A reverse hedge type steam seal body of a continuous disturbance high-tooth structure and a steam seal
By introducing continuous turbulence high teeth and turbulence teeth into the steam seal structure, the problems of steam leakage and rotor shaft cross-movement in the traditional steam seal structure are solved, achieving a more efficient sealing effect and ensuring the safe and stable operation of the steam turbine.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHIWEI POWER WUXI CO LTD
- Filing Date
- 2025-08-08
- Publication Date
- 2026-07-10
AI Technical Summary
Traditional steam seal structures cannot effectively reduce steam leakage and rotor shaft axial movement during turbine operation, affecting unit efficiency and safety.
The reverse-flush steam seal body adopts a continuous turbulence high-tooth structure. By setting turbulence teeth and steam seal channels on the high teeth, a continuous turbulence structure is formed, which controls the steam flow in stages, consumes the steam kinetic energy, reduces the amount of steam leakage, and stabilizes the rotor shaft operation.
It significantly improves the sealing performance of the steam seal, reduces steam leakage, ensures stable operation of the rotor shaft, and enhances the safety and efficiency of the steam turbine.
Smart Images
Figure CN224478965U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of steam turbine sealing technology, specifically to a reverse counter-impact steam seal body and steam seal with a continuous turbulence high tooth structure. Background Technology
[0002] With the acceleration of industrialization, steam turbines, as core equipment in modern power and industrial production, have a direct impact on energy utilization and production costs due to their efficiency and reliability. Steam seals, as a key component of steam turbines, primarily function to reduce steam leakage between moving and stationary parts, thereby improving the unit's thermal efficiency and safety. Although steam seal technology has made some progress, it still faces many challenges in practical applications. Traditional steam seal structures, such as curved diameter steam seals, carbon precision steam seals, and water seals, can reduce steam leakage to some extent, but with changes in operating conditions and long-term operation, the performance of these traditional steam seals gradually fails to meet the high efficiency and high reliability requirements of modern steam turbines. During turbine operation, when high-pressure steam flows along the rotor surface to the low-pressure side, it causes cross-rotation of the main shaft, which not only affects the tightness of the steam seals but also seriously jeopardizes the safe operation of the steam turbine. Utility Model Content
[0003] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a reverse counter-impact steam seal body and steam seal with a continuous turbulence high tooth structure, which can effectively reduce the problem of rotor shaft cross-movement and significantly improve the sealing performance.
[0004] One of the objectives of this utility model is to provide a reverse-flush steam seal body with a continuous turbulence high-tooth structure, which is achieved by the following technical solution:
[0005] A reverse-flush steam seal body with a continuous turbulence high-tooth structure, characterized in that it includes an inner ring wall, the inner ring wall is radially provided with high teeth, the high teeth are provided with several turbulence teeth, the turbulence teeth include straight turbulence teeth;
[0006] It also includes a steam seal channel, which is formed on the high-pressure side. A main chamber is formed in the steam seal channel. An energy-consuming chamber is formed on the side of the main chamber near the high-pressure end. An anti-flush chamber is formed on the side of the main chamber near the low-pressure end. A chamber inlet is formed at the bottom of the main chamber.
[0007] In one of the objectives of this utility model, as an optional embodiment, the energy-consuming chamber has an energy-consuming channel that connects the energy-consuming chamber to the inner ring wall; the counter-current chamber has a counter-current channel that connects the counter-current chamber to the inner ring wall, and the counter-current channel is arranged at a reverse inclination.
[0008] In one of the objectives of this utility model, as an optional embodiment, both the energy-consuming chamber and the counter-current chamber are provided with small interfering moving teeth;
[0009] An energy-consuming inlet guide tooth is provided at the inlet of the energy-consuming channel, and an anti-flushing inlet guide tooth is provided at the inlet of the anti-flushing channel; a gradually narrowing jet structure is formed at the inlet of the anti-flushing channel.
[0010] In one of the objectives of this utility model, as an optional embodiment, the high tooth has a front tooth surface, and the turbulence tooth is disposed on the front tooth surface of the high tooth.
[0011] In one of the objectives of this utility model, as an optional embodiment, the high tooth has a tooth root, a tooth body and a tooth tip, and the turbulence tooth is disposed on the surface of the tooth root.
[0012] In one of the objectives of this utility model, as an optional embodiment, the turbulence tooth is disposed on the tooth body surface.
[0013] In one of the objectives of this utility model, as an optional embodiment, the turbulence tooth further includes oblique guide teeth.
[0014] In one of the objectives of this utility model, as an optional implementation, the distribution density of the turbulence teeth increases or decreases along the direction from the tooth body to the tooth root.
