Cooling system for excitation carbon brush slip ring of large steam turbine generator
By designing a cooling system on the excitation carbon brush slip ring of a large steam turbine generator, and utilizing the cooling medium, air duct system, and PLC controller to regulate the airflow, the problem of heat dissipation difficulty of the excitation carbon brush slip ring in high-temperature environments was solved, thus achieving stable operation of the generator.
Patent Information
- Application Number
- CN202423023843.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2034-12-09
AI Technical Summary
The existing large steam turbine generator excitation carbon brush slip rings are difficult to dissipate heat effectively in high-temperature environments, leading to brush braid burnout and excitation current interruption, which affects the normal operation of the generator.
A cooling system was designed, comprising a chassis, cooling coil, air duct, infrared temperature probe, and PLC controller. The carbon brush slip ring is cooled by a cooling medium and an air duct system, and the airflow is adjusted by the PLC controller to ensure rapid heat dissipation.
It effectively improves the operating environment of carbon brush slip rings, ensures uninterrupted excitation current, avoids generator shutdown, and improves system stability and reliability.
Smart Images
Figure CN223639111U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to steam turbine generator technology field, concretely is a kind of cooling system of large steam turbine generator excitation carbon brush slip ring. BACKGROUND
[0002] The excitation current of large steam turbine generator is transmitted to the high-speed rotating rotor through carbon brush slip ring, and the heat is generated by the dynamic and static sliding friction of slip ring and carbon brush, which can cause the carbon brush to burn out under abnormal conditions, and the outer cylindrical surface of slip ring is rough and uneven, which causes the interruption of excitation current and the shutdown of generator. There is a wind wheel between the positive slip ring and the negative slip ring of the generator rotor, and the air volume is fixed. Under abnormal conditions, the heat generated by the carbon brush slip ring cannot be cooled, especially in summer, the high temperature of 50-60 degrees is generated in the workshop due to the steam turbine shell and steam pipeline of the generator, which is more detrimental to the heat dissipation of carbon brush slip ring. SUMMARY
[0003] The utility model solves the technical problems of overcoming the defects of the prior art, providing a cooling system for the excitation carbon brush slip ring of a large steam turbine generator, ensuring that the heat generated by the carbon brush slip ring under normal and abnormal conditions is quickly dissipated, improving the operating environment of the carbon brush slip ring, ensuring that the excitation current of the generator is not interrupted, and the generator does not stop, which can effectively solve the problems in the background art.
[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a cooling system for the excitation carbon brush slip ring of a large steam turbine generator, comprising a case, the carbon brush slip ring extends into the case, and the generator rotor is sealingly connected with the case; one side of the case is provided with a shell, the shell is provided with a cooling coil, the cooling coil is provided with a cooling medium, the air inlet of the case is opposite to the cooling coil, one side of the shell is provided with an air inlet pipe; the case is also provided with a wind guide tube, the wind guide tube is coaxial with the carbon brush slip ring and has a gap with the carbon brush slip ring, one end of the wind guide tube is open and corresponds to the air inlet, the other end of the wind guide tube is open and has a diameter larger than that of the generator rotor, and the wind guide tube is provided with an infrared temperature measurement probe for detecting the temperature of the carbon brush slip ring; the case is also connected with an air duct, and the air duct is provided with an air extractor.
[0005] Preferably, the utility model further comprises a PLC controller, the motor of the air extractor is controlled by a frequency converter, the infrared temperature measurement probe feeds back temperature signal to the PLC controller, and the PLC controller adjusts the rotating speed of the motor of the air extractor through the frequency converter.
[0006] Preferably, the shell is also provided with a filter assembly, the filter assembly comprises a frame, the frame is provided with a filter screen, and the shell is provided with a socket for inserting the frame.
[0007] Preferably, the generator rotor is connected with the case through a sealing bearing.
[0008] Preferably, the air duct is communicated with two air exhaust pipes, and the two air exhaust pipes are both provided with air exhaust fans.
[0009] Preferably, the outer wall of the cabinet is provided with a polyurethane heat preservation layer.
