Angle-adjustable large energy-saving fan

Abstract

The application relates to the field of fluid conveying automatic control equipment, and discloses a large energy-saving fan with adjustable angle, which comprises a frame, a variable frequency motor installed on the outside of the frame, a transmission shaft for providing rotating power of the fan and blades, an angle adjusting mechanism for adjusting the angle of the blades is installed on the outside of the transmission shaft, a power mechanism for driving the angle adjusting mechanism to act is installed on the top of the frame, and a synchronization mechanism for linkage of multiple blades is arranged on the outside of the angle adjusting mechanism. Through the double driving of the variable frequency motor and the servo push rod and the cooperation of the control module to form a closed loop control system, the control module can not only automatically adjust the rotating speed of the variable frequency motor according to the ambient temperature, but also can accurately control the stroke of the servo push rod through the real-time feedback of the angle signal of the blades by the encoder, and the fan can perfectly match the actual working condition demand through the use of the angle adjusting mechanism, so that the energy-saving effect of the fan is improved.

Description

Technical Field

[0001] This invention relates to the field of automated control equipment for fluid transport, specifically a large energy-saving fan with an adjustable angle. Background Technology

[0002] With the development of industrial automation, large fans are widely used in ventilation, dust removal and cooling systems in factories, mines, tunnels, cooling towers, vehicles, ships and buildings. Especially in large industrial cooling towers, as the core equipment for heat exchange, the operating efficiency of the fan directly affects the energy consumption and cooling effect of the entire system. However, existing large fans still have some shortcomings in practical applications.

[0003] Traditional large fans are mostly driven by fixed-frequency motors with constant speed, which cannot flexibly adjust the air volume according to the ambient temperature and humidity or actual operating conditions. Although some fans have introduced variable frequency control, they often lack coordinated control with the blade angle, which means that the blade angle cannot be adjusted to reduce energy consumption under low load conditions.

[0004] Existing wind turbines are usually installed outdoors at high altitudes and often face severe weather such as strong winds and heavy rain. If the regulating mechanism is in a power outage or shutdown state, the blades are often in a free state or the locking force is insufficient, which can easily cause violent shaking, leading to fatigue damage to the mechanical structure, or even blade breakage and flying out, thus compromising the safety of wind turbine use.

[0005] Therefore, there is an urgent need to develop a large-scale energy-saving fan with an adjustable angle to solve the above-mentioned technical problems. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a large-scale energy-saving fan with an adjustable angle, solving the problems of existing fans being unable to achieve coordinated adjustment of blade angle and rotation speed, and having insufficient safety.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: a large energy-saving fan with adjustable angle, comprising a frame, a variable frequency motor installed outside the frame, a transmission shaft and blades for providing rotational power to the fan, an angle adjustment mechanism for adjusting the angle of the blades is installed outside the transmission shaft, a power mechanism for driving the angle adjustment mechanism is installed on the top of the frame, and a synchronization mechanism for the linkage of multiple blades is provided outside the angle adjustment mechanism. The angle adjustment mechanism includes a rotating moving ring movably mounted outside the drive shaft and a connecting rod movably mounted between the rotating moving ring and the blade shaft; The power mechanism includes a servo push rod, an angle detection unit is installed at the root of the blade's shaft, the servo push rod is electrically connected to a control module, and the control module controls the push-pull action of the servo push rod according to the signal from the detection unit; The push-pull action of the servo push rod drives the rotating moving ring to move the connecting rod, which is used to adjust the operating angle of the blade. The angle adjustment signal is transmitted through the angle detection unit, so that the control module controls the push-pull action of the servo push rod to form a closed loop, and the synchronization mechanism forces multiple blades to complete the angle adjustment synchronously.

[0008] Preferably, the angle adjustment mechanism further includes a linkage frame, a cooperating movable cylinder, an upper fixed column, a lower fixed column, a cooperating rack, a mounting plate, and a fixed cylinder; The linkage frame is fixedly installed on the top of the mating movable cylinder, the rotating movable ring bearing is installed on the outer wall of the mating movable cylinder, the mating rack is fixedly connected to the outer wall of the transmission shaft, and the mating movable cylinder is movably sleeved on the outside of the mating rack; The upper fixed column is installed at an equal angle on the outside of the rotating moving ring, the lower fixed column is fixedly installed on the outside of the blade's rotating shaft, and a protective cover is fixedly connected to the bottom of the mounting plate. The protective cover rotates with the transmission shaft and covers the outside of the angle adjustment mechanism and the synchronization mechanism.

