Stator base hydrogen circulation and purification treatment system

Abstract

The invention discloses a stator base hydrogen circulation and purification treatment system, and belongs to the technical field of generator cooling, and the stator base hydrogen circulation and purification treatment system comprises a stator base body, a hydrogen circulation module, a purification treatment module, a pressure regulation module and a monitoring control module, a hydrogen accommodating cavity is formed in the stator base body I and the cooling disc; a hydrogen outlet and a hydrogen inlet are formed in the side wall of the cooling disc; according to the hydrogen circulation and purification treatment system for the stator base, the annular hydrogen circulation channel is defined by the outer ring body and the inner ring body, and the supporting blocks are matched to limit the gas outlet direction, so that hydrogen can directionally flow along a fixed path, the phenomenon of disordered running of the hydrogen is avoided, and sufficient contact between the hydrogen and a stator iron core is ensured; meanwhile, the necking structure of the conical ventilation opening can increase the flow velocity of hydrogen, the problem of flow velocity attenuation is solved, and the heat exchange effect is further enhanced.

Description

Technical Field

[0001] This invention belongs to the field of generator cooling technology, specifically relating to a stator frame hydrogen circulation and purification system. Background Technology

[0002] During the operation of large motors, the stator core generates a large amount of heat due to electromagnetic induction. If the heat cannot be dissipated in time, the internal temperature of the motor will rise, affecting the motor's operating efficiency and service life. Hydrogen, due to its excellent thermal conductivity, is often used as a cooling medium for large motors. Through the circulation of hydrogen inside the motor, efficient cooling of the stator core is achieved.

[0003] In existing hydrogen cooling systems for stator frames, the flow path of hydrogen within the frame is mostly disordered diffusion, which easily leads to hydrogen erratic movement, resulting in uneven contact between hydrogen and the stator core and low cooling efficiency. At the same time, during the circulation process, the flow velocity of hydrogen gradually decreases as the flow distance increases, further weakening the cooling effect. Summary of the Invention

[0004] The purpose of this invention is to provide a hydrogen circulation and purification system for stator frames, in order to solve the problems that the hydrogen flow path inside the frame is mostly disordered diffusion, which easily leads to hydrogen erratic movement, resulting in uneven contact between hydrogen and stator core and low cooling efficiency. At the same time, the flow velocity of hydrogen gradually decreases as the flow distance increases during circulation, further weakening the cooling effect.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a stator frame hydrogen circulation and purification system, comprising a stator frame body, a hydrogen circulation module, a purification module, a pressure regulation module, and a monitoring and control module. A cooling plate is connected to one side of the stator frame body. A hydrogen receiving cavity is provided inside the stator frame body and the cooling plate. A hydrogen outlet and a hydrogen inlet are provided on the side wall of the cooling plate. The hydrogen outlet is connected to the hydrogen circulation module and the purification module. An outer ring is fixedly connected inside the cooling plate. Multiple gas passing components are fixedly connected to the inner wall of the outer ring. An inner ring is fixedly connected to the inner wall of the multiple gas passing components. The outer ring and the inner ring have an annular hydrogen flow channel.

[0006] In a preferred embodiment, the outer ring body has a gas cavity inside, the hydrogen inlet is connected to the gas cavity, a support block is fixedly connected between the outer ring body and the inner ring body, a gas outlet is opened on one side of the support block, the gas outlet is connected to the gas cavity, one end of the hydrogen outlet is connected to the hydrogen flow channel, and the hydrogen outlet is located on the side of the support block away from the gas outlet. The stator frame body has a cooling plate connected to one side and a rotating shaft rotatably connected inside. The rotating shaft extends out of the stator frame body and has fan blades on the outer side of the extended end.

[0007] In a preferred embodiment, the gas passing component includes a fixing block, which is fixedly connected between the outer ring body and the inner ring body. A gas vent is provided in the middle of the fixing block, and the diameter of the gas vent on the side closer to the hydrogen inlet is larger than the diameter on the other side.

[0008] In a preferred embodiment, a stator core is provided inside the stator frame body, and the hydrogen flow channel corresponds to the position of the stator core.