[0010] Compared with the prior art, the beneficial effects of the utility model are that: through the cabinet (the outer wall of the cabinet is provided with a polyurethane heat preservation layer), the carbon brush slip ring is isolated from the high-temperature air in the workshop; the cooling coil is used to cool the high-temperature air in the workshop, and the cooling effect of the carbon brush slip ring is enhanced after the high-temperature air is cooled; the filter assembly is used to filter the impurities and dust in the air in the workshop, and the adhesion of the impurities and dust on the carbon brush slip ring is reduced; the PLC controller is used to feedback and adjust the cooling air volume of the carbon brush slip ring, and when the temperature of the carbon brush slip ring is high, the cooling air volume is large; under the action of the air exhaust fan, the high-temperature air in the workshop cooled by the cooling coil is cooled, and the carbon brush slip ring is cooled, so that the heat generated by the carbon brush slip ring under normal and abnormal conditions is quickly dissipated, the operation environment of the carbon brush slip ring is improved, the excitation current of the generator is not interrupted, and the generator does not stop. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 It is a structural schematic view of the utility model.
[0012] In the drawing: 1 filter assembly, 2 air inlet pipe, 3 cooling coil, 4 air exhaust fan, 5 air duct, 6 sealed bearing, 7 generator rotor, 8 carbon brush slip ring, 9 infrared temperature measurement probe, 10 cabinet, 11 air duct, 12 air inlet, 13 shell. DETAILED DESCRIPTION
[0013] The utility model can be explained in detail through the following examples, and the purpose of the utility model is to protect all technical improvements within the scope of the utility model, and in the description of the utility model, it should be understood that if the directions or position relationships indicated by terms such as 'up', 'down', 'front', 'back', 'left' and 'right' are corresponding to the drawings of the application, they are only for the convenience of describing the utility model, and do not indicate or imply that the indicated devices or elements must have a specific direction.
[0014] Please refer to Figure 1The utility model provides a technical scheme: a cooling system of large -scale turbo -alternator excitation carbon brush slip ring, including the case 10, carbon brush slip ring 8 extends into the case 10, and electronic rotor 7 is sealed with the case 10 rotation cooperation, one side of the case 10 is equipped with the shell 13, is equipped with cooling coil 3 in the shell 13, and cooling coil 3 is passed into cooling medium, and the air inlet 12 of the case 10 is opposite cooling coil 3, and one side of the shell 13 is equipped with the air inlet pipe 2, the case 10 still is equipped with the air duct 11, and the air duct 11 is coaxial with carbon brush slip ring 8 and has the clearance with it, and the one end opening of the air duct 11 corresponds with the air inlet 12, and the other end opening diameter of the air duct 11 is greater than the diameter of electronic rotor 7, and the air duct 11 is equipped with infrared temperature measurement probe 9 for detecting the temperature of carbon brush slip ring 8, and the case 10 still has the air passage 5, and the air passage 5 is equipped with the exhaust fan 4,
[0015] It can be understood that the carbon brush slip ring 8 is isolated from the workshop by setting the case 10, the high-temperature air of the workshop is cooled by setting the cooling coil 3, and the cooling effect of the carbon brush slip ring is enhanced after the high-temperature air is cooled; the cold air flows along the carbon brush slip ring 8 by setting the air duct 11, and the cooling effect is better; under the action of the exhaust fan 4, the high-temperature air of the workshop cooled by the cooling coil 3 is cooled, and the carbon brush slip ring 8 is cooled, so that the heat generated by the carbon brush slip ring 8 under normal and abnormal conditions is quickly dissipated, the operating environment of the carbon brush slip ring 8 is improved, the excitation current of the generator is not interrupted, and the generator does not stop;
[0016] Further, the PLC controller is further included, the motor of the exhaust fan 4 is controlled through the frequency converter, the infrared temperature measurement probe 9 feeds back the temperature signal to the PLC controller, the PLC controller adjusts the motor speed of the exhaust fan 4 through the frequency converter, the PLC controller is adopted, the cooling air volume of the carbon brush slip ring 8 can be feedback adjusted, when the temperature of the carbon brush slip ring 8 is high, the motor speed of the exhaust fan 4 is large, and the cooling air volume is large, the motor speed of the exhaust fan 4 is adjusted by the frequency converter, which is prior art, and will not be repeated here;
