Generator rotor shaft voltage detection device

Abstract

The embodiment of the invention provides a generator rotor shaft voltage detection device. The generator rotor shaft voltage detection device comprises a carbon brush, a carbon brush seat and a grip, the carbon brush is cylindrical, the carbon brush and the carbon brush seat are pivotally connected around the central axis of the carbon brush, and the carbon brush seat is connected with the grip and used for being electrically connected with a multimeter. According to the generator rotor shaft voltage detection device provided by the embodiment of the invention, the carbon brush is pivotally arranged on the carbon brush seat, and the carbon brush seat is connected with the grip. The carbon brush abuts against the generator large shaft by holding and moving the grip, when the generator large shaft rotates, the carbon brush pivots relative to the carbon brush base under the friction force effect of the generator large shaft, the generator large shaft makes rolling contact with the carbon brush, and therefore it is ensured that the carbon brush makes contact with the generator large shaft stably; and meanwhile, a measurer can directly judge the contact state according to the rolling condition of the carbon brush and make force adjustment, so that the data jump condition is reduced, and the stability of the output waveform is ensured.

Description

Technical Field

[0001] The present invention relates to the field of detection devices, and more particularly to a device for detecting the shaft voltage of a generator rotor. Background Art

[0002] During the operation of a generator, due to the unbalanced alternating magnetic field inside the generator, a voltage may be generated on the generator shaft. When the shaft voltage is sufficient to break down the oil film between the shaft and the bearing, a discharge phenomenon will occur, deteriorating the oil quality for lubrication and cooling. In severe cases, it may cause the bearing bush to burn out, resulting in an accident. Therefore, it is very necessary to check and measure the voltage between the shaft and the bearing of the generator set.

[0003] Currently, the tools used to detect the shaft voltage of a generator rotor are all simply made by workers according to the detection environment. Usually, a carbon brush is tied to one end of a wooden stick, and then the carbon brush is connected to a multimeter. When in use, the wooden stick is held and moved to make the carbon brush contact the generator rotor. However, during the use process, there is a situation where the data is unstable due to unstable force. Since the rated speed of the rotor is relatively high, if the holding angle of the person holding the wooden stick is not good and the force is uneven due to long-term testing, it will cause a large deviation in the waveform, and even a situation where the top of the carbon brush catches fire, causing great interference to the detection result. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to some extent.

[0005] To this end, an embodiment of the present invention provides a device for detecting the shaft voltage of a generator rotor.

[0006] The device for detecting the shaft voltage of a generator rotor according to an embodiment of the present invention includes:

[0007] A carbon brush, a carbon brush holder, and a grip. The carbon brush is cylindrical, and the carbon brush is pivotally connected to the carbon brush holder around the central axis of the carbon brush. The carbon brush holder is connected to the grip and is used for electrical connection with a multimeter.

[0008] In the device for detecting the shaft voltage of a generator rotor according to an embodiment of the present invention, the carbon brush is pivotally arranged in the carbon brush holder, and the carbon brush holder is connected to the grip. By holding and moving the grip to make the carbon brush abut against the generator shaft, when the generator shaft rotates, the carbon brush pivots relative to the carbon brush holder under the frictional force of the generator shaft, and makes the generator shaft and the carbon brush in rolling contact, thereby ensuring stable contact between the carbon brush and the generator shaft. At the same time, the measurement personnel can directly judge the contact state through the rolling situation of the carbon brush and make force adjustment to reduce data jump, so as to ensure the stability of the output waveform.

[0009] In some embodiments, the carbon brush holder is detachably connected to the grip.

[0010] In some embodiments, the generator rotor shaft voltage detection device further includes a carbon brush shaft, and the carbon brush is sleeved on the outer periphery of the carbon brush shaft;

[0011] The carbon brush holder includes a base, a first bracket and a second bracket. The base is detachably connected to the handle. The first bracket and the second bracket are arranged on the base and spaced apart. The carbon brush shaft is located between the first bracket and the second bracket. The first end of the carbon brush shaft is pivotally connected to the first bracket, and the second end of the carbon brush shaft is pivotally connected to the second bracket.

[0012] In some embodiments, the base is provided with a boss, and one end of the handle is provided with a groove, and the boss is detachably fitted in the groove.

[0013] In some embodiments, the boss is provided with an external thread, and the groove is provided with an internal thread, and the internal thread is adapted to the external thread.

[0014] In some embodiments, the boss is connected to the measurement lead connecting the multimeter, and the handle is provided with a perforation communicating with the groove, and the perforation is used for threading the measurement lead.

