Supercritical steam turbine diaphragm adjustable tooling

Abstract

Supercritical steam turbine diaphragm adjustable tool, including bottom plate, quick change pressure plate, bottom plate is a horizontal steel plate, quick change pressure plate passes through pressure plate bolt, pressure plate nut and fixes steam turbine diaphragm on bottom plate, three adjustable devices for being fixed to three points of pressure plate are equipped on bottom plate.Adjustable device includes bushing, bushing is fixed on bottom plate through lock bolt, bushing is equipped with adjusting nut, bushing and adjusting nut are connected through thread, adjusting nut is fixed in bushing through lock nut, both ends of adjusting nut are fixed with rolling bearing and outer ring of second rolling bearing respectively, inner ring of rolling bearing and second rolling bearing is fixed with mandrel, round nut is fixed between adjusting nut and mandrel, lower end of mandrel is fixed with base through thread, flat bearing is equipped between mandrel and base.

Description

Technical Field

[0001] This utility model relates to the field of turbine partition technology, to the preparation of supercritical turbine partitions, and to adjustable tooling for supercritical turbine partitions. Background Technology

[0002] Supercritical steam turbine technology is a highly efficient power generation technology in the thermal power field. Its core lies in utilizing supercritical steam (pressure > 22.1 MPa, temperature > 374℃) to improve thermal efficiency and reduce energy consumption and emissions. The turbine diaphragm divides the cylinder into multiple independent pressure chambers, ensuring steam flows along a preset pressure and temperature path, optimizing thermal efficiency. Simultaneously, nozzles or stationary blades installed on the diaphragm guide the steam to change direction and accelerate, realizing the conversion of potential energy into kinetic energy. The turbine diaphragm also provides mechanical support for the nozzles, blades, and cylinder, maintaining internal structural stability and uniformly bearing the static load generated by the steam pressure difference and the thermal stress under high temperature and high pressure conditions. The diaphragm physically separates the rotor's working stages, ensuring that the steam expands and performs work stage by stage.

[0003] In supercritical steam turbines, there is a type of diaphragm that is a key structural component in the flow passage of the turbine. Its function is consistent throughout the entire process of steam capacity conversion, and it directly affects the unit's efficiency and stability.

[0004] Due to the large diameter and volume of supercritical steam turbines, turbine diaphragms are typically composed of upper and lower halves. The mating surface (the split surface) between the upper and lower diaphragms is a critical interface in the horizontal structure, directly affecting the unit's sealing performance, installation accuracy, and operational reliability. The split surface requires extremely high machining precision: flatness ≤0.02mm, surface roughness Ra ≤1.6μm, and perpendicularity between the split surface and the diaphragm plane ≤0.02mm. During the machining of the turbine diaphragm split surface, unstable clamping or clamping deviations can significantly impact its accuracy. Furthermore, the stringent requirements for the split surface result in a longer clamping and adjustment time for the diaphragm. Utility Model Content

[0005] To address the aforementioned problems, the purpose of this invention is to design an adjustable fixture for supercritical turbine partitions. When machining the partition's split surface on a boring and milling machine, the fixture allows for height adjustment and rapid clamping, thereby reducing the difficulty and improving the clamping efficiency of the turbine partitions.

[0006] The technical solution proposed by this utility model is an adjustable fixture for a supercritical steam turbine diaphragm, including a base plate and a quick-change pressure plate 1. The base plate is a horizontal steel plate. The quick-change pressure plate 1 fixes the steam turbine diaphragm to the base plate 4 by pressure plate bolts 2 and pressure plate nuts 3. The base plate 4 is provided with three points for evenly fixing the diaphragm to the pressure plate 1. The adjustable device includes a bushing 11, which is fixed to the base plate 4 by set bolts 10.

[0007] The bushing 11 is provided with an adjusting nut 8, and the bushing 11 and the adjusting nut 8 are connected by threads;

[0008] The adjusting nut is fixed inside the bushing 11 by the locking nut 9.

[0009] The adjusting nut 8 is provided with rolling bearings 7 and rolling bearings 12 at both ends, and the rolling bearings 7 and rolling bearings 12 are fixed between the adjusting nut 8 and the spindle 5 by round nuts 6.

[0010] The other end of the mandrel 5 is fixed to the base 14 by threads, and a plane bearing 13 is provided between the mandrel 5 and the base 14.

[0011] The three points on pressure plate 1 correspond to the three points around the diaphragm of the supercritical steam turbine.

