A permanent magnet magnetic suspension shaftless low-noise and high-efficiency axial flow fan for thermal power plants

Abstract

The present invention discloses a permanent magnet magnetic levitation shaftless, low-noise, and high-efficiency axial flow fan for thermal power plants, relating to the technical field of magnetic levitation fans. The present invention comprises a cooling air island, the bottom of which is fixedly mounted with a body via a bracket, and an impeller, the impeller being rotatably mounted within the body, a magnetic ring being fixedly mounted on the sidewall of the impeller via a sealing ring, an annular cavity being formed on the sidewall of the body to cooperate with the magnetic ring, permanent magnets that cooperate with the magnetic ring being fixedly mounted on the upper and lower sidewalls of the annular cavity, and a magnetic force adjustment assembly that cooperates with the magnetic ring being further mounted within the annular cavity. The present invention has the advantages of automatically balancing the forces acting on the impeller by utilizing changes in magnetic force and air pressure at the outlet of the body when the impeller is operating, thereby improving the operational stability of the impeller. Furthermore, when the air pressure at the outlet of the body changes, changes in airflow can be utilized to automatically clean the interior of the body, further improving the overall operational stability.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic suspension fans, and in particular to a permanent magnetic suspension shaftless, low-noise, and high-efficiency axial flow fan for thermal power plants. Background Art

[0002] In the field of thermal power generation, axial flow fans are core equipment in systems such as air-cooled island cooling and boiler ventilation. Their performance directly impacts the energy consumption and operational stability of thermal power plants. Traditional axial flow fans generally use mechanical bearings and drive shafts, which can lead to high friction losses, high vibration and noise, and high maintenance costs.

[0003] In recent years, the application of magnetic levitation technology has significantly improved the efficiency of fans, but existing magnetic levitation axial flow fans still face many challenges. When the pipeline resistance suddenly changes (such as dust accumulation on the condenser fins causing increased resistance), the fan needs to output higher wind pressure to maintain flow. The resulting aerodynamic load can easily cause the magnetic levitation impeller to shift unexpectedly, which not only affects the dynamic balance of the impeller, but may also cause scratches on the casing. There is also a lack of adaptive adjustment mechanism for pressure overload caused by abnormal flow. When the system flow surges or the pipeline is blocked, the pressure at the fan outlet rises sharply, which can easily cause motor overload, component damage, and even safety accidents. Therefore, there is an urgent need to develop a permanent magnet magnetic levitation shaftless, low-noise, and high-efficiency axial flow fan for thermal power plants. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a permanent magnet magnetic suspension shaftless low-noise and high-efficiency axial flow fan for thermal power plants, which solves the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A permanent magnet magnetic suspension shaftless low-noise high-efficiency axial flow fan for thermal power plants, comprising a cooling air island, a body fixedly mounted on the bottom of the cooling air island via a bracket, and further comprising:

[0007] An impeller is rotatably mounted within the body, a magnetic ring being fixedly mounted on the side wall of the impeller via a sealing ring, an annular cavity cooperating with the magnetic ring being defined on the side wall of the body, permanent magnets cooperating with the magnetic ring being fixedly mounted on the upper and lower side walls of the annular cavity, a magnetic force adjustment assembly cooperating with the magnetic ring being further mounted within the annular cavity, the magnetic force adjustment assembly being used to adjust the magnitude of the magnetic force exerted on both sides of the magnetic ring, thereby adjusting the position of the impeller within the body;

[0008] The pressure relief portion includes a plurality of pressure relief holes provided near the outlet end of the body, a movable cavity in communication with the plurality of pressure relief holes provided in the body, and an alignment ring slidably installed in the movable cavity, the alignment ring having alignment holes provided thereon that match the plurality of pressure relief holes, and a trigger assembly that matches the alignment ring installed between the annular cavity and the movable cavity;

[0009] The air guide part includes an air guide ring fixedly mounted on the machine body, and the air guide ring is interconnected with a plurality of pressure relief holes, and a plurality of exhaust pipes are connected between the air guide ring and the air outlet end of the machine body.