[0009] Preferably, the two ends of the connecting rod are movably connected to the upper fixed column and the lower fixed column respectively through fisheye joint bearings, the mounting plate is fixedly installed at the bottom end of the transmission shaft, and the fixed cylinder is installed at equal distances on the outer side of the mounting plate, and the inner side of the fixed cylinder is rotatably connected to the blade shaft through a bearing; One of the blades has an encoder mounted on one end of its shaft via a flexible coupling, and the encoder is fixedly installed inside the mounting plate. The angle detection unit is an encoder.

[0010] Preferably, the power mechanism further includes a push-pull plate, a moving block, a slide groove, an inclined plate, a carriage, a limiting post, and a protective box; The protective box is fixedly installed on the top of the frame, and the servo push rod is fixedly installed on the top of the frame and located inside the protective box; The push-pull plate is fixedly installed at one end of the telescopic rod of the servo push rod, the moving block is movably set at the top of the frame, the slide groove is opened on one side of the moving block, and the inclined panel is fixedly connected to the top two sides of the linkage frame, and the inclined panel is slidably set inside the slide groove.

[0011] Preferably, the slide is fixedly connected to one side of the push-pull plate, the limiting posts are symmetrically installed on the top of the frame, and the slide is slidably disposed on the outside of the limiting posts to restrict the horizontal movement of the moving block; The horizontal movement of the moving block forces the connecting frame to slide along the slide groove, and causes the connecting frame to move up and down.

[0012] Preferably, the synchronization mechanism includes a connecting frame, a fixed ring, a follower ring, a follower plate, a gear ring, a rotating column, a synchronization gear, a transmission bevel gear, and a shaft bevel gear; The connecting frame is fixedly installed on one side of the frame, the fixing ring is fixedly installed on the bottom inner side of the connecting frame, the follower ring is rotatably installed inside the fixing ring through a bearing, and the toothed ring is rotatably installed inside the follower ring through a bearing. The follower plates are installed at equal intervals at the bottom of the follower ring, and the rotating column is rotatably installed inside the follower plate through a bearing.

[0013] Preferably, the synchronous gear and the transmission bevel gear are fixedly installed at both ends of the rotating column, and the synchronous gear meshes with the inner side of the gear ring, the transmission bevel gear meshes with the shaft bevel gear, and the shaft bevel gear is fixedly connected to the outer wall of the rotating shaft of the blade. When the blade's shaft is driven to rotate for angle adjustment, the shaft bevel gear drives the transmission bevel gear and the rotating column to rotate, causing the synchronous gear to drive the gear ring to rotate, thereby driving multiple synchronous gears to rotate simultaneously, forcing multiple blades to adjust their angle synchronously.

[0014] Preferably, a self-locking mechanism is installed on the inner side of the protective box. The self-locking mechanism includes a toothed plate, a toothed block, a movable column, an armature ring, a plug, a spring, and a ring electromagnet. The toothed plate is fixedly connected to the inner top wall of the protective box, the toothed block is engaged at the bottom of the toothed plate, the movable column is fixedly connected to the bottom of the toothed block, and the armature ring is fixedly connected to the outer wall of the bottom end of the movable column. The insertion post is fixedly connected to the bottom end of the movable post, and the insertion post is inserted into the hollow ring of the annular electromagnet to restrict the vertical movement of the movable post. The annular electromagnet is fixedly installed on the top of the push-pull plate. The spring is sleeved on the outside of the movable post, and the two ends of the spring are fixedly installed with the tooth block and the push-pull plate respectively.

[0015] Preferably, when the annular electromagnet is energized, it generates magnetic force that attracts the armature ring, forcing the tooth block to separate from the tooth plate, thereby adjusting the blade angle. When the annular electromagnet is de-energized, the magnetic force disappears, and the armature ring is elastically reset upward by the spring, so that the tooth block engages with the tooth plate and fixes the adjustment angle of the blade.

