CN218006077U - Grounding device for large shaft of generator - Google Patents

Abstract

The utility model provides a generator main shaft earthing device, is including weaving the brush pigtail, weave brush pigtail one end through fixed subassembly fix on the main shaft dustcoat, the other end under pressure assembly's pressure with the main shaft contact, pressure assembly includes pressure spare, one side that pressure spare is close to weaving the brush pigtail is provided with the elasticity preforming, be provided with on the pressure spare and press the elasticity spare of weaving the brush pigtail with the elasticity preforming. This embodiment improves on weaving brush pigtail and generator macroaxis contact type earthing device's basis, increases pressure assembly, and pressure spare provides the support, and the elastic component provides pressure for the elasticity preforming and will weave the brush pigtail and support, press on the generator macroaxis, has guaranteed that the pressure of brush pigtail and macroaxis contact is stable, has guaranteed its contact resistance's stability, can prevent simultaneously that the brush pigtail from beating and strike sparks.

Description

Generator main shaft grounding device

Technical Field

The utility model relates to an electric power tech field particularly, relates to a generator main shaft earthing device.

Background

The grounding device for the large shaft of the generator in the prior art mainly comprises two types, wherein one type is a carbon brush grounding mode, and the other type is a grounding device in which a braided brush braid is contacted with the large shaft of the generator.

1. The common generator large shaft grounding device adopts a carbon brush grounding mode, i.e. static charges on the large shaft are led to the ground through the carbon brush, so that the static voltage of the large shaft to the ground is eliminated. The main problems are as follows:

1) Due to the influence of factors such as high-speed rotation of the rotating shaft, oil pollution outside the rotating shaft and the like, the phenomena that the surface of the rotating shaft is not smooth and the carbon brush jumps on the surface of the rotating shaft can occur on a large shaft of the generator.

2) Under the influence of the shaft voltage of the large shaft of the generator, the grounding carbon brush may have a sparking phenomenon. The large shaft of the generator is oxidized and intensified by jumping and striking, the surface of the large shaft has a light melting point, and the surface wound of the large shaft is caused. Meanwhile, the measurement of one-point grounding protection of the generator rotor is inaccurate, and even the generator mistakenly generates one-point grounding protection signal of the generator rotating shaft.

3) The safe and stable operation of the hydrogen-cooled generator unit is also greatly threatened by the ignition of the grounding carbon brush, the explosion limit range of hydrogen is wide, and the hydrogen explosion risk exists.

4) The carbon brush is too short, so that the pressure spring of the carbon brush is extended and the pressure is reduced, and the carbon brush is not tightly contacted with the slip ring.

5) The pressure of a voltage-sharing spring of the carbon brush is small, the contact pressure of the carbon brush and the slip ring is small, and the contact resistance is increased.

6) The vibration of the bearing bush of the generator is large, so that the slip ring and the carbon brush are in poor contact.

7) The slip ring is out of round, so that the slip ring and the carbon brush are in poor contact and have large contact resistance.

8) The contact surface of the slip ring and the carbon brush is dirty, so that the slip ring and the carbon brush are in poor contact.

9) The carbon brush is unreasonable in design or is broken, so that the contact area of the carbon brush and the slip ring is too small, and the contact resistance is too large.

2. The braided brush braid is contacted with a large shaft of the generator. Namely, a graphite carbon brush is not used, a weaving braid is arranged between the part fixedly connected with the generator and the part used for fixing the brush holder of the carbon brush, and the weaving braid is contacted with a large shaft of the generator. The contact surface of the weaving braid and the generator large shaft is about 200mm multiplied by 40mm, the stable contact with the generator large shaft is ensured by the influence of self gravity, and the static voltage of the generator large shaft is released by the weaving braid.

1) In the mode, the self gravity of the brush braid is only utilized to be in contact with the large shaft of the generator, the contact pressure is small, the contact resistance is increased in the operation process, and the shaft voltage is increased.

