High-speed suspension centrifugal fan based on magnetic field modulation

Abstract

The invention discloses a high-speed suspension centrifugal fan based on magnetic field modulation, which comprises an impeller shaft, a modulation ring, a low-speed permanent magnet ring, a high-speed permanent magnet ring and a first impeller, a hybrid magnetic bearing and a first bearing are fixedly connected between the inner wall of the magnetic bearing seat and the impeller shaft, the modulation ring is coaxially arranged at the end, away from the magnetic bearing seat, of the impeller shaft, a plurality of air inlets are formed in the modulation ring, the low-speed permanent magnet ring is directly connected with a motor driving shaft, and the modulation ring is coaxially sleeved with the low-speed permanent magnet ring. The high-speed permanent magnet ring is fixedly connected to the other end of the impeller shaft, the low-speed permanent magnet ring is in magnetic connection with the high-speed permanent magnet ring, the first impeller is fixedly connected between the magnetic bearing seat and the modulation ring, and blades in the first impeller are fixedly connected with the impeller shaft. According to the technical scheme, the energy utilization efficiency of the equipment is improved, and the operation efficiency and reliability are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of high-speed suspended centrifugal fans, and in particular to a high-speed suspended centrifugal fan based on magnetic field modulation. Background Art

[0002] Existing high-speed centrifugal fans primarily include magnetic levitation centrifugal fans and mechanical gear-speed centrifugal fans. The advantage of magnetic levitation centrifugal fans lies in their direct connection between the impeller and the motor, eliminating the traditional mechanical gear-speed-increasing system, reducing gear transmission losses, and eliminating the need for an oil lubrication system. However, as fans increase their motor speed and power requirements, existing high-speed motors struggle to simultaneously meet both high speed and high power requirements and cannot operate at their optimal fluid performance operating point. Furthermore, the non-contact seals of magnetic levitation centrifugal fans struggle to achieve a good sealing effect. Enhancing the sealing effect would increase the axial length, reduce the critical speed of the rotor, and increase design complexity. Magnetic levitation high-speed motors are relatively expensive, typically more than five times that of traditional motors. Mechanical gear-speed centrifugal fans rely on mechanical transmission gears to match the speed of the motor to the high-speed impeller and require an oil lubrication system. Due to the high mechanical losses in the gear transmission, they are prone to wear over time, making maintenance cumbersome and frequent. Summary of the Invention

[0003] The main purpose of the present invention is to provide a high-speed suspended centrifugal fan based on magnetic field modulation, aiming to improve the energy utilization efficiency of the equipment and improve the operating efficiency and reliability.

[0004] To achieve the above objectives, the present invention proposes a high-speed suspended centrifugal fan based on magnetic field modulation, comprising:

[0005] An impeller shaft, wherein a magnetic bearing seat is coaxially connected to the impeller shaft, and a hybrid magnetic bearing and a first bearing are fixedly connected between an inner wall of the magnetic bearing seat and the impeller shaft;

[0006] A modulation ring is coaxially arranged at an end of the impeller shaft away from the magnetic bearing seat, and a plurality of air inlets are opened on the modulation ring;

[0007] A low-speed permanent magnet ring, which is directly connected to the motor drive shaft and is coaxially sleeved on the outside of the modulation ring;

[0008] A high-speed permanent magnet ring, wherein the high-speed permanent magnet ring is fixedly connected to the other end of the impeller shaft, and the low-speed permanent magnet ring is magnetically connected to the high-speed permanent magnet ring;

[0009] The first impeller is fixedly connected between the magnetic bearing seat and the modulation ring, and the inner blades of the first impeller are fixedly connected to the impeller shaft.

[0010] In a possible embodiment, the magnetic bearing seat is fixedly connected to a second impeller at one end away from the first impeller, the inner blades of the second impeller are fixedly connected to the impeller shaft, and an intercooler is connected between the first impeller air outlet and the second impeller air inlet.

[0011] In a possible implementation manner, the first impeller and the second impeller are arranged back to back.

[0012] In a possible implementation manner, a plurality of gap slots are provided on the modulation ring.

[0013] In a possible implementation, a sealing ring is fixedly connected to the connection between the magnetic bearing seat and the first impeller or the second impeller.

