Steam seal of steam turbine

Abstract

The utility model belongs to the field of steam turbines, and provides a steam seal of a steam turbine, which comprises a steam seal ring, a plurality of steam seal plates mounted in the steam seal ring, a plurality of mounting grooves formed in one end of the inner wall of the steam seal ring, limiting raised lines fixedly mounted on the outer surfaces of the steam seal plates, a plurality of fixing grooves formed in one ends of the inner walls of the mounting grooves, and limiting mechanisms arranged in the fixing grooves. The limiting mechanism comprises a supporting shaft, the supporting shaft is fixedly connected to one side edge of the inner wall of the fixing groove, the outer surface of the supporting shaft is sleeved with a limiting block, the position, located on one side edge of the limiting block, of the outer surface of the supporting shaft is sleeved with a torsional spring, and a limiting clamping groove is formed in the position, corresponding to the fixing groove, of the outer surface of the limiting protruding strip. According to the utility model, through the matching of the limiting mechanism (the supporting shaft, the limiting block and the torsion spring), the limiting raised line and the fixing groove, the mechanical locking of the steam sealing plate is realized, and in combination with the elastic assistance of the reset structure, the vibration and pressure disturbance during operation are effectively counteracted, the displacement of the steam sealing plate is reduced, and the uniformity of a steam sealing gap is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of steam turbines, specifically a steam seal for a steam turbine. Background Technology

[0002] Steam turbines, as rotary power machines that convert the thermal energy of steam into mechanical work, occupy a core position in fields such as power generation and industrial drives. Through the expansion of steam within the turbine's internal channels, they achieve an efficient conversion of thermal energy into mechanical energy, providing power output to various equipment. Steam seals, as key components of steam turbines, function to control steam leakage, thereby reducing energy loss, improving the turbine's thermodynamic cycle efficiency, ensuring efficient operation, and preventing equipment corrosion caused by air leakage.

[0003] However, existing steam turbine seals are generally installed using bolts to simply fix the seal plate and assemble it into the seal ring. This fixing method lacks comprehensive positioning and stable support for the seal plate. During turbine operation, due to complex operating conditions such as periodic pressure fluctuations caused by steam flow and vibrations caused by rotor rotation, the seal plate is prone to positional displacement, loosening, or even slight wobbling within the seal ring. If the seal plate is not stable enough, it will lead to uneven seal gaps, damage the original sealing structure, increase steam leakage, reduce turbine efficiency, and may also cause abnormal friction between the seal plate and the rotor, threatening the safe and stable operation of the equipment and adversely affecting the overall sealing effect of the seal. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a steam seal for a steam turbine, thereby resolving issues such as insufficient stability of existing steam seals when installed in the steam seal ring.

[0005] A steam seal for a steam turbine includes a steam seal ring, wherein a plurality of steam seal plates are installed inside the steam seal ring, a plurality of mounting grooves are provided at one end of the inner wall of the steam seal ring, a limiting protrusion is fixedly installed on the outer surface of the steam seal plate, a plurality of fixing grooves are provided at one end of the inner wall of the mounting groove, and a limiting mechanism is provided inside the fixing groove.

[0006] The limiting mechanism includes a support shaft, which is fixed to one side of the inner wall of the fixed groove. A limiting block is sleeved on the outer surface of the support shaft. A torsion spring is sleeved on one side of the outer surface of the support shaft at the limiting block. A limiting groove is formed on the outer surface of the limiting protrusion at the position corresponding to the fixed groove.

[0007] The limiting protrusion is also provided with a reset structure to control the placement position of the limiting block;

[0008] The upper surface of the gas seal ring is also provided with a positioning component for fixing the limiting protrusion inside the mounting groove.

[0009] Preferably, the reset structure includes an arc-shaped through hole, which is opened through the inside of the limiting protrusion. An arc-shaped support rod is movably installed inside the arc-shaped through hole, and a plurality of limiting pressure rods are fixedly connected to one side of the outer surface of the arc-shaped support rod through the limiting slot.

