Collecting ring protection device of brush excitation generator

Abstract

The invention belongs to the technical field of power generation equipment, and particularly relates to a brush excitation generator collecting ring protection device which comprises a box body and a controller. The box body comprises an outer housing, a temperature and humidity sensor and an air dryer; the temperature and humidity sensor and the air dryer are mounted in the outer housing; the temperature and humidity sensor and the air dryer are connected with the controller, the temperature and humidity sensor is used for monitoring and collecting environment temperature and humidity data in the outer housing in real time, generating temperature and humidity data and sending the temperature and humidity data to the controller, and the controller conducts digital-to-analog conversion processing on the temperature and humidity data, generating temperature and humidity measured values and sending the temperature and humidity measured values to the air dryer. And comparing and judging the temperature and humidity measured value with the temperature and humidity set value, generating an air dryer operation instruction or a stop instruction according to a comparison and judgment result, and controlling the air dryer to start or stop. According to the device, the humidity in the outer cover shell is controlled, a closed box body is formed, erosion of water vapor in the external environment to the collecting ring is effectively prevented, and the use effect is good.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power generation equipment, and particularly relates to a brush-excited generator collector ring protection device. BACKGROUND

[0002] The first reactor nuclear power generator of Hualong No.1 is a non-salient pole, four-pole, three-phase synchronous generator, which adopts a machine end static thyristor excitation mode, i.e., a brush excitation mode. After the rotor excitation current is introduced into the rotor through the carbon brush, it is conducted to the rotor coil through the collector ring, the conductive screw, the conductive rod and the rotor lead. The generator collector ring is made of wear-resistant alloy steel forgings and is assembled with the rotating shaft by hot fitting. An insulating sleeve is arranged between the collector ring and the rotating shaft. The carbon brush is sintered from natural graphite material and has good electrical conductivity, a low friction coefficient and certain self-lubricating performance.

[0003] During the operation of the generator, the carbon brush is in direct contact with the collector ring by being pressed against the collector ring by the coiled spring. The high temperature generated by high-speed friction and rotation can make the surrounding of the collector ring relatively dry, so that the generator will not rust due to environmental factors. During the installation stage of the generator and the non-operation period such as maintenance, the carbon brush is in direct contact with the collector ring. When the air humidity exceeds the critical humidity of steel, the steel in the collector ring will electrochemically corrode with the moisture and oxygen in the air, and the carbon powder generated by the wear of the carbon brush will accelerate this process. For the nuclear power plant built in the coastal area, the salt content in the ambient air is relatively high. Since the radius of chloride ion is small, it can easily penetrate the oxide film on the surface of the generator collector ring, accelerating the electrochemical corrosion of the collector ring. The main product of electrochemical corrosion is rust, which is composed of iron oxide (Fe2O3). Rust is porous and cannot prevent the collector ring from contacting air and water, but instead retains air and moisture on the surface of the collector ring, thereby exacerbating rusting.

[0004] The rust on the collector ring can increase its contact resistance, affect the conduction of the carbon brush current, greatly increase the electrical loss and friction loss, cause the temperature to be too high, and produce arc burn. The contact surface between the carbon brush and the collector ring becomes smaller, the contact resistance becomes larger, the temperature rises, the carbon brush sparks, and in severe cases, the carbon brush room may catch fire, causing the nuclear power unit to shut down and stop, affecting nuclear safety.

[0005] During the installation process of the Hualong No.1 generator, the collector ring and the carbon brush were attacked by rainwater due to the leakage of the primary workshop. It was found through inspection that, in addition to the rust caused by rainwater, the collector ring also had different degrees of rust marks, which were caused by improper rust prevention treatment of the collector ring during installation. In summary, there is currently a lack of an effective device or method that can provide sufficient rust protection for the generator collector ring during installation and non-operation periods, so as to reduce a series of problems caused by rusting of the collector ring. SUMMARY

[0006] The present application aims to provide a brush excitation generator collector ring protection device, which controls the humidity inside the outer shell through a temperature and humidity sensor, a controller and an air dryer, and forms a closed box through the outer shell, effectively preventing the moisture in the external environment from corroding the collector ring, and has good use effect. Effectively solve the collector ring corrosion problem that the generator may encounter during installation, maintenance and other non-operation periods. Through the application of the device, the unexpected shutdown or shutdown event of the generator unit caused by the corrosion of the collector ring can be effectively prevented, thereby significantly improving the overall operation stability and reliability of the generator unit.

