CN212725901U

CN212725901U - Carbon brush assembly for grounding and grounding device

Info

Publication number: CN212725901U
Application number: CN202021591463.7U
Authority: CN
Inventors: 毛新宇; 陆燕峰; 郭安雷
Original assignee: Jiangsu Huadian Yizheng Thermoelectricity Co ltd
Current assignee: Jiangsu Huadian Yizheng Thermoelectricity Co ltd
Priority date: 2020-08-04
Filing date: 2020-08-04
Publication date: 2021-03-16
Anticipated expiration: 2030-08-04

Abstract

The utility model discloses a carbon brush subassembly for ground connection, including ground connection carbon brush and brush holder, wherein the ground connection carbon brush is the excitation carbon brush that is used for the gas turbine generator, and the ground connection carbon brush includes brush body, wire and electrically conductive grounding piece, and the brush body is connected respectively with the electrically conductive grounding piece that is used for ground connection at the both ends of wire; the brush holder is a through structure and comprises an installation part, a fixing part and a communication channel, the communication channel is positioned between the fixing part and the installation part, and the width of the communication channel is smaller than that of the fixing part; the installation part is matched with the brush body, the section length of the installation part is equal to that of the brush body, and the section width of the installation part is equal to that of the brush body. The carbon brush assembly of the utility model adopts a brand-new brush holder to match the carbon brush, has good matching performance, effectively fixes the carbon brush, and prevents the carbon brush from jumping to cause sparking; the excitation carbon brush replaced in the gas turbine generator is large in section, large in contact surface at the connection part with the large shaft and not easy to spark; in addition, a new carbon brush does not need to be purchased, and the cost is saved. The utility model also provides an earthing device, including mount, bolt and a carbon brush subassembly for ground connection, the brush holder passes through the bolt fastening is in the mount.

Description

Carbon brush assembly for grounding and grounding device

Technical Field

The utility model relates to a motor accessory technical field especially relates to a carbon brush subassembly and earthing device for ground connection.

Background

The grounding electric brush is used for eliminating shaft voltage generated by static charge at a low-pressure section of the steam turbine, and an electric brush adopted by a grounding device is additionally arranged on a generator shaft at the side of the steam turbine, and the main component of the electric brush is carbon, so the electric brush is also called a carbon brush; the grounded carbon brush is generally clamped on a brush holder, the brush holder is fixed on a motor or a generator or other rotating machinery through bolts and the like, and a spring is arranged on the brush holder to tightly press the grounded carbon brush on a rotating shaft, so that static charges on a large shaft are led into the ground through the grounded carbon brush. The existing grounding carbon brush has small section size which is usually selected to be 8mm multiplied by 20mm, the contact surface of the section and the large shaft at the joint is small, and the abrasion is easy, so that the phenomena of overhigh shaft voltage and easy sparking at the joint of the carbon brush and the large shaft are caused, the instability is high, and the grounding is unreliable; and the existing grounding carbon brush needs to be replaced after being worn, so that the maintenance cost is higher. Therefore, a carbon brush assembly for grounding is needed, and an excitation carbon brush replaced by a gas turbine generator is used, so that on one hand, the contact surface is enlarged, the vibration and the abrasion are reduced, the overhigh shaft voltage is not easy to cause, and on the other hand, the maintenance cost is saved; and the new brush holder is adopted to better fix the grounding carbon brush, so that the matching degree is good and the stability is strong.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems in the prior art, the utility model provides a carbon brush assembly for grounding, which adopts a brand-new brush holder to fix a grounding carbon brush, so that the fixation is firm, and the grounding carbon brush is prevented from jumping to strike fire; and the excitation carbon brush of the gas turbine generator is used, the contact surface of the connection part of the excitation carbon brush and the large shaft is large, sparking is not easy to occur, and the maintenance cost is saved.

The utility model provides a carbon brush subassembly for ground connection, including ground connection carbon brush and brush holder, the ground connection carbon brush is the excitation carbon brush that is used for the combustion engine generator, the ground connection carbon brush includes brush body, wire and electrically conductive grounding piece, the both ends of wire are connected respectively the brush body with electrically conductive grounding piece, electrically conductive grounding piece is used for ground connection; the brush holder is of a through structure and comprises an installation part, a fixing part and a communication channel, the communication channel is positioned between the fixing part and the installation part, and the width of the communication channel is smaller than that of the fixing part; the installation department with the brush body phase-match, the cross-sectional length of installation department equals the cross-sectional length of the brush body, the cross-sectional width of installation department equals the cross-sectional width of the brush body.

