Flexible self-compensating sealing structure for air pre-heater

Abstract

The utility model discloses a flexible self-compensating sealing structure for an air pre-heater, which comprises a rotor partition plate, a hard sealing pressing plate fixedly connected to one side plate surface of the rotor partition plate, a hard sealing sheet fixedly connected to the inner side of the hard sealing pressing plate, an elastic sealing pressing plate fixedly connected to the other side plate surface of the rotor partition plate, and a sealing sheet fixedly connected to the inner side of the elastic sealing pressing plate. An elastic sealing piece is fixedly connected to the inner side of the elastic sealing pressing plate, the top end of the elastic sealing piece is higher than the top end of the hard sealing piece, the elastic sealing pressing plate is of a double-bending structure, and the two bending directions are opposite. A conventional gap is kept through the hard sealing piece on one side of the rotor partition plate, the double-bending three-stress elastic sealing piece is arranged on the other side of the rotor partition plate, when the elastic sealing piece rotates to the lower portion of the sector plate along with the rotor, the elastic sealing piece receives the pressure of a lever to enter the bottom of the sector plate, and the elastic sealing piece is tightly attached to the sector plate to move. Relative sealing requirements can be met, friction force is reduced due to the lever force principle, and excessive abrasion to the sector plate is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to air preheater sealing technical field, especially relate to a flexible self compensation sealing structure for air preheater. BACKGROUND

[0002] Air preheater is a kind of preheating equipment for improving steam boiler heat exchange performance and reducing heat loss in thermal power plant, and air preheater is generally composed of rotor and shell, and the rotor divides air preheater into two parts of flue gas side and air side.Leakage of air preheater is divided into direct leakage and carrying leakage: carrying leakage is inevitable, and it is caused by carrying air by the cavity of rotor when rotating rotor passes through air side and then rotates to flue gas side: direct leakage is that flue gas side is negative pressure, and air side is positive pressure, under the action of pressure difference, air leaks to flue gas through the gap between rotor and stator directly.Therefore, reducing sealing gap causing leakage is the main way to reduce air preheater leakage.

[0003] Due to the special working condition of air preheater, the influence of thermal expansion and cold shrinkage of rotor and fan-shaped plate, in actual operation process, it is deformed like mushroom, as shown in the drawings Figure 3 The rotor deformation condition of air preheater in actual operation, the conventional sealing system utilizes a hard seal fixed on the rotor partition, and the subsidence amount of rotor under heat is calculated in advance, and a certain "safety gap" is reserved, when the rotor subsides under heat, the gap of hot end (upper part) increases, and the air with good heat exchange will leak to flue gas side through the gap, and the heat exchange efficiency is reduced. UTILITY MODEL CONTENTS

[0004] The utility model discloses a flexible self compensation sealing structure for air preheater, which is designed as flexible self compensation contact type sealing in radial sealing of hot end, i.e.the hard sealing sheet on one side of rotor partition keeps conventional gap, and the other side is provided with a double-bent three-stress elastic sealing sheet with good elasticity, when the elastic sealing sheet rotates to the lower part of fan-shaped plate along with rotor, the elastic sealing sheet receives lever pressure and enters the bottom of fan-shaped plate, and tightly adheres to the movement of fan-shaped plate, which can meet the relative sealing requirement, and due to lever force principle, friction is reduced, and fan-shaped plate is not excessively abraded.

[0005] In order to realize the purpose of the utility model, the utility model provides a kind of flexible self-compensating sealing structure for air preheater, comprising: rotor compartment board, one side board surface of the rotor compartment board is fixedly connected with hard sealing pressing plate, the inner side of the hard sealing pressing plate is fixedly connected with hard sealing sheet, the other side board surface of the rotor compartment board is fixedly connected with elastic sealing pressing plate, the inner side of the elastic sealing pressing plate is fixedly connected with elastic sealing sheet, the hard sealing sheet is set out the top end of the rotor compartment board, the top end height of the elastic sealing sheet is higher than the top end height of the hard sealing sheet and is set, the rotor compartment board is close to top end board surface and is connected with screw rod, the hard sealing pressing plate, hard sealing sheet, elastic sealing pressing plate and elastic sealing sheet are all installed on the screw rod, the elastic sealing pressing plate is set as double bending structure, and the bending direction is opposite twice.

