Constant-position labyrinth sealing device of rotary air preheater

Abstract

The utility model belongs to the technical field of air preheaters, and particularly relates to a constant-position labyrinth sealing device of a rotary air preheater, which comprises a cold-end sector plate, a rotor partition plate is mounted in the air preheater above the cold-end sector plate, a prepressing plate is arranged on the outer wall of the right side of the rotor partition plate, a back plate is arranged on the outer wall of the right side of the prepressing plate, and a sealing ring is arranged on the back plate. A constant-position labyrinth type sealing assembly is arranged between the outer wall of the bottom end of the pre-pressing plate and the top of the cold end sector plate. A constant-position labyrinth type sealing assembly is arranged between the outer wall of the bottom end of the pre-pressing plate and the top of the cold end sector plate, the constant-position labyrinth type sealing assembly is composed of a plurality of thin sealing pieces, the thin sealing pieces are elastic, the tops of the thin sealing pieces are stacked and fixed together, and the bottoms of the thin sealing pieces are arranged in a staggered mode. Labyrinth sealing can be achieved between the pre-pressing plate and the cold end sector plate, the sealing effect can be further improved, and the air leakage phenomenon is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of air preheaters, in particular to a constant-position labyrinth sealing device for a rotary air preheater. Background Art

[0002] When the rotary air preheater is running in hot state, the rotor will produce mushroom-shaped thermal deformation. For the cold end radial direction of the air preheater, the traditional technology is to install a hard sealing plate on the rotor partition. When the partition produces thermal deformation, the sealing plate will also deform together. The gap value between the deformed rotor partition and the cold end fan plate will change. Generally, as the load of the unit increases, the deformation of the air preheater will also increase, so its gap will become smaller and smaller, and the air leakage rate will show an overall downward trend. However, due to the variable load of the unit, the deformation of the air preheater is also variable. At low load, the air leakage gap here is large, and the air leakage here cannot be controlled, which will cause the air preheater leakage rate to increase. Therefore, a constant position labyrinth sealing device for a rotary air preheater is invented. Utility Model Content

[0003] In view of the above problems and / or the problems existing in the existing rotary air preheater constant position labyrinth seal device, the present utility model is proposed.

[0004] Therefore, the purpose of the present invention is to provide a constant-position labyrinth seal device for a rotary air preheater, which can solve the above-mentioned existing problems.

[0005] In order to solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0006] A rotary air preheater constant position labyrinth seal device, comprising a cold end sector plate, a rotor partition plate is installed in the air preheater above the cold end sector plate, a pre-compression plate is provided on the right outer wall of the rotor partition plate, a back plate is provided on the right outer wall of the pre-compression plate, and a constant position labyrinth seal assembly is provided between the outer wall of the bottom end of the pre-compression plate and the top of the cold end sector plate;

[0007] The constant position labyrinth seal assembly is composed of a plurality of thin sealing sheets, and the thin sealing sheets are provided with elasticity. The tops of the plurality of thin sealing sheets are stacked and fixed together, and the bottoms of the plurality of thin sealing sheets are staggered and arranged. The bottom outer wall of the thin sealing sheet is elastically and sealingly connected to the through hole at the top of the cold end fan plate.

[0008] As a preferred solution of the constant-position labyrinth sealing device of the rotary air preheater described in the utility model, the outermost thin sealing sheet is fixedly mounted on the outer wall of the bottom end of the pre-pressing plate by means of tightening bolts, the shape of the thin sealing sheet is set to C shape, and the shape of the back plate is set to L shape.

[0009] As a preferred solution of the rotary air preheater constant position labyrinth sealing device described in the utility model, the left outer wall of the rotor partition is provided with a cold end old hard sealing plate, and the left outer wall of the cold end old hard sealing plate is provided with a first baffle.

[0010] As a preferred solution of the rotary air preheater constant position labyrinth sealing device described in the utility model, a second baffle is provided on the right outer wall of the back plate, and a sealing gasket is provided on the right outer wall of the second baffle.

