CN113708543B

CN113708543B - Electric generator

Info

Publication number: CN113708543B
Application number: CN202110957252.3A
Authority: CN
Inventors: 李剑锋; 穆恩元; 赵朝古拉; 李金鹏; 李杨
Original assignee: Huaneng Tongliao Wind Power Co Ltd
Current assignee: Huaneng Tongliao Wind Power Co Ltd
Priority date: 2021-08-18
Filing date: 2021-08-18
Publication date: 2022-05-27
Anticipated expiration: 2041-08-18
Also published as: DE202022103577U1; CN113708543A

Abstract

The invention relates to the technical field of generators and discloses a generator, which comprises a rotating shaft, a grounding ring, a friction pad and a grounding electric brush, wherein the rotating shaft is connected with the grounding ring through a shaft; the grounding ring is sleeved on the rotating shaft and is fixedly connected with the rotating shaft; the number of the friction pads is multiple; the plurality of friction pads are respectively in an arc shape, are respectively attached to the outer side surface of the grounding ring, and are distributed at equal intervals around the axis of the rotating shaft; the number of the grounding electric brushes is multiple; the plurality of grounding brush rings are arranged on the outer side of the grounding ring at equal intervals around the axis of the rotating shaft; wherein, the number of the grounding electric brushes is twice of that of the friction pads; and setting a central angle between two adjacent grounding electric brushes as a predetermined angle, wherein the central angles of the plurality of friction pads are respectively larger than the predetermined angle, and each grounding electric brush can be sequentially abutted with each friction pad when the rotating shaft rotates. According to the invention, a plurality of independent friction pads which are convenient to assemble and disassemble are arranged between the grounding electric brush and the grounding ring, so that when the grounding ring needs to be maintained, the friction pads can be disassembled and replaced, and the integral disassembly of the power connection ring is not required.

Description

Electric generator

Technical Field

The invention relates to the technical field of generators, in particular to a generator.

Background

A bearing is one of the important parts of a generator, and a bearing failure is also one of the major failures of a generator.

There are many forms of bearing failure, one of which is the bearing insulation effect that causes electrical current to flow through the bearing causing galvanic corrosion of the bearing.

For this reason, in the prior art, a grounding ring and a grounding brush are generally disposed on a rotating shaft of a generator, so that current on the rotating shaft flows into the ground through the grounding ring and the grounding brush without passing through a bearing, thereby avoiding the occurrence of electric corrosion on the bearing.

However, in the prior art, because there is relative rotation between ground ring and the ground brush, consequently, there is friction between ground ring and the ground brush, and after using for a period of time, the ground ring takes place wearing and tearing, needs to carry out whole change to the ground ring to guarantee the ground effect.

The mode of integrally replacing the grounding ring is not energy-saving and environment-friendly.

Disclosure of Invention

The purpose of the invention is: provided is a generator in which a grounding ring does not need to be entirely replaced.

In order to achieve the above object, the present invention provides a generator, comprising a rotating shaft, a ground ring, a friction pad, and a ground brush; the grounding ring is sleeved on the rotating shaft and is fixedly connected with the rotating shaft; the number of the friction pads is multiple; the plurality of friction pads are respectively in an arc shape, are respectively attached to the outer side surface of the grounding ring, and are distributed around the axis of the rotating shaft at equal intervals; the number of the grounding electric brushes is multiple; the grounding brushes are arranged on the outer side of the grounding ring at equal intervals around the axis of the rotating shaft; wherein the number of the grounding brushes is twice that of the friction pads; and setting a central angle between two adjacent grounding electric brushes as a predetermined angle, wherein the central angles of the plurality of the friction pads are respectively greater than the predetermined angle, and each grounding electric brush can be abutted with each friction pad in sequence when the rotating shaft rotates.

Furthermore, the inner side surface of each friction pad is respectively provided with a clamping groove with an opening facing the grounding ring, the grounding ring is respectively clamped in the clamping groove of each friction pad, and the outer side surface of the grounding ring is respectively abutted against the bottom wall of the clamping groove of each friction pad.

