A steam turbine diaphragm overhaul support device

Abstract

The present invention belongs to the technical field of mechanical equipment maintenance, and particularly relates to a maintenance support device for a steam turbine diaphragm. The present invention includes a vertical plate, fixing screws, reinforcing rib plates, square tubes, PP plates, stainless steel checker plates, lifting lug holes, angle irons, and support plates. The square tubes and angle irons are welded to form a bottom foundation frame, and the stainless steel checker plates are fixed to the upper surface of the bottom foundation frame by welding. The vertical plate, reinforcing rib plates, and support plates are connected to the foundation frame by welding to form a support part. Threaded through holes are processed on the vertical plate, and the fixing screws are installed in the threaded through holes on the vertical plate. The PP plates are pasted on the top surface of the support plates, and lifting lug holes are processed on the square tubes. The structure of the present invention is simple, the operation is simple, and the maintenance is convenient. After the upper half diaphragm sleeve is lifted out, it can be directly placed on the diaphragm rack without being turned over, improving the lifting efficiency and reducing the lifting risk.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical equipment maintenance, and particularly relates to a maintenance support device for a steam turbine diaphragm. Background Art

[0002] A steam turbine, also known as a steam turbine engine, is a rotary steam power device. High-temperature and high-pressure steam passes through a fixed nozzle to become an accelerated air flow and then jets onto the blades, causing the rotor equipped with the blades to rotate and do work externally at the same time. Steam turbines are widely used and are the main equipment in modern thermal power plants, nuclear power plants, biomass power generation, etc.

[0003] A certain type of steam turbine is a single-shaft, four-cylinder, six-exhaust, reheating condensing type, with an output of 1,127,000 kW (before capacity increase) / 1,176,000 kW (after capacity increase), a rotational speed of 1,500 revolutions per minute, a frequency of 50 Hz, and is equipped with three low-pressure rotors and one high-pressure rotor with 10 stages in both forward and reverse directions. The single weight of the 1# low-pressure rotor is 164T, the single weight of the 2# low-pressure rotor is 179T, the single weight of the 3# low-pressure rotor is 182T, and the single weight of the high-pressure rotor is 75T. The diameter of the last-stage blade of the low-pressure rotor is 5,550 mm, and the diameter of the last-stage blade of the high-pressure rotor is 2,242.6 mm.

[0004] This type of steam turbine has the advantages of good starting performance, high efficiency, simple operation, and safe operation, so it is widely used in the industries of thermal power generation, nuclear power generation, and biomass power generation, and has good operation performance.

[0005] The diaphragm is a key component of the most basic working unit that completes energy conversion in the steam turbine flow path, and is composed of stationary blades, an outer ring, and an inner ring. Due to the basic characteristics of low steam parameters and large volume flow rate in the low-pressure cylinder of the steam turbine in a nuclear power unit, the diaphragm sleeve is large in size and heavy in mass. Taking this type of steam turbine as an example, the upper half of its low-pressure steam chamber weighs about 15 tons, with dimensions of approximately 1388*4858*2429 mm, and the upper half of the last-stage diaphragm of the low-pressure section weighs about 10.2 tons, with dimensions of approximately 360*5024*2512 mm. Therefore, there are relatively large industrial safety risks during maintenance hoisting, and it occupies a large amount of maintenance space when placed flat. The 1st - 5th stage diaphragms are combined into one component, and its horizontal middle split surface is a plane; the 6th and 7th stage diaphragms are combined into one component, and its horizontal middle split surface is composed of two planes, a high plane and a low plane; the 8th, 9th, and 10th stage diaphragms are each a separate component, and their horizontal middle split surfaces are each composed of two planes, a high plane and a low plane. Grooves are opened along the circumferential direction in the inner circle of each stage of the diaphragm, and the gland blocks are installed in the grooves by sliding in from the middle split surface. The gland blocks are in the shape of an arc segment, and a circle of gland is composed of several gland blocks. Summary of the Invention

[0006] The object of the present invention is to provide a turbine diaphragm maintenance support device in view of the problems that the diaphragm sleeve of the steam turbine of the nuclear power unit is large in size and heavy in mass, there are great industrial safety risks during maintenance hoisting, and it occupies a large amount of maintenance space when placed flat.

