A compression type guide disturbance energy-saving steam seal body and steam seal

Abstract

This utility model discloses a compression-type guided turbulence energy-saving steam seal body and steam seal; belonging to the field of steam turbine steam seal technology; its key technical points include a steam seal part provided on the inner end face; the steam seal part includes a first guide tooth, a first energy dissipation cavity provided on the inner end face, and a second energy dissipation cavity provided in front of the first energy dissipation cavity; the steam seal body has several flow-through elongated holes evenly distributed along the circumference, and a compression outlet is provided in the second energy dissipation cavity; the inlet of the first energy dissipation cavity is located on the back of the first guide tooth, the inlet of the second energy dissipation cavity is located above the outer rotor boss, a first diverting tooth is provided on the low-pressure end side of the inlet of the second energy dissipation cavity, and a second guide tooth is provided on the other side of the inlet of the second energy dissipation cavity; this utility model aims to provide a compression-type guided turbulence energy-saving steam seal body and steam seal that compresses steam flow and dissipates energy through counter-current; used for steam turbine steam seals.

Description

Technical Field

[0001] This utility model relates to an energy-saving steam seal, and more specifically, to a compression-type guided turbulence energy-saving steam seal body and steam seal. 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 compression-type guided turbulence energy-saving steam seal body and steam seal that compresses steam flow and counteracts energy dissipation.

[0004] The technical solution of this utility model is as follows: a compression-type guide turbulence energy-saving steam seal body, with a steam seal part 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 second energy dissipation cavity is provided on the front side of the first energy dissipation cavity along the steam flow direction. A plurality of flow passage holes are distributed circumferentially between the first energy dissipation cavity and the second energy dissipation cavity. A compression outlet corresponding to each flow passage hole is provided in the second energy dissipation cavity.

[0006] The first energy dissipation chamber inlet is located on the back of the first guide tooth, and the second energy dissipation chamber inlet is located above the outer rotor boss. A first diverter tooth is provided on the low-pressure side of the second energy dissipation chamber inlet, and a second guide tooth is provided on the other side of the second energy dissipation chamber inlet.

[0007] The high-pressure gas moving axially enters the steam seal section through the first guide tooth and is guided to turn radially outward at the front end face of the corresponding external rotor boss; part of it is guided into the second energy dissipation chamber through the cooperation of the first diverter tooth and the second guide tooth, and part of it flows to the low-pressure end through the first diverter tooth; part of the steam flow in the second energy dissipation chamber enters the first energy dissipation chamber through the flow passage, and part of it flows out from the compression outlet.

[0008] A compression-type guided turbulence energy-saving steam seal includes the aforementioned steam seal body.

[0009] In the above-mentioned compression-type guided turbulence energy-saving steam seal, the second guide tooth is inclined toward the first guide tooth and its end is located below the compression outlet.

[0010] In the above-mentioned compression-type guided turbulence energy-saving steam seal, a third guide tooth is provided on one side of the inlet of the first energy dissipation chamber, and the third guide tooth cooperates with the first guide tooth to form the outlet of the first energy dissipation chamber.

[0011] In the aforementioned compression-type guided turbulence energy-saving steam seal, the third guide tooth and the second guide tooth cooperate to form a vortex groove.

[0012] In the above-mentioned compression-type guided turbulence-saving steam seal, a second turbulence tooth is provided on the steam seal body near the low-pressure end of the first turbulence tooth, and the first turbulence tooth and the second turbulence tooth cooperate to form a turbulence cavity.

[0013] In the above-mentioned compression-type guided turbulence-saving steam seal, a turbulence tooth is provided at the root of the side wall on the high-pressure end of the first guide tooth, and the turbulence tooth cooperates with the steam seal body to form a first turbulence groove.

[0014] In the above-mentioned compression-type guide turbulence energy-saving gas seal, the end of the first guide tooth is integrally formed with a turbulence part inclined towards the high-pressure end, and the turbulence part cooperates with the turbulence tooth to form a second turbulence groove.

[0015] In the above-mentioned compression-type guided turbulence energy-saving steam seal, the tilt angle α of the turbulence part is 130-170°.

