Labyrinth sealing structure with inclined L-shaped teeth

Abstract

The invention belongs to the technical field of turbine rotating mechanical sealing, and particularly relates to an inclined L-shaped tooth labyrinth sealing structure which comprises a static ring and a movable ring, static ring teeth are evenly distributed on the inner wall of the static ring, movable ring teeth are evenly distributed on the outer wall of the movable ring, the movable ring teeth and the static ring teeth are arranged in a staggered mode, and the static ring teeth and the movable ring teeth are arranged to be in an inclined L shape. The teeth of the movable ring incline towards the reverse flow direction of sealing fluid, incoming flow of the sealing fluid is blocked in the rotating process, turbulent kinetic energy is increased, the degree of converting fluid pressure energy into heat energy to be dissipated is increased, and the leakage amount is reduced. The static ring teeth incline towards the incoming flow direction of sealing fluid, so that a plurality of sealing cavities are formed between the static ring teeth and the movable ring teeth which are distributed in a staggered mode, the L-shaped structure can increase vortex dissipation in the sealing cavities, various gaps exist among the static ring teeth, the movable ring teeth, the static ring and the movable ring, and the sealing fluid passes through the sealing cavities and the sealing gaps to seal the sealing fluid. And pressure energy is further converted into heat energy to be dissipated, so that sealing is achieved, and leakage loss under the high-parameter working condition is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of turbine rotary mechanical seals, and in particular relates to an inclined L-shaped tooth labyrinth seal structure. Background Art

[0002] In turbine machinery such as steam turbines, gas turbines, and compressors, a certain gap is usually left between the rotating and stationary parts to avoid collisions between the stationary and rotating parts, which may cause safety problems. However, the existence of the gap causes leakage of the fluid inside the seal, which reduces the operating efficiency and economy of the entire unit. Studies have shown that the leakage loss of the steam turbine accounts for about 22% of the total loss of the entire unit. In order to reduce the leakage loss of the unit, some sealing structures are added to the rotating machinery to reduce leakage and improve the economy and mechanical performance of the machinery.

[0003] At present, the commonly used rotary seal structures include labyrinth seals, honeycomb seals, brush seals, finger seals, blade seals, etc. Among them, labyrinth seals are widely used in various rotating machinery due to their simple structure, safety and reliability, easy installation, low friction and other advantages. Its working principle is: a series of sealing teeth are arranged in the labyrinth seal structure, and there are gaps between the sealing teeth. These sealing teeth and gaps are used to increase the resistance of fluid flow, thereby reducing leakage. Specifically, when the fluid passes through the first sealing tooth of the labyrinth seal, the cross-sectional area through which the fluid passes suddenly decreases, causing the fluid speed to accelerate, and part of the static pressure energy is converted into kinetic energy. When the fluid passes through the gap between the sealing teeth, due to the sudden expansion of the area, a vortex is formed, the kinetic energy is converted into heat energy, and the pressure drops. After passing through a series of sealing teeth, the pressure gradually decreases and finally reaches atmospheric pressure, thereby achieving sealing. Common labyrinth seal structures include straight-through labyrinth seals, stepped labyrinth seals, staggered labyrinth seals, etc. These sealing structures are suitable for low-pressure or low-speed working conditions and can reduce fluid leakage. However, as rotating machinery gradually develops towards high pressure and high speed, system leakage losses are further aggravated. The currently commonly used structures are difficult to meet the demand for low leakage under high parameter conditions. Summary of the invention

[0004] In view of the problem that the existing common labyrinth seal structure is difficult to meet the low leakage under high parameter conditions, the present invention designs an inclined L-shaped tooth labyrinth seal structure, which can reduce leakage loss under high parameter conditions. The labyrinth seal structure of the present invention increases the energy dissipation during the fluid flow process by adjusting the structure of the dynamic and static ring seal teeth, and at the same time uses the gap and sealing cavity formed between the dynamic and static ring seal teeth to seal the fluid, so as to reduce the leakage of the sealing medium.

[0005] The present invention is specifically implemented through the following scheme.

