Optimization and transformation method for oil seal of bearing box of induced draft fan

Abstract

The invention discloses an optimized transformation method for an oil seal of a bearing box of an induced draft fan. Comprising the following steps: 1) preparing fault diagnosis before transformation, and designing a transformation structure scheme; (2) sealing structuralization is carried out in transformation construction, specifically, a sealing structure is transformed and optimized, and corresponding structure transformation is carried out while an oil seal is replaced; according to the demonstrated transformation structure scheme, corresponding mechanical sealing parts are measured, machined and manufactured; assembling and debugging; by optimizing and transforming an existing equipment oil seal structure and adopting the split type contact sealing structure, when the bearing box oil seal is damaged or abraded and leaks oil, the oil seal can be more conveniently disassembled, assembled and replaced, the running safety and stability of equipment can be improved, and the accident rate can be reduced.

Description

Technical Field

[0001] The invention relates to the field of electric machinery, and in particular to a method for optimizing and transforming an oil seal of a bearing box of an induced draft fan. Background Art

[0002] At present, four 200MW induced draft fans are used, model: YC35756 parameters: Q = 805000m3 / h, H = 5600Pa. The oil seal of the bearing box has poor sealing effect due to long-term wear and tear, and the bearing box has long-term oil leakage. The bearing box is not regularly replenished with lubricating oil. If the replenishment is not timely, it will cause the bearing to burn and the unit to stop operating, seriously affecting the production energy conservation and environmental protection and the safe and stable operation of the unit. Since the induced draft fan oil seal is now a felt seal and an integral oil seal, the sealing effect is not good after replacing the felt, and the integral oil seal cannot be replaced. Therefore, it is of great significance to design an oil seal that is easy to disassemble and have a good sealing effect in the actual production process. Compared with the integral felt seal that cannot be disassembled and assembled, if it is changed to a split contact seal, it will improve the safety and stability of the equipment and reduce the accident rate. Summary of the invention

[0003] The purpose of the present invention is to optimize and transform the oil seal structure of existing equipment and to propose an optimization and transformation method for the oil seal of the bearing box of an induced draft fan.

[0004] A method for optimizing and modifying an oil seal of an induced draft fan bearing box; characterized in that it comprises the following steps:

[0005] 1) Preparation before transformation

[0006] 1-1. Fault diagnosis: Detailed diagnosis of the oil leakage problem of the induced draft fan bearing box to identify the specific location and cause of the oil leakage;

[0007] 1-2. Design the structural modification plan: formulate a specific plan for oil seal modification based on the fault diagnosis results;

[0008] 2) Renovation and construction

[0009] 2-1. Shutdown and disassembly: remove the flange and bearing cover components of the induced draft fan bearing box to expose the oil seal position that needs to be modified;

[0010] 2-2. Oil seal removal: Remove the old oil seal from the bearing box;

[0011] 2-3. Sealing structure: Transform and optimize the sealing structure, and carry out corresponding structural transformation while replacing the oil seal;

[0012] According to the demonstrated transformation structure plan, measure and process the corresponding mechanical sealing components;

[0013] 2-4. Assembly and debugging.

[0014] The beneficial effects of the present invention are:

[0015] Compared with the prior art, the present invention optimizes and transforms the oil seal structure of the existing equipment. The advantage of adopting the above-mentioned split contact seal structure is that when the bearing box oil seal is damaged or worn and leaks oil, it can be more convenient to disassemble and replace the oil seal, which will improve the safety and stability of equipment operation and reduce the accident rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 To transform the flow chart;

[0017] Figure 2 This is the structural diagram of the end bearing oil seal and waist bearing oil seal close to the impeller;

[0018] Figure 3 This is the oil seal structure diagram on the motor side of the waist bearing. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] There have been accidents in which the induced draft fan bearing box oil seal leaked, resulting in the bearing lacking oil and burning the bearing, as well as other induced draft fan bearing box oil seal leaks. The purpose of this technical solution is to improve the induced draft fan bearing box oil seal, improve the safety and stability of equipment operation, and reduce the accident rate.