[0015] In one of the objectives of this utility model, as an optional embodiment, the inner ring wall is provided with a turbulence groove, which is located near the front tooth surface of the high tooth; the number of turbulence grooves is several.
[0016] The second objective of this utility model is to provide a reverse-flush steam seal with a continuous turbulence high-tooth structure, which is achieved by the following technical solution:
[0017] A reverse-flush steam seal with a continuous turbulence high-tooth structure, characterized in that it includes a reverse-flush steam seal body with a continuous turbulence high-tooth structure as described in any one of the objectives of this utility model.
[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0019] This invention's continuous turbulence high-tooth structure reverse-impact steam seal body reduces the kinetic energy of the main steam flow through the impacting channel, thereby reducing the shear force of the main steam flow on the main shaft, reducing shaft axial movement, ensuring stable rotor shaft operation, and guaranteeing safe turbine operation. Furthermore, by setting turbulence teeth on the high teeth to disturb the local flow field, steam leakage is further reduced. The multiple turbulence teeth set along the tooth height direction of the high teeth form a continuous turbulence structure. Each time the steam passes through a stage of turbulence teeth, it is locally disturbed, and its kinetic energy is gradually attenuated. Through the combination of the steam seal channel and the high teeth of the continuous turbulence structure, steam flow is controlled in stages and with precision, thus significantly improving sealing efficiency. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the reverse counter-impact steam seal body of the continuous turbulence high-tooth structure in Example 1.
[0021] In the diagram: 10. Inner ring wall; 11. High tooth; 12. Turbulence tooth; 13. Turbulence groove; 21. Energy dissipation chamber; 211. Energy dissipation channel; 212. Energy dissipation inlet guide tooth; 22. Counter-current chamber; 221. Counter-current channel; 222. Counter-current inlet guide tooth; 23. Disturbance tooth; 30. Rotor shaft. Detailed Implementation
[0022] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Unless otherwise specified, the materials and equipment used in this embodiment are all commercially available. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0023] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.
[0024] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0025] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or apparatus.
[0026] Example 1:
[0027] Please refer to Figure 1 This embodiment provides a reverse-flush steam seal body with a continuous turbulence high-tooth structure. The outer side of the reverse-flush steam seal body with a continuous turbulence high-tooth structure is used to connect with the turbine cylinder, and the inner side is used to be sleeved on the rotor shaft 30 circumferentially.
[0028] In this embodiment, the inner side of the reverse-flush steam seal body of the continuous turbulence high-tooth structure has an inner ring wall 10, which is used to cooperate with the rotor shaft 30. The inner ring wall 10 has a high-pressure end and a low-pressure end at its two ends, respectively. The high-pressure end is the end closer to the high-pressure steam, and the low-pressure end is the end farther away from the high-pressure steam.
[0029] The inner ring wall 10 is radially provided with high teeth 11, and the high teeth 11 are provided with minor interference flow teeth 12;
[0030] The reverse-flush steam seal body of the continuous turbulence high-tooth structure in this embodiment also includes a steam seal channel. The steam seal channel is formed on one side of the high tooth 11. A main chamber is formed in the steam seal channel. An energy-consuming chamber 21 is formed on the side of the main chamber near the high-pressure end. An anti-flush chamber 22 is formed on the side of the main chamber near the low-pressure end. A chamber inlet is formed at the bottom of the main chamber.
[0031] Based on the above structure, during use, the main steam stream is converted into a radial steam stream by the boss on the rotor shaft 30. A portion of the radial steam stream enters the main chamber through the chamber inlet and forms a first steam branch and a second steam branch. The first steam branch enters the energy-consuming chamber 21 towards the high-pressure end, while the second steam branch enters the anti-fluid chamber 22 towards the low-pressure end. The other portion of the radial steam stream flows axially along the boss. This portion of the flow encounters the fluid in the anti-fluid chamber 22 head-on on the boss. The steam through the anti-fluid channel 221 reduces the kinetic energy of the main steam stream, thereby reducing the shear force of the main steam stream on the main shaft and reducing the axial movement of the main shaft. This ensures stable operation of the rotor shaft 30 and guarantees safe operation of the steam turbine. After the main steam flow loses most of its kinetic energy through the steam seal channel, it generates turbulence under the guidance of the high teeth 11, further hindering the flow. The turbulence teeth 12 set on the high teeth 11 further reduce steam leakage by disturbing the local flow field. The multiple turbulence teeth 12 set along the tooth height direction of the high teeth 11 form a continuous turbulence structure. The steam is locally disturbed every time it passes through a stage of turbulence teeth, and its kinetic energy is gradually reduced. Through the combination of the steam seal channel and the high teeth 11 with the continuous turbulence structure, the steam flow is controlled in stages and with precision, thereby significantly improving the sealing efficiency.
