Blade sealing device for induced draft fan of power station boiler

Abstract

The utility model relates to the technical field of power plant boiler maintenance, in particular to a power plant boiler induced draft fan blade sealing device which comprises a rotor body, a connecting shaft is arranged on the top face of the rotor body, an attaching pad is arranged on the outer surface of the rotor body, and a mounting pad is arranged on the outer surface of the attaching pad. And the first sealing ring is installed on the lower surface of the attaching pad, and a first adaptive groove and a second adaptive groove are sequentially formed in the outer surface of the first sealing ring from top to bottom. By improving the operation adjusting stability of the rotor of the suction fan, serious consequences such as non-stop of a unit caused by the fact that the fan cannot be adjusted mechanically are avoided, extremely high safety benefits are achieved, a new thought is provided for the sealing scheme of the blade of the rotor of the fan, and the service life of the blade of the rotor of the fan is prolonged through the modes of combined sealing, lubrication increasing and the like. And the operation stability of the fan rotor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power plant boiler maintenance, in particular to a power plant boiler induced draft fan blade sealing device. Background Art

[0002] The working environment of the suction fan rotor blades is relatively harsh, and there are more sulfur dioxide, sulfur trioxide and dust in the flue gas.

[0003] Due to the harsh working environment of the suction fan, there are more sulfur dioxide, sulfur trioxide and dust in the flue gas. When the temperature is low, sulfur trioxide and water vapor produce sulfuric acid vapor, which corrodes the metal. The original blade seal is a Fey sealing ring with poor corrosion resistance. After the Fey sealing ring is corroded, the sealing effect becomes worse, and dust particles enter between the blade shaft and the bushing, increasing the rotation resistance of the rotor blades. The rotor becomes stuck, resulting in the suction fan being unable to adjust the suction volume normally, affecting the boiler pressure adjustment. Therefore, it has become an urgent problem to be solved for us to improve and improve the above-mentioned problems. Utility Model Content

[0004] The utility model aims to provide a blade sealing device for a power plant boiler induced draft fan to solve the problem that the blade sealing has poor corrosion resistance as mentioned in the above background technology, the sealing effect becomes poor after the Fey sealing ring is corroded, dust particles enter between the blade stalk shaft and the shaft liner, increase the rotation resistance of the rotor blades, the rotor becomes stuck, and the suction fan cannot adjust the suction volume normally, thus affecting the boiler pressure adjustment.

[0005] To achieve the above object, the utility model provides the following technical solution: a blade sealing device for a boiler induced draft fan of a power plant, comprising a rotor body, a connecting shaft is arranged on the top surface of the rotor body, a fitting pad is arranged on the outer surface of the rotor body, and a mounting pad is arranged on the outer surface of the fitting pad;

[0006] The first sealing ring is installed on the lower surface of the fitting pad, and the outer surface of the first sealing ring is provided with a first adapting groove and a second adapting groove in sequence from top to bottom.

[0007] Preferably, a second sealing ring is provided on the outer surface of the first sealing ring, and the second sealing ring has the same size as the mounting pad.

[0008] Preferably, the inner side wall of the second sealing ring is fixedly connected with a first fastening ring and a second fastening ring in sequence from top to bottom, and a contact pad is provided on the top surface of the second fastening ring.

[0009] Preferably, the first fastening ring and the first adapting groove are adapted to each other, and the second fastening ring and the second adapting groove are adapted to each other.

[0010] Preferably, the lower surface of the mounting pad contacts the upper surface of the second sealing ring, and the second sealing ring wraps the first sealing ring.

[0011] Preferably, a sealing ring is provided on the outer surface of the mounting pad and the second sealing ring, a first fastening column is provided on the right side surface of the sealing ring, and a second fastening column is provided on the left side surface of the sealing ring.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The blade sealing device of the boiler induced draft fan of the power plant is provided with a rotor body, a connecting shaft, a fitting pad, a mounting pad, a first sealing ring, a first adapting groove, a second adapting groove, a second sealing ring, a first fastening ring, a second fastening ring and a contact pad. When in use, the fitting pad and the mounting pad are first installed on the outer surface of the rotor body. Through this design, the overall sealing effect is good, and smoke and dust can be effectively blocked from entering the interior of the rotor body. It has special effects such as oil resistance, acid resistance and high temperature resistance. Then, the second sealing ring is installed on the outer surface of the mounting pad, and the first adapting groove and the second adapting groove are respectively adapted to the first fastening ring and the second fastening ring, so that the connection between the mounting pad and the second sealing ring is relatively stable, so that the two non-metallic sealing rings can effectively resist the erosion of smoke and dust, prevent the metal sealing ring from being corroded by smoke and aging, and prevent the blade from being stuck due to dust accumulation, and the overall sealing effect is good. By enhancing the sealing effect of the suction fan rotor body, reducing the dust on the blade root joint area, and improving the blade rotation flexibility, the problem of rotor blade jamming is solved and the fan operation reliability is improved. After the implementation of a blade sealing modification technology for preventing suction fan rotor jamming, good economic and social benefits have been achieved. The modified suction fan did not have the defect of slow dynamic adjustment and did not affect the unit load. Compared with the period before the project was implemented, a large amount of power generation loss can be saved every year. Since the suction fan is the main auxiliary equipment of the boiler and there is no spare equipment, the operation and adjustment stability of the suction fan rotor is improved, and serious consequences such as unit non-stopping caused by the inability to adjust the fan dynamic adjustment are avoided. It has extremely high safety benefits. The utility model provides a new idea for the sealing solution of the fan rotor blades. The operation stability of the fan rotor is improved through combined sealing and increased lubrication. It has high practical value and promotion value.

