A flexible sealing ring support device for low-pressure cylinder of steam turbine

Abstract

The present invention belongs to the technical field of steam turbine maintenance, and specifically relates to a flexible sealing ring support device for a steam turbine low-pressure cylinder. The left U-shaped frame and the right U-shaped frame are two-half symmetrical structures, which can be symmetrically unfolded or folded along the rotating axis; the flexible sealing ring is stored in the left U-shaped frame and the right U-shaped frame, and fixed with a quick latch A; the optical axis and the triangular reinforcing rod are connected by a quick clamp B; the column and the optical axis are connected by an L-shaped frame; the column and the triangular reinforcing rod are connected by a hinge structure; a rotating pin is installed after drilling a hole on the hinge frame, and the rotating pin hole seat is hinged to the hinge frame through the rotating pin, and the hinge point is located at the horizontal center line of the low-pressure cylinder of the steam turbine; the lower part of the column is inserted into the rotating pin hole seat, and then locked with a quick clamp C to form a whole; the left U-shaped frame and the right U-shaped frame can be flipped around the rotating pin to leave the vertical center line. The present invention can support, store and move the flexible sealing ring more quickly, simply and safely, avoiding the risk of damage such as being stepped on, collided, stretched and deformed.

Description

Technical Field

[0001] The invention belongs to the technical field of steam turbine maintenance, and in particular relates to a flexible sealing ring supporting device for a low-pressure cylinder of a steam turbine. Background Art

[0002] As a key and important equipment in the secondary circuit of a nuclear power plant, the steam turbine is a prime mover that converts the thermal energy of nuclear steam into mechanical energy and drives the generator to rotate. Units 1-4 of a nuclear power plant use HD1080A steam turbines. The low-pressure cylinder is a double-layer cylinder structure. A flexible sealing ring is designed between the inner and outer cylinders to absorb the free expansion of the outer cylinder relative to the inner cylinder and ensure the sealing between the inside and outside of the cylinder structure, thereby preventing external air from entering.

[0003] The flexible sealing ring is a full-circle rubber structure and cannot be disassembled by design. During the disassembly and overhaul of the low-pressure cylinder of the steam turbine, it is directly stored on both sides of the cylinder body, which poses the risk of being stepped on, collided, stretched and deformed. At the same time, during the overhaul, the flexible sealing ring needs to be moved many times due to the hoisting work of the inner cylinder, rotor and other equipment of the steam turbine. The flexible sealing ring weighs 100 kg, which is very inconvenient to move manually.

[0004] Therefore, it is urgent to design a flexible sealing ring support device for the low-pressure cylinder of a steam turbine to meet the support, movement and storage requirements of the flexible sealing ring during the maintenance of the low-pressure cylinder of the steam turbine, so as to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a flexible sealing ring support device for a steam turbine low-pressure cylinder, which is mainly used for the maintenance of the low-pressure cylinder of a HD1080A steam turbine. It can support, store and move the flexible sealing ring more quickly, simply and safely, avoid the risk of damage to the flexible sealing ring by being stepped on, collided, stretched and deformed, and meet the finished product protection needs during the overhaul of the unit.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A flexible sealing ring supporting device for a low-pressure cylinder of a steam turbine comprises a left U-shaped frame, a right U-shaped frame, a rotating shaft, an optical axis, a column and a rotatable hinged frame; the left U-shaped frame and the right U-shaped frame are two-half symmetrical structures, which can be symmetrically unfolded or folded along the rotating shaft; the flexible sealing ring is stored in the left U-shaped frame and the right U-shaped frame and fixed with a quick latch A; the optical axis and the triangular reinforcing rod are connected by a quick clamp B; the column and the optical axis are connected by an L-shaped frame; the column and the triangular reinforcing rod are connected by a hinged structure; the rotatable hinged frame is assembled into a whole by a quick clamp C, a rotating pin hole seat, a rotating pin shaft, a quick latch B and a hinge frame, the rotating pin shaft is installed after drilling a hole on the hinge frame, the rotating pin hole seat is hinged to the hinge frame through the rotating pin shaft, and the hinge point is located at the horizontal center line of the low-pressure cylinder of the steam turbine; the lower part of the column is inserted into the rotating pin hole seat, and then locked by the quick clamp C to form a whole; the left U-shaped frame and the right U-shaped frame can be flipped around the rotating pin shaft to leave the vertical center line.

