Large-collar grounding device for generator rotor
By using a ring grounding device and a cobalt-based high-temperature alloy wire on the large shaft of the generator, the problems of poor contact, fast wear and regular replacement in traditional grounding devices are solved, and the effect of stabilizing the measurement signal and extending the service life is achieved.
Patent Information
- Application Number
- CN202421651651.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-12
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-07-12
AI Technical Summary
The large shaft grounding device of traditional generators has economic and safety hazards caused by poor contact, rapid wear and regular replacement.
The ring-type grounding device is adopted, and the brush bundle is evenly installed on the inner wall of the ring-type mechanism. The bristles are inclined relative to the rotation direction of the large axis. They are flexible contact with conductive metal brush bundles and are made of cobalt-based high-temperature alloy wire.
It solves the problem of poor contact of carbon brushes when the large shaft is eccentric, extends the service life of the brush beam, and avoids the costs and safety hazards caused by regular replacement.
Smart Images
Figure CN222827109U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of safe operation monitoring of large generators, in particular to a large shaft ring type grounding device for a generator rotor. Background Art
[0002] As the core component of the power system, the shaft voltage measurement and monitoring of the generator's operating status is crucial. According to the operating specifications, the shaft voltage of the generator needs to be measured regularly. The traditional connection between the rotating parts and the stationary parts is to lead out and measure the shaft voltage signal of the main shaft through the grounding carbon brush mechanism. Specifically, the main shaft grounding mechanism of the generator adopts the grounding method of two carbon brushes, and the voltage signal on the main shaft enters the input end of the measuring device through the grounding carbon brush and the mechanism lead installed on the carbon brush.
[0003] This method of extracting signals through carbon brushes has the following problems:
[0004] 1. When the large shaft is eccentric, there will be a problem of poor contact of the carbon brush, which will lead to unstable measurement signals;
[0005] 2. The carbon brush at the end of the main shaft has a problem of excessive vibration, which causes the carbon brush to wear too quickly;
[0006] 3. The carbon brushes need to be replaced regularly due to wear caused by the rotation of the large shaft, which creates economic costs and safety hazards for personnel during the replacement process.
[0007] Therefore, a new type of generator rotor large shaft ring type grounding device is needed to solve the above problems. Utility Model Content
[0008] The utility model aims to propose a generator rotor shaft ring-type grounding device in view of the deficiencies in the prior art, comprising a brush bundle, a ring-type mechanism, a ring-type mechanism fixing hole, fixing screws, a shell, and a dust cover; wherein the brush bundle is evenly installed on the inner wall circumference of the ring-type mechanism, and the bristles of the brush bundle are arranged according to a regular inclination angle relative to the rotation direction of the shaft; the ring-type mechanism fixing holes and fixing screws are evenly arranged on the side wall circular surface of the ring-type mechanism; the shell and the dust cover are both arranged on the ring-type mechanism, and the shell is connected to the dust cover.
[0009] The tilt angle is 10 to 15 degrees.
[0010] The brush bundle is made of cobalt-based high-temperature alloy wire.
[0011] The number of brush bundles is 12 sets.
[0012] The difference between the inner diameter and the outer diameter of the ring mechanism is 30 mm.
[0013] The thickness of the ring mechanism is 13 mm.
[0014] The number of the ring mechanism fixing holes is 4.
[0015] The number of fixing screws is 4.
[0016] The minimum central angle formed by the fixing hole of the ring mechanism, the fixing screw and the center of the device is 30 degrees.
[0017] The beneficial effects of the utility model are:
[0018] The circular arrangement solves the problem of poor contact of carbon brushes when the large shaft is eccentric, thereby stabilizing the measurement signal. The flexible contact of the conductive metal brush bundle solves the problem of rapid wear of the carbon brushes when the end of the large shaft has a large runout. The conductive metal brush bundle is made of cobalt-based high-temperature alloy wire and can run for a long time without replacement, saving costs and avoiding potential safety hazards to personnel. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a front view of the large shaft ring type grounding device of the generator rotor of the utility model.
[0020] Figure 2 It is a side view of the large shaft ring type grounding device of the generator rotor of the utility model. DETAILED DESCRIPTION
[0021] The utility model provides a large shaft ring type grounding device for a generator rotor, and the utility model is further described below in conjunction with the accompanying drawings and specific embodiments.