[0009] In a preferred embodiment, the purification module includes a purification chamber, and a front frame, an electric heating element, and a filter assembly are respectively arranged along the length of the purification chamber. A rotating block is rotatably connected inside the front frame. An air inlet is provided inside the purification box on the side near the front frame. A servo motor is fixedly connected to one side of the front frame. The drive shaft of the servo motor is fixedly connected to one end of the rotating block.

[0010] In a preferred embodiment, the purification chamber has a hydrogen outlet located on the side near the filter assembly inside.

[0011] In a preferred embodiment, the hydrogen circulation module includes a circulation fan, an inlet pipe, and a return pipe. The inlet of the circulation fan is connected to the hydrogen outlet through the return pipe, and the outlet of the circulation fan is connected to the purification chamber through the inlet pipe.

[0012] In a preferred embodiment, the pressure regulating module includes a gas supply branch, an exhaust branch, and a pressure sensor. One end of the gas supply branch is connected to an external hydrogen source, and the other end is connected to the intake pipe. One end of the exhaust branch is connected to the return gas pipe, and the other end is connected to an external exhaust gas treatment device. Both the gas supply branch and the exhaust branch are equipped with electromagnetic regulating valves, and the pressure sensor is installed inside the hydrogen storage cavity.

[0013] In a preferred embodiment, the monitoring and control module includes a controller and a hydrogen purity sensor, a humidity sensor, and a temperature sensor, which are electrically connected to the controller respectively. The hydrogen purity sensor, humidity sensor, and temperature sensor all extend into the hydrogen containment cavity. The controller is also electrically connected to the circulating fan and the electromagnetic regulating valve.

[0014] In a preferred embodiment, control valves are provided on both the hydrogen outlet and the hydrogen inlet.

[0015] Compared with the prior art, the beneficial effects of the present invention are: The stator frame hydrogen circulation and purification system forms an annular hydrogen flow channel through the enclosed outer and inner rings. Combined with the support block restricting the gas outlet direction, this allows the hydrogen to flow directionally along a fixed path, preventing random hydrogen flow and ensuring full contact between the hydrogen and the stator core. At the same time, the conical vent's narrowing structure increases the hydrogen flow rate, compensating for the flow rate attenuation problem and further enhancing the heat exchange effect.

[0016] The stator frame hydrogen circulation and purification system has an outer ring body and an inner ring body connected and fixed by multiple gas passing components and support blocks to form a stable frame structure that can withstand hydrogen pressure and vibration during motor operation, preventing structural deformation from affecting sealing performance. At the same time, the staggered setting of hydrogen inlet and outlet and the configuration of control valves facilitate system maintenance and troubleshooting, improving the reliability of system operation.

[0017] The stator frame hydrogen circulation and purification system adopts a "flow regulation-heating-multi-stage filtration" structural design. The electric heating tube reduces the relative humidity of the hydrogen, and the multi-stage filtration of the filter assembly can effectively remove oil, impurities and moisture from the hydrogen, keeping the hydrogen purity stable and avoiding wear of internal motor components by impurities and reduced cooling performance caused by decreased hydrogen purity.

[0018] The stator frame hydrogen circulation and purification system uses a monitoring and control module to collect hydrogen status data in real time through multiple sensors. This enables automatic control of components such as the circulating fan, electromagnetic regulating valve, and servo motor. The system can dynamically adjust the hydrogen flow rate, pressure, and purification intensity based on the heating status of the stator core and the hydrogen status. This ensures cooling while reducing energy consumption, achieving highly efficient and energy-saving operation of the system. Attached Figure Description

[0019] Figure 1 This is a front view of the hydrogen circulation and purification system for the stator frame of the present invention. Figure 2 This is a front view of the inner ring body and support block structure of the present invention; Figure 3 This is a front view of the stator core and control valve structure of the present invention; Figure 4 This is a front view of the filter assembly and outlet structure of the present invention.

[0020] In the diagram: 1. Shaft; 2. Fan blade; 3. Stator base body; 4. Cooling plate; 5. Hydrogen inlet; 6. Purification chamber; 7. Inner ring; 8. Support block; 9. Fixing block; 10. Vent; 11. Outer ring; 12. Stator core; 13. Control valve; 14. Front frame; 15. Air inlet; 16. Rotating block; 17. Electric heating element; 18. Filter assembly; 19. Exit; 20. Hydrogen outlet; 21. Circulating fan. Detailed Implementation

[0021] The present invention will be further described below with reference to embodiments.