[0008] The left U-shaped frame and the right U-shaped frame can be symmetrically unfolded or folded along the rotating axis and locked by the quick clamp A.

[0009] A lifting lug A is designed on the rotating shaft.

[0010] The left U-shaped frame and the right U-shaped frame are designed with lifting ears B.

[0011] The column and the optical axis are connected by an L-shaped frame and fastened by a fastener A.

[0012] The upright column and the triangular reinforcing rod are connected by a hinged structure and fastened by a fastener B.

[0013] The hinge frame is symmetrically fixed on both sides of the low-pressure cylinder of the steam turbine by bolts.

[0014] The hinge frame is formed by welding four Q235-B carbon steel plates.

[0015] The hinge frame is equipped with a quick latch B.

[0016] When the low-pressure cylinder is overhauled, the rotatable articulated frame is fixed symmetrically on both sides of the low-pressure cylinder of the turbine, and the supporting device is lifted to the corresponding position of the low-pressure cylinder using lifting equipment, and the left U-shaped frame, the right U-shaped frame, the optical axis and the column are unfolded along the rotating axis, and the column is inserted into the rotating pin hole seat, and then locked with quick clamp C to form a whole, and the support device is installed; open the quick latch A, put the flexible sealing ring into the left U-shaped frame and the right U-shaped frame, and re-lock the quick latch A. At this time, the flexible sealing ring is fixed; before the lifting operation of the low-pressure inner cylinder or rotor of the turbine begins, the rotating pin hole seat is flipped 30° around the rotating pin shaft, 1.1m away from the vertical center line. At this time, the flexible sealing ring has moved to the non-working position. Working position; when the lifting operation of the low-pressure inner cylinder or rotor of the turbine is completed, turn the rotating pin hole seat 30° around the rotating pin shaft and return to the vertical center line position. At this time, the flexible sealing ring has moved to the working position; open the quick latch A, move the flexible sealing ring out of the left U-shaped frame and the right U-shaped frame, install it on the corresponding position of the low-pressure cylinder, and re-lock the quick latch A; after all the maintenance work of the low-pressure cylinder of the turbine is completed, release the quick clamp C, pull the column out of the rotating pin hole seat, and use the lifting equipment to lift the supporting device to the storage site; fold the left U-shaped frame, the right U-shaped frame, the optical axis and the column symmetrically along the rotating axis and store them in the box; store the rotatable articulated frame in the box and transport it to the designated storage location.

[0017] The beneficial effects achieved by the present invention are:

[0018] The invention has a simple structure, and quick latches or quick clamps are used at the connection points of various components. When maintenance is required, the device can be quickly assembled and disassembled without the need for additional tools, and is easy to operate.

[0019] The articulated frame of the present invention is designed to be rotatable. In addition to the basic function of storing the flexible sealing ring, the flexible sealing ring can also be quickly moved according to maintenance requirements, and the operation is simple.

[0020] The present invention is specially designed and mechanically modeled for the size and weight of the flexible sealing ring, so as to ensure the stability of the support and movement of the flexible sealing ring, ensure that the flexible sealing ring will not be stretched during the entire process, and effectively prevent the flexible sealing ring from being deformed and damaged.

[0021] After the on-site installation, the present invention does not occupy the low-pressure cylinder maintenance space, and does not need to be removed during the entire steam turbine low-pressure cylinder maintenance period, and is only removed after the maintenance is completed. Compared with manual continuous handling of flexible sealing rings, it can effectively reduce labor intensity and shorten the unit overhaul period.

