Real-time monitoring device for wear length of generator carbon brush

Abstract

The utility model relates to the technical field of motor carbon brush length monitoring equipment, in particular to a generator carbon brush abrasion length real-time monitoring device, which is characterized in that a brush box is arranged on a generator brush holder, a carbon brush is arranged in the brush box, a volute spiral spring is arranged on the generator brush holder, and the carbon brush is arranged in the volute spiral spring. One end of the volute spiral spring is fixedly connected with the generator brush holder, the other end of the volute spiral spring is correspondingly matched with the carbon brush, the volute spiral spring is provided with a resistance strain gauge corresponding to the carbon brush, and the resistance strain gauge is electrically connected with the monitor through a monitoring line. The characteristic that the resistance of the foil type resistance strain gauge changes linearly after being bent is utilized, the resistance change caused by spring curling deformation due to carbon brush abrasion can be caught sensitively, the residual length of the carbon brush can be monitored with high precision, and compared with the prior art, the sensitivity is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor carbon brush length monitoring equipment, in particular to a real-time monitoring device for the wear length of a generator carbon brush. Background Art

[0002] When installing a generator's carbon brushes, it's important to ensure they maintain a certain level of compression against the generator's main shaft (main shaft). However, as the brushes wear and shorten, their compression gradually decreases. Therefore, if the brushes are too short, the generator must be shut down, the brushes removed, and their length measured to determine if they meet the requirements. This determines whether they need to be replaced. Furthermore, abnormal shaft current may also be caused by abnormal brush wear, requiring the brushes to be removed for length measurement. Frequent brush removal for length measurement can lead to lower generator efficiency.

[0003] The existing carbon brushes are mainly composed of carbon and keep in contact with the rotating generator main shaft under a certain pressure, so the carbon brushes are easily worn. Therefore, the carbon brushes used for generator excitation need to be inspected regularly for wear. When the carbon brushes are severely worn, they need to be replaced in time to ensure the normal operation of the generator. If the staff does not inspect in time or is not careful enough to find the problem in time, the severely worn carbon brushes will be too short, the pressure of the retaining spring will be reduced, the friction between the carbon brush and the slip ring will be reduced, the contact resistance will increase, and the current will be reduced. This will cause the remaining normal carbon brushes to carry a larger current and cause heating. In severe cases, it will cause ring fire, affecting the safe operation of the generator, which is a major hidden danger to the safe operation of the generator set.

[0004] A Chinese patent application (publication number: CN207231935U) discloses an online monitoring device for carbon brush wear in hydro-turbine generators. This device can accurately measure carbon brush wear using a laser sensor on the brush holder, allowing for constant monitoring of carbon brush usage and significantly improving unit operation and maintenance. However, this patent application still suffers from the following technical issues:

[0005] The carbon brush wear monitoring device disclosed in the patent has a complex structure, low sensitivity, inconvenient use and high cost.

[0006] Therefore, in order to solve the above technical problems, the present application provides a real-time monitoring device for the wear length of generator carbon brushes. Utility Model Content

[0007] In response to the deficiencies in the above-mentioned background technology, the utility model addresses the technical problems of the current carbon brush wear monitoring device, which is complex in structure, low in sensitivity, inconvenient to use and high in cost. A real-time monitoring device for the wear length of the generator carbon brush is proposed to solve the above-mentioned technical problems.

[0008] The technical solution of the present utility model is achieved as follows: a real-time monitoring device for the wear length of a generator carbon brush includes a generator brush holder, which is characterized in that: a brush box is provided on the generator brush holder, a carbon brush is provided inside the brush box, a vortex spring is provided on the generator brush holder, one end of the vortex spring is fixedly connected to the generator brush holder, and the other end corresponds to the carbon brush, a resistance strain gauge corresponding to the carbon brush is provided on the vortex spring, and the resistance strain gauge is electrically connected to the monitor through a monitoring line.

[0009] As a preferred solution, the scroll spring is a scroll constant-pressure spring.

[0010] As a preferred solution, the resistance strain gauge is a foil resistance strain gauge.

