A kind of split chamber structure's steam seal body and steam seal
The steam seal body with a split-chamber structure adopts a support column and flow guide design, which solves the problem of limited sealing effect of traditional steam seal structures under high pressure and high temperature conditions. The support column divides the energy dissipation chamber into an independent first energy dissipation chamber and a second energy dissipation chamber. This solves the problem of limited sealing effect of traditional steam seal structures under high pressure and high temperature conditions, and achieves a better sealing effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHIWEI POWER WUXI CO LTD
- Filing Date
- 2025-07-09
- Publication Date
- 2026-07-10
AI Technical Summary
Traditional steam seal structures have limited sealing performance under high pressure and high temperature conditions, leading to serious steam leakage, which affects efficiency and wastes energy.
The steam seal body adopts a split-chamber structure, which divides the energy dissipation chamber into an independent first energy dissipation chamber and a second energy dissipation chamber through the support column. It also uses the design of guide teeth and turbulence teeth to divide and guide the high-pressure steam flow, increase the steam flow resistance and turbulence, and reduce leakage.
It effectively reduces steam leakage, increases steam flow resistance and turbulence, consumes steam energy, and improves sealing performance.
Smart Images
Figure CN224478959U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a steam turbine seal, and more specifically, to a steam seal body and a steam seal with a flow-diverting chamber structure. Background Technology
[0002] Steam turbines are devices that convert thermal energy into mechanical energy and are widely used in power plants and industrial drives. Steam leakage in steam turbines is a common problem, leading to decreased efficiency and energy waste. Traditional steam seal structures typically employ a single-channel design, which, while reducing steam leakage to some extent, has limited sealing effectiveness under high pressure and high temperature conditions. Therefore, a new type of steam seal is needed that can provide better sealing performance under a wider range of operating conditions. Utility Model Content
[0003] The purpose of this utility model is to address the shortcomings of the prior art by providing a steam seal body and steam seal with a compact structure and a flow-diverting chamber structure.
[0004] The technical solution of this utility model is implemented as follows: a steam seal body with a flow-dividing chamber structure, wherein a steam seal portion is provided on the inner end face. The steam seal portion includes a first guide tooth opposite to the high-pressure gas and an energy dissipation chamber located behind the first guide tooth, wherein the inlet of the energy dissipation chamber is opposite to the front end face of the external rotor boss.
[0005] A support column is integrally formed at the bottom of the chamber corresponding to the inlet of the energy dissipation chamber, and a dividing tooth is integrally formed at the free end of the support column; the energy dissipation chamber is divided into an independent first energy dissipation chamber and a second energy dissipation chamber by the support column, and the dividing tooth divides the high-pressure steam flow guided by the front end face of the external rotor boss into two streams and introduces them into the first energy dissipation chamber and the second energy dissipation chamber respectively.
[0006] A steam turbine seal with a split-chamber structure includes the aforementioned seal body.
[0007] In the steam seal with the above-mentioned flow-dividing chamber structure, the free end of the support column is flush with the inner end face of the steam seal body, and the inlet of the energy dissipation chamber is divided by the support column to form the inlet of the first energy dissipation chamber and the inlet of the second energy dissipation chamber.
[0008] In the steam seal with the above-mentioned flow-dividing chamber structure, the free end of the dividing tooth is located on the rear side of the inner end face of the steam seal body, and the inner wall of the inlet of the energy dissipation chamber is respectively matched with the guide slope of the dividing tooth to form the inlet of the first energy dissipation chamber and the inlet of the second energy dissipation chamber.
[0009] In the steam seal of the above-mentioned flow-dividing chamber structure, a second guide tooth is provided in the first energy dissipation chamber on the inlet side of the first energy dissipation chamber.
[0010] In the steam seal of the above-mentioned flow-dividing chamber structure, a third guide tooth is integrally formed on the inner end face of the steam seal body at the outlet of the first energy dissipation chamber. The third guide tooth and the first guide tooth cooperate to form a first outlet guide channel.
[0011] In the steam seal of the above-mentioned flow-dividing chamber structure, a number of first turbulence teeth are distributed at intervals along the gas flow direction at the inlet of the energy dissipation chamber and in the first and second energy dissipation chambers.
[0012] In the steam seal of the above-mentioned flow-dividing chamber structure, the first turbulence tooth is a reverse turbulence tooth, and the free end of each first turbulence tooth is inclined towards the direction of gas flow.
