Voltage measuring device for generator shaft

Abstract

The utility model relates to a voltage measuring device for a generator shaft, and the device comprises a carbon brush which is in conductive contact with the generator shaft; the shell comprises an outer shell and a tube body, the carbon brush is installed at one end of the tube body, the tube body is arranged in the outer shell and is in sliding connection with the outer shell, the extension direction of the tube body is consistent with that of the outer shell, and the outer shell is provided with a first opening; the voltage measuring device for the generator shaft comprises a shell, a tube body, a first opening and a driving part, the driving part is connected to the tube body and extends out of the shell, the driving part is used for driving the tube body to slide relative to the shell, so that the carbon brush extends out of the first opening, and the voltage measuring device for the generator shaft can adjust the extension amount of the carbon brush.

Description

Technical Field

[0001] The present disclosure relates to the technical field of generator shaft voltage measurement, and in particular, to a voltage measurement device for a generator shaft. Background Art

[0002] During generator installation and operation, voltage may be generated on the generator shaft for certain reasons. Pulsed shaft voltage caused by controlled static excitation can damage the oil film. Generator shaft voltage is related to the load it carries during operation. Generally speaking, the higher the load, the greater the shaft voltage. If improper shaft voltage suppression and protection measures are not implemented, when the shaft voltage reaches a certain value, the oil film will be broken down, generating shaft currents, causing electrical corrosion on the shaft neck and bearing surface, and damaging the generator shaft.

[0003] In the related art, during the startup of a gas turbine generator after maintenance, it is necessary to measure the generator shaft voltage on the high-speed rotating rotor. When the generator shaft voltage measuring tool uses a carbon brush to contact the generator shaft for measurement, since the length of the carbon brush is fixed, if the carbon brush is extended too long, it may break during the contact measurement process with the generator shaft. If the carbon brush is extended too short, the carbon brush will continue to wear during the measurement process and the length of the carbon brush cannot be adjusted in time, making it inconvenient to continuously measure the generator shaft voltage during rotation. Utility Model Content

[0004] An object of the present disclosure is to provide a voltage measuring device for a generator shaft, wherein the voltage measuring device provided for the generator shaft is capable of adjusting the extension amount of a carbon brush.

[0005] In order to achieve the above-mentioned objectives, the present disclosure provides a voltage measuring device for a generator shaft, the voltage measuring device for a generator shaft comprising: a carbon brush, the carbon brush being used for conductive contact with the generator shaft; a housing, the housing comprising an outer shell and a tube body, the carbon brush being mounted on one end of the tube body, the tube body being placed in the outer shell and being slidably connected to the outer shell, the tube body and the outer shell having an extension direction consistent with that of the outer shell, and the outer shell having a first opening; and a driving member, the driving member being connected to the tube body and extending out of the outer shell, the driving member being used to drive the tube body to slide relative to the outer shell so that the carbon brush extends out of the first opening.

[0006] Optionally, the driving member is provided on the outer wall of the tube body, the shell is provided with a through limiting groove, the driving member extends out of the shell and is placed in the limiting groove, and the extension direction of the limiting groove is consistent with the extension direction of the shell.

[0007] Optionally, one of the outer wall of the tube body and the inner wall of the shell is provided with a slide groove on both sides, and the other is provided with a convex strip, the convex strip is slidably matched with the slide groove, and the extension direction of the convex strip and the slide groove is consistent with the extension direction of the shell.

[0008] Optionally, the cross sections of the sliding groove and the convex strip are both T-shaped.

[0009] Optionally, the carbon brush includes a carbon brush body and a brush braid, and the voltage measuring device for the generator shaft also includes a signal transmission component, the signal transmission component includes a wire and a signal output component, the wire and the brush braid are arranged in the shell, one end of the wire is connected to the signal output component, and the other end is connected to the brush braid, and the signal output component is provided at the end of the shell away from the carbon brush.

[0010] Optionally, a limiting member is further provided at the end of the tube body, and the limiting member includes a first limiting portion and a second limiting portion, and the carbon brush body is clamped between the first limiting portion and the second limiting portion.

