Shafting grounding device of turboset
By setting up multiple grounding brushes and grounding paths on the spindle of the turbine unit, the problem of easy wear of the brush head and lack of backup brushes in the grounding system is solved, achieving a more stable grounding effect and a longer service life.
Patent Information
- Application Number
- CN202422126653.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-30
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-30
AI Technical Summary
In existing turbine grounding devices, the brush head is prone to wear, and there are usually no backup brushes in the grounding system, resulting in grounding failure and may damage the metal surface and bearings.
A steam turbine shaft system grounding device is designed, using multiple grounding brushes and is arranged on the spindle through multiple grounding paths to ensure that the current can be released quickly and avoid potential accumulation.
It effectively improves the service life of the brush, ensures the overall grounding effect of the spindle, prevents arc damage to the metal surface and bearings, and extends the operating life of the turbine unit.
Smart Images
Figure CN223039142U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of steam turbine grounding, and is a shafting grounding device for a steam turbine unit. Background Art
[0002] Due to their own mechanical or electrical characteristics, most rotating machinery will generate induced electromotive force on the shaft during rotation. If the induced voltage is not processed or the grounding brush is not reasonably installed, then this voltage will automatically find other paths to the ground. These electric arcs will damage the metal surface layer and increase the normal operating clearance between components. If this electrostatic discharge is not corrected in time, the bearings and seals will be gradually damaged, and the dynamic characteristics of the rotor will slowly change, and eventually the rotor may be damaged, resulting in expensive repair work.
[0003] At present, the steam turbine unit discharges electricity by installing a grounding brush at one end of the steam turbine shaft, and releases the generated electromotive force through the installed grounding brush. As the operating years of the steam turbine unit increase, problems such as wear, thinning, and decreased surface finish of the steam turbine shaft surface will directly cause the wear rate of the grounding brush to rise. It is very easy for the brush head of the grounding brush to be severely worn, and the grounding brush loses its original function and no longer releases the electromotive force generated on the shaft. And there is no spare brush in the grounding system. If the brush head of the grounding brush cannot be replaced in time, it is very easy for the electric arc generated on the steam turbine shaft to damage the metal surface layer, bearings and seals. Summary of the Invention
[0004] The utility model provides a shafting grounding device for a steam turbine unit, which overcomes the above-mentioned deficiencies of the prior art and can effectively solve the problems that the brush head of the existing steam turbine grounding device is easily worn and there is no spare brush in the grounding system.
[0005] The technical solution of the utility model is realized by the following measures: A shafting grounding device for a steam turbine unit includes a steam turbine, a first bearing box, a second bearing box, a first brush and a second brush. There is a main shaft inside the steam turbine. There is a first bearing box on the left side of the steam turbine. The left part of the main shaft is located inside the first bearing box. A first sleeve is fixedly installed on the upper left side of the first bearing box. The first sleeve is a cylindrical shape with an open rear end and a closed front end. A fixed pin in the left-right direction is fixedly installed inside the first sleeve. One end of the first brush is hinged to the fixed pin, and the other end of the first brush is attached to the outer side of the upper part of the main shaft. There is a second bearing box on the right side of the steam turbine. The right part of the main shaft is located inside the second bearing box. A plurality of second sleeves are installed at intervals on the upper right side of the second bearing box. Each second sleeve is a cylindrical shape with an open end close to the main shaft and a closed end far from the main shaft. A second brush is slidably installed inside each second sleeve, and one end of the second brush contacts the outer side of the main shaft.
[0006] The following is a further optimization and / or improvement of the above-mentioned technical solution of the utility model:
[0007] A first connection hole communicating inside and outside may be formed at the front end of the first sleeve. A first terminal is fixedly installed in the first connection hole. The first brush includes a brush rod, a first brush head, and a first terminal. The front part of the brush rod is hinged to a fixing pin. A wire is fixedly connected between the front end of the brush rod and the first terminal. The rear end of the brush rod extends out of the rear end of the first sleeve and is fixedly installed with a first brush head. The lower part of the first brush head is attached to the outer side of the upper part of the main shaft.