[0006] As the preferred technical scheme of the utility model, the outer side of the hard sealing pressing plate is provided with nut and gasket, the gasket is clamped between the nut and the hard sealing pressing plate, and the nut is threadedly connected with the screw rod for limiting and fixing.

[0007] As the preferred technical scheme of the utility model, the outer side of the hard sealing pressing plate is provided with nut and gasket, the gasket is clamped between the nut and the hard sealing pressing plate, and the nut is threadedly connected with the screw rod for limiting and fixing.

[0008] As the preferred technical scheme of the utility model, the top end of the hard sealing sheet is provided with bending structure, the bending direction of the hard sealing sheet is matched with the advancing direction of the sector plate, and the top end height of the hard sealing sheet is matched with the bottom surface height of the sector plate.

[0009] As the preferred technical scheme of the utility model, the bending direction of the lower part of the elastic sealing pressing plate is opposite to the bending direction of the hard sealing sheet, and the bending direction of the upper part of the elastic sealing pressing plate is opposite to the bending direction of the hard sealing sheet.

[0010] As the preferred technical scheme of the utility model, the bending angle of the lower part of the elastic sealing pressing plate is greater than the bending angle of the upper part.

[0011] As the preferred technical scheme of the utility model, the bending angle of the lower part of the elastic sealing pressing plate is set to 120-150°.

[0012] As the preferred technical scheme of the utility model, the bending angle of the upper part of the elastic sealing pressing plate is set to 90-110°.

[0013] As the preferred technical scheme of the utility model, the top end height of the elastic sealing sheet is higher than the top end height of the hard sealing sheet by 5-8mm.

[0014] Compared with the prior art, the flexible self-compensation sealing structure for the air preheater has the following beneficial effects:

[0015] The utility model discloses a flexible self-compensation sealing structure for air preheater has the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the initial state structure schematic drawing of the utility model;

[0017] Figure 2 It is the structure schematic drawing of the utility model into the sector plate state;

[0018] Figure 3 It is the structure schematic drawing of the utility model air preheater rotor deformation.

[0019] 1 is rotor isolation warehouse board, 2 is hard sealing pressure plate, 3 is hard sealing piece, 4 is elastic sealing pressure plate, 5 is elastic sealing piece, 6 is screw rod, 7 is nut, 8 is gasket, 9 is sector plate, 10 is rotor. DETAILED DESCRIPTION

[0020] The technical scheme in the embodiments of the utility model will be apparently and completely described in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the range of protection of the utility model.

[0021] Please refer to Figures 1-3The utility model discloses an embodiment provides a kind of flexible self-compensation sealing structure for air preheater, comprising: rotor compartment board 1, one side board surface of the rotor compartment board 1 is fixedly connected with hard sealing press plate 2, the inboard of hard sealing press plate 2 is fixedly connected with hard sealing sheet 3, the other side board surface of the rotor compartment board 1 is fixedly connected with elastic sealing press plate 4, the inboard of elastic sealing press plate 4 is fixedly connected with elastic sealing sheet 5, the hard sealing sheet 3 is set out the rotor compartment board 1 top end, the top end height of the elastic sealing sheet 5 is higher than the top end height of the hard sealing sheet 3 setting, the rotor compartment board 1 is close to top end board surface and is connected with screw rod 6, and hard sealing press plate 2, hard sealing sheet 3, elastic sealing press plate 4 and elastic sealing sheet 5 are all installed on screw rod 6, and elastic sealing press plate 4 is set as double bending structure, and the bending direction of twice is opposite.

[0022] In an embodiment of the utility model, the outer side of hard sealing press plate 2 is provided with nut 7 and gasket 8, gasket 8 is clamped between nut 7 and hard sealing press plate 2, and nut 7 is threadedly connected with screw rod 6 to be limited and fixed.

[0023] In an embodiment of the utility model, the outer side of elastic sealing press plate 4 is provided with nut 7 and gasket 8, gasket 8 is clamped between nut 7 and hard elastic sealing press plate 4, and nut 7 is threadedly connected with screw rod 6 to be limited and fixed.