[0015] In some embodiments, the handle includes a rod body and an insulating handle, and the rod body is provided with the groove and the perforation.

[0016] In some embodiments, the rod body is arranged to be telescopic along the central line direction of the rod body.

[0017] In some embodiments, the rod body includes at least two nested sleeves. Along the direction of sequential nesting, each adjacent two of the sleeves can slide relative to each other along the central line direction of the rod body. The inner cavity of the innermost sleeve forms the groove, the outermost sleeve is connected to the insulating handle, and one of the at least two sleeves is provided with the perforation.

[0018] In some embodiments, the carbon brush is made of graphite, and the carbon brush holder and the carbon brush shaft are made of metal. Description of the Drawings

[0019] Figure 1 is a schematic diagram of the generator rotor shaft voltage detection device according to an embodiment of the present invention.

[0020] Reference Numerals:

[0021] 1. Carbon brush; 2. Carbon brush holder; 21. Base; 211. Boss; 22. First bracket; 23. Second bracket; 3. Handle; 31. Groove; 32. Perforation; 33. Rod body; 34. Insulating handle; 4. Carbon brush shaft; 5. Measurement lead. Detailed Embodiments

[0022] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0023] Below, reference is made to Figure 1 describe a generator rotor shaft voltage detection device according to an embodiment of the present invention.

[0024] As Figure 1 shown, the generator rotor shaft voltage detection device according to an embodiment of the present invention includes a carbon brush 1, a carbon brush holder 2, and a grip 3.

[0025] The carbon brush 1 is arranged in a cylindrical shape. For example, as Figure 1 shown, the carbon brush 1 is in a cylindrical shape with its central axis extending in the front-rear direction.

[0026] The carbon brush 1 is pivotally connected to the carbon brush holder 2 about the central axis of the carbon brush 1. For example, as Figure 1 shown, the carbon brush 1 is pivotally connected to the carbon brush holder 2 about the front-rear direction.

[0027] The carbon brush holder 2 is connected to the grip 3 and is used for electrical connection with a multimeter.

[0028] For the generator rotor shaft voltage detection device according to an embodiment of the present invention, the carbon brush is pivotally arranged in the carbon brush holder, and the carbon brush holder is connected to the grip. By holding and moving the grip to make the carbon brush abut against the generator shaft, when the generator shaft rotates, the carbon brush pivots relative to the carbon brush holder under the frictional force of the generator shaft, and the generator shaft and the carbon brush are in rolling contact, thereby ensuring stable contact between the carbon brush and the generator shaft. At the same time, the measurement personnel can directly judge the contact state through the rolling condition of the carbon brush and make force adjustment to reduce data jump, so as to ensure the stability of the output waveform.

[0029] In some embodiments, the carbon brush holder 2 is detachably connected to the grip 3.

[0030] As Figure 1 shown, the left end of the carbon brush holder 2 is detachably connected to the grip 3 to disassemble the carbon brush holder 2, so as to facilitate the replacement of the worn carbon brush 1.

[0031] In some embodiments, the generator rotor shaft voltage detection device according to an embodiment of the present invention further includes a carbon brush shaft 4, and the carbon brush 1 is sleeved on the outer periphery of the carbon brush shaft 4.

[0032] The carbon brush holder 2 includes a base 21, a first bracket 22 and a second bracket 23. The base 21 is detachably connected to the grip 3. The first bracket 22 and the second bracket 23 are arranged on the base 21 and spaced apart. The carbon brush shaft 4 is located between the first bracket 22 and the second bracket 23. The first end of the carbon brush shaft 4 is pivotally connected to the first bracket 22, and the second end of the carbon brush shaft 4 is pivotally connected to the second bracket 23.

[0033] As Figure 1 shown, the base 21 is preferably but not limited to a plate body extending in the front-rear direction and vertically arranged, and is detachably connected to the left end of the grip 3. The first bracket 22 and the second bracket 23 are preferably but not limited to plate bodies extending in the left-right direction and vertically arranged. The first bracket 22 is arranged at the front end of the base 21, the second bracket 23 is arranged at the rear end of the base 21, and both the first bracket 22 and the second bracket 23 extend leftward from the base 21.

[0034] The carbon brush shaft 4 extends in the front-rear direction. The cross-section of the carbon brush 1 is circular ring-shaped and is sleeved on the outer periphery of the carbon brush shaft 4. The front end of the carbon brush shaft 4 is pivotally connected to the first bracket 22 around the front-rear direction, and the rear end of the carbon brush shaft 4 is pivotally connected to the second bracket 23 around the front-rear direction, so that the carbon brush shaft 4 can pivot around its own central axis, and thus the carbon brush 1 can pivot relative to the carbon brush holder 2 around the front-rear direction.

