Turbine bearing oil shield sealing structure
By designing the serpentine sealing channel and high-pressure negative pressure airway structure in the turbine bearing, the problems of lubricant oil leakage and coking are solved, and the effective sealing and stable operation of lubricant oil are achieved.
Patent Information
- Application Number
- CN202421263923.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-05
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-06-05
AI Technical Summary
During the operation of the turbine bearing, there are lubricating oil leakage and oil and gas leaks through the gap between the oil barrier and the shaft, which causes the sewage pipe to be baked at high temperature, which affects the oil drainage capacity of the sewage pipe, which may cause ignition and the oil barrier. The oil discharge capacity itself is insufficient, resulting in large oil leakage, forming coking and affecting the stable operation of the unit.
Design a turbine bearing oil barrier seal structure, including rotor shaft, bearing cover, bearing ring teeth and shaft ring teeth, to form a serpentine sealing channel, and a high-pressure airway and negative pressure airway are provided in the bearing cover, high-pressure airways are provided. The channel provides positive pressure, and the negative pressure airway provides suction, reducing lubricant leakage and preventing coking.
Effectively reduce lubricant leakage, avoid lubricant coking, and ensure stable operation and safety of turbine bearings.
Smart Images
Figure CN222276753U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of turbine structures, and in particular relates to a turbine bearing oil retainer sealing structure. Background Art
[0002] Turbine bearings are an important part of turbines, mainly used to support rotors, transfer loads and reduce friction losses. Usually, in order to ensure lubrication between the shaft and the bearing, a lubricating oil cavity is provided, and an oil baffle structure is provided to reduce the leakage of the lubricating oil cavity. However, during operation, there is still the problem of leakage of lubricating oil droplets and oil gas through the gap between the oil baffle and the shaft. The existing solution is to design a drain pipe at the bottom of the turbine bearing seat liner, but in actual operation, the leakage is large. When the drain oil passes through the turbine bearing seat liner space, it is baked at high temperature and coke will be generated, affecting the oil discharge capacity of the drain pipe. It is easy to cause the drain pipe position to catch fire due to poor oil discharge. At the same time, the setting of the dynamic and static clearance between the turbine bearing oil baffle oil seal teeth and the rotor is unreasonable, and the oil baffle itself has insufficient oil discharge capacity. In the case of large oil leakage, the leaking oil forms coke at the oil baffle position. After the coke rubs against the rotor, the vibration of the turbine bearing during operation increases abnormally, seriously affecting the safe and stable operation of the unit. Utility Model Content
[0003] Aiming at the technical problems of large oil leakage and coking of lubricating oil in existing turbine bearing oil baffles, the utility model provides a turbine bearing oil baffle sealing structure, which can effectively reduce the leakage of lubricating oil in turbine bearings and ensure stable operation of turbine bearings.
[0004] The utility model provides a turbine bearing oil baffle sealing structure, including a rotor shaft, a bearing cover, a bearing ring tooth and a shaft ring tooth, the bearing cover is arranged around the rotor shaft, a lubricating oil cavity is formed between the bearing cover and the rotor shaft, the bearing cover has an inner ring for closing the lubricating oil cavity, the number of the bearing ring teeth is multiple, and the multiple bearing ring teeth are spaced apart on the inner wall of the inner ring, the number of the shaft ring teeth is multiple, and the multiple shaft ring teeth are spaced apart on the outer wall of the rotor shaft, the multiple bearing ring teeth and the multiple shaft ring teeth are spaced apart and arranged one by one to form a sealing channel with a serpentine cross-section between the rotor shaft and the inner ring, a high-pressure air channel and a negative-pressure air channel are arranged in the bearing cover, the high-pressure air channel is connected to the part of the sealing channel close to the lubricating oil cavity, and the negative-pressure air channel is connected to the part of the sealing channel far from the lubricating oil cavity.
[0005] Furthermore, it also includes a vacuum suction device and a high-pressure gas tank, the high-pressure gas tank is connected to the high-pressure airway, and the vacuum suction device is connected to the negative-pressure airway.
[0006] Furthermore, the number of the high-pressure air passages is two.
[0007] The turbine bearing oil retainer sealing structure is provided with a plurality of bearing ring teeth and a plurality of shaft ring teeth between the inner ring and the rotor shaft to form a serpentine sealing channel. This sealing channel can have a certain sealing effect on the lubricating oil chamber under the premise of ensuring the mutual rotation between the bearing cover and the rotor shaft. Furthermore, a high-pressure air channel and a negative-pressure air channel are provided in the bearing cover, wherein the high-pressure air channel provides positive pressure to the portion of the sealing channel close to the lubricating oil chamber, thereby reducing the possibility of the lubricating oil entering the sealing channel, and the negative-pressure air channel provides a suction effect on the portion of the sealing channel away from the lubricating oil chamber. When the lubricating oil leaks, the lubricating oil can be promptly discharged from the negative-pressure air channel through the negative-pressure suction effect, thereby preventing the lubricating oil from leaking to the outside of the bearing cover, thereby preventing the lubricating oil from coking. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0009] Figure 1 The present invention is a structural schematic diagram of a turbine bearing oil retainer sealing structure. DETAILED DESCRIPTION
[0010] The utility model discloses a turbine bearing oil retainer sealing structure, which can effectively reduce the lubricating oil leakage of the turbine bearing and ensure the stable operation of the turbine bearing.