[0016] Preferably, a limiting mechanism is installed on the outer wall of the drive shaft, and the limiting mechanism includes an upper retaining ring and a lower retaining ring. The upper retaining ring and the lower retaining ring are respectively disposed at both ends of the mating rack, which are used to limit the movement distance of the mating moving cylinder and force the blade to rotate within a set range. The control module includes a PLC and a frequency converter. The PLC is communicatively connected to the frequency converter and is used to adjust the speed of the variable frequency motor. The PLC is configured to monitor the operating current of the servo push rod and determine the health status of the blade based on the current fluctuation.

[0017] Working principle: When the fan is working, the variable frequency motor drives the transmission shaft and blades to rotate to generate airflow. The control module first adjusts the speed of the variable frequency motor to change the basic airflow based on the preset program or feedback signals from environmental sensors. At the same time, when further fine-tuning of airflow or efficiency is required, the power mechanism is activated, and the angle adjustment mechanism is driven by the extension and retraction of the servo push rod, which drives all blades to rotate synchronously to change their angle. During this process, the encoder detects the blade angle in real time and feeds it back to the control module to form a closed-loop control, ensuring accurate angle adjustment. The synchronization mechanism forces the consistent movement of multiple blades, and the self-locking mechanism automatically locks the adjustment mechanism after adjustment or when power is cut off to prevent the blades from swaying in strong winds. Ultimately, the fan can operate efficiently, energy-savingly, and safely within the set range.

[0018] This invention provides a large, energy-saving fan with an adjustable angle. It has the following beneficial effects: 1. This invention sets up a dual drive system of variable frequency motor and servo push rod, and forms a closed-loop control system with the help of a control module. The control module not only automatically adjusts the speed of the variable frequency motor according to the ambient temperature, but also accurately controls the stroke of the servo push rod by feeding back the angle signal of the blades in real time through the encoder. At the same time, with the use of the angle adjustment mechanism, the fan can perfectly match the actual working conditions, thereby improving the energy-saving effect of the fan.

[0019] 2. This invention utilizes a synchronization mechanism, with the meshing of a connecting frame, gear rings, synchronization gears, and transmission bevel gears, to drive all gear rings to rotate synchronously when any blade is adjusted in angle. This mechanical rigid connection solves the vibration problem caused by asynchronous adjustment of multiple blades, and even if a single connecting rod fails, the blade will not go out of control, thereby improving the safety of the wind turbine operation.

[0020] 3. The present invention integrates a self-locking mechanism into the power mechanism. The armature ring is attracted and released by controlling the on and off of the annular electromagnet. When the power is cut off or an emergency stop is made, the spring resets and pushes the tooth block to engage with the tooth plate, thereby achieving rigid locking of the servo push rod. This ensures that the blade angle is fixed when the machine is stopped and will not reverse or shake violently due to strong winds, effectively protecting the main structure of the wind turbine.

[0021] 4. The present invention fixes the encoder inside the mounting plate that rotates with the shaft, which is compact and convenient for real-time detection of the blade angle. The control module can identify whether the blade is obstructed or damaged by monitoring the fluctuation of the operating current of the servo push rod, so as to realize predictive maintenance. At the same time, a limit mechanism is set to strictly limit the movement distance of the moving cylinder to ensure that the blade angle is always kept within a safe and efficient range, and to prevent mechanical interference or structural damage caused by excessive adjustment. Attached Figure Description

[0022] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram showing the positions of the power mechanism and the self-locking mechanism of the present invention; Figure 3 This is a schematic diagram showing the position of the drive shaft of the present invention; Figure 4 This is a schematic diagram showing the position of the blades in this invention; Figure 5 This is a schematic diagram of the connection structure between the angle adjustment mechanism and the synchronization mechanism of the present invention; Figure 6 This is a schematic diagram of the angle adjustment mechanism of the present invention; Figure 7 This is a schematic diagram of the disassembled structure of the angle adjustment mechanism of the present invention; Figure 8 This is a schematic diagram of the synchronization mechanism and the limiting mechanism of the present invention; Figure 9 This is a schematic diagram of the disassembled structure of the synchronization mechanism of the present invention; Figure 10 This is a schematic diagram of the internal structure of the power mechanism of the present invention; Figure 11 This is a schematic diagram of the power mechanism of the present invention; Figure 12 For the present invention Figure 7 Enlarged view of point A; Figure 13 For the present invention Figure 9 Enlarged view of point A; Figure 14 For the present invention Figure 10 Enlarged view of point A; Figure 15 For the present invention Figure 11 Enlarged view of point A; Figure 16 For the present invention Figure 11 Enlarged diagram of point B.