[0007] The technical solution adopted by the present invention:

[0008] A turbine diaphragm maintenance support device includes a support device for the upper diaphragms of low-pressure stages 1-7. The upper diaphragms of stages 6 and 7 are placed in the left empty space, and the upper diaphragms of stages 1 to 5 are placed in the right empty space; a support device for the upper diaphragms of low-pressure stages 8-10. The upper diaphragm of stage 9 is placed in the left empty space, the upper diaphragm of stage 8 is placed in the middle empty space, and the upper diaphragm of stage 10 is placed in the right empty space; a support device for the lower diaphragms of low-pressure stages 1-7. The lower diaphragms of stages 6 and 7 are placed in the left empty space, and the lower diaphragms of stages 1 to 5 are placed in the right empty space; a support device for the lower diaphragms of low-pressure stages 8-10. The lower diaphragm of stage 9 is placed in the left empty space, the lower diaphragm of stage 8 is placed in the middle empty space, and the lower diaphragm of stage 10 is placed in the right empty space.

[0009] The support device for the upper diaphragms of low-pressure stages 1-7, the support device for the upper diaphragms of low-pressure stages 8-10, the support device for the lower diaphragms of low-pressure stages 1-7, and the support device for the lower diaphragms of low-pressure stages 8-10 all include vertical plates, fixing screws, reinforcing rib plates, square tubes, PP plates, stainless steel checkered plates, lifting lug holes, angle irons, and support plates.

[0010] The square tubes and angle irons are welded to form a bottom basic frame. The stainless steel checkered plate is fixed on the upper surface of the bottom basic frame by welding. The vertical plates, reinforcing rib plates, and support plates are connected to the basic frame by welding to form a support part; threaded through holes are machined on the vertical plates, and the fixing screws are installed in the threaded through holes on the vertical plates. The PP plate is pasted on the top surface of the support plate, and lifting lug holes are machined on the square tubes.

[0011] The distance between adjacent vertical plates is slightly larger than the axial thickness of the corresponding diaphragm component, and the height of the vertical plate is greater than the center-of-gravity height of the lower diaphragm.

[0012] The support plate is used to support the diaphragm component. Among them, the support surface for the placement position of the diaphragm components of stages 1-5 is a plane; the support surfaces for the placement positions of the diaphragm components of stages 6 and 7 are at different levels, and the height difference is equal to the height difference between the high and low planes of the diaphragm mid-plane.

[0013] After the diaphragm is placed, the contact area between the mid-plane and the support plate is greater than 90%.

[0014] A gap allowing one person to pass through is set, and the minimum ground clearance of the upper diaphragm mid-plane is greater than the maximum arc length of the gland block.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. The partition overhaul support device has a simple structure, is easy to operate, and is convenient to maintain;

[0017] 2. The partition overhaul support device is welded with high-strength steel, has high strength, no risk of deformation, and excellent safety performance;

[0018] 3. When the partition overhaul support device is in use, after the upper half partition sleeve is hoisted out, it can be directly placed on the partition rack without turning over, improving the hoisting efficiency and reducing the hoisting risk;

[0019] 4. When the partition sleeve is placed at any position of the partition overhaul support device, the partition rack can be ensured to be stable without tilting or toppling;

[0020] 5. The partition overhaul support device has enough space for disassembling and assembling the gland packing blocks and cleaning, grinding and inspecting the surface of the partition sleeve, has good human-machine interaction performance, and improves the overhaul efficiency;

[0021] 6. The partition overhaul support device has a large contact area with the ground, ensuring that it still meets the bearing requirements of the steam turbine platform after being fully loaded, and at the same time avoiding damage to the ground of the steam turbine platform;

[0022] 7. The partition overhaul support device has a compact structure, small volume and floor area while ensuring sufficient strength and safety margin. Description of the Drawings

[0023] Figure 1 is the front view of the upper partition support device for low-pressure stages 1-7

[0024] Figure 2 is the top view of the upper partition support device for low-pressure stages 1-7

[0025] Figure 3 is the front view of the upper partition support device for low-pressure stages 8-10