[0011] Optionally, the tube body is hollow, and a first channel is configured in the tube body. The first channel penetrates the tube body along an extension direction of the tube body, and the brush braid wire and the conductive wire pass through the first channel.

[0012] Optionally, a first handle is connected to the housing, and the first handle is arranged away from the carbon brush.

[0013] Optionally, a second handle is connected to the housing, the second handle is arranged close to the carbon brush, and the first handle and the second handle are respectively arranged on opposite sides of the housing.

[0014] Optionally, the carbon brush is detachably connected to the tube body.

[0015] Through the above technical solution, when it is necessary to measure the voltage of the generator shaft during operation, the carbon brush can serve as the access point for measuring the voltage. Since the generator shaft rotates at high speed during operation, the carbon brush will wear when it contacts the generator shaft until the portion of the carbon brush exposed from the first opening is flush with or slightly exceeds the first opening, making it difficult to contact the carbon brush with the generator shaft. By installing the carbon brush at the end of the tube body and using a drive member to drive the carbon brush out of the first opening, the carbon brush connected to the end of the tube body and placed in the housing can be exposed from the first opening, so that the carbon brush can continue to contact the generator shaft and measure the voltage. With the above structure, by providing a drive member to drive the carbon brush out of the first opening, the extension amount of the carbon brush can be adjusted as needed. This avoids the situation where the installed carbon brush is too long, which may cause the carbon brush to break when contacting the rotating generator shaft. At the same time, the installation amount of the carbon brush in the housing is guaranteed, thereby extending the service life of the voltage measuring device and avoiding the need for frequent replacement of the measuring tool due to carbon brush wear.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0018] Figure 1 1 is a schematic diagram of the housing structure of a voltage measuring device for a generator shaft provided according to an embodiment of the present disclosure;

[0019] Figure 2 1 is a schematic diagram of the end structure of one end of a housing of a voltage measuring device for a generator shaft provided according to an embodiment of the present disclosure;

[0020] Figure 3 is a cross-sectional view of a tube body of a voltage measuring device for a generator shaft provided according to an embodiment of the present disclosure;

[0021] Figure 4 1 is a schematic diagram of one end of a tube body of a voltage measuring device for a generator shaft provided according to an embodiment of the present disclosure;

[0022] Figure 5 Schematic diagram of the other end of the tube body of the voltage measuring device for the generator shaft provided according to an embodiment of the present disclosure.

[0023] Description of Reference Numerals

[0024] 1-carbon brush, 11-carbon brush body, 12-brush braid, 2-shell, 21-housing, 211-slide, 212-first opening, 22-tube, 221-rib, 23-limiting groove, 3-driving member, 41-wire, 42-signal output member, 51-first handle, 52-second handle, 6-limiting member, 61-first limiting portion, 62-second limiting portion. DETAILED DESCRIPTION

[0025] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0026] In this disclosure, unless otherwise indicated, the directional terms "inside" and "outside" refer to the "inside" and "outside" relative to the outline of the corresponding component itself. Furthermore, the use of terms such as "first" and "second" is intended to distinguish different components and does not imply order or importance. Furthermore, in the following description, when referring to the accompanying drawings, the same reference numerals in different drawings represent the same elements. Those skilled in the art should understand that the above definitions are intended only to explain and illustrate this disclosure and should not be construed as limitations of this disclosure.

[0027] According to the specific embodiment of the present disclosure, Figures 1 to 5 As shown, a voltage measuring device for a generator shaft is provided, and the voltage measuring device for a generator shaft includes: a carbon brush 1, which is used to make conductive contact with the generator shaft; a housing 2, which includes an outer shell 21 and a tube body 22, and the carbon brush 1 is installed at one end of the tube body 22, and the tube body 22 is placed in the outer shell 21 and is slidably connected to the outer shell 21, and the extension direction of the tube body 22 is consistent with that of the outer shell 21, and the outer shell 21 has a first opening 212; and a driving member 3, which is connected to the tube body 22 and extends out of the outer shell 21, and the driving member 3 is used to drive the tube body 22 to slide relative to the outer shell 21, so that the carbon brush 1 extends out of the first opening 212.