2) The copper braided brush braid end part adopts the copper sheet crimping form, and the copper sheet probably appears beating the phenomenon of striking sparks when the generator main shaft is high-speed to be operated.

In view of this, the present application is specifically made.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a generator main shaft earthing device, it has increased pressure assembly, will weave the brush pigtail and press in the main shaft, guarantees to weave the pressure stability of brush pigtail and main shaft contact, prevents to weave the brush pigtail and beats the ignition and cause the accident.

The embodiment of the utility model is realized like this:

first aspect, the utility model provides a generator main shaft earthing device, including weaving the brush pigtail, weave brush pigtail one end through fixed subassembly fix on the main shaft dustcoat, the other end under pressure assembly's pressure with the main shaft contact, pressure assembly includes the pressure piece, one side that the pressure piece is close to weaving the brush pigtail is provided with the elasticity preforming, is provided with on the pressure piece and presses the elasticity preforming to the elastic component of weaving the brush pigtail.

In an alternative embodiment, the elastic member is a compression spring, and one end of the compression spring is fixed on the pressure member, and the other end of the compression spring is fixed on or abuts against the elastic pressing sheet.

In an alternative embodiment, the resilient sheeting is a stainless steel resilient sheeting.

In an alternative embodiment, the pressure member is a hard metal plate, the hard metal plate sequentially comprises a fixing section, an arc-shaped section and a pressure applying section, the fixing section is fixed on the fixing assembly, and the elastic member is fixed on the pressure applying section.

In an alternative embodiment, the end of the braided braid that contacts the large shaft is a fan-out burr-like structure.

In an alternative embodiment, the braided braid is a copper braided braid.

In an alternative embodiment, the fixing assembly comprises a fixing base, and a first mounting hole which is used for conveniently mounting the fixing base on the large shaft housing is formed in the fixing base.

In an alternative embodiment, a second mounting hole is formed in the fixing base, and a fixing screw penetrates through the pressure piece and the elastic pressing piece in sequence to be fixed on the second mounting hole.

In an alternative embodiment, the fixing base includes a first mounting plane and a second mounting plane, the first mounting hole being located on the first mounting plane and the second mounting hole being located on the second mounting plane.

In an alternative embodiment, the area of contact of the braided braid with the large shaft is 200mm by 40mm.

The embodiment of the utility model provides a beneficial effect is:

improve on weaving brush pigtail and generator main shaft contact type earthing device's basis, increase pressure assembly, the pressure member provides the support, and the elastic component provides pressure for the elasticity preforming and will weave the brush pigtail and support, press on the generator main shaft, has guaranteed that the pressure of brush pigtail and main shaft contact is stable, has guaranteed its contact resistance's stability, can prevent that the brush pigtail from beating simultaneously and strike sparks.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of the present invention.

1-weaving a braid; 2-a pressure member; 3-elastic tabletting; 4-an elastic member; 5-scattering the burr-like structure; 6-fixing the base; 7-a first mounting hole; 8-fixing screws; 9-arc section; 10-pressure application section.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

First embodiment

Referring to fig. 1, the present embodiment provides a generator large shaft grounding device, which includes a braided braid 1, one end of the braided braid 1 is fixed on a large shaft housing through a fixing component, and the other end of the braided braid is in contact with a large shaft under the pressure of a pressure component, the pressure component includes a pressure member 2, an elastic pressing sheet 3 is disposed on one side of the pressure member 2 close to the braided braid 1, and an elastic member 4 for pressing the elastic pressing sheet 3 to the braided braid 1 is disposed on the pressure member 2.

When the grounding device for the large shaft of the generator in the embodiment is used, the weaving brush braid 1 is fixed on the outer cover of the large shaft through the fixing component, and the weaving press braid is abutted to and pressed on the large shaft of the generator through the pressure component, so that the grounding of the large shaft of the generator is realized.

