What Requirements Do Mechanical Seals Have for the Seal Ring?

Mechanical seal, also known as end face seal, is defined in relevant standards as a device that prevents fluid leakage by maintaining close contact and relative sliding between at least a pair of end faces perpendicular to the axis of rotation, under the action of fluid pressure, compensation mechanism elasticity, auxiliary sealing, and the like.

Several aspects to pay attention to in preventing mechanical seals damage

Mechanical seals are important sealing components in a water pump, which are installed at the junction of the motor and the pump body to ensure that the medium does not leak during the operation of the water pump. Mechanical seals are also vulnerable parts of water pumps. If mechanical seals for water pump are damaged, not only will the efficiency of the pump be reduced, but also greater damage will be caused to the pump over time. Therefore, in the daily use of water pumps, correct maintenance of mechanical seals must be carried out to achieve good sealing effect and long service life. How to prevent mechanical seal damage? Several aspects should be noted when inspecting mechanical seals.

• Avoid leakage due to loose parts, pay attention to the heat generated by impurities entering the end face and abnormal sound during operation. For pumps that operate continuously, not only should dry friction be prevented when starting, but also during operation. Do not let the pump run dry. Automatic devices can be installed as needed to prevent pumping out. For intermittent operation of pumps, pay attention to the crystals formed by material drying or cooling after stopping the pump, and take measures such as heating or flushing when starting the pump to avoid scratching the end surface by crystal particles and affecting the sealing effect.

• Check whether the circulation protection system and instruments for flushing, cooling, and other functions are operating normally and steadily. Pay attention to the failure of the seals caused by sudden water stop or accidents caused by clogging of cooling pipes, flushing pipes, and equalizing pipes.

• The vibration and heat generated by centrifugal pumps will also affect the sealing performance, which must be observed frequently. When the bearing is damaged, it will also affect the sealing performance. Therefore, pay attention to whether the bearing is heating up and whether there are abnormal sounds during operation so that it can be repaired timely.

Mechanical seals have specific requirements for sealing ring

The sealing ring is the general term for the dynamic ring and static sealing ring, which are the main components of mechanical seals. The sealing ring determines to a large extent the performance and service life of the mechanical seal, so there are specific requirements for the sealing ring of mechanical seals.

• The sealing ring should be easy to process and manufacture.

• The installation and maintenance should be easy, and the price should be low.

• The sealing ring should have good heat resistance and shock resistance, so the material should have a higher thermal conductivity and smaller linear expansion coefficient to prevent cracking under thermal shock.

• The sealing ring should have good self-lubrication to prevent short-term dry friction during operation, which can damage the sealing end face. Therefore, the sealing ring material should have good wettability with the sealing fluid.

• The structure should be simple. The sealing ring structure should be simple and symmetrical. The whole structure is preferred, and a composite sealing ring can also be used. The spray coating structure on the sealing end face should be avoided as much as possible.

• It should have sufficient strength and stiffness. The mechanical seal should not be damaged under working conditions, and the deformation should be as small as possible so that the sealing performance can be maintained even when the working conditions fluctuate. Especially, the sealing end face should have sufficient strength and certain corrosion resistance to ensure the service life of the product.