Method of thermal moving for front bearing housing and cylinder of steam turbine

FIELD: heat-power engineering.

SUBSTANCE: invention is attributed to heat-power engineering and can be used at power plants during steam turbines operation. Thermal expansion of cylinder is performed from anchor point located on the lug of cylinder exhaust part and formed by intersection of horizontal longitudinal and lateral dowels axes, and axial position of cylinder is fixed by longitudinal horizontal and vertical dowels. Additional anchor point in the form of intersecting of horizontal longitudinal and lateral dowels axes is created in the front bearing housing, front lugs of cylinder are rested on supports not connected with front bearing housing, and as a result thermal moving of front bearing housing and cylinder is executed.

EFFECT: providing of reliable thermal moving of front bearing housing and cylinder of steam turbine.

1 dwg

 

The invention relates to a power system and can be used in power plants during operation of steam turbines.

Known method of sharing the heat movement of the housing front bearing and cylinder of a steam turbine, whereby their movement relative to the Foundation carried out from ispunct, formed by a system of transverse and vertical dowels with the placement of the transverse dowels in condensing turbine on the exhaust side or under a separately installed rear bearing in the turbine back-pressure. In this case, thermal movement along the axis of the turbine provide a flexible sheet support located under the housing front bearing or under the feet of the turbine and the vertical key, located in the exhaust pipe or flexible support and longitudinal dowels, placed under a separate bearing housing (see, for example, a Steam turbine low-power KTP. M, Energoatomizdat, 1987, p.10-13).

This method combined thermal movement of the housing front bearing and cylinder steam turbine has the following disadvantages:

1. The impossibility of perception flexible support thermal displacements of the turbine cylinder in the transverse direction. To exclude the effects of these movements in the upper part of the sheet of support for paws cylinder engaged the t cross dowels. However, when the spread sheet support behind the transverse thermal motion of the cylinder is biting the feather key groove of the legs and cross dowels flexible support that can lead to misalignment of the turbine in the lateral direction.

2. When installing flexible sheet support under the housing front bearing is possible misalignment of the turbine cylinder in the vertical direction due to the difference of thermal displacement in the vertical direction of the support body front bearing and the exhaust side of the cylinder of the turbine.

There is also known a method of sharing thermal expansion of the housing front bearing and cylinder turbine, whereby their movement exercise from fixpunkt located at the pole of the exhaust part and formed by the intersection of the longitudinal and transverse axes of pins, and transmit the movement of the cylinder on the housing front bearing two feet in front of the cylinder through the cross pins rigidly mounted on the supporting pads made in the housing front bearing (see, for example, AddRule, Bevlogen. Cogeneration steam turbine and turbine installations. M., Publishing house of MPEI. 2002, s).

This method is the closest to the claimed, but has the following disadvantages:

1. The force from the cylinder is passed through the legs and pushing the housing front bearing is, applied to the surface of the transverse dowels that can create the tipping point relative to the surface of the sliding housing front bearing, lead to the bite of metal on the sliding surface and the termination in the result of its thermal movement, the emergence of catching rotor outside of the cylinder, vibration, and torsion bolt Foundation.

2. Uneven fields cylinder temperatures can lead to different amount of thermal displacement of the clutches of the cylinder, the biting surface of the transverse pins, turn the cylinder barrel for sliding surfaces, biting on longitudinal dowels, the termination of the heat movement of the housing front bearing, the emergence of catching rotor outside of the cylinder, vibration, and torsion bolt Foundation.

The task of the invention is to provide a reliable thermal movement of the housing front bearing and cylinder of a steam turbine, whereby thermal expansion of the cylinder carried by fixpunkt located at the pole of the exhaust side of the cylinder and formed by the intersection of the axes of the horizontal longitudinal and transverse dowels, and the axial position of the cylinder is fixed longitudinal horizontal and vertical dowels.

This task is achieved in that the housing front bearing create additional fixpunkt in the form of intersection of the axes of the horizontal longitudinal and transverse dowels, the front paws of the cylinder based on hours, not connected with a housing front bearing, and as a result of this exercise independent thermal movement of the body front bearing and cylinder.

The drawing shows a schematic diagram of the heat movement of the housing front bearing and cylinder steam turbine to implement this method.

The steam turbine includes a housing front bearing 1, the cylinder 2 exhaust part 3, interconnected longitudinal vertical key 4, fixpunkt 5, formed by the intersection of the axis 6 horizontal longitudinal pins 7, 8 horizontal axis transverse pins 9 located in the plane of the slide 10 of the cylinder 2 on the support 11, the front legs 12 of the cylinder 2, resting on the rack 13, not connected with a housing front bearing 1, further fixpunkt 14 formed by the intersection of the axis 6 horizontal longitudinal pins 15 with the axis 16 of the horizontal transverse pins 17, which are located in the plane of the slide 18 of the housing front bearing 1 on a support 19.

The method is as follows.

The heat transfer cylinder 2 steam turbines operate from fixpunkt 5 along the plane of the slide 10 and the front legs 12 and the racks 13, not connected with the housing front bearing 1, and thermal movement of the body front bearing 1 is syshestvyut from additional fixpunkt 14 along the plane of the slide 18. The axial position of the cylinder 2 is fixed a horizontal longitudinal pins 7, 15 and vertical key 4.

In the bearing of the front legs 12 to 13 hours at an uneven field temperature of the cylinder 2 and therefore different sizes movements of the front legs 12, the biting surface of the transverse pins 9, the reversal of the roll body 2 prevents transmission of force from the cylinder 2 on the housing front bearing 1, pushing, and create a tipping point regarding the sliding surface 10 in the application of forces to the surface of the transverse pins 9 and termination of the heat transfer cylinder 2.

In addition, to prevent the possibility of damaging the rotor outside of the cylinder 2, its vibration and torsion bolt Foundation.

Due to the presence of additional fixpunkt 14 prevents perception of effort on the part of the cylinder 2, pushing housing front bearing 1, create a tipping point, drafts metal and termination as a result of this heat movement of the housing front bearing.

The way the heat movement of the housing front bearing and cylinder of a steam turbine, whereby thermal expansion of the cylinder carried by fixpunkt located at the pole of the exhaust side of the cylinder and obrazovan the th intersection of the axes of the horizontal longitudinal and transverse dowels, the axial position of the cylinder is fixed longitudinal horizontal and vertical dowels, characterized in that in the housing front bearing create additional fixpunkt in the form of intersection of the axes of the horizontal longitudinal and transverse dowels, the front paws of the cylinder based on hours, not connected with a housing front bearing, and as a result of this exercise independent thermal movement of the body front bearing and cylinder.



 

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