Composite flow guiding steam seal body and steam seal

Abstract

This utility model discloses a composite flow-guiding steam seal body and steam seal, belonging to the field of steam turbine steam seal technology. Its key technical features include a steam seal portion on the inner end face; the steam seal portion includes a first flow-guiding tooth, a first energy-dissipating cavity on the inner end face, the first energy-dissipating cavity having a first outlet and a second outlet, and a second energy-dissipating cavity on the front side of the first energy-dissipating cavity; the inlet of the first energy-dissipating cavity is located between the first flow-guiding tooth and the front end face of the external rotor boss, the first outlet is located between the first flow-guiding tooth and the inlet of the first energy-dissipating cavity, and the second outlet is located above the corresponding external rotor boss; both the inlet and outlet of the second energy-dissipating cavity are located above the corresponding external rotor boss, and a separating tooth is provided between the inlet and the second outlet of the second energy-dissipating cavity; this utility model aims to provide a composite flow-guiding steam seal body and steam seal with multiple steam flow channels and multiple diversion and convergence energy dissipation, used for steam turbine steam seals.

Description

Technical Field

[0001] This utility model relates to a multi-energy-saving steam seal, and more specifically, to a composite flow-guiding steam seal body and steam seal. Background Technology

[0002] During the operation of steam power equipment, the sealing effect of the steam seal has a crucial impact on the energy utilization efficiency and operational stability of the equipment. Traditional steam seal structures, such as comb-tooth steam seals, rely primarily on the tiny gaps between the teeth to increase the resistance to steam flow. However, steam can still easily leak through these gaps, leading to reduced thermal efficiency and significant energy waste. While labyrinth steam seals increase the path length of steam leakage to some extent, their complex structure and high manufacturing cost, coupled with the wear and tear on the sealing components caused by impurities carried by the steam during long-term operation, ultimately reduce sealing performance. Utility Model Content

[0003] The purpose of this utility model is to address the shortcomings of the prior art by providing a composite flow guiding steam seal body and steam seal with multiple steam flow channels, multiple diversion and convergence energy dissipation.

[0004] The technical solution of this utility model is as follows: a composite flow-guiding steam seal body, characterized in that a steam seal part is provided on the inner end face.

[0005] The steam seal includes a first guide tooth opposite to the high-pressure gas. A first energy dissipation cavity is provided on the inner end face between the first guide tooth and the corresponding external rotor boss. A first outlet and a second outlet are respectively provided at both ends of the first energy dissipation cavity in the direction of steam flow. A second energy dissipation cavity is provided on the front side of the first energy dissipation cavity in the direction of steam flow.

[0006] The first energy dissipation chamber inlet is located between the first guide tooth and the front end face of the external rotor boss, the first outlet is located between the first guide tooth and the first energy dissipation chamber inlet, and the second outlet is located above the corresponding external rotor boss; the second energy dissipation chamber inlet and outlet are both located above the corresponding external rotor boss, and a separating tooth is provided between the second energy dissipation chamber inlet and the second outlet.

[0007] The high-pressure gas moving axially enters the steam seal section through the first guide tooth, and under the guidance of the front end face of the corresponding external rotor boss, part of it turns radially outward and enters the first energy dissipation chamber, while part of it continues axially past the second outlet and enters the second energy dissipation chamber.

[0008] A composite flow-guiding steam seal, comprising a steam seal body.

[0009] The aforementioned composite flow guide steam seal also includes a rotor that passes through the steam seal body and several bosses distributed axially on the rotor.

[0010] In the aforementioned composite flow-guiding steam seal, a second flow-guiding tooth and a third flow-guiding tooth are respectively provided on both sides of the inlet of the first energy dissipation chamber; the second flow-guiding tooth cooperates with the first flow-guiding tooth to form a first outlet, and the third flow-guiding tooth cooperates with the partition tooth to form a second outlet; the second flow-guiding tooth and the third flow-guiding tooth cooperate to form a vortex groove, and the inlet of the first energy dissipation chamber is located in the vortex groove. The high-pressure gas guided by the boss first enters the vortex groove and then enters the first energy dissipation chamber.

[0011] In the aforementioned composite flow guide steam seal, both the second outlet and the second energy dissipation chamber outlet are tapered shapes that gradually decrease in size.

[0012] In the aforementioned composite flow guide steam seal, a flow divider block is provided in the first energy dissipation chamber opposite to the inlet, and flow divider bell mouths are provided on both sides of the inner end of the inlet of the first energy dissipation chamber.