[0022] The following embodiments are used to illustrate the present invention, but should not be used to limit the scope of protection of the present invention. The conditions in the embodiments can be further adjusted according to specific conditions, and simple improvements to the method of the present invention under the premise of the concept of the present invention are all within the scope of protection claimed by the present invention.

[0023] Please see Figures 1-4 The present invention provides a stator frame hydrogen circulation and purification system, including a stator frame body 3, a hydrogen circulation module, a purification module, a pressure regulation module and a monitoring and control module. A cooling plate 4 is connected to one side of the stator frame body 3. A hydrogen storage cavity is provided inside the stator frame body 3 and the cooling plate 4, which provides space for the storage and circulation of hydrogen.

[0024] The stator frame body 3 is made of Q345R low alloy high strength steel welded together. The inner wall is shot blasted and then coated with a nickel-based anti-hydrogen permeation coating. The coating bonding strength is not less than 50MPa through cross-cut test, which effectively prevents hydrogen permeation.

[0025] The cooling plate 4 has a hydrogen outlet 20 and a hydrogen inlet 5 on its side wall. The hydrogen outlet 20 is connected to the hydrogen circulation module and the purification module. Both the hydrogen outlet 20 and the hydrogen inlet 5 are equipped with control valves 13. The hydrogen circulation module includes a circulation fan 21, an inlet pipe and a return pipe. The inlet of the circulation fan 21 is connected to the hydrogen outlet 20 through the return pipe, and the outlet of the circulation fan 21 is connected to the purification chamber 6 through the inlet pipe.

[0026] The hydrogen circulation module includes a circulation fan 21, an inlet pipe, and a return pipe. The circulation fan 21 is an explosion-proof centrifugal fan to ensure safe operation in a hydrogen environment.

[0027] The inlet of the circulating fan 21 is sealed to the hydrogen outlet 20 through the return gas pipeline, and the outlet of the circulating fan 21 is sealed to the hydrogen inlet 5 through the inlet gas pipeline, forming a closed-loop circulation path in which hydrogen flows out from the cooling plate 4, is processed, and then flows back.

[0028] Specifically, the circulating fan 21 of the hydrogen circulation module is an explosion-proof centrifugal fan of model 9-19-5A, with an explosion-proof rating of ExdⅡBT4, a flow rate of 1200m³ / h, a total pressure of 15kPa, and a motor power of 5.5kW. The fan inlet and return gas pipeline are connected by flanges, with an oil-resistant asbestos rubber gasket sandwiched between the flanges. Both the inlet and return gas pipelines are made of DN100 seamless steel pipes. The bends in the pipelines use elbows with a curvature radius of 300mm to reduce airflow resistance. The outer wall of the pipeline is wrapped with a 50mm thick aluminum silicate cotton insulation layer, and the outer layer is wrapped with fiberglass cloth and coated with fireproof paint to prevent condensation on the outer wall of the pipeline.

[0029] The cooling plate 4 is fixedly connected to an outer ring body 11. Multiple gas passing components are fixedly connected to the inner wall of the outer ring body 11. An inner ring body 7 is fixedly connected to the inner wall of the multiple gas passing components. The outer ring body 11 and the inner ring body 7 have an annular hydrogen flow channel.

[0030] The hydrogen flow channel corresponds to the position of the stator core 12 inside the stator frame body 3, so that the hydrogen can be precisely applied to the stator core 12 for cooling.

[0031] An air chamber is provided inside the outer ring body 11. The hydrogen inlet 5 is connected to the air chamber. A support block 8 is fixedly connected between the outer ring body 11 and the inner ring body 7. An air outlet is provided on one side of the support block 8. The air outlet is connected to the air chamber. One end of the hydrogen outlet 20 is connected to the hydrogen flow channel. The hydrogen outlet 20 is located on the side of the support block 8 away from the air outlet. Hydrogen inlet 5 is connected to the gas chamber through a preset channel inside the cooling plate 4, thereby enabling the delivery of hydrogen to the gas chamber.