Further, the device also comprises a plurality of first bolts and a plurality of second bolts; the grounding ring is provided with a left end face and a right end face, the left end face is provided with a plurality of first screw holes, and the right end face is provided with a plurality of second screw holes respectively; the first bolts, the second bolts, the first screw holes, the second screw holes and the friction pads are in one-to-one correspondence; each first bolt penetrates through the corresponding friction pad and is in threaded connection with the corresponding first screw hole, and each second bolt penetrates through the corresponding friction pad and is in threaded connection with the corresponding second screw hole.

Further, the device also comprises a base and a bearing; the base is provided with a mounting hole for the rotating shaft to pass through; a plurality of the grounding brushes are respectively arranged on the base; the bearing is sleeved on the rotating shaft and arranged in the mounting hole; the bearing and the grounding ring are arranged at intervals in the axis direction of the rotating shaft.

Furthermore, each grounding electric brush comprises a frame body, an electric brush body and an elastic piece; the support body is installed just have the edge on the base the slip passageway that the radial direction of pivot extends, the brush body is slided and is established in the slip passageway, the elastic component be used for to the brush body applies the orientation the pretightning force of pivot direction.

Furthermore, the device also comprises a cover body which covers one end of the rotating shaft; the base and the cover body are connected and enclose to form an accommodating space, and the grounding ring and the grounding electric brush are respectively arranged in the accommodating space.

Furthermore, a plurality of through holes extending along the radial direction of the rotating shaft are respectively arranged on the inner wall of the cover body; in each grounding electric brush, the sliding channel is a through hole with two open ends, and the electric brush body is in a strip structure; the through holes correspond to the grounding electric brushes one by one, and in each grounding electric brush, one end of the electric brush body, which is far away from the rotating shaft, penetrates through the corresponding through hole; the outer side surface of each friction pad is respectively provided with a protrusion which is in smooth transition with the outer side surface of the friction pad and is used for driving the brush body in each grounding brush to slide out along the radial direction of the rotating shaft; each of the friction pads and each of the protrusions are made of a wear-resistant material.

Further, one end of the brush body close to the rotating shaft is formed with a tip for abutting against the friction pad.

Further, the wear-resistant material is wear-resistant rubber.

Further, the number of the friction pads is two, and the number of the grounding brushes is four; the predetermined angle is 90 °, and the central angle of the friction pad is 100 °.

Compared with the prior art, the generator provided by the embodiment of the invention has the beneficial effects that:

in the generator provided by the embodiment of the invention, the plurality of independent friction pads which are convenient to assemble and disassemble are arranged between the grounding electric brush and the grounding ring, so that when the grounding ring needs to be maintained, the friction pads can be disassembled and replaced without integrally disassembling the grounding ring. Meanwhile, the number and the shape of the friction pads and the grounding electric brushes are arranged, so that the friction pads can be always abutted against at least one grounding electric brush, and the grounding stability is ensured.

Drawings

Fig. 1 is a sectional view of an end portion at a rotating shaft of a generator according to an embodiment of the present invention.

Fig. 2 is an enlarged view of a portion a in fig. 1 of the generator according to the embodiment of the present invention.

Fig. 3 is an enlarged view of fig. 1 at B of the generator according to the embodiment of the present invention.

Fig. 4 is a cross-sectional view of a hair area grounding brush of an embodiment of the present invention.

Fig. 5 is a cross-sectional view at C-C of fig. 1 of a generator of an embodiment of the present invention.

Fig. 6 is a structural view of the generator according to the embodiment of the present invention when the rotating shaft shown in fig. 5 is rotated to another position.