[0008] One end of the second sleeve away from the main shaft may be provided with a second connection hole penetrating inside and outside. A second terminal is fixedly installed in the second connection hole. The second brush includes a second brush head, a brush braid, a second terminal, and a spring. The second brush head is slidably installed inside the second sleeve. A brush braid is fixedly connected between the second brush head and the second terminal. A spring is sleeved outside the brush braid. One end of the spring is fixedly connected to the second brush head, and the other end of the spring is fixedly connected to the second terminal.
[0009] A first fixing seat may be sleeved outside the first sleeve. The right end of the first fixing seat is fixedly connected to the upper left side of the first bearing box. A plurality of first screw holes penetrating inside and outside are spaced apart on the outer side of the first sleeve. Second screw holes penetrating inside and outside are formed on the outer side of the first fixing seat corresponding to each first screw hole. A first bolt is screwed in each first screw hole. One end of each first bolt close to the first sleeve passes through the second screw hole and is screwed in the corresponding first screw hole.
[0010] A second fixing seat may be sleeved outside each second sleeve. The left end of each second fixing seat is fixedly connected to the right side of the second bearing box. A plurality of third screw holes penetrating inside and outside are spaced apart along the circumference on the outer side of the second sleeve. Fourth screw holes penetrating inside and outside are formed on the outer side of the second fixing seat corresponding to each third screw hole. A second bolt is screwed in each fourth screw hole. One end of each second bolt close to the second sleeve passes through the fourth screw hole and is screwed in the corresponding third screw hole.
[0011] The structure of the utility model is reasonable and compact, and it is convenient to use. When in use, the first brush and the second brush are respectively connected to an external grounding grid. One end of the first brush is hinged to a fixing pin, so that the other end of the first brush naturally fits on the outer side of the upper part of the main shaft. Such a setting enables the other end of the first brush to better adapt to the concave and convex parts on the surface of the main shaft due to electric erosion, thereby reducing the wear caused by the concave and convex parts on the surface of the main shaft to the other end of the first brush, effectively improving the service life of the first brush. At the same time, a second brush is slidably installed in each second sleeve. By arranging a plurality of second brushes, the current generated on the main shaft can be conducted more stably, and when a single second brush is damaged, it will not affect the overall grounding effect of the main shaft. In this embodiment, by arranging a plurality of grounding paths on the main shaft, the current generated by the main shaft can be quickly released, effectively preventing potential accumulation, and effectively solving the problems that the brush heads of the existing grounding devices of steam turbines are easily worn and there is no spare brush in the grounding system. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] FIG Figure 1 is a front view structural schematic diagram of Embodiment 1.
[0013] FIG Figure 2 is an enlarged left view cross-sectional structural schematic diagram of Embodiment 1.
[0014] FIG Figure 3 is an enlarged right view cross-sectional structural schematic diagram of Embodiment 1.
[0015] The codes in the drawings are respectively: 1 is a steam turbine, 2 is a main shaft, 3 is a first bearing housing, 4 is a second bearing housing, 5 is a first sleeve, 6 is a fixing pin, 7 is a brush rod, 8 is a first brush head, 9 is a wire, 10 is a first terminal, 11 is a first fixing seat, 12 is a first bolt, 13 is a second sleeve, 14 is a second brush head, 15 is a brush braid, 16 is a second terminal, 17 is a spring, 18 is a second fixing seat, 19 is a second bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0016] The utility model is not limited by the following embodiments, and the specific implementation manners can be determined according to the technical solutions of the utility model and the actual situation.
[0017] In the utility model, for the convenience of description, the description of the relative position relationship of each component is carried out according to the layout mode of the attached drawings of the specification, such as: the position relationships of front, rear, upper, lower, left, right, etc. are determined according to the layout direction of the attached drawings of the specification. Figure 1 The position relationships of front, rear, upper, lower, left, right, etc. are determined according to the layout direction of the attached drawings of the specification. Figure 1 of the specification.