[0010] Preferably, the positioning component includes several placement slots, which are symmetrically opened on both sides of the upper surface of the steam seal ring. A positioning plate is installed inside the placement slot, and a threaded groove is opened at the bottom of the inner wall of the placement slot. A positioning bolt is threadedly connected to the upper surface of the positioning plate extending into the threaded groove.

[0011] Preferably, the top of the inner wall of the limiting slot extends into the arc-shaped through hole and is provided with a guide groove, one side of the outer surface of the limiting pressure rod is located inside the guide groove, and the limiting pressure rod and the guide groove are interlocked.

[0012] Preferably, the thickness of one side of the limiting block is greater than the thickness near the support shaft, and the one side of the limiting block is located inside the limiting slot, and the limiting block and the limiting slot engage with each other.

[0013] Preferably, the volume of the limiting protrusion is smaller than the internal volume of the mounting groove, the limiting protrusion is located inside the mounting groove, and the mounting groove and the limiting protrusion are mutually compatible.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. This utility model achieves mechanical locking of the steam seal plate through the cooperation of the limiting mechanism (support shaft, limiting block, torsion spring) with the limiting protrusion and fixing groove. Combined with the elastic assistance of the reset structure (arc-shaped support rod, limiting pressure rod), it effectively offsets the vibration and pressure disturbance during operation, reduces the displacement of the steam seal plate, and ensures the uniformity of the steam seal gap.

[0016] 2. This utility model achieves pre-positioning and secondary fastening of the steam seal plate installation through positioning components (placement groove, positioning plate, positioning bolt); the limiting mechanism and positioning components work together to form a double fixation of "mechanical locking + bolt fastening", which improves the steam seal plate's resistance to loosening.

[0017] 3. This utility model has a reset structure that allows the limit block to be manually reset via an arc-shaped support rod, which facilitates the inspection and replacement of the steam seal plate; the positioning component adopts a modular design, which allows the steam seal plate to be maintained without disassembling the entire steam seal ring. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2This is a schematic diagram of the arc-shaped support rod in this utility model;

[0020] Figure 3 This is a schematic cross-sectional view of the gas sealing ring in this utility model;

[0021] Figure 4 This utility model Figure 3 A magnified schematic diagram of part A in the diagram.

[0022] In the picture:

[0023] 1. Steam seal ring; 2. Mounting groove; 3. Steam seal plate; 4. Limiting protrusion; 5. Fixing groove; 6. Support shaft; 7. Limiting block; 8. Torsion spring; 9. Limiting slot; 10. Arc-shaped through hole; 11. Arc-shaped support rod; 12. Limiting pressure rod; 13. Placement groove; 14. Positioning plate; 15. Threaded groove; 16. Positioning bolt. Detailed Implementation

[0024] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0025] Example 1:

[0026] As attached Figure 1 To be continued Figure 4 As shown:

[0027] This utility model provides a steam seal for a steam turbine, including a steam seal ring 1, a plurality of steam seal plates 3 installed inside the steam seal ring 1, a plurality of mounting grooves 2 opened at one end of the inner wall of the steam seal ring 1, a limiting protrusion 4 fixedly installed on the outer surface of the steam seal plate 3, the volume of the limiting protrusion 4 being smaller than the internal volume of the mounting groove 2, the limiting protrusion 4 being located inside the mounting groove 2, the mounting groove 2 and the limiting protrusion 4 being mutually compatible, a plurality of fixing grooves 5 opened at one end of the inner wall of the mounting groove 2, and a limiting mechanism being provided inside the fixing grooves 5;

[0028] The limiting mechanism includes a support shaft 6, which is fixed to one side of the inner wall of the fixing groove 5. A limiting block 7 is sleeved on the outer surface of the support shaft 6. A torsion spring 8 is sleeved on the outer surface of the support shaft 6 at one side of the limiting block 7. A limiting groove 9 is opened on the outer surface of the limiting protrusion 4 at the position corresponding to the fixing groove 5. The thickness of one side of the limiting block 7 is greater than the thickness near the support shaft 6. One side of the limiting block 7 is located inside the limiting groove 9. The limiting block 7 and the limiting groove 9 are engaged with each other.