[0021] The oil seal design is transformed from an integral felt seal to a split multi-contact wear-resistant fixed seal ring, which achieves the oil sealing effect of the bearing box. During the transformation, the unit was shut down to measure the size of the induced draft fan bearing box oil seal on site and make the oil seal.

[0022] The following is the process flow of the transformation process:

[0023] 1) Preparation before transformation

[0024] 1-1. Fault diagnosis: First, it is necessary to diagnose the oil leakage problem of the induced draft fan bearing box in detail to determine the specific location and cause of the oil leakage. Fault diagnosis includes checking the wear of the oil seal, analyzing the rationality of the bearing box seal structure, and checking the working status of the lubrication system.

[0025] 1-2. Design a structural modification plan: According to the fault diagnosis results, formulate a specific plan for oil seal modification. The structural modification plan should take into account factors such as the material, model, installation method of the oil seal and the sealing effect after modification.

[0026] 1-3. Preparation of transformation materials: Prepare the materials and equipment such as oil seals, sealants, cleaning agents, tools, etc. required for the transformation.

[0027] 2) Renovation and construction stage

[0028] 2-1. Shutdown and disassembly: Disconnect the power supply and pipeline of the induced draft fan to ensure that the equipment is in a safe shutdown state.

[0029] Remove the flange, bearing cover and other components of the induced draft fan bearing box to expose the oil seal position that needs to be modified.

[0030] 2-2. Cleaning and inspection: Use a cleaning agent to clean the inside of the bearing box and the oil seal installation position to ensure that there is no oil stain and impurities. Check whether the bearing and bearing seat are worn or cracked, and replace or repair them if necessary.

[0031] 2-3. Oil seal removal: Remove the old oil seal from the bearing box to protect the bearing and journal from damage.

[0032] 2-4. Sealing structure: The transformation plan includes the optimization of the sealing structure, such as the use of new sealing methods such as contact labyrinth seals and oil reflux combined seals, and the corresponding structural transformation is carried out while replacing the oil seal. During the transformation process, the original performance of the bearing box should be maintained unchanged, while ensuring that the processing, manufacturing, assembly and adjustment of the newly added parts are convenient and reliable.

[0033] According to the demonstrated structural transformation plan, measure and process the corresponding mechanical parts, such as Figure 2 As shown, the bearing box end bearing oil seal and the waist bearing oil seal are processed. The two oil seals are rotating body structures, and their cross-sections are shown in the figure. Both have the same structural dimensions.

[0034] like Figure 3 As shown, the processed waist bearing is close to the oil seal on the motor side. The oil seal is a rotating body structure, and its cross-section is shown in the figure.

[0035] Install the bearing box end oil seal, waist oil seal close to the impeller, waist oil seal close to the motor side. After the transformation, a split multi-contact wear-resistant fixed seal is formed.

[0036] The sealing contact adopts a split type multi-contact wear-resistant fixed sealing ring, and can also be achieved by using a split type multi-contact wear-resistant floating sealing ring.

[0037] 2-5. Assembly and commissioning: After installing the new oil seal, assemble the bearing box, bearing cover and other components in the reverse order of disassembly.

[0038] Connect the power supply and pipeline of the induced draft fan, and check whether the connections of each component are firm and reliable.

[0039] Start the induced draft fan for trial operation and observe whether the oil seal is leaking and whether the equipment is operating normally.

[0040] 3) Maintenance after transformation

[0041] 3-1. Regular inspection: After the modification is completed, the oil seal of the induced draft fan bearing box should be inspected and maintained regularly to ensure that the oil seal is always in good working condition.

[0042] 3-2. Replacement cycle: According to the use of oil seals and the equipment operating environment, reasonably formulate the replacement cycle of oil seals to avoid oil leakage caused by aging or wear of oil seals.