[0023] The components include: 1. Frame; 2. Variable frequency motor; 3. Drive shaft; 4. Angle adjustment mechanism; 41. Linkage frame; 42. Matching moving cylinder; 43. Rotating moving ring; 44. Upper fixed column; 45. Connecting rod; 46. Lower fixed column; 47. Matching rack; 48. Mounting plate; 49. Fixed cylinder; 5. Power mechanism; 51. Servo push rod; 52. Push-pull plate; 53. Moving block; 54. Slide groove; 55. Inclined panel; 56. Carriage; 57. Limiting column; 58. Protective element. 6. Box; 7. Blade; 8. Synchronization mechanism; 9. Connecting frame; 10. Fixed ring; 11. Follower ring; 12. Follower plate; 13. Gear ring; 14. Rotating column; 15. Synchronization gear; 16. Transmission bevel gear; 17. Shaft bevel gear; 18. Self-locking mechanism; 19. Gear plate; 20. Gear block; 11. Moving column; 22. Armature ring; 33. Insertion column; 44. Spring; 55. Ring electromagnet; 66. Limiting mechanism; 77. Upper retaining ring; 88. Lower retaining ring; 99. Encoder. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see the appendix Figure 1-16 This invention provides a large energy-saving fan with adjustable angle, including a frame 1, a variable frequency motor 2 installed outside the frame 1, a drive shaft 3 for providing rotational power to the fan, and blades 6. An angle adjustment mechanism 4 for adjusting the angle of the blades 6 is installed outside the drive shaft 3. A power mechanism 5 for driving the angle adjustment mechanism 4 is installed on the top of the frame 1. A synchronization mechanism 7 for multiple blades 6 to move together is provided outside the angle adjustment mechanism 4. The angle adjustment mechanism 4 includes a rotating moving ring 43 movably installed outside the drive shaft 3 and a connecting rod 45 movably installed between the rotating moving ring 43 and the rotating shaft of the blades 6. The power mechanism 5 includes a servo push rod 51. An angle detection unit is installed at the root of the rotating shaft of the blades 6. The servo push rod 51 is electrically connected to a control module. The control module controls the pushing and pulling action of the servo push rod 51 according to the signal of the detection unit. The push-pull action of the servo push rod 51 drives the rotating moving ring 43 to drive the connecting rod 45, which is used to adjust the operating angle of the blade 6. The angle adjustment signal is transmitted through the angle detection unit, so that the control module controls the push-pull action of the servo push rod 51 to form a closed loop, and the synchronization mechanism 7 forces multiple blades 6 to complete the angle adjustment synchronously. When in use, the fan is fixedly installed through frame 1, and a floor-mounted control box or wall-mounted control box is set for the fan to facilitate the installation of internal control modules, thereby realizing the intelligent use of the fan. Sensor modules can be installed in the operating environment. For example, when used at the top of a cooling tower, the angle of the blades 6 can be determined based on the temperature and humidity sensors, thereby increasing the air volume at high temperatures and decreasing the air volume at low temperatures to achieve energy-saving effects.

[0026] Please see the appendix Figure 1 , 2 4-7, 10-13 and appendix Figure 16 The linkage frame 41 is fixedly installed on the top of the mating moving cylinder 42. The rotating moving ring 43 is bearing installed on the outer wall of the mating moving cylinder 42. The mating rack 47 is fixedly connected to the outer wall of the transmission shaft 3, and the mating moving cylinder 42 is movably sleeved on the outside of the mating rack 47. The upper fixed column 44 is installed at equal angles on the outside of the rotating moving ring 43. The lower fixed column 46 is fixedly installed on the outside of the rotating shaft of the blade 6. The bottom of the mounting plate 48 is fixedly connected to a protective cover, and the protective cover rotates with the transmission shaft 3 and covers the outside of the angle adjustment mechanism 4 and the synchronization mechanism 7. The protective cover has holes corresponding to the rotating shaft position of the blade 6 to facilitate the rotation and adjustment of the blade 6 angle. The protective cover fixed at the bottom of the mounting plate 48 prevents large particles of impurities in the airflow from entering the gears and avoids jamming of the internal structure. In order to achieve lightweight while ensuring structural strength and reducing the operating load of the fan, the protective cover can be made of fiber composite material.

