Steam seal device suitable for coal-fired generator

Abstract

The invention relates to the technical field of steam sealing, and discloses a steam sealing device suitable for a coal-fired generator, the steam sealing device comprises a steam sealing body, an insertion block, a screw rod, a damping sleeve and an assembly lug, a mounting cavity is formed in the steam sealing body, a steam sealing ring is inserted in the mounting cavity, and a mounting box is inserted in the lower side in the steam sealing body; the top end of the inserting block is connected with an assembling frame which is inserted into the steam sealing ring, and the assembling frame and the steam sealing ring are rotationally connected and limited through a screw. A transmission frame, a matching frame and a first spring connected with the side plate are arranged in the mounting box, and damping sleeves and inserted damping rods are arranged on the two sides of the top of an inner cavity; the steam sealing ring is provided with an insertion groove, and a comb plate is inserted into the insertion groove and fixed to the steam sealing ring through a top end assembling lug and a bolt. According to the device, rapid installation of the steam sealing ring is achieved through the assembly frame and the screw, the matching frame drives the transmission frame to compress the first spring during vibration, vibration energy is rapidly absorbed in combination with energy dissipation of the damping rod, a sealing gap is kept stable, steam leakage is avoided, and the service life is prolonged; the comb plate adopts a detachable design, so that the whole steam seal ring does not need to be disassembled when a single comb plate is damaged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steam seal, in particular to a steam seal device suitable for coal-fired generators. BACKGROUND

[0002] The comb tooth steam seal is composed of a small annular gap (referred to as a steam seal gap) and a steam expansion chamber by machining a plurality of comb teeth and concave-convex shoulders on the inner circle of the steam seal ring and the outer circle of the steam seal sleeve (the high-temperature part is the rotor shaft), and when the high-speed steam flow leaks through these small steam seal gaps, it will expand and slow down in the steam expansion chamber. This device uses the method of step-by-step throttling and speed reduction to reduce the axial leakage of steam.

[0003] Although the common steam seal device has the basic sealing function, the installation method of the steam seal ring is complex, and there is no effective vibration buffering mechanism, which is easy to cause the change of the sealing gap due to vibration during operation, causing sealing failure or steam leakage. At the same time, vibration can also accelerate the fatigue damage of parts, increase the failure probability, and shorten the service life of the device. In view of the shortcomings of the prior art, the present application provides a steam seal device suitable for coal-fired generators to solve the technical problems of insufficient vibration buffering, inconvenient maintenance and poor vibration absorption effect of the existing steam seal device, which cannot meet the working requirements of the steam seal. SUMMARY

[0004] In view of the shortcomings of the prior art, the present application provides a steam seal device suitable for coal-fired generators to solve the technical problems of complicated installation, poor vibration absorption effect and inconvenient replacement of comb tooth plates of the steam seal device.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a steam seal device suitable for coal-fired generators, comprising:

[0006] A steam seal body, a through hole is formed in the lower part of the steam seal body, an installation cavity is formed in the inside of the steam seal body, a steam seal ring is inserted into the inside of the installation cavity, and an installation box is inserted into the lower side of the inside of the steam seal body;

[0007] A plug-in block is inserted into the top of the installation box, a fitting frame is connected to the top end of the plug-in block, the fitting frame is inserted into the inside of the steam seal ring, and a threaded hole is formed in the inside of the steam seal ring and the fitting frame;

[0008] A screw rod is screwed into the inside of the threaded hole, a transmission frame is inserted into the lower side of the inside of the installation box, a matching frame is hinged to the two sides of the inside of the installation box through a bearing, the two sides of the outside of the transmission frame are connected to a side plate, and the top of the side plate is connected to a first spring;

[0009] A damping sleeve is installed on the two sides of the top of the inner cavity of the installation box, a damping rod is inserted into the inside of the damping sleeve, an insertion slot is formed in the fitting surface of the steam seal ring, and a comb tooth plate is inserted into the inside of the insertion slot;

[0010] The mounting ears are connected to the top of the comb plate, and bolts are inserted inside the mounting ears. The bolts are screwed into the corresponding positions inside the steam seal ring.