[0016] In the aforementioned compression-type guided turbulence energy-saving steam seal, the bottom corners of both the first and second energy dissipation cavities are curved structures.

[0017] In the above-mentioned compression-type guided turbulence energy-saving steam seal, the first diverting tooth and the second guiding tooth cooperate to form a gradually narrowing conical inlet.

[0018] 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 then divided into two streams. Most of the steam forms a radial main flow and enters the second energy dissipation chamber, while the other part forms an axial main flow and flows to the low-pressure end along the gap between the boss and the first diverting tooth.

[0019] The steam flow enters the steam flow channel within the second energy dissipation chamber and, upon reaching its innermost end, is blocked by the inner wall of the steam seal body. Part of the steam flows through the elongated flow hole into the first energy dissipation chamber and exits from the back of the first guide tooth, colliding and dissipating energy with the mainstream steam flow. The other part flows out from the compression outlet, increasing its velocity and impacting the mainstream steam flow below, effectively increasing the resistance and turbulence of the steam flow. Furthermore, the mainstream steam flow can carry the converging steam flow back into the energy dissipation chamber, repeating the energy dissipation process multiple times, effectively reducing steam leakage. Attached Figure Description

[0020] 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.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0023] Figure 3 This is a partial structural diagram of point A of this utility model;

[0024] Figure 4 This is a side view sectional structural diagram of the present invention.

[0025] 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. Second energy dissipation chamber; 8. Flow passage; 9. Compression outlet; 10. First flow divider tooth; 11. Second guide tooth; 12. Third guide tooth; 13. Vortex groove; 14. Second flow divider tooth; 15. Turbulence chamber; 16. Turbulence tooth; 17. First turbulence groove; 18. Turbulence section; 19. Second turbulence groove. Detailed Implementation

[0026] See Figure 1-4 As shown, the present invention discloses a compression-type guide turbulence energy-saving 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.

[0027] The steam seal section 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. A second energy dissipation cavity 7 is provided on the front side of the first energy dissipation cavity 6 along the steam flow direction. A plurality of flow passage holes 8 are distributed circumferentially between the first energy dissipation cavity 6 and the second energy dissipation cavity 7. A compression outlet 9 corresponding to the flow passage holes 8 is provided in the second energy dissipation cavity 7.

[0028] The inlet of the first energy dissipation chamber 6 is located on the back of the first guide tooth 5, and the inlet of the second energy dissipation chamber 7 is located above the outer rotor boss. A first diverter tooth 10 is provided on the low-pressure side of the inlet of the second energy dissipation chamber 7, and a second guide tooth 11 is provided on the other side of the inlet of the second energy dissipation chamber 7. The first diverter tooth and the second guide tooth cooperate to form the inlet of the second energy dissipation chamber, and the steam flow is guided into the second energy dissipation chamber through the second guide tooth.

[0029] The high-pressure gas moving axially enters the steam seal section 4 through the first guide tooth 5 and is guided to turn radially outward at the front end face of the corresponding external rotor boss; part of it is guided into the second energy dissipation chamber 7 through the cooperation of the first diverter tooth 10 and the second guide tooth 11, and part of it flows to the low-pressure end through the first diverter tooth 10; part of the steam flow in the second energy dissipation chamber 7 enters the first energy dissipation chamber 6 through the flow passage 8, and part of it flows out from the compression outlet 9.

[0030] 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 second 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.

[0031] The steam flow enters the steam flow channel within the second energy dissipation chamber and, upon reaching its innermost end, is blocked by the inner wall of the steam seal body. Part of the steam flows through the elongated flow hole into the first energy dissipation chamber and exits from the back of the first guide tooth, colliding and dissipating energy with the mainstream steam flow. The other part flows out from the compression outlet, increasing its velocity and impacting the mainstream steam flow below, effectively increasing the resistance and turbulence of the steam flow. Furthermore, the mainstream steam flow can carry the converging steam flow back into the energy dissipation chamber, repeating the energy dissipation process multiple times, effectively reducing steam leakage.

[0032] A compression-type guided turbulence energy-saving steam seal includes a steam seal body 1.

[0033] In this embodiment, a rotor 2 is also included, which is inserted into the steam seal body 1, and a plurality of protrusions 3 are distributed circumferentially on the rotor 2.