[0014] 2. The sealing device for the blade of the boiler induced draft fan of the power plant is equipped with a sealing ring, a first fastening column and a second fastening column. When in use, first, after the installation of the gasket and the second sealing ring is completed as a whole, the sealing ring is installed at the connection between the installation gasket and the second sealing ring, so that the connection can be sealed again, and the overall sealing effect is good. Finally, the installation gasket and the second sealing ring are fastened and pressed by the first fastening column and the second fastening column, and the overall limiting effect is good, which reflects the functionality of the design. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the disassembly of the rotor body and the second sealing ring structure of the utility model;

[0017] Figure 3 It is a schematic diagram of the disassembly of the bonding pad and the second sealing ring structure of the utility model;

[0018] Figure 4 It is a schematic diagram of the disassembly of the rotor body and the sealing ring structure of the utility model;

[0019] Figure 5 It is a schematic diagram of the disassembly of the mounting pad and the rotor body structure of the utility model.

[0020] In the figure: 1. rotor body; 2. connecting shaft; 3. fitting pad; 4. mounting pad; 5. first sealing ring; 6. first adapting groove; 7. second adapting groove; 8. second sealing ring; 9. first fastening ring; 10. second fastening ring; 11. resistance pad; 12. sealing ring; 13. first fastening column; 14. second fastening column. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-5 , an embodiment provided by the utility model:

[0023] A power plant boiler induced draft fan blade sealing device, the rotor body 1, the first sealing ring 5 and the second sealing ring 8 used in the present application are all products that can be directly purchased on the market, and their principles and connection methods are all existing technologies well known to those skilled in the art, so they will not be repeated here, including a rotor body 1, a connecting shaft 2 is arranged on the top surface of the rotor body 1, a fitting pad 3 is arranged on the outer surface of the rotor body 1, a mounting pad 4 is arranged on the outer surface of the fitting pad 3, the lower surface of the mounting pad 4 is in conflict with the upper surface of the second sealing ring 8, the second sealing ring 8 wraps the first sealing ring 5, and a sealing ring 12 is arranged on the outer surface of the mounting pad 4 and the second sealing ring 8, and a first fastening column 13 is arranged on the right side surface of the sealing ring 12, and a second fastening column 14 is arranged on the left side surface of the sealing ring 12. After the mounting pad 4 and the second sealing ring 8 are installed as a whole, the sealing ring 12 is installed at the connection between the mounting pad 4 and the second sealing ring 8, so that the connection can be sealed again, and the overall sealing effect is good, and finally the mounting pad 4 and the second sealing ring 8 are fastened and pressed by the first fastening column 13 and the second fastening column 14, and the overall limiting effect is good;