[0024] In an embodiment of the utility model, the top end of hard sealing sheet 3 is bent structure, the bending direction of hard sealing sheet 3 is adapted to the advancing direction of sector plate 9, and the top end height of hard sealing sheet 3 is adapted to the bottom surface height of sector plate 9.

[0025] In an embodiment of the utility model, the bending direction of the lower part of elastic sealing press plate 4 is opposite to the bending direction of hard sealing sheet 3, and the bending direction of the upper part of elastic sealing press plate 4 is opposite to the bending direction of hard sealing sheet 3.

[0026] In an embodiment of the utility model, the bending angle of the lower part of elastic sealing press plate 4 is greater than the bending angle of the upper part.

[0027] In an embodiment of the utility model, the bending angle of the lower part of elastic sealing press plate 4 is set to 120-150 °.

[0028] In an embodiment of the utility model, the bending angle of the upper part of elastic sealing press plate 4 is set to 90-110 °.

[0029] In an embodiment of the utility model, the top end height of elastic sealing sheet 5 is higher than the top end height of hard sealing sheet 3 by 5-8 mm.

[0030] The above merely is the preferred specific implementation manner of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art, according to the technical scheme and the application concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, should be covered in the protection scope of the present application.

Claims

1. A flexible self-compensating seal structure for an air preheater, characterized by, Include: The rotor partition plate (1) is fixedly connected with a hard sealing plate (2) on one side, the inner side of the hard sealing plate (2) is fixedly connected with a hard sealing piece (3), the other side of the rotor partition plate (1) is fixedly connected with an elastic sealing plate (4), the inner side of the elastic sealing plate (4) is fixedly connected with an elastic sealing piece (5), the hard sealing piece (3) is arranged on the top end of the rotor partition plate (1), the height of the top end of the elastic sealing piece (5) is higher than that of the hard sealing piece (3), the rotor partition plate (1) is connected with a screw rod (6) near the top end, the hard sealing plate (2), the hard sealing piece (3), the elastic sealing plate (4) and the elastic sealing piece (5) are installed on the screw rod (6), the elastic sealing plate (4) is arranged as a double bending structure, and the bending directions of the two times are opposite.

2. The flexible self-compensating sealing structure for the air preheater according to claim 1, wherein: The outer side of the hard sealing plate (2) is provided with a nut (7) and a gasket (8), the gasket (8) is clamped between the nut (7) and the hard sealing plate (2), and the nut (7) is threadedly connected with the screw rod (6) for limiting and fixing.

3. The flexible self-compensating sealing structure for the air preheater according to claim 1, wherein: The outer side of the elastic sealing plate (4) is provided with a nut (7) and a gasket (8), the gasket (8) is clamped between the nut (7) and the elastic sealing plate (4), and the nut (7) is threadedly connected with the screw rod (6) for limiting and fixing.

4. The flexible self-compensating sealing structure for the air preheater according to claim 1, wherein: The top end of the hard sealing piece (3) is arranged as a bending structure, the bending direction of the hard sealing piece (3) is matched with the advancing direction of the sector plate (9), and the height of the top end of the hard sealing piece (3) is matched with the height of the bottom surface of the sector plate (9).

5. The flexible self-compensating sealing structure for the air preheater according to claim 4, wherein: The bending direction of the lower part of the elastic sealing plate (4) is opposite to that of the hard sealing piece (3), and the bending direction of the upper part of the elastic sealing plate (4) is opposite to that of the hard sealing piece (3).

6. The flexible self-compensating sealing structure for the air preheater according to claim 5, wherein: The bending angle of the lower part of the elastic sealing plate (4) is greater than that of the upper part.

7. The flexible self-compensating sealing structure for the air preheater according to claim 5, wherein: The bending angle of the lower part of the elastic sealing plate (4) is arranged as 120-150°.

8. The flexible self-compensating sealing structure for the air preheater according to claim 5, wherein: The bending angle of the upper part of the elastic sealing plate (4) is arranged as 90-110°.

9. The flexible self-compensating sealing structure for the air preheater according to claim 1, wherein: The top end height of the elastic sealing sheet (5) is set to be 5-8 mm higher than the top end height of the hard sealing sheet (3).

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