[0043] 3-3. Recording and feedback: Keep detailed records of the transformation process and effects, and provide feedback to relevant departments or personnel for continuous improvement and optimization.

[0044] Finally, it should be noted that the above description is only an explanation of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail, those skilled in the art can still modify the technical solutions described above or replace some of the technical features with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for optimizing and modifying the oil seal of an induced draft fan bearing box; characterized in that: The steps include: 1) Preparation before transformation 1-1. Fault diagnosis: Detailed diagnosis of the oil leakage problem of the induced draft fan bearing box to identify the specific location and cause of the oil leakage; 1-2. Design the structural modification plan: formulate a specific plan for oil seal modification based on the fault diagnosis results; 2) Renovation and construction 2-1. Shutdown and disassembly: remove the flange and bearing cover components of the induced draft fan bearing box to expose the oil seal position that needs to be modified; 2-2. Oil seal removal: Remove the old oil seal from the bearing box; 2-3. Sealing structure: Transform and optimize the sealing structure, and carry out corresponding structural transformation while replacing the oil seal; According to the demonstrated transformation structure plan, measure and process the corresponding mechanical sealing components; 2-4. Assembly and debugging.

2. According to claim 1, a method for optimizing and modifying the oil seal of the induced draft fan bearing box is characterized in that: Fault diagnosis includes checking the wear condition of the oil seal, analyzing the rationality of the bearing box seal structure, and checking the working condition of the lubrication system.

3. According to claim 1, the method for optimizing and modifying the oil seal of the induced draft fan bearing box is characterized in that: Before removing the oil seal, clean and inspect it. Use a cleaning agent to clean the inside of the bearing box and the oil seal installation position to ensure that there is no oil stains and impurities; check whether the bearing and bearing seat are worn or cracked.

4. According to claim 1, a method for optimizing and modifying the oil seal of an induced draft fan bearing box is characterized in that: In 2-3, the bearing box end bearing oil seal and the waist bearing oil seal are processed, and the two have the same structural dimensions; the waist bearing oil seal is processed near the motor side; Install the bearing box end oil seal, the waist bearing oil seal close to the impeller, and the waist bearing oil seal close to the motor side to form a split multi-contact wear-resistant fixed seal.

5. According to claim 4, a method for optimizing and modifying the oil seal of the induced draft fan bearing box is characterized in that: The modification can also adopt split type multi-contact wear-resistant floating seal ring.

6. The method for optimizing and modifying the oil seal of the induced draft fan bearing box according to claim 1, characterized in that: In 2-5, after installing the new oil seal, assemble the bearing housing and bearing cover components in the reverse order of disassembly; Connect the power supply and pipeline of the induced draft fan, and check whether the connections of each component are firm and reliable; Start the induced draft fan for trial operation and observe whether the oil seal is leaking and whether the equipment is operating normally.

7. The method for optimizing and modifying the oil seal of the induced draft fan bearing box according to claim 1, characterized in that: Also includes 3) maintenance after transformation 3-1. Regular inspection: After the transformation is completed, the oil seal of the induced draft fan bearing box should be inspected and maintained regularly to ensure that the oil seal is always in good working condition; 3-2. Replacement cycle: According to the use of oil seals and the equipment operating environment, reasonably formulate the replacement cycle of oil seals to avoid oil leakage caused by aging or wear of oil seals; 3-3. Recording and feedback: Keep detailed records of the transformation process and results, and provide feedback to relevant departments or personnel for continuous improvement and optimization.

8. The method for optimizing and modifying the oil seal of the induced draft fan bearing box according to claim 1, characterized in that: In 1-2, the structural modification plan takes into account the material, model, installation method of the oil seal and the sealing effect after modification.

9. The method for optimizing and modifying the oil seal of the induced draft fan bearing box according to claim 1, characterized in that: In 2-3, the transformation plan also includes contact labyrinth seal and oil reflux combined seal.

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