Sealing device for positive pressure shaft end of central cylinder of air preheater

Abstract

The utility model relates to the technical field of air preheater center cylinder sealing, and discloses an air preheater center cylinder positive pressure shaft end sealing device which comprises a center cylinder body, a first sealing assembly is arranged on the outer surface of the positive pressure shaft end of the center cylinder body, and a second sealing assembly is fixedly installed at one end of the first sealing assembly through a screw thread. A sealing air connector is arranged at one end of the outer wall of the second sealing assembly, a pressing assembly is fixedly installed at a notch of the sealing air connector, the sealing cover and the graphite ring are arranged to form a labyrinth sealing structure, meanwhile, the graphite ring has a self-lubricating function, the problem of abrasion failure is solved, the labyrinth sealing structure is formed in the sealing device, and the sealing effect is improved. And the fan is connected to the sealing cover through the sealing air interface to form a positive pressure sealing structure, so that the purpose of positive pressure sealing of the central cylinder of the air preheater is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to air preheater center cylinder sealing technical field, concretely is a kind of air preheater center cylinder positive pressure shaft end sealing device. BACKGROUND

[0002] The center cylinder of power plant air preheater is assembled in the rotor center transmission position of air preheater, the center cylinder base is located on the connecting seat of the upper portion of support bearing in support bearing box, the guide end plate surface of the upper portion of center cylinder is connected together with end shaft, and end shaft is fixed under guide bearing box, to realize the vertical arrangement of center cylinder, however, the air preheater center cylinder shaft end sealing dust leakage, air leakage is long-term plagued production and difficult to solve problem. It not only leads to extremely poor production site environmental hygiene, even seriously affects the cleanliness of air preheater support, guide bearing oil chamber, causes bearing short-term failure, causes equipment unsafe hidden danger.

[0003] At present, traditional air preheater shaft end sealing basically adopts packing contact type sealing, due to air preheater cold and hot state temperature difference is above 350 DEG C, air preheater center cylinder rotor and shell have considerable thermal expansion difference, to cause the concentricity of packing sealing chamber and rotor to produce larger deviation when hot, lead to packing seal failure, packing seal can cause the wear of rotary shaft and the wear of packing after a period of use, when wear occurs, it cannot be compensated, causes air leakage and dust leakage phenomenon at rotary shaft, causes extremely bad influence to production environment.

[0004] Therefore, we propose a kind of air preheater center cylinder positive pressure shaft end sealing device to solve the problems proposed above. INVENTION CONTENTS

[0005] The utility model aims at providing a kind of air preheater center cylinder positive pressure shaft end sealing device, to solve the problems of traditional air preheater shaft end sealing, basically adopt packing contact type sealing, due to air preheater cold and hot state temperature difference is above 350 DEG C, air preheater center cylinder rotor and shell have considerable thermal expansion difference, to cause the concentricity of packing sealing chamber and rotor to produce larger deviation when hot, lead to packing seal failure, packing seal can cause the wear of rotary shaft and the wear of packing after a period of use, when wear occurs, it cannot be compensated, causes air leakage and dust leakage phenomenon at rotary shaft, causes extremely bad influence to production environment.

[0006] To achieve the above object, the utility model provides the following technical scheme: a kind of air preheater center cylinder positive pressure shaft end sealing device, including center cylinder body, the outer surface of the positive pressure shaft end of the center cylinder body is provided with first sealing assembly, one end of first sealing assembly is fixedly installed with second sealing assembly by screw thread, the outer wall one end of second sealing assembly is provided with sealing air interface, the slot of sealing air interface is fixedly installed with compression assembly, sealing air interface is sealingly connected with air supply component;

[0007] The first sealing assembly includes a sealing cover and a graphite ring disposed inside the sealing cover.

[0008] Preferably, the compression assembly includes a pull-down mechanism and a fixed mechanism magnetically connected to the lower end of the pull-down mechanism.

[0009] Preferably, the pull-down mechanism includes an arc-shaped connecting rod and an elastic element fixedly installed at the lower end of the arc-shaped connecting rod.

[0010] Preferably, the lower end of the elastic element is fixedly installed with a first semi-arc block, and the lower end of the first semi-arc block is fixedly installed with a magnetic plug on both sides.

[0011] Preferably, the fixed mechanism includes a corresponding rod and a second semi-arc block fixedly installed at the upper end of the corresponding rod, and the upper end of the second semi-arc block is provided with an inner magnetic groove on both sides.