[0006] The present invention provides an inclined L-shaped tooth labyrinth seal structure, comprising a stationary ring and a dynamic ring, wherein the stationary ring is fixed on a stationary component, and the dynamic ring is located inside the stationary ring and fixed on a rotating component, and a gap is provided between the stationary ring and the dynamic ring, and stationary ring teeth are evenly distributed on the inner wall of the stationary ring, and dynamic ring teeth are evenly distributed on the outer wall of the dynamic ring, and the stationary ring teeth and the dynamic ring teeth are both located in the gap, and the stationary ring teeth and the dynamic ring teeth are staggered in the axial direction; as the rotating component rotates, the dynamic ring teeth move circumferentially around the center of the rotating component between two adjacent stationary ring teeth.

[0007] The stationary ring tooth includes a first stationary ring tooth structure, one end of the first stationary ring tooth structure is fixed on the inner wall of the stationary ring, the other end is inclined toward the flow direction of the sealing fluid and is connected to one end of the second stationary ring tooth structure near the outer wall of the dynamic ring, and the other end of the second stationary ring tooth structure extends toward the countercurrent direction of the sealing fluid, forming an inclined L-shaped structure with the first stationary ring tooth structure.

[0008] The dynamic ring tooth includes a first dynamic ring tooth structure, which is located between two adjacent first static ring tooth structures. One end of the first dynamic ring tooth structure is fixed on the outer wall of the dynamic ring, and the other end is inclined in the countercurrent direction of the sealing fluid and connected to one end of the second dynamic ring tooth structure near the inner wall of the static ring. The other end of the second dynamic ring tooth structure extends in the countercurrent direction of the sealing fluid and forms an inclined L-shaped structure with the first dynamic ring tooth structure.

[0009] In a preferred embodiment of the present invention, the first stationary ring tooth structure is parallel to the first dynamic ring tooth structure, and the second stationary ring tooth structure is parallel to the second dynamic ring tooth structure.

[0010] In a preferred embodiment of the present invention, the angle between the first stationary ring tooth structure and the inner wall of the stationary ring is 120° to 140°.

[0011] In a preferred embodiment of the present invention, the angle between the second stationary ring tooth structure and the first stationary ring tooth structure is 40° to 60°.

[0012] In a preferred embodiment of the present invention, the gap between the second stationary ring tooth structure and the outer wall of the dynamic ring is 0.2 mm to 0.4 mm.

[0013] In a preferred embodiment of the present invention, the gap between the second moving ring tooth structure and the inner wall of the stationary ring is 0.2 mm to 0.4 mm.

[0014] In a preferred embodiment of the present invention, the gap between the second stationary ring tooth structure and the adjacent first dynamic ring tooth structure is 0.2 mm to 0.4 mm.

[0015] In a preferred embodiment of the present invention, a gap between the second dynamic ring tooth structure and the adjacent first stationary ring tooth structure is 0.2 mm to 0.4 mm.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention designs an inclined L-shaped tooth labyrinth seal structure, which can reduce leakage loss. The sealing structure includes a stationary ring and a dynamic ring. The inner wall of the stationary ring is evenly distributed with stationary ring teeth, and the outer wall of the dynamic ring is evenly distributed with dynamic ring teeth. Along the axial direction, a dynamic ring tooth is arranged between two adjacent stationary ring teeth, that is, the dynamic ring teeth and the stationary ring teeth are staggered. With the rotation of the rotating part, the dynamic ring teeth move circumferentially between the two adjacent stationary ring teeth. The present invention carries out structural design of the stationary ring teeth and the dynamic ring teeth, so that the sealing fluid passes through the multi-level structure under high parameter conditions, gradually converts the pressure energy into heat energy dissipation, and reduces leakage. Specifically, the following structural designs are carried out:

[0018] The stationary ring teeth and the dynamic ring teeth are respectively arranged in an inclined L-shape, wherein the dynamic ring teeth are inclined in the countercurrent direction of the sealing fluid, blocking the flow of the sealing fluid during the rotation process, increasing the turbulent kinetic energy, intensifying the degree of fluid pressure energy conversion into heat energy dissipation, and reducing the leakage. The stationary ring teeth are inclined in the direction of the sealing fluid flow, so that multiple sealing cavities are formed between the staggered stationary ring teeth and the dynamic ring teeth. The L-shaped structure can increase the vortex dissipation inside the sealing cavity. There are various gaps between the stationary ring teeth, the dynamic ring teeth, the stationary ring and the dynamic ring. The sealing fluid passes through the above-mentioned sealing cavity and sealing gap, further converting the pressure energy into heat energy dissipation, thereby achieving sealing and reducing leakage losses under high parameter conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the inclined L-shaped tooth labyrinth seal structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the structure of the rotating shaft.

