A kind of anti-sticking wave tooth sealing device of steam turbine rotor

Abstract

The utility model relates to a steam turbine sealing technical field especially, and a kind of anti-jamming wave tooth sealing device of steam turbine rotor, including the steam seal body of steam turbine, further including the steam seal ring arc section being set on steam seal body, the inner arc wall of each steam seal ring arc section is uniformly provided with wave tooth, and the wave tooth head and tail link presents the wave ring of ring shape.This utility model mainly provides a steam seal ring arc section with wave tooth, combine conventional high tooth and low tooth in prior art, both can realize the steam turbine rotor shaft end steam pressure sealing effect of conventional, while also can inhibit the half-frequency vortex caused by steam flow around rotor shaft end circumferential flow due to rotor shaft end high-speed rotation, can realize the effect of reducing rotor operation vibration and reducing the rubbing loss between rotor and steam seal, effectively solve the rotor jitter and sealing device friction loss caused by half-frequency vortex caused by steam circumferential flow and rotor interaction in prior art.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine sealing technology, and in particular to an anti-jamming wave tooth sealing device for steam turbine rotors. Background Technology

[0002] Existing steam sealing devices for turbine rotor shaft end sealing increase the difficulty of steam escaping from the rotation gap by setting annular steps or annular grooves at the rotor shaft end with high and low teeth, thus providing a certain sealing and pressure-maintaining effect for the turbine. However, although this sealing method is mature and has a significant sealing effect, it lacks the ability to suppress the half-frequency eddy currents caused by the high-speed rotation of the rotor inducing the steam to move along its circumference.

[0003] The semi-frequency eddy currents caused by the interaction between the circumferential steam flow and the rotor will cause the rotor to vibrate. The gap between the high and low teeth of the steam seal ring and the rotor shaft end is very small, which will cause friction between the high and low teeth of the steam seal ring and the rotor. This will not only cause wear and tear on equipment parts, but also cause the steam seal device to gradually lose its sealing function.

[0004] In summary, in order to solve the above-mentioned technical problems, a toothed sealing device for preventing jamming of steam turbine rotors is proposed. Utility Model Content

[0005] In view of the problems of rotor vibration and friction loss of sealing device caused by half-frequency eddy current induced by the interaction between steam circumferential flow and rotor in the above or existing technologies, this utility model is proposed.

[0006] Therefore, the purpose of this utility model is to provide an anti-jamming wave tooth sealing device for a steam turbine rotor.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a steam turbine rotor anti-jamming wave tooth sealing device, including a steam turbine seal body, and a steam seal ring arc segment disposed on the steam seal body; the steam seal body is annular, and the steam seal ring arc segments are distributed in a ring array about the axis of the steam seal body, and are spliced ​​to form a complete annular steam seal ring, each of the inner arc walls of the steam seal ring arc segment is provided with wave teeth, and the wave teeth are connected end to end to form an annular wave ring, the wave teeth are perpendicular to the inner arc wall of the steam seal ring arc segment, and the wave ring is coaxial with the steam seal body.

[0008] As a preferred embodiment of the anti-jamming wave tooth sealing device for the turbine rotor of this utility model, the cross-section of the steam seal ring arc segment is "I" shaped, the steam seal ring arc segment and the steam seal body are connected by a "T" shaped groove, and an anti-jamming groove is provided on the side of the steam seal ring arc segment away from the steam inlet direction at the groove opening on the steam seal body. The anti-jamming groove is annular and coaxial with the steam seal body.

[0009] As a preferred embodiment of the anti-jamming wave tooth sealing device for the turbine rotor of this utility model, each arc segment of the steam seal ring is further provided with high teeth and low teeth on its inner ring wall, and the high teeth and low teeth on the steam seal ring are respectively spliced ​​into high tooth ring and low tooth ring.

[0010] As a preferred embodiment of the anti-jamming wave tooth sealing device for the turbine rotor of this utility model, the high tooth ring and the low tooth ring are alternately distributed along the axial direction of the steam seal ring, and a wave ring is provided between adjacent high tooth rings and low tooth rings.