[0007] The technical solution for achieving the purpose of the present application is as follows:

[0008] A brush excitation generator collector ring protection device, the device comprises a box body and a controller; the box body comprises an outer shell, a temperature and humidity sensor and an air dryer; the temperature and humidity sensor and the air dryer are installed in the outer shell; the collector ring is placed in the outer shell of the box body; the temperature and humidity sensor and the air dryer are connected with the controller respectively, the temperature and humidity sensor is used for real-time monitoring and collecting the environmental temperature and humidity data of the collector ring in the outer shell, generating temperature and humidity data and sending them to the controller, the controller performs digital-to-analog conversion processing on the temperature and humidity data to generate temperature and humidity measurement values, compares the temperature and humidity measurement values with temperature and humidity set values, generates air dryer operation instructions or stop instructions according to the comparison result, and controls the start or stop of the air dryer.

[0009] Further, the temperature and humidity set values include temperature and humidity set upper limit values and temperature and humidity set lower limit values; if the temperature and humidity measurement values are higher than the temperature and humidity set upper limit values, the controller generates air dryer operation instructions and sends them to the air dryer to start the air dryer to dehumidify and dry the air in the space in the outer shell; during the dehumidification and drying process, when the temperature and humidity measurement values are lower than the temperature and humidity set lower limit values, the controller generates air dryer stop instructions and sends them to the air dryer to stop the air dryer to stop dehumidifying and drying the air in the space in the outer shell.

[0010] Further, the outer shell comprises an outer shell support frame and a transparent acrylic plate; the outer shell support frame is the skeleton of the device, and the transparent acrylic plate is fixedly connected to the outer shell support frame.

[0011] Further, the outer shell support frame is made of aluminum alloy.

[0012] Further, the back of the outer shell support frame is in an arched structure.

[0013] Further, the outer shell is a left-right split mirror image structure, comprising an outer shell left split body and an outer shell right split body, and the outer shell left split body and the outer shell right split body are detachably connected through a fixing device.

[0014] Further, the fixing device is a lock structure.

[0015] Further, the box further comprises a foot support fixedly connected with the outer shell support frame, for adjusting the height and levelness of the device.

[0016] Further, the box further comprises a handle fixedly connected with the outer shell support frame, for carrying the device when installing and dismounting.

[0017] Further, the box further comprises a sealing rubber strip glued on the outer shell support frame, the structure size and height of which match the rotating shaft near the collector ring of the generator rotor, the sealing rubber strip being used for contacting the device and the generator rotor part to realize the sealing function.

[0018] The beneficial technical effect of the present application is that:

[0019] 1. The device has the characteristics of simple parts and intuitive structure, and the installation process is simple and fast.

[0020] 2. The control principle adopted by the device is easy to understand, which not only facilitates daily maintenance, but also ensures the safety and reliability of use.

[0021] 3. The device can accurately control the environmental conditions around the collector ring, effectively preventing the corrosion problem of the collector ring caused by excessive moisture in the air. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The present application provides a brush-excited generator collector ring protection device general assembly structure diagram;

[0023] Figure 2 The present application provides a brush-excited generator collector ring protection device local structure diagram;

[0024] Figure 3 The present application provides a brush-excited generator collector ring protection device control flowchart.

[0025] In the figure: 1-foot support; 2-fixing device; 3-sealing rubber strip; 4-temperature and humidity sensor; 5-air dryer; 6-outer shell support frame; 7-transparent acrylic plate; 8-handle. DETAILED DESCRIPTION

[0026] The present application will be further described in detail below in combination with the drawings and examples.

[0027] The present application provides a brush-excited generator collector ring protection device, comprising a box and a controller.

[0028] As Figures 1-2 shown, the box body includes: an outer shell, a temperature and humidity sensor 4, an air dryer 5.

[0029] The temperature and humidity sensor 4 and the air dryer 5 are installed in the outer shell. The slip ring is placed in the outer shell of the box body. The temperature and humidity sensor 4 and the air dryer 5 are respectively connected with the controller. The temperature and humidity sensor 4 is used to monitor and collect the environmental temperature and humidity data of the slip ring in the outer shell in real time, generate temperature and humidity data, and send it to the controller. The controller performs digital-to-analog conversion processing on the temperature and humidity data to generate temperature and humidity measurement values, compares the temperature and humidity measurement values with the temperature and humidity set values, generates air dryer operation instructions or stop instructions according to the comparison result, and controls the start or stop of the air dryer 5.

