What is a cartridge seal in a mechanical seal?

In the mechanical seal, what is the cartridge seal? The mechanical seal is also called the end seal, which is mainly used to seal the rotating shaft of pumps, compressors, hydraulic drives and other Grundfos mechanical seals. The mechanical seal is a sealing device composed of a pair of and several pairs of moving and static rings consisting of a plane friction pair. Classification of mechanical seals: According to the rotation or static of the spring element, it can be divided into: rotary internal internal flow unbalanced single end seal, referred to as rotary; static external internal flow balanced single end seal, referred to as imported mechanical seal static. Mechanical related information seals rely on one or several pairs of end faces that are perpendicular to the cartridge mechanical seal shaft for relative sliding under the action of fluid pressure and the elastic force (or magnetic force) of the compensating mechanism to keep fit and to be equipped with auxiliary sealing to achieve leakage Shaft sealing device. Composed of stationary ring (stationary ring) 1, rotating ring (moving ring) 2, elastic element 3, spring seat 4, set screw 5, rotating ring auxiliary sealing ring 6 and stationary ring auxiliary sealing ring 8 and other elements, anti-rotation pin 7 is fixed on the gland 9 to prevent the stationary ring from rotating. There are four possible channels for fluid leakage in the mechanical seal as shown in Figure 1 A and D.