[0021] Figure 3 A schematic diagram of the structure of the casing.

[0022] Figure 4 for Figure 1 Cross-sectional view along the AA direction.

[0023] Description of reference numerals:

[0024] 1. Stationary ring; 2. Stationary ring teeth; 2-1. First stationary ring teeth structure; 2-2. Second stationary ring teeth structure; 3. Moving ring; 4-Moving ring teeth; 4-1. First moving ring teeth structure; 4-2. Second moving ring teeth structure; 5. First sealing gap; 6. Second sealing gap; 7. Gap; 7-1. Sealing chamber; 8. Rotating shaft; 9. Casing. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand and implement the technical solution of the present invention, the present invention is further described below in conjunction with specific embodiments and drawings, but the embodiments are not intended to limit the present invention.

[0026] In order to solve the problem that it is difficult to meet the low leakage requirement under high parameter working conditions, the present invention designs an inclined L-shaped tooth labyrinth seal structure, comprising a stationary ring 1 and a dynamic ring 3, wherein the stationary ring 1 is fixed on the stationary component, the dynamic ring 3 is located inside the stationary ring 1 and fixed on the rotating component, a gap 7 is provided between the stationary ring 1 and the dynamic ring 3, stationary ring teeth 2 are evenly distributed on the inner wall of the stationary ring 1, dynamic ring teeth 4 are evenly distributed on the outer wall of the dynamic ring 3, the stationary ring teeth 2 and the dynamic ring teeth 4 are both located in the gap 7, and the stationary ring teeth 2 and the dynamic ring teeth 4 are staggered in the axial direction; as the rotating component rotates, the dynamic ring teeth 4 move circumferentially around the center of the rotating component between two adjacent stationary ring teeth 2. The stationary ring tooth 2 includes a first stationary ring tooth structure 2-1, one end of which is fixed on the inner wall of the stationary ring 1, and the other end is inclined in the direction of the incoming flow of the sealing fluid and is connected to one end of the second stationary ring tooth structure 2-2 near the outer wall of the moving ring 3, and the other end of the second stationary ring tooth structure 2-2 extends in the countercurrent direction of the sealing fluid, forming an inclined L-shaped structure with the first stationary ring tooth structure 2-1; the moving ring tooth 4 includes a first moving ring tooth structure 4-1, the first moving ring tooth structure 4-1 is located between two adjacent first stationary ring tooth structures 2-1, one end of the first moving ring tooth structure 4-1 is fixed on the outer wall of the moving ring 3, and the other end is inclined in the countercurrent direction of the sealing fluid and is connected to one end of the second moving ring tooth structure 4-2 near the inner wall of the stationary ring 1, and the other end of the second moving ring tooth structure 4-2 extends in the countercurrent direction of the sealing fluid, forming an inclined L-shaped structure with the first moving ring tooth structure 4-1.

[0027] The present invention sets the stationary ring teeth 2 and the dynamic ring teeth 4 to be inclined L-shaped, respectively, wherein the dynamic ring teeth 4 are inclined in the countercurrent direction of the sealing fluid, blocking the flow of the sealing fluid during the rotation process, increasing the turbulent kinetic energy, aggravating the degree of fluid pressure energy conversion into heat energy dissipation, and reducing the leakage. The stationary ring teeth 2 are inclined in the direction of the sealing fluid flow, so that a plurality of sealing cavities are formed between the staggered stationary ring teeth 2 and the dynamic ring teeth 4. The second stationary ring tooth structure 2-2 and the second dynamic ring tooth structure 4-2 can increase the vortex dissipation inside the sealing cavity. Various gaps exist between the stationary ring teeth 2, the dynamic ring teeth 4, the stationary ring 1 and the dynamic ring 3. The sealing fluid passes through the above-mentioned sealing cavity and sealing gap, further converting the pressure energy into heat energy dissipation, thereby achieving sealing and reducing leakage losses under high parameter conditions.

