Thrust bearing applied to vertical water-turbine generator set
By designing the gap adjustment structure between the upper guide bearing and the thrust head in the thrust bearing, the problem of limited working performance of traditional thrust bearings under high-speed heavy load is solved, and the stability and reliability of the bearing are improved, ensuring the safe operation of the power station unit.
Patent Information
- Application Number
- CN202422149415.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-03
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-09-03
AI Technical Summary
Traditional thrust bearings have limited working performance under high-speed heavy load conditions, and the gap between the upper guide bearing shell and the race is fixed and needs to be replaced after wear.
A thrust bearing applied to vertical hydrowheel generator sets is designed, using a thrust head assembly and an upper guide bearing assembly, including an upper guide bearing shell, an upper guide frame and a clearance adjustment structure. Through the combination of wedge plate and bolts, precise adjustment of the clearance of the upper guide bearing shell is achieved.
Through the gap adjustment structure, the gap between the thrust head and the upper guide bearing shell remains unchanged during long-term operation, improving the stability and reliability of the bearings and ensuring the safe operation of the power plant unit.
Smart Images
Figure CN223035165U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to, in particular to a thrust bearing applied to a vertical water turbine generator set. Background Art
[0002] In a water turbine generator set, the thrust bearing bears the axial water thrust generated by the runner of the water turbine and transmits it to the support structure. In large industrial equipment such as rolling mills and cranes, the thrust bearing also plays a similar important role to prevent excessive displacement of the shaft in the axial direction. There are various types of thrust bearings, and the common ones are rolling thrust bearings and sliding thrust bearings. The rolling thrust bearing is usually composed of thrust rollers or thrust balls, and has the characteristics of large load-bearing capacity and small friction coefficient. However, under high-speed and heavy-load conditions, its working performance may be limited to a certain extent. The sliding thrust bearing bears the load through the oil film between the journal and the bearing bush, and can adapt to higher speeds and larger loads, but requires good lubrication and cooling conditions. The gap between the upper guide bearing bush and the seat ring on the traditional thrust bearing is fixed, and after wear in the later stage, only replacement can be carried out. Summary of the Utility Model
[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a thrust bearing applied to a vertical water turbine generator set.
[0004] The purpose of the utility model is achieved by the following technical solutions:
[0005] A thrust bearing applied to a vertical water turbine generator set, comprising:
[0006] A thrust head assembly and an upper guide bearing assembly, the upper guide bearing assembly is sleeved outside the thrust head assembly; the upper guide bearing assembly includes an upper guide bearing bush, an upper guide bearing bracket is sleeved outside the upper guide bearing bush, and several groups of gap adjusting structures are arranged between the upper guide bearing bush and the upper guide bearing bracket; the thrust head assembly is used for interference fit assembly with the rotor main shaft.
[0007] In one or more embodiments of the utility model, the thrust head assembly includes a thrust head main body, a snap ring is fixed on the upper side of the thrust head main body by a first bolt, a keyway is vertically opened on the inner diameter wall of the thrust head main body, and the keyway is assembled with a flat key fixed on the main shaft by a screw.
[0008] In one or more embodiments of the utility model, a mirror plate is also fixed on the lower side of the thrust head main body by a second bolt and a positioning pin, and an insulating plate is arranged between the mirror plate and the thrust head main body to block the shaft current.
[0009] In one or more embodiments of the present utility model, bolt holes and positioning pin holes are provided on the outer stepped surface at the lower part of the thrust head body, and the thrust head body and the mirror plate are assembled into an integral structure through bolts and positioning pins.
[0010] In one or more embodiments of the present utility model, a labyrinth ring is also sleeved and fixed on the upper part of the thrust head body to prevent oil mist in the upper guide oil basin from overflowing.
[0011] In one or more embodiments of the present utility model, the clearance adjustment structure includes a wedge plate and a wedge sub-plate bolted to the upper guide bearing bracket; the mating surfaces of the wedge plate and the wedge sub-plate are inclined surfaces, and the clearance of the upper guide bearing is adjusted by adjusting the vertical position of the wedge plate; the outer side of the wedge plate is fixed to the upper side of the upper guide bearing bracket through stud bolts and nuts.
[0012] In one or more embodiments of the present utility model, support blocks are embedded in the outer wall of the upper guide bearing bush, and the support blocks are abutted against the other side of the wedge plate.
[0013] In one or more embodiments of the present utility model, an oil guide ring is fixed to the lower side of the upper guide bearing bush and the upper guide bearing bracket through a fourth bolt, and insulating pads are arranged between the oil guide ring, the upper guide bearing bush and the upper guide bearing bracket.