[0032] The stator frame body 3 has a cooling plate 4 connected to one side, and a rotating shaft 1 is rotatably connected inside. The rotating shaft 1 extends out of the stator frame body 3, and a fan blade 2 is provided on the outer side of the extended end.

[0033] The gas passage component includes a fixing block 9, which is fixedly connected between the outer ring body 11 and the inner ring body 7. A gas vent 10 is provided in the middle of the fixing block 9, and the diameter of the gas vent 10 on the side closer to the hydrogen inlet 5 is larger than the diameter on the other side.

[0034] The vent 10 has a conical structure, with the diameter of the side closer to the hydrogen inlet 5 being larger than the diameter of the side farther from the hydrogen inlet 5, forming a constricted flow structure.

[0035] The stator frame body 3 is equipped with a stator core 12, and the hydrogen flow channel corresponds to the position of the stator core 12.

[0036] The purification module includes a purification chamber 6. Inside the purification chamber 6, along the length direction, there are a front frame 14, an electric heating tube 17, and a filter assembly 18. A rotating block 16 is rotatably connected inside the front frame 14. An air inlet 15 is opened on the side of the purification chamber 6 near the front frame 14. A servo motor is fixedly connected to one side of the front frame 14. The drive shaft of the servo motor is fixedly connected to one end of the rotating block 16.

[0037] A servo motor drives the rotating block 16 to rotate within the front frame 14, thereby adjusting the airflow. Electric heating tubes 17 are evenly distributed along the length of the purification chamber 6 to heat the hydrogen entering the chamber, reducing its relative humidity and facilitating subsequent moisture removal. The filter assembly 18 comprises a pre-filter, an activated carbon filter, and a high-precision metal filter stacked sequentially. The pre-filter removes large particles, the activated carbon filter adsorbs oil and odors, and the high-precision metal filter (filtration accuracy 0.1-0.5μm) removes fine particles. An outlet 19 is located inside the purification chamber 6 near the filter assembly 18, connected to the inlet of the circulating fan 21, allowing the purified hydrogen to recirculate within the fan.

[0038] The purification chamber 6 has a hydrogen outlet 19 located on the side near the filter assembly 18 inside.

[0039] The pressure regulation module includes a gas supply branch, an exhaust branch, and a pressure sensor. One end of the gas supply branch is connected to an external hydrogen source, and the other end is connected to the intake pipe. One end of the exhaust branch is connected to the return gas pipe, and the other end is connected to an external exhaust gas treatment device. Both the gas supply branch and the exhaust branch are equipped with electromagnetic regulating valves. The pressure sensor is installed inside the hydrogen storage chamber.

[0040] Specifically, the solenoid regulating valve for the air supply branch of the pressure regulating module is an explosion-proof solenoid valve of model ZQDF-16C, with a nominal diameter of DN25, a working pressure of 0-1.6MPa, and a response time of ≤0.5s; the solenoid regulating valve for the exhaust branch is of the same model, but a throttle valve is connected in series at its outlet end to control the exhaust speed.

[0041] The pressure sensor is a PT124G-111 diffused silicon pressure sensor with a measurement range of 0-1MPa and an accuracy of 0.25. The sensor probe is installed on the side wall of the cooling plate 4 through an M20×1.5 threaded interface, and the interface is sealed with PTFE sealing tape.

[0042] Specifically, the monitoring and control module uses a Siemens S7-200 SMART PLC, model ST40, equipped with an EMAE08 analog input module and an EMA AQ04 analog output module, achieving 8 analog inputs and 4 analog outputs. The hydrogen purity sensor is an H2-800 thermal conductivity hydrogen analyzer, with a measurement range of 0-100%, accuracy ±0.1%, and response time ≤5s; the humidity sensor is an SHT30 digital temperature and humidity sensor, with a humidity measurement range of 0-100%RH and accuracy ±2%RH; the temperature sensor is a PT100 platinum resistance thermometer, with a measurement range of -20-150℃ and accuracy Class A.

[0043] The signals from each sensor are connected to the analog input module of the PLC via shielded cables. The shielding layer is grounded at one end to prevent electromagnetic interference.

[0044] The controller is also connected to a touch screen to display system operating parameters (pressure, purity, humidity, temperature, flow rate, etc.) and fault alarm information in real time. It also supports manual / automatic mode switching. In manual mode, the actions of each actuator can be directly controlled through the touch screen.