[0014] In a possible implementation, a third bearing is fixedly connected between the impeller shaft and the modulation ring.

[0015] In a possible embodiment, an air filter is detachably fixedly connected to the inner wall of each air inlet.

[0016] The technical solution of the present invention uses a hybrid magnetic bearing to avoid the oil lubrication and friction problems in traditional mechanical bearings when the first impeller is running at high speed. This frictionless operation characteristic greatly reduces energy loss, improves operating efficiency and reliability, and avoids the pollution problems caused by traditional lubricating oil. This is especially important for equipment that needs to operate efficiently for a long time, and can significantly improve the overall efficiency of the system. The low-speed permanent magnet ring and the high-speed permanent magnet ring are connected by magnetic force, which not only realizes the physical decoupling between the motor and the centrifugal impeller, but also effectively transmits the rotation speed of the low-speed motor to the high-speed centrifugal impeller through magnetic force. Specifically, the low-speed motor can drive the low-speed permanent magnet ring, thereby transmitting the driving force to the high-speed permanent magnet ring through magnetic force, pushing the first impeller to rotate, avoiding the bearing friction and complex structure in the traditional mechanical transmission method. In addition, the overall energy utilization efficiency of the equipment is improved, and the oil-free and friction-free operation and the contactless support of the magnetic bearing improve the stability and reliability of the equipment, reducing the failure rate and downtime. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 the structures shown in these drawings without paying any creative work.

[0018] Figure 1 A schematic diagram of a high-speed suspended centrifugal fan based on magnetic field modulation in the present invention Figure 1 ;

[0019] Figure 2 This is a schematic diagram of a high-speed suspended centrifugal fan based on magnetic field modulation in the present invention. Figure 1 ;

[0020] Figure 3 This is a schematic diagram of a high-speed suspended centrifugal fan based on magnetic field modulation in the present invention. Figure 2 ;

[0021] Figure 4 for Figure 3 A is an enlarged schematic diagram.

[0022] Description of Figure Numbers:

[0023] 11. Impeller shaft; 12. Magnetic bearing seat; 13. Hybrid magnetic bearing; 14. First bearing; 15. Modulation ring; 151. Air inlet; 152. Gap slot; 153. Third bearing; 16. Low-speed permanent magnet ring; 17. High-speed permanent magnet ring; 18. First impeller; 19. Air filter; 21. Second impeller; 22. Sealing ring.

[0024] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0026] The present invention provides a high-speed suspended centrifugal fan based on magnetic field modulation.

[0027] Reference Figures 1 to 4 , including an impeller shaft 11, a modulation ring 15, a low-speed permanent magnet ring 16, a high-speed permanent magnet ring 17 and a first impeller 18:

[0028] The impeller shaft 11 is coaxially connected to the magnetic bearing seat 12, the hybrid magnetic bearing 13 and the first bearing 14 are fixedly connected between the inner wall of the magnetic bearing seat 12 and the impeller shaft 11, the modulation ring 15 is coaxially arranged at the end of the impeller shaft 11 away from the magnetic bearing seat 12, and a plurality of air inlets 151 are opened on the modulation ring 15, the low-speed permanent magnet ring 16 is directly connected to the motor drive shaft, the low-speed permanent magnet ring 16 is coaxially sleeved on the outside of the modulation ring 15, the high-speed permanent magnet ring 17 is fixedly connected to the other end of the impeller shaft 11, the low-speed permanent magnet ring 16 is magnetically connected to the high-speed permanent magnet ring 17, the first impeller 18 is fixedly connected between the magnetic bearing seat 12 and the modulation ring 15, and the inner blades of the first impeller 18 are fixedly connected to the impeller shaft 11;