[0011] The beneficial effects of the anti-jamming wave-tooth sealing device for steam turbine rotors of this utility model are as follows: This utility model mainly provides a steam seal ring arc segment with wave-tooth, which, combined with the conventional high-tooth and low-tooth in the prior art, can not only achieve the conventional steam pressure sealing effect at the end of the steam turbine rotor shaft, but also suppress the half-frequency eddy current caused by the circumferential flow of steam around the end of the rotor shaft due to the high-speed rotation of the rotor shaft. It can reduce the vibration of the rotor operation and reduce the friction loss between the rotor and the steam seal, effectively solving the problem of rotor vibration and friction loss of the sealing device caused by the interaction between the circumferential flow of steam and the rotor in the prior art. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments 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.

[0013] Figure 1 This is a structural breakdown diagram of the anti-jamming wave tooth seal device for a steam turbine rotor.

[0014] Figure 2 for Figure 1 A schematic diagram of a local part of the structure.

[0015] Figure 3 This is a structural diagram of the joint between the two arc segments of the steam seal ring.

[0016] In the diagram: 100, steam seal body; 200, steam seal ring arc segment; 2001, anti-jamming groove; 201, wave-shaped tooth; 202, high tooth; 203, low tooth. Detailed Implementation

[0017] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0018] Example, refer to Figures 1-3This embodiment provides an anti-jamming wave tooth seal device for a steam turbine rotor. By suppressing the half-frequency whirl at the rotor shaft end, it can reduce rotor operating vibration and reduce friction loss between the rotor and the steam seal.

[0019] refer to Figure 1 The structure includes a steam seal body for the steam turbine, and also includes steam seal ring arc segments 200 disposed on the steam seal body. The steam seal body is annular, and the steam seal ring arc segments 200 are distributed in a circular array about the axis of the steam seal body, and are spliced ​​together to form a complete annular steam seal ring. (Refer to...) Figure 2 Each steam seal ring arc segment 200 has a wave-shaped tooth 201 on its inner arc wall, and the wave-shaped tooth 201 is connected end to end to form a circular wave ring. The wave-shaped tooth 201 is perpendicular to the inner arc wall of the steam seal ring arc segment 200, and the wave ring is coaxial with the steam seal body.

[0020] In terms of specific structure, each steam seal ring arc segment 200 is also provided with high teeth 202 and low teeth 203 on its inner ring wall. The high teeth 202 and low teeth 203 on the steam seal ring are respectively spliced ​​into high tooth 202 rings and low tooth 203 rings. The high tooth 202 rings and low tooth 203 rings are alternately distributed along the axial direction of the steam seal ring, and a wave ring is provided between adjacent high tooth 202 rings and low tooth 203 rings.

[0021] This utility model provides an anti-jamming wave-tooth sealing device for a steam turbine rotor. It primarily provides a steam seal ring arc segment 200 with wave-tooth 201, combined with conventional high-tooth 202 and low-tooth 203 in the prior art. This not only achieves the conventional steam pressure sealing effect at the turbine rotor shaft end, but also suppresses the half-frequency eddy currents caused by the circumferential flow of steam around the rotor shaft end due to high-speed rotation of the rotor shaft end. This further suppresses the resonance phenomenon caused by half-frequency eddy currents during high-speed rotor operation. When rotor vibration is reduced, the scraping between the rotor and the steam seal will be significantly reduced, thereby extending the equipment's service and maintenance cycle and ensuring the reliability of the steam turbine seal.

[0022] The working principle of the wave-shaped tooth 201 is that the wave-shaped tooth 201 not only has a projected area along the axial direction of the steam seal body 100, but also has a projected area in the tangential direction of the steam seal body 100. Therefore, the wave-shaped tooth 201 not only blocks the steam flow along the rotor axis on the surface of the rotor shaft, but also suppresses the steam flow along the circumferential direction of the rotor (it needs to work in conjunction with the conventional high tooth 202, low tooth 203 and the corresponding annular structure on the rotor shaft end). When the steam flows through the wave-shaped tooth, the steam flow will form a steam layer on the rotor surface under the drive of the rotor. The steam layer rotates at high speed under the drive of the rotor, which will affect the rotor to generate half-frequency eddy. Secondly, the rotation speed of the steam layer in the circumferential direction is much greater than the speed in the axial direction. By utilizing the high-speed movement of the steam layer, friction is formed with the steam seal. While effectively reducing the half-frequency eddy, the friction between the steam and the steam seal can also be increased, converting kinetic energy into heat energy, increasing the pressure in the steam seal chamber, thereby preventing steam leakage.

