A rigid-flexible cooperative steam turbine efficiency seal structure

Abstract

The utility model discloses a rigid and soft cooperation's steam turbine synergistic sealing structure, including metal main seal, one end of metal main seal is installed with graphite auxiliary seal, the inside of metal main seal is provided with the installation clamping groove, and the bottom of inside installation clamping groove all is provided with the hole body, the inside of installation clamping block all is installed with fixed bolt, one end of installation clamping groove all is provided with the connecting groove, and one end of connecting seat all is installed with metal ring. The utility model discloses through being provided with metal main seal and graphite auxiliary seal, establishes the quantitative relation model of graphite compression resilience characteristic and micro -gap leakage, reveals 30%~40% compression rate under graphite layer to sealing gap's real -time compensation efficiency >=85%, "metal main seal + graphite auxiliary seal" synergistic energy -dissipating structure main seal bears 90% pressure difference, and auxiliary seal absorbs pulsating kinetic energy through viscous dissipation, and system leakage rate reduces greatly, reaches near zero leakage level.

Description

Technical Field

[0001] This utility model relates to the technical field of turbine efficiency-enhancing sealing structure, specifically a rigid-flexible combined turbine efficiency-enhancing sealing structure. Background Technology

[0002] A steam turbine is a rotary power unit that converts steam into mechanical energy, widely used in power generation, industry, and other fields. Traditional alloy sealing surfaces used for the mating surfaces of steam turbine components suffer from a core drawback: rigid contact and non-adjustable clearance. Under extreme high-temperature and high-pressure conditions, the alloy sealing ring and steel mating surface cannot achieve an ideal metal-to-metal interference fit during operation due to differences in material thermal expansion coefficients and limitations in machining precision. This clearance may widen under hot conditions, forming a continuous microscale steam escape channel. Simultaneously, this structure lacks effective dynamic compensation capabilities, failing to adapt to changes in the mating surface caused by thermal deformation, vibration, and wear, leading to a decline in sealing effectiveness over time. The end result is high-quality steam leakage, directly causing energy loss (reduced cycle thermal efficiency), increased makeup water costs, and potentially affecting the stability and economy of unit operating parameters. Therefore, we propose a rigid-flexible synergistic steam turbine efficiency-enhancing sealing structure to address these problems. Utility Model Content

[0003] The purpose of this invention is to provide a turbine efficiency-enhancing sealing structure that combines rigidity and flexibility, in order to solve the problems of rigid contact and non-adjustable gap characteristics mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a rigid-flexible combined turbine efficiency-enhancing sealing structure, comprising a metal main seal, a graphite secondary seal installed at one end of the metal main seal, an installation groove provided inside the metal main seal, and a hole provided at the bottom end of each installation groove, an installation block installed at the bottom end of the graphite secondary seal, a fixing bolt installed inside each installation block, a connecting groove provided at one end of each installation groove, a connecting seat threadedly connected inside the connecting groove, and a metal ring installed at one end of each connecting seat.

[0005] As a further technical solution of this utility model, the cross-section of the mounting slot is larger than the cross-section of the mounting block, and the mounting slot and the mounting block form an engaging structure.

[0006] As a further technical solution of this utility model, a plurality of mounting slots are provided, and the plurality of mounting slots are distributed in a ring at equal intervals at one end inside the metal main seal.

[0007] As a further technical solution of this utility model, a plurality of mounting blocks are provided, and the plurality of mounting blocks are distributed in a ring at equal intervals at one end of the graphite sub-seal.

[0008] As a further technical solution of this utility model, the outer wall of the connecting seat is uniformly provided with external threads, and one side of the inside of the connecting groove is uniformly provided with internal threads, and the connecting seat and the connecting groove form a threaded connection.

[0009] As a further technical solution of this utility model, a plurality of fixing bolts are provided, and there is a one-to-one correspondence between the plurality of fixing bolts and the plurality of mounting blocks.

[0010] As a further technical solution of this utility model, a second reinforcing ring is provided at the bottom of the interior of the metal main seal, a supporting reinforcing rib is fixed at the top of the second reinforcing ring, and a first reinforcing ring is fixed at the top of the supporting reinforcing rib.

[0011] As a further technical solution of this utility model, a plurality of supporting reinforcing ribs are provided, and the plurality of supporting reinforcing ribs are distributed in a ring at equal intervals at the top end of the second reinforcing ring.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: It is equipped with a metal main seal and a graphite secondary seal, establishes a quantitative relationship model between graphite compression rebound characteristics and micro-gap leakage, and reveals that the real-time compensation efficiency of the graphite layer for the sealing gap is ≥85% under a compression rate of 30% to 40%. The "metal main seal + graphite secondary seal" collaborative energy-dissipating structure has the main seal bearing 90% of the pressure difference, and the secondary seal absorbs pulsating kinetic energy through viscous dissipation, which greatly reduces the system leakage rate and achieves a near-zero leakage level.

