Lubrication seal structure for turbine bearing pedestal
By designing a drive ring and a sealing toothed ring on the turbine bearing housing, and using rollers to transmit vibration to stabilize the distance between the sealing toothed ring and the main shaft surface, the problem of lubricating oil leakage under vibration conditions in traditional sealing structures is solved, and effective sealing of lubricating oil is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-02
- Publication Date
- 2026-08-04
AI Technical Summary
Traditional turbine bearing housing lubrication and sealing structures are ineffective under high-speed operation and vibration conditions, leading to lubricating oil leakage.
A lubrication and sealing structure for a steam turbine bearing housing was designed. By setting a sealing toothed ring and a driving mechanism on the drive ring, the distance between the end of the sealing toothed ring and the surface of the steam turbine main shaft can always be kept within a good sealing range. The vibration is transmitted by rollers to stabilize the sealing effect.
When the shaft vibrates, maintain a stable distance between the sealing toothed ring and the spindle surface to ensure effective sealing of the lubricating oil and prevent leakage.
Smart Images
Figure CN224592189U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of turbine bearing housing sealing technology, and more specifically relates to a turbine bearing housing lubrication and sealing structure. Background Technology
[0002] During the operation of a steam turbine, the lubrication and sealing structure of the bearing housing plays a crucial role. Traditional steam turbine bearing housing lubrication and sealing structures typically employ a labyrinth seal structure, which prevents lubricating oil in the bearing housing from leaking outwards along the axis by maintaining a near-contact distance between the sealing teeth and the shaft.
[0003] However, there are some drawbacks: high-speed operation and shaft vibration will cause changes in the distance between the turbine main shaft surface and the sealing teeth, which will have a certain impact on the sealing effect. Utility Model Content
[0004] To address the shortcomings of existing technologies, this utility model provides a lubrication and sealing structure for a turbine bearing housing, which ensures that the distance between the end of the sealing toothed ring on the drive ring and the surface of the turbine main shaft is always kept within a good sealing range, thus guaranteeing the sealing effect on the lubricating oil.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a turbine bearing housing lubrication and sealing structure, wherein the bearing housing is provided with a shaft hole, the turbine main shaft passes through the shaft hole, a drive ring is provided inside the bearing housing, a plurality of sealing ring teeth are provided on the inner ring surface of the drive ring, the sealing ring teeth extend into the shaft hole, and the inner ring side of the sealing ring teeth is close to the turbine main shaft, the drive ring slides in a radial plane inside the bearing housing, and a drive mechanism is provided between the drive ring and the turbine main shaft.
[0006] Furthermore, the drive mechanism includes several drive brackets connected to the drive ring, and rotatable rollers are provided on the drive brackets. The rollers are in contact with the turbine main shaft, and the rotation of the turbine main shaft drives the rollers to rotate. The rollers are located on the outside of the bearing housing.
[0007] Furthermore, the bearing housing is provided with a first movable cavity, the drive ring moves radially within the first movable cavity, and the two sides of the drive ring are slidably connected to the inner walls of the two sides of the first movable cavity, respectively.
[0008] Furthermore, a first spring is provided between the first movable cavity and the drive bracket, and the first spring is located on the side of the drive bracket away from the turbine main shaft.
[0009] Furthermore, the drive ring is provided with a second movable cavity corresponding to the sealing ring teeth, the outer ring side of the sealing tooth ring slides along the radial plane within the second movable cavity, and a second spring is provided between the sealing tooth ring and the second movable cavity.
[0010] Compared with the prior art, the beneficial effects of this utility model are: when the shaft vibrates, the vibration is transmitted to the drive ring through the drive bracket via the rollers that are in contact with the surface of the turbine main shaft. This causes the drive ring to translate in the radial plane within the first movable cavity of the bearing seat as the shaft vibrates, thereby ensuring that the distance between the end of the sealing tooth ring on the drive ring and the surface of the turbine main shaft is always kept within a good sealing range, thus guaranteeing the sealing effect on the lubricating oil. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the lubrication and sealing structure of the turbine bearing housing of this utility model; Figure 2 This is a front view of the turbine bearing housing lubrication and sealing structure of this utility model; Figure 3 This is a front view of the sealing toothed ring in the turbine bearing housing lubrication and sealing structure of this utility model; Figure 4 for Figure 1 Enlarged view of section A.
[0012] Reference numerals: 1. Bearing housing; 2. Shaft hole; 3. Steam turbine main shaft; 4. Drive ring; 5. Sealing ring teeth; 6. Drive bracket; 7. Roller; 8. First movable cavity; 9. First spring; 10. Second movable cavity; 11. Second spring; 12. Support plate. Detailed Implementation
[0013] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.
[0014] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "a number" means two or more, unless otherwise explicitly specified.