[0027] The two ends of the connecting rod 45 are movably connected to the upper fixed column 44 and the lower fixed column 46 respectively through fisheye spherical bearings. The mounting plate 48 is fixedly installed at the bottom end of the transmission shaft 3, and the fixed cylinder 49 is installed at equal distances on the outside of the mounting plate 48. The inside of the fixed cylinder 49 is rotatably connected to the rotating shaft of the blade 6 through a bearing. One end of the rotating shaft of one of the blades 6 is equipped with an encoder 10 through a flexible coupling, and the encoder 10 is fixedly installed inside the mounting plate 48. The angle detection unit is the encoder 10. The protective box 58 is fixedly installed on the top of the frame 1. The servo push rod 51 is fixedly installed on the top of the frame 1 and is located inside the protective box 58. The push-pull plate 52 is fixedly installed on one end of the telescopic rod of the servo push rod 51. The moving block 53 is movably located on the top of the frame 1. The slide groove 54 is opened on one side of the moving block 53. The inclined plate 55 is fixedly connected to the top two sides of the linkage frame 41 and is slidably located inside the slide groove 54. The slide 56 is fixedly connected to one side of the push-pull plate 52. The limiting post 57 is symmetrically installed on the top of the frame 1 and is slidably located outside the limiting post 57 to limit the horizontal movement of the moving block 53. The horizontal movement of the moving block 53 forces the linkage frame 41 to slide along the slide groove 54 and causes the linkage frame 41 to move up and down. When the blade angle of blade 6 is adjusted according to the requirements, the control module activates the servo push rod 51 to push and pull. The slide 56 slides outside the limit post 57 to limit the movement, causing the moving block 53 to move horizontally. When the moving block 53 moves, the linkage frame 41 is attached to and slidably set inside the slide groove 54 through the inclined plate 55, which forces the linkage frame 41 to move inside the slide groove 54, thus causing vertical movement. This causes the linkage frame 41 to drive the mating moving cylinder 42 to move vertically. Since the moving cylinder 42 moves outside the transmission shaft 3 by engaging with the rack 47, and the rotating ring 43 is rotatably mounted with the moving cylinder 42 through the bearing, the angle of the blade 6 can be adjusted while the transmission shaft 3 drives the blade 6 to rotate. The vertical movement of the moving cylinder 42 causes the upper fixed column 44 to push and pull the connecting rod 45, and the fisheye joint bearing adapts to the deflection angle of the push, pull and rotation, so that the rotating shaft of the blade 6 rotates inside the fixed cylinder 49 through the bearing. Simultaneously, the encoder 10 connected to one end of the rotating shaft detects the rotation angle of the blade 6, and then transmits the detection signal to the control module, which then controls the servo push rod 51 to continue pushing or pulling or stop pushing or pulling. The encoder 10 is installed inside the mounting plate 48 and will rotate simultaneously with the drive shaft 3. When installing the drive shaft 3, an electric slip ring is installed at the top of the drive shaft 3. The connecting wire of the encoder 10 passes through the hollow shaft of the drive shaft 3 and is connected to the electric slip ring (not shown in the figure). The electric slip ring is fixed to the top of the frame 1 by the mounting bracket, which facilitates the fixed connection of the output wire and ensures that the encoder 10 can be used when rotating.