In the figure, 1, a rotating shaft; 2. a ground ring; 21. a first screw hole; 22. a second screw hole; 3. a friction pad; 31. a card slot; 32. a protrusion; 4. a grounding brush; 41. a frame body; 411. a slide channel; 42. an electric brush body; 421. a tip; 43. an elastic member; 5. a first bolt; 6. a second bolt; 7. a base; 8. a bearing; 9. a cover body; 91. and a through hole.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of 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 considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1 to 6, a generator according to a preferred embodiment of the present invention includes a rotating shaft 1, a ground ring 2, a friction pad 3 and a ground brush 4; the grounding ring 2 is sleeved on the rotating shaft 1 and is fixedly connected with the rotating shaft 1; the number of the friction pads 3 is plural; the plurality of friction pads 3 are respectively arc-shaped, the plurality of friction pads 3 are respectively attached to the outer side surface of the grounding ring 2, and the plurality of friction pads 3 are distributed around the axis of the rotating shaft 1 at equal intervals; the number of the grounding brushes 4 is multiple; a plurality of the grounding brushes 4 are arranged on the outer side of the grounding ring 2 at equal intervals around the axis of the rotating shaft 1; wherein the number of the grounding brushes 4 is twice that of the friction pads 3; the central angle between two adjacent grounding electric brushes 4 is set as a predetermined angle, the central angles of the plurality of friction pads 3 are respectively greater than the predetermined angle, and each grounding electric brush 4 can be sequentially abutted against each friction pad 3 when the rotating shaft 1 rotates.

When the electric brush is used, the rotating shaft 1 rotates to drive the grounding ring 2 and the friction pad 3 to rotate, and the grounding electric brush 4 is kept still. In the process of rotating the rotating shaft 1, the friction pads 3 sequentially pass through the grounding brushes 4, and because the number of the friction pads 3 is half of that of the grounding brushes 4 and the friction pads 3 and the grounding brushes 4 are arranged around the axis of the rotating shaft 1 at equal intervals, the central angle between the adjacent friction pads 3 is equal to twice of the predetermined angle.

For one of the friction pads 3, when passing through the adjacent three grounding brushes 4, first, the front end of the friction pad 3 contacts the first grounding brush 4, then, the front end of the friction pad 3 contacts the second grounding brush 4, then, the rear end of the friction pad 3 is separated from the first grounding brush 4, and finally, the front end of the friction pad 3 contacts the third grounding brush 4. This is repeated, each friction pad 3 being in constant contact with at least one grounding brush 4, ensuring that the current on the shaft 1 can be conducted to ground via the friction pads 3 and the grounding brushes 4.

In the generator of the embodiment, a plurality of single friction pads 3 which are convenient to assemble and disassemble are arranged between the grounding brush 4 and the grounding ring 2, when the grounding ring 2 needs to be maintained, the friction pads 3 can be disassembled and replaced, and the whole power connection ring does not need to be disassembled. Meanwhile, the number and the shape of the friction pad 3 and the grounding brush 4 are set, so that the friction pad 3 can be always abutted to at least one grounding brush 4, and the grounding stability is ensured.

Further, in an embodiment, referring to fig. 1 to 6, the inner side surface of each friction pad 3 is respectively provided with a slot 31 with an opening facing the ground ring 2, the ground ring 2 is respectively clamped in the slot 31 of each friction pad 3, and the outer side surface of the ground ring 2 is respectively abutted against the bottom wall of the slot 31 of each friction pad 3.

In the present embodiment, when the friction pad 3 is attached and detached, the friction pad 3 is simply engaged with the ground ring 2 or pulled out from the ground ring 2, which facilitates the attachment and detachment and facilitates the maintenance of the ground ring 2.

Further, in an embodiment, please refer to fig. 1 to 6, further comprising a plurality of first bolts 5 and a plurality of second bolts 6; the grounding ring 2 is provided with a left end face and a right end face, the left end face is provided with a plurality of first screw holes 21, and the right end face is provided with a plurality of second screw holes 22; a plurality of the first bolts 5, a plurality of the second bolts 6, the first screw holes 21, a plurality of the second screw holes 22, and a plurality of the friction pads 3 are in one-to-one correspondence; each first bolt 5 penetrates through the corresponding friction pad 3 and is in threaded connection with the corresponding first screw hole 21, and each second bolt 6 penetrates through the corresponding friction pad 3 and is in threaded connection with the corresponding second screw hole 22.