[0022] The invention is designed to be foldable, which can effectively reduce space and facilitate storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the supporting device of the present invention;

[0024] Figure 2 It is a schematic diagram of the rotatable articulated frame of the present invention;

[0025] In the figure: 1-left U-shaped frame; 2-rotating shaft; 3-lifting ear A; 4-quick clamp A; 5-right U-shaped frame; 6-lifting ear B; 7-fastener A (including bolts, flat washers, elastic washers, nuts); 8-L-shaped frame; 9-triangular reinforcement rod; 10-fastener B (including bolts, flat washers, elastic washers, nuts); 11-column; 12-quick clamp B; 13-optical axis; 14-quick latch A; 15-quick clamp C; 16-rotating pin hole seat; 17-rotating pin shaft; 18-quick latch B; 19-hinge frame; 20-bolt; 21-rotatable articulated frame. DETAILED DESCRIPTION

[0026] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1 As shown, the flexible sealing ring support device for the low-pressure cylinder of the steam turbine of the present invention comprises a left U-shaped frame 1, a right U-shaped frame 5, a rotating shaft 2, an optical axis 13, a column 11 and a rotatable hinged frame 21; the left U-shaped frame 1 and the right U-shaped frame 5 are two-half symmetrical structures, which can be symmetrically unfolded or folded along the rotating shaft 2 and locked by a quick clamp A4. A lifting lug A3 is designed on the rotating shaft 2, and a lifting lug B6 is designed on the left U-shaped frame 1 and the right U-shaped frame 5 for lifting purposes. The flexible sealing ring is stored in the left U-shaped frame 1 and the right U-shaped frame 5 and fixed with six sets of quick latches A14. The optical axis 13 and the triangular reinforcing rod 9 are connected by a quick clamp B12 to facilitate the rapid folding of the column 11. The column 11 and the optical axis 13 are connected by an L-shaped frame 8 and equipped with a fastener A7. The column 11 and the triangular reinforcing rod 9 adopt a hinged structure and are equipped with a fastener B10.

[0028] Rotatable hinge frame 21 (see Figure 2 ) is assembled into a whole by quick clamp C15, rotating pin hole seat 16, rotating pin shaft 17, quick latch B18, and hinge frame 19, and does not need to be disassembled or assembled again when used. The hinge frame 19 is symmetrically fixed on both sides of the low-pressure cylinder of the steam turbine with bolts 20. The hinge frame 19 is welded and assembled by 4 pieces of Q235-B carbon steel plates. The rotating pin shaft 17 is installed after drilling holes on the hinge frame 19. The rotating pin hole seat 16 is hinged to the hinge frame 19 through the rotating pin shaft 17, and the hinge point is located at the horizontal center line of the low-pressure cylinder of the steam turbine.

[0029] The lower part of the column 11 is inserted into the rotating pin hole seat 16, and then locked with a quick clamp C15 to form a whole. The left U-shaped frame 1 and the right U-shaped frame 5 can be turned about 30 degrees around the rotating pin shaft 17 and about 1.1m away from the vertical center line, which is convenient for the movement of the flexible sealing ring. The hinge frame 19 is equipped with a quick latch B18 for turning limit.

[0030] The present invention is specially designed according to the size of the flexible sealing ring. The size of the flexible sealing ring is DN7500, the top center is about 3750mm away from the horizontal center plane of the cylinder, the corresponding installation position of the designed device is 3220mm away from the horizontal center plane of the cylinder, the supporting device is about 530mm lower than the flexible sealing ring, and the flexible sealing ring has a certain amount of movement margin. The flexible sealing ring will not be stretched during the fixing or moving process, and its deformation can be effectively prevented.