[0011] Preferably, the outer center of the steam seal ring has an assembly groove corresponding to the assembly frame. The assembly frame is inserted into the assembly groove, and the depth of the assembly groove is the same as the thickness of the assembly frame. This matching design of the assembly groove and the assembly frame allows the assembly frame to be precisely embedded into the steam seal ring, resulting in a tighter fit and effectively preventing relative displacement after installation. This structure ensures the positioning accuracy of the steam seal ring and the assembly frame, maintains the stability of the sealing gap, reduces the risk of loosening during vibration transmission, and further improves the overall reliability of the device assembly, laying the foundation for the stable performance of subsequent sealing and vibration absorption functions.

[0012] Preferably, a groove is provided on the front side of the threaded hole inside the steam seal ring. The diameter of the through hole is larger than the diameter of the groove. The through hole is positioned corresponding to the axis of the threaded hole. The groove provides ample operating space for the screw head or installation tools. The coaxial design of the through hole and the threaded hole allows for precise alignment of the screw with the threaded hole during installation, avoiding operational interference. This structure simplifies the screw assembly and disassembly process, improves maintenance convenience, and the groove protects the screw head, reducing the impact of steam erosion on the screw connection and ensuring the stability of the threaded connection.

[0013] Preferably, a second spring is circumferentially inserted into the inner wall of the mounting cavity, and a support sleeve is connected to the outer end of each second spring. The outer side of each support sleeve is spherically shaped and inserted into the assembly groove. The spherical support sleeve can flexibly fit against the inner wall of the assembly groove, and together with the elastic support of the second spring, it can provide circumferential buffer support for the steam seal ring. This structure can effectively disperse the radial force on the steam seal ring, buffer radial vibration during operation, avoid component damage caused by local stress concentration, and help maintain the rationality of the sealing gap, further improving the vibration resistance and operational stability of the device.

[0014] Preferably, the transmission frame has slots on both its inner sides and the insert block on both its outer sides, and the mating frame has retaining shafts at both ends. These retaining shafts are inserted into the slots. This interlocking design between the retaining shafts and the slots ensures a more secure connection between the mating frame, the transmission frame, and the insert block, preventing slippage or misalignment during transmission. This structure ensures that the force generated by vibration is accurately transmitted to the first spring and the damping rod, guaranteeing smooth transmission of the vibration absorption system, preventing transmission failure from affecting the vibration absorption and energy dissipation effect, and improving the reliability of the vibration buffer structure.

[0015] Preferably, the inclination angles of the mating frames are symmetrically arranged, the bottom ends of the damping rods are connected to the corresponding positions on the top of the transmission frame, and the top of the mounting box has circular holes corresponding to the positions of the damping rods. The symmetrical inclination design of the mating frames ensures balanced force on both sides, preventing uneven load during vibration transmission and guaranteeing smooth transmission. The circular holes provide flexible movement space for the damping rods, ensuring smooth extension and retraction, and working in conjunction with the first spring to enhance the efficiency of vibration absorption and energy dissipation. This structure further optimizes the force distribution of the vibration absorption system and improves the device's ability to cope with vibrations in different directions.

[0016] Preferably, sealing strips are laid on both sides of the inner cavity of the slot, chamfers are provided at the outer edges of the comb plate, and damping pads are laid on the outer surface of the comb plate. The sealing strips enhance the fit and sealing between the comb plate and the slot, effectively preventing steam from leaking from the gaps and improving the overall sealing effect. The chamfer design makes the insertion of the comb plate smoother and reduces bumps and wear during assembly. The damping pads can buffer the vibration of the comb plate during operation, reduce friction damage with the slot, extend the service life of the comb plate, and improve the stability of the comb plate after installation.