[0026] Figure 4 is the top view of the upper partition support device for low-pressure stages 8-10

[0027] Figure 5 is the front view of the lower partition support device for low-pressure stages 1-7

[0028] Figure 6 is the top view of the lower partition support device for low-pressure stages 1-7

[0029] Figure 7 is the front view of the lower partition support device for low-pressure stages 8-10

[0030] Figure 8 is the top view of the lower partition support device for low-pressure stages 8-10

[0031] Figure 9It is the sectional view of the lower diaphragm support device B at low pressure levels 8 - 10

[0032] Among them: 1 - vertical plate; 2 - fixing screw; 3 - reinforcing rib plate; 4 - square tube; 5 - PP plate; 6 - stainless steel checkered plate; 7 - lifting lug hole; 8 - angle iron; 9 - support plate. Specific implementation manner

[0033] To enable those skilled in the art to better understand the technical solution of the present invention, a steam turbine diaphragm overhaul support device provided by the present invention will be described in detail below with reference to the accompanying drawings.

[0034] The present invention provides a steam turbine diaphragm overhaul support device, including the upper diaphragm support device for low pressure levels 1 - 7 as shown in Figure 1 and as shown in Figure 2 The upper diaphragms of levels 6 and 7 are placed in the left neutral position, and the upper diaphragms of levels 1 to 5 are placed in the right neutral position; as shown in Figure 3 and Figure 4 The upper diaphragm support device for low pressure levels 8 - 10 as shown, the upper diaphragm of level 9 is placed in the left neutral position, the upper diaphragm of level 8 is placed in the middle neutral position, and the upper diaphragm of level 10 is placed in the right neutral position; as shown in Figure 5 and Figure 6 The lower diaphragm support device for low pressure levels 1 - 7 as shown, the lower diaphragms of levels 6 and 7 are placed in the left neutral position, and the lower diaphragms of levels 1 to 5 are placed in the right neutral position; as shown in Figure 7 and Figure 8 The lower diaphragm support device for low pressure levels 8 - 10 as shown, the lower diaphragm of level 9 is placed in the left neutral position, the lower diaphragm of level 8 is placed in the middle neutral position, and the lower diaphragm of level 10 is placed in the right neutral position.

[0035] As shown in Figure 1 and Figure 2 The upper diaphragm support device for low pressure levels 1 - 7 includes a vertical plate 1, a fixing screw 2, a reinforcing rib plate 3, a square tube 4, a PP plate 5, a stainless steel checkered plate 6, a lifting lug hole 7, an angle iron 8, and a support plate 9.

[0036] The square tube 4 and the angle iron 8 are welded to form the bottom foundation frame. The stainless steel pattern plate 6 is fixed to the upper surface of the bottom foundation frame by welding. The vertical plate 1, the reinforcing rib plate 3, and the support plate 9 are connected to the foundation frame by welding to form the support part. Threaded through holes are machined on the vertical plate 1, and the fixing screws 2 are installed in the threaded through holes on the vertical plate 1. The PP plate 5 is pasted on the top surface of the support plate 9. Lifting lugs are machined on the square tube 4. The distance between the two vertical plates 1 on both sides of each support position is slightly larger than the axial thickness of the corresponding partition component. The radial distance of each support device is equal to the diameter of the corresponding partition component. The support surface for placing the 1st - 5th stage partition components is a plane; the support surfaces for placing the 6th and 7th stage partition components are staggered in height, and the height difference is equal to the height difference between the high and low planes of the mid - dividing plane of the partition. After the partition is placed, the contact area between the mid - dividing plane and the support device is greater than 90%. The gap between adjacent components allows a person to pass through, meeting the work needs of maintenance personnel to clean the partition; the minimum ground clearance of the mid - dividing plane of the upper partition is greater than the maximum arc length of the gland segment, facilitating the disassembly of the gland segment by maintenance personnel without hoisting.

[0037] As Figure 9 shown, the low - pressure lower partition is placed on the support plate 9. The support plate 9 and the reinforcing rib plate 3 are connected to the vertical plate 1 by welding. The support plate 9 is tangent to the back arc of the lower partition at the contact position, providing radial support for the lower partition. The PP plate 5 is pasted on the top surface of the support plate 9 and contacts the lower partition to protect the contact surface. The height of the vertical plate 1 is greater than the center - of - gravity height of the lower partition, which can prevent the partition from tipping over.