[0032] Specifically, in this embodiment, the energy-consuming chamber 21 has an energy-consuming channel 211, which connects the energy-consuming chamber 21 to the inner ring wall 10, allowing the first steam branch to connect with the main steam stream. The counter-current chamber 22 has a counter-current channel 221, which connects the counter-current chamber 22 to the inner ring wall 10, and the counter-current channel 221 is inclined in the opposite direction. By tilting the counter-current channel 221 towards the high-pressure end, the second steam branch forms a counter-current flow effect with the main steam stream through the counter-current channel 221, greatly consuming the kinetic energy of the main steam stream and improving the sealing efficiency of the steam seal. The steam through the counter-current channel 221 reduces the kinetic energy of the main steam stream, thereby reducing the shear force of the main steam stream on the main shaft, reducing the axial movement of the main shaft, ensuring the stable operation of the rotor shaft 30 and extending the service life of the equipment, thus ensuring the safe operation of the steam turbine.
[0033] Both the energy-consuming chamber 21 and the counter-current chamber 22 are provided with small perturbation teeth 23. The small perturbation teeth 23 are evenly distributed on the inner wall of the energy-consuming chamber 21 or the counter-current chamber 22 by fixing the root of the perturbation teeth 23 to the inner wall of the energy-consuming chamber 21 or the counter-current chamber 22. The perturbation teeth 23 can be straight teeth, oblique teeth, or a combination of straight teeth and oblique teeth. The perturbation teeth 23 cause the first steam branch in the energy-consuming chamber 21 and the second steam branch in the counter-current chamber 22 to form local vortices, thereby accelerating the dissipation of the kinetic energy of the steam.
[0034] Furthermore, an energy-consuming inlet guide tooth 212 is provided at the inlet of the energy-consuming channel 211, and an energy-consuming outlet guide tooth is provided at the outlet of the energy-consuming channel 211. By providing the energy-consuming inlet guide tooth 212, a large vortex is formed in the first steam branch in the energy-consuming chamber 21. By providing the energy-consuming outlet guide tooth, the first steam branch flows out of the left energy-consuming chamber 21 under the guiding action of the energy-consuming outlet guide tooth, and re-enters the main stream to reach the left side of the rotor shaft 30 boss to form a radial steam flow and repeat the above flow state.
[0035] The inlet of the counter-current channel 221 is provided with counter-current inlet guide teeth 222, and the outlet of the counter-current channel 221 is provided with counter-current outlet front guide teeth and counter-current outlet rear guide teeth; a tapered jet structure is formed at the inlet of the counter-current channel 221. That is, an asymptotic surface is formed inside the counter-current chamber 22 that gradually approaches the counter-current inlet guide teeth 222, thereby gradually reducing the distance between the inner wall of the counter-current chamber 22 and the counter-current inlet guide teeth 222, thus forming a tapered jet structure at the inlet of the counter-current channel 221. Under the action of the tapered jet structure, the second steam branch accelerates its flow into the counter-current channel 221, improving the reverse counter-current capability.
[0036] In this embodiment, the high tooth 11 has a front tooth surface and a rear tooth surface, and the turbulence-disrupting tooth 12 is disposed on the front tooth surface of the high tooth 11. Of course, the turbulence-disrupting tooth 12 can also be disposed on the rear tooth surface of the high tooth 11, and those skilled in the art can implement it according to actual needs.
[0037] The high tooth 11 has a tooth root, a tooth body, and a tooth tip, and the turbulence-disrupting tooth 12 is disposed near the tooth root. A plurality of the turbulence-disrupting teeth 12 are disposed along the direction from the tooth body to the tooth root to form a multi-stage continuous turbulence structure.
[0038] The aforementioned turbulence-inducing teeth 12 may be equidistantly arranged on the high teeth 11 or non-equidistantly arranged on the high teeth 11. The distribution density of the turbulence-inducing teeth 12 (i.e., the distance distribution between the turbulence-inducing teeth) may increase along the direction from the tooth body to the tooth root, decrease along the direction from the tooth body to the tooth root, or be randomly arranged.
[0039] The height and thickness of the turbulence-inducing teeth 12 can also be set according to actual needs. For example, dense small turbulence-inducing teeth can be arranged at the root of the high tooth 11 to deal with high pressure and low velocity flow; sparse large turbulence-inducing teeth can be arranged at the body of the high tooth 11 to control low pressure and high velocity flow. By setting turbulence-inducing teeth of different densities, heights or thicknesses on the high tooth 11, it can adapt to changes in steam pressure and velocity to achieve segmented dynamic response.