[0017] Preferably, the outer surface of the steam seal body is provided with a heat-insulating coating made of nano-ceramic material, and the outer surface of the assembly frame is provided with a wear-resistant layer made of tungsten carbide. The nano-ceramic heat-insulating coating can effectively prevent heat loss from the steam seal body to the outside, protecting surrounding components from high temperatures and reducing energy loss. The tungsten carbide wear-resistant layer significantly improves the wear resistance of the assembly frame, resisting frictional damage during long-term use. This structure extends the service life of the steam seal body and the assembly frame, ensuring long-term stable operation of the device under high-temperature and high-friction conditions.

[0018] Preferably, the comb plate has internal reinforcing ribs arranged in a grid pattern. The length of each mounting lug is greater than the cross-sectional width of the comb plate. The grid-like reinforcing ribs significantly improve the structural strength and deformation resistance of the comb plate, better coping with stresses caused by steam impact and vibration. The extended mounting lugs increase the contact area with the steam seal ring, making the comb plate more secure and preventing loosening or displacement during operation. This structure enhances the durability and installation reliability of the comb plate, ensuring continuous and stable sealing performance.

[0019] Preferably, a corrugated anti-loosening washer is sandwiched between the inner side of the bolt and the contact surface of the mounting lug, and a nylon washer is fitted on the outer side of the screw where it contacts the groove. The corrugated anti-loosening washer utilizes its own elastic properties to effectively offset the impact of unit vibration on the bolt, prevent the bolt from loosening, and ensure the long-term secure fixing of the comb plate. The nylon washer reduces frictional wear between the screw and the groove, and also acts as a buffer to avoid damage caused by direct metal-to-metal contact. This structure protects the connection points of the bolt and screw, extends the service life of the components, and improves the stability of the device operation.

[0020] Compared with the prior art, the present invention provides a steam sealing device suitable for coal-fired power generators, which has the following beneficial effects:

[0021] 1. This steam sealing device, applicable to coal-fired generators, allows the steam sealing ring to be directly inserted into the mounting cavity and fitted onto the outside of the mounting frame via an added assembly frame. The screw provides limiting, thus completing the installation of the steam sealing ring. Simultaneously, the added mating frame allows the transmission frame to compress the first spring when the steam sealing ring vibrates. This, combined with the elastic buffering of the first spring and the energy dissipation effect of the damping rod, quickly absorbs vibration energy, maintaining a reasonable sealing gap between the steam sealing ring and the rotor. This prevents seal failure or steam leakage due to vibration, ensuring the stability of the unit's steam utilization efficiency. Furthermore, the effective vibration suppression reduces fatigue damage to various components of the steam sealing device, lowers the probability of vibration-induced failures, and extends the overall service life of the steam sealing device.

[0022] 2. This steam sealing device, applicable to coal-fired generators, features slots that allow the toothed plates to be inserted and secured to the steam sealing ring with bolts and mounting ears. This eliminates the need to disassemble the entire steam sealing ring when a toothed plate becomes worn or damaged; instead, only the corresponding toothed plate needs to be removed and replaced individually. This simplifies maintenance procedures, reduces the workload of maintenance personnel, decreases spare parts consumption, and lowers equipment maintenance costs. Furthermore, the individual replacement mode flexibly adapts to different wear levels of toothed plates, avoiding the resource waste caused by overall replacement and improving the targeted and flexible nature of maintenance. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the steam seal body and steam seal ring of the present invention;

[0025] Figure 3 This is a schematic diagram of the internal structure of the gas seal body of the present invention;

[0026] Figure 4 This is a schematic diagram of the steam seal ring structure of the present invention;

[0027] Figure 5 This is a schematic cross-sectional view of the steam seal body of the present invention;

[0028] Figure 6 This is a cross-sectional view of the mounting box of the present invention;

[0029] Figure 7 This is a schematic diagram of the assembly structure of the slot and comb plate of the present invention.