Further, the length of the cross section of the grounding carbon brush is larger than 20mm, and the width of the cross section of the grounding carbon brush is larger than 8 mm.

Preferably, the installation department is equipped with a plurality of deformation archs, the deformation arch is located on the inner wall of installation department, the deformation arch with the brush body joint.

Preferably, the carbon brush assembly for grounding further comprises an elastic fixing piece, the elastic fixing piece is fixedly arranged in the fixing portion and is clamped with the brush holder, and the elastic fixing piece is used for fixing the grounding carbon brush.

Further, the one end of elastic fixing spare is provided with spacing portion, spacing portion passes the intercommunication passageway is located in the installation department, spacing portion with elastic fixing spare's junction with intercommunication passageway's lateral wall joint, spacing portion with the one end top of the brush body is tight.

Preferably, the elastic fixing piece is a snap spring, and the limiting part is a volute spiral spring; the clamp spring comprises a V-shaped spring clamp, the volute spiral spring is positioned at the closed end of the V-shaped spring clamp, and the volute spiral spring is fixedly connected with the V-shaped spring clamp.

Further, the brush holder still has connecting portion, connecting portion with the fixed part is located the non-adjacent both sides wall of installation department is outside, be equipped with the bar groove on the lateral wall of connecting portion, the bar groove is used for with the bolt joint.

Further, the brush holder is of an integral structure.

Further, the brush holder is made of an insulating material.

The utility model also provides an earthing device, including mount, bolt and above arbitrary item energy saving and consumption reduction's a carbon brush subassembly for ground connection, the brush holder passes through the bolt fastening in the mount.

Implement the utility model discloses, following beneficial effect has:

1. the installation department be with brush body assorted structure effectively fixes the brush body, reduces the vibration of the brush body, makes ground connection more firm, improves the stability of unit operation.

2. The grounding carbon brush is an excitation carbon brush originally used for a gas turbine generator, the section size is increased, the contact surface at the joint with a large shaft is also increased, the grounding carbon brush is not easy to wear, and the phenomena of overhigh shaft voltage and easy sparking are effectively prevented; and simultaneously, the purposes of recycling and saving the maintenance cost are achieved.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly described, wherein the same components are denoted by the same reference numerals. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a schematic structural view of a grounded carbon brush in embodiment 1;

FIG. 2 is a schematic view showing a connection relationship between the brush holder and the clamp spring in embodiment 1;

FIG. 3 is a front view of a brush holder according to embodiment 1;

FIG. 4 is a top view of the brush holder;

FIG. 5 is a left side view of the brush holder;

fig. 6 is a schematic structural diagram of the snap spring.

Wherein the reference numerals in the figures correspond to: 1-grounding carbon brush, 11-brush body, 12-wire, 13-conductive grounding piece, 2-brush holder, 21-mounting part, 22-fixing part, 23-communication channel, 24-connecting part, 25-strip groove, 3-snap spring, 31-V type spring clip and 32-scroll spring.

Detailed Description

In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate the directions or positional relationships based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or structure referred to must have a specific direction, be constructed and operated in a specific direction, and thus cannot be understood as limiting the present invention; also, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Example 1:

the embodiment provides an earthing device, including mount, bolt and the carbon brush subassembly that is used for ground connection, wherein the carbon brush subassembly that is used for ground connection includes ground connection carbon brush 1 and brush holder 2, and brush holder 2 is used for fixed ground connection carbon brush 1 to brush holder 2 passes through the bolt fastening on the mount, makes whole carbon brush subassembly fixed firm, is difficult for rocking.

Specifically, referring to the attached drawing 1 of the specification, the grounding carbon brush 1 is an excitation carbon brush originally used for a combustion engine generator, and includes a brush body 11, a lead 12 and a conductive grounding sheet 13 for grounding, wherein the lead 12 is wrapped by an insulating material, two ends of the lead are respectively connected with one end of the brush body 11 and the conductive grounding sheet 13, and the other end of the brush body 11 is in contact with a large shaft, so that static charges on the large shaft are guided to the ground through the brush body 11, the lead 12 and the conductive grounding sheet 13; in the embodiment, the excitation carbon brush is worn and is not suitable for being used as the excitation carbon brush, so that the excitation carbon brush is replaced during maintenance, the section of the excitation carbon brush is large, the contact surface of the excitation carbon brush and a large shaft is large, and the excitation carbon brush can be used as the grounding carbon brush 1; compare in original carbon brush more durable, can realize the reuse of excitation carbon brush to need not to purchase new carbon brush, save the cost.