[0010] Furthermore, a fixing ring is fixedly mounted on the side wall of the magnetic ring, the height of the annular cavity is smaller than the height of the sealing ring, and the thickness of the fixing ring is smaller than the thickness of the magnetic ring.

[0011] Furthermore, the magnetic adjustment component consists of a displacement sensor and two magnetic coils. The displacement sensor is fixedly installed in the annular cavity, and the position of the displacement sensor corresponds to the position of the fixed ring. The two magnetic coils are respectively fixedly installed at the two ends of the annular cavity, and the two magnetic coils respectively correspond to the positions of the two ends of the magnetic ring. A signal connection is used between the displacement sensor and the two magnetic coils.

[0012] Furthermore, the touch assembly consists of a moving ring and multiple connecting rods. The moving ring is slidably installed on the side of the annular cavity close to the outlet end of the body. The multiple connecting rods are fixedly installed between the moving ring and the alignment ring, and a through groove corresponding to the position of the displacement sensor is opened on the moving ring. Multiple springs are installed between the alignment ring and the moving cavity.

[0013] Furthermore, an annular groove is provided on the inner wall of the body away from the outlet end, and a rotating ring is sealed and rotatably installed in the annular groove, a scraper ring is fixedly installed on the inner wall of the rotating ring and fits the inner wall of the body, a fixed gear ring is fixedly installed on the side wall of the rotating ring, and a driving assembly that cooperates with the fixed gear ring is installed on the air guide ring.

[0014] Furthermore, the drive assembly consists of a fixed gear, a rotating rod, a connecting gear, a driving gear, a driving fan blade and a driving ring gear. The fixed gear is rotatably mounted on the side wall of the body through a rotating shaft, and the fixed gear is meshed with the fixed ring gear. The rotating rod is rotatably mounted on the side wall of the body, the connecting gear is fixedly mounted on the rotating rod, and the connecting gear is meshed with the fixed gear. The driving fan blade is sealed and rotatably mounted in the air guide ring. The driving ring gear is fixedly mounted on the side wall of the driving fan blade. The driving gear is fixedly mounted on the other end of the rotating rod, and the driving gear is meshed with the driving ring gear.

[0015] Furthermore, a support block is fixedly installed on the side wall of the body, and the support block is rotatably connected to the rotating rod. A fixed block is also fixedly installed on the side wall of the body, and the fixed block is rotatably connected to the rotating shaft, and the rotating shaft is fixedly connected to the fixed gear.

[0016] Furthermore, the driving fan blades are composed of an inner ring, an outer ring and a plurality of fan blades. The inner ring and the outer ring are both sealed and rotatably mounted in the air guide ring at one end away from the exhaust pipe, and the inner ring and the outer ring are staggered with the positions of the plurality of pressure relief holes. The plurality of fan blades are all fixedly mounted between the inner ring and the outer ring, and the positions of the fan blades and the pressure relief holes correspond. The driving gear ring is fixedly mounted on the side wall of the outer ring, and the driving gear ring and the air guide ring are sealed and rotatably connected.

[0017] Compared with the existing technology, the advantages of the present invention are:

[0018] 1: Through the cooperation of the magnetic adjustment component and the permanent magnet, the force on the impeller can be automatically balanced when the impeller rotates, so that its position in the machine body remains stable, which can improve the overall operation stability.

[0019] 2: Through the cooperation of the drive assembly and the pressure relief hole, when the impeller is displaced due to changes in air pressure, the outlet end of the body can be automatically depressurized to avoid damage caused by excessive movement of the impeller, thus achieving adaptive adjustment.

[0020] 3: Through the cooperation of the guide part and the drive assembly, when the pressure relief treatment is carried out at the outlet of the body, the discharged airflow can be used to drive the rotation of the rotating ring, so that the scraper ring can clean the inside of the body, improve the internal hygiene of the body, reduce the adverse effects of dust accumulation on the body's operating airflow, and further improve the overall operating stability.