Specifically, the pressure assembly in this embodiment includes a pressure member 2 for providing a supporting force and a pressure force, and the pressure member 2 has a certain hardness and is not deformed or is less deformed by the pressure force within a certain range.

Elastic pressing sheet 3 in this embodiment is used for bearing the pressure of elastic component 4 to on will weaving the pressure braid, will weave the pressure braid and support, press on the generator macroaxis, elastic pressing sheet 3 has certain elasticity in certain extent, can take place deformation when receiving elastic component 4's power, thereby press the braid to weaving and produce pressure.

The elastic member 4 in this embodiment can be selected according to actual needs as long as it can cooperate with the pressure member 2 to give sufficient pressure to the elastic pressing sheet 3.

Improve on weaving brush pigtail 1 and generator macroaxis contact type earthing device's basis, increase pressure assembly, pressure member 2 provides the support, and elastic component 4 provides pressure for elastic pressing piece 3 and will weave brush pigtail 1 to, press on the generator macroaxis, has guaranteed that the pressure of brush pigtail and macroaxis contact is stable, has guaranteed its contact resistance's stability, can prevent simultaneously that the brush pigtail from beating the striking sparks.

In this embodiment, the elastic member 4 is a compression spring, one end of the compression spring is fixed on the pressure member 2, and the other end of the compression spring is fixed or pressed against the elastic pressing sheet 3.

The elastic part 4 in this embodiment is a compression spring, and the specification of the compression spring can be selected according to actual conditions, so that the selection range is wide, and the adaptability is high. Further, the elastic member 4 may be a screw with a spring, i.e. the screw is fixed on the pressure member 2, and one end of the spring is sleeved on the screw rod of the screw, and the spring is compressed between the pressure member 2 and the elastic pressing plate 3, so that the spring is not separated from the screw rod.

Specifically, the elastic member 4 in the present embodiment may have another structure, but is preferably made of stainless steel in consideration of the life of the present apparatus.

The stainless steel elastic sheet on the weaving brush braid 1 is stressed through the spring, so that the weaving brush braid 1 is always tightly attached to the large shaft of the generator, the metal brush braid is abraded very little in long-term operation, the spring pressure can be kept stable, the weaving brush braid 1 can be kept with the large shaft of the generator in a good and stable contact resistance value, and meanwhile, the maintenance amount of equipment is greatly reduced.

In this embodiment, the elastic sheet 3 is a stainless steel elastic sheet.

Likewise, the elastic pressing sheet 3 in this embodiment is preferably a stainless steel elastic sheet having resistance to weak corrosive media such as air, steam, water, etc., and the stainless steel elastic sheet contributes to prolonging the service life of the device and reducing the replacement and maintenance costs.

In this embodiment, the pressure member 2 is a hard metal plate, the hard metal plate sequentially includes a fixing section, an arc-shaped section 9 and a pressure applying section 10, the fixing section is fixed on the fixing component, and the elastic member 4 is fixed on the pressure applying section 10.

2 one end of pressure member in this embodiment is fixed on fixed subassembly, plays the effect of supporting pressure member 2, and the other end is fixed with elastic component 4, plays the supporting role to elastic component 4, and the centre is provided with segmental arc 9, adjusts the spring through the crooked radian of proper amount and compresses tightly the dynamics.

It should be noted that, in the present embodiment, the hard metal plate has a small deformability, and the reaction force of the elastic member 4 is relatively small, so that the reaction force of the elastic member 4 hardly deforms or deforms very little, and hardly influences the pressure between the braid 1 and the large shaft; when the bending radian of the arc-shaped section 9 needs to be adjusted, the hard metal plate only needs to be deformed by using a large force.

The structures of the fixing section and the pressing section 10 in this embodiment may be selected according to the needs, and may be arc-shaped or flat-shaped.

In this embodiment, the end of the braided brush braid 1 in contact with the major axis is a fan-out burr-like structure 5.