[0028] The above contents of the present invention will be specifically described below in conjunction with the accompanying drawings. Figure 1As shown, the present invention provides an inclined L-shaped tooth labyrinth seal structure, which can reduce leakage loss. The structure includes a stationary ring 1 and a dynamic ring 3. The dynamic ring 3 is fixed on a rotating component. In a preferred embodiment of the present invention, the rotating component can be a rotating shaft 8. The dynamic ring 3 rotates with the rotating shaft 8. The stationary ring 1 is fixed on the inner wall of the stationary component. In a preferred embodiment of the present invention, the stationary component is a housing 9, and the stationary ring 1 is stationary. Among them, the structure of the rotating shaft 8 is as shown in FIG. Figure 2 As shown, the structure of the housing 9 is as follows Figure 3 As shown. During the specific installation, the entire sealing ring composed of the stationary ring 1 and the dynamic ring 3 is specifically assembled from 6 independent sector rings. The sector angles of the 6 sector rings are all 60°, which can ensure the clamping and positioning of the sealing ring and the casing, and at the same time has the characteristics of convenient installation and disassembly and prevention of excessive deformation. The positioning angle θ is 20°.

[0029] like Figure 4 As shown, there is a gap 7 between the stationary ring 1 and the dynamic ring 3; a plurality of stationary ring teeth 2 are distributed on the inner wall of the stationary ring 1, and a plurality of dynamic ring teeth 4 are distributed on the outer wall of the dynamic ring 3. The stationary ring teeth 2 and the dynamic ring teeth 4 are both located in the sealing gap 7, and the stationary ring teeth 2 and the dynamic ring teeth 4 are arranged alternately. When the rotating shaft 8 rotates, the dynamic ring 3 rotates synchronously. Since the stationary ring 1 is stationary, the stationary ring teeth 2 and the dynamic ring teeth 4 rotate relative to each other. The stationary ring teeth 2 are stationary, and the dynamic ring teeth 4 rotate around the rotating shaft. In order to realize the above-mentioned movement, in a preferred embodiment of the present invention, the stationary ring teeth 2 and the dynamic ring teeth 4 are further arranged as follows: a plurality of groups of stationary ring sealing structures are evenly arranged along the axial direction on the inner wall of the stationary ring 1, and each group of stationary ring sealing structures includes a plurality of stationary ring teeth 2, and the plurality of stationary ring teeth 2 are circumferentially arranged along the inner wall of the stationary ring 1; along the axial direction, a dynamic ring tooth 4 is arranged between two adjacent stationary ring teeth 2, and the dynamic ring tooth 4 is arranged on the outer wall of the dynamic ring 3, and as the rotating shaft 8 rotates, the dynamic ring tooth 4 moves circumferentially around the center of the rotating shaft 8 between two adjacent stationary ring teeth 2.

[0030] The stationary ring tooth 2 includes a first stationary ring tooth structure 2-1, one end of which is fixed on the inner wall of the stationary ring 1, and the other end is inclined in the direction of the incoming flow of the sealing fluid and is connected to one end of the second stationary ring tooth structure 2-2 near the outer wall of the moving ring 3, and the other end of the second stationary ring tooth structure 2-2 extends in the countercurrent direction of the sealing fluid, forming an inclined L-shaped structure with the first stationary ring tooth structure 2-1; the moving ring tooth 4 includes a first moving ring tooth structure 4-1, the first moving ring tooth structure 4-1 is located between two adjacent first stationary ring tooth structures 2-1, one end of the first moving ring tooth structure 4-1 is fixed on the outer wall of the moving ring 3, and the other end is inclined in the countercurrent direction of the sealing fluid and is connected to one end of the second moving ring tooth structure 4-2 near the inner wall of the stationary ring 1, and the other end of the second moving ring tooth structure 4-2 extends in the countercurrent direction of the sealing fluid, forming an inclined L-shaped structure with the first moving ring tooth structure 4-1.