[0028] Please see the appendix Figure 4-6 8 and appendix Figure 9 The connecting frame 71 is fixedly installed on one side of the frame 1, the fixing ring 72 is fixedly installed on the bottom inner side of the connecting frame 71, the follower ring 73 is rotatably installed inside the fixing ring 72 through the bearing, the toothed ring 75 is rotatably installed inside the follower ring 73 through the bearing, the follower plate 74 is equidistantly installed at the bottom of the follower ring 73, and the rotating column 76 is rotatably installed inside the follower plate 74 through the bearing. Synchronous gear 77 and transmission bevel gear 78 are respectively fixedly installed at both ends of rotating column 76. Synchronous gear 77 meshes with the inner side of gear ring 75. Transmission bevel gear 78 meshes with shaft bevel gear 79. Shaft bevel gear 79 is fixedly connected to the outer wall of rotating shaft of blade 6. When rotating shaft of blade 6 is driven to rotate for angle adjustment, shaft bevel gear 79 drives transmission bevel gear 78 and rotating column 76 to rotate, causing synchronous gear 77 to drive gear ring 75 to rotate, thereby driving multiple synchronous gears 77 to rotate simultaneously, forcing multiple blades 6 to adjust angle synchronously. When the blade 6 is pushed and pulled by the connecting rod 45 to form the corresponding angle, the rotation of the blade 6 shaft drives the shaft bevel gear 79 to rotate, and through the transmission of the transmission bevel gear 78 and the rotating column 76, the synchronous gear 77 is driven to rotate. The rotation of the synchronous gear 77 causes the gear ring 75 to rotate inside the follower ring 73 through the bearing, thereby driving the gear ring 75 to drive the multiple synchronous gears 77 inside to rotate simultaneously, thereby forcing multiple blades 6 to rotate synchronously and adjust the angle. This rigid mechanical connection allows multiple blades 6 to be kept rotating by other blades 6 in conjunction with the synchronization mechanism 7 when a single blade 6 is damaged or the connection with the connecting rod 45 is broken. The control module detects the current fluctuation of the servo push rod 51 to determine the health status of the blades 6. When abnormal current fluctuation occurs, the control module sends a message to maintenance personnel for timely repair, thereby ensuring the safe operation of the fan.

[0029] Please see the appendix Figure 7 , 10 14 and Appendix Figure 15 A self-locking mechanism 8 is installed inside the protective box 58. The toothed plate 81 is fixedly connected to the inner top wall of the protective box 58. The toothed block 82 is engaged at the bottom of the toothed plate 81. The moving column 83 is fixedly connected to the bottom of the toothed block 82. The armature ring 84 is fixedly connected to the bottom outer wall of the moving column 83. The insertion column 85 is fixedly connected to the bottom of the moving column 83 and is inserted into the hollow ring of the annular electromagnet 87 to restrict the vertical movement of the moving column 83. The annular electromagnet 87 is fixedly installed on the top of the push-pull plate 52. The spring 86 is sleeved on the outside of the moving column 83, and the two ends of the spring 86 are fixedly installed with the toothed block 82 and the push-pull plate 52 respectively. When the annular electromagnet 87 is energized, it generates magnetic force and magnetically attracts the armature ring 84, forcing the tooth block 82 to separate from the tooth plate 81. The servo push rod 51 pushes and pulls the push-pull plate 52 to adjust the angle of the blade 6. When the annular electromagnet 87 is de-energized, the magnetic force disappears, and the armature ring 84 is elastically reset upward by the spring 86, so that the tooth block 82 and the tooth plate 81 are engaged, fixing the adjustment angle of the blade 6. A limit mechanism 9 is installed on the outer wall of the drive shaft 3. The upper retaining ring 91 and the lower retaining ring 92 are respectively set at both ends of the mating rack 47 to limit the movement distance of the mating moving cylinder 42, forcing the blade 6 to rotate within a set range. The control module includes a PLC and a frequency converter. The PLC is connected to the frequency converter for adjusting the speed of the frequency converter motor 2. The PLC is configured to monitor the operating current of the servo push rod 51 and judge the health status of the blade 6 based on the current fluctuation. The annular electromagnet 87 and the servo push rod 51 are synchronously powered on and off. When the servo push rod 51 is working, the annular electromagnet 87 is powered on and generates magnetic force, which attracts and fixes the armature ring 84 downward, so that the insertion post 85 is inserted into the inner hole ring of the annular electromagnet 87 for limitation, and compresses the spring 86 downward, so that the tooth block 82 is separated from the tooth plate 81, thus facilitating the push and pull operation of the servo push rod 51. When the servo push rod 51 is powered off after working or when there is an abnormal power failure, the electromagnetic force of the annular electromagnet 87 disappears, and the tooth block 82 is elastically squeezed upward by the spring 86 to reset, thereby locking the tooth block 82 into the bottom of the tooth plate 81, locking the servo push rod 51, and fixing the linkage frame 41 in the moving position, thereby fixing the operating angle of the blade 6. In the event of strong winds or other harsh environments, the blade 6 will not swing or rotate back and forth. Since the upper retaining ring 91 and the lower retaining ring 92 are installed on the outer wall of the transmission shaft 3 and are located at both ends of the mating rack 47, the mating moving cylinder 42 is limited in its movement, so that the blade 6 can only be adjusted and used within a set range. This specific set range can be preset during manufacturing and processing according to different application scenarios to meet the normal operating range of the fan. At the same time, it avoids the situation where the internal structure is damaged and the rotation angle of a single blade 6 is excessive, causing the blade 6 to hit other structures of the fan and resulting in overall damage to the fan, thereby improving the reliability of the fan during long-term use.