[0035] There is a spaced space between the carbon brush shaft 4 and the base 21 which is greater than the thickness of the carbon brush 1 to prevent wear between the carbon brush 1 and the base 21.

[0036] The base 21, the first bracket 22 and the second bracket 23 can ensure the installation stability of the carbon brush shaft 4, so as to ensure the installation stability of the carbon brush 1, thereby ensuring stable contact between the carbon brush 1 and the large shaft of the generator, and enabling the carbon brush 1 to pivot around the front-rear direction through the carbon brush shaft 4, so that the large shaft of the generator and the carbon brush are in rolling contact.

[0037] Preferably, when the remaining thickness of the worn carbon brush 1 is less than or equal to 1 / 3 of the initial thickness, the carbon brush 1 needs to be replaced.

[0038] It can be understood that the generator rotor shaft voltage detection device is not limited to having a carbon brush shaft. In some other embodiments, a convex shaft can also be provided at the left ends of the first bracket and the second bracket, and shaft holes are provided on the front end face and the rear end face of the carbon brush. The convex shaft is fitted in the corresponding shaft hole and can pivot relative to the shaft hole, so that the carbon brush and the carbon brush holder are pivotally connected.

[0039] In some embodiments, the base 21 is provided with a boss 211, and one end of the grip 3 is provided with a groove 31. The boss 211 is detachably fitted in the groove 31.

[0040] As Figure 1As shown, the base 21 is provided with a boss 211 protruding rightward, and the left end face of the handle 3 is provided with a groove 31. The boss 211 is detachably fitted in the groove 31, such as being connected by insertion, threaded connection, etc. Thus, the base 21 and the handle 3 are detachably connected, and the stability during connection is ensured.

[0041] Preferably, the distance between the boss 211 and the first bracket 22 is equal to the distance between the boss 211 and the second bracket 23.

[0042] In some embodiments, the boss 211 is provided with an external thread, and the groove 31 is provided with an internal thread, and the internal thread is adapted to the external thread.

[0043] As Figure 1 shown, the boss 211 is a cylinder extending in the left-right direction, the groove 31 is a round hole, the outer peripheral surface of the boss 211 is provided with an external thread spirally arranged in the left-right direction, and the inner peripheral surface of the groove 31 is provided with an internal thread spirally arranged in the left-right direction. The internal thread is adapted to the external thread so that the boss 211 and the groove 31 are threadedly connected, thereby enabling the base 21 and the handle 3 to be threadedly connected, so as to have good connection stability when connected.

[0044] In some embodiments, the boss 211 is connected to the measurement lead 5 connecting the multimeter, and the handle 3 is provided with a perforation 32 communicating with the groove 31, and the perforation 32 is used for threading the measurement lead 5.

[0045] As Figure 1 shown, the carbon brush 1 is made of graphite, the carbon brush holder 2 and the carbon brush shaft 4 are made of metal, the right end of the boss 211 is connected to the measurement lead 5, and the handle 3 is provided with a perforation 32 communicating with the groove 31 at the middle position in the left-right direction. When the base 21 and the handle 3 are connected, the measurement lead 5 extends from the perforation 32 to the outside of the handle 3 and is connected to the multimeter, and the detection data is obtained and observed through the multimeter.

[0046] In some embodiments, the handle 3 includes a rod body 33 and an insulating handle 34, and the rod body 33 is provided with the groove 31 and the perforation 32.

[0047] As Figure 1 shown, the handle 3 includes a rod body 33 and an insulating handle 34. The rod body 33 extends in the left-right direction. The left end face of the rod body 33 is provided with the groove 31, the middle of the rod body 33 is provided with the perforation 32, and the right end of the rod body 33 is connected to the insulating handle 34. The rod body 33 is preferably but not limited to being made of epoxy resin.

[0048] When the generator rotor shaft voltage detection device is in use, the operator holds the insulating handle 34 for easy contact.

[0049] In some embodiments, the rod body 33 is arranged to be telescopic along the central line direction of the rod body 33. For example, the rod body 33 is arranged to be as Figure 1The left - right direction shown is telescopic, so that the distance between the insulating handle 34 and the carbon brush 1 can be adjusted by adjusting the length of the telescopic rod body 33, ensuring that the carbon brush 1 can abut against the large shaft of the generator.

[0050] In some embodiments, the rod body 33 includes at least two nested sleeves arranged in sequence. Along the direction of sequential nesting, every two adjacent sleeves can slide relative to each other along the central axis direction of the rod body 33. The inner cavity of the innermost sleeve forms a groove 31, the outermost sleeve is connected to the insulating handle 34, and one of the at least two sleeves is provided with a perforation 32.