[0030] The temperature and humidity set value includes a temperature and humidity set upper limit value and a temperature and humidity set lower limit value. If the temperature and humidity measurement value is higher than the temperature and humidity set upper limit value, the controller generates an air dryer operation instruction and sends it to the air dryer 5 to start the air dryer 5 to dehumidify and dry the air in the space of the outer shell. During the dehumidification and drying process, when the temperature and humidity measurement value is lower than the temperature and humidity set lower limit value, the controller generates an air dryer stop instruction and sends it to the air dryer 5 to turn off the air dryer 5 and stop dehumidifying and drying the air in the space of the outer shell.

[0031] The outer shell includes an outer shell support frame 6 and a transparent acrylic plate 7. The outer shell support frame 6 is the skeleton of the device, which is made of aluminum alloy, light in weight and not easy to rust, facilitating installation and maintenance. The transparent acrylic plate 7 is fixedly connected to the outer shell support frame 6 by rivets, which can meet the observation demand of the slip ring and prevent external air from entering the outer shell.

[0032] In a specific embodiment, the back of the outer shell support frame 6 is in an arc shape. When installed with a brush-excited generator, the arc-shaped structure is embedded in the gap between the brush holder and the cooler of the generator.

[0033] In a specific embodiment, the box body is a left-right split mirror image structure. Specifically, the outer shell is a left-right split mirror image structure, including an outer shell left split body and an outer shell right split body, which are detachably connected by a fixing device 2. The fixing device 2 adopts a lock structure, which can fix the left and right split bodies of the outer shell without using bolts and nuts, reducing the risk of foreign matter, and also facilitating opening during maintenance.

[0034] As Figures 1-2 shown, the box body further includes a foot support 1, a handle 8, and a sealing rubber strip 3.

[0035] The foot support 1 is fixedly connected with the outer shell support frame 6 through bolts, and is used for adjusting the height and levelness of the device; the bolts can be rotated to adjust the height of the device, and the levelness of the device can be adjusted at the same time, so that the stable installation of the device is ensured.

[0036] The handle 8 is welded on the outer shell support frame 6, and is used for carrying the device during installation and disassembly.

[0037] The sealing rubber strip 3 is glued on the outer shell support frame 6, and the structure size and height of the sealing rubber strip 3 are matched with the rotating shaft of the generator rotor near the collector ring; the sealing rubber strip 3 is used for contacting the device and the generator rotor part, so that the sealing function is realized.

[0038] When the device is used for protecting the collector ring of the brush-excited generator, two boxes are adopted, and the two boxes are of the same structure and are left-right split mirror image structures. The box of the device is installed on the brush holder base frame, and the two boxes correspond to the positive electrode and the negative electrode of the generator collector ring respectively; the two boxes are of the left-right split mirror image structures, so that the installation and disassembly from the two sides of the collector ring are facilitated, and the installation workload is saved. After the device is installed, the two collector rings of the generator are arranged in the boxes and are in a relatively sealed environment, so that the collector rings are prevented from being directly exposed to air.

[0039] The core working principle of the device is to control the humidity level of the air around the collector ring to reduce the probability of rusting of the collector ring caused by environmental factors.

[0040] Based on the analysis of the chemical process of rusting of steel, oxygen and water are the key factors for rusting of steel. The device can accurately capture the temperature and humidity data around the collector ring in real time through the built-in temperature and humidity sensor, and convert the analog signal to digital signal through the controller, so that the real-time temperature and humidity measurement value is obtained through effective processing of the temperature and humidity data; and the real-time temperature and humidity measurement value is compared with the preset temperature and humidity setting value. Once it is detected that the real-time temperature and humidity measurement value of the environmental humidity exceeds the safety range of the preset upper limit value of the temperature and humidity setting value, the controller will automatically activate the air dryer to implement heating and drying treatment on the area around the collector ring, so as to reduce the water content in the air. During the processing, when it is detected that the real-time temperature and humidity measurement value of the environmental humidity is lower than the preset lower limit value of the temperature and humidity setting value, the controller will automatically stop the air dryer to stop the heating and drying treatment on the area around the collector ring.

[0041] In addition, the device of the application wraps the collector ring and the carbon brush holder of the generator as a whole through the outer shell, so as to form a relatively closed protection environment for the collector ring, and effectively block the erosion of water in the external air to the collector ring.