[0030] 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 and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A large energy-saving fan with adjustable angle, comprising a frame (1), a variable frequency motor (2) mounted outside the frame (1), a drive shaft (3) for providing rotational power to the fan, and blades (6), characterized in that, An angle adjustment mechanism (4) for adjusting the angle of the blades (6) is installed on the outside of the drive shaft (3). A power mechanism (5) for driving the angle adjustment mechanism (4) is installed on the top of the frame (1). A synchronization mechanism (7) for the linkage of multiple blades (6) is provided on the outside of the angle adjustment mechanism (4). The angle adjustment mechanism (4) includes a rotating moving ring (43) movably mounted outside the transmission shaft (3) and a connecting rod (45) movably mounted between the rotating moving ring (43) and the blade (6) shaft. The power mechanism (5) includes a servo push rod (51), and an angle detection unit is installed at the root of the rotating shaft of the blade (6). The servo push rod (51) is electrically connected to a control module, and the control module controls the push and pull action of the servo push rod (51) according to the signal of the detection unit. The push-pull action of the servo push rod (51) drives the rotating moving ring (43) to drive the connecting rod (45) to adjust the operating angle of the blade (6), and transmits the angle adjustment signal through the angle detection unit, so that the control module controls the push-pull action of the servo push rod (51) to form a closed loop, and forces multiple blades (6) to complete the angle adjustment synchronously through the synchronization mechanism (7).

2. The large energy-saving fan with adjustable angle according to claim 1, characterized in that, The angle adjustment mechanism (4) also includes a linkage frame (41), a moving cylinder (42), an upper fixed column (44), a lower fixed column (46), a rack (47), a mounting plate (48), and a fixed cylinder (49). The linkage frame (41) is fixedly installed on the top of the mating moving cylinder (42), the rotating moving ring (43) is bearing installed on the outer wall of the mating moving cylinder (42), the mating rack (47) is fixedly connected to the outer wall of the transmission shaft (3), and the mating moving cylinder (42) is movably sleeved on the outside of the mating rack (47); The upper fixed column (44) is installed at an equal angle on the outside of the rotating moving ring (43), the lower fixed column (46) is fixedly installed on the outside of the rotating shaft of the blade (6), and the bottom of the mounting plate (48) is fixedly connected to a protective cover, which rotates with the transmission shaft (3) and covers the outside of the angle adjustment mechanism (4) and the synchronization mechanism (7).

3. A large energy-saving fan with adjustable angle according to claim 2, characterized in that, The two ends of the connecting rod (45) are movably connected to the upper fixed column (44) and the lower fixed column (46) respectively through fisheye joint bearings. The mounting plate (48) is fixedly installed at the bottom end of the transmission shaft (3), and the fixing cylinder (49) is installed at equal distances on the outside of the mounting plate (48). The inner side of the fixing cylinder (49) is rotatably connected to the rotating shaft of the blade (6) through a bearing. One of the blades (6) has an encoder (10) mounted on one end of its shaft via a flexible coupling, and the encoder (10) is fixedly mounted inside the mounting plate (48). The angle detection unit is the encoder (10).

4. A large energy-saving fan with adjustable angle according to claim 2, characterized in that, The power mechanism (5) also includes a push-pull plate (52), a moving block (53), a slide (54), an inclined plate (55), a carriage (56), a limiting post (57), and a protective box (58); The protective box (58) is fixedly installed on the top of the frame (1), and the servo push rod (51) is fixedly installed on the top of the frame (1) and set inside the protective box (58); The push-pull plate (52) is fixedly installed at one end of the telescopic rod of the servo push rod (51), the moving block (53) is movably set at the top of the frame (1), the slide groove (54) is opened on one side of the moving block (53), the inclined plate (55) is fixedly connected to the top two sides of the linkage frame (41), and the inclined plate (55) is slidably set inside the slide groove (54).