[0011] As a preferred solution of the rotary air preheater constant position labyrinth sealing device described in the utility model, wherein: the first baffle, the cold end old hard sealing plate, the rotor partition, the pre-pressure plate, the back plate, the second baffle and the sealing gasket are fixedly connected together by the cooperation of the second bolt and the nut.

[0012] As a preferred solution of the rotary air preheater constant position labyrinth sealing device described in the utility model, the top outer walls of several thin sealing sheets are elastically connected to the bottom outer wall of the back plate, and a negative gap is reserved between the bottom outer wall of the thin sealing sheet and the cold end fan plate.

[0013] As a preferred solution of the rotary air preheater constant position labyrinth sealing device described in the utility model, a mounting groove is provided at the bottom of the thin sealing sheet, and a sealing strip is provided in the mounting groove.

[0014] Compared with existing technologies:

[0015] By arranging a constant position labyrinth sealing assembly between the outer wall of the bottom end of the pre-compression plate and the top of the cold end sector plate, a labyrinth seal can be achieved between the pre-compression plate and the cold end sector plate, thereby further improving the sealing effect and avoiding air leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the front view of the structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the partial structure of the utility model;

[0018] Figure 3 For this utility model Figure 2 A schematic diagram of the structure enlargement in the middle;

[0019] Figure 4 This is a schematic diagram of the back panel structure of the utility model.

[0020] In the figure: rotor partition 1, first baffle 2, cold end old hard sealing sheet 3, pre-pressure plate 4, back plate 5, second baffle 6, bolts 7, nuts 8, thin sealing sheet 9, mounting groove 91, sealing strip 92, clamping bolt 10, cold end sector plate 11. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] The utility model provides a rotary air preheater constant position labyrinth seal device, please refer to Figure 1-Figure 4 , including a cold end sector plate 11, a rotor partition plate 1 is installed in the air preheater above the cold end sector plate 11, a pre-load plate 4 is provided on the right outer wall of the rotor partition plate 1, a back plate 5 is provided on the right outer wall of the pre-load plate 4, a constant position labyrinth sealing assembly is provided between the outer wall of the bottom end of the pre-load plate 4 and the top of the cold end sector plate 11, a cold end old hard sealing piece 3 is provided on the left outer wall of the rotor partition plate 1, a first baffle plate 2 is provided on the left outer wall of the cold end old hard sealing piece 3, a second baffle plate 6 is provided on the right outer wall of the back plate 5, and a sealing gasket is provided on the right outer wall of the second baffle plate 6, the first baffle plate 2, the cold end old hard sealing piece 3, the rotor partition plate 1, the pre-load plate 4, the back plate 5, the second baffle plate 6 and the sealing gasket are fixedly connected together by the cooperation of the second bolt 7 and the nut 8.

[0023] The constant position labyrinth seal assembly is composed of a plurality of thin sealing sheets 9, and the thin sealing sheets 9 are provided with elasticity. The tops of the plurality of thin sealing sheets 9 are superimposed and fixed together, and the bottoms of the plurality of thin sealing sheets 9 are staggered. The bottom outer wall of the thin sealing sheet 9 is elastically connected to the through hole at the top of the cold end sector plate 11. The outermost thin sealing sheet 9 is fixedly installed on the outer wall of the bottom end of the preload plate 4 by a clamping bolt 10. The shape of the thin sealing sheet 9 is set to be C-shaped, and the shape of the back plate 5 is set to be L-shaped. The top outer walls of the plurality of thin sealing sheets 9 are elastically connected to the bottom outer wall of the back plate 5. A negative gap is reserved between the bottom outer wall of the thin sealing sheet 9 and the cold end sector plate 11. An installation groove 91 is provided at the bottom of the thin sealing sheet 9, and a sealing strip 92 is provided in the installation groove 91. The first baffle plate 2 and the cold end old hard sealing sheet 3 are used in combination to seal the left outer wall of the rotor partition plate 1, and the second baffle plate 6 is used to press the outer walls of the preload plate 4 and the back plate 5 to play a sealing role, thereby improving the stability of the structure of the installed thin sealing sheet 9.