[0015] Reference Figures 1 to 4 The present invention will be further described below.
[0016] A turbine bearing housing lubrication and sealing structure is disclosed. The bearing housing 1 has a shaft hole 2 through which the turbine main shaft 3 passes. A drive ring 4 is provided inside the bearing housing 1. A plurality of sealing ring teeth 5 are provided on the inner ring surface of the drive ring 4. The sealing ring teeth 5 extend into the shaft hole 2, and the inner ring side of the sealing ring teeth 5 is close to the turbine main shaft 3. The drive ring 4 slides in a radial plane inside the bearing housing 1. A drive mechanism is provided between the drive ring 4 and the turbine main shaft 3.
[0017] like Figure 1 As shown, in this preferred embodiment, the driving mechanism includes a plurality of driving brackets 6 connected to the driving ring 4. The driving brackets 6 are provided with rotatable rollers 7. The rollers 7 are in contact with the turbine main shaft 3. The rotation of the turbine main shaft 3 drives the rollers 7 to rotate. The rollers 7 are located on the outside of the bearing seat 1.
[0018] like Figure 1 As shown in this example, preferably, the bearing housing 1 is provided with a first movable cavity 8, the drive ring 4 is radially movable in the first movable cavity 8, and the two sides of the drive ring 4 are slidably connected to the inner walls of the two sides of the first movable cavity 8 respectively.
[0019] like Figure 1 As shown in the preferred embodiment, a first spring 9 is provided between the first movable cavity 8 and the drive bracket 6. The first spring 9 is located on the side of the drive bracket 6 away from the turbine main shaft 3, and the first spring 9 is in a compressed state to provide elastic force to the drive bracket 6, making the movement of the drive bracket 6 and the drive ring 4 more stable.
[0020] like Figure 1 and Figure 2 As shown, when the shaft vibrates, the vibration is transmitted to the drive ring 4 through the drive bracket 6 via the roller 7 that contacts the surface of the turbine main shaft 3. This causes the drive ring 4 to translate in the radial plane within the first movable cavity 8 of the bearing housing 1 as the shaft vibrates. This ensures that the distance between the end of the sealing ring tooth 5 on the drive ring 4 and the surface of the turbine main shaft 3 is always kept within a good sealing range, thus guaranteeing the sealing effect on the lubricating oil.
[0021] like Figure 1 As shown in this example, preferably, the drive ring 4 is provided with a second movable cavity 10 corresponding to the sealing ring tooth 5. The outer ring side of the sealing ring tooth 5 slides along the radial plane in the second movable cavity 10. A second spring 11 is provided between the sealing ring tooth 5 and the second movable cavity 10, and the second spring 11 is in a compressed state, pushing out the inner ring side of the sealing ring tooth 5. The movable sealing ring tooth 5 can avoid its side from rigidly contacting the turbine main shaft 3 and damaging the surface of the turbine main shaft 3.
[0022] Specifically, a support plate 12 is provided on the outer ring side of the sealing ring tooth 5 for connecting the second spring 11, and the support plate 12 is slidably connected in the second movable cavity 10.
[0023] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.
Claims
1. A lubrication and sealing structure for a steam turbine bearing housing, characterized in that: The bearing housing has a shaft hole through which the turbine main shaft passes. A drive ring is provided inside the bearing housing. Several sealing ring teeth are provided on the inner ring surface of the drive ring. The sealing ring teeth extend into the shaft hole, and the inner ring side of the sealing ring teeth is close to the turbine main shaft. The drive ring slides in a radial plane inside the bearing housing. A drive mechanism is provided between the drive ring and the turbine main shaft.
2. The turbine bearing housing lubrication and sealing structure according to claim 1, characterized in that: The drive mechanism includes several drive brackets connected to the drive ring. Rotatable rollers are provided on the drive brackets. The rollers are in contact with the turbine main shaft. The rotation of the turbine main shaft drives the rollers to rotate. The rollers are located on the outside of the bearing housing.
3. The turbine bearing housing lubrication and sealing structure according to claim 1, characterized in that: The bearing housing is provided with a first movable cavity, the drive ring moves radially within the first movable cavity, and the two sides of the drive ring are slidably connected to the inner walls of the two sides of the first movable cavity, respectively.
4. The turbine bearing housing lubrication and sealing structure according to claim 3, characterized in that: A first spring is provided between the first movable cavity and the drive bracket, and the first spring is located on the side of the drive bracket away from the turbine main shaft.
5. The turbine bearing housing lubrication and sealing structure according to claim 1, characterized in that: The drive ring is provided with a second movable cavity corresponding to the sealing ring teeth. The outer ring side of the sealing tooth ring slides along the radial plane within the second movable cavity. A second spring is provided between the sealing tooth ring and the second movable cavity.