[0022] Figure 1 , Figure 2 They are respectively the front view and the side view of the annular grounding device for the main shaft of the generator rotor of the utility model. The device comprises a brush bundle 1, an annular mechanism 2, an annular mechanism fixing hole 3, fixing screws 4, a housing 5, and a dust cover 6; wherein, 12 groups of brush bundles 1 made of cobalt-based high-temperature alloy wires are evenly installed on the inner wall circumference of the annular mechanism 2, serving as the voltage contact connection of the rotor main shaft, and have the characteristics of low brittleness and high toughness. The bristles of the brush bundle 1 are arranged regularly at an inclination angle of 10 to 15 degrees relative to the rotation direction of the main shaft to reduce the wear of the bristles, so that the bristles can more easily adapt to the manufacturing error and thermal deformation of the rotor, etc., and can quickly rebound after the rotor is instantly displaced in a large radial direction to maintain good contact. Four annular mechanism fixing holes 3 and four fixing screws 4 are evenly arranged on the side wall circular surface of the annular mechanism 2, and the difference between the inner diameter and the outer diameter of the annular mechanism 2 is 30 mm, and the thickness is 13 mm. wherein, the minimum central angle formed by the annular mechanism fixing hole 3, the fixing screw 4 and the center of the device is 30 degrees. The housing 5 and the dust cover 6 are both disposed on the ring-shaped mechanism 2 , and the housing 5 is connected to the dust cover 6 .
[0023] In addition, the ring-shaped mechanism 2 is fixed on the rotor housing. Since the ring-shaped mechanism 2 is a conductor, the lead wire is fixed in the ring-shaped mechanism fixing hole 3 by bolts, and the two ends are respectively connected to the measuring instrument and the brush bundle 1.
[0024] The process of measuring shaft voltage by this device is as follows: when the main shaft of the generator rotor rotates, the shaft voltage will be induced due to the action of the magnetic field. During the rotation process, the main shaft will contact the brush bundle 1 in the surrounding circle, and the shaft voltage will be transmitted. The transmitted voltage signal will then enter the measuring instrument through the lead wire, and then the voltage size will be displayed on the instrument.
[0025] The utility model solves the problem of poor contact of carbon brushes when the main shaft is eccentric through circular arrangement, thereby stabilizing the measurement signal; the problem of rapid wear of carbon brushes when the end of the main shaft has large vibrations is solved through flexible contact of the conductive metal brush bundle; the conductive metal brush bundle is made of cobalt-based high-temperature alloy wire and can operate for a long time without replacement, thus saving costs and avoiding potential safety hazards to personnel.
Claims
1. A large shaft ring type grounding device for a generator rotor, characterized in that: The invention comprises a brush bundle (1), an annular structure (2), an annular structure fixing hole (3), fixing screws (4), a shell (5), and a dust cover (6); wherein the brush bundle (1) is evenly mounted on the inner wall circumference of the annular structure (2), and the bristles of the brush bundle (1) are arranged regularly at an inclination angle relative to the rotation direction of the main shaft; the annular structure fixing hole (3) and the fixing screws (4) are evenly arranged on the side wall circular surface of the annular structure (2); the shell (5) and the dust cover (6) are both arranged on the annular structure (2), and the shell (5) is connected to the dust cover (6).
2. The generator rotor large shaft ring type grounding device according to claim 1, characterized in that: The inclination angle is 10 to 15 degrees.
3. The generator rotor large shaft ring type grounding device according to claim 1, characterized in that: The brush bundle (1) is made of cobalt-based high-temperature alloy wire.
4. The generator rotor large shaft ring type grounding device according to claim 1 or 3, characterized in that: The number of the brush bundles (1) is 12 groups.
5. The generator rotor large shaft ring type grounding device according to claim 1, characterized in that: The difference between the inner diameter and the outer diameter of the annular structure (2) is 30 mm.
6. The generator rotor large shaft ring type grounding device according to claim 1 or 5, characterized in that: The thickness of the annular structure (2) is 13 mm.
7. The generator rotor large shaft ring type grounding device according to claim 1, characterized in that: The number of the annular mechanism fixing holes (3) is 4.
8. The generator rotor large shaft ring type grounding device according to claim 1 or 7, characterized in that: The number of the fixing screws (4) is 4.
9. The generator rotor large shaft ring type grounding device according to claim 8, characterized in that: The minimum central angle formed by the annular mechanism fixing hole (3), the fixing screw (4) and the center of the device is 30 degrees.