Analysis of Mechanical Seal Leakage of Arc Gear Oil Pump during Trial Operation and Improvement of Stable Operation

1. Analysis of mechanical seal leakage during trial operation of gear pump

When the gear pump is running with sufficient static testing, the centrifugal force caused by rotation will greatly affect the medium inside the pump, so it is impossible for the mechanical seal leakage of the gear pump to be caused by the medium.

During the trial operation, the mechanical seal leakage of the gear pump is mostly caused by the damage of the dynamic and static ring friction pairs. The common reasons why friction pairs cannot function are as follows:

① During operation, due to various reasons, the axial force of the circular arc oil pump separates from the contact surface between the dynamic and static rings in the mechanical seal device of the gear pump, resulting in leakage of the mechanical seal device

② Excessive compression during the installation of mechanical seals leads to severe wear and scratches on the friction pair end face

③ The sealing ring of the moving ring is too tight, and the spring cannot adjust the axial floating amount of the moving ring

④ The sealing ring of the static ring is too loose, and when the dynamic ring floats axially, the static ring detaches from the static ring seat

⑤ There are granular substances in the working medium, which enter the friction pair during operation and damage the sealing end faces of the dynamic and static rings

Secondly, strengthen the stable operation and improvement of the circular arc oil pump. In practical operation, attention should be paid to the stability of the mechanical seal technology of the circular arc oil pump. However, some units and technical personnel lack the operation process and details, which hinders the smooth application of the mechanical seal technology used in the pump. This mainly includes the lack of stable operation in the flushing system and the lack of stable operation during maintenance and assembly. This unstable operation can form a prerequisite for the hidden danger of problems in the over temperature state. Therefore, the lack of stable operation in practical applications also has a significant impact on the performance of mechanical seals used in pumps

Stable operation is not a single and one-sided simple process, but a reasonable system layout. Based on the substantive research of mechanical seal operation, "operation" and "stable operation" are closely related, as follows:

① For the safe operation of the flushing system, the flushing system should be set and the flushing frequency, flushing intensity, etc. should be reasonably adjusted to ensure the normal operation of the flushing system;

② Strengthen the maintenance and assembly accuracy, mainly targeting the actual needs of pump mechanical seals, that is, assembly accuracy. Only with high assembly accuracy can it be conducive to the continuity of pump mechanical seal operation

③ Fully monitor the operation status of the mechanical seal of the circular arc oil pump. The monitoring can start from the above problems, that is, "investigate each factor one by one". If problems occur, they should be rectified in a timely manner, and relevant auxiliary systems and equipment should be used reasonably to lay an important foundation for the continuous operation of the mechanical seal for the pump