[0031] The present invention conducts special mechanical modeling based on the importance of the flexible sealing ring. The total weight of the flexible sealing ring is 100Kg. When the low-pressure cylinder is overhauled, its lower half is fixed on the low-pressure cylinder, and its upper half needs to support a weight of about 50Kg. The weight of the supporting device, excluding the two columns, is about 100Kg, totaling 150Kg, that is, each column needs to support 75Kg. After flipping 30°, the yield stress, displacement and safety factor can safely and stably support the weight of the flexible sealing ring.

[0032] Step 1: Install the support device on the low-pressure cylinder

[0033] When the low-pressure cylinder is overhauled, the rotatable hinged frame 21 (including quick clamp C15, rotating pin hole seat 16, rotating pin shaft 17, quick latch B18, hinge frame 19) is symmetrically fixed on both sides of the low-pressure cylinder of the turbine with bolts 20. Use lifting equipment to lift the support device to the corresponding position of the low-pressure cylinder through the lifting lugs A3 and B6, and unfold the left U-shaped frame 1, the right U-shaped frame 5, the optical axis 13 and the column 11 along the rotating shaft 2, and lock them with quick clamps A4 and quick clamps B12. Insert the column 11 into the rotating pin hole seat 16, and then lock it with quick clamps C15 to form a whole, and the support device is installed.

[0034] Step 2: Fix the flexible sealing ring on the support device

[0035] Open the six quick latches A14, put the flexible sealing ring into the left U-shaped frame 1 and the right U-shaped frame 5, and re-lock the six quick latches A14. At this time, the flexible sealing ring is fixed.

[0036] Step 3: Move the flexible sealing ring according to maintenance requirements

[0037] Before the installation of the low-pressure inner cylinder or rotor of the steam turbine begins, pull out the quick latch B18 of the rotatable articulated frame 21, flip the rotating pin hole seat 16 about 30° around the rotating pin shaft 17, about 1.1m away from the vertical center line, and then reinstall the quick latch B18. At this time, the flexible sealing ring has moved to the non-working position.

[0038] When the installation of the low-pressure inner cylinder or rotor of the steam turbine is completed, pull out the quick latch B18 of the rotatable articulated frame 21, flip the rotating pin hole seat 16 about 30° around the rotating pin shaft 17, return to the vertical center line position, and then reinstall the quick latch B18. At this time, the flexible sealing ring has moved to the working position.

[0039] Step 4: Remove the flexible sealing ring from the support device

[0040] Open the six quick latches A14, remove the flexible sealing ring from the left U-shaped frame 1 and the right U-shaped frame 5, install it on the corresponding position of the low-pressure cylinder, and re-lock the six quick latches A14.

[0041] Step 5: Remove the support device from the low-pressure cylinder

[0042] After all maintenance work on the low-pressure cylinder of the steam turbine is completed, loosen the quick clamp C15, pull the column 11 out of the rotating pin hole seat 16, and use the lifting equipment to lift the support device to the storage site through the lifting lugs A3 and B6. Loosen the quick clamp A4 and quick clamp B12, and fold the left U-shaped frame 1, the right U-shaped frame 5, the optical axis 13 and the column 11 symmetrically along the rotating axis 2 and store them in the box. Remove the bolt 20, store the rotatable hinge frame 21 (including the quick clamp C15, the rotating pin hole seat 16, the rotating pin shaft 17, the quick latch B18, and the hinge frame 19) in the box, and transport it to the designated storage location.

Claims

1. A flexible sealing ring support device for a low-pressure cylinder of a steam turbine, characterized in that: It includes a left U-shaped frame, a right U-shaped frame, a rotating shaft, an optical axis, a column and a rotatable hinged frame; the left U-shaped frame and the right U-shaped frame are two half-symmetrical structures, which can be symmetrically unfolded or folded along the rotating shaft; the flexible sealing ring is stored in the left U-shaped frame and the right U-shaped frame and fixed with a quick latch A; the optical axis and the triangular reinforcing rod are connected by a quick clamp B; the column and the optical axis are connected by an L-shaped frame; the column and the triangular reinforcing rod are connected by a hinged structure; the rotatable hinged frame is assembled into a whole by a quick clamp C, a rotating pin hole seat, a rotating pin shaft, a quick latch B, and a hinge frame, and the rotating pin shaft is installed after drilling a hole on the hinge frame, and the rotating pin hole seat is hinged to the hinge frame through the rotating pin shaft, and the hinge point is located at the horizontal center line of the low-pressure cylinder of the turbine; the lower part of the column is inserted into the rotating pin hole seat, and then locked with a quick clamp C to form a whole; the left U-shaped frame and the right U-shaped frame can be flipped around the rotating pin shaft to leave the vertical center line.