[0017] Further, the shell 13 is further provided with a filter assembly 1, the filter assembly 1 comprises a frame, a filter screen is arranged in the frame, the shell 13 is provided with a socket for inserting the frame, the filter screen filters impurities and dust in the air of the workshop, reduces the adhesion of air impurities and dust on the carbon brush slip ring, and the frame is convenient to insert through the socket, so that the filter screen can be replaced or cleaned;
[0018] Further, the electronic rotor 7 is connected with the case 10 through the sealing bearing 6, so that the sealing effect is ensured, and air leakage is reduced;
[0019] Further, the air passage 5 is communicated with two exhaust pipes, and the two exhaust pipes are both provided with the exhaust fan 4, so that one is used and one is reserved, and the two exhaust fans 4 can be started at the same time, so that the air volume is increased;
[0020] In addition, the outer wall of the cabinet 10 is provided with a polyurethane heat preservation layer, so that the carbon brush slip ring 8 is isolated from the high-temperature air in the workshop.
[0021] The utility model is not limited to the details of the above exemplary embodiments, and obviously, the utility model is not limited to the details of the above exemplary embodiments for those skilled in the art, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model, therefore, no matter from which point, the embodiments should be regarded as exemplary and non-restrictive, and all changes falling within the meaning and scope of equivalent elements are included in the utility model.
Claims
1. A cooling system for an excitation carbon brush slip ring of a large turbo-generator characterized by: The application relates to a carbon brush slip ring (8) and a fan motor, which comprises a machine box (10), wherein the carbon brush slip ring (8) extends into the machine box (10), and a fan motor rotor (7) is in sealed rotary connection with the machine box (10); one side of the machine box (10) is provided with a shell (13), the shell (13) is provided with a cooling coil (3) therein, cooling medium is introduced into the cooling coil (3), an air inlet (12) of the machine box (10) is opposite to the cooling coil (3), and one side of the shell (13) is provided with an air inlet pipe (2); the machine box (10) is further provided with a wind guide cylinder (11), the wind guide cylinder (11) is coaxial with the carbon brush slip ring (8) and has a gap with the carbon brush slip ring (8), one end of the wind guide cylinder (11) is open and corresponds to the air inlet (12), the diameter of the other end of the wind guide cylinder (11) is larger than that of the fan motor rotor (7), and the wind guide cylinder (11) is provided with an infrared temperature measuring probe (9) for detecting the temperature of the carbon brush slip ring (8); the machine box (10) is further connected with an air duct (5), and the air duct (5) is provided with an air extractor (4).
2. A cooling system for an excitation carbon brush slip ring of a large turbo-generator according to claim 1, characterized in that: The application further comprises a PLC controller, the motor of the air extractor (4) is controlled through a frequency converter, the infrared temperature measuring probe (9) feeds back a temperature signal to the PLC controller, and the PLC controller adjusts the rotating speed of the motor of the air extractor (4) through the frequency converter.
3. A cooling system for an excitation carbon brush slip ring of a large turbo-generator according to claim 1, characterized in that: The shell (13) is further provided with a filter assembly (1), the filter assembly (1) comprises a frame, the frame is provided with a filter screen, and the shell (13) is provided with a socket for inserting the frame.
4. A cooling system for an excitation carbon brush slip ring of a large turbo-generator according to claim 1, characterized in that: The fan motor rotor (7) is connected with the machine box (10) through a sealing bearing (6).
5. A cooling system for an excitation carbon brush slip ring of a large turbo-generator according to claim 1, characterized in that: The air duct (5) is connected with two air extraction pipes, and the two air extraction pipes are both provided with the air extractor (4).
6. A cooling system for an excitation carbon brush slip ring of a large turbo-generator according to claim 1, characterized in that: The outer wall of the machine box (10) is provided with a polyurethane heat preservation layer.