[0031] The inclined L-shaped structure of the dynamic ring gear 4 seals the fluid in the countercurrent direction, blocks the flow of the sealing fluid during the rotation process, increases the turbulent kinetic energy, intensifies the degree of fluid pressure energy conversion into heat energy dissipation, and reduces the leakage. The static ring gear 2 is inclined toward the incoming flow in order to be parallel to the dynamic ring gear 4 to form a multi-stage sealing cavity. The second static ring gear structure 2-2 and the second dynamic ring gear structure 4-2 can increase the vortex dissipation inside the sealing cavity. There are various gaps between the first static ring gear structure 2-1, the second static ring gear structure 2-2, the first dynamic ring gear structure 4-1, the second dynamic ring gear structure 4-2, the static ring 1 and the dynamic ring 3. The sealing fluid passes through the above-mentioned sealing cavity and the sealing gap, further converting the pressure energy into heat energy dissipation, sealing the fluid, and then reducing the leakage of the sealing fluid. Based on the above-mentioned sealing mechanism, in order to improve the sealing effect, in a preferred embodiment of the present invention, the first static ring gear structure 2-1 is parallel to the first dynamic ring gear structure 4-1, and the second static ring gear structure 2-2 is parallel to the second dynamic ring gear structure 4-2. The inclination angle between the first stationary ring tooth structure 2-1 and the inner wall of the stationary ring 1 is 120-140°. The angle between the second stationary ring tooth structure 2-2 and the first stationary ring tooth structure 2-1 is 40-60°.

[0032] Since the moving ring 3 rotates with the rotating shaft 8, if the distance between the second stationary ring tooth structure 2-2 and the outer wall of the moving ring 3 is too small, it will affect the rotation of the moving ring 3. If the distance between the two is too large, when the fluid passes through the first sealing gap 5 between the two, the effect of converting part of the pressure contained in the sealing fluid into kinetic energy will be reduced, thereby affecting the final effect of converting the pressure energy into kinetic energy, and may cause leakage of the sealing fluid. Based on this, in a preferred embodiment of the present invention, the spacing between the second stationary ring tooth structure 2-2 and the outer wall of the moving ring 3 is 0.2mm to 0.4mm.

[0033] In a preferred embodiment of the present invention, the spacing between the second moving ring tooth structure 4-2 and the inner wall of the stationary ring 1 is 0.2mm to 0.4mm. Similarly, since the moving ring 3 rotates with the rotating shaft 8, if the distance between the second moving ring tooth structure 4-2 and the inner wall of the stationary ring 1 is too small, it will affect the rotation of the moving ring 3. If the distance between the two is too large, when the fluid passes through the second sealing gap 6 between the two, the effect of converting a part of the pressure contained in the sealing fluid into kinetic energy will be reduced, thereby affecting the final effect of converting the pressure energy into kinetic energy, which may cause leakage of the sealing fluid.

[0034] For the same reason, in a preferred embodiment of the present invention, the gap between the second stationary ring tooth structure 2-2 and the adjacent first dynamic ring tooth structure 4-1 is 0.2 mm to 0.4 mm. Since the dynamic ring 3 rotates with the rotating shaft 8, if the distance between the second stationary ring tooth structure 2-2 and the adjacent first dynamic ring tooth structure 4-1 is too small, it will affect the rotation of the dynamic ring 3. If the distance between the two is too large, when the fluid passes through the gap between the two, the effect of converting a part of the pressure contained in the sealing fluid into kinetic energy will be reduced, thereby affecting the final effect of converting the pressure energy into kinetic energy, which may cause leakage of the sealing fluid.

[0035] In a preferred embodiment of the present invention, the gap between the second moving ring tooth structure 4-2 and the adjacent first stationary ring tooth structure 2-1 is 0.2mm to 0.4mm. Since the moving ring 3 rotates with the rotating shaft 8, if the distance between the second moving ring tooth structure 4-2 and the adjacent first stationary ring tooth structure 2-1 is too small, it will affect the rotation of the moving ring 3. If the distance between the two is too large, when the fluid passes through the gap between the two, the effect of converting part of the pressure contained in the sealing fluid into kinetic energy will be reduced, thereby affecting the final effect of converting the pressure energy into kinetic energy, which may cause leakage of the sealing fluid.