[0030] In the diagram: 1. Steam seal body; 2. Through hole; 3. Mounting cavity; 4. Steam seal ring; 5. Assembly groove; 6. Mounting box; 7. Insert block; 8. Assembly frame; 9. Threaded hole; 10. Screw; 11. Groove; 12. Transmission frame; 13. Side plate; 14. First spring; 15. Mating frame; 16. Slot; 17. Snap pin; 18. Damping sleeve; 19. Damping rod; 20. Slot; 21. Comb plate; 22. Assembly ear; 23. Bolt; 24. Second spring; 25. Support sleeve. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] This invention provides a technical solution: a steam seal device suitable for coal-fired generators, comprising a steam seal body 1, a through hole 2, a mounting cavity 3, a steam seal ring 4, an assembly groove 5, a mounting box 6, a plug 7, an assembly frame 8, a threaded hole 9, a screw 10, a groove 11, a transmission frame 12, a side plate 13, a first spring 14, a mating frame 15, a slot 16, a retaining shaft 17, a damping sleeve 18, a damping rod 19, a slot 20, a comb plate 21, an assembly ear 22, a bolt 23, a second spring 24, and a support sleeve 25.

[0033] Please see Figure 1 The lower part of the steam seal body 1 has a through hole 2, please refer to Figure 2 The steam seal body 1 has an internal mounting cavity 3, and a steam seal ring 4 is inserted into the mounting cavity 3. Please refer to [link / reference]. Figure 5 An installation box 6 is inserted into the lower side of the interior of the gas seal body 1;

[0034] Please see Figure 6 Insert 7 is inserted into the top of the mounting box 6. The top of the insert 7 is connected to the mounting bracket 8. The mounting bracket 8 is inserted into the inside of the steam seal ring 4. Both the steam seal ring 4 and the mounting bracket 8 have threaded holes 9 inside.

[0035] Please see Figure 3Screw 10 is screwed into the inside of threaded hole 9. Please refer to [link / reference]. Figure 6 The lower side of the mounting box 6 is fitted with a transmission frame 12. Both sides of the mounting box 6 are hinged with bearings to a mating frame 15. Both sides of the transmission frame 12 are connected to a side plate 13. The top of the side plate 13 is connected to a first spring 14.

[0036] Damping sleeves 18 are installed on both sides of the top of the inner cavity of the mounting box 6. Damping rods 19 are inserted inside the damping sleeves 18. Please refer to [link / reference]. Figure 7 The mounting surface of the steam seal ring 4 is provided with a slot 20, and a comb plate 21 is inserted into the slot 20.

[0037] The added assembly frame 8 allows the steam seal ring 4 to be directly inserted into the mounting cavity 3 and fitted onto the outside of the assembly frame 8. The screw 10 completes the positioning, thus completing the installation of the steam seal ring 4. At the same time, the added mating frame 15 allows the transmission frame 12 to compress the first spring 14 when the steam seal ring 4 vibrates. This allows the elastic buffer of the first spring 14 and the energy dissipation effect of the damping rod 19 to quickly absorb vibration energy, thereby maintaining a reasonable sealing gap between the steam seal ring 4 and the rotor. This prevents seal failure or steam leakage caused by vibration, ensuring the stability of the unit's steam utilization efficiency. In addition, the effective suppression of vibration reduces fatigue damage to various components of the steam seal device, lowers the probability of failure caused by vibration, and extends the overall service life of the steam seal device.

[0038] The mounting ear 22 is connected to the top of the comb plate 21. Bolts 23 are inserted inside the mounting ear 22, and the bolts 23 are screwed into the corresponding positions inside the steam seal ring 4.

[0039] Please see Figure 2 An assembly groove 5 is provided on the outer center of the steam seal ring 4 at a position corresponding to the assembly frame 8. The assembly frame 8 is inserted into the assembly groove 5, and the depth of the assembly groove 5 is the same as the thickness of the assembly frame 8. Please refer to [link / reference]. Figure 4 The threaded hole 9 inside the steam seal ring 4 has a groove 11 on the front side. The diameter of the through hole 2 is larger than the diameter of the groove 11. The opening of the through hole 2 is located corresponding to the axial position of the threaded hole 9.

