Composite comb tooth steam seal

Abstract

The utility model belongs to the field of comb tooth steam seals, and particularly relates to a composite comb tooth steam seal which comprises a steam seal ring, a connecting body is fixedly connected to the surface of the steam seal ring, and a composite structure is arranged on one side of the steam seal ring. Through the composite structure, the comb plate in the composite structure is fixedly connected with the mounting plate, so that the comb plate is connected with the steam seal ring through the mounting plate, the brush is fixedly mounted in front of the comb plate through the connecting seat, and the brush can adopt densely arranged fine metal wires; the effect that steam leakage mainly occurs in tiny gaps formed among densely-arranged fine metal wires, zigzag paths formed by the gaps ensure non-uniformity of fluid flowing in the gaps, the fluid generates a self-sealing effect, and therefore the leakage is effectively reduced is achieved, and the problem that if the number of flow channels is small, the sealing effect is poor is solved. And the pressure of the steam between the stages is reduced, so that the throttling effect is reduced, and the steam leakage rate is increased.

Description

Technical Field

[0001] This utility model relates to the field of comb-tooth steam seals, specifically a composite comb-tooth steam seal. Background Technology

[0002] The comb-tooth steam seal has many mating comb teeth and concave and convex shoulders machined 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), forming a tiny annular gap (called the steam seal gap) and a steam expansion chamber. When the leaking high-speed steam flows through these small steam seal gaps, it will expand and slow down in the steam expansion chamber. This device uses a step-by-step throttling and speed reduction method to reduce the leakage of gas along the axial direction.

[0003] However, most traditional comb-tooth structures are relatively fixed and simple. Comb-tooth steam seals reduce steam leakage through multi-stage throttling. If there are fewer flow channels, the pressure reduction of steam between each stage will be reduced, thereby reducing the throttling effect and increasing the amount of steam leakage. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, comb-tooth steam seals reduce steam leakage through multi-stage throttling. However, if there are fewer flow channels, the pressure reduction between each stage will be reduced, thereby reducing the throttling effect and increasing steam leakage. This invention proposes a composite comb-tooth steam seal.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a composite comb-tooth steam seal, including a steam seal ring, a connecting body fixedly connected to the surface of the steam seal ring, and a composite structure provided on one side of the steam seal ring;

[0006] The composite structure includes a mounting plate, the surface of which is attached to the inner wall of the gas seal ring. A comb plate is fixedly connected to the inner wall of the mounting plate. Several through holes are opened on the surface of the mounting plate. A connecting seat is provided on one side of the mounting plate, and a brush is fixedly connected to one side of the connecting seat.

[0007] Preferably, an additional flow channel is provided on one side of the connecting seat and one side of the comb plate, and a pressure balance chamber is opened in the inner cavity of the connecting seat.

[0008] Preferably, the inner wall of the steam seal ring has a cavity, the inner wall of the cavity communicates with the inner wall of the through hole, and a first baffle is fixedly connected to the inner wall of the cavity.

[0009] Preferably, a second spoiler is fixedly connected to one side of the mounting plate, and the second spoiler and the first spoiler are positioned at different angles.

[0010] Preferably, the inner cavity of the mounting plate and the inner wall of the steam seal ring are provided with fixing holes, and the inner wall of the fixing holes is threaded with fixing bolts.

[0011] Preferably, the surface of the steam seal ring is provided with a steam seal body, the inner cavity of the steam seal body is provided with a connecting groove, and the surface of the connecting body is slidably connected to the inner wall of the connecting groove.

[0012] Preferably, a damping telescopic rod is fixedly connected to the inner wall of the connecting groove, one end of the damping telescopic rod is fixedly connected to the connecting body, and a relief spring is sleeved on the surface of the damping telescopic rod. One end of the relief spring is fixedly connected to the inner wall of the connecting groove, and the other end of the relief spring is fixedly connected to the surface of the connecting body.

[0013] The utility model is beneficial in that:

[0014] This invention utilizes a composite structure in which the comb plate is fixedly connected to the mounting plate. The comb plate is then connected to the steam seal ring via the mounting plate, improving the ease of subsequent assembly and disassembly of the comb plate. A brush is fixedly installed before the comb plate via a connecting seat. The brush can be made of densely arranged fine metal wires, ensuring that steam leakage mainly occurs in the tiny gaps formed between the densely arranged fine metal wires. The tortuous path formed by these gaps ensures the uneven flow of the fluid, creating a self-sealing effect and effectively reducing leakage. This solves the problem that comb-type steam seals reduce steam leakage through multi-stage throttling, but if there are fewer flow channels, the pressure reduction between each stage will be less, thus reducing the throttling effect and increasing steam leakage. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a three-dimensional schematic diagram of the composite structure of this utility model;

[0018] Figure 3 This is a schematic diagram showing the connection between the gas seal ring and the mounting plate of this utility model;

[0019] Figure 4 This is a schematic diagram of the arrangement of the first and second spoilers of this utility model.

