

3、 Shutdown and maintenance

No load operation: When the pump is not used for a long time or restarted, it should be operated without load for more than 10 minutes to check the working condition of the pump and avoid direct use of high loads.

Regular cleaning and inspection: Regularly clean oil tanks, filters, and pipelines to prevent impurities from entering the oil system. At the same time, regularly replace the filter element to ensure that the system's rate does not filter. In addition, it is necessary to regularly check the wear of gears and bearings, and replace them promptly if any abnormal wear is found.

Maintenance records: Establish detailed maintenance records to document each maintenance and repair, in order to track equipment history, identify potential issues in a timely manner, and develop maintenance plans.

Stability protection: When handling and installing pumps, it is necessary to wear appropriate stability protective clothing and properly secure the pump to avoid injury or damage. At the same time, the surrounding environment should be clean and stable, and debris such as dust and iron filings should be avoided from entering the oil tank.

In summary, the precautions for using gear pumps cover multiple aspects such as inspection and preparation before starting, precautions during operation, and shutdown and maintenance. Only by strictly following these precautions for operation and maintenance can the long-term stable operation and extended service life of the gear pump be determined.