[0040] The slot 20 allows the comb plate 21 to be inserted into it and fixed to the steam seal ring 4 by bolts 23 and mounting ears 22. This means that when a comb plate 21 is worn or damaged, it is not necessary to disassemble the entire steam seal ring 4. Only the corresponding comb plate 21 needs to be removed and replaced individually. This simplifies the maintenance operation, reduces the workload of maintenance personnel, reduces spare parts consumption, and lowers equipment maintenance costs. In addition, the individual replacement mode can flexibly adapt to the wear degree of different comb plates 21, avoids the waste of resources caused by overall replacement, and improves the targeting and flexibility of maintenance.

[0041] Please see Figure 5 A second spring 24 is inserted circumferentially into the inner wall of the mounting cavity 3. Each second spring 24 has a supporting sleeve 25 connected to its outer end. The outer sides of the supporting sleeves 25 are spherical. The supporting sleeves 25 are all inserted into the assembly groove 5. Please refer to [link / reference]. Figure 6 The transmission frame 12 has slots 16 on both sides inside and on both sides outside of the insert block 7. The left and right ends of the mating frame 15 are equipped with locking shafts 17, which are inserted into the slots 16.

[0042] The tilt angles of the mounting frame 15 are symmetrically arranged. The bottom ends of the damping rods 19 are connected to the corresponding positions of the top of the transmission frame 12. The top of the mounting box 6 is provided with round holes at the corresponding positions of the damping rods 19. Sealing strips are laid on both sides of the inner cavity of the slot 20. Chamfers are provided at the outer edges of the comb plate 21. Damping pads are laid on the outer surface of the comb plate 21. The outer surface of the steam seal 1 is provided with a heat insulation coating made of nano-ceramic material. The outer surface of the mounting frame 8 is provided with a wear-resistant layer made of tungsten carbide coating.

[0043] The comb plate 21 has reinforcing ribs inside, which are distributed in a grid pattern inside the comb plate 21. The length of the mounting ears 22 is greater than the cross-sectional width of the comb plate 21. A wave-shaped anti-loosening washer is clamped between the inner side of the bolt 23 and the contact surface of the mounting ear 22. A nylon washer is fitted on the outer side of the screw 10 at the position where it contacts the groove 11.

[0044] This design, through the addition of an assembly frame 8, allows the steam seal ring 4 to be directly inserted into the mounting cavity 3 and fitted onto the outside of the assembly frame 8. The screw 10 provides positioning, thus completing the installation of the steam seal ring 4. Simultaneously, the addition of a mating frame 15 allows the transmission frame 12 to compress the first spring 14 when the steam seal ring 4 vibrates. This, combined with the elastic buffering of the first spring 14 and the energy dissipation effect of the damping rod 19, quickly absorbs vibration energy, maintaining a reasonable sealing gap between the steam seal ring 4 and the rotor. This prevents seal failure or steam leakage due to vibration, ensuring the stability of the unit's steam utilization efficiency. Furthermore, the effective vibration suppression reduces fatigue damage to various components of the steam seal device. This design reduces the probability of failures caused by vibration, extends the overall service life of the steam sealing device, and allows the slot 20 to be inserted into the steam sealing ring 4. The slot 20 is then secured to the steam sealing ring 4 with bolts 23 and mounting ears 22. This means that when a particular steam sealing ring 4 is worn or damaged, the entire steam sealing ring 4 does not need to be disassembled. Only the corresponding steam sealing ring 4 needs to be disassembled and replaced individually. This simplifies the maintenance process, reduces the workload of maintenance personnel, reduces spare parts consumption, and lowers equipment maintenance costs. In addition, the individual replacement mode can flexibly adapt to the wear degree of different steam sealing rings 21, avoiding the waste of resources caused by overall replacement and improving the targeting and flexibility of maintenance.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A steam sealing device suitable for coal-fired generators, characterized in that, include: A steam seal body (1) has a through hole (2) at its lower part, an installation cavity (3) is provided inside the steam seal body (1), a steam seal ring (4) is inserted inside the installation cavity (3), and an installation box (6) is inserted inside the lower side of the steam seal body (1). Insert (7) is inserted into the top of the mounting box (6). The top of the insert (7) is connected to the mounting bracket (8). The mounting bracket (8) is inserted into the inside of the steam seal ring (4). Both the steam seal ring (4) and the mounting bracket (8) have threaded holes (9). The screw (10) is screwed into the inside of the threaded hole (9). The transmission frame (12) is inserted into the lower side of the inside of the mounting box (6). The two sides inside the mounting box (6) are hinged with a mating frame (15) through a bearing. The two sides outside the transmission frame (12) are connected with side plates (13). The top of the side plates (13) is connected with a first spring (14). Damping sleeves (18) are installed on both sides of the top of the inner cavity of the mounting box (6). Damping rods (19) are inserted inside the damping sleeves (18). Slots (20) are opened on the assembly surface of the steam seal ring (4). Comb plates (21) are inserted inside the slots (20). The mounting ear (22) is connected to the top of the comb plate (21). Bolts (23) are inserted inside the mounting ear (22), and the bolts (23) are screwed into the corresponding positions inside the steam seal ring (4).

