Split detachable brush seal

Abstract

The utility model relates to turbine sealing technical field, and disclose a kind of detachable split brush seal, including sealing body;Several circumferential arrangement split seal members are detachably connected on the sealing body, split seal member is embedded with brush seal strip, and brush seal strip is used to buffer the radial displacement of rotor.The utility model provides a kind of detachable split brush seal, and split seal member and brush seal strip are set, since the outer periphery of sealing body is distributed with multiple split seal members, and in the use process, brush seal strip is inclined along the rotation direction of rotor, the radial displacement of rotor can be buffered, and the vibration and disturbance of rotor, airflow can make brush seal strip restore state, so that rotor can restore closed state, and rotor is not damaged, and original static gap is maintained.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine sealing technology, and in particular to a split, detachable brush seal. Background Technology

[0002] Brush seals are devices installed between the rotor and stator of a gas turbine to reduce or prevent gas from leaking directly to the next stage without doing work. During operation, the rotor rotates at high speed while the stator is fixed. Therefore, a certain gap must be maintained between the rotor and the stator to prevent them from rubbing against each other. The traditional comb-tooth seal is used between the rotor and stator of the gas turbine. The gap between the two is the most critical part, which directly affects the safety and economy of the entire gas turbine unit. When the gap between the traditional comb-tooth seal and the rotor is too large, gas can easily leak directly to the next stage. Conversely, when the gap between the traditional comb-tooth seal and the rotor is too small, the rotor will be irreversibly damaged due to factors such as shaft vibration and rotor eccentricity during rotor rotation, which will cause the leakage to increase continuously, affecting the safety and service life of the unit.

[0003] To address the aforementioned issues, this application proposes a detachable brush seal. Utility Model Content

[0004] Based on the technical problems existing in the background art, this utility model proposes a split and detachable brush seal.

[0005] This utility model proposes a detachable brush seal, which includes a sealing body; The sealing body is detachably connected to several circumferentially arranged split sealing components, each of which is fitted with a brush-type sealing strip, which is used to buffer the radial displacement of the rotor.

[0006] Preferably, the split sealing element includes a first sealing body and a second sealing body, the first sealing body and the second sealing body abutting each other, the first sealing body and the second sealing body being detachably connected to the outer periphery of the sealing body by a locking member, a groove being formed between the first sealing body and the second sealing body, and the brush-type sealing strip being fitted into the groove.

[0007] Preferably, the brush-type sealing strip includes a brush block, which is fitted into a groove and has brush bristles connected to it.

[0008] Preferably, the locking element includes a pin and a slotted flat-end screw. The first sealing body and the second sealing body are connected to the pin. The first sealing body and the second sealing body are inserted into the outer periphery of the sealing body through the pin. The internal thread of the pin is connected to an internal hexagon screw that is threaded to the outer periphery of the sealing body.

[0009] Preferably, a slotted flat-end screw is inserted between the first sealing body and the second sealing body, and the slotted flat-end screw is used to prevent the first sealing body and the second sealing body from loosening radially.

[0010] The above-mentioned technical solution of this utility model has the following beneficial technical effects: By using separate sealing components and brush-type sealing strips, multiple separate sealing components are distributed on the outer periphery of the sealing body. During use, the brush-type sealing strips tilt along the rotation direction of the rotor, which can buffer the radial displacement of the rotor. The vibration and disturbance of the rotor and airflow can restore the state of the brush-type sealing strips, allowing the rotor to return to the closed state without damaging the rotor and maintaining the original static gap. By employing a flexible seal, it adapts to the deformation and instantaneous offset of the rotor, and flexibly and quickly retracts. It is a non-contact seal, which can reduce the installation gap of the seal and thus reduce the leakage. Because the outer periphery of the sealing body has multiple detachable split sealing components, it is easy to disassemble and assemble it, and it can be matched with sealing devices for large-diameter rotors. Because the split seal is detachable, maintenance only requires replacing the brush seal strip, which reduces costs and improves efficiency. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of a detachable brush seal proposed in this utility model.

[0012] Figure 2 This utility model Figure 1 A schematic diagram of the structure of the split-type seal.

[0013] Figure 3 This utility model Figure 2 Side view of the middle.

[0014] Figure 4 This utility model Figure 2 A schematic diagram of a local structure.

[0015] Figure 5 This utility model Figure 2 A schematic diagram of the structure of a brush-type sealing strip.

[0016] Reference numerals: 1. Sealing body; 2. Split seal; 21. First sealing body; 22. Second sealing body; 3. Brush seal strip; 31. Brush block; 32. Brush bristles; 4. Socket head screw; 5. Pin; 6. Slotted flat end screw; 7. Groove. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0018] like Figure 1-5 As shown, the present invention proposes a detachable brush seal, which includes a sealing body 1. In this embodiment, a plurality of circumferentially arranged split seals 2 are detachably connected to the sealing body 1. A brush-type sealing strip 3 is embedded in the split seal 2, and the brush-type sealing strip 3 is used to buffer the radial displacement of the rotor.