[0020] In the diagram: 1. Steam seal ring; 2. Connector; 3. Composite structure; 301. Mounting plate; 302. Comb plate; 303. Connecting seat; 304. Brush; 305. Through hole; 4. Additional flow channel; 5. Pressure balance chamber; 6. Cavity; 7. First spoiler; 8. Second spoiler; 9. Fixing hole; 10. Fixing bolt; 11. Steam seal body; 12. Connecting groove; 13. Damping telescopic rod; 14. Relief spring. Detailed Implementation

[0021] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] The following is combined with Figure 1-4 This application will be described in further detail.

[0023] This application discloses a composite comb-tooth steam seal. (Refer to...) Figure 1 and Figure 2 A composite comb-type steam seal includes a steam seal ring 1, a connector 2 fixedly connected to the surface of the steam seal ring 1, and a composite structure 3 provided on one side of the steam seal ring 1.

[0024] The composite structure 3 includes a mounting plate 301, the surface of which is attached to the inner wall of the steam seal ring 1. A comb plate 302 is fixedly connected to the inner wall of the mounting plate 301. Several through holes 305 are provided on the surface of the mounting plate 301. A connecting seat 303 is provided on one side of the mounting plate 301, and a brush 304 is fixedly connected to one side of the connecting seat 303. In this composite comb-type steam seal, the comb plate 302 in the composite structure 3 is fixedly connected to the mounting plate 301, so that the comb plate 302 is connected to the steam seal ring 1 through the mounting plate 301, which improves the convenience of subsequent disassembly and assembly of the comb plate 302. The brush 304 is fixedly installed in front of the comb plate 302 through the connecting seat 303. The brush 304 can be made of densely arranged fine metal wires, so that steam leakage mainly occurs in the tiny gaps formed between the densely arranged fine metal wires. The tortuous path formed by these gaps ensures the non-uniformity of fluid flow in it, so that the fluid generates a self-sealing effect, thereby effectively reducing leakage.

[0025] Reference Figure 4An additional flow channel 4 is provided on one side of the connecting seat 303 and one side of the comb plate 302. A pressure balance chamber 5 is provided in the inner cavity of the connecting seat 303. Through the pressure balance chamber 5, the additional flow channel 4 can release the fluid between the brush 304 and the comb plate 302. The fluid entering the additional flow channel 4 is released through the pressure balance chamber 5, which can increase the flow channel of the fluid and improve the steam release space.

[0026] Reference Figure 4 The inner wall of the steam sealing ring 1 has a cavity 6, and the inner wall of the cavity 6 communicates with the inner wall of the through hole 305. A first baffle 7 is fixedly connected to the inner wall of the cavity 6, and a second baffle 8 is fixedly connected to one side of the mounting plate 301. The positions of the second baffle 8 and the first baffle 7 are staggered. Through the arrangement of the first baffle 7 and the second baffle 8, the cavity 6 can increase the steam release space. The first baffle 7 and the second baffle 8 can form a staggered flow channel in the cavity 6. After the steam enters the cavity 6 through the through hole 305, it expands and slows down, increasing the release efficiency.

[0027] Reference Figure 3 The inner cavity of the mounting plate 301 and the inner wall of the steam seal ring 1 are both provided with fixing holes 9. The inner wall of the fixing holes 9 is threaded with fixing bolts 10. After the mounting plate 301 and the steam seal ring 1 are attached by the fixing bolts 10, the two sets of fixing holes 9 are connected. The mounting plate 301 and the steam seal ring 1 are fixedly connected by the fixing bolts 10. This connection method improves the convenience of disassembly and assembly.