[0045] The monitoring and control module includes a controller and a hydrogen purity sensor, a humidity sensor, and a temperature sensor that are electrically connected to the controller. The hydrogen purity sensor, humidity sensor, and temperature sensor all extend into the hydrogen containment chamber. The controller is also electrically connected to the circulating fan 21, the electromagnetic regulating valve, the servo motor, and the electric heating tube 17, so as to realize the automatic regulation of the operating status of each component.

[0046] Cooling hydrogen can enter the hydrogen flow channel and flow through the annular hydrogen flow channel to cool the internal stator core 12. The flowing hydrogen can pass through multiple fixed blocks 9 and enter from the larger diameter end of the vent 10, and then exit from the smaller diameter end. Because the diameter is smaller, the width through which the hydrogen passes is smaller, and the hydrogen velocity increases due to the increased pressure and speed, which is used to compensate for the problem of the hydrogen flow rate decreasing as the distance traveled increases.

[0047] Meanwhile, the design of the outer ring 11 and the inner ring 7 can concentrate hydrogen at the stator core 12, and the annular hydrogen flow channel can prevent the input hydrogen from running around randomly.

[0048] Before the system starts, the controller detects the hydrogen state in the hydrogen containment chamber using pressure sensors and hydrogen purity sensors. If the pressure is lower than the preset value, it controls the electromagnetic regulating valve on the gas replenishment branch to open and replenish hydrogen into the chamber to the preset pressure range, and then closes the gas replenishment branch.

[0049] When the circulating fan 21 starts, the hydrogen in the hydrogen receiving cavity enters the annular hydrogen flow channel from the outlet of the support block 8 under the action of the circulating fan 21. It flows directionally along the flow channel and comes into full contact with the stator core 12, absorbing the heat generated by the stator core 12. During the flow, the hydrogen passes through the conical vents 10 of each fixed block 9 in sequence. Due to the narrowing structure of the vents 10, the hydrogen flow rate is increased, effectively compensating for the flow rate attenuation caused by the increase in flow distance, and ensuring efficient heat exchange between the hydrogen and the stator core 12.

[0050] After heat exchange, the hydrogen gas, carrying heat, oil, and impurities, flows out from the hydrogen outlet 20 and enters the air inlet 15 of the purification chamber 6 via the return gas pipeline. The controller, based on the hydrogen flow rate requirement, controls the servo motor to rotate the rotating block 16, adjusting the air intake. The hydrogen then passes through the electric heating tube 17, where its relative humidity decreases due to heating. It then passes through the multi-stage filtration of the filter assembly 18 to remove oil, impurities, and some moisture, thus achieving purification.

[0051] The purified hydrogen enters the circulating fan 21 through the outlet 19. After being pressurized by the circulating fan 21, it is sent into the gas chamber of the outer ring body 11 through the inlet pipe and hydrogen inlet 5, and re-enters the hydrogen flow channel to participate in the circulation, forming a closed loop. During the circulation process, the controller receives real-time monitoring data from pressure, purity, humidity, and temperature sensors: when the pressure is higher than the preset value, it controls the solenoid regulating valve of the exhaust branch to open and release pressure.

[0052] The present invention forms an annular hydrogen flow channel by enclosing the outer ring body 11 and the inner ring body 7. With the support block 8 limiting the gas outlet direction, the hydrogen can flow in a fixed direction, avoiding the phenomenon of hydrogen running around randomly and ensuring full contact between the hydrogen and the stator core 12. At the same time, the conical vent 10 can increase the hydrogen flow rate, compensate for the flow rate attenuation problem, and further enhance the heat exchange effect.