[0038] The present invention is implemented as follows:

[0039] First, after the bolts at the mid - dividing plane of the low - pressure diaphragm sleeve are disassembled, the low - pressure upper partition is lifted out of the low - pressure cylinder and placed at the corresponding position of the corresponding low - pressure upper partition maintenance support device. Then, the fixing screws 2 are tightened to clamp and fix the upper partition. Secondly, the low - pressure lower partition is lifted out of the low - pressure cylinder and placed at the corresponding position of the corresponding low - pressure lower partition maintenance support device. Then, the fixing screws 2 are tightened to clamp and fix the lower partition. After the maintenance work is completed, the fixing screws 2 are released, and the low - pressure lower partition and the upper partition are hoisted back into the low - pressure cylinder in sequence.

[0040] It can be understood that the above embodiments are only used to illustrate the principle of the present invention by way of exemplary embodiments, but the present invention is not limited to the above embodiments. Within the scope of professional knowledge possessed by those of ordinary skill in the art, without departing from the spirit and essence of the present invention, the present invention can be modified or equivalently substituted. However, the technical solutions and their improvements that do not depart from the scope of the present invention should all be covered within the scope of the claims of the present invention.

Claims

1. A maintenance support device for a steam turbine diaphragm, characterized in that: It includes the upper diaphragm support devices for the low-pressure stages 1-7, where the upper diaphragms of stages 6 and 7 are placed in the left clearance, and the upper diaphragms of stages 1 to 5 are placed in the right clearance; the upper diaphragm support devices for the low-pressure stages 8-10, where the upper diaphragm of stage 9 is placed in the left clearance, the upper diaphragm of stage 8 is placed in the middle clearance, and the upper diaphragm of stage 10 is placed in the right clearance; the lower diaphragm support devices for the low-pressure stages 1-7, where the lower diaphragms of stages 6 and 7 are placed in the left clearance, and the lower diaphragms of stages 1 to 5 are placed in the right clearance; the lower diaphragm support devices for the low-pressure stages 8-10, where the lower diaphragm of stage 9 is placed in the left clearance, the lower diaphragm of stage 8 is placed in the middle clearance, and the lower diaphragm of stage 10 is placed in the right clearance; the upper diaphragm support devices for the low-pressure stages 1-7, the upper diaphragm support devices for the low-pressure stages 8-10, the lower diaphragm support devices for the low-pressure stages 1-7, and the lower diaphragm support devices for the low-pressure stages 8-10 all include vertical plates, fixing screws, reinforcing rib plates, square tubes, PP plates, stainless steel checkered plates, lifting lug holes, angle irons, and support plates; the square tubes and angle irons are welded to form the bottom basic frame, the stainless steel checkered plate is welded and fixed on the upper surface of the bottom basic frame, the vertical plates, reinforcing rib plates, and support plates are connected to the basic frame by welding to form the support part; threaded through holes are machined on the vertical plates, and the fixing screws are installed in the threaded through holes on the vertical plates, the PP plate is pasted on the top surface of the support plate, and lifting lug holes are machined on the square tubes; the distance between adjacent vertical plates is slightly larger than the axial thickness of the corresponding diaphragm component, and the height of the vertical plate is greater than the center of gravity height of the lower diaphragm; the support plate is used to support the diaphragm component, among which, the support surface for the placement position of the upper diaphragm components of stages 1-5 is a plane; the support surfaces for the placement positions of the upper diaphragm components of stages 6 and 7 are at different levels, and the height difference is equal to the height difference between the high and low planes of the mid-plane of the diaphragm.

2. The overhaul support device for a steam turbine diaphragm according to claim 1, characterized in that: After the diaphragm is placed, the contact area between the mid-plane and the support plate is greater than 90%.

3. The overhaul support device for a steam turbine diaphragm according to claim 1, characterized in that: A clearance allowing one person to pass through is provided between adjacent components, and the minimum ground clearance of the mid-plane of the upper diaphragm is greater than the maximum arc length of the gland block.

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