In this embodiment, when the friction pad 3 is mounted and dismounted, the first bolt 5 and the second bolt 6 need to be screwed in or out, so that the stability of the friction pad 3 on the grounding ring 2 is improved, and the relative position of the friction pad 3 and the grounding ring 2 is ensured to be unchanged when the friction pad 3 rotates along with the grounding ring 2.

Further, in one embodiment, please refer to fig. 1 to 6, further comprising a base 7 and a bearing 8; the base 7 is provided with a mounting hole for the rotating shaft 1 to pass through; a plurality of the grounding brushes 4 are respectively provided on the base 7; the bearing 8 is sleeved on the rotating shaft 1 and arranged in the mounting hole; the bearing 8 and the grounding ring 2 are arranged at intervals in the axial direction of the rotating shaft 1.

In the present embodiment, when the grounding brush 4 is provided on the base 7, the bearing 8 is provided on the base 7 at the same time, that is, the fixing structure of the grounding brush 4 and the bearing 8 is integrated, and the structure is simplified.

Further, in an embodiment, referring to fig. 1 to 6, each of the grounding brushes 4 includes a frame 41, a brush body 42 and an elastic element 43; the support body 41 is installed on the base 7 and has an edge the slip passage 411 that the radial direction of pivot 1 extends, brush body 42 slides and establishes in the slip passage 411, elastic component 43 is used for to brush body 42 applys the orientation the pretightning force of pivot 1 direction.

In this embodiment, the elastic member 43 is arranged to apply a pre-tightening force to the brush body 42, so as to ensure that the brush body 42 can be firmly abutted against the grounding ring 2 when the rotating shaft 1 rotates.

Further, in an embodiment, please refer to fig. 1 to 6, further comprising a cover 9 covering one end of the rotating shaft 1; the base 7 and the cover body 9 are connected and enclose to form an accommodating space, and the grounding ring 2 and the grounding electric brush 4 are respectively arranged in the accommodating space.

In the present embodiment, in order to protect the grounding brush 4 and the grounding ring 2, the cover 9 is provided to entirely cover the end portion of the rotating shaft 1, the grounding brush 4, and the grounding ring 2.

Further, in an embodiment, referring to fig. 1 to 6, a plurality of through holes 91 extending along a radial direction of the rotating shaft 1 are respectively formed on an inner wall of the cover 9; in each grounding brush 4, the sliding channel 411 is a through hole with two open ends, and the brush body 42 is in a strip structure; the through holes 91 correspond to the grounding brushes 4 one by one, and in each grounding brush 4, one end of the brush body 42, which is far away from the rotating shaft 1, passes through the corresponding through hole 91; the outer side surface of each friction pad 3 is respectively provided with a protrusion 32 which is in smooth transition with the outer side surface of the friction pad 3 and is used for driving the brush body 42 in each grounding brush 4 to slide out along the radial direction of the rotating shaft 1; each of the friction pads 3 and each of the protrusions 32 are made of a wear-resistant material.

In a long-term continuous operation, the friction generated between the grounding brush 4 and the friction pad 3 will cause the friction pad 3 to be damaged or fail, and it is difficult to directly observe the state of the friction pad 3 after covering the cover 9.

Therefore, in the present embodiment, the through hole 91 is provided outside the cover 9 for passing through one end of the brush body 42, when the friction pad 3 passes through the grounding brush 4, along with the rotation of the friction pad 3, the grounding brush 4 firstly slides out along the radial direction of the rotating shaft 1, and then slides out along the radial direction of the rotating shaft 1, so as to form a reciprocating motion process, and the friction between the brush body 42 and the friction pad 3 will cause the protrusion 32 to be gradually flattened, resulting in the distance that the brush body 42 slides out along the radial direction of the rotating shaft 1 to be reduced.

Further, the user can know the degree of wear of the protrusions 32 of the friction pad 3 by observing the sliding limit height of the brush body 42, thereby determining whether the friction pad 3 needs to be removed and replaced.

Further, in an embodiment, referring to fig. 1 to 6, a tip 421 for abutting against the friction pad 3 is formed at an end of the brush body 42 close to the rotating shaft 1, so as to ensure effective contact between the brush body 42 and the friction pad 3, so as to guide the current on the rotating shaft 1.

