Product Description

 Steam turbine diaphragm, a plate-shaped component that is installed in a steam turbine cylinder and divides the cylinder into several chambers of different pressures. Its main function is to install nozzles or static vanes and prevent interstage steam leakage. When the steam working fluid flows through the nozzle mounted on the separator, it converts the potential energy into kinetic energy, the pressure decreases, the velocity increases, and then enters the moving blades to do work. The partition is installed in a groove in the inner wall of the cylinder, which is generally divided into upper and lower halves, and straddles the shaft, which passes through its center.

Steam turbine diaphragms generally use horizontal split bearings with suspension pins to keep the diaphragm consistent with the middle of the cylinder and diaphragm sleeve when working.

he diaphragm is used to fix the static vane (nozzle) and prevent steam leakage between stages, it separates the inner part of the steam turbine into several pressure sections, so that the steam converts the potential energy into kinetic energy through the static vane grid, and the steam flow into the moving vane in the prescribed direction.
The baffle can be fixed directly in the baffle groove in the cylinder bore or in the baffle sleeve

The separator is subjected to the load generated by the differential pressure while working. Depending on the position of the flow section, the separator working in the high-pressure part is subjected to the action of high-temperature and high-pressure steam, and the separator working in the low-pressure part is subjected to the action of wet steam. In order to ensure that the separator has good economy and reliability during operation, the design must meet the following requirements:
(1) The static blade should have accurate steam direction and good aerodynamic performance and strength.
(2) The separator should have sufficient strength and rigidity.

The diaphragm bears a level of pressure difference in the turbine, and the pressure difference is sometimes quite large in the high-pressure part, so it must be guaranteed that there is sufficient strength: the gap between the separator and the impeller is generally not large, in order to prevent the diaphragm from producing excessive deflection after being stressed and causing the dynamic and static parts of the steam turbine to collide and wear, it must also ensure that it has sufficient rigidity.
(3) Good air tightness.
The middle surface of the partition plate and the matching surface with the cylinder and the matching surface of the partition plate and the partition sleeve should have good vapor tightness to prevent interstage steam leakage; The groove of the separator and the mating surface of the separator steam seal ring should also have sufficient sealing.
4) Concentric with the rotor.
The separator should not only ensure that it is well aligned with the rotor during installation, but also ensure that it can be aligned with the rotor unchanged or rarely changed after being heated and expanded during operation.
(5) The material of the partition working in the high-temperature area should have sufficient high-temperature resistance; The separator working in the wet steam area should have good resistance to water erosion.
For the condensing unit, the last few stages of the separator are generally considered because they work in the wet steam area: there is a trap on the inlet side of the outer ring, and there is a dehumidification ring on the outlet side to reduce the water erosion of the moving blades.
While ensuring high efficiency and economy, the structure and process should be simple, and the processing man-hours should be less.