阅读说明：本技术 一种发电机大轴接地装置 (Generator main shaft earthing device ) 是由 涂序亮 陈明 刘念庆 万春 叶圣桥 黄卫 蔡玉珍 李振东 邓炯 刘斌 于 2020-12-22 设计创作，主要内容包括：本发明公开了一种发电机大轴接地装置,属于发电机技术领域。一种发电机大轴接地装置,包括基板,以及活动连接在基板上的机架；其中,机架包括卡罩,卡罩上滑动连接有第一滑杆,第一滑杆下端固定连接有碳刷组件、上端固定连接挡板,还包括使碳刷组件与发电机大轴贴紧的弹力部,还包括接地部,接地部与碳刷组件连接；本发明通过拉动挡板通过第一滑杆拉动碳刷盒和碳刷本体向上移动,移动至大轴上方时,在第二弹簧的作用下使碳刷本体与大轴贴紧,从而保证碳刷本体与大罩的贴合,通过转动握把带动第一螺杆转动,进而使移动板在基板上方移动,进而通过立柱以及横杆带动卡罩移动,从而远离大轴便于碳刷本体的更换。(The invention discloses a grounding device for a large shaft of a generator, and belongs to the technical field of generators. A generator large shaft grounding device comprises a base plate and a frame movably connected to the base plate; the machine frame comprises a clamping cover, a first sliding rod is connected onto the clamping cover in a sliding mode, a carbon brush assembly is fixedly connected to the lower end of the first sliding rod, a baffle is fixedly connected to the upper end of the first sliding rod, the machine frame further comprises an elastic portion enabling the carbon brush assembly to be tightly attached to a large shaft of the generator, and the machine frame further comprises a grounding portion, and the grounding portion is connected with the carbon brush assembly; according to the invention, the carbon brush box and the carbon brush body are pulled to move upwards by pulling the baffle through the first sliding rod, and when the carbon brush box and the carbon brush body move to the position above the large shaft, the carbon brush body is tightly attached to the large shaft under the action of the second spring, so that the carbon brush body is attached to the large cover, the grip is rotated to drive the first screw rod to rotate, the moving plate moves above the base plate, and the clamping cover is driven to move through the upright post and the cross rod, so that the carbon brush body is far away from the large shaft, and the replacement of the carbon.)

1. A generator large shaft grounding device is characterized by comprising

The device comprises a base plate (1) and a machine frame movably connected to the base plate (1);

the rack comprises a clamping cover (3), a first sliding rod (301) is connected onto the clamping cover (3) in a sliding mode, a carbon brush assembly is fixedly connected to the lower end of the first sliding rod (301), a baffle (303) is fixedly connected to the upper end of the first sliding rod, the rack further comprises an elastic portion enabling the carbon brush assembly to be tightly attached to a large shaft of a generator, and the rack further comprises a grounding portion, and the grounding portion is connected with the carbon brush assembly.

2. The generator main shaft grounding device according to claim 1, wherein the frame further comprises

A moving plate (2); the grounding device comprises a base plate (1), a moving plate (2) and a column (201) fixedly connected to the moving plate (2), wherein a cross rod (202) is fixedly connected to the column (201), the grounding portion is connected to the cross rod (202), the moving plate (2) is connected to the base plate (1) in a sliding mode, and a driving portion used for driving the moving plate (2) to move is connected to the base plate (1).

3. The generator large shaft grounding device according to claim 2, wherein the driving portion comprises a first support (101) and a second support (102) fixedly connected to the base plate (1), the first support (101) is rotatably connected with a first screw (103), the moving plate (2) is provided with a threaded hole corresponding to the first screw (103), the first support (101) is fixedly connected with a handle (1031), the handle (1031) is fixedly connected with the first screw (103), the second support (102) is fixedly connected with a second sliding rod (104), the moving plate (2) is provided with a sliding hole, and the moving plate (2) is slidably connected with the second sliding rod (104) through the sliding hole.

4. The generator main shaft grounding device according to claim 3, wherein a first spring (105) is sleeved on the second sliding rod (104), and two ends of the first spring (105) respectively abut against the second support (102) and the moving plate (2).

5. The generator large shaft grounding device according to claim 2, wherein the carbon brush assembly comprises a carbon brush box (302) and a carbon brush body (4) fixedly connected in the carbon brush box (302), a snap ring (402) is connected to the top of the carbon brush body (4) through a wire (401), a through hole (304) for the wire (401) to pass through is formed in the snap ring (3), and the snap ring (402) is connected to the grounding portion.

6. The generator large shaft grounding device according to claim 5, wherein the grounding portion comprises a second screw (5), a through groove is formed in the cross rod (202), the second screw (5) is slidably connected in the through groove, two first nuts (501) are threadedly connected to the second screw (5), the two first nuts (501) are respectively located at the upper end and the lower end of the cross rod (202), the snap ring (402) is sleeved on the second screw (5), a second nut (502) is further connected to the second screw (5), and the snap ring (402) is located between the second nut (502) and the first nut (501).