5. A large energy-saving fan with adjustable angle according to claim 4, characterized in that, The slide (56) is fixedly connected to one side of the push-pull plate (52), the limiting post (57) is symmetrically installed on the top of the frame (1), and the slide (56) is slidably arranged on the outside of the limiting post (57) to restrict the horizontal movement of the moving block (53); The horizontal movement of the moving block (53) forces the linkage (41) to slide along the slide groove (54) and causes the linkage (41) to move up and down.

6. A large energy-saving fan with adjustable angle according to claim 1, characterized in that, The synchronization mechanism (7) includes a connecting frame (71), a fixed ring (72), a follower ring (73), a follower plate (74), a gear ring (75), a rotating column (76), a synchronization gear (77), a transmission bevel gear (78), and a shaft bevel gear (79). The connecting frame (71) is fixedly installed on one side of the frame (1), the fixing ring (72) is fixedly installed on the bottom inner side of the connecting frame (71), the follower ring (73) is rotatably installed inside the fixing ring (72) through a bearing, and the toothed ring (75) is rotatably installed inside the follower ring (73) through a bearing. The follower plate (74) is installed at equal intervals at the bottom of the follower ring (73), and the rotating column (76) is rotatably installed inside the follower plate (74) through a bearing.

7. A large energy-saving fan with adjustable angle according to claim 6, characterized in that, The synchronous gear (77) and the transmission bevel gear (78) are respectively fixedly installed at both ends of the rotating column (76), and the synchronous gear (77) meshes with the inner side of the gear ring (75). The transmission bevel gear (78) meshes with the shaft bevel gear (79), and the shaft bevel gear (79) is fixedly connected to the outer wall of the rotating shaft of the blade (6). When the shaft of the blade (6) is driven to rotate for angle adjustment, the shaft bevel gear (79) drives the transmission bevel gear (78) and the rotating column (76) to rotate, causing the synchronous gear (77) to drive the gear ring (75) to rotate, thereby driving multiple synchronous gears (77) to rotate simultaneously, forcing multiple blades (6) to adjust their angle synchronously.

8. A large energy-saving fan with adjustable angle according to claim 4, characterized in that, The protective box (58) is equipped with a self-locking mechanism (8) on its inner side. The self-locking mechanism (8) includes a toothed plate (81), a toothed block (82), a moving column (83), an armature ring (84), a plug column (85), a spring (86), and a ring electromagnet (87). The toothed plate (81) is fixedly connected to the inner top wall of the protective box (58), the toothed block (82) is engaged at the bottom of the toothed plate (81), the moving column (83) is fixedly connected to the bottom of the toothed block (82), and the armature ring (84) is fixedly connected to the bottom outer wall of the moving column (83). The insert (85) is fixedly connected to the bottom end of the movable column (83), and the insert (85) is inserted into the hollow ring of the annular electromagnet (87) to restrict the vertical movement of the movable column (83). The annular electromagnet (87) is fixedly installed on the top of the push-pull plate (52). The spring (86) is sleeved on the outside of the movable column (83), and the two ends of the spring (86) are fixedly installed with the tooth block (82) and the push-pull plate (52) respectively.

9. A large energy-saving fan with adjustable angle according to claim 8, characterized in that, When the annular electromagnet (87) is energized, it generates magnetic force and magnetically attracts the armature ring (84), forcing the tooth block (82) to separate from the tooth plate (81) to adjust the angle of the blade (6); When the annular electromagnet (87) is de-energized, the magnetic force disappears, and the armature ring (84) is elastically reset upward by the spring (86), so that the tooth block (82) engages with the tooth plate (81) to fix the adjustment angle of the blade (6).

10. A large energy-saving fan with adjustable angle according to claim 1, characterized in that, The outer wall of the drive shaft (3) is equipped with a limiting mechanism (9), and the limiting mechanism (9) includes an upper retaining ring (91) and a lower retaining ring (92). The upper retaining ring (91) and the lower retaining ring (92) are respectively set at both ends of the mating rack (47) to limit the moving distance of the mating moving cylinder (42) and force the blade (6) to rotate within a set range. The control module includes a PLC and a frequency converter. The PLC is connected to the frequency converter and is used to adjust the speed of the variable frequency motor (2). The PLC is configured to monitor the operating current of the servo push rod (51) and judge the health status of the blade (6) based on the current fluctuation.

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