[0013] In the aforementioned composite flow-guiding steam seal, the second energy dissipation chamber is provided with a fourth flow-guiding tooth on the side near the low-pressure end, and a fifth flow-guiding tooth is provided between the fourth flow-guiding tooth and the separating tooth; the fourth flow-guiding tooth and the fifth flow-guiding tooth cooperate to form the inlet of the second energy dissipation chamber, and the fifth flow-guiding tooth and the separating tooth cooperate to form the outlet of the second energy dissipation chamber.

[0014] In the aforementioned composite flow guide steam seal, a stepped portion is formed at the root of the fifth flow guide tooth, and the energy dissipation channel of the second energy dissipation chamber becomes larger after passing through the stepped portion from the inlet.

[0015] In the aforementioned composite flow-guiding steam seal, the root of the high-pressure end sidewall of the first flow-guiding tooth is provided with a turbulence-inducing tooth.

[0016] 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 boss and splits into two streams. Most of the steam forms a radial main flow and enters the first energy dissipation chamber, while the other part forms an axial main flow that flows along the gap between the boss and the first diverting tooth to the low-pressure end and enters the second energy dissipation chamber.

[0017] The radial main flow splits into two streams along the steam flow channel within the first energy dissipation chamber. One stream flows from the first outlet to the back of the first guide tooth and merges with the main steam flow. The other stream flows from the second outlet to the top of the boss and merges with the axial main flow. This effectively increases the resistance and turbulence of the steam flow, significantly reduces steam leakage, and substantially improves the energy utilization efficiency of steam power equipment, thus reducing energy waste. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0021] Figure 3 This is a partial structural diagram of point A of this utility model.

[0022] In the figure: 1. Steam seal body; 2. Rotor; 3. Boss; 4. Steam seal section; 5. First guide tooth; 6. First energy dissipation chamber; 7. First outlet; 8. Second outlet; 9. Second energy dissipation chamber; 10. Separating tooth; 11. Second guide tooth; 12. Third guide tooth; 13. Vortex groove; 14. Flow divider block; 15. Flow divider bell mouth; 16. Fourth guide tooth; 17. Fifth guide tooth; 18. Step section; 19. Turbulence tooth. Detailed Implementation

[0023] See Figure 1-3 As shown, the present invention discloses a composite flow guide steam seal body, wherein a steam seal part 4 is provided on the inner end face; the steam seal body includes an outer ring for cooperating and connecting with the turbine cylinder block, and an inner ring for cooperating with the rotor shaft, wherein the steam seal part is provided on the inner ring.

[0024] The steam seal 4 includes a first guide tooth 5 opposite to the high-pressure gas. A first energy dissipation cavity 6 is provided on the inner end face between the first guide tooth 5 and the outer rotor boss 3. The first energy dissipation cavity 6 is provided with a first outlet 7 and a second outlet 8 at both ends along the steam flow direction. A second energy dissipation cavity 9 is provided on the front side of the first energy dissipation cavity 6 along the steam flow direction.

[0025] The inlet of the first energy dissipation chamber 6 is located between the first guide tooth 5 and the front end face of the external rotor boss 3, the first outlet 7 is located between the first guide tooth 5 and the inlet of the first energy dissipation chamber 6, and the second outlet 8 is located above the corresponding boss 3; the inlet and outlet of the second energy dissipation chamber 9 are both located above the corresponding external rotor boss 3, and a separating tooth 10 is provided between the inlet of the second energy dissipation chamber 9 and the second outlet 8.

[0026] The high-pressure gas moving axially enters the steam seal section 4 through the first guide tooth 5, and under the guidance of the front end face of the corresponding external rotor boss 3, part of it turns radially outward and enters the first energy dissipation chamber 6, while part of it continues axially past the second outlet 8 and enters the second energy dissipation chamber 9.

[0027] The inlet of the first energy dissipation cavity 6 is located between the first guide tooth 5 and the front end face of the boss 3, the first outlet 7 is located between the first guide tooth 5 and the inlet of the first energy dissipation cavity 6, and the second outlet 8 is located above the corresponding boss 3; the inlet and outlet of the second energy dissipation cavity 9 are both located above the corresponding boss 3, and a separating tooth 10 is provided between the inlet of the second energy dissipation cavity 9 and the second outlet 8.

[0028] The high-pressure gas moving along the axial direction enters the steam seal section 4 through the first guide tooth 5, and under the guidance of the front end face of the corresponding boss 3, part of it turns radially outward and enters the first energy dissipation chamber 6, while part of it continues to move along the axial direction and enters the second energy dissipation chamber 9 after passing below the second outlet 8.

[0029] After entering the steam seal section through the first guide tooth, the main steam flow is guided by the front end face of the boss and splits into two streams. Most of the steam forms a radial main flow that enters the first energy dissipation chamber, while the other part forms an axial main flow that flows along the gap between the boss and the first diverting tooth to the low-pressure end and enters the second energy dissipation chamber.