Specifically, the length a of the cross section of the brush body 11 is greater than 20mm, the width b of the cross section is greater than 8mm, the contact surface between the brush body and the large shaft is increased, vibration is reduced, stability is enhanced, and grounding reliability is improved.

Specifically, as shown in fig. 3 to 5, in order to fix the ground carbon brush 1 having a larger cross section, a new brush holder 2 is used, the whole brush holder 2 has a through structure, and includes a mounting portion 21 for placing the ground carbon brush 1, a sectional length c of the mounting portion 21 is equal to a sectional length a of the brush body 11, and a sectional width d of the mounting portion 21 is equal to a sectional width b of the brush body 11, so as to effectively fix the brush body 11.

Preferably, set up a plurality of deformation archs on the inner wall of installation department 21, when brush body 11 installs into installation department 21, but deformation arch and brush body 11's outer wall joint to further fixed ground connection carbon brush 1 prevents to rock.

Specifically, the brush holder 2 further comprises a fixing portion 22 and a communicating channel 23, the fixing portion 22 is located outside one side wall of the mounting portion 21, the communicating channel 23 is arranged on the side edge of the fixing portion 22, which is in contact with the mounting portion 21, and the communicating channel 23 communicates the hollow cavity of the mounting portion 21 with the hollow cavity of the fixing portion 22; as shown in the plan view of fig. 4, the width e of the communication passage 23 is smaller than the width f of the fixing portion 22 so that the hollow cavity of the fixing portion 22 partially communicates with the hollow cavity of the mounting portion 21.

Specifically, the utility model discloses a carbon brush subassembly for ground connection includes elastic fixing spare, and elastic fixing spare sets up in fixed part 22 to its one end is provided with the spacing portion that is used for fixed ground connection carbon brush 1, and this spacing portion is located installation department 21, and the one end and the 21 lateral wall joints of installation department of spacing portion, the other end is tight in top with the one end of brush body 11, prevents ground connection carbon brush 1 from the one end roll-off of installation department 21.

Preferably, in an embodiment of the present invention, as shown in fig. 2 and 6, the elastic fixing member is a snap spring 3, the limiting portion is a spiral spring 32, the snap spring 3 is composed of a V-shaped spring clip 31 and a spiral spring 32, and one end of the spiral spring 32 is fixed to a closed end of the V-shaped spring clip 31 by welding or riveting.

Specifically, as shown in fig. 3 to 5, the brush holder 2 further has a connecting portion 24, the connecting portion 24 and the fixing portion 22 are respectively located outside two non-adjacent side walls of the mounting portion 21, the connecting portion 24 has a side wall which does not intersect with the mounting portion 21, the side wall is provided with a strip-shaped groove 25, and when the brush holder 2 is fixed to the fixing frame, a bolt passes through the strip-shaped groove 25 to screw the brush holder 2 to the fixing frame; also, the bolt is preferably an insulating bolt.

Specifically, in the present embodiment, the brush holder 2 is integrally formed of brass, which is an insulating material.

When the fixing device is installed, the V-shaped spring clamp 31 is held, one end with the spiral spring 32 is inserted into the fixing portion 22, the spiral spring 32 can pass through the communication channel 23 and is positioned in the mounting portion 21 because the communication channel 23 is positioned between the mounting portion 21 and the fixing portion 22, and at this time, because the width e of the communication channel 23 is smaller than the width f of the fixing portion 22, as shown in fig. 2, the V-shaped spring clamp 31 can be tightly pressed against two inner walls of the fixing portion 22 and cannot be bounced into the mounting portion 21 under the action of elastic force so as to lose the fixing effect; after the installation of jump ring 3 is accomplished, insert installation department 21 with the one end of brush body 11, when brush body 11 contact volute spiral spring 32, volute spiral spring 32 bears bending moment, produces crooked elastic deformation, makes both tight each other tops, and 1 roll-off installation departments 21 of ground connection carbon brush when preventing equipment vibration use the bolt again to pass strip-shaped groove 25, on 2 fixed mounts with brush holders, make the other end of brush body 11 and the apical tension of macroaxis contact, accomplish ground connection.

