Generator main shaft grounding device
By using densely braided copper braided brush bags and carbon brushes in the generator large shaft grounding device, and using elastic parts to increase the contact pressure, the problems of small contact pressure and large resistance in the prior art are solved, and better current flow and maintenance convenience is achieved.
Patent Information
- Application Number
- CN202421321600.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-11
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-06-11
AI Technical Summary
In the existing generator large shaft grounding device, the contact pressure between the braided brush braid and the generator large shaft is small, resulting in a small contact area and an increase in resistance, which is not conducive to the transmission of current.
A generator large shaft grounding device is designed, using densely braided copper braided brush bags and carbon brushes, and pushing them into contact with the generator large shaft through elastic parts to increase the contact pressure and contact area.
By increasing the contact area, the resistance between the brush bag body and the generator's large shaft is reduced, the current flow capacity is improved, and the carbon brush and brush bag body can be replaced online, making it convenient to maintain.
Smart Images
Figure CN222654988U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of generators, in particular to a main shaft grounding device of a generator. Background Art
[0002] During the operation of the generator, the grounding carbon brushes of the generator shaft mainly play the role of eliminating the static voltage of the generator shaft to the ground. In addition, the grounding carbon brushes of the generator shaft also serve as the rotor grounding protection device and for measuring the voltage between the positive and negative poles of the rotor coil and the ground.
[0003] In the prior art, the grounding device adopts a combination of a grounding carbon brush and a braided brush braid, both of which are in contact with the main shaft of the generator at the same time. When the grounding carbon brush fails to work, the braided brush braid can still be used to offset the electrostatic voltage generated on the main shaft of the generator to ensure the safe and stable operation of the unit.
[0004] However, the braided brush braid contacts the generator shaft by virtue of its own gravity. The contact pressure between the braided brush braid and the generator shaft is relatively small, and the corresponding contact area is also relatively small, which causes the resistance at the contact point between the braided brush braid and the generator shaft to increase, which is not conducive to the transmission of current. Utility Model Content
[0005] Therefore, the technical problem to be solved by the utility model is to overcome the defect in the prior art that the braided brush braid contacts the main shaft of the generator by relying on the influence of its own gravity, and the contact pressure between the braided brush braid and the main shaft of the generator is relatively small, resulting in increased resistance at the contact point between the braided brush braid and the main shaft of the generator, which is not conducive to the transmission of current, thereby providing a grounding device for the main shaft of the generator.
[0006] In order to solve the above technical problems, the utility model provides a generator main shaft grounding device, comprising: a bracket, suitable for being installed on the generator housing;
[0007] The brush bag body is installed on the bracket. The brush bag body is used to abut against the main shaft of the generator. The brush bag body is a densely woven copper woven brush bag. Graphite powder is placed inside the brush bag body.
[0008] A first elastic member connected to the brush bag body, wherein the first elastic member has an elastic force for pushing the brush bag body to approach the main shaft of the generator;
[0009] A carbon brush body is mounted on the bracket, and the carbon brush body is used to abut against the main shaft of the generator;
[0010] A second elastic member connected to the carbon brush body, the second elastic member having an elastic force for pushing the carbon brush body close to the main shaft of the generator;
[0011] A grounding lead has one end electrically connected to the brush bag body and the carbon brush body, and the other end is grounded.
[0012] Optionally, the first elastic member is an elastic pressing plate, and the elastic pressing plate is arranged on a side of the brush bag body away from the main shaft of the generator.
[0013] Optionally, the elastic pressing sheet is mounted on the bracket via a first connecting member, and one end of the brush bag body is clamped between the elastic pressing sheet and the bracket.
[0014] Optionally, the first connecting member is a bolt, and the bolt passes through the elastic pressing sheet and the brush bag body in sequence from one side and is threadedly connected to the bracket.
[0015] Optionally, the bracket is an insulating bracket.
[0016] Optionally, the bracket has a brush groove, and the carbon brush body is installed in the brush groove.
[0017] Optionally, the second elastic member is a plug-in type constant pressure spring, one end of which is inserted into the brush groove and abuts against a side of the carbon brush body away from the main shaft of the generator.