[0021] To sum up, the present invention can automatically balance the force on the impeller by utilizing the changes in magnetic force and the changes in air pressure at the outlet of the machine body when the impeller is working, thereby improving the operating stability of the impeller. At the same time, when the air pressure at the outlet of the machine body changes, the airflow changes can also be used to automatically clean the inside of the machine body, further improving the overall operating stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural schematic diagram of a permanent magnet magnetic suspension shaftless low-noise and high-efficiency axial flow fan for thermal power plants proposed by the present invention;

[0023] Figure 2 for Figure 2 Structural diagram from another perspective;

[0024] Figure 3 for Figure 1 An enlarged schematic diagram of the structure at the mid-body;

[0025] Figure 4 for Figure 3 Schematic diagram of the structure of the mid-body;

[0026] Figure 5 for Figure 3 Schematic diagram of the internal structure of the middle body;

[0027] Figure 6 for Figure 5 Schematic diagram of the structure at the middle impeller from another perspective;

[0028] Figure 7 for Figure 4 Schematic diagram of the structure at the middle drive ring gear from another perspective;

[0029] Figure 8 for Figure 3 Front view of

[0030] Figure 9 for Figure 8 Schematic diagram of the structure of the AA surface;

[0031] Figure 10 for Figure 9 A schematic diagram of the structure of part a is enlarged;

[0032] Figure 11 for Figure 9 Schematic diagram of the enlarged structure of part b.

[0033] In the figure: 1. Cold air island; 2. Bracket; 3. Body; 4. Impeller; 5. Annular cavity; 6. Sealing ring; 7. Magnetic ring; 8. Permanent magnet; 9. Magnetic coil; 10. Displacement sensor; 11. Fixed ring; 12. Moving ring; 13. Pressure relief hole; 14. Moving cavity; 15. Alignment ring; 16. Alignment hole; 17. Spring; 18. Connecting rod; 19. Air guide ring; 20. Exhaust pipe; 21. Rotating ring; 22. Scraper ring; 23. Fixed gear ring; 24. Fixed gear; 25. Support block; 26. Rotating rod; 27. Connecting gear; 28. Driving gear; 29. Driving fan blade; 30. Driving gear ring. DETAILED DESCRIPTION

[0034] Reference Figures 1-11 A permanent magnet magnetic levitation shaftless, low-noise, and high-efficiency axial flow fan for thermal power plants includes a cooling island 1. A body 3 is fixedly installed at the bottom of the cooling island 1 through a bracket 2. The existing induced draft installation is adopted between the cooling island 1 and the body 3. When the body 3 is running, air flows through the condenser fin tube bundle on the cooling island 1, taking away the heat released by the condensation of steam in the tube bundle to achieve cooling treatment. It also includes an impeller 4, which is rotatably installed in the body 3. A motor is installed in the body 3. The output end of the motor is connected to the impeller 4 through a magnetic levitation bearing for suspending and supporting the impeller 4 and providing drive for the operation of the impeller 4 when the motor is working. The magnetic levitation installation method is an existing technology, and its working principle and specific structure are not elaborated here.

[0035] A magnetic ring 7 is fixedly mounted on the side wall of the impeller 4 through a sealing ring 6. An annular cavity 5 that cooperates with the magnetic ring 7 is opened on the side wall of the body 3. Permanent magnets 8 that cooperate with the magnetic ring 7 are fixedly mounted on the upper and lower side walls of the annular cavity 5. The two permanent magnets 8 have the same magnetic poles as the corresponding side of the magnetic ring 7, thereby exerting a repulsive force on the magnetic ring 7, causing it to suspend in the body 3, avoiding direct contact between the magnetic ring 7 on the impeller 4 and the annular cavity 5. A fixing ring 11 is fixedly mounted on the side wall of the magnetic ring 7. The height of the annular cavity 5 is less than the height of the sealing ring 6, and the thickness of the fixing ring 11 is less than the thickness of the magnetic ring 7. The design of the sealing ring 6 can prevent part of the gas from entering the annular cavity 5 when the impeller 4 is working, resulting in a change in the direction of gas flow and causing the impeller 4 to surge.