The burr column structure 5 that scatters makes things convenient for alright in order to increase the area of contact between brush plait 1 and the generator main shaft, and the terminal burr form sectional area of on the other hand is less, can stretch into the unevenness department on generator main shaft surface, can with the generator main shaft between effective contact to ensure to weave brush plait 1 and generator main shaft constantly effective contact.

In this embodiment, the braided brush braid 1 is a braided brush braid 1 made of a copper material.

The copper has high conductivity, can efficiently lead out the static current on the large shaft of the generator, avoids the damage of the static current on the large shaft of the generator, has relatively low price, and can reduce the manufacturing cost of the braided brush braid 1.

In this embodiment, the fixing component includes a fixing base 6, and a first mounting hole 7 is provided on the fixing base 6 to facilitate mounting the fixing base 6 on the large-axis housing.

A part such as a screw can be used to pass through the first mounting hole 7, so that the fixing base 6 is fixed on the outer cover of the large shaft of the generator, and the device is fixed.

In this embodiment, the fixing base 6 is provided with a second mounting hole, and a fixing screw 8 sequentially penetrates through the pressure piece 2 and the elastic pressing piece 3 to be fixed on the second mounting hole.

Adopt screw fixation pressure piece 2 and elasticity preforming 3, easy to assemble dismantles.

In this embodiment, the fixing base 6 includes a first mounting plane on which the first mounting hole 7 is located and a second mounting plane on which the second mounting hole is located.

The first mounting hole 7 and the second mounting hole in the embodiment are respectively located on two planes, so that the installation and the disassembly are convenient.

In this embodiment, the contact area between the braided braid 1 and the large shaft is 200mm × 40mm, so that the electrostatic voltage in the operation process of the large shaft of the generator can be released.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a generator main shaft earthing device, its characterized in that, is including weaving the brush pigtail, weave brush pigtail one end through fixed subassembly fix on the main shaft dustcoat, the other end under pressure assembly's pressure with the main shaft contact, pressure assembly includes the pressure piece, one side that the pressure piece is close to weaving the brush pigtail is provided with the elasticity preforming, be provided with on the pressure piece and press the elasticity piece of weaving the brush pigtail to the elasticity preforming.

2. The generator main shaft grounding device according to claim 1, wherein the elastic member is a compression spring, one end of the compression spring is fixed on the pressure member, and the other end of the compression spring is fixed on or abuts against the elastic pressure piece.

3. The generator large shaft grounding device as claimed in claim 1, wherein the elastic pressing sheet is a stainless steel elastic sheet.

4. The generator main shaft grounding device according to claim 1, wherein the pressure member is a hard metal plate, the hard metal plate sequentially comprises a fixing section, an arc-shaped section and a pressure applying section, the fixing section is fixed on the fixing component, and the elastic member is fixed on the pressure applying section.

5. The generator main shaft grounding device of claim 1, wherein the end of the braided braid in contact with the main shaft is a fanned out burr-like structure.

6. The generator main shaft grounding device according to claim 1, wherein the braided braid is a braided braid made of copper material.

7. The generator main shaft grounding device according to claim 1, wherein the fixing assembly comprises a fixing base, and the fixing base is provided with a first mounting hole for facilitating mounting of the fixing base on the main shaft housing.

8. The generator main shaft grounding device as claimed in claim 7, wherein a second mounting hole is formed on the fixing base, and a fixing screw is sequentially inserted through the pressure member and the elastic pressing piece to be fixed on the second mounting hole.

9. The generator large shaft grounding device of claim 8, wherein the fixing base comprises a first mounting plane and a second mounting plane, the first mounting hole is located on the first mounting plane, and the second mounting hole is located on the second mounting plane.

10. The generator large shaft grounding device according to claim 1, wherein the contact area of the braided braid and the large shaft is 200mm x 40mm.

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