2. The flexible sealing ring support device for a steam turbine low-pressure cylinder according to claim 1 is characterized in that: The left U-shaped frame and the right U-shaped frame can be symmetrically unfolded or folded along the rotating axis and locked by the quick clamp A.

3. The flexible sealing ring support device for a steam turbine low-pressure cylinder according to claim 1 is characterized in that: A lifting lug A is designed on the rotating shaft.

4. The flexible sealing ring support device for a steam turbine low-pressure cylinder according to claim 1, characterized in that: The left U-shaped frame and the right U-shaped frame are designed with lifting ears B.

5. The flexible sealing ring support device for a steam turbine low-pressure cylinder according to claim 1, characterized in that: The column and the optical axis are connected by an L-shaped frame and fastened by a fastener A.

6. The flexible sealing ring support device for a steam turbine low-pressure cylinder according to claim 1, characterized in that: The upright column and the triangular reinforcing rod are connected by a hinged structure and fastened by a fastener B.

7. The flexible sealing ring support device for a steam turbine low-pressure cylinder according to claim 1, characterized in that: The hinge frame is symmetrically fixed on both sides of the low-pressure cylinder of the steam turbine by bolts.

8. The flexible sealing ring support device for a steam turbine low-pressure cylinder according to claim 1, characterized in that: The hinge frame is formed by welding four Q235-B carbon steel plates.

9. The flexible sealing ring support device for a steam turbine low-pressure cylinder according to claim 1, characterized in that: The hinge frame is equipped with a quick latch B.

10. A working method of a flexible sealing ring support device for a steam turbine low-pressure cylinder, characterized in that: When the low-pressure cylinder is overhauled, the rotatable articulated frame is fixed symmetrically on both sides of the low-pressure cylinder of the turbine, and the supporting device is lifted to the corresponding position of the low-pressure cylinder using lifting equipment, and the left U-shaped frame, the right U-shaped frame, the optical axis and the column are unfolded along the rotating axis, and the column is inserted into the rotating pin hole seat, and then locked with quick clamp C to form a whole, and the support device is installed; open the quick latch A, put the flexible sealing ring into the left U-shaped frame and the right U-shaped frame, and re-lock the quick latch A. At this time, the flexible sealing ring is fixed; before the lifting operation of the low-pressure inner cylinder or rotor of the turbine begins, the rotating pin hole seat is flipped 30° around the rotating pin shaft, 1.1m away from the vertical center line. At this time, the flexible sealing ring has moved to the non-working position. Working position; when the lifting operation of the low-pressure inner cylinder or rotor of the turbine is completed, turn the rotating pin hole seat 30° around the rotating pin shaft and return to the vertical center line position. At this time, the flexible sealing ring has moved to the working position; open the quick latch A, move the flexible sealing ring out of the left U-shaped frame and the right U-shaped frame, install it on the corresponding position of the low-pressure cylinder, and re-lock the quick latch A; after all the maintenance work of the low-pressure cylinder of the turbine is completed, release the quick clamp C, pull the column out of the rotating pin hole seat, and use the lifting equipment to lift the supporting device to the storage site; fold the left U-shaped frame, the right U-shaped frame, the optical axis and the column symmetrically along the rotating axis and store them in the box; store the rotatable articulated frame in the box and transport it to the designated storage location.

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