[0011] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution in the utility model. Obviously, what is described is only a 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 making creative work are within the scope of protection of the utility model.
[0012] See also Figure 1As shown, the utility model discloses a turbine bearing oil baffle sealing structure, including a rotor shaft 1, a bearing cover 9, a bearing ring tooth 4 and a shaft ring tooth 3, the bearing cover 9 is arranged around the rotor shaft 1, a lubricating oil chamber 6 is formed between the bearing cover 9 and the rotor shaft 1, the bearing cover 9 has an inner ring for closing the lubricating oil chamber 6, the number of the bearing ring teeth 4 is multiple, and the multiple bearing ring teeth 4 are spaced apart on the inner wall of the inner ring, the number of the shaft ring teeth 3 is multiple, and the multiple shaft ring teeth 3 are spaced apart on the outer wall of the rotor shaft 1, the multiple bearing ring teeth 4 and the multiple shaft ring teeth 3 are staggered and spaced apart to form a sealing channel 2 with a serpentine cross-section between the rotor shaft 1 and the inner ring, the bearing cover 9 is provided with a high-pressure air channel 8 and a negative-pressure air channel 7, the high-pressure air channel 8 is connected to the portion of the sealing channel 2 close to the lubricating oil chamber 6, and the negative-pressure air channel 7 is connected to the portion of the sealing channel 2 away from the lubricating oil chamber 6.
[0013] It also includes a vacuum suction device and a high-pressure gas tank, the high-pressure gas tank is connected to the high-pressure airway 8, and the vacuum suction device is connected to the negative-pressure airway 7.
[0014] The number of the high-pressure air passages 8 is two.
[0015] The turbine bearing oil retainer sealing structure is provided with a plurality of bearing ring teeth 4 and a plurality of shaft ring teeth 3 between the inner ring and the rotor shaft 1 to form a serpentine sealing channel 2. The sealing channel 2 can have a certain sealing effect on the lubricating oil chamber 6 under the premise of ensuring the mutual rotation between the bearing cover 9 and the rotor shaft 1. Furthermore, a high-pressure air channel 8 and a negative-pressure air channel 7 are provided in the bearing cover 9, wherein the high-pressure air channel 8 provides positive pressure to the portion of the sealing channel 2 close to the lubricating oil chamber 6, thereby reducing the possibility of the lubricating oil entering the sealing channel 2, and the negative-pressure air channel 7 provides a suction effect on the portion of the sealing channel 2 away from the lubricating oil chamber 6, and then when the lubricating oil leaks, the lubricating oil can be promptly discharged from the negative-pressure air channel 7 through the negative-pressure suction effect, thereby avoiding the lubricating oil from leaking to the outside of the bearing cover 9, thereby avoiding the problem of coking of the lubricating oil.
[0016] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.
Claims
1. A turbine bearing oil retainer sealing structure, characterized in that: It includes a rotor shaft, a bearing cover, a bearing ring tooth and a shaft ring tooth. The bearing cover is arranged around the rotor shaft, and a lubricating oil chamber is formed between the bearing cover and the rotor shaft. The bearing cover has an inner ring for closing the lubricating oil chamber. There are multiple bearing ring teeth, and multiple bearing ring teeth are spaced apart on the inner wall of the inner ring. There are multiple shaft ring teeth, and multiple shaft ring teeth are spaced apart on the outer wall of the rotor shaft. Multiple bearing ring teeth and multiple shaft ring teeth are spaced apart and arranged one by one to form a sealing channel with a serpentine cross-section between the rotor shaft and the inner ring. A high-pressure air channel and a negative-pressure air channel are arranged in the bearing cover. The high-pressure air channel is connected to the part of the sealing channel close to the lubricating oil chamber, and the negative-pressure air channel is connected to the part of the sealing channel far away from the lubricating oil chamber.
2. A turbine bearing oil retainer seal structure according to claim 1, characterized in that: It also includes a vacuum suction device and a high-pressure gas tank, the high-pressure gas tank is connected to the high-pressure airway, and the vacuum suction device is connected to the negative-pressure airway.
3. The turbine bearing oil retainer seal structure according to claim 1, characterized in that: The number of the high-pressure air passages is two.