[0018] The following further describes the utility model in conjunction with the embodiments and the attached drawings:
[0019] Embodiment 1, as shown in FIGFigure 1 , 2 As shown in Figure 3, the above-mentioned shafting grounding device of the steam turbine unit includes a steam turbine 1, a first bearing box 3, a second bearing box 4, a first brush and a second brush. A main shaft 2 is provided in the steam turbine 1. A first bearing box 3 is provided on the left side of the steam turbine 1. The left part of the main shaft 2 is located inside the first bearing box 3. A first sleeve 5 is fixedly installed on the upper left side of the first bearing box 3. The first sleeve 5 is in the shape of a cylinder with an open rear end and a closed front end. A left-right fixed pin 6 is fixedly installed in the first sleeve 5. One end of the first brush is hinged to the fixed pin 6, and the other end of the first brush fits against the outer side of the upper part of the main shaft 2. A second bearing box 4 is provided on the right side of the steam turbine 1. The right part of the main shaft 2 is located inside the second bearing box 4. A plurality of second sleeves 13 are installed at intervals on the upper right side of the second bearing box 4. Each second sleeve 13 is in the shape of a cylinder with an open end close to the main shaft 2 and a closed end far from the main shaft 2. A second brush is slidably installed in each second sleeve 13, and one end of the second brush contacts the outer side of the main shaft 2.
[0020] During use, the first brush and the second brush are respectively connected to an external grounding grid. One end of the first brush is hinged to the fixed pin 6, so that the other end of the first brush naturally fits against the outer side of the upper part of the main shaft 2. Such a setting enables the other end of the first brush to better adapt to the concave and convex parts on the surface of the main shaft 2 due to electrical erosion, thereby reducing the wear caused by the concave and convex parts on the surface of the main shaft 2 to the other end of the first brush, and effectively improving the service life of the first brush. At the same time, a second brush is slidably installed in each second sleeve 13. By providing a plurality of second brushes, the current generated on the main shaft 2 can be conducted more stably, and when a single second brush is damaged, it will not affect the overall grounding effect of the main shaft 2; in this embodiment, by providing a plurality of grounding paths on the main shaft 2, the current generated by the main shaft 2 can be quickly released, effectively preventing potential accumulation, and effectively solving the problems that the brush heads of the existing grounding devices of steam turbines 1 are easily worn and there is no spare brush in the grounding system.
[0021] According to actual needs, the above-mentioned shafting grounding device of the steam turbine unit can be further optimized and / or improved:
[0022] Embodiment 2, as shown in the appendix Figure 1 , 2As shown, this embodiment is a further optimization of the above embodiment. A first connection hole communicating inside and outside is provided at the front end of the first sleeve 5, and a first terminal 10 is fixedly installed in the first connection hole. The first brush includes a brush rod 7, a first brush head 8 and a first terminal 10. The front part of the brush rod 7 is hinged to the fixing pin 6. A wire 9 is fixedly connected between the front end of the brush rod 7 and the first terminal 10. The rear end of the brush rod 7 extends out of the rear end of the first sleeve 5 and is fixedly installed with a first brush head 8. The lower part of the first brush head 8 is attached to the outer side of the upper part of the main shaft 2. The first brush head 8 is a known conductive brush in the prior art. During use, the first terminal 10 is connected to an external grounding network. The current generated by the main shaft 2 flows through the first brush head 8, the brush rod 7, the wire 9 and the first terminal 10 in sequence, and is finally led to the ground. The brush rod 7 is hinged to the fixing pin 6, so that the brush rod 7 can swing around the fixing pin 6 as an axis. When the brush rod 7 swings, it will drive the first brush head 8 to swing up and down, so that the first brush head 8 can naturally lap on the outer side of the upper part of the main shaft 2. In this embodiment, the first brush head 8 naturally laps on the outer side of the upper part of the main shaft 2, which can better adapt to the concave and convex parts on the surface of the main shaft 2 due to electro-erosion, thereby effectively reducing the wear rate between the first brush head 8 and the main shaft 2.