[0036] A magnetic adjustment component that cooperates with the magnetic ring 7 is also installed in the annular cavity 5. The magnetic adjustment component is used to adjust the size of the magnetic force on both sides of the magnetic ring 7, and then adjust the position of the impeller 4 in the body 3. The magnetic adjustment component consists of a displacement sensor 10 and two magnetic coils 9. The displacement sensor 10 is fixedly installed in the annular cavity 5, and the position of the displacement sensor 10 corresponds to the position of the fixed ring 11. The two magnetic coils 9 are respectively fixedly installed at both ends of the annular cavity 5, and the two magnetic coils 9 correspond to the positions of the two ends of the magnetic ring 7. The displacement sensor 10 and The two magnetic coils 9 are connected by a signal, and the displacement sensor 10 can monitor the position of the fixed ring 11 on the impeller 4 in the annular cavity 5 in real time. When the fixed ring 11 moves in the annular cavity 5, the displacement sensor 10 changes the magnetic force of the two magnetic coils 9 by controlling the current passing through the two magnetic coils 9, thereby adjusting the magnetic force on both sides of the magnetic ring 7 to maintain the stability of the position of the impeller 4. For example, when the impeller 4 moves downward, the displacement sensor 10 causes the magnetic coil 9 below to generate a larger repulsive force, causing the impeller 4 to move up and reset.

[0037] The pressure relief part includes a plurality of pressure relief holes 13 provided near the outlet end of the body 3, a movable cavity 14 connected to the plurality of pressure relief holes 13 provided in the body 3, and an alignment ring 15 is slidably installed in the movable cavity 14, and an alignment hole 16 matching the plurality of pressure relief holes 13 is provided on the alignment ring 15. When the body 3 operates normally, the alignment holes 16 and the pressure relief holes 13 are in an interlaced state, and the gas is discharged from the bottom of the body 3 at this time. When the air pressure in the body 3 is unstable and causes the impeller 4 to move down a certain distance, the alignment hole 16 corresponds to the position of the pressure relief hole 13, and part of the gas can be discharged outward from the pressure relief hole 13, thereby effectively realizing the pressure relief process and improving the stability of the impeller 4.

[0038] A touch assembly that cooperates with the alignment ring 15 is installed between the annular cavity 5 and the moving cavity 14. The touch assembly consists of a moving ring 12 and a plurality of connecting rods 18. The moving ring 12 is slidably installed on the side of the annular cavity 5 close to the outlet end of the body 3. The plurality of connecting rods 18 are fixedly installed between the moving ring 12 and the alignment ring 15. A through groove corresponding to the position of the displacement sensor 10 is opened on the moving ring 12. A plurality of springs 17 are installed between the alignment ring 15 and the moving cavity 14. When the impeller 4 moves downward in the annular cavity 5 and the displacement sensor 10 cannot control the magnetic When the force coil 9 keeps the impeller 4 in a stable position, when the impeller 4 moves and causes the movable ring 12 to move as well, the alignment ring 15 can be driven to move downward at the same time by the connecting rod 18. At this time, the relative positions of the alignment hole 16 and the pressure relief hole 13 change, and the opening of the pressure relief hole 13 can be automatically controlled to realize automatic control of the pressure relief process by utilizing the position change of the impeller 4. The purpose of the pressure relief process is to keep the impeller 4 in a stable position. Therefore, the movement of the impeller 4 itself under the change of air pressure can be used as a driving force to keep the impeller 4 stable.

[0039] The guide part includes an air guide ring 19 fixedly mounted on the body 3, and the air guide ring 19 is interconnected with multiple pressure relief holes 13. Multiple exhaust pipes 20 are connected between the air guide ring 19 and the air outlet end of the body 3. The cooperation between the air guide ring 19 and the multiple exhaust pipes 20 is used to guide and transport the gas discharged from the pressure relief holes 13 so that it is also discharged from the bottom of the body 3, thereby avoiding changes in gas flow direction affecting the operation effect of the body 3.

[0040] An annular groove is provided on the inner wall of the body 3 away from the outlet end, and a rotating ring 21 is sealed and rotatably installed in the annular groove. A scraper ring 22 is fixedly installed on the inner wall of the rotating ring 21 and fits the inner wall of the body 3. When the rotating ring 21 rotates, the scraper ring 22 can scrape and clean the inner wall of the body 3, thereby improving the cleanliness of the interior of the body 3. The scraped dust will be discharged under the action of the airflow when the impeller 4 is working.