[0013] By incorporating components such as mounting slots, mounting blocks, fixing bolts, and metal rings, this sealing structure can limit and fix the graphite secondary seal installed on one side of the main metal seal during use. This ensures a stable connection between the main metal seal and the graphite secondary seal, making it less prone to displacement during use. Consequently, the sealing structure becomes more stable and performs better.

[0014] By incorporating components such as reinforcing ring one, reinforcing ring two, and supporting reinforcing ribs, these three components are connected together by welding to form a whole. Filling the interior of the metal main seal, this effectively improves the structural strength of the metal main seal, making it less prone to deformation and damage during use, and effectively extending the service life of the metal main seal. Attached Figure Description

[0015] Figure 1 This is a top view partial cross-sectional structural diagram of the present invention;

[0016] Figure 2 This is a schematic diagram of a partial cross-sectional structure of the present invention.

[0017] Figure 3 For the present utility model Figure 2 Enlarged cross-sectional view of point A in the middle;

[0018] Figure 4 This is a front view cross-sectional structural diagram of the metal main seal of this utility model.

[0019] In the diagram: 1. Metal main seal; 2. Mounting slot; 3. Hole; 4. Graphite secondary seal; 5. Connecting seat; 6. Metal ring; 7. Connecting groove; 8. Mounting block; 9. Fixing bolt; 10. Reinforcing ring one; 11. Reinforcing ring two; 12. Supporting reinforcing rib. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-4 The present invention provides an embodiment of a turbine efficiency-enhancing sealing structure with rigid-flexible synergy, comprising a metal main seal 1, a graphite secondary seal 4 installed at one end of the metal main seal 1, and an installation groove 2 provided inside the metal main seal 1.

[0022] Specifically, such as Figure 1 and Figure 2 As shown, a metal main seal 1 and a graphite secondary seal 4 are set up. A quantitative relationship model between graphite compression rebound characteristics and micro-gap leakage is established. It is revealed that the real-time compensation efficiency of the graphite layer for the sealing gap is ≥85% under a compression rate of 30% to 40%, while that of the traditional structure is <50%. In the collaborative energy-dissipating structure of "metal main seal 1 + graphite secondary seal 4", the main seal bears 90% of the pressure difference, and the secondary seal absorbs the pulsating kinetic energy through viscous dissipation. The system leakage rate is greatly reduced, reaching a near-zero leakage level.

[0023] The bottom of each mounting slot 2 has a hole 3. The bottom of the graphite secondary seal 4 has a mounting block 8. Each mounting block 8 has a fixing bolt 9 installed inside. One end of each mounting slot 2 has a connecting groove 7. The connecting groove 7 has a threaded connection to a connecting seat 5, and one end of each connecting seat 5 has a metal ring 6 installed. The cross-section of the mounting slot 2 is larger than the cross-section of the mounting block 8. The mounting slot 2 and the mounting block 8 form an engaging structure. Several mounting slots 2 are provided, and these slots are distributed in a ring at equal intervals at one end inside the metal main seal 1. Several mounting blocks 8 are also provided. The mounting blocks 8 are distributed in a ring at equal intervals at one end of the graphite secondary seal 4. Several fixing bolts 9 are provided, and there is a one-to-one correspondence between the several fixing bolts 9 and the several mounting blocks 8. The above-mentioned equally spaced locking structure and the several fixing bolts 9 are screwed into the mounting blocks 8 to make the metal main seal 1 and the graphite secondary seal 4 stably connected together to form a whole. The outer wall of the connecting seat 5 is uniformly provided with external threads, and one side of the inside of the connecting groove 7 is uniformly provided with internal threads. The connecting seat 5 and the connecting groove 7 form a threaded connection. The threaded connection design makes it easy to rotate the metal ring 6 to seal the metal main seal 1.

[0024] Specifically, such as Figure 1 , Figure 2 and Figure 3 As shown, during use, the graphite secondary seal 4 is stably installed together with the metal main seal 1 by several mounting blocks 8 at the bottom engaging with several mounting slots 2 inside the metal main seal 1. Then, the fixing bolts 9 are screwed into the hole 3 at the rear end of the metal main seal 1 to fix the mounting blocks 8, thereby making the metal main seal 1 and the graphite secondary seal 4 stably installed together. Then, the metal ring 6 is taken out and its connecting seat 5 is aligned with the connecting groove 7 inside the metal main seal 1 and screwed in to seal the connecting groove 7.