[0028] Reference Figure 2 A steam seal body 11 is provided on the surface of the steam seal ring 1. A connecting groove 12 is provided in the inner cavity of the steam seal body 11. The surface of the connecting body 2 is slidably connected to the inner wall of the connecting groove 12. A damping telescopic rod 13 is fixedly connected to the inner wall of the connecting groove 12. One end of the damping telescopic rod 13 is fixedly connected to the connecting body 2. A relief spring 14 is sleeved on the surface of the damping telescopic rod 13. One end of the relief spring 14 is fixedly connected to the inner wall of the connecting groove 12 and the other end is fixedly connected to the surface of the connecting body 2. By setting the connecting body 2, the steam seal ring 1 and the connecting groove 12 of the steam seal body 11 can be quickly connected. The connecting groove 12 can also be regarded as a relief cavity. When the comb plate 302 in the composite structure 3 accidentally rubs against the rotor, the force brought by the friction can be absorbed by the relief spring 14. The stability of the relief spring 14 can be improved by the damping telescopic rod 13.

[0029] Working principle: Connector 2 allows for quick connection between the steam seal ring 1 and the connecting groove 12 of the steam seal body 11. The connecting groove 12 can also be considered as a relief cavity. When the comb plate 302 in the composite structure 3 accidentally rubs against the rotor, the relief spring 14 can absorb the force of friction. Furthermore, the stability of the relief spring 14 can be improved by the damping telescopic rod 13. The comb plate 302 in the composite structure 3 is fixedly connected to the mounting plate 301, thereby connecting the comb plate 302 to the steam seal ring 1 through the mounting plate 301, improving the convenience of subsequent disassembly and assembly of the comb plate 302. The brush 304 is fixedly installed in front of the comb plate 302 through the connecting seat 303. The brush 304 can be made of densely arranged fine metal. The fine metal wires ensure that steam leakage mainly occurs in the tiny gaps formed between the densely arranged fine metal wires. The tortuous path formed by these gaps ensures the non-uniformity of the fluid flow, creating a self-sealing effect and effectively reducing leakage. The additional flow channel 4 allows the fluid between the brush 304 and the comb plate 302 to be released. The fluid entering the additional flow channel 4 is released through the pressure balance chamber 5, which increases the fluid flow channel and improves the steam release space. The cavity 6 can further improve the steam release space. The first baffle 7 and the second baffle 8 can form a staggered flow channel in the cavity 6. After the steam enters the cavity 6 through the through hole 305, it expands and slows down, increasing the release efficiency.

[0030] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention as claimed.

Claims

1. A composite comb-tooth steam seal, characterized in that: It includes a steam seal ring (1), a connector (2) is fixedly connected to the surface of the steam seal ring (1), and a composite structure (3) is provided on one side of the steam seal ring (1); The composite structure (3) includes a mounting plate (301), the surface of which is attached to the inner wall of the steam seal ring (1), a comb plate (302) is fixedly connected to the inner wall of the mounting plate (301), and through holes (305) are opened on the surface of the mounting plate (301). The number of through holes (305) is several. A connecting seat (303) is provided on one side of the mounting plate (301), and a brush (304) is fixedly connected to one side of the connecting seat (303).

2. The composite comb-tooth steam seal according to claim 1, characterized in that: An additional flow channel (4) is provided on one side of the connecting seat (303) and one side of the comb plate (302), and a pressure balance chamber (5) is opened in the inner cavity of the connecting seat (303).

3. The composite comb-tooth steam seal according to claim 1, characterized in that: The inner wall of the steam seal ring (1) has a cavity (6), the inner wall of the cavity (6) is in communication with the inner wall of the through hole (305), and a first baffle plate (7) is fixedly connected to the inner wall of the cavity (6).

4. A composite comb-tooth steam seal according to claim 3, characterized in that: A second spoiler (8) is fixedly connected to one side of the mounting plate (301), and the positions of the second spoiler (8) and the first spoiler (7) are staggered.

5. A composite comb-type steam seal according to claim 1, characterized in that: The inner cavity of the mounting plate (301) and the inner wall of the steam seal ring (1) are both provided with fixing holes (9), and the inner wall of the fixing holes (9) is threaded with fixing bolts (10).

6. A composite comb-type steam seal according to claim 1, characterized in that: The surface of the steam seal ring (1) is provided with a steam seal body (11), and the inner cavity of the steam seal body (11) is provided with a connecting groove (12). The surface of the connecting body (2) is slidably connected to the inner wall of the connecting groove (12).

7. A composite comb-tooth steam seal according to claim 6, characterized in that: A damping telescopic rod (13) is fixedly connected to the inner wall of the connecting groove (12). One end of the damping telescopic rod (13) is fixedly connected to the connecting body (2). A relief spring (14) is sleeved on the surface of the damping telescopic rod (13). One end of the relief spring (14) is fixedly connected to the inner wall of the connecting groove (12), and the other end of the relief spring (14) is fixedly connected to the surface of the connecting body (2).

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