[0041] A fixed gear ring 23 is fixedly mounted on the side wall of the rotating ring 21, and a driving assembly that cooperates with the fixed gear ring 23 is installed on the air guide ring 19. The driving assembly consists of a fixed gear 24, a rotating rod 26, a connecting gear 27, a driving gear 28, a driving blade 29 and a driving gear ring 30. The fixed gear 24 is rotatably mounted on the side wall of the body 3 through a rotating shaft, and the fixed gear 24 is meshed with the fixed gear ring 23. The rotating rod 26 is rotatably mounted on the side wall of the body 3, and the connecting gear 27 is fixedly mounted on the rotating rod 26, and the connecting gear 27 is meshed with the fixed gear 24. The driving blade 29 is sealed and rotatably mounted on the air guide ring. 19, the driving ring gear 30 is fixedly mounted on the side wall of the driving fan blade 29, and the driving gear 28 is fixedly mounted on the other end of the rotating rod 26, and the driving gear 28 is meshed with the driving ring gear 30. When the pressure relief hole 13 is opened, the gas entering the air guide ring 19 can push the driving fan blade 29 to rotate. At this time, the rotating rod 26 rotates at the same time under the meshing effect of the driving ring gear 30 and the driving gear 28, and then the connecting gear 27 drives the fixed gear 24 to rotate. The meshing effect of the fixed gear 24 and the fixed ring gear 23 is used to make the rotating ring 21 drive the scraper ring 22 to rotate, thereby automatically realizing the cleaning of the inside of the machine body 3.

[0042] A support block 25 is fixedly mounted on the side wall of the body 3, and the support block 25 is rotatably connected to the rotating rod 26. A fixed block is also fixedly mounted on the side wall of the body 3, and the fixed block is rotatably connected to the rotating shaft. The rotating shaft is fixedly connected to the fixed gear 24. The driving fan blade 29 consists of an inner ring, an outer ring and a plurality of fan blades. The inner ring and the outer ring are both sealed and rotatably mounted in the air guide ring 19 at one end away from the exhaust pipe 20, and the inner ring and the outer ring are staggered with the positions of the plurality of pressure relief holes 13. The plurality of fan blades are fixedly mounted between the inner ring and the outer ring, and the positions of the fan blades and the pressure relief holes 13 correspond. The driving gear ring 30 is fixedly mounted on the side wall of the outer ring, and the driving gear ring 30 is sealed and rotatably connected to the air guide ring 19.

[0043] The basic principles, main features and advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A permanent magnet magnetic suspension shaftless low-noise high-efficiency axial flow fan for thermal power plants, comprising a cooling air island (1), wherein an organic body (3) is fixedly mounted on the bottom of the cooling air island (1) via a bracket (2), characterized in that: Also includes: An impeller (4), the impeller (4) being rotatably mounted in the machine body (3), a magnetic ring (7) being fixedly mounted on the side wall of the impeller (4) via a sealing ring (6), an annular cavity (5) cooperating with the magnetic ring (7) being provided on the side wall of the machine body (3), permanent magnets (8) cooperating with the magnetic ring (7) being fixedly mounted on both upper and lower side walls of the annular cavity (5), a magnetic force adjustment component cooperating with the magnetic ring (7) being further mounted in the annular cavity (5), the magnetic force adjustment component being used to adjust the magnitude of the magnetic force exerted on both sides of the magnetic ring (7), thereby adjusting the position of the impeller (4) in the machine body (3); A pressure relief portion, the pressure relief portion includes a plurality of pressure relief holes (13) provided near the outlet end of the body (3), a movable cavity (14) in communication with the plurality of pressure relief holes (13) provided in the body (3), and a positioning ring (15) slidably installed in the movable cavity (14), a positioning hole (16) matching with the plurality of pressure relief holes (13) provided on the positioning ring (15), and a touch assembly matching with the positioning ring (15) installed between the annular cavity (5) and the movable cavity (14); A flow guide portion, the flow guide portion includes an air guide ring (19) fixedly mounted on the body (3), the air guide ring (19) being in communication with a plurality of pressure relief holes (13), a plurality of exhaust pipes (20) being in communication between the air guide ring (19) and the air outlet end of the body (3), a fixed ring (11) being fixedly mounted on the side wall of the magnetic ring (7), a height of the annular cavity (5) being smaller than a height of the sealing ring (6), and a thickness of the fixed ring (11) being smaller than a thickness of the magnetic ring (7); The magnetic force adjustment component is composed of a displacement sensor (10) and two magnetic coils (9), the displacement sensor (10) is fixedly mounted in the annular cavity (5), and the position of the displacement sensor (10) corresponds to the position of the fixed ring (11), the two magnetic coils (9) are respectively fixedly mounted at both ends of the annular cavity (5), and the two magnetic coils (9) respectively correspond to the positions of the two ends of the magnetic ring (7), and the displacement sensor (10) and the two magnetic coils (9) are connected by signals; The touch assembly is composed of a moving ring (12) and a plurality of connecting rods (18). The moving ring (12) is slidably mounted on a side of the annular cavity (5) close to the outlet end of the body (3). The plurality of connecting rods (18) are fixedly mounted between the moving ring (12) and the alignment ring (15). A through groove corresponding to the position of the displacement sensor (10) is provided on the moving ring (12). A plurality of springs (17) are installed between the alignment ring (15) and the moving cavity (14).