[0011] As a preferred solution, it further comprises a sound or light alarm device, and the sound or light alarm device is electrically connected to the monitor.

[0012] As a preferred solution, the device further comprises a display device, and the display device is electrically connected to the monitor.

[0013] As a preferred solution, the length of the resistance strain gauge is greater than the straight-line distance between the volute spring and the generator brush holder.

[0014] Beneficial effects of the utility model:

[0015] 1. Compared with the complex structures commonly found in some existing carbon brush wear monitoring devices, the structure of this utility model is relatively simple, and the monitoring system is mainly constructed around core components such as carbon brushes, springs and resistance strain gauges.

[0016] Second, by utilizing the characteristic that the resistance of foil strain gauges changes linearly after being bent, it can keenly capture the resistance change caused by spring curling deformation due to carbon brush wear, thereby monitoring the remaining length of the carbon brush with high precision, which is more sensitive than existing technologies.

[0017] 3. The monitoring function is achieved by setting a resistance strain gauge on the spring in a relatively simple way, without the need for complex equipment such as laser sensors. It is easy to operate and use, and reduces costs to a certain extent.

[0018] Other advantages, objectives and features of the present invention will be described in part in the following description and will be apparent to those skilled in the art based on an examination of the following or may be learned from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the installation structure of the utility model;

[0021] Figure 2 This is a schematic diagram of a scroll spring of the present invention;

[0022] Figure 3 This is a schematic diagram of the connection between the scroll spring and the monitor of the present utility model;

[0023] In the figure: 1: generator brush holder, 2: brush box, 3: carbon brush, 4: scroll spring, 5: resistance strain gauge, 6: monitor. DETAILED DESCRIPTION

[0024] The following is a combination of the appended examples of the present invention Figure 1-3 The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort shall fall within the scope of protection of the present invention.

[0025] Example 1, a real-time monitoring device for the wear length of a generator carbon brush, including a generator brush holder 1, characterized in that: the generator brush holder 1 is provided with a brush box 2, the brush box 2 is provided with a carbon brush 3 inside, the generator brush holder 1 is provided with a vortex spring 4, one end of the vortex spring 4 is fixedly connected to the generator brush holder 1, and the other end corresponds to the carbon brush 3, the vortex spring 4 is provided with a resistance strain gauge 5 corresponding to the carbon brush 3, and the resistance strain gauge 5 is electrically connected to the monitor through a monitoring line.

[0026] When in use, the resistance strain gauge 5 can be connected to the scroll spring 4 by gluing. One end of the scroll spring 4 is fixedly connected to the generator brush holder 1, and the other end contacts the rear end of the carbon brush 3 to generate a spring force. As the carbon brush 3 gradually shortens due to wear, it will move toward the main axis along with the carbon brush 3, resulting in curling deformation.

[0027] The resistance change of the resistance strain gauge 5 is input into the monitor. In this way, the monitor monitors the change in the resistance of the resistance strain gauge 5 in real time, which reflects the degree of curling deformation of the scroll spring 4 and indirectly reflects the distance the carbon brush 3 moves forward, which can reflect the remaining length of the carbon brush 3 (or the amount of wear of the carbon brush 3). When the monitor detects that the resistance change of the resistance strain gauge 5 reaches the set process value, it is judged that the wear of the scroll spring 4 has entered the attention period and the wear of the carbon brush 3 needs to be observed in detail. When the monitor detects that the resistance change of the resistance strain gauge 5 reaches the set threshold value, it indicates that the carbon brush 3 has reached the set wear length and needs to be replaced immediately.

[0028] Compared with the existing technology, the present application utilizes the characteristic that the resistance of the foil resistance strain gauge 5 changes linearly after being bent, and can keenly capture the resistance change caused by the spring curling deformation due to the wear of the carbon brush 3, thereby monitoring the remaining length of the carbon brush 3 with high precision, and improving the phase sensitivity.