[0034] 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.

[0035] In this embodiment, the second guide tooth 11 is inclined toward the first guide tooth 5 and its end is located below the compression outlet 9. The inclination angle of the first guide tooth is set at 50-70°. When the steam flow passes through the compression outlet and is discharged, it collides with the surface of the second guide tooth and forms a certain reverse countercurrent effect with the mainstream steam under the guidance of the second guide tooth, thereby improving energy consumption efficiency.

[0036] In this embodiment, preferably, a third guide tooth 12 is provided on one side of the inlet of the first energy dissipation chamber 6, and the third guide tooth 12 cooperates with the first guide tooth 5 to form the outlet of the first energy dissipation chamber 6. The third guide tooth brings the outlet of the first energy dissipation chamber closer, and the gap between the first guide tooth and the rotor ensures that the steam flow from the outlet of the first energy dissipation chamber can create sufficient resistance to the mainstream steam flow, thereby improving the turbulence of the steam flow and the energy dissipation effect.

[0037] More preferably, the third guide tooth 12 and the second guide tooth 11 cooperate to form a vortex groove 13. When the steam flow collides with the surface of the second guide tooth, it will diffuse. Part of the steam flow will collide with the mainstream steam flow along the second guide tooth, while the other part of the steam flow will form a vortex under the guidance of the inner wall of the vortex groove to dissipate energy, thereby further improving the energy dissipation effect and reducing steam leakage.

[0038] In this embodiment, a second diverting tooth 14 is provided on the steam seal body 1 near the low-pressure end of the first diverting tooth 10. The first diverting tooth 10 and the second diverting tooth 14 cooperate to form a turbulence cavity 15. When gas flows axially towards the low-pressure end through the gap between the boss and the first diverting tooth, it enters the turbulence cavity and forms a vortex under the guidance of the inner wall of the turbulence cavity to dissipate energy.

[0039] In this embodiment, preferably, a turbulence tooth 16 is provided at the root of the side wall on the high-pressure end of the first guide tooth 5. The turbulence tooth 16 cooperates with the steam seal body 1 to form a first turbulence groove 17. 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. Through the first turbulence groove formed by the turbulence tooth and the steam seal body, the high-pressure gas is initially turbulent, further improving the energy dissipation effect.

[0040] In this embodiment, preferably, the end of the first guide tooth 5 is integrally formed with a turbulence portion 18 inclined towards the high-pressure end, and the turbulence portion 18 cooperates with the turbulence tooth 16 to form a second turbulence groove 19. When the high-pressure steam flow collides with the surface of the first guide tooth, the steam flow undergoes initial turbulence in the second turbulence groove, and under the guidance of the turbulence portion, part of the steam flow flows towards the high-pressure end and collides with the high-pressure steam flow to dissipate energy.

[0041] More preferably, the tilt angle α of the turbulence-disrupting part 18 is 130-170°. When the tilt angle α of the turbulence-disrupting part is within this range, the second turbulence-disrupting groove can effectively guide the steam flow that collides with the surface of the first guide tooth to counteract the high-pressure steam flow.

[0042] In this embodiment, preferably, the bottom corners of the first energy dissipation chamber 6 and the second energy dissipation chamber 7 are both curved surfaces. This structure allows the steam flow to proceed smoothly along the energy dissipation channel within the energy dissipation chamber, ensuring that the steam flow has sufficient velocity when it reaches the compression outlet or the outlet of the first energy dissipation chamber, thus creating significant resistance to the main steam flow.

[0043] In this embodiment, preferably, the first diverting tooth 10 and the second guiding tooth 11 cooperate to form a gradually narrowing conical inlet. The conical inlet increases the flow velocity of the steam entering the second energy dissipation chamber, enabling the steam to quickly reach the compression outlet for compression impact.

[0044] During operation, the high-pressure steam collides with the surface of the first guide tooth after passing through the turbulence groove, and cooperates with the turbulence tooth and turbulence section to perform initial turbulence. Then, it enters the steam seal section through the first guide tooth. The main steam stream collides with the front end face of the boss and is divided into two streams under the guidance of the first diverting tooth.