2. A permanent magnet magnetic suspension shaftless low-noise high-efficiency axial flow fan for thermal power plants according to claim 1, characterized in that: An annular groove is provided on the inner wall of the body (3) away from the outlet end, and a rotating ring (21) is installed in the annular groove for sealing rotation. A scraper ring (22) is fixedly installed on the inner wall of the rotating ring (21) and is in contact with the inner wall of the body (3). A fixed gear ring (23) is fixedly installed on the side wall of the rotating ring (21). A driving component that cooperates with the fixed gear ring (23) is installed on the air guide ring (19).

3. A permanent magnet magnetic suspension shaftless low-noise high-efficiency axial flow fan for thermal power plants according to claim 2, characterized in that: The driving assembly is composed of a fixed gear (24), a rotating rod (26), a connecting gear (27), a driving gear (28), a driving blade (29) and a driving ring gear (30). The fixed gear (24) is rotatably mounted on the side wall of the body (3) through a rotating shaft, and the fixed gear (24) is meshed with the fixed ring gear (23). The rotating rod (26) is rotatably mounted on the side wall of the body (3). The connecting gear (27) is fixedly mounted on the rotating rod (26), and the connecting gear (27) is meshed with the fixed gear (24). The driving blade (29) is sealed and rotatably mounted in the air guide ring (19). The driving ring gear (30) is fixedly mounted on the side wall of the driving blade (29). The driving gear (28) is fixedly mounted on the other end of the rotating rod (26), and the driving gear (28) is meshed with the driving ring gear (30).

4. A permanent magnet magnetic suspension shaftless low-noise high-efficiency axial flow fan for thermal power plants according to claim 3, characterized in that: A support block (25) is fixedly mounted on the side wall of the machine body (3), and the support block (25) is rotatably connected to the rotating rod (26). A fixed block is also fixedly mounted on the side wall of the machine body (3), and the fixed block is rotatably connected to the rotating shaft. The rotating shaft is fixedly connected to the fixed gear (24).

5. The permanent magnet magnetic suspension shaftless low-noise high-efficiency axial flow fan for thermal power plants according to claim 3, characterized in that: The driving fan blade (29) is composed of an inner ring, an outer ring and a plurality of fan blades. The inner ring and the outer ring are both sealed and rotatably mounted in the air guide ring (19) at one end away from the exhaust pipe (20), and the inner ring and the outer ring are staggered with the positions of the plurality of pressure relief holes (13). The plurality of fan blades are fixedly mounted between the inner ring and the outer ring, and the positions of the fan blades and the pressure relief holes (13) correspond. The driving gear ring (30) is fixedly mounted on the side wall of the outer ring, and the driving gear ring (30) is sealed and rotatably connected to the air guide ring (19).

Images