Further, in an embodiment, referring to fig. 1 to 6, the wear-resistant material is wear-resistant rubber, so as to improve the service life of the friction pad 3.

Further, in one embodiment, referring to fig. 1 to 6, the number of the friction pads 3 is two, and the number of the grounding brushes 4 is four; the predetermined angle is 90 °, and the central angle of the friction pad 3 is 100 °.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An electrical generator, comprising:

a rotating shaft;

the grounding ring is sleeved on the rotating shaft and is fixedly connected with the rotating shaft;

a plurality of friction pads; the plurality of friction pads are respectively in an arc shape, the plurality of friction pads are respectively detachably connected to the outer side surface of the grounding ring, and the plurality of friction pads are distributed around the axis of the rotating shaft at equal intervals; and

a plurality of grounding electric brushes; the grounding brushes are arranged on the outer side of the grounding ring at equal intervals around the axis of the rotating shaft;

wherein the number of the grounding brushes is twice that of the friction pads; and setting a central angle between two adjacent grounding electric brushes as a preset angle, wherein the central angles of the plurality of friction pads are respectively larger than the preset angle, and each grounding electric brush can be sequentially abutted with each friction pad when the rotating shaft rotates.

2. The generator according to claim 1, wherein the inner side surfaces of the friction pads are respectively provided with a clamping groove with an opening facing the grounding ring, the grounding ring is respectively clamped in the clamping groove of each friction pad, and the outer side surfaces of the grounding ring are respectively abutted against the bottom wall of the clamping groove of each friction pad.

3. The generator of claim 2, further comprising a plurality of first bolts and a plurality of second bolts;

the grounding ring is provided with a left end face and a right end face, the left end face is provided with a plurality of first screw holes, and the right end face is provided with a plurality of second screw holes respectively;

the first bolts, the second bolts, the first screw holes, the second screw holes and the friction pads are in one-to-one correspondence;

each first bolt penetrates through the corresponding friction pad and is in threaded connection with the corresponding first screw hole, and each second bolt penetrates through the corresponding friction pad and is in threaded connection with the corresponding second screw hole.

4. The generator of claim 1, further comprising:

the base is provided with a mounting hole for the rotating shaft to pass through; a plurality of the grounding brushes are respectively arranged on the base; and

the bearing is sleeved on the rotating shaft and arranged in the mounting hole; the bearing and the grounding ring are arranged at intervals in the axis direction of the rotating shaft.

5. The generator of claim 4 wherein each of said grounding brushes comprises a frame, a brush body and a resilient member;

the support body is installed just have the edge on the base the slip passage that the radial direction of pivot extends, the brush body slides and establishes in the slip passage, the elastic component be used for to the brush body applys the orientation the pretightning force of pivot direction.

6. The generator of claim 5, further comprising a cover covering one end of the shaft;

the base with the cover body is connected and encloses and closes and form the accommodation space, ground ring with the ground connection brush is located respectively in the accommodation space.

7. The generator of claim 6, wherein the inner wall of the cover body is respectively provided with a plurality of through holes extending along the radial direction of the rotating shaft;

in each grounding electric brush, the sliding channel is a through hole with two open ends, and the electric brush body is in a strip structure;

the through holes correspond to the grounding electric brushes one by one, and in each grounding electric brush, one end of the electric brush body, which is far away from the rotating shaft, penetrates through the corresponding through hole;

the outer side surface of each friction pad is respectively provided with a protrusion which is in smooth transition with the outer side surface of the friction pad and is used for driving the brush body in each grounding brush to slide out along the radial direction of the rotating shaft;

each friction pad and each protrusion are made of wear-resistant materials.

8. The generator of claim 7 wherein an end of the brush body proximate the shaft is formed with a tip for abutting against the friction pad.

9. The generator of claim 7 wherein the wear resistant material is a wear resistant rubber.

10. The generator of claim 1 wherein the number of friction pads is two and the number of ground brushes is four; the predetermined angle is 90 °, and the central angle of the friction pad is 100 °.