[0028] Through the above technical solution, when it is necessary to measure the voltage of the generator shaft during operation, the carbon brush 1 can serve as the access point for measuring the voltage. Since the generator shaft rotates at high speed during operation, the carbon brush 1 will wear when it contacts the generator shaft, until the portion of the carbon brush 1 exposed from the first opening 212 is flush with or slightly exceeds the first opening 212, making it difficult to contact the carbon brush 1 with the generator shaft. By installing the carbon brush 1 at the end of the tube 22 and using the driving member 3 to drive the carbon brush 1 out of the first opening 212, the carbon brush 1 connected to the end of the tube 22 and placed in the housing 21 can be exposed from the first opening 212, so that the carbon brush 1 can continue to contact the generator shaft and perform measurement. With the above structure, the driving member 3 is provided to drive the carbon brush 1 to extend out of the first opening 212. The extension amount of the carbon brush 1 can be adjusted as needed. In this way, the installed carbon brush 1 is prevented from being too long, which may cause the carbon brush 1 to be easily broken when it contacts the rotating generator shaft. At the same time, the installation amount of the carbon brush 1 in the housing 2 is guaranteed, so as to extend the service life of the voltage measuring device and avoid the need to frequently replace the measuring tool due to the loss of the carbon brush 1.

[0029] In some embodiments of the present disclosure, reference Figure 1 As shown, the driver 3 is disposed on the outer wall of the tube body 22, and the housing 21 is provided with a through-limiting groove 23. The driver 3 extends from the housing 21 and is positioned within the limit groove 23. The extension direction of the limit groove 23 aligns with the extension direction of the housing 21. Thus, the limit groove 23 limits the rotation of the driver 3 relative to the housing 21 and serves as a guide for the sliding direction of the tube body 22, thereby ensuring the stability of the relative sliding between the tube body 22 and the housing 21. The structure is simple and easy to operate. Furthermore, the length of the limit groove 23 limits the extension range of the driver 3, preventing the tube body 22 from extending excessively beyond the housing 21, which would make it difficult to retract the tube body 22.

[0030] In some embodiments of the present disclosure, reference Figure 2 As shown, one of the outer wall of the tube body 22 and the inner wall of the housing 21 is provided with a groove 211 on both sides, and the other is provided with a ridge 221. The ridge 221 slides in conjunction with the groove 211, and the extension direction of the ridge 221 and the groove 211 are both consistent with the extension direction of the housing 21. Thus, the sliding engagement between the ridge 221 and the groove 211 can guide the sliding of the tube body 22, preventing the tube body 22 from deviating from the preset sliding direction and affecting the extension of the carbon brush 1. It can also limit the rotation of the tube body 22 relative to the housing 21 to ensure the accurate positioning of the carbon brush 1 when extended, thereby avoiding affecting the measurement results. Furthermore, the sliding connection between the tube body 22 and the housing 21, achieved through the ridge 221 and the groove 211, reduces friction between the tube body 22 and the housing 21, thereby reducing wear and extending the service life of the measuring tool.

[0031] In some embodiments of the present disclosure, reference Figure 2 and Figure 4 As shown, the cross-sections of the chute 211 and the ridge 221 are both T-shaped. This increases the contact area between the chute 211 and the ridge 221, improving the stability of the connection between the housing 21 and the tube 22. It also reduces loosening of the housing 21 and the tube 22 due to vibration or impact when the housing 21 and the tube 22 are in contact with the generator shaft for measurement, thereby improving the reliability of the connection. Furthermore, the chute 211 and the ridge 221 can limit each other, preventing the ridge 221 from disengaging from the chute 211 when the housing 2 is squeezed, thus ensuring the structural reliability of the housing 2.