2. The steam sealing device for a coal-fired generator according to claim 1, characterized in that: The outer middle of the gas seal ring (4) is provided with an assembly groove (5) at a position corresponding to the assembly frame (8). The assembly frame (8) is inserted into the assembly groove (5), and the depth of the assembly groove (5) is the same as the thickness of the assembly frame (8).

3. The steam sealing device for a coal-fired generator according to claim 1, characterized in that: The threaded hole (9) inside the gas seal ring (4) has a groove (11) on the front side. The diameter of the through hole (2) is larger than the diameter of the groove (11). The opening of the through hole (2) is located corresponding to the axial position of the threaded hole (9).

4. A steam sealing device suitable for coal-fired generators according to claim 2, characterized in that: The inner wall of the mounting cavity (3) is circumferentially inserted with a second spring (24), and the outer end of the second spring (24) is connected with a support sleeve (25). The outer side of the support sleeve (25) is spherically arranged, and the support sleeve (25) is inserted into the interior of the assembly groove (5).

5. A steam sealing device for a coal-fired generator according to claim 1, characterized in that: The transmission frame (12) has slots (16) on both sides inside and on both sides outside of the insert (7). The mating frame (15) has a shaft (17) on both the left and right ends. The shaft (17) is inserted into the slot (16).

6. A steam sealing device for a coal-fired generator according to claim 5, characterized in that: The inclination angles of the mating frame (15) are symmetrically arranged, the bottom ends of the damping rods (19) are connected to the corresponding positions of the top of the transmission frame (12), and the top of the mounting box (6) is provided with round holes at the corresponding positions of the damping rods (19).

7. A steam sealing device for a coal-fired generator according to claim 1, characterized in that: The inner sides of the slot (20) are covered with sealing strips, the outer edges of the comb plate (21) are chamfered, and the outer surface of the comb plate (21) is covered with damping pads.

8. A steam sealing device for a coal-fired generator according to claim 1, characterized in that: The outer surface of the steam seal (1) is provided with a heat insulation coating, which is made of nano-ceramic material. The outer surface of the assembly frame (8) is provided with a wear-resistant layer, which is made of tungsten carbide coating.

9. A steam sealing device for a coal-fired generator according to claim 1, characterized in that: The comb plate (21) is provided with reinforcing ribs inside, and the reinforcing ribs are distributed in a grid pattern inside the comb plate (21). The length of the mounting ears (22) is greater than the cross-sectional width of the comb plate (21).

10. A steam sealing device for a coal-fired generator according to claim 3, characterized in that: A corrugated anti-loosening washer is provided between the inner side of the bolt (23) and the contact surface of the mounting ear (22), and a nylon washer is provided at the position where the outer side of the screw (10) contacts the groove (11).

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