[0030] The radial main flow splits into two streams along the steam flow channel within the first energy dissipation chamber. One stream flows from the first outlet to the back of the first guide tooth and merges with the main steam flow. The other stream flows from the second outlet to the top of the boss and merges with the axial main flow. This effectively increases the resistance and turbulence of the steam flow, significantly reduces steam leakage, and substantially improves the energy utilization efficiency of steam power equipment, thus reducing energy waste.

[0031] A composite flow-guiding steam seal, comprising a steam seal body.

[0032] In this embodiment, it also includes a rotor that passes through the steam seal body and a plurality of bosses distributed axially on the rotor.

[0033] The rotor is the core component of the steam turbine. Its outer surface has several protrusions spaced axially. The steam seal seals the high-pressure gas by engaging with the rotor and these protrusions. The rotor and its surface protrusions are not the technical points to be protected by this utility model and will not be described further here.

[0034] In this embodiment, preferably, a second guide tooth 11 and a third guide tooth 12 are respectively provided on both sides of the inlet of the first energy dissipation chamber 6; the second guide tooth 11 cooperates with the first guide tooth 5 to form a first outlet 7, and the third guide tooth 12 cooperates with the partition tooth 10 to form a second outlet 8; the second guide tooth 11 and the third guide tooth 12 cooperate to form a vortex groove 13, and the inlet of the first energy dissipation chamber 6 is located in the vortex groove 13. The high-pressure gas guided by the boss 3 first enters the vortex groove 13 and then enters the first energy dissipation chamber 6. When the main steam flow direction is guided by the front end face of the boss to turn radially outward, the radial main flow direction is guided by the second guide tooth and the third guide tooth to enter the vortex groove and flow towards the inlet of the first energy dissipation chamber located in the middle. During this process, it is constrained and disturbed by the groove wall, forming vortices of different sizes, further consuming energy, changing the flow characteristics, and increasing leakage resistance.

[0035] In this embodiment, preferably, both the second outlet 8 and the outlet of the second energy dissipation chamber 9 are tapered and gradually narrowing. By gradually reducing the channel width, the frictional energy dissipation between the steam flow and the inner wall of the channel is increased, thereby increasing the energy loss of the steam flow and achieving efficient sealing.

[0036] In this embodiment, preferably, a diversion block 14 is provided inside the first energy dissipation chamber 6 opposite to the inlet, and diversion horn openings 15 are provided on both sides of the inner end of the inlet of the first energy dissipation chamber 6. The steam flow entering the inlet of the first energy dissipation chamber is guided to the steam flow channels on both sides by the cooperation of the diversion block and the diversion horn openings.

[0037] In this embodiment, preferably, the second energy dissipation chamber 9 is provided with a fourth guide tooth 16 near the low-pressure end, and a fifth guide tooth 17 is provided between the fourth guide tooth 16 and the partition tooth 10; the fourth guide tooth 16 and the fifth guide tooth 17 cooperate to form the inlet of the second energy dissipation chamber 9, and the fifth guide tooth 17 cooperates with the partition tooth 10 to form the outlet of the second energy dissipation chamber 9. When the axial mainstream flows towards the low-pressure end along the gap between the boss and the partition tooth, it is guided into the second energy dissipation chamber by the fourth guide tooth. The steam flows along the second energy dissipation chamber to the back of the partition tooth and flows out to merge with the axial mainstream, forming obstruction and interference, further consuming energy. And under the guidance of the axial mainstream, it continues to flow towards the low-pressure end, repeatedly entering the second energy dissipation chamber, continuously enhancing the steam resistance effect and improving the sealing effect.

[0038] More preferably, the root of the fifth guide tooth 17 is formed with a stepped portion 18, and the energy dissipation channel of the second energy dissipation chamber 9 becomes larger after passing through the stepped portion 18 from the inlet. The turbulent stepped portion creates an energy dissipation channel with multiple changes in size within the second energy dissipation chamber, allowing the steam flow to pass through the channel multiple times from large to small or from small to large, thus effectively dissipating energy.

[0039] In this embodiment, a turbulence tooth 19 is provided at the root of the side wall on the high-pressure end side of the first guide tooth 5. Before the high-pressure steam flow enters the steam seal section through the gap between the first guide tooth and the rotor, the high-pressure steam flow first collides with the surface of the first guide tooth, and forms a turbulence groove with the steam seal body through the turbulence tooth, which initially turbulents the high-pressure gas and further improves the energy dissipation effect.

