Special tool for measuring shaft voltage of generator and measuring system
By using a flexible device to connect the carbon brush and the insulating rod in the generator shaft voltage measuring tool, the problem of poor contact between the carbon brush and the generator shaft was solved, achieving accurate measurement and safety protection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2026-04-03
AI Technical Summary
Existing generator shaft voltage measuring tools are inaccurate because the carbon brushes cannot maintain continuous contact with the generator shaft when the operator holds the insulating rod, and there is a risk of damage caused by poor contact between the carbon brushes and the shaft.
A special tool for measuring generator shaft voltage was designed. It uses an elastic device to connect the carbon brush and the insulating rod to ensure that the carbon brush can always be in close contact with the generator shaft. The elastic device supports the carbon brush, enabling accurate measurement.
It improves the accuracy of generator shaft voltage measurement, protects the generator shaft from damage, reduces the risk of electric shock and being caught in the shaft, and improves work efficiency.
Smart Images
Figure CN224083312U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of generator shaft voltage measurement technology, and in particular to a special tool and measurement system for measuring generator shaft voltage. Background Technology
[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.
[0003] The voltage induced on the shaft by the unbalanced alternating magnetic field inside the generator is called shaft voltage. When the shaft voltage is sufficient to break down the oil film between the shaft and the bearing, a discharge phenomenon will occur. The shaft current will gradually degrade the quality of the lubricating and cooling oil, and in severe cases, it will burn out the bearing shell, forcing the generator to shut down and causing an accident. Therefore, checking and measuring the shaft voltage of the generator is essential.
[0004] Current tools for measuring generator shaft voltage directly connect carbon brushes to an insulating rod. The operator holds the insulating rod and brings the carbon brushes into contact with the generator shaft to measure the generator shaft voltage. However, because the operator cannot guarantee that the generator shaft and carbon brushes will remain in constant contact while operating the insulating rod, the accuracy of the generator shaft voltage measurement cannot be guaranteed. Utility Model Content
[0005] To address the aforementioned problems, this invention proposes a dedicated tool and system for measuring generator shaft voltage. By incorporating an elastic device between the carbon brush and the insulating rod, it ensures that the carbon brush remains in close contact with the generator shaft at all times during shaft voltage measurement, thereby guaranteeing the accuracy of the generator shaft voltage measurement.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] In the first aspect, a special tool for measuring generator shaft voltage is proposed, including an insulating rod, a carbon brush, and a voltage measuring device. The carbon brush is connected to the voltage measuring device through a wire, and the carbon brush is connected to the insulating rod through a mounting base. The mounting base includes a connecting sleeve and an elastic device. One end of the connecting sleeve is connected to the insulating rod, and the other end of the connecting sleeve is connected to the carbon brush through the elastic device.
[0008] Furthermore, one end of the carbon brush is located inside the connecting sleeve and can move axially along the connecting sleeve; the other end of the carbon brush extends out of the connecting sleeve; one end of the elastic device is connected to the end of the carbon brush located inside the connecting sleeve, and the other end of the elastic device is connected to the connecting sleeve.
[0009] Furthermore, the connecting sleeve includes a fixed retainer and a third fixed retainer; the fixed retainer is connected to the insulating rod; the third fixed retainer is detachably connected to the second fixed retainer; the carbon brush is connected to the third fixed retainer via an elastic device.
[0010] Furthermore, the third fixing sleeve is fitted onto the outside of the fixing bracket.
[0011] Furthermore, the fixing bracket includes a first fixing sleeve and a second fixing sleeve; the first fixing sleeve is connected to the insulating rod, the second fixing sleeve is detachably connected to the first fixing sleeve, and the third fixing sleeve is detachably connected to the second fixing sleeve.
[0012] Furthermore, the first fixing sleeve is fitted onto the outside of the insulating rod.
[0013] Furthermore, the second retaining sleeve is fitted inside the first retaining sleeve.
[0014] Furthermore, a channel is provided through the insulating rod; one end of the wire is connected to the carbon brush, and the other end of the wire passes through the channel on the insulating rod and is connected to the voltage measuring device.
[0015] Furthermore, a sealing device is installed at the connection between the insulated rod end and the wire.