[0025] The bottom of the metal main seal 1 is provided with a reinforcing ring 2 11, and the top of the reinforcing ring 2 11 is fixed with a supporting reinforcing rib 12. The top of the supporting reinforcing rib 12 is fixed with a reinforcing ring 10. There are several supporting reinforcing ribs 12. The several supporting reinforcing ribs 12 are distributed in a ring at equal intervals at the top of the reinforcing ring 2 11, which has a better and more uniform reinforcement effect on the metal main seal 1.

[0026] Specifically, such as Figure 4 As shown, the three components, namely, the first reinforcing ring 10, the second reinforcing ring 11, and the supporting reinforcing rib 12, are connected together by welding to form a whole. This whole is set inside the metal main seal 1, which improves the structural strength of the metal main seal 1 and makes it less prone to deformation and damage during use.

[0027] Working principle: During use, the graphite secondary seal 4 is stably installed together with the metal main seal 1 by several mounting blocks 8 at the bottom engaging with several mounting slots 2 inside the metal main seal 1. Then, the fixing bolt 9 is screwed into the hole 3 from the rear end of the metal main seal 1 to fix the mounting blocks 8. The metal ring 6 is then taken and its connecting seat 5 is aligned with the connecting groove 7 and screwed in to seal the connecting groove 7. During use, a quantitative relationship model between the graphite compression rebound characteristics and micro-gap leakage is established between the metal main seal 1 and the graphite secondary seal 4. This model reveals that the real-time compensation efficiency of the graphite layer for the sealing gap at a compression rate of 30% to 40% is ≥85%, while that of the traditional structure is <50%. The "metal main seal 1 + graphite secondary seal 4" collaborative energy-dissipating structure has the main seal bearing 90% of the pressure difference, and the secondary seal absorbs the pulsating kinetic energy through viscous dissipation. The system leakage rate is greatly reduced, reaching a near-zero leakage level.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A rigid-flexible combined turbine efficiency-enhancing sealing structure, comprising a metal main seal (1), characterized in that: A graphite secondary seal (4) is installed at one end of the metal main seal (1). The metal main seal (1) is provided with an installation groove (2), and the bottom of the installation groove (2) is provided with a hole (3). An installation block (8) is installed at the bottom of the graphite secondary seal (4). A fixing bolt (9) is installed inside the installation block (8). A connecting groove (7) is provided at one end of the installation groove (2). A connecting seat (5) is threaded inside the connecting groove (7), and a metal ring (6) is installed at one end of the connecting seat (5).

2. The turbine efficiency-enhancing sealing structure with rigid-flexible synergy according to claim 1, characterized in that: The cross-section of the mounting slot (2) is larger than the cross-section of the mounting block (8), and the mounting slot (2) and the mounting block (8) form a locking structure.

3. The turbine efficiency-enhancing sealing structure with rigid-flexible synergy according to claim 1, characterized in that: The mounting slots (2) are provided in a plurality of manner, and the plurality of mounting slots (2) are distributed in a ring at equal intervals at one end inside the metal main seal (1).

4. The turbine efficiency-enhancing sealing structure with rigid-flexible synergy according to claim 1, characterized in that: The mounting blocks (8) are provided in a plurality of them, and the plurality of mounting blocks (8) are distributed in a ring at equal intervals at one end of the graphite sub-seal (4).

5. The turbine efficiency-enhancing sealing structure with rigid-flexible synergy according to claim 1, characterized in that: The outer wall of the connecting seat (5) is uniformly provided with external threads, and one side of the connecting groove (7) is uniformly provided with internal threads, and the connecting seat (5) and the connecting groove (7) form a threaded connection.

6. The turbine efficiency-enhancing sealing structure according to claim 1, characterized in that: The fixing bolts (9) are provided in a certain number, and there is a one-to-one correspondence between the fixing bolts (9) and the mounting blocks (8).

7. The turbine efficiency-enhancing sealing structure with rigid-flexible synergy according to claim 1, characterized in that: The bottom of the metal main seal (1) is provided with a second reinforcing ring (11), and the top of the second reinforcing ring (11) is fixed with a supporting reinforcing rib (12), and the top of the supporting reinforcing rib (12) is fixed with a first reinforcing ring (10).

8. The turbine efficiency-enhancing sealing structure with rigid-flexible synergy according to claim 7, characterized in that: The supporting reinforcing ribs (12) are provided in a plurality of them, and the plurality of supporting reinforcing ribs (12) are distributed in a ring at equal intervals at the top end of the second reinforcing ring (11).

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