[0053] The outer ring 11 and the inner ring 7 are connected and fixed by multiple gas passing components and support blocks 8 to form a stable frame structure that can withstand hydrogen pressure and vibration during motor operation, and avoid structural deformation affecting sealing performance. At the same time, the staggered arrangement of hydrogen inlet 5 and hydrogen outlet 20 and the configuration of control valve 13 facilitate system maintenance and troubleshooting, and improve the reliability of system operation.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stator frame hydrogen circulation and purification system, comprising a stator frame body (3), a hydrogen circulation module, a purification module, a pressure regulation module, and a monitoring and control module, characterized in that: The stator frame body (3) is connected to a cooling plate (4) on one side. The stator frame body (3) and the cooling plate (4) are provided with a hydrogen storage cavity. The cooling plate (4) has a hydrogen outlet (20) and a hydrogen inlet (5) on its side wall. The hydrogen outlet (20) is connected to the hydrogen circulation module and the purification module. The cooling plate (4) is fixedly connected to an outer ring body (11), and multiple gas passing components are fixedly connected to the inner wall of the outer ring body (11). An inner ring body (7) is fixedly connected to the inner wall of the multiple gas passing components. The outer ring body (11) and the inner ring body (7) have an annular hydrogen flow channel.

2. The stator frame hydrogen circulation and purification system according to claim 1, characterized in that: The outer ring body (11) has a gas cavity inside, the hydrogen inlet (5) is connected to the gas cavity, a support block (8) is fixedly connected between the outer ring body (11) and the inner ring body (7), an outlet is opened on one side of the support block (8), the outlet is connected to the gas cavity, one end of the hydrogen outlet (20) is connected to the hydrogen flow channel, and the hydrogen outlet (20) is located on the side of the support block (8) away from the outlet; The stator frame body (3) is connected to a cooling plate (4) on one side, and a rotating shaft (1) is rotatably connected inside. The rotating shaft (1) extends out of the stator frame body (3), and a fan blade (2) is provided on the outer side of the extended end.

3. The stator frame hydrogen circulation and purification system according to claim 1, characterized in that: The gas passing component includes a fixed block (9), which is fixedly connected between the outer ring body (11) and the inner ring body (7). A gas vent (10) is provided in the middle of the fixed block (9), and the diameter of the gas vent (10) on the side closer to the hydrogen inlet (5) is larger than the diameter on the other side.

4. The stator frame hydrogen circulation and purification system according to claim 1, characterized in that: The stator frame body (3) is provided with a stator core (12) inside, and the hydrogen flow channel corresponds to the position of the stator core (12).

5. The stator frame hydrogen circulation and purification system according to claim 1, characterized in that: The purification module includes a purification box (6), and the purification box (6) is provided with a front end frame (14), an electric heating tube (17) and a filter assembly (18) along the length direction. The front frame (14) is rotatably connected to a rotating block (16). An air inlet (15) is provided on the side of the purification box (6) near the front frame (14). A servo motor is fixedly connected to one side of the front frame (14). The drive shaft of the servo motor is fixedly connected to one end of the rotating block (16).

6. The stator frame hydrogen circulation and purification system according to claim 5, characterized in that: The purification chamber (6) has a hydrogen outlet (19) located on the side near the filter assembly (18) inside.

7. The stator frame hydrogen circulation and purification system according to claim 1, characterized in that: The hydrogen circulation module includes a circulating fan (21), an inlet pipe and a return pipe. The inlet of the circulating fan (21) is connected to the hydrogen outlet (20) through the return pipe, and the outlet of the circulating fan (21) is connected to the purification box (6) through the inlet pipe.

8. The stator frame hydrogen circulation and purification system according to claim 7, characterized in that: The pressure regulation module includes a gas supply branch, an exhaust branch, and a pressure sensor. One end of the gas supply branch is connected to an external hydrogen source, and the other end is connected to the intake pipe. One end of the exhaust branch is connected to the return gas pipe, and the other end is connected to an external exhaust gas treatment device. Both the gas supply branch and the exhaust branch are equipped with electromagnetic regulating valves. The pressure sensor is installed inside the hydrogen storage cavity.

9. The stator frame hydrogen circulation and purification system according to claim 1, characterized in that: The monitoring and control module includes a controller and a hydrogen purity sensor, a humidity sensor, and a temperature sensor that are electrically connected to the controller. The hydrogen purity sensor, humidity sensor, and temperature sensor all extend into the hydrogen containment cavity. The controller is also electrically connected to the circulating fan (21) and the electromagnetic regulating valve.

10. The stator frame hydrogen circulation and purification system according to claim 1, characterized in that: Control valves (13) are provided on both the hydrogen outlet (20) and the hydrogen inlet (5).

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