[0040] The turbulence-inducing teeth in this embodiment can be straight turbulence-inducing teeth, oblique turbulence-inducing teeth, or a combination of both. The cross-sectional shape of the turbulence-inducing teeth can be rectangular, sawtooth, arc-shaped, or other irregular protrusions.
[0041] Furthermore, in this embodiment, the inner ring wall 10 of the continuously turbulent high-tooth structure reverse-impact steam seal body is provided with several turbulence grooves 13, which are located near the front tooth surface of the high teeth 11. The turbulence grooves 13 disrupt the laminar flow state of the steam, generate controllable vortices, and disperse the steam in multiple directions, making the pressure distribution at the tooth root more uniform.
[0042] Example 2:
[0043] This embodiment provides a reverse-flush steam seal with a continuous turbulence high-tooth structure based on Embodiment 1, including the reverse-flush steam seal body with a continuous turbulence high-tooth structure as described in Embodiment 1, and its supporting components.
[0044] The reverse-flush steam seal body with a continuous turbulence high-tooth structure is the core component for performing the sealing function of the reverse-flush steam seal with a continuous turbulence high-tooth structure. Supporting components may include support structures, adjustment mechanisms, auxiliary systems or monitoring interfaces, etc., to support the realization of the function of the steam seal body.
[0045] Although certain components and embodiments of this application have been illustrated and described, many modifications and alterations (e.g., variations in the size, dimensions, structure, shape and proportion of the various elements, installation arrangement, material use, color, orientation, etc.) will be conceived by those skilled in the art without actually departing from the scope and spirit of the claims.
[0046] Finally, it should be noted that the above embodiments are only preferred embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.
Claims
1. A reverse-flush steam seal body with a continuous turbulence high-tooth structure, characterized in that, Includes an inner ring wall, the inner ring wall being radially provided with high teeth, the high teeth being provided with several turbulent flow teeth, the turbulent flow teeth including straight turbulent flow teeth; It also includes a steam seal channel, which is formed on the high-pressure side. A main chamber is formed in the steam seal channel. An energy-consuming chamber is formed on the side of the main chamber near the high-pressure end. An anti-flush chamber is formed on the side of the main chamber near the low-pressure end. A chamber inlet is formed at the bottom of the main chamber.
2. The reverse-flush steam seal body with a continuous turbulence high-tooth structure according to claim 1, characterized in that, The energy-consuming chamber has an energy-consuming channel that connects the energy-consuming chamber to the inner ring wall; the counter-current chamber has a counter-current channel that connects the counter-current chamber to the inner ring wall, and the counter-current channel is inclined in the opposite direction.
3. The reverse-flush steam seal body with a continuous turbulence high-tooth structure according to claim 2, characterized in that, Both the energy-consuming chamber and the counter-current chamber are equipped with small interfering moving teeth; An energy-consuming inlet guide tooth is provided at the inlet of the energy-consuming channel, and an anti-flushing inlet guide tooth is provided at the inlet of the anti-flushing channel; a gradually narrowing jet structure is formed at the inlet of the anti-flushing channel.
4. The reverse-flush steam seal body with a continuous turbulence high-tooth structure according to claim 1, characterized in that, The high tooth has a front tooth surface, and the turbulence tooth is disposed on the front tooth surface of the high tooth.
5. The reverse-flush steam seal body with a continuous turbulence high-tooth structure according to claim 4, characterized in that, The high tooth has a tooth root, a tooth body and a tooth tip, and the turbulence tooth is disposed on the surface of the tooth root.
6. The reverse-flush steam seal body with a continuous turbulence high-tooth structure according to claim 5, characterized in that, The turbulence-inducing teeth are disposed on the surface of the tooth body.
7. The reverse-flush steam seal body with a continuous turbulence high-tooth structure according to claim 6, characterized in that, The turbulence-disrupting teeth also include oblique turbulence-disrupting teeth.
8. The reverse-flush steam seal body with a continuous turbulence high-tooth structure according to claim 6, characterized in that, The distribution density of the turbulence-causing teeth increases or decreases along the direction from the tooth body to the tooth root.
9. The reverse-flush steam seal body with a continuous turbulence high-tooth structure according to claim 4, characterized in that, The inner ring wall is provided with a turbulence groove, which is located near the front tooth surface of the high tooth; the number of turbulence grooves is several.
10. A reverse-flush steam seal with a continuous turbulence high-tooth structure, characterized in that, Including the reverse-flush steam seal body with a continuous turbulence high-tooth structure as described in any one of claims 1-9.