[0029] The core function of the hybrid magnetic bearing 13 is to achieve frictionless support of the impeller shaft 11 by the bearing through magnetic force, so that the first impeller 18 avoids the oil lubrication and friction problems in traditional mechanical bearings when running at high speed. This frictionless operation characteristic greatly reduces energy loss, improves operating efficiency and reliability, and avoids the pollution problems caused by traditional lubricants. This is particularly important for equipment that needs to operate efficiently for a long time, and can significantly improve the overall efficiency of the system. The low-speed permanent magnet ring 16 and the high-speed permanent magnet ring 17 are connected by magnetic force, which not only achieves physical decoupling between the motor and the centrifugal impeller, but also effectively transmits the speed of the low-speed motor to the high-speed centrifugal impeller through magnetic force. Specifically, the low-speed motor can drive the low-speed permanent magnet ring 16, thereby transmitting the driving force to the high-speed permanent magnet ring 17 through magnetic force, pushing the first impeller 18 to rotate, avoiding the bearing friction and complex structure in traditional mechanical transmission methods. This improves the overall energy utilization efficiency of the equipment, and the oil-free and frictionless operation and contactless support of the magnetic bearing improve the stability and reliability of the equipment, reducing the failure rate and downtime. Furthermore, the first bearing 14 further ensures the safety and reliability of the wind turbine under various operating conditions. When the wind turbine is stopped, the hybrid magnetic bearing 13 no longer outputs magnetic force to the impeller shaft 11. At this point, the first bearing 14 acts as a support, providing the necessary support for the impeller shaft 11 and preventing uneven force or deformation. This ensures that the system will not be damaged by loose impeller shaft 11 during commissioning or shutdown. This not only improves the safety of the equipment but also effectively protects the life of the hybrid magnetic bearing 13, enabling it to maintain stable performance during startup and shutdown.

[0030] Reference Figure 2 , the magnetic bearing seat 12 is fixedly connected to the second impeller 21 at one end away from the first impeller 18, the inner blades of the second impeller 21 are fixedly connected to the impeller shaft 11, and an intercooler is connected between the air outlet of the first impeller 18 and the air inlet of the second impeller 21;

[0031] By increasing the second impeller 21, the intercooler is connected between the outlet of the first impeller 18 and the inlet of the second impeller 21. The temperature of the gas after high-speed rotation at the outlet of the first impeller 18 is usually high. By setting the intercooler, the gas can be rapidly cooled after passing through the first impeller, reducing the temperature of the gas. This helps to reduce the thermal expansion and heat loss that high-temperature gas may bring to the subsequent impeller (second impeller 21), ensuring that the subsequent impeller can operate at a more stable temperature. With the decrease of the temperature of the gas, the density of the gas will increase. The role of the intercooler is to reduce the temperature of the gas, thereby increasing the density of the fluid. This can improve the aerodynamic performance of the fan, so that the gas can more effectively transfer energy when passing through the second impeller 21, improving the overall efficiency of the fan. In addition, the gas flow after passing through the first impeller 18 may bring a larger expansion pressure due to the high temperature, increasing the axial load of the system. By increasing the intercooler to reduce the temperature of the gas flow, the axial load caused by the expansion of the gas flow can be reduced, thereby effectively reducing the burden on the bearing, reducing mechanical wear and tear, and improving the service life of the overall fan.

[0032] With reference to Figure 2 , the first impeller 18 and the second impeller 21 are arranged back-to-back;

[0033] Due to the working principle of the fan, the impeller blades will be subjected to forces from the fluid, especially the pushing force of the gas flow. These forces will usually generate an axial load, causing the impeller bearing to bear additional pressure. If the axial load is too large, it may cause the bearing to wear out more quickly, or even cause the bearing to be damaged. In the present application, the first impeller 18 and the second impeller 21 are arranged back-to-back, and the two back-to-back arranged impellers will be subjected to forces from the fluid, the directions of these forces being opposite, thus effectively canceling the axial load. In this way, the axial force of the impeller system is balanced, thereby reducing the burden on the bearing, reducing axial vibration and friction loss, avoiding the strong axial load brought by a single impeller, thereby prolonging the service life of the bearing and reducing the maintenance pressure.

[0034] With reference to Figures 3 to 4 , a plurality of gap grooves 152 are formed on the modulation ring 15;

[0035] By providing a plurality of gap grooves 152, the magnetic force connection between the low-speed permanent magnet ring 16 and the high-speed permanent magnet ring 17 is more stable, the interference of the modulation ring 15 on the magnetic force is reduced, the magnetic force control is improved, and the low-speed permanent magnet ring 16 directly connected to the motor can drive the impeller shaft 11 with the high-speed permanent magnet ring 17 to rotate quickly and stably. The speed of the motor and the impeller shaft 11 is decoupled by the magnetic force connection between the low-speed permanent magnet ring 16 and the high-speed permanent magnet ring 17, so that a low-speed ordinary motor can drive a high-speed centrifugal impeller.