[0032] In some embodiments of the present disclosure, reference Figure 3 As shown, the carbon brush 1 includes a carbon brush body 11 and a brush braid 12. The voltage measuring device for the generator shaft also includes a signal transmission component, which includes a wire 41 and a signal output component 42. The wire 41 and the brush braid 12 are arranged in the housing 2. One end of the wire 41 is connected to the signal output component 42, and the other end is connected to the brush braid 12. The signal output component 42 is provided at the end of the housing 21 away from the carbon brush 1. In this way, the carbon brush body 11 can contact the generator shaft, serving as a contact point to transmit the measured electrical signal of the generator shaft to the signal output component 42 through the brush braid 12 and the wire 41 electrically connected to the brush braid 12 in sequence, so that the staff can read and analyze the measured electrical signal through the signal transmission component.

[0033] In some embodiments of the present disclosure, reference Figure 5 As shown, a limit member 6 is further provided at the end of the tube body 22. The limit member 6 includes a first limit portion 61 and a second limit portion 62. The carbon brush body 11 is clamped between the first limit portion 61 and the second limit portion 62. Thus, the carbon brush body 11 is clamped by the first limit portion 61 and the second limit portion 62, so that the limit member 6 can fix and limit the carbon brush body 11, preventing the carbon brush body 11 from moving relative to the tube body 22. At the same time, the reliability of the connection between the carbon brush body 11 and the tube body 22 is improved, and the measurement effect is prevented from being affected by the carbon brush 1 slipping.

[0034] In some embodiments of the present disclosure, reference Figure 3 As shown, the tube body 22 is hollow and has a first channel formed therein. The first channel extends through the tube body 22 along its extension direction, through which the brush braid 12 and the wire 41 pass. This allows the brush braid 12 and the wire 41 to be arranged within the tube body 22, saving space. This eliminates the need for a separate wire trough within the housing 21, simplifies the structure of the housing 2, and reduces manufacturing costs.

[0035] In some embodiments of the present disclosure, reference Figure 1As shown, a first handle 51 is connected to the housing 21, and the first handle 51 is arranged away from the carbon brush 1. In this way, the first handle 51 can be used to apply force to the housing 2 to make the carbon brush 1 contact the generator shaft, ensuring the stability of the housing 2 during measurement, reducing the occurrence of situations where hand shaking affects the measurement effect, and at the same time, making it easier for workers to hold and operate the housing 2, improving ease of use.

[0036] In some embodiments of the present disclosure, reference Figure 1 As shown, a second handle 52 is connected to the housing 21, and the second handle 52 is arranged near the carbon brush 1. The first handle 51 and the second handle 52 are respectively arranged on opposite sides of the housing 21. In this way, when measuring, the operator can hold the first handle 51 and the second handle 52 with both hands to provide two stable support points, thereby reducing the risk of the housing 2 being thrown away due to loss of balance when operating the housing 2 close to the high-speed rotating generator shaft with one hand. Therefore, the stability of the housing 2 during measurement is improved, and the safety of the measurement process is guaranteed.

[0037] In some embodiments of the present disclosure, the carbon brush 1 is detachably connected to the tube body 22. In this way, when the carbon brush 1 is completely worn out, a new carbon brush 1 can be replaced, thereby realizing the repeated use of the measuring device. Wherein, when the carbon brush 1 needs to be disassembled, the carbon brush body 11 is removed from between the first limiting portion 61 and the second limiting portion 62, so that the connection between the brush braid 12 and the wire 41 is extended out of the end of the tube body 22, and the connection between the brush braid 12 and the wire 41 is disconnected, thereby realizing the disassembly of the worn carbon brush 1. Then, the brush braid 12 of the carbon brush 1 that needs to be replaced is connected to the wire 41, and the carbon brush body 11 that needs to be replaced is fixed between the first limiting portion 61 and the second limiting portion 62, thereby realizing the replacement of the carbon brush 1.

[0038] In other embodiments, the housing 21 may be provided with a removable cover, which partially covers one side of the housing 21 and is provided at one end close to the carbon brush 1. Thus, when the carbon brush 1 needs to be replaced, the tube body 22 can be exposed to the housing 21 by removing the cover for disassembly and assembly operations. The present disclosure does not impose any restrictions on this.