[0019] In this embodiment, the split sealing element 2 includes a first sealing body 21 and a second sealing body 22. The first sealing body 21 and the second sealing body 22 abut against each other. The first sealing body 21 and the second sealing body 22 are detachably connected to the outer periphery of the sealing body 1 by a locking member. The locking member includes a pin 5 and a slotted flat-end screw 6. The pin 5 passes through the first sealing body 21 and the second sealing body 22. The first sealing body 21 and the second sealing body 22 are inserted into the outer periphery of the sealing body 1 by the pin 5. The internal thread of the pin 5 passes through an internal hexagon screw 4 that is threaded to the outer periphery of the sealing body 1. A groove 7 is formed between the first sealing body 21 and the second sealing body 22. The brush-type sealing strip 3 is fitted into the groove 7. The brush-type sealing strip 3 includes a brush block 31. The brush block 31 is fitted into the groove 7, and brush bristles 32 are connected to the brush block 31.

[0020] It should be noted that: because multiple separate sealing parts 2 are distributed on the outer periphery of the sealing body 1, and during use, the brush bristles 32 on the brush block 31 are tilted along the rotation direction of the rotor, which can buffer the radial displacement of the rotor. The vibration and disturbance of the rotor and airflow can restore the state of the brush bristles 32, so that the rotor can return to the closed state without damaging the rotor and maintaining the original static gap. By employing a flexible seal, it adapts to the deformation and instantaneous offset of the rotor, and flexibly and quickly retracts. It is a non-contact seal, which can reduce the installation gap of the seal and thus reduce the leakage. Since the first sealing body 21 and the second sealing body 22 are installed on the outer periphery of the sealing body 1 by internal hexagon screws 4 and pins 5, it is easy to disassemble and assemble them, and to match the sealing device of the large-diameter rotor. Since the split seal 2 is detachable, maintenance only requires replacing the brush seal 3, which reduces costs and improves efficiency.

[0021] In a specific embodiment, a slotted flat-end screw 6 is inserted between the first sealing body 21 and the second sealing body 22, and the slotted flat-end screw 6 is used to prevent the first sealing body 21 and the second sealing body 22 from loosening radially.

[0022] In a specific embodiment, it should be further explained that: the diameter of the brush bristles 32 is 0.07-0.15mm, the circumferential arrangement density is 90-250 bristles / mm, the axial length of the brush bristles 32 is 2.5-12mm, and the brush bristles 32 are arranged in layers at a certain angle of 30°-60° with the radial direction of the rotor. Each brush bristle 32 is a beam with one end as a fulcrum. The brush bristles 32 are elastic and can be instantly deflected along the rotation direction of the rotor. The radial flow caused by the radial pressure gradient changes the angle to compensate for the gap. The dynamic process of the brush bristles 32 is called the pressure closure effect. This effect enables the sealing body 1 to have good sealing characteristics.

[0023] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A detachable brush seal, comprising a sealing body (1), characterized in that: The sealing body (1) is detachably connected to a number of circumferentially arranged split sealing parts (2), and the split sealing parts (2) are fitted with brush-type sealing strips (3), which are used to buffer the radial displacement of the rotor.

2. The detachable brush seal according to claim 1, characterized in that, The split sealing element (2) includes a first sealing body (21) and a second sealing body (22). The first sealing body (21) and the second sealing body (22) abut against each other. The first sealing body (21) and the second sealing body (22) are detachably connected to the outer periphery of the sealing body (1) by a locking member. A groove (7) is formed between the first sealing body (21) and the second sealing body (22). The brush-type sealing strip (3) is fitted into the groove (7).

3. A detachable brush seal according to claim 2, characterized in that, The brush-type sealing strip (3) includes a brush block (31), which is fitted into a groove (7), and brush bristles (32) are connected to the brush block (31).

4. A detachable brush seal according to claim 2, characterized in that, The locking component includes a pin (5) and a slotted flat-end screw (6). The first sealing body (21) and the second sealing body (22) are connected to the pin (5). The first sealing body (21) and the second sealing body (22) are inserted into the outer periphery of the sealing body (1) through the pin (5). The internal thread of the pin (5) is connected to the internal hexagon screw (4) which is threaded to the outer periphery of the sealing body (1).

5. A detachable brush seal according to claim 2, characterized in that, A slotted flat-end screw (6) is inserted between the first sealing body (21) and the second sealing body (22), and the slotted flat-end screw (6) is used to prevent the first sealing body (21) and the second sealing body (22) from loosening radially.

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