According to the present embodiment, the present invention has the following advantages:

1. the installation department for with brush body assorted structure, effectively fixed brush body reduces the vibration of brush body, the one end of the tight brush body in spiral spring top, further fixed brush body prevents that the brush body from deviating from, makes ground connection more firm, improves the stability of unit operation.

2. The excitation carbon brush has the advantages of large cross section, slow abrasion, long service life, increased contact surface at the joint of the excitation carbon brush and the large shaft, difficult shaft voltage overhigh or sparking phenomenon and good stability.

3. The replaced excitation carbon brush is used, so that the reuse is realized, a new grounding carbon brush does not need to be purchased, and the overhaul cost is greatly saved.

While only certain embodiments of the present invention have been described and illustrated herein, it will be understood by those skilled in the art that various changes and modifications may be made, and any such modifications, equivalents and improvements are within the scope of the invention as claimed.

Claims

1. The carbon brush assembly for grounding is characterized by comprising a grounding carbon brush (1) and a brush holder (2), wherein the grounding carbon brush (1) is an excitation carbon brush for a combustion engine generator, the grounding carbon brush (1) comprises a brush body (11), a lead (12) and a conductive grounding sheet (13), two ends of the lead (12) are respectively connected with the brush body (11) and the conductive grounding sheet (13), and the conductive grounding sheet (13) is used for grounding; the brush holder (2) is of a through structure, the brush holder (2) comprises an installation part (21), a fixing part (22) and a communication channel (23), the communication channel (23) is located between the fixing part (22) and the installation part (21), and the width of the communication channel (23) is smaller than that of the fixing part (22); installation department (21) with the brush body (11) phase-match, the section length of installation department (21) equals the section length of the brush body (11), the section width of installation department (21) equals the section width of the brush body (11).

2. The carbon brush assembly for grounding of claim 1, wherein a sectional length of the grounding carbon brush (1) is greater than 20mm, and a sectional width of the grounding carbon brush (1) is greater than 8 mm.

3. The carbon brush assembly for grounding as claimed in claim 2, wherein the mounting portion (21) is provided with a plurality of deformable protrusions, the deformable protrusions are located on an inner wall of the mounting portion (21), and the deformable protrusions are engaged with the brush body (11).

4. The carbon brush assembly for grounding of claim 2, further comprising an elastic fixing member, wherein the elastic fixing member is fixedly disposed in the fixing portion (22), and is further clamped with the brush holder (2), and the elastic fixing member is used for fixing the grounding carbon brush (1).

5. The carbon brush assembly for grounding according to claim 4, wherein a limiting portion is disposed at one end of the elastic fixing member, the limiting portion penetrates through the communication channel (23) and is located in the mounting portion (21), a joint of the limiting portion and the elastic fixing member is clamped with a side wall of the communication channel (23), and the limiting portion is tightly abutted against one end of the brush body (11).

6. The carbon brush assembly for grounding as claimed in claim 5, wherein the elastic fixing member is a snap spring (3), and the limiting portion is a spiral spring (32); the clamp spring (3) comprises a V-shaped spring clamp (31), the volute spiral spring (32) is located at the closed end of the V-shaped spring clamp (31), and the volute spiral spring (32) is fixedly connected with the V-shaped spring clamp (31).

7. The carbon brush assembly for grounding according to claim 1, wherein the brush holder (2) further has a connecting portion (24), the connecting portion (24) and the fixing portion (22) are located outside two non-adjacent side walls of the mounting portion (21), a strip-shaped groove (25) is formed in a side wall of the connecting portion (24), and the strip-shaped groove (25) is used for being clamped with a bolt.

8. A carbon brush assembly for grounding according to claim 1, wherein the brush holder (2) is of a unitary structure.

9. A carbon brush assembly for grounding according to claim 1, wherein the brush holder (2) is made of an insulating material.

10. An earthing device, characterized by comprising a fixing frame, a bolt, and the carbon brush assembly for earthing according to any one of claims 1 to 9, the brush holder (2) being fixed to the fixing frame by the bolt.