[0036] With reference to Figures 2 to 3, each sealing ring 22 is fixedly connected to the connection between the magnetic bearing seat 12 and the first impeller 18 or the second impeller 21;

[0037] By setting the sealing ring 22, the fluid channels in the first impeller 18 and the second impeller 21 are completely independent, and leakage will only occur inside the fluid without affecting the outside of the equipment. At the same time, when workers troubleshoot equipment failures, they can more quickly identify the root cause of the problem and thus quickly resolve it.

[0038] Reference Figures 3 to 4 , the third bearing 153 is fixedly connected between the impeller shaft 11 and the modulation ring 15;

[0039] The third bearing 153 is used to protect the connection between the impeller shaft 11 and the modulation ring 15, and the third bearing 153 is set to a relatively outer side, so that the third bearing 153 can be replaced by simply removing the modulation ring 15, which makes it convenient for workers to replace standard components and reduces replacement and maintenance costs.

[0040] Reference Figures 3 to 4 , the air filter 19 is detachably fixedly connected to the inner wall of the air inlet 151;

[0041] The air filter 19 is preferably threadedly connected to the inner wall of the air inlet 151. By adding the air filter 19, the wind entering the first impeller 18 is filtered, reducing the impact of dust on the first impeller 18 and improving the overall stability of the equipment.

[0042] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0043] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A high-speed suspended centrifugal fan based on magnetic field modulation, characterized in that: include: impeller A shaft (11), a magnetic bearing seat (12) is coaxially connected to the impeller shaft (11), and a hybrid magnetic bearing (13) and a first bearing (14) are fixedly connected between the inner wall of the magnetic bearing seat (12) and the impeller shaft (11); A modulation ring (15), the modulation ring (15) being coaxially arranged at one end of the impeller shaft (11) away from the magnetic bearing seat (12), and having a plurality of air inlets (151) formed on the modulation ring (15); A low-speed permanent magnet ring (16), wherein the low-speed permanent magnet ring (16) is directly connected to the motor drive shaft, and the low-speed permanent magnet ring (16) is coaxially sleeved on the outside of the modulation ring (15); A high-speed permanent magnet ring (17), wherein the high-speed permanent magnet ring (17) is fixedly connected to the other end of the impeller shaft (11), and the low-speed permanent magnet ring (16) is magnetically connected to the high-speed permanent magnet ring (17); A first impeller (18) is fixedly connected between the magnetic bearing seat (12) and the modulation ring (15), and the inner blades of the first impeller (18) are fixedly connected to the impeller shaft (11).

2. The high-speed suspended centrifugal fan based on magnetic field modulation according to claim 1, characterized in that: The magnetic bearing seat (12) is fixedly connected to a second impeller (21) at one end away from the first impeller (18); the inner blades of the second impeller (21) are fixedly connected to the impeller shaft (11); and an intercooler is connected between the air outlet of the first impeller (18) and the air inlet of the second impeller (21).

3. The high-speed suspended centrifugal fan based on magnetic field modulation according to claim 2, characterized in that: The first impeller (18) and the second impeller (21) are arranged back to back.

4. The high-speed suspended centrifugal fan based on magnetic field modulation according to claim 1, characterized in that: The modulation ring (15) is provided with a plurality of gap grooves (152).

5. The high-speed suspended centrifugal fan based on magnetic field modulation according to claim 1, characterized in that: A sealing ring (22) is fixedly connected at the connection between the magnetic bearing seat (12) and the first impeller (18) or the second impeller (21).

6. The high-speed suspended centrifugal fan based on magnetic field modulation according to claim 1, characterized in that: A third bearing (153) is fixedly connected between the impeller shaft (11) and the modulation ring (15).

7. The high-speed suspended centrifugal fan based on magnetic field modulation according to claim 1, characterized in that: An air filter (19) is detachably fixedly connected to the inner wall of each air inlet (151).

Images