Mechanical seal system-pressure control system-

Mechanical seal system-pressure control system

　2019-04-01　　

Mechanical seal system-pressure control system:

Among the parameters of mechanical seals, pressure, peripheral speed, and temperature are closely related. The increase of pv value will inevitably lead to the increase of temperature. Generally, the rotational speed of the pump is fixed or within a certain range. It can be seen that controlling the environmental pressure is indispensable for the mechanical seal.

On the premise of meeting the technological conditions, the use of balanced seals can reduce the specific pressure of the sealing surface to improve working conditions. In addition, for centrifugal pumps, the impeller can be opened with balance holes, the impeller with back blades, the installation of auxiliary impellers, and the combination of back blades and auxiliary impellers can be used to reduce the pressure in front of the shaft seal box, thereby reducing the load on the shaft seal. In order to reduce the load of the shaft seal, secondary seals such as labyrinth seals, spiral seals, throttle bottom sleeves, and floating sleeves can also be used before the mechanical seal (primary seal) to share the load. In order to ensure that the sealing surface has a lubricating liquid film and a constant pressure, a double-end mechanical seal or a cascade mechanical seal can be used. Sand mill mechanical seal

In order to control the environmental pressure of the mechanical seal, the pressure control system can be selected according to the specific seal, medium properties and working conditions, as shown in Table 6-4.

Table 6-4 Various pressure control systems

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The basic device of the mechanical seal system is the pipe 　　 mechanical seal system-temperature control system overview