[0014] In one or more embodiments of the present utility model, a platinum thermal resistor is screwed and fixed on the upper guide bearing bush.
[0015] Advantages of the present utility model:
[0016] A clearance adjustment structure with a specific shape structure proposed by the present utility model for the thrust bearing of a vertical water turbine generator set accurately positions and adjusts the upper guide bearing. Through the clearance adjustment structure, the position and clearance of the bearing can be effectively controlled, thereby ensuring the stability and reliability of the bearing during operation; the wedge plate is fixed by stud bolts and nuts, and the length of the extended end of the wedge plate in the clearance can be adjusted. By abutting the inclined surfaces at different positions on the wedge plate against the wedge sub-plate, the clearance between the upper guide bearing bush and the thrust head is adjusted, and it is ensured that the clearance between the thrust head and the upper guide bearing bush does not change during long-term operation, and at the same time, the safe operation of the power station unit is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 is a cross-sectional view of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. The components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the protection scope of the present utility model.
[0019] Embodiment 1. In this embodiment, as Figure 1 shown, a thrust bearing applied to a vertical water turbine generator set includes a thrust head assembly and an upper guide bearing assembly. The upper guide bearing assembly is sleeved outside the thrust head assembly; the upper guide bearing assembly includes an upper guide bearing bush 1, and an upper guide bearing bracket 2 is sleeved outside the upper guide bearing bush 1. A plurality of groups of gap adjustment structures are arranged between the upper guide bearing bush 1 and the upper guide bearing bracket 2; the thrust head assembly is used for interference fit assembly with the rotor main shaft.
[0020] In this embodiment, the gap adjustment structure has a specific shape and structure, and its main function is to accurately position and adjust the upper guide bearing. Through the gap adjustment structure, the position and gap of the bearing can be effectively controlled, thereby ensuring the stability and reliability of the bearing during operation.
[0021] In one or more embodiments of the present utility model, the thrust head assembly includes a thrust head body 3. A snap ring 5 is fixed to the upper side of the thrust head body 3 through a first bolt 4. A keyway is vertically formed on the inner diameter wall of the thrust head body 3, and the keyway is assembled with a flat key 6 fixed to the main shaft through a screw.
[0022] In this embodiment, the thrust head assembly is fixedly connected to the main shaft through the flat key 6 and then assisted by the snap ring 5, so that the thrust head assembly can be better fixed on the main shaft and the thrust head assembly rotates with the main shaft.
[0023] In one or more embodiments of the present utility model, a mirror plate 9 is also fixed to the lower side of the thrust head body 3 through a second bolt 7 and a positioning pin 8. An insulating plate 10 is arranged between the mirror plate 9 and the thrust head body 3 to block the shaft current.
[0024] In this embodiment, the mirror plate 9 is a rotating component fixed under the thrust head body 3. It forms a hydrodynamic oil film lubrication with the thrust bearing pads, is used to bear the axial load, and transfer the thrust load to the thrust bearing pads. It is one of the key components of the thrust bearing. By setting the insulating plate 10, it can be used to adjust the axis of the device during installation.
[0025] In one or more embodiments of the present utility model, there are bolt holes and locating pin holes on the outer stepped surface of the lower part of the thrust head body 3. The thrust head body 3 and the mirror plate 9 are assembled into an integral structure through bolts 7 and locating pins 8.
[0026] In one or more embodiments of the present utility model, a labyrinth ring 12 is also sleeved and fixed on the upper part of the thrust head body 3, which is used to prevent the oil mist in the upper guide oil basin from overflowing.
[0027] In this embodiment, through the setting of the labyrinth ring 12, it can play a role in sealing and preventing oil mist from overflowing. The labyrinth ring 12 can effectively block the oil mist formed by the lubricating oil in the upper guide oil basin from leaking out from the joint of the thrust head assembly and other components, ensuring the normal operation and working efficiency of the lubrication system.
[0028] In one or more embodiments of the present utility model, the clearance adjusting structure includes a wedge plate 13 and a wedge sub-plate 15 bolted to the upper guide bearing bracket 2; the mating surface of the wedge plate 13 and the wedge sub-plate 15 is an inclined surface, and the clearance of the upper guide bearing is adjusted by adjusting the up and down position of the wedge plate 13; the outer side of the wedge plate 13 is fixed to the upper side of the upper guide bearing bracket 2 through stud bolts 14 and nuts.