[0029] The limiting protrusion 4 is also equipped with a reset structure to control the placement position of the limiting block 7;

[0030] The upper surface of the gas seal ring 1 is also provided with a positioning component for fixing the limiting protrusion 4 inside the mounting groove 2.

[0031] As can be seen from the above, when installing the steam seal plate 3, the worker first aligns the limiting protrusion 4 of the steam seal plate 3 with the mounting groove 2 of the steam seal ring 1 and slowly inserts it (during the insertion process, the limiting protrusion 4 presses against the wedge-shaped surface of the limiting block 7, causing the limiting block 7 to compress the torsion spring 8 around the support shaft 6 and rotate, making room for the limiting protrusion 4); then, when the limiting slot 9 of the limiting protrusion 4 is aligned with the fixing groove 5, the torsion spring 8 elastically resets, pushing the limiting block 7 into the limiting slot 9 (the engagement of the limiting block 7 and the limiting slot 9 achieves the initial mechanical locking of the steam seal plate 3); then, the limiting protrusion 4 is fixed a second time through the positioning component (the positioning component can limit the axial displacement of the steam seal plate 3 along the mounting groove 2, enhancing the overall stability).

[0032] Reference Figure 2 and Figure 3 The positioning component includes several placement slots 13, which are symmetrically opened on both sides of the upper surface of the steam seal ring 1. A positioning plate 14 is installed inside the placement slot 13. A threaded groove 15 is opened at the bottom of the inner wall of the placement slot 13. A positioning bolt 16 is threadedly connected to the upper surface of the positioning plate 14 into the threaded groove 15.

[0033] As can be seen from the above, after the initial locking of the limiting mechanism is completed, the staff puts the positioning plate 14 into the placement groove 13 so that the positioning plate 14 covers the top of the limiting protrusion 4; then, the positioning bolt 16 is screwed into the threaded groove 15 and gradually tightened (during the tightening process, the positioning bolt 16 applies downward force so that the positioning plate 14 fits tightly against the bottom of the placement groove 13. Through the limiting effect of the positioning plate 14, the displacement of the limiting protrusion 4 along the axial and radial directions of the installation groove 2 is restricted, and secondary fastening is achieved).

[0034] Example 2:

[0035] Reference Figure 3 and Figure 4 The reset structure includes an arc-shaped through hole 10, which is opened through the inside of the limiting protrusion 4. An arc-shaped support rod 11 is movably installed inside the arc-shaped through hole 10. A number of limiting pressure rods 12 are fixedly connected to one side of the outer surface of the arc-shaped support rod 11 through the limiting groove 9. The top of the inner wall of the limiting groove 9 extends into the arc-shaped through hole 10 and is provided with a guide groove. One side of the outer surface of the limiting pressure rod 12 is located inside the guide groove. The limiting pressure rod 12 and the guide groove are interlocked.

[0036] As can be seen from the above, when it is necessary to disassemble the steam seal plate 3, the worker presses the arc-shaped support rod 11 into the arc-shaped through hole 10 (the arc-shaped support rod 11 rotates around the center of the arc-shaped through hole 10), which drives the limiting pressure rod 12 to move along the guide groove; the limiting pressure rod 12 presses the side of the limiting block 7, causing the limiting block 7 to rotate around the support shaft 6 and compress the torsion spring 8, thus disengaging from the limiting slot 9; at this time, the limiting protrusion 4 loses its mechanical locking and can be pulled out from the mounting slot 2, completing the disassembly of the steam seal plate 3.

[0037] Working principle: The initial positioning of the steam seal plate 3 is achieved through the limiting protrusion 4 and the mounting groove 2. The mechanical locking of the wedge-shaped limiting block 7 and the limiting slot 9 of the limiting mechanism, combined with the elastic restoring force of the torsion spring 8, forms the first layer of fixation within the steam seal ring 1. Then, the positioning plate 14 and the positioning bolt 16 of the positioning assembly limit the limiting protrusion 4 axially and radially, forming the second layer of fixation, thus doubly ensuring the installation stability of the steam seal plate 3.