[0040] During operation, the high-pressure steam collides with the surface of the first guide tooth to create initial turbulence, and then enters the steam seal section through the first guide tooth. After being guided by the front end face of the boss, the main steam flow is divided into two streams. Most of it becomes a radially outward main flow, and the other part forms an axial main flow that flows along the gap between the boss and the first diverting tooth to the low-pressure end.

[0041] The radial mainstream enters the vortex groove under the guidance of the second and third guide teeth, forming a vortex and flowing towards the inlet of the first energy dissipation chamber located in the middle of the vortex groove. After entering the first energy dissipation chamber, the steam flow is divided into two streams by the guide block to the steam flow channels on both sides. One stream flows from the first outlet to the back of the first guide tooth and flows out, where it merges with the mainstream steam flow. The other stream flows from the second outlet to the top of the boss and merges with the axial mainstream steam flow.

[0042] After passing through the separator teeth, the axial mainstream enters the second energy dissipation chamber under the guidance of the fourth guide teeth, and then flows back to the back of the separator teeth, where it merges with the axial mainstream and continues to advance towards the low-pressure end.

[0043] 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 composite flow-guiding steam seal body, characterized in that, An air seal (4) is provided on the inner end face; The steam seal (4) includes a first guide tooth (5) opposite to the high-pressure gas. A first energy dissipation cavity (6) is provided on the inner end face between the first guide tooth (5) and the corresponding external rotor boss. The first energy dissipation cavity (6) is provided with a first outlet (7) and a second outlet (8) at both ends along the steam flow direction. A second energy dissipation cavity (9) is provided on the front side of the first energy dissipation cavity (6) along the steam flow direction. The inlet of the first energy dissipation chamber (6) is located between the first guide tooth (5) and the front end face of the external rotor boss, the first outlet (7) is located between the first guide tooth (5) and the inlet of the first energy dissipation chamber (6), and the second outlet (8) is located above the corresponding external rotor boss; the inlet and outlet of the second energy dissipation chamber (9) are both located above the corresponding external rotor boss, and a separating tooth (10) is provided between the inlet of the second energy dissipation chamber (9) and the second outlet (8); The high-pressure gas moving along the axial direction enters the steam seal section (4) through the first guide tooth (5), and under the guidance of the front end face of the corresponding external rotor boss, part of it turns radially outward and enters the first energy dissipation chamber (6), while part of it continues to move along the axial direction and enters the second energy dissipation chamber (9) after passing below the second outlet (8).

2. A composite flow-guiding steam seal, characterized in that, The gas seal body (1) includes the one described in claim 1.

3. The composite flow guide steam seal according to claim 2 further includes a rotor (2) passing through the steam seal body (1) and a plurality of bosses (3) distributed axially on the rotor (2).

4. A composite flow-guiding steam seal according to claim 3, characterized in that, The first energy dissipation chamber (6) is provided with a second guide tooth (11) and a third guide tooth (12) on both sides of the inlet; the second guide tooth (11) cooperates with the first guide tooth (5) to form a first outlet (7), and the third guide tooth (12) cooperates with the partition tooth (10) to form a second outlet (8); the second guide tooth (11) and the third guide tooth (12) cooperate to form a vortex groove (13), the inlet of the first energy dissipation chamber (6) is located in the vortex groove (13), and the high-pressure gas guided by the boss (3) first enters the vortex groove (13) and then enters the first energy dissipation chamber (6).

5. A composite flow-guiding steam seal according to claim 3, characterized in that, The second outlet (8) and the outlet of the second energy dissipation chamber (9) are both tapered in shape and gradually decrease in size.

6. A composite flow-guiding steam seal according to claim 3, characterized in that, A diversion block (14) is provided in the first energy dissipation chamber (6) opposite to the inlet, and a diversion horn mouth (15) is provided on both sides of the inner end of the inlet of the first energy dissipation chamber (6).

7. A composite flow-guiding steam seal according to claim 3, characterized in that, The second energy dissipation chamber (9) is provided with a fourth guide tooth (16) on the side near the low-pressure end, and a fifth guide tooth (17) is provided between the fourth guide tooth (16) and the partition tooth (10); the fourth guide tooth (16) and the fifth guide tooth (17) cooperate to form the inlet of the second energy dissipation chamber (9), and the fifth guide tooth (17) and the partition tooth (10) cooperate to form the outlet of the second energy dissipation chamber (9).

8. A composite flow-guiding steam seal according to claim 7, characterized in that, The fifth guide tooth (17) has a stepped portion (18) at its root, and the energy dissipation channel of the second energy dissipation cavity (9) becomes larger after passing through the stepped portion (18) from the inlet.

9. A composite flow-guiding steam seal according to claim 3, characterized in that, The first guide tooth (5) has a turbulence tooth (19) at the root of the side wall on the high-pressure side.

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