[0016] Secondly, a generator shaft voltage measurement system is proposed, including a generator shaft voltage measurement tool proposed in the first aspect.
[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0018] This utility model proposes a special tool and system for measuring generator shaft voltage. The connecting sleeve is connected to the insulating rod, and the carbon brush is connected to the connecting sleeve through an elastic device. When measuring the generator shaft voltage, the elastic device supports the carbon brush, so that the carbon brush can always be in close contact with the generator shaft, thus ensuring the accuracy of the generator shaft voltage measurement.
[0019] The advantages of this invention in additional aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.
[0021] Figure 1 This is a schematic diagram of the overall structure of a special tool for measuring generator shaft voltage disclosed in an embodiment;
[0022] Figure 2 This is a schematic diagram of the insulating rod structure disclosed in the embodiment;
[0023] Figure 3This is a schematic diagram of the connection structure between the carbon brush and the elastic device disclosed in the embodiment;
[0024] Figure 4 This is a schematic diagram of the second fixing sleeve structure disclosed in the embodiment;
[0025] Figure 5 This is a schematic diagram of the first fixed ferrule structure disclosed in the embodiment.
[0026] Among them: 1. Insulating rod, 2. First fixing sleeve, 3. Second fixing sleeve, 4. Third fixing sleeve, 5. Elastic device, 6. Carbon brush, 7. Wire, 8. Sealing position, 9. Internal thread, 10. External thread, 11. Bolt. Detailed implementation method:
[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0028] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.
[0029] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0030] In this utility model, terms such as "fixed connection," "connected," and "joined" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be determined according to the specific circumstances, and should not be construed as a limitation of this utility model.
[0031] Example 1
[0032] In this embodiment, a special tool for measuring generator shaft voltage is disclosed, such as... Figures 1-5 As shown, it includes an insulating rod 1, a carbon brush 6, and a voltage measuring device. The carbon brush 6 is connected to the voltage measuring device via a wire 7. The carbon brush 6 is connected to the insulating rod 1 via a mounting base. The mounting base includes a connecting sleeve and an elastic device 5. One end of the connecting sleeve is connected to the insulating rod 1, and the other end of the connecting sleeve is connected to the carbon brush 6 via the elastic device 5.
[0033] One end of the carbon brush 6 is located inside the connecting sleeve and can move axially along the connecting sleeve; the other end of the carbon brush 6 extends out of the connecting sleeve; one end of the elastic device 5 is connected to the end of the carbon brush 6 located inside the connecting sleeve, and the other end of the elastic device 5 is connected to the connecting sleeve.
[0034] The connecting sleeve includes a fixed bracket and a third fixed bracket 4; the fixed bracket is connected to the insulating rod 1; the third fixed bracket 4 is detachably connected to the second fixed bracket; the carbon brush 6 is connected to the third fixed bracket 4 through an elastic device 5.
[0035] The third fixing sleeve 4 is fitted onto the outside of the fixing slot.
[0036] The fixing bracket includes a first fixing sleeve 2 and a second fixing sleeve 3; the first fixing sleeve 2 is connected to the insulating rod 1, the second fixing sleeve 3 is detachably connected to the first fixing sleeve 2, and the third fixing sleeve 4 is detachably connected to the second fixing sleeve 3.
[0037] The first fixing sleeve 2 is fitted onto the outside of the insulating rod 1.
[0038] The second fixing sleeve 3 is fitted inside the first fixing sleeve 2.
[0039] Preferably, the first fixing sleeve 2 is fixed to one end of the insulating rod 1 by bolt 11; the first fixing sleeve 2 is provided with external thread 10, and one end of the second fixing sleeve 3 is provided with internal thread 9. The internal thread 9 and the external thread 10 are threadedly connected. The second fixing sleeve 3 is detachably fitted onto the outside of the first fixing sleeve 2, and the other end of the second fixing sleeve 3 is fitted onto the outside of the third fixing sleeve 4 and connected by bolt.
[0040] The removable design between the various card holders allows for the replacement of each card holder, carbon brush, and elastic device.
[0041] In addition, bolt 11 can be replaced by screws, rivets, and pins.
[0042] An insulating rod 1 has a channel running through it; one end of the wire 7 is connected to the carbon brush 6, and the other end of the wire 7 passes through the channel on the insulating rod 1 and is connected to the voltage measuring device.