[0038] When the steam turbine is running, the external forces generated by the steam pressure fluctuation and rotor vibration act on the steam seal plate 3. The torsion spring 8 of the limiting mechanism can absorb small vibration energy, and the engaging structure of the limiting block 7 and the limiting slot 9 resists axial displacement. The bolt tightening force of the positioning component limits radial displacement, and together they prevent the steam seal plate 3 from loosening or shifting.

[0039] During disassembly, the limit block 7 is manually controlled to disengage from the limit slot 9 by using the arc-shaped support rod 11 and the limit pressure rod 12 of the reset structure, thus releasing the mechanical lock; loosen the positioning bolt 16 and remove the positioning plate 14, and the steam seal plate 3 can be pulled out for inspection and replacement. The operation is convenient and does not damage the component structure.

[0040] The embodiments of this utility model are given for the purpose of illustration and description. Although embodiments of this utility model have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the utility model. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this utility model.

Claims

1. A steam seal for a steam turbine, comprising a steam seal ring (1), wherein a plurality of steam seal plates (3) are installed inside the steam seal ring (1), a plurality of mounting grooves (2) are provided at one end of the inner wall of the steam seal ring (1), and a limiting protrusion (4) is fixedly installed on the outer surface of the steam seal plate (3), characterized in that: The inner wall of the mounting groove (2) is provided with a plurality of fixing grooves (5) at one end, and a limiting mechanism is provided inside the fixing groove (5); The limiting mechanism includes a support shaft (6), which is fixed to one side of the inner wall of the fixing groove (5). A limiting block (7) is sleeved on the outer surface of the support shaft (6). A torsion spring (8) is sleeved on one side of the limiting block (7) on the outer surface of the support shaft (6). A limiting slot (9) is opened on the outer surface of the limiting protrusion (4) at the position corresponding to the fixing groove (5). The limiting protrusion (4) is also provided with a reset structure inside, which is used to control the placement position of the limiting block (7); The upper surface of the gas seal ring (1) is also provided with a positioning component for fixing the limiting protrusion (4) inside the mounting groove (2).

2. The steam seal for a steam turbine as set forth in claim 1, characterized in that: The reset structure includes an arc-shaped through hole (10), which is opened through the inside of the limiting protrusion (4). An arc-shaped support rod (11) is movably installed inside the arc-shaped through hole (10). A number of limiting pressure rods (12) are fixedly connected to one side of the outer surface of the arc-shaped support rod (11) through the limiting slot (9).

3. The steam seal for a steam turbine as set forth in claim 1, wherein: The positioning component includes several placement slots (13), which are symmetrically opened on both sides of the upper surface of the steam seal ring (1). A positioning plate (14) is installed inside the placement slot (13). A threaded groove (15) is opened at the bottom of the inner wall of the placement slot (13). A positioning bolt (16) is threadedly connected to the upper surface of the positioning plate (14) into the threaded groove (15).

4. The steam seal for a steam turbine as set forth in claim 2, wherein: The top of the inner wall of the limiting slot (9) extends into the arc-shaped through hole (10) and is provided with a guide groove. One side of the outer surface of the limiting pressure rod (12) is located inside the guide groove, and the limiting pressure rod (12) and the guide groove are interlocked.

5. The steam seal for a steam turbine as set forth in claim 1, wherein: The thickness of one side of the limiting block (7) is greater than the thickness near the support shaft (6). One side of the limiting block (7) is located inside the limiting slot (9). The limiting block (7) and the limiting slot (9) engage with each other.

6. The steam seal for a steam turbine as set forth in claim 1, wherein: The volume of the limiting protrusion (4) is smaller than the internal volume of the mounting groove (2). The limiting protrusion (4) is located inside the mounting groove (2). The mounting groove (2) and the limiting protrusion (4) are mutually compatible.

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