[0013] In the aforementioned steam seal with a split-chamber structure, the inner end faces of the steam seal body on both sides of the outlet of the second energy dissipation chamber are integrally formed with fourth guide teeth. Two opposing fourth guide teeth cooperate to form a second outlet guide channel. The second outlet guide channel is located above the corresponding external rotor boss and is inclined towards the direction of the high-pressure steam flow. A second turbulence tooth is provided on the front side of the fourth guide tooth along the direction of the high-pressure steam flow. The second turbulence tooth is inclined towards the direction of the high-pressure steam flow, and the lower end of the second turbulence tooth is on the same plane as the lower end of the fourth guide tooth.
[0014] In the steam seal of the above-mentioned flow-dividing chamber structure, the first guide tooth is provided with a turbulence step on the back of the front end of the first energy dissipation chamber outlet.
[0015] After adopting the above structure, the main steam flow after entering the steam seal section through the first guide tooth is guided by the front end face of the external rotor boss and then divided into two streams. Most of the steam forms a radial main flow and enters the energy dissipation chamber. It is then guided by the dividing tooth to be divided into two parts again and enter the first energy dissipation chamber and the second energy dissipation chamber respectively. The other part forms an axial main flow and flows to the low-pressure end.
[0016] The steam flow in the first energy dissipation chamber flows out from the back of the first guide tooth, blocking and colliding with the main steam flow to dissipate energy. The steam flow in the second energy dissipation chamber flows out from the outlet and collides with the main axial flow above the boss to dissipate energy. This effectively increases the resistance and turbulence of the steam flow, effectively reduces the steam flow velocity, consumes the energy carried by the steam flow, and reduces steam leakage. Attached Figure Description
[0017] The present invention will be further described in detail below with reference to the embodiments shown in the accompanying drawings, but this does not constitute any limitation on the present invention.
[0018] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model;
[0019] Figure 2 This is a partial structural diagram of point A of this utility model;
[0020] Figure 3 This is a structural schematic diagram of Embodiment 2 of the present invention;
[0021] Figure 4 This is a partial structural diagram of part B of this utility model.
[0022] In the figure: 1. Steam seal body; 2. Steam seal section; 3. First guide tooth; 4. Support column; 5. Dividing tooth; 6. First energy dissipation chamber; 7. Second energy dissipation chamber; 8. Second guide tooth; 9. Third guide tooth; 10. First outlet guide channel; 11. First turbulence tooth; 12. Fourth guide tooth; 13. Second outlet guide channel; 14. Second turbulence tooth; 15. Turbulence step section. Detailed Implementation
[0023] Example 1
[0024] See Figure 1-2 As shown, the present invention discloses a steam seal body with a flow-dividing chamber structure, characterized in that a steam seal portion 2 is provided on the inner end face. The steam seal body includes an outer ring for cooperating with the turbine cylinder block and an inner ring for cooperating with the rotor shaft, wherein the steam seal portion is disposed on the inner ring.
[0025] The steam seal 2 includes a first guide tooth 3 opposite to the high-pressure gas and an energy dissipation chamber located behind the first guide tooth 3. The inlet of the energy dissipation chamber is opposite to the front end face of the external rotor boss.
[0026] A support column 4 is integrally formed at the bottom of the chamber corresponding to the inlet of the energy dissipation chamber, and a dividing tooth 5 is integrally formed at the free end of the support column 4. The energy dissipation chamber is divided into an independent first energy dissipation chamber 6 and a second energy dissipation chamber 7 by the support column 4. The dividing tooth 5 divides the high-pressure steam flow guided by the front end face of the external rotor boss into two streams and introduces them into the first energy dissipation chamber 6 and the second energy dissipation chamber 7 respectively. The energy dissipation chamber is an annular chamber set in the steam seal body, and is connected to various parts of the steam seal body by the support column. A guide block is set in the second energy dissipation chamber to form a loop steam flow channel in the second energy dissipation chamber.
[0027] After entering the steam seal section through the first guide tooth, the main steam flow is guided by the front end face of the external rotor boss and splits into two streams. Most of the steam forms a radial main flow that enters the energy dissipation chamber and is then guided by the dividing tooth to split into two parts again, which enter the first energy dissipation chamber and the second energy dissipation chamber respectively. The other part forms an axial main flow that flows to the low-pressure end.
[0028] The steam flow in the first energy dissipation chamber flows out from the back of the first guide tooth, blocking and colliding with the main steam flow to dissipate energy. The steam flow in the second energy dissipation chamber flows out from the outlet and collides with the main axial flow above the boss to dissipate energy. This effectively increases the resistance and turbulence of the steam flow, effectively reduces the steam flow velocity, consumes the energy carried by the steam flow, and reduces steam leakage.