[0012] Preferably, the air supply component includes a fan and a positive pressure air duct provided at one end of the fan, a non-return valve is provided at one side of the upper end of the positive pressure air duct, and a stop valve is provided at the other side of the upper end of the positive pressure air duct.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] 1. By setting the sealing cover and the graphite ring to form a labyrinth seal structure, the graphite ring has self-lubricating effect, which reduces wear and failure problems, and forms a labyrinth seal structure in the sealing device, which reduces the leakage of air preheater leakage ash-containing air outward, and the fan is connected to the sealing cover through the sealing air interface to form a positive pressure seal structure, thereby achieving the purpose of air preheater center cylinder positive pressure sealing.

[0015] 2. Since the second semi-arc block is fixedly installed at the lower end of the sealing air interface slot through the corresponding rod, when the positive pressure air duct is connected to the sealing air interface, the lower end of the positive pressure air duct is directly placed on the upper end of the second semi-arc block, the first semi-arc block is pulled to drive the magnetic plug to be inserted into the inner magnetic groove for magnetic fixation, thereby fixing the positive pressure air duct on one side of the slot of the sealing air interface through the first semi-arc block and the second semi-arc block, improving the stability of the positive pressure air duct connection. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0017] Figure 2 This is a plan view of the first sealing component of this utility model;

[0018] Figure 3 This is a plan view of the second sealing component of this utility model;

[0019] Figure 4 This is a three-dimensional structural diagram of the clamping component of this utility model.

[0020] In the diagram: 1. Central cylinder; 2. First sealing assembly; 21. Sealing cover; 22. Graphite ring; 3. Second sealing assembly; 4. Sealing air inlet; 5. Pressing assembly; 51. Pull-down mechanism; 511. Arc-shaped connecting rod; 512. Elastic element; 513. First semi-circular block; 514. Magnetic insert; 52. Fixing mechanism; 521. Corresponding rod; 522. Second semi-circular block; 523. Inner magnetic groove; 6. Air supply assembly; 61. Fan; 62. Positive pressure air duct; 63. Shut-off valve; 64. Check valve. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example 1: Please refer to Figures 1-3 A sealing device for the positive pressure shaft end of the central cylinder of an air preheater includes a central cylinder body 1. A first sealing component 2 is provided on the outer surface of the positive pressure shaft end of the central cylinder body 1. A second sealing component 3 is fixedly installed on one end of the first sealing component 2 by screw threads. A sealing air interface 4 is provided on one end of the outer wall of the second sealing component 3. A pressing component 5 is fixedly installed in the groove of the sealing air interface 4. An air supply component 6 is sealed and connected to the sealing air interface 4.

[0023] The first sealing assembly 2 includes a sealing cover 21 and a graphite ring 22 disposed inside the sealing cover 21.

[0024] The air supply assembly 6 includes a fan 61 and a positive pressure air duct 62 located at one end of the fan 61. A shut-off valve 63 is provided on one side of the upper end of the positive pressure air duct 62, and a check valve 64 is provided on the other side of the upper end of the positive pressure air duct 62.

[0025] The check valve 64 is installed to prevent backflow of ash-containing air from leaking from the air preheater. One end of the positive pressure air pipe 62 is connected and fixed to the sealed air interface 4.

[0026] In this embodiment: a labyrinth sealing structure is formed by setting a sealing cover 21 and a graphite ring 22. At the same time, the graphite ring 22 has a self-lubricating effect, which reduces wear and failure problems. The labyrinth sealing structure is formed in the sealing device to reduce the amount of ash-containing air leaking outward from the air preheater. Then, the fan 61 is connected to the sealing cover 21 through the sealing air interface 4 to form a positive pressure sealing structure, thereby achieving the purpose of positive pressure sealing of the air preheater center cylinder.

[0027] Example 2: This example is an improvement on Example 1. For details, please refer to [link / reference]. Figure 4 The clamping assembly 5 includes a pull-down mechanism 51 and a fixing mechanism 52 magnetically connected to the lower end of the pull-down mechanism 51.

[0028] The pull-down mechanism 51 includes an arc-shaped connecting rod 511 and an elastic element 512 fixedly installed at the lower end of the arc-shaped connecting rod 511.

[0029] A first semi-circular block 513 is fixedly installed at the lower end of the elastic element 512, and magnetic inserts 514 are fixedly installed on both sides of the lower end of the first semi-circular block 513.

[0030] The fixing mechanism 52 includes a corresponding rod 521 and a second semi-circular block 522 fixedly installed on the upper end of the corresponding rod 521. Inner magnetic grooves 523 are respectively opened on both sides of the upper end of the second semi-circular block 522. The magnetic insert 514 and the inner magnetic grooves 523 are magnetically connected and fixed.