[0023] To achieve the above-mentioned objectives, this utility model also provides the following technical details:

[0024] refer to Figure 2 and Figure 3 The cross-section of the steam seal ring arc segment 200 is "I" shaped. The steam seal ring arc segment 200 and the steam seal body are connected by a "T" shaped groove. On the side of the steam seal ring arc segment 200 away from the steam inlet direction, an anti-jamming groove 2001 is provided at the groove opening on the steam seal body. The anti-jamming groove 2001 is annular and coaxial with the steam seal body.

[0025] In the prior art, the steam seal ring arc segment 200 is pressed by an elastic element. When the rotor shaft end rubs against the steam seal, the steam seal ring arc segment 200 can avoid "hard collision" by compressing the elastic element to reduce the rubbing loss. Obviously, if the steam seal ring can retract more smoothly into the steam seal body 100, the rubbing loss will be relatively smaller. The pressure on the steam inlet side will push the steam seal ring arc segment 200 to the other side, causing the steam inlet back side of the steam seal ring arc segment 200 to slide and rub against the steam seal body 100. Therefore, by opening an anti-jamming groove 2001 on the steam seal ring arc segment 200 at the corresponding friction position to reduce the contact area and reduce the frictional resistance of the steam seal ring arc segment 200 when it retracts under pressure, this is a compensation technique to reduce the structural loss of the steam seal in conjunction with the wave tooth 201.

[0026] In summary, this utility model mainly provides a steam seal ring arc segment 200 with wave-shaped teeth 201. Combined with the conventional high teeth 202 and low teeth 203 in the prior art, it can not only achieve the conventional steam pressure sealing effect at the turbine rotor shaft end, but also suppress the half-frequency eddy current caused by the circumferential flow of steam around the rotor shaft end due to the high-speed rotation of the rotor shaft end. It can reduce rotor operating vibration and reduce the friction loss between the rotor and the steam seal, effectively solving the problem of rotor vibration and friction loss of the sealing device caused by the interaction between the circumferential flow of steam and the rotor in the prior art.

[0027] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A steam turbine rotor anti-jamming toothed sealing device, comprising a steam turbine seal body (100), characterized in that, It also includes a steam seal ring arc segment (200) disposed on the steam seal body (100); The steam seal body (100) is annular, and the steam seal ring arc segments (200) are arranged in a ring array about the axis of the steam seal body (100) and spliced ​​together to form a complete annular steam seal ring. Each steam seal ring arc segment (200) has a wave tooth (201) on its inner arc wall, and the wave tooth (201) is connected end to end to form a wave ring. The wave tooth (201) is perpendicular to the inner arc wall of the steam seal ring arc segment (200), and the wave ring is coaxial with the steam seal body (100). The cross-section of the steam seal ring arc segment (200) is "I" shaped. The steam seal ring arc segment (200) and the steam seal body (100) are connected by a "T" shaped groove. On the side of the steam seal ring arc segment (200) away from the steam inlet direction, an anti-jamming groove (2001) is provided at the groove opening on the steam seal body (100). The anti-jamming groove (2001) is annular and coaxial with the steam seal body (100).

2. The anti-jamming wave tooth sealing device for a steam turbine rotor as described in claim 1, characterized in that: Each of the gas seal ring arc segments (200) is also provided with high teeth (202) and low teeth (203) on its inner ring wall. The high teeth (202) and low teeth (203) on the gas seal ring are respectively spliced ​​into high tooth (202) ring and low tooth (203) ring.

3. The anti-jamming toothed sealing device for a steam turbine rotor as described in claim 2, characterized in that: The high-tooth (202) ring and the low-tooth (203) ring are alternately distributed along the axial direction of the steam seal ring, and a wave-shaped ring is provided between adjacent high-tooth (202) rings and low-tooth (203) rings.

Images