[0024] The first sealing ring 5 is installed on the lower surface of the fitting pad 3. The outer surface of the first sealing ring 5 is provided with a first adapting groove 6 and a second adapting groove 7 from top to bottom. The outer surface of the first sealing ring 5 is provided with a second sealing ring 8. The second sealing ring 8 has the same size as the mounting pad 4. The inner side wall of the second sealing ring 8 is fixedly connected with a first fastening ring 9 and a second fastening ring 10 from top to bottom. The top surface of the second fastening ring 10 is provided with a contact pad 11. The first fastening ring 9 and the first adapting groove 6 are adapted to each other, and the second fastening ring 10 and the second adapting groove 7 are adapted to each other. First, the fitting pad 3 and the mounting pad 4 are installed on the outer surface of the rotor body 1. Through this design, the overall sealing effect is good, and smoke and dust can be effectively blocked from entering the interior of the rotor body 1. It has special effects such as oil resistance, acid resistance and high temperature resistance, and then a second sealing ring 8 is installed on the outer surface of the mounting pad 4, and the first adapting groove 6 and the second adapting groove 7 are respectively adapted to the first fastening ring 9 and the second fastening ring 10, so that the connection between the mounting pad 4 and the second sealing ring 8 is relatively stable, so that the two non-metallic sealing rings can effectively resist the erosion of flue gas and dust, and prevent the metal sealing ring from aging after being corroded by flue gas and ash accumulation causing blade jamming. The overall sealing effect is good, and the sealing effect of the suction fan rotor body 1 is enhanced, the dust accumulation at the root joint of the blade is reduced, and the rotation flexibility of the blade is improved, thereby solving the problem of rotor blade jamming and improving the operation reliability of the fan. After the implementation of a blade sealing modification technology for preventing the suction fan rotor from jamming, good economic and social benefits have been achieved. The modified suction fan did not have the defect of slow dynamic adjustment and did not affect the unit load. Compared with the period before the project was implemented, a large amount of power generation loss can be saved every year. Since the suction fan is the main auxiliary equipment of the boiler and there is no spare equipment, the operation and adjustment stability of the suction fan rotor is improved, and serious consequences such as unit non-stop caused by the inability to adjust the fan dynamic adjustment are avoided. It has extremely high safety benefits. The utility model provides a new idea for the sealing solution of the fan rotor blades. The operation stability of the fan rotor is improved through combined sealing and increased lubrication. It has high practical value and promotion value.

[0025] Working principle: When the staff uses this device, first connect the device to an external power supply to provide power support for the device, first install the fitting pad 3 and the mounting pad 4 on the outer surface of the rotor body 1, through this design, the overall sealing effect is good, can effectively prevent smoke and dust from entering the interior of the rotor body 1, and has special effects such as oil resistance, acid resistance and high temperature resistance, and then install the second sealing ring 8 on the outer surface of the mounting pad 4, and the first adapter groove 6 and the second adapter groove 7 are respectively adapted to the first fastening ring 9 and the second fastening ring 10, so that the connection between the mounting pad 4 and the second sealing ring 8 is relatively stable. After the mounting pad 4 and the second sealing ring 8 are installed as a whole, by installing the sealing ring 12 at the connection between the mounting pad 4 and the second sealing ring 8, the connection can be sealed again, and the overall sealing effect is good. Finally, the mounting pad 4 and the second sealing ring 8 are tightened and pressed by the first fastening column 13 and the second fastening column 14, and the overall limiting effect is good. The above is all the working principles of the utility model.

[0026] The above description is only a preferred embodiment of the utility model and does not limit the utility model in any form. Any ordinary technician in the industry can smoothly implement the utility model as shown in the drawings of the specification and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the utility model using the technical content disclosed above are all equivalent embodiments of the utility model. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the utility model are still within the protection scope of the technical solution of the utility model.

Claims

1. A blade sealing device for a boiler induced draft fan of a power plant, comprising a rotor body (1), a connecting shaft (2) being arranged on the top surface of the rotor body (1), characterized in that: The outer surface of the rotor body (1) is provided with a fitting pad (3), and the outer surface of the fitting pad (3) is provided with a mounting pad (4); A first sealing ring (5), the first sealing ring (5) is installed on the lower surface of the fitting pad (3), and the outer surface of the first sealing ring (5) is provided with a first adapting groove (6) and a second adapting groove (7) in sequence from top to bottom.

2. A sealing device for blades of a power plant boiler induced draft fan according to claim 1, characterized in that: A second sealing ring (8) is provided on the outer surface of the first sealing ring (5), and the second sealing ring (8) has the same size as the mounting pad (4).

3. A sealing device for blades of a power plant boiler induced draft fan according to claim 2, characterized in that: The inner side wall of the second sealing ring (8) is fixedly connected with a first fastening ring (9) and a second fastening ring (10) in sequence from top to bottom, and a contact pad (11) is arranged on the top surface of the second fastening ring (10).

4. A sealing device for blades of a power plant boiler induced draft fan according to claim 3, characterized in that: The first fastening ring (9) and the first adapting groove (6) are adapted to each other, and the second fastening ring (10) and the second adapting groove (7) are adapted to each other.

5. The sealing device for blades of a power plant boiler induced draft fan according to claim 1, characterized in that: The lower surface of the mounting pad (4) contacts the upper surface of the second sealing ring (8), and the second sealing ring (8) wraps the first sealing ring (5).

6. The sealing device for blades of a power plant boiler induced draft fan according to claim 1, characterized in that: The outer surfaces of the mounting pad (4) and the second sealing ring (8) are provided with A sealing ring (12), wherein a first fastening column (13) is provided on the right side surface of the sealing ring (12), A second fastening column (14) is provided on the left side surface of the sealing ring (12).

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