[0012] Beneficial effects: The turbine diaphragm consists of upper and lower halves. The mating surface between the upper and lower halves is the split surface. The split surface includes both the surface perpendicular to the tooling base plate 4 and the inclined surface. Therefore, when machining the split surface on a boring and milling machine, the accuracy of the horizontal plane adjustment is required to be high. If the adjustment error is large, after machining the split surface, when the upper and lower halves are joined together, the gap between the mating surfaces will exceed the tolerance, or the upper and lower halves will not be perpendicular. (See figure for schematic diagram of the split surface). When machining the split surface of the diaphragm on a boring and milling machine, the height adjustment and the accurate and efficient adjustment of the horizontal plane of the workpiece are achieved through tooling, and quick clamping reduces the clamping difficulty of the turbine diaphragm and improves the clamping efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram showing the usage state of this utility model;

[0014] Figure 2 This is a top view of the present invention;

[0015] Figure 3 This is a detailed structural drawing of the adjustable device of this utility model.

[0016] Figure 4 For the turbine partition plate of the workpiece processed by this utility model, the mid-section 15-1 is given. Detailed Implementation

[0017] The technical solution of this embodiment will be clearly and completely described below with reference to the accompanying drawings:

[0018] 1. Place the turbine partition plate on the base plate 4. Figure 1 , Figure 2 It is fixed by three quick-pressing plates 1, pressure plate bolts, and pressure plate nuts.

[0019] The adjustable fixture for the supercritical turbine diaphragm 15 includes a quick-change pressure plate 1. The quick-change pressure plate 1 fixes the turbine diaphragm 15 to the base plate 4 by pressure plate bolts 2 and pressure plate nuts 3. The base plate 4 is provided with three adjustable devices.

[0020] 2. The adjusting nut 8 and the bushing 11 are threaded together. Rotating counterclockwise loosens the locking nut 9. Figure 3 The machine tool marks the upper surface of the turbine partition plate; according to the marking value, the height of the base plate 4 is adjusted by radially rotating the adjusting nut 8. When the turbine partition plate is leveled and adjusted, the locking nut 9 is tightened clockwise.

[0021] The adjustable device includes a bushing 11, which is fixed to the base plate 4 by a set bolt 10; an adjusting nut 8 is provided inside the bushing 11, and the bushing 11 and the adjusting nut 8 are connected by threads; the adjusting nut is fixed inside the bushing 11 by a locking nut 9.

[0022] The two ends of the adjusting nut 8 are respectively fixed to the outer rings of the rolling bearing 7 and the second rolling bearing 12. The inner rings of the rolling bearing 7 and the second rolling bearing 12 are fixed to the spindle. A round nut 6 is provided to fix between the adjusting nut 8 and the spindle 5. The lower end of the spindle 5 is fixed to the base 14 by threads. A plane bearing 13 is provided between the spindle 5 and the base 14.

[0023] 3. The aforementioned planar bearing 13 can withstand a large axial load. Figure 3 It can withstand a turbine partition weighing up to 2000kg.

[0024] 4. The machine tool is used to level the split surface of the turbine diaphragm. The surface of the turbine diaphragm is machined by a CNC vertical lathe. The tooling and fixtures in this application are used to machine the split surface on a boring machine and a milling machine. The split surface is generally provided with steps.

[0025] 5. Precision milling of the split surface of the turbine diaphragm.

[0026] Finally, it should be noted that the above content is only used to illustrate the technical solution of this utility model, and is not intended to limit the scope of protection of this utility model. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model do not depart from the essence and scope of the technical solution of this utility model.

Claims

1. An adjustable diaphragm fixture for a supercritical steam turbine, characterized in that, It includes a base plate and a quick-change pressure plate. The base plate is a horizontal steel plate. The quick-change pressure plate fixes the turbine partition to the base plate by pressure plate bolts and pressure plate nuts. The base plate is provided with three adjustable devices for evenly fixing the pressure plate at three points.

2. The adjustable tooling for supercritical steam turbine diaphragms according to claim 1, characterized in that, The adjustable device includes a bushing, which is fixed to the base plate by a set bolt; an adjusting nut is provided inside the bushing, and the bushing and the adjusting nut are connected by threads; the adjusting nut is fixed inside the bushing by a locking nut; the outer rings of a rolling bearing and a second rolling bearing are respectively fixed at both ends of the adjusting nut, and a spindle is fixed at the inner rings of the rolling bearing and the second rolling bearing; a round nut is provided between the adjusting nut and the spindle; the lower end of the spindle is fixed to the base by threads, and a plane bearing is provided between the spindle and the base.

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