[0039] Below, reference Figures 1 to 5As shown, the present disclosure will combine the above-mentioned specific embodiments to provide a detailed introduction to the specific use process of the voltage measuring device for the generator shaft. When it is necessary to measure the voltage of the generator shaft during operation, the staff member holds the first handle 51 and the second handle 52 with both hands and approaches the generator shaft to make the carbon brush 1 contact with the generator shaft for measurement. When the carbon brush 1 exposed from the first opening 212 is worn down to be flush with the first opening 212 or slightly exceeds the first opening 212, and it is inconvenient to make the carbon brush 1 contact with the generator shaft, the driving member 3 is pushed to move along the limiting groove 23, driving the tube body 22 to slide relative to the housing 21, so that the carbon brush 1 connected to the end of the tube body 22 and placed in the housing 21 can be exposed from the first opening 212, so that the carbon brush 1 can continue to contact with the generator shaft, thereby achieving measurement of the generator shaft.

[0040] When it is necessary to replace the completely consumed carbon brush 1, the carbon brush body 11 between the first limiting part 61 and the second limiting part 62 is removed, and the connection between the brush braid 12 and the wire 41 is disconnected. After the brush braid 12 of the carbon brush 1 to be replaced is connected to the wire 41 in the tube body 22, the carbon brush body 11 to be replaced is fixed between the first limiting part 61 and the second limiting part 62, thereby realizing the replacement of the carbon brush 1.

[0041] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0042] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0043] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A voltage measuring device for a generator shaft, characterized in that: The voltage measuring device for the generator shaft comprises: a carbon brush configured to be in conductive contact with a generator shaft; A housing, the housing comprising an outer shell and a tube, the carbon brush being mounted on one end of the tube, the tube being disposed within the housing and slidably connected thereto, the tube extending in the same direction as the housing, and the housing having a first opening; and A driving member is connected to the tube body and extends out of the housing. The driving member is used to drive the tube body to slide relative to the housing so that the carbon brush extends out of the first opening.

2. The voltage measuring device for a generator shaft according to claim 1, characterized in that: The driving member is arranged on the outer wall of the tube body, the shell is provided with a through limiting groove, the driving member extends out of the shell and is placed in the limiting groove, and the extending direction of the limiting groove is consistent with the extending direction of the shell.

3. The voltage measuring device for a generator shaft according to claim 1, characterized in that: Slide grooves are provided on both sides of one of the outer wall of the tube body and the inner wall of the shell, and a ridge is provided on the other side. The ridge is slidably matched with the slide groove, and the extension direction of the ridge and the slide groove is consistent with the extension direction of the shell.

4. The voltage measuring device for a generator shaft according to claim 3, characterized in that: The cross sections of the sliding groove and the convex strip are both T-shaped.

5. The voltage measuring device for a generator shaft according to claim 1, characterized in that: The carbon brush includes a carbon brush body and a brush braid. The voltage measuring device for the generator shaft also includes a signal transmission component. The signal transmission component includes a wire and a signal output component. The wire and the brush braid are arranged in the shell. One end of the wire is connected to the signal output component, and the other end is connected to the brush braid. The signal output component is provided at the end of the shell facing away from the carbon brush.

6. The voltage measuring device for a generator shaft according to claim 5, characterized in that: A limiting member is further provided at the end of the tube body. The limiting member includes a first limiting portion and a second limiting portion. The carbon brush body is clamped between the first limiting portion and the second limiting portion.

7. The voltage measuring device for a generator shaft according to claim 6, characterized in that: The tube body is hollow and has a first channel therein. The first channel passes through the tube body along an extension direction of the tube body, and the brush braid wire and the conductive wire pass through the first channel.

8. The voltage measuring device for a generator shaft according to claim 1, characterized in that: The housing is connected to a first handle, and the first handle is arranged away from the carbon brush.

9. The voltage measuring device for a generator shaft according to claim 8, characterized in that: A second handle is connected to the housing, and the second handle is arranged close to the carbon brush. The first handle and the second handle are respectively arranged on opposite sides of the housing.

10. The voltage measuring device for a generator shaft according to claim 1, characterized in that: The carbon brush is detachably connected to the tube body.

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