[0018] Optionally, the bracket includes a first shell and a second shell that are detachably connected, and the brush groove is provided in the second shell.
[0019] Optionally, the second shell is mounted on the first shell via a second connecting member.
[0020] Optionally, the brush bag body is arranged at one end of the bracket, and the carbon brush body is arranged at the other end of the bracket.
[0021] The technical solution of the utility model has the following advantages:
[0022] 1. In the generator shaft grounding device provided by the utility model, the brush bag body is pushed by the first elastic member to abut against the generator shaft, and the carbon brush body is pushed by the second elastic member to abut against the generator shaft. The first elastic member can increase the contact pressure between the brush bag body and the generator shaft, thereby increasing the contact area, reducing the resistance between the brush bag body and the generator shaft, and being more conducive to the flow of current.
[0023] 2. The generator shaft grounding device provided by the utility model uses a carbon brush body and a brush bag body together. When one of them is damaged, it can be replaced online without stopping the machine, and operation and maintenance are convenient and quick.
[0024] 3. The utility model provides a generator shaft grounding device, in which the carbon brush body and the brush bag body are grounded through a grounding lead, and the grounding effect is much better than that through a fixed anchor or bolt connection, which completely solves the adverse effects of dirt and looseness of the fixed anchor or bolt on the grounding effect.
[0025] 4. The utility model provides a generator main shaft grounding device, in which the carbon brush body and the brush bag body are in contact with the surface of the generator main shaft at the same time, thereby avoiding unreliable main shaft grounding caused by failure of the carbon brush body or the brush bag body, and the carbon brush body and the brush bag body are in contact with the surface of the generator main shaft at the same time, with a large contact area, thereby ensuring the cross-sectional area required for the shaft voltage to conduct the current.
[0026] 5. The generator shaft grounding device provided by the utility model has a brush bag body that is densely woven and has graphite powder placed inside, so it has good conductivity and a better grounding effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0028] Figure 1 This is a front view of the generator main shaft grounding device provided in the first embodiment of the utility model.
[0029] Description of reference numerals:
[0030] 1. Bracket; 2. Brush bag body; 3. First elastic member; 4. Carbon brush body; 5. Second elastic member; 6. Grounding lead; 7. First connecting member; 8. Brush groove; 9. First outer shell; 10. Second outer shell; 11. Second connecting member. DETAILED DESCRIPTION
[0031] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0034] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0035] like Figure 1 As shown, a specific implementation of the generator shaft grounding device provided in this embodiment includes: a bracket 1, a brush bag body 2, a first elastic member 3, a carbon brush body 4, a second elastic member 5 and a grounding lead 6. The bracket 1 is suitable for being installed on the generator housing, the brush bag body 2 is installed on the bracket 1, the brush bag body 2 is used to abut against the generator shaft, the first elastic member 3 is connected to the brush bag body 2, the first elastic member 3 has an elastic force to push the brush bag body 2 close to the generator shaft, the carbon brush body 4 is installed on the bracket 1, the carbon brush body 4 is used to abut against the generator shaft, the second elastic member 5 is connected to the carbon brush body 4, the second elastic member 5 has an elastic force to push the carbon brush body 4 close to the generator shaft, one end of the grounding lead 6 is connected to the brush bag body 2 and the carbon brush body 4, and the other end is grounded. In this embodiment, the brush bag body 2 is a densely woven copper woven brush bag, graphite powder is placed inside it, and the conductive performance is good.
[0036] The generator shaft grounding device provided in this embodiment has a brush bag body 2 that abuts against the generator shaft under the push of the first elastic member 3, and a carbon brush body 4 that abuts against the generator shaft under the push of the second elastic member 5. The first elastic member 3 can increase the contact pressure between the brush bag body 2 and the generator shaft, thereby increasing the contact area, reducing the resistance between the brush bag body 2 and the generator shaft, and being more conducive to the flow of current.
[0037] like Figure 1 As shown, in the generator shaft grounding device provided in this embodiment, the first elastic member 3 is an elastic pressing plate, and the elastic pressing plate is arranged on the side of the brush bag body 2 away from the generator shaft. The contact area between the elastic pressing plate and the brush bag body 2 is large, and the pushing effect on the brush bag body 2 is better, so that the brush bag body 2 is in full contact with the generator shaft.