7. The generator large shaft grounding device according to claim 5 or 6, wherein the elastic portion comprises a second spring (305), the second spring (305) is sleeved on the first sliding rod (301), and two ends of the second spring (305) respectively abut against the card cover (3) and the carbon brush box (302).

Technical Field

The invention relates to the technical field of generators, in particular to a grounding device for a large shaft of a generator.

Background

The grounding device for the large shaft of the generator is designed to be grounded at the contact part of a copper braid and the large shaft when leaving factory, the device is fixed above the large shaft of the end cover of the generator, and the large shaft is pressed by a pressing block and the gravity of the device to realize the grounding of the large shaft. Many problems are exposed during many years of operation.

In the running steam turbine generator unit, because the exciting current contains a certain alternating current component, distributed capacitance exists between the rotor winding and the large shaft, and the large shaft can generate an electromotive force to the ground due to the electromagnetic induction phenomenon, which is called shaft voltage. If the large shaft is in poor grounding, the oil film of the bearing bush can be broken down to discharge electricity to cause electric shock erosion on the bearing bush, meanwhile, the oil quality of lubricating oil is degraded, the running environment of the bearing bush is further degraded, and the service life of the large shaft is influenced.

The starting test affects the safety: when the generator is started, due to the fact that the generator runs at a high speed, personal safety can be affected when the grounding device needs to be detached to carry out a starting voltage-pumping measurement test, and when the grounding device is in poor contact in the running process, unit running safety can be affected when replacement processing is carried out.

Disclosure of Invention

The invention aims to solve the problems that the existing carbon brush is not tightly contacted with a large shaft of a generator and is inconvenient to replace, and provides a grounding device for the large shaft of the generator.

In order to achieve the purpose, the invention adopts the following technical scheme:

a generator large shaft grounding device comprises a base plate and a frame movably connected to the base plate; the machine frame comprises a clamping cover, a first sliding rod is connected to the clamping cover in a sliding mode, a carbon brush assembly is fixedly connected to the lower end of the first sliding rod, a baffle is fixedly connected to the upper end of the first sliding rod, the machine frame further comprises an elastic portion enabling the carbon brush assembly to be tightly attached to a large shaft of a generator, and the machine frame further comprises a grounding portion, and the grounding portion is connected with the carbon brush assembly.

Preferably, the rack further comprises a moving plate; the grounding part is connected to the cross rod, the moving plate is connected to the base plate in a sliding mode, and the base plate is connected to a driving part used for driving the moving plate to move.

Preferably, the driving portion comprises a first support and a second support which are fixedly connected to the base plate, the first support is rotatably connected with a first screw, a threaded hole corresponding to the first screw is formed in the movable plate, a handle is fixedly connected to the first support, the handle is fixedly connected to the first screw, a second slide bar is fixedly connected to the second support, a slide hole is formed in the movable plate, and the movable plate is slidably connected to the second slide bar through the slide hole.

Preferably, the second slide bar is sleeved with a first spring, and two ends of the first spring respectively abut against the second support and the moving plate.

Preferably, the carbon brush assembly comprises a carbon brush box and a carbon brush body fixedly connected in the carbon brush box, the top of the carbon brush body is connected with a clamping ring through a wire, the clamping ring is provided with a through hole for the wire to pass through, and the clamping ring is connected with the grounding part.

Preferably, the grounding part comprises a second screw rod, a through groove is formed in the cross rod, the second screw rod is slidably connected in the through groove, two first nuts are connected to the second screw rod in a threaded manner, the two first nuts are respectively located at the upper end and the lower end of the cross rod, the clamping ring is sleeved on the second screw rod, the second screw rod is further connected with a second nut, and the clamping ring is located between the second nut and the first nut.

Preferably, the elastic part comprises a second spring, the second spring is sleeved on the first sliding rod, and two ends of the second spring respectively abut against the clamping cover and the carbon brush box.

Compared with the prior art, the invention provides a generator large shaft grounding device which has the following beneficial effects:

through pulling baffle through first slide bar pulling carbon brush box and carbon brush body rebound, when removing to the main shaft top, make carbon brush body and main shaft paste tightly under the effect of second spring to guarantee the laminating of carbon brush body and main cover, can set up two carbon brush subassemblies at the upper and lower both ends of card cover, thereby increased electrically conductive area of contact, the effectual axle voltage that has reduced has guaranteed the security of unit operation.

The handle is rotated to drive the first screw rod to rotate, so that the movable plate moves above the base plate, and the clamping cover is driven to move through the upright posts and the cross rods, so that the carbon brush body is convenient to replace far away from the large shaft.

Drawings

Fig. 1 is a schematic perspective view of a generator large shaft grounding device according to the present invention;

FIG. 2 is a front view of a generator main shaft grounding device according to the present invention;

FIG. 3 is a top view of a generator main shaft grounding device according to the present invention;

fig. 4 is a partial structural schematic diagram of a generator large shaft grounding device provided by the invention.