[0024] The principle is: by setting a pre-stressing plate 4 for installing the thin sealing sheet 9, the thin sealing sheet 9 can be installed above the cold end fan-shaped plate 11, so that the bottom of the thin sealing sheet 9 can be softly sealed with the through hole on the surface of the cold end fan-shaped plate 11, so that when the cold end fan-shaped plate 11 is deformed, the thin sealing sheet 9 on the top of the cold end fan-shaped plate 11 can be deformed synchronously with the deformation of the cold end fan-shaped plate 11, thereby sealing the top through hole of the cold end fan-shaped plate 11, so that the pre-stressing plate 4 and the thin sealing sheet 9 are used together to achieve a sealing effect, and a back plate 5 is set to apply pressure to the top of the thin sealing sheet 9, so that the thin sealing sheet 9 can seal the top of the cold end fan-shaped plate 11, and a plurality of thin sealing sheets 9 can achieve multiple sealing. In addition, by matching the installation groove 91 and the sealing strip 92, multiple sealing can be achieved again to achieve a constant-position labyrinth seal.

[0025] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A rotary air preheater constant position labyrinth seal device, comprising a cold end sector plate (11), a rotor partition plate (1) is installed in the air preheater above the cold end sector plate (11), a pre-compression plate (4) is provided on the right outer wall of the rotor partition plate (1), and a back plate (5) is provided on the right outer wall of the pre-compression plate (4), characterized in that: A constant position labyrinth seal assembly is provided between the outer wall of the bottom end of the pre-compression plate (4) and the top of the cold end sector plate (11); The constant position labyrinth seal assembly is composed of a plurality of thin sealing sheets (9), and the thin sealing sheets (9) are provided with elasticity. The tops of the plurality of thin sealing sheets (9) are stacked and fixed together, and the bottoms of the plurality of thin sealing sheets (9) are staggered and arranged. The bottom outer wall of the thin sealing sheet (9) is elastically and sealingly connected to the through hole at the top of the cold end sector plate (11).

2. The constant position labyrinth seal device for rotary air preheater according to claim 1, characterized in that: The outermost thin sealing sheet (9) is fixedly mounted on the outer wall of the bottom end of the pre-pressing plate (4) by means of a clamping bolt (10); the shape of the thin sealing sheet (9) is set to be C-shaped, and the shape of the back plate (5) is set to be L-shaped.

3. The constant position labyrinth seal device for rotary air preheater according to claim 1, characterized in that: The left outer wall of the rotor partition plate (1) is provided with a cold end old hard sealing plate (3), and the left outer wall of the cold end old hard sealing plate (3) is provided with a first baffle (2).

4. The constant position labyrinth seal device for a rotary air preheater according to claim 3, characterized in that: A second baffle plate (6) is provided on the right outer wall of the back plate (5), and a sealing gasket is provided on the right outer wall of the second baffle plate (6).

5. The constant position labyrinth seal device for rotary air preheater according to claim 4, characterized in that: The first baffle (2), the cold end old hard sealing plate (3), the rotor partition (1), the pre-compression plate (4), the back plate (5), the second baffle (6) and the sealing gasket are fixedly connected together by the cooperation of a second bolt (7) and a nut (8).

6. The constant position labyrinth seal device for rotary air preheater according to claim 1, characterized in that: The top outer walls of the plurality of thin sealing sheets (9) are elastically connected to the bottom outer wall of the back plate (5), and a negative gap is reserved between the bottom outer wall of the thin sealing sheets (9) and the cold end sector plate (11).

7. The constant position labyrinth seal device for a rotary air preheater according to claim 1, characterized in that: The bottom of the thin sealing sheet (9) is provided with a mounting groove (91), and a sealing strip (92) is provided in the mounting groove (91).

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