[0031] In this embodiment: After the operator connects one end of the positive pressure air duct 62 to the sealed air interface 4, in order to improve the stability of the installation of the positive pressure air duct 62, since the second semi-circular block 522 is fixedly installed at the lower end of the slot of the sealed air interface 4 by the corresponding rod 521, this setting allows the lower end of the positive pressure air duct 62 to be placed directly on the upper end of the second semi-circular block 522 when connected to the sealed air interface 4. The second semi-circular block 522 supports the lower end of the positive pressure air duct 62, and at the same time, the first semi-circular block 513 is pulled to drive the magnetic plug 514 to be inserted into the inner magnetic groove 523 for magnetic fixation. Thus, the first semi-circular block 513 and the second semi-circular block 522 fix the positive pressure air duct 62 to one side of the slot of the sealed air interface 4, improving the stability of the connection of the positive pressure air duct 62.

[0032] Working principle: A labyrinth seal structure is formed by the sealing cover 21 and the graphite ring 22. The graphite ring 22 has a self-lubricating effect, reducing wear and failure. This labyrinth seal structure within the sealing device reduces the amount of ash-laden air leaking outwards from the air preheater. Connecting the fan 61 to the sealing cover 21 via the sealing air interface 4 forms a positive pressure seal, thus achieving a positive pressure seal for the air preheater's central cylinder. After the operator connects one end of the positive pressure air pipe 62 to the sealing air interface 4, to improve the stability of the positive pressure air pipe 62 installation, the second semi-circular block 52... 2. It is fixedly installed at the lower end of the groove of the sealing air interface 4 by the corresponding rod 521. This setting allows the lower end of the positive pressure air pipe 62 to be placed directly on the upper end of the second semi-circular block 522 when it is connected to the sealing air interface 4. The lower end of the positive pressure air pipe 62 is supported by the second semi-circular block 522. At the same time, the first semi-circular block 513 is pulled to drive the magnetic plug 514 to be inserted into the inner magnetic groove 523 for magnetic fixation. Thus, the positive pressure air pipe 62 is fixed to one side of the groove of the sealing air interface 4 by the first semi-circular block 513 and the second semi-circular block 522.

[0033] All standard parts used in this utility model can be purchased from the market. Irregular parts can be customized according to the description in the instruction manual and the attached drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology. In addition, the circuit connection adopts conventional connection methods in the existing technology, which will not be described in detail here.

[0034] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sealing device for the positive pressure shaft end of the central cylinder of an air preheater, comprising a central cylinder body (1), characterized in that: The outer surface of the positive pressure shaft end of the central cylinder (1) is provided with a first sealing component (2). One end of the first sealing component (2) is fixedly installed with a second sealing component (3) by screw thread. One end of the outer wall of the second sealing component (3) is provided with a sealing air interface (4). A pressing component (5) is fixedly installed in the groove of the sealing air interface (4). The sealing air interface (4) is sealed and connected with an air supply component (6). The first sealing assembly (2) includes a sealing cover (21) and a graphite ring (22) disposed inside the sealing cover (21).

2. The positive pressure shaft end sealing device for the central cylinder of an air preheater according to claim 1, characterized in that: The clamping assembly (5) includes a pull-down mechanism (51) and a fixing mechanism (52) magnetically connected to the lower end of the pull-down mechanism (51).

3. The positive pressure shaft end sealing device for the central cylinder of an air preheater according to claim 2, characterized in that: The pull-down mechanism (51) includes an arc-shaped connecting rod (511) and an elastic element (512) fixedly installed at the lower end of the arc-shaped connecting rod (511).

4. The positive pressure shaft end sealing device for the central cylinder of an air preheater according to claim 3, characterized in that: The lower end of the elastic element (512) is fixedly installed with a first semi-circular block (513), and magnetic inserts (514) are fixedly installed on both sides of the lower end of the first semi-circular block (513).

5. The positive pressure shaft end sealing device for the central cylinder of an air preheater according to claim 2, characterized in that: The fixing mechanism (52) includes a corresponding rod (521) and a second semi-circular block (522) fixedly installed on the upper end of the corresponding rod (521). Inner magnetic grooves (523) are respectively opened on both sides of the upper end of the second semi-circular block (522).

6. The positive pressure shaft end sealing device for the central cylinder of an air preheater according to claim 1, characterized in that: The air supply assembly (6) includes a fan (61) and a positive pressure air duct (62) located at one end of the fan (61). A shut-off valve (63) is provided on one side of the upper end of the positive pressure air duct (62), and a check valve (64) is provided on the other side of the upper end of the positive pressure air duct (62).

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