[0036] When the rotating shaft 8 is working normally, the sealing fluid will flow into the gap 7 between the dynamic ring 3 and the static ring 1. First, a part of the sealing fluid will pass through the first sealing gap 5 between the second static ring tooth structure 2-2 and the wall of the dynamic ring 3. In this process, a part of the pressure energy contained in the sealing fluid will be converted into kinetic energy, and then converted into heat energy and dissipated under the action of friction. After entering the sealing cavity 7-1 between the static ring teeth 2 and the dynamic ring teeth 4, the second static ring tooth structure 2-2 and the second dynamic ring tooth structure 4-2 prevent the fluid from flowing radially, and form a vortex with the L-shaped sealing tooth corner to further dissipate kinetic energy. The fluid passing through the sealing gap passes through the second sealing gap 6 between the second dynamic ring tooth structure 4-2 and the wall of the static ring 1 and flows into the next sealing cavity 7-1. In this process, the pressure energy of the fluid is dissipated again in the same way. The above process is repeated, and finally most of the pressure energy of the sealing fluid is converted into heat energy and dissipated, thereby achieving the goal of low leakage. It should be emphasized that, compared with the currently commonly used simple labyrinth seal structure, under high parameter working conditions, the present invention gradually reduces the pressure energy of the sealing fluid through the above-mentioned multi-stage energy conversion process, converts it into heat energy, and thus prevents the leakage of the sealing fluid.

[0037] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, they are also intended to be included.

Claims

1. An inclined L-shaped tooth labyrinth seal structure, comprising a stationary ring (1) and a dynamic ring (3), wherein the stationary ring (1) is fixed on a stationary component, and the dynamic ring (3) is located inside the stationary ring (1) and fixed on a rotating component, and a gap (7) is provided between the stationary ring (1) and the dynamic ring (3), characterized in that: The inner wall of the stationary ring (1) is evenly distributed with stationary ring teeth (2), and the outer wall of the moving ring (3) is evenly distributed with moving ring teeth (4); the stationary ring teeth (2) and the moving ring teeth (4) are both located in the gap (7), and the stationary ring teeth (2) and the moving ring teeth (4) are staggered along the axial direction; as the rotating component rotates, the moving ring teeth (4) move circumferentially around the center of the rotating component between two adjacent stationary ring teeth (2); The stationary ring tooth (2) comprises a first stationary ring tooth structure (2-1), one end of the first stationary ring tooth structure (2-1) is fixed on the inner wall of the stationary ring (1), the other end is inclined in the direction of the incoming flow of the sealing fluid and is connected to one end of the second stationary ring tooth structure (2-2) near the outer wall of the dynamic ring (3), the other end of the second stationary ring tooth structure (2-2) extends in the countercurrent direction of the sealing fluid, and forms an inclined L-shaped structure with the first stationary ring tooth structure (2-1); The movable ring tooth (4) comprises a first movable ring tooth structure (4-1), wherein the first movable ring tooth structure (4-1) is located between two adjacent first stationary ring tooth structures (2-1), one end of the first movable ring tooth structure (4-1) is fixed on the outer wall of the movable ring (3), and the other end is inclined in the countercurrent direction of the sealing fluid and connected to one end of the second movable ring tooth structure (4-2) near the inner wall of the stationary ring (1), and the other end of the second movable ring tooth structure (4-2) extends in the countercurrent direction of the sealing fluid and forms an inclined L-shaped structure with the first movable ring tooth structure (4-1).

2. The inclined L-shaped tooth labyrinth seal structure according to claim 1, characterized in that: The first stationary ring gear structure (2-1) and the first dynamic ring gear structure (4-1) are parallel.

3. The inclined L-shaped tooth labyrinth seal structure according to claim 2, characterized in that: The angle between the first stationary ring tooth structure (2-1) and the inner wall of the stationary ring (1) is 120° to 140°.

4. The inclined L-shaped tooth labyrinth seal structure according to claim 2, characterized in that: The angle between the second stationary ring tooth structure (2-2) and the first stationary ring tooth structure (2-1) is 40° to 60°.

5. The inclined L-shaped tooth labyrinth seal structure according to claim 1, characterized in that: The gap between the second stationary ring tooth structure (2-2) and the outer wall of the moving ring (3) is 0.2 mm to 0.4 mm.

6. The inclined L-shaped tooth labyrinth seal structure according to claim 1, characterized in that: The gap between the second moving ring tooth structure (4-2) and the inner wall of the stationary ring (1) is 0.2 mm to 0.4 mm.

7. The inclined L-shaped tooth labyrinth seal structure according to claim 1, characterized in that: The gap between the second stationary ring tooth structure (2-2) and the adjacent first dynamic ring tooth structure (4-1) is 0.2 mm to 0.4 mm.

8. The inclined L-shaped tooth labyrinth seal structure according to claim 1, characterized in that: The gap between the second dynamic ring tooth structure (4-2) and the adjacent first static ring tooth structure (2-1) is 0.2 mm to 0.4 mm.

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