Water pump mechanical seal system ---- pressure control system in the parameters of mechanical seal, pressure, cycle speed, temperature are closely related, the increase of pv value will lead to the rise of temperature. Generally, the speed of the pump is fixed or within a certain range. From this, it can be seen that the control of environmental pressure is essential for mechanical seals.
Under the premise of meeting the technological conditions, the balanced seal can reduce the specific pressure of the sealing surface to improve the working conditions. In addition, for centrifugal pumps, the impeller can be taken to open a balance hole, impeller with back blades, installation of auxiliary impeller, back blades and auxiliary impeller combined with other methods to reduce the pressure before the shaft seal box, so as to reduce the load of shaft seal.
In order to reduce the shaft seal load, it can also use labyrinth seal, spiral seal, throttle bottom sleeve, floating sleeve and other auxiliary seals to share the load before mechanical seal (main seal). In order to ensure that the sealing surface has lubricating liquid film and a certain pressure, we can use double end mechanical seal or cascade mechanical seal. In order to control the environmental pressure of mechanical seals, the pressure control system can be selected according to the specific seal, medium properties and working conditions.