[0029] As a further embodiment, the vortex spring 4 is a vortex constant pressure spring. The vortex spring 4 usually adopts a vortex constant pressure spring to keep its pressure constant. One end of the vortex spring 4 is fixed on the generator brush holder 1, and the other end contacts the rear end of the carbon brush 3 to generate a spring force. When the carbon brush 3 gradually shortens due to wear, it will move toward the main axis with the carbon brush 3 and produce curling deformation.

[0030] As a further embodiment, the resistance strain gauge 5 is a foil resistance strain gauge 5 , and the resistance of the foil resistance strain gauge changes significantly after being bent, usually in a linear manner; the resistance strain gauge 5 is electrically connected to the monitor 6 through a monitoring line.

[0031] As a further embodiment, the length of the resistance strain gauge 5 is greater than the straight-line distance length of the spiral spring 4 fixed on the generator brush holder 1. The resistance strain gauge 5 is set on the entire length of the spiral spring 4, and can also be set on a section of the spiral spring 4, at least on the straight section at the fixed end of the spiral spring 4 and the generator brush holder 1. When the spiral spring 4 curls as the carbon brush 3 wears, the straight section gradually deforms into a curved section, so that the resistance change caused by its deformation can be monitored by the monitor 6 and can reflect the remaining length of the carbon brush.

[0032] Example 2, a real-time monitoring device for the wear length of a generator carbon brush, based on Example 1, further includes a sound or light alarm device, and the sound or light alarm device is electrically connected to the monitor 6.

[0033] During use, when the monitor 6 detects that the resistance change of the resistance strain gauge 5 reaches the set process value, an alarm prompt is issued through sound or light, etc., which can remind the operator to issue an early warning as quickly as possible, stop the equipment from continuing to run, and avoid irreparable losses.

[0034] Example 3, a real-time monitoring device for the wear length of a generator carbon brush, based on Example 1, further includes a display device, and the display device is electrically connected to the monitor 6.

[0035] After the monitor 6 converts the resistance value of the resistance strain gauge 5 into the length of the worn carbon brush through calculation, the worn length of the carbon brush (or the remaining length of the carbon brush) is displayed on the display device, which is conducive to the operator to see the data intuitively, further improving the overall intelligence and safety of the equipment.

[0036] In this application, unless otherwise specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they can refer to fixed, removable, or integrated connections; mechanical or electrical connections; direct or indirect connections through an intermediary; internal communication between two components; or interactions between two components. A person skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances. In this application, unless otherwise specified or limited, "above" or "below" a first feature refers to direct contact between the first and second features, or indirect contact between the first and second features through an intermediary. Furthermore, "above," "above," and "above" a first feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. "Below," "below," and "below" a first feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. 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 can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0037] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A real-time monitoring device for the wear length of a generator carbon brush, comprising a generator brush holder (1), characterized in that: The generator brush holder (1) is provided with a brush box (2), a carbon brush (3) is provided inside the brush box (2), a vortex spring (4) is provided on the generator brush holder (1), one end of the vortex spring (4) is fixedly connected to the generator brush holder (1), and the other end is matched with the carbon brush (3), a resistance strain gauge (5) corresponding to the carbon brush (3) is provided on the vortex spring (4), and the resistance strain gauge (5) is electrically connected to the monitor through a monitoring line.

2. The real-time monitoring device for generator carbon brush wear length according to claim 1, characterized in that: The volute spring (4) is a volute constant-pressure spring.

3. The real-time monitoring device for generator carbon brush wear length according to claim 1, characterized in that: The resistance strain gauge (5) is a foil-type resistance strain gauge.

4. The real-time monitoring device for generator carbon brush wear length according to claim 1, characterized in that: It also includes a sound or light alarm device, which is electrically connected to the monitor (6).

5. The real-time monitoring device for generator carbon brush wear length according to claim 1, characterized in that: It also includes a display device, and the display device is electrically connected to the monitor (6).

6. A real-time monitoring device for generator carbon brush wear length according to any one of claims 1 to 5, characterized in that: The length of the resistance strain gauge (5) is greater than the straight-line distance between the volute spring (4) and the generator brush holder (1).

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