[0042] The critical relative humidity of steel is about 70%, but when the air is polluted or the metal surface is unclean, this value decreases, that is, at a lower relative humidity, the metal will corrode quickly. When the relative humidity is lower than the critical humidity, or lower than 65%, the metal hardly corrodes regardless of the temperature.

[0043] In a specific embodiment, the upper limit of the temperature and humidity is set to 65%, and the lower limit of the temperature and humidity is set to 40%; through real-time collection of the temperature and humidity data of the environment around the collector ring by the temperature and humidity sensor 4, and real-time comparison and judgment by the controller, the start or stop of the air dryer 5 is controlled. When the temperature and humidity sensor 4 collects the surrounding humidity data greater than 65%, the air dryer 5 is started to dehumidify by the controller; when the temperature and humidity sensor 4 collects the surrounding humidity data lower than 40%, the air dryer 5 is stopped to dehumidify by the controller; when the temperature and humidity sensor 4 collects the surrounding humidity data greater than 65%, the air dryer 5 is started to dehumidify again by the controller, and so on, the control process is as shown in Figure 3

[0044] The above describes the present application in detail in combination with the drawings and examples, but the present application is not limited to the above examples, and various changes can be made within the knowledge possessed by those skilled in the art without departing from the purpose of the present application. The contents not described in detail in the present application can adopt the existing technology.​

Claims

1. A brush excited generator collector ring protection device, comprising: The device comprises a box body and a controller; the box body comprises an outer shell, a temperature and humidity sensor (4), and an air dryer (5); the temperature and humidity sensor (4) and the air dryer (5) are installed in the outer shell; a collector ring is arranged in the outer shell of the box body; the temperature and humidity sensor (4) and the air dryer (5) are connected with the controller; the temperature and humidity sensor (4) is used for monitoring and collecting the temperature and humidity data of the environment where the collector ring is located in the outer shell in real time, generating temperature and humidity data, and sending the temperature and humidity data to the controller; the controller performs digital-to-analog conversion processing on the temperature and humidity data, generates temperature and humidity measurement values, compares the temperature and humidity measurement values with temperature and humidity set values, judges according to the comparison result, generates an air dryer operation instruction or a stop instruction, and controls the start or stop of the air dryer (5).

2. A brush excited generator commutator guard according to claim 1 wherein, The temperature and humidity set values comprise temperature and humidity set upper limit values and temperature and humidity set lower limit values. If the temperature and humidity measurement values are higher than the temperature and humidity set upper limit values, the controller generates an air dryer operation instruction and sends the air dryer operation instruction to the air dryer (5), so as to start the air dryer (5) and dehumidify and dry the air in the space in the outer shell; during the dehumidifying and drying process, when the temperature and humidity measurement values are lower than the temperature and humidity set lower limit values, the controller generates an air dryer stop instruction and sends the air dryer stop instruction to the air dryer (5), so as to stop the air dryer (5) and stop dehumidifying and drying the air in the space in the outer shell.

3. A brush excited generator commutator guard according to claim 1 wherein, The outer shell comprises an outer shell support frame (6) and a transparent acrylic plate (7); the outer shell support frame (6) is the framework of the device, and the transparent acrylic plate (7) is fixedly connected to the outer shell support frame (6).

4. A brush excited generator commutator guard according to claim 3, characterised in that, The outer shell support frame (6) is made of aluminum alloy.

5. A brush excited generator slip ring guard as claimed in claim 3, wherein, The back of the outer shell support frame (6) is in an arched structure.

6. A brush excited generator commutator guard according to claim 1 wherein, The outer shell is in a left-right split mirror image structure, comprising an outer shell left split body and an outer shell right split body; the outer shell left split body and the outer shell right split body are detachably connected through a fixing device (2).

7. A brush excited generator commutator guard according to claim 6 wherein, The fixing device (2) is in a lock structure.

8. A brush excited generator slip ring guard as claimed in claim 3, wherein, The box body further comprises a foot support (1) fixedly connected with the outer shell support frame (6) and used for adjusting the height and levelness of the device.

9. A brush excited generator commutator guard according to claim 3 wherein, The box body further comprises a handle (8) fixedly connected to the outer shell support frame (6) and used for carrying the device during installation and disassembly.

10. A brush excited generator commutator guard according to claim 3 wherein, The box body further comprises a sealing rubber strip (3) glued to the outer shell support frame (6) and matched in structure size and height with the rotating shaft of the generator rotor near the collector ring; the sealing rubber strip (3) is used for contacting the device and the generator rotor part to realize sealing function.

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