[0029] A steam seal with a flow-diverting chamber structure includes a steam seal body 1.
[0030] In this embodiment, the free end of the support column 4 is flush with the inner end face of the steam seal body 1. The inlet of the energy dissipation chamber is divided by the support column 4 to form the inlet of the first energy dissipation chamber 6 and the inlet of the second energy dissipation chamber 7. In this structure, the dividing teeth are located below the inner end face of the steam seal body. When the steam flow turns radial, it is first divided into two parts by the dividing teeth and then enters the inlet of the first energy dissipation chamber and the inlet of the second energy dissipation chamber respectively.
[0031] More preferably, a second guide tooth 8 is provided inside the first energy dissipation chamber 6 on the inlet side of the first energy dissipation chamber 6. The second guide tooth blocks and guides the steam flow entering the first energy dissipation chamber, dissipates energy through collision, increases the turbulence of the steam flow, enhances the steam sealing effect, and reduces steam leakage.
[0032] In this embodiment, preferably, a third guide tooth 9 is integrally formed on the inner end face of the steam seal body 1 at the outlet of the first energy dissipation chamber 6. The third guide tooth 9 and the first guide tooth 3 cooperate to form a first outlet guide channel 10. By extending the first outlet guide channel through the third guide tooth, the outlet is brought closer to the gap between the first guide tooth and the rotor, ensuring that the steam flow in the first energy dissipation chamber has sufficient impact force to obstruct the mainstream steam flow.
[0033] In this embodiment, the first guide tooth 3 is provided with a turbulence step 15 on the back of the front end of the outlet of the first energy dissipation chamber 6. When the main steam flows through the first guide tooth, it gradually diffuses under the action of the turbulence step, reducing the pressure of the main steam flow and improving the obstruction effect of the steam flow discharged from the outlet of the first energy dissipation chamber on the main steam flow.
[0034] Example 2
[0035] See Figure 3-4 As shown, the turbine steam seal of this utility model with a flow-dividing chamber structure is basically the same as that in Embodiment 1. The difference is that in this embodiment, the free end of the dividing tooth 5 is located on the rear side of the inner end face of the steam seal body 1. The inner wall of the inlet of the energy dissipation chamber cooperates with the guide slope of the dividing tooth 5 to form the inlet of the first energy dissipation chamber 6 and the inlet of the second energy dissipation chamber 7. With this structure, a small cavity is formed at the inlet of the energy dissipation chamber. When the steam flow turns radial and enters the small cavity, it collides with the inner wall of the cavity and the dividing tooth, forming a certain vortex in the small cavity for counter-current energy dissipation.
[0036] In this embodiment, preferably, a plurality of first turbulence teeth 11 are distributed at intervals along the gas flow direction at the inlet of the energy dissipation chamber and in the first energy dissipation chamber 6 and the second energy dissipation chamber 7. The first turbulence teeth increase the resistance encountered by the steam flow in the energy dissipation chamber, thereby improving the energy dissipation efficiency. The tooth height and tooth thickness of the first turbulence teeth are set according to the steam parameters of the steam seal environment through fluid simulation experiments. Typically, the design range for the tooth height is 0.5mm-3mm, and the design range for the tooth thickness is 0.5mm-2mm.
[0037] More preferably, the first turbulence tooth 11 is a reverse turbulence tooth, with the free end of each first turbulence tooth 11 tilted towards the direction of gas flow. With this structure, when the steam flow collides with the first turbulence tooth during its forward movement, it forms a vortex steam flow guided by the outer wall of the first turbulence tooth, enhancing the steam resistance effect. The tilt angle of the first turbulence tooth is set according to the steam parameters of the steam seal environment through fluid simulation experiments; typically, the tilt angle ranges from 10° to 90°.
[0038] In this embodiment, preferably, the inner end faces of the steam seal body on both sides of the outlet of the second energy dissipation chamber 7 are integrally formed with fourth guide teeth 12, and the two opposing fourth guide teeth 12 cooperate to form a second outlet guide channel 13; the second outlet guide channel 13 is located on the upper side of the corresponding external rotor boss and is inclined towards the direction of the high-pressure steam flow. When the steam flow flows out through the second outlet guide channel, it forms an opposing impact with the high-pressure steam flow under the guidance of the fourth guide teeth, which can effectively block the high-pressure steam flow and reduce leakage.