[0051] Specifically, the rod body 33 includes at least two, preferably but not limited to three, hollow sleeves extending in the left - right direction. In other words, the sleeves extend in the left - right direction and have an annular cross - section. The three sleeves are nested in sequence from the inside to the outside, and every two adjacent sleeves can slide relative to each other in the left - right direction, so that the rod body 33 is telescopic in the left - right direction.

[0052] The inner cavity of the innermost sleeve forms a groove 31, so that the left end of the innermost sleeve is detachably connected to the carbon brush holder 2, the right end of the outermost sleeve is connected to the insulating handle 34, and the middle sleeve is provided with a perforation 32.

[0053] When the generator rotor shaft voltage detection device of the embodiment of the present invention is in use, first adjust the length of the rod body 33 according to the distance between the operator and the large shaft of the generator, then hold the insulating handle 34 to move the carbon brush 1 and make the carbon brush 1 generally parallel to the large shaft of the generator, and then press the carbon brush 1 on the surface of the large shaft of the generator. After observing that the rotation speed of the carbon brush 1 is stable and there is no jamming, observe and record the detection data on the multimeter.

[0054] Preferably, the generator rotor shaft voltage detection device is assembled before use and disassembled after use. The carbon brush shaft 4 with the carbon brush 1, the carbon brush holder 2, and the grip 3 are placed separately and stored in a dry environment.

[0055] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is 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 should not be construed as a limitation of the present invention.

[0056] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0057] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0059] In the present invention, the terms "an embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0060] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A generator rotor shaft voltage detection device, characterized in that: include: A carbon brush (1), a carbon brush holder (2) and a handle (3), wherein the carbon brush (1) is arranged in a cylindrical shape, the carbon brush (1) and the carbon brush holder (2) are pivotally connected around the central axis of the carbon brush (1), and the carbon brush holder (2) is connected to the handle (3) and is used for being electrically connected to a multimeter.

2. The generator rotor shaft voltage detection device according to claim 1, characterized in that: The carbon brush holder (2) is detachably connected to the handle (3).

3. The generator rotor shaft voltage detection device according to claim 2, characterized in that: It also includes a carbon brush shaft (4), wherein the carbon brush (1) is sleeved on the outer circumference of the carbon brush shaft (4); The carbon brush holder (2) comprises a base (21), a first bracket (22) and a second bracket (23); the base (21) is detachably connected to the handle (3); the first bracket (22) and the second bracket (23) are arranged on the base (21) and are spaced apart; the carbon brush shaft (4) is located between the first bracket (22) and the second bracket (23); the first end of the carbon brush shaft (4) is pivotally connected to the first bracket (22); and the second end of the carbon brush shaft (4) is pivotally connected to the second bracket (23).

4. The generator rotor shaft voltage detection device according to claim 3, characterized in that: The base (21) is provided with a boss (211), one end of the handle (3) is provided with a groove (31), and the boss (211) is detachably fitted in the groove (31).

5. The generator rotor shaft voltage detection device according to claim 4, characterized in that: The boss (211) is provided with an external thread, and the groove (31) is provided with an internal thread, and the internal thread is adapted to the external thread.

6. The generator rotor shaft voltage detection device according to claim 4, characterized in that: The boss (211) is connected to a measuring lead (5) connected to the multimeter, and the handle (3) is provided with a through hole (32) connected to the groove (31), and the through hole (32) is used to pass the measuring lead (5).

7. The generator rotor shaft voltage detection device according to claim 6, characterized in that: The handle (3) comprises a rod body (33) and an insulating handle (34); the rod body (33) is provided with the groove (31) and the through hole (32).

8. The generator rotor shaft voltage detection device according to claim 7, characterized in that: The rod body (33) is configured to be retractable along the center line direction of the rod body (33).

9. The generator rotor shaft voltage detection device according to claim 8, characterized in that: The rod body (33) comprises at least two sleeve rods which are sleeved in sequence. Along the sleeved direction, each two adjacent sleeve rods can slide relatively along the center line direction of the rod body (33). The inner cavity of the innermost sleeve rod forms the groove (31). The outermost sleeve rod is connected to the insulating handle (34). At least one of the two sleeve rods is provided with the through hole (32).

10. The generator rotor shaft voltage detection device according to claim 3, characterized in that: The carbon brush (1) is made of graphite, and the carbon brush holder (2) and the carbon brush shaft (4) are made of metal.

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