In the figure: 1. a substrate; 101. a first support; 102. a second support; 103. a first screw; 1031. a grip; 104. a second slide bar; 105. a first spring; 2. moving the plate; 201. a column; 202. a cross bar; 3. a clamping cover; 301. a first slide bar; 302. a carbon brush box; 303. a baffle plate; 304. a through hole; 305. a second spring; 4. a carbon brush body; 401. a wire; 402. a snap ring; 5. a second screw; 501. a first nut; 502. a second nut.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Referring to fig. 1-4, a generator large shaft grounding device comprises a base plate 1 and a frame movably connected to the base plate 1; the rack comprises a clamping cover 3, a first sliding rod 301 is connected onto the clamping cover 3 in a sliding mode, a carbon brush assembly is fixedly connected to the lower end of the first sliding rod 301, a baffle 303 is fixedly connected to the upper end of the first sliding rod 301, the rack further comprises an elastic portion enabling the carbon brush assembly to be tightly attached to a large shaft of a generator, and the rack further comprises a grounding portion, and the grounding portion is connected with the carbon brush assembly.

Referring to fig. 1-3, the frame further includes a moving plate 2; and the upright column 201 is fixedly connected to the moving plate 2, the cross bar 202 is fixedly connected to the upright column 201, the grounding part is connected to the cross bar 202, the moving plate 2 is connected to the base plate 1 in a sliding manner, and the base plate 1 is connected to a driving part for driving the moving plate 2 to move.

Referring to fig. 1-3, the driving portion includes a first support 101 and a second support 102 fixedly connected to the base plate 1, the first support 101 is rotatably connected to a first screw 103, the moving plate 2 is provided with a threaded hole corresponding to the first screw 103, the first support 101 is fixedly connected to a handle 1031, the handle 1031 is fixedly connected to the first screw 103, the second support 102 is fixedly connected to a second slide bar 104, the moving plate 2 is provided with a slide hole, and the moving plate 2 is slidably connected to the second slide bar 104 through the slide hole.

Referring to fig. 1 to 3, the second slide bar 104 is sleeved with a first spring 105, two ends of the first spring 105 respectively abut against the second support 102 and the moving plate 2, the moving plate 2 moves stably due to the existence of the second slide bar 104, and the first screw 103 is connected with the moving plate 2 by a rectangular thread, so that the self-locking performance is achieved, and the self-locking effect is better due to the existence of the first spring 105 so as to enable the tooth surface of the rectangular thread to be tightly adhered.

Referring to fig. 1, 2 and 4, the carbon brush assembly includes a carbon brush box 302 and a carbon brush body 4 fixedly connected in the carbon brush box 302, a snap ring 402 is connected to the top of the carbon brush body 4 through a wire 401, a through hole 304 for the wire 401 to pass through is formed in the snap ring 3, and the snap ring 402 is connected to the ground portion.

Referring to fig. 1, 2 and 4, the grounding portion includes a second screw rod 5, a through groove is formed in the cross rod 202, the second screw rod 5 is slidably connected in the through groove, two first nuts 501 are connected to the second screw rod 5 through threads, the two first nuts 501 are respectively located at the upper end and the lower end of the cross rod 202, the snap ring 402 is sleeved on the second screw rod 5, the second screw rod 5 is further connected with a second nut 502, and the snap ring 402 is located between the second nut 502 and the first nut 501.

Referring to fig. 1 to 4, the elastic portion includes a second spring 305, the second spring 305 is sleeved on the first slide bar 301, and two ends of the second spring 305 respectively abut against the card cover 3 and the carbon brush box 302.

When the carbon brush is used, the handle 1031 is rotated to drive the first screw 103 to rotate, so that the moving plate 2 moves above the base plate 1, the clamping cover 3 is driven to move through the upright column 201 and the cross rod 202, and the large shaft is far away, at the moment, when the carbon brush body 4 is installed, the clamping ring 402 and the lead 401 penetrate through the through hole 304 on the clamping cover 3, then the carbon brush body 4 in interference fit is clamped into the carbon brush box 302 to be fixed, then the second screw 5 is inserted into the through groove on the cross rod 202, the two first nuts 501 are screwed on the second screw 5, the second screw 5 is fixed on the cross rod 202 through the two first nuts 501, the clamping ring 402 on the lead 401 is sleeved on the second screw 5 and fixed through the second nut 502, finally, the ground lead is connected with the second screw 5, after the carbon brush is installed, the moving plate 2 is driven to move by rotating the handle 1031 under the rotating action of the first screw 103, the drive card cover 3 is close to the large shaft, then through pulling baffle 303 through first slide bar 301 pulling carbon brush box 302 and carbon brush body 4 rebound, when moving to the large shaft top, make carbon brush body 4 and large shaft paste tightly under the effect of second spring 305, thereby guarantee the laminating of carbon brush body 4 and large cover, can set up two carbon brush subassemblies at the upper and lower both ends of card cover 3, thereby conductive area of contact has been increased, the effectual axle voltage that has reduced, the security of unit operation has been guaranteed.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.