[0043] A sealing device is installed at the connection between the insulating rod end and the conductor 7, such as... Figure 1 At the sealing position 8 shown, the sealing device can be a sealant. The sealant is used to fix and seal the sealing position 8, ensuring that the wire inside the insulating rod is not subjected to external force.
[0044] The end of the conductor 7 that connects to the voltage measuring device is equipped with a terminal block that matches the voltage measuring device. The conductor 7 can be directly connected to the voltage measuring device through this terminal block, and then the generator shaft voltage can be measured through the voltage measuring device.
[0045] The voltage measuring device in this embodiment can be a voltmeter or a multimeter.
[0046] The insulating rod is made of epoxy resin insulating material and has a smooth outer surface.
[0047] This embodiment presents a dedicated tool and system for measuring generator shaft voltage. A connecting sleeve is connected to an insulating rod, and a carbon brush is connected to the connecting sleeve via an elastic device. During generator shaft voltage measurement, the elastic device supports the carbon brush, ensuring constant close contact between the brush and the generator shaft. This guarantees the accuracy of the measurement and prevents inaccurate readings due to poor contact. Furthermore, using the carbon brush as a conductor effectively protects the generator shaft from damage. The wire passes through the inside of the insulating rod, preventing external pulling and minimizing damage. The insulating rod also significantly protects testing personnel, greatly reducing the risk of electric shock and entanglement in the shaft. The wire's tail is designed with a plug for direct connection to the voltage measuring device, shortening wiring time and improving work efficiency.
[0048] Example 2
[0049] In this embodiment, a generator shaft voltage measurement system is disclosed, including a generator shaft voltage measurement tool disclosed in Embodiment 1.
[0050] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
[0051] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.
Claims
1. A special tool for measuring generator shaft voltage, comprising an insulating rod, a carbon brush, and a voltage measuring device, wherein the carbon brush is connected to the voltage measuring device via a wire, characterized in that, The carbon brush is connected to the insulating rod via a mounting base, which includes a connecting sleeve and an elastic device; one end of the connecting sleeve is connected to the insulating rod, and the other end of the connecting sleeve is connected to the carbon brush via the elastic device.
2. The special tool for measuring generator shaft voltage as described in claim 1, characterized in that, One end of the carbon brush is located inside the connecting sleeve and can move axially along the connecting sleeve; the other end of the carbon brush extends out of the connecting sleeve; one end of the elastic device is connected to the end of the carbon brush located inside the connecting sleeve, and the other end of the elastic device is connected to the connecting sleeve.
3. The special tool for measuring generator shaft voltage as described in claim 1, characterized in that, The connecting sleeve includes a fixed sleeve and a third fixed sleeve; the fixed sleeve is connected to the insulating rod; the third fixed sleeve is detachably connected to the second fixed sleeve; the carbon brush is connected to the third fixed sleeve through an elastic device.
4. A special tool for measuring generator shaft voltage as described in claim 3, characterized in that, The third fixing sleeve is fitted onto the outside of the fixing slot.
5. A special tool for measuring generator shaft voltage as described in claim 1, characterized in that, The fixing bracket includes a first fixing sleeve and a second fixing sleeve; the first fixing sleeve is connected to the insulating rod, and the second fixing sleeve is detachably connected to the first fixing sleeve; the third fixing sleeve is detachably connected to the second fixing sleeve.
6. A special tool for measuring generator shaft voltage as described in claim 5, characterized in that, The first fixing sleeve is fitted onto the outside of the insulating rod.
7. A special tool for measuring generator shaft voltage as described in claim 5, characterized in that, The second retaining sleeve is fitted inside the first retaining sleeve.
8. A special tool for measuring generator shaft voltage as described in claim 1, characterized in that, A channel is provided through the insulating rod; one end of the wire is connected to the carbon brush, and the other end of the wire passes through the channel on the insulating rod and is connected to the voltage measuring device.
9. A special tool for measuring generator shaft voltage as described in claim 1, characterized in that, A sealing device is installed at the connection between the insulated rod end and the wire.
10. A generator shaft voltage measurement system, characterized in that, Includes a special tool for measuring generator shaft voltage as described in any one of claims 1-9.