[0045] The first steam stream, guided by the second guide teeth and the first splitting teeth, enters the second energy dissipation chamber. It then travels along the energy dissipation channel within the chamber to its deepest point before splitting into two parts again. One part enters the first energy dissipation chamber through the flow-through orifice, travels along the energy dissipation channel within the chamber, and exits behind the first guide teeth, merging with the mainstream steam. The other part is pressurized and flows out through the compression outlet, colliding with the second guide teeth and, guided by the second guide teeth, merging with and colliding with the mainstream steam.

[0046] The second stream of steam enters the turbulence chamber through the gap between the first splitting tooth and the boss, and then continues to flow to the low-pressure end through the second splitting tooth.

[0047] 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 compression-type guided turbulence-reducing energy-saving 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. A second energy dissipation cavity (7) is provided on the front side of the first energy dissipation cavity (6) along the steam flow direction. A plurality of flow passage holes (8) are distributed circumferentially between the first energy dissipation cavity (6) and the second energy dissipation cavity (7). A compression outlet (9) corresponding to the flow passage holes (8) is provided in the second energy dissipation cavity (7). The inlet of the first energy dissipation chamber (6) is located on the back of the first guide tooth (5), and the inlet of the second energy dissipation chamber (7) is located above the outer rotor boss. A first diverter tooth (10) is provided on the low-pressure side of the inlet of the second energy dissipation chamber (7), and a second guide tooth (11) is provided on the other side of the inlet of the second energy dissipation chamber (7). The high-pressure gas moving along the axial direction enters the steam seal section (4) through the first guide tooth (5) and is guided to turn radially outward at the front end face of the corresponding external rotor boss; part of it is guided into the second energy dissipation chamber (7) through the cooperation of the first diverter tooth (10) and the second guide tooth (11), and part of it flows to the low-pressure end through the first diverter tooth (10); part of the steam flow in the second energy dissipation chamber (7) enters the first energy dissipation chamber (6) through the flow passage (8), and part of it flows out from the compression outlet (9).

2. A compression-type guided turbulence-reducing energy-saving steam seal, characterized in that, It includes the steam seal body (1) as described in claim 1.

3. The compression-type guided turbulence-reducing energy-saving steam seal according to claim 2, characterized in that, The second guide tooth (11) is inclined toward the first guide tooth (5) and its end is located below the compression outlet (9); A third guide tooth (12) is provided on one side of the inlet of the first energy dissipation chamber (6), and the third guide tooth (12) cooperates with the first guide tooth (5) to form the outlet of the first energy dissipation chamber (6).

4. The compression-type guided turbulence-reducing energy-saving steam seal according to claim 3, characterized in that, The third guide tooth (12) and the second guide tooth (11) cooperate to form a vortex groove (13).

5. A compression-type guided turbulence-reducing energy-saving steam seal according to claim 2, characterized in that, The first diverter tooth (10) is provided with a second diverter tooth (14) on the steam seal body (1) near the low-pressure end. The first diverter tooth (10) and the second diverter tooth (14) cooperate to form a turbulence cavity (15).

6. A compression-type guided turbulence-reducing energy-saving steam seal according to claim 2, characterized in that, The first guide tooth (5) has a turbulence tooth (16) at the root of the side wall on the high-pressure end. The turbulence tooth (16) cooperates with the steam seal body (1) to form a first turbulence groove (17).

7. A compression-type guided turbulence-reducing energy-saving steam seal according to claim 6, characterized in that, The first guide tooth (5) has an integrally formed turbulence portion (18) inclined towards the high-pressure end, and the turbulence portion (18) and the turbulence tooth (16) cooperate to form a second turbulence groove (19).

8. A compression-type guided turbulence-reducing energy-saving steam seal according to claim 7, characterized in that, The tilt angle α of the turbulence part (18) is 130-170°.

9. A compression-type guided turbulence-reducing energy-saving steam seal according to claim 2, characterized in that, The bottom corners of the first energy dissipation cavity (6) and the second energy dissipation cavity (7) are both curved structures.

10. A compression-type guided turbulence-reducing energy-saving steam seal according to claim 2, characterized in that, The first diverting tooth (10) and the second guiding tooth (11) cooperate to form a gradually narrowing conical inlet.

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