[0038] In addition, as an alternative implementation, the first elastic member 3 may also be a spring, the spring is perpendicular to the brush bag body 2, and the brush bag body 2 is pushed by the spring to contact the engine shaft.
[0039] like Figure 1 As shown, in the generator main shaft grounding device provided in this embodiment, the elastic pressing plate is installed on the bracket 1 through the first connecting member 7, and one end of the brush bag body 2 is clamped between the elastic pressing plate and the bracket 1. When the elastic pressing plate is installed, the brush bag body 2 can be fixed simultaneously, and the installation process is more convenient.
[0040] In addition, as a replaceable implementation, the elastic pressing piece and the brush bag body 2 can also be respectively installed on the bracket 1 through the first connecting member 7. When replacing, only the corresponding parts need to be disassembled, which makes maintenance more convenient.
[0041] like Figure 1 As shown, in the generator main shaft grounding device provided in this embodiment, the first connecting member 7 is a bolt, which passes through the elastic pressing plate and the brush bag body 2 in sequence from one side and is threadedly connected to the bracket 1. The bolt has a good fastening effect and a self-locking function, which effectively prevents the elastic pressing plate and the brush bag body 2 from shaking.
[0042] In addition, as an alternative embodiment, the first connecting member 7 can also be a pin, and one end of the pin is passed through the elastic pressing plate, the brush bag body 2 in sequence and inserted into the bracket 1, a channel perpendicular to the pin is set in the bracket 1, and a fixing rod is installed in the channel, so that the fixing rod is inserted into one end of the pin.
[0043] like Figure 1 As shown, in the generator main shaft grounding device provided in this embodiment, the bracket 1 is an insulating bracket, and the bracket 1 is non-conductive. It can be a wooden bracket, a plastic bracket, etc. The bracket 1 can prevent the current on the carbon brush body 4 from flowing back into the generator housing, ensuring the flow direction of the current and ensuring the grounding effect.
[0044] In addition, as an alternative implementation, a layer of rubber pad may be provided between the bracket 1 and the generator housing, and the rubber pad also plays an insulating role.
[0045] like Figure 1As shown, in the generator main shaft grounding device provided in this embodiment, the bracket 1 has a brush groove 8, and the carbon brush body 4 is installed in the brush groove 8. In this embodiment, the brush groove 8 has a directional opening, and the brush groove 8 can make the carbon brush body 4 be stably installed without shaking. In addition, the carbon brush body 4 contacts the generator main shaft under the action of its own gravity and the second elastic member 5, and the contact pressure is relatively large, and there will be no sparking phenomenon.
[0046] In addition, as an alternative implementation, a handle may be provided at one end of the carbon brush body 4 , and a thread may be provided on the handle, and the handle may be threadedly connected to the bracket 1 .
[0047] like Figure 1 As shown, in the generator main shaft grounding device provided in this embodiment, the second elastic member 5 is a plug-in type constant pressure spring, one end of the plug-in type constant pressure spring is inserted into the brush groove 8 and abuts against the side of the carbon brush body 4 away from the generator main shaft, and the plug-in type constant pressure spring is installed by plugging, with one end inserted into the brush groove 8, which makes installation and disassembly more convenient without removing the carbon brush body 4.
[0048] In addition, as an alternative implementation, the second elastic member 5 may also be a coil spring, one end of which abuts against the inner top wall of the brush groove 8 , and the other end of which abuts against the carbon brush body 4 .
[0049] like Figure 1 As shown, in the generator main shaft grounding device provided in this embodiment, the bracket 1 includes a first shell 9 and a second shell 10 that are detachably connected, and a brush groove 8 is provided in the second shell 10. The first shell 9 is used to be connected to the generator shell. When the carbon brush body 4 needs to be maintained or replaced, it is only necessary to remove the second shell 10 without removing the entire device, which is convenient for maintenance.