[0023] Embodiment 3. As shown in the attached Figure 1 、 3 As shown, this embodiment is a further optimization of the above embodiment. A second connection hole communicating inside and outside is provided at one end of the second sleeve 13 away from the main shaft 2, and a second terminal 16 is fixedly installed in the second connection hole. The second brush includes a second brush head 14, a brush braid 15, a second terminal 16 and a spring 17. The second brush head 14 is slidably installed inside the second sleeve 13. A brush braid 15 is fixedly connected between the second brush head 14 and the second terminal 16. A spring 17 is sleeved outside the brush braid 15. One end of the spring 17 is fixedly connected to the second brush head 14, and the other end of the spring 17 is fixedly connected to the second terminal 16. The second brush head 14 is a known carbon brush in the prior art. During use, the second terminal 16 is connected to an external grounding network. The current generated by the main shaft 2 flows through the second brush head 14, the brush braid 15 and the second terminal 16 in sequence, and is finally led to the ground. The spring 17 is used to provide axial elastic force so that the second brush can be tightly attached to the main shaft 2. The structure of the second brush in this embodiment is simple and the cost is low, which can reduce the cost of deploying multiple second brushes.
[0024] Embodiment 4. As shown in the attached Figure 1 、 2, as shown in FIGS. 3, this embodiment is a further optimization of the above embodiment. A first fixing seat 11 is sleeved outside the first sleeve 5. The right end of the first fixing seat 11 is fixedly connected to the upper left side of the first bearing box 3. A plurality of first screw holes penetrating through the inside and outside are spaced apart on the outside of the first sleeve 5. Second screw holes penetrating through the inside and outside are formed on the outside of the first fixing seat 11 corresponding to each first screw hole. A first bolt 12 is screwed into each first screw hole. One end of each first bolt 12 close to the first sleeve 5 passes through the second screw hole and is screwed into the corresponding first screw hole. When it is necessary to fix the first sleeve 5, the first bolts 12 are sequentially screwed into the first screw holes and the second screw holes, thereby firmly fixing the first sleeve 5 and the first fixing seat 11 together. When it is necessary to maintain or replace the first brush head 8 and the brush rod 7, each first bolt 12 is removed, and then the first sleeve 5 can be conveniently taken out to replace or maintain the first brush head 8 and the brush rod 7 inside it.
[0025] Embodiment 5, as shown in the attached Figure 1 , 2 , as shown in FIGS. 3, this embodiment is a further optimization of the above embodiment. A second fixing seat 18 is sleeved outside each second sleeve 13. The left end of each second fixing seat 18 is fixedly connected to the right side of the second bearing box 4. A plurality of third screw holes penetrating through the inside and outside are spaced apart along the circumference on the outside of the second sleeve 13. Fourth screw holes penetrating through the inside and outside are formed on the outside of the second fixing seat 18 corresponding to each third screw hole. A second bolt 19 is screwed into each fourth screw hole. One end of each second bolt 19 close to the second sleeve 13 passes through the fourth screw hole and is screwed into the corresponding third screw hole. When it is necessary to fix the second sleeve 13, each second bolt 19 is sequentially screwed into the corresponding third screw hole and the fourth screw hole, thereby firmly fixing the second sleeve 13 and the second fixing seat 18 together. When it is necessary to maintain or replace the second brush head 14, each second bolt 19 is removed, and then the second sleeve 13 can be conveniently taken out to replace or maintain the second brush head 14 inside it.
[0026] The above technical features constitute the embodiments of the present utility model, which have strong adaptability and implementation effects. Non-essential technical features can be added or subtracted according to actual needs to meet the requirements of different situations.
Claims
1. A steam turbine shaft grounding device, characterized in that It includes a steam turbine, a first bearing box, a second bearing box, a first brush and a second brush. A main shaft is arranged in the steam turbine. A first bearing box is arranged on the left side of the steam turbine. The left part of the main shaft is located on the inner side of the first bearing box. A first sleeve is fixedly installed on the left side of the upper part of the first bearing box. The first sleeve is in the shape of a cylinder with an open rear end and a closed front end. Left and right fixing pins are fixedly installed in the first sleeve. One end of the first brush is hingedly installed with the fixing pin, and the other end of the first brush is attached to the outer side of the upper part of the main shaft. A second bearing box is arranged on the right side of the steam turbine. The right part of the main shaft is located in the second bearing box. A plurality of second sleeves are installed at intervals on the right side of the upper part of the second bearing box. Each second sleeve is in the shape of a cylinder with an open end close to the main shaft and a closed end away from the main shaft. A second brush is slidably installed in each second sleeve, and one end of the second brush contacts the outer side of the main shaft.