[0039] More preferably, a second turbulence tooth 14 is provided on the front side of the fourth guide tooth 12 along the direction of the high-pressure steam flow. The second turbulence tooth 14 is inclined towards the direction of the high-pressure steam flow, and the lower end of the second turbulence tooth 14 is on the same plane as the lower end of the fourth guide tooth 12. When the high-pressure steam flow continues to advance towards the low-pressure end through the fourth guide tooth, it enters the turbulence chamber formed by the cooperation of the fourth guide tooth and the second turbulence tooth, forming a vortex steam flow. Under the guidance of the second turbulence tooth, it flows towards the rotor and collides with the rotor surface, further increasing the degree of steam flow turbulence.
[0040] Its usage method is the same as in Example 1.
[0041] The above-described embodiments are preferred embodiments of the present utility model and are only used to facilitate the illustration of the present utility model. They are not intended to limit the present utility model in any way. Any person skilled in the art who makes partial modifications or alterations to the technical content disclosed in the present utility model without departing from the scope of the technical features of the present utility model shall still fall within the scope of the technical features of the present utility model.
Claims
1. A steam seal body with a flow-diverting chamber structure, characterized in that, An air seal (2) is provided on the inner end face; The steam seal (2) includes a first guide tooth (3) opposite to the high-pressure gas and an energy dissipation chamber located behind the first guide tooth (3). The inlet of the energy dissipation chamber is opposite to the front end face of the external rotor boss. A support column (4) is integrally formed at the bottom of the chamber corresponding to the inlet of the energy dissipation chamber, and a dividing tooth (5) is integrally formed at the free end of the support column (4); the energy dissipation chamber is divided into an independent first energy dissipation chamber (6) and a second energy dissipation chamber (7) by the support column (4), and the dividing tooth (5) divides the high-pressure steam flow guided by the front end face of the external rotor boss into two streams and introduces them into the first energy dissipation chamber (6) and the second energy dissipation chamber (7) respectively.
2. A steam seal with a flow-diverting chamber structure, characterized in that, The gas seal body (1) includes the one of claim 1.
3. The steam seal with a flow-diverting chamber structure according to claim 2, characterized in that, The free end of the support column (4) is flush with the inner end face of the steam seal body (1). The entrance of the energy dissipation chamber is divided by the support column (4) to form the entrance of the first energy dissipation chamber (6) and the entrance of the second energy dissipation chamber (7).
4. The steam seal with a flow-diverting chamber structure according to claim 2, characterized in that, The free end of the dividing tooth (5) is located on the rear side of the inner end face of the steam seal body (1). The inner wall of the inlet of the energy dissipation chamber is respectively matched with the guide slope of the dividing tooth (5) to form the inlet of the first energy dissipation chamber (6) and the inlet of the second energy dissipation chamber (7).
5. The steam seal with a flow-diverting chamber structure according to claim 3, characterized in that, A second guide tooth (8) is provided inside the first energy dissipation chamber (6) on the inlet side of the first energy dissipation chamber (6).
6. The steam seal with a flow-diverting chamber structure according to claim 2, characterized in that, The inner end face of the steam seal body (1) at the outlet of the first energy dissipation chamber (6) is integrally formed with a third guide tooth (9), and the third guide tooth (9) and the first guide tooth (3) cooperate to form the first outlet guide channel (10).
7. The steam seal with a flow-diverting chamber structure according to claim 3, characterized in that, Several first turbulence teeth (11) are distributed at intervals along the gas flow direction at the inlet of the energy dissipation chamber and in the first energy dissipation chamber (6) and the second energy dissipation chamber (7).
8. The steam seal with a flow-diverting chamber structure according to claim 7, characterized in that, The first turbulence tooth (11) is a reverse turbulence tooth, and the free end of each first turbulence tooth (11) is tilted towards the direction of the gas.
9. The steam seal with a flow-diverting chamber structure according to claim 2, characterized in that, The inner end face of the steam seal body on both sides of the outlet of the second energy dissipation chamber (7) is integrally formed with a fourth guide tooth (12), and the two opposite fourth guide teeth (12) cooperate to form a second outlet guide channel (13); the second outlet guide channel (13) is located on the upper side of the corresponding external rotor boss and is inclined towards the direction of the high pressure steam flow. The fourth guide tooth (12) has a second turbulence tooth (14) on its front side along the direction of the high-pressure steam flow. The second turbulence tooth (14) is tilted toward the direction of the high-pressure steam flow, and the lower end of the second turbulence tooth (14) is on the same plane as the lower end of the fourth guide tooth (12).
10. A steam seal with a flow-diverting chamber structure according to claim 2, characterized in that, The first guide tooth (3) is provided with a turbulence step (15) on the back of the front end of the outlet of the first energy dissipation chamber (6).