[0050] like Figure 1 As shown, in the generator main shaft grounding device provided in this embodiment, the second shell 10 is installed on the first shell 9 through the second connecting member 11. The second connecting member 11 can be a bolt. After passing through the second shell 10, the bolt is threadedly connected to the first shell 9. The bolt has a self-locking function and has a good fixing effect.
[0051] In addition, as an alternative embodiment, the second connecting member 11 can also be a pin, one end of the pin is passed through the second shell 10 and inserted into the first shell 9, a channel perpendicular to the pin is set in the first shell 9, a fixing rod is installed in the channel, and the fixing rod is inserted into one end of the pin.
[0052] like Figure 1As shown, in the generator main shaft grounding device provided in this embodiment, the brush bag body 2 is arranged at one end of the bracket 1, and the carbon brush body 4 is arranged at the other end of the bracket 1. The two are respectively installed on the end faces at both ends of the bracket 1. The end faces are flat, the fitting area is larger, and the installation is more stable.
[0053] The working principle of the generator main shaft grounding device provided in this embodiment is as follows:
[0054] The elastic pressure piece pushes the brush bag body 2 to contact the main shaft of the generator, and the plug-in constant pressure spring pushes the carbon brush body 4 to contact the main shaft of the generator. When the main shaft rotates at high speed, the shaft current generated by the shaft voltage flows to the grounding point through the brush bag body 2, the carbon brush body 4, and the grounding lead 6, preventing the bearing oil film from being broken down after the shaft voltage reaches a certain value, or the shaft current from being generated due to the potential difference and the formation of a path with other bearing components, which will corrode the shaft and erode the bearing.
[0055] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the present utility model.
Claims
1. A generator shaft grounding device, characterized in that: include: A bracket (1) adapted to be mounted on a generator housing; A brush bag body (2) is mounted on the bracket (1), and the brush bag body (2) is used to abut against the main shaft of the generator; A first elastic member (3) connected to the brush bag body (2), the first elastic member (3) having an elastic force for pushing the brush bag body (2) close to the main shaft of the generator; A carbon brush body (4) is mounted on the bracket (1), and the carbon brush body (4) is used to abut against the main shaft of the generator; A second elastic member (5) is connected to the carbon brush body (4), and the second elastic member (5) has an elastic force that pushes the carbon brush body (4) close to the main shaft of the generator; A grounding lead (6) has one end electrically connected to the brush bag body (2) and the carbon brush body (4), and the other end grounded.
2. The generator shaft grounding device according to claim 1, characterized in that: The first elastic member (3) is an elastic pressing plate, and the elastic pressing plate is arranged on a side of the brush bag body (2) away from the main shaft of the generator.
3. The generator shaft grounding device according to claim 2, characterized in that: The elastic pressing sheet is mounted on the bracket (1) via a first connecting piece (7), and one end of the brush bag body (2) is clamped between the elastic pressing sheet and the bracket (1).
4. The generator shaft grounding device according to claim 3, characterized in that: The first connecting member (7) is a bolt, which passes through the elastic pressing sheet and the brush bag body (2) in sequence from one side and is threadedly connected to the bracket (1).
5. The generator shaft grounding device according to claim 4, characterized in that: The bracket (1) is an insulating bracket.
6. The generator shaft grounding device according to claim 1, characterized in that: The bracket (1) has a brush groove (8), and the carbon brush body (4) is installed in the brush groove (8).
7. The generator shaft grounding device according to claim 6, characterized in that: The second elastic member (5) is a plug-in type constant pressure spring, one end of which is inserted into the brush groove (8) and abuts against a side of the carbon brush body (4) away from the main shaft of the generator.
8. The generator shaft grounding device according to claim 6, characterized in that: The bracket (1) comprises a first shell (9) and a second shell (10) which are detachably connected, and the brush groove (8) is provided in the second shell (10).
9. The generator shaft grounding device according to claim 8, characterized in that: The second housing (10) is mounted on the first housing (9) via a second connecting member (11).
10. The generator shaft grounding device according to any one of claims 1 to 9, characterized in that: The brush bag body (2) is arranged at one end of the bracket (1), and the carbon brush body (4) is arranged at the other end of the bracket (1).