2. The steam turbine shaft grounding device according to claim 1, characterized in that A first connecting hole communicating with the inside and outside is provided at the front end of the first sleeve, a first terminal is fixedly installed in the first connecting hole, the first brush comprises a brush rod, a first brush head and a first terminal, the front part of the brush rod is hinged to a fixing pin, a wire is fixedly connected between the front end of the brush rod and the first terminal, the rear end of the brush rod extends out of the rear end of the first sleeve and a first brush head is fixedly installed thereon, and the lower part of the first brush head is attached to the outer side of the upper part of the main shaft.
3. The steam turbine shaft grounding device according to claim 1 or 2, characterized in that A second connecting hole that penetrates inside and outside is opened at one end of the second sleeve away from the main shaft, and a second terminal is fixedly installed in the second connecting hole. The second brush includes a second brush head, a brush braid, a second terminal and a spring. The second brush head is slidably installed on the inner side of the second sleeve, and a brush braid is fixedly connected between the second brush head and the second terminal. A spring is sleeved on the outer side of the brush braid, one end of the spring is fixedly connected to the second brush head, and the other end of the spring is fixedly connected to the second terminal.
4. The steam turbine shaft grounding device according to claim 1 or 2, characterized in that A first fixing seat is mounted on the outside of the first sleeve, and the right end of the first fixing seat is fixedly connected to the left upper part of the first bearing box. A plurality of first screw holes that penetrate inside and outside are arranged at intervals on the outside of the first sleeve, and a second screw hole that penetrates inside and outside is arranged on the outside of the first fixing seat corresponding to each first screw hole position, and a first bolt is screwed in each first screw hole, and an end of each first bolt close to the first sleeve passes through the second screw hole and is screwed in the corresponding first screw hole.
5. The steam turbine shaft grounding device according to claim 3, characterized in that A first fixing seat is mounted on the outside of the first sleeve, and the right end of the first fixing seat is fixedly connected to the left upper part of the first bearing box. A plurality of first screw holes that penetrate inside and outside are arranged at intervals on the outside of the first sleeve, and a second screw hole that penetrates inside and outside is arranged on the outside of the first fixing seat corresponding to each first screw hole position, and a first bolt is screwed in each first screw hole, and an end of each first bolt close to the first sleeve passes through the second screw hole and is screwed in the corresponding first screw hole.
6. The steam turbine shaft grounding device according to claim 1, 2 or 5, characterized in that A second fixing seat is mounted on the outside of each second sleeve, and the left end of each second fixing seat is fixedly connected to the right side of the second bearing box. A plurality of third screw holes that penetrate inside and outside are provided at intervals along the circumference of the outside of the second sleeve, and a fourth screw hole that penetrates inside and outside is provided on the outside of the second fixing seat corresponding to each third screw hole position, and a second bolt is screwed in each fourth screw hole, and one end of each second bolt close to the second sleeve passes through the fourth screw hole and is screwed in the corresponding third screw hole.
7. The steam turbine shaft grounding device according to claim 3, characterized in that A second fixing seat is mounted on the outside of each second sleeve, and the left end of each second fixing seat is fixedly connected to the right side of the second bearing box. A plurality of third screw holes that penetrate inside and outside are provided at intervals along the circumference of the outside of the second sleeve, and a fourth screw hole that penetrates inside and outside is provided on the outside of the second fixing seat corresponding to each third screw hole position, and a second bolt is screwed in each fourth screw hole, and one end of each second bolt close to the second sleeve passes through the fourth screw hole and is screwed in the corresponding third screw hole.
8. The steam turbine shaft grounding device according to claim 4, characterized in that A second fixing seat is mounted on the outside of each second sleeve, and the left end of each second fixing seat is fixedly connected to the right side of the second bearing box. A plurality of third screw holes that penetrate inside and outside are provided at intervals along the circumference of the outside of the second sleeve, and a fourth screw hole that penetrates inside and outside is provided on the outside of the second fixing seat corresponding to each third screw hole position, and a second bolt is screwed in each fourth screw hole, and one end of each second bolt close to the second sleeve passes through the fourth screw hole and is screwed in the corresponding third screw hole.