[0029] In this embodiment, the wedge plate 13 is fixed by stud bolts 14 and nuts, and the length of the extended end of the wedge plate 13 in the clearance can be adjusted. By the inclined surfaces at different positions on the wedge plate 13 abutting against the wedge sub-plate 15, the clearance between the upper guide bearing 1 and the thrust head 3 is adjusted, and it is ensured that the clearance between the thrust head 3 and the upper guide bearing 1 does not change during long-term operation, while also ensuring the safe operation of the power station unit.
[0030] In one or more embodiments of the present utility model, a support block 16 is embedded on the outer wall of the upper guide bearing 1, and the support block 16 abuts against the other side of the wedge plate 13.
[0031] In one or more embodiments of the present utility model, an oil guiding ring 17 is fixed to the lower side of the upper guide bearing 1 and the upper guide bearing bracket 2 through fourth bolts, and an insulating backing plate 18 is provided between the oil guiding ring 17, the upper guide bearing 1 and the upper guide bearing bracket 2.
[0032] In this embodiment, the main function of the oil guiding ring 17 is to guide the flow of the lubricating oil, ensure that the lubricating oil can be evenly and effectively distributed on the surface of the upper guide bearing, so as to achieve good lubrication and cooling effects.
[0033] In one or more embodiments of the present utility model, a platinum thermal resistance is rotatably connected and fixed to the upper guide bearing bush 1.
[0034] In this embodiment, the platinum thermal resistance is used to measure the temperature of the upper guide bearing bush in real time.
[0035] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, terms such as "set", "connected" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
Claims
1. A thrust bearing for a vertical hydro-turbine generator set, characterized in that: include: A thrust head assembly and an upper guide bearing assembly, wherein the upper guide bearing assembly is sleeved on the outer side of the thrust head assembly; the upper guide bearing assembly comprises an upper guide bearing shell (1), an upper guide shell frame (2) is sleeved on the outer side of the upper guide bearing shell (1), and a plurality of gap adjustment structures are arranged between the upper guide bearing shell (1) and the upper guide shell frame (2); the thrust head assembly is used for interference fit assembly with a rotor main shaft.
2. The thrust bearing for a vertical hydro-turbine generator set according to claim 1, characterized in that: The thrust head assembly comprises a thrust head body (3), a retaining ring (5) being fixed to the upper side of the thrust head body (3) via a first bolt (4), a keyway being vertically provided on the inner diameter wall of the thrust head body (3), and the keyway being assembled with a flat key (6) fixed to the main shaft via a screw.
3. The thrust bearing for a vertical hydro-turbine generator set according to claim 2 is characterized in that: A mirror plate (9) is also fixed to the lower side of the thrust head body (3) via a second bolt (7) and a positioning pin (8); an insulating plate (10) is provided between the mirror plate (9) and the thrust head body (3) for blocking shaft current.
4. The thrust bearing for a vertical hydro-turbine generator set according to claim 3 is characterized in that: The lower outer step surface of the thrust head body (3) is provided with a bolt hole and a positioning pin hole, and the thrust head body (3) and the mirror plate (9) are assembled into an integral structure by means of bolts (7) and positioning pins (8).
5. The thrust bearing for a vertical hydro-turbine generator set according to claim 2 is characterized in that: A labyrinth ring (12) is also sleeved and fixed on the upper part of the thrust head body (3) to prevent oil mist in the upper oil guide basin from overflowing.
6. The thrust bearing for a vertical hydro-turbine generator set according to claim 1, characterized in that: The clearance adjustment structure comprises a wedge plate (13) and a wedge sub-plate (15) fixed to the upper guide shoe frame (2) by bolts; the mating surfaces of the wedge plate (13) and the wedge sub-plate (15) are inclined surfaces, and the upper guide shoe clearance is adjusted by adjusting the upper and lower positions of the wedge plate (13); the outer side of the wedge plate (13) is fixed to the upper side of the upper guide shoe frame (2) by means of studs (14) and nuts.
7. The thrust bearing for a vertical hydro-turbine generator set according to claim 6, characterized in that: A support block (16) is embedded in the outer wall of the upper guide bearing (1), and the support block (16) abuts against the other side of the wedge plate (13).
8. The thrust bearing for a vertical hydro-turbine generator set according to claim 1, characterized in that: An oil guide ring (17) is fixed to the lower side of the upper guide bearing (1) and the upper guide bearing frame (2) via a fourth bolt, and an insulating pad (18) is provided between the oil guide ring (17), the upper guide bearing (1) and the upper guide bearing frame (2).
9. The thrust bearing for a vertical hydro-turbine generator set according to claim 1, characterized in that: A platinum thermal resistor is screwed and fixed on the upper guide bearing (1).