EC centrifugal fan of 24V permanent magnet brushless direct current motor

Abstract

The invention belongs to the technical field of centrifugal fans, particularly relates to an EC centrifugal fan of a 24V permanent magnet brushless direct current motor, and provides the following scheme aiming at the problems that an existing traditional EC centrifugal fan is unreasonable in motor protection, difficult to maintain, insufficient in safety during equipment use and maintenance, lack of effective buffering and damping measures and the like. Comprising a fan shell, an air inlet is formed in one side of the fan shell, an air outlet is formed in the top of the fan shell, a wind wheel is rotationally arranged in the fan shell, and a connecting shaft is fixedly installed on one side of the wind wheel. The service life is prolonged, the performance is improved, and attractiveness and safety are achieved; the locking and electric control assembly is ingeniously designed, so that convenient maintenance and safe and rapid shutdown are realized, and the maintenance safety is guaranteed; and the buffer assembly reduces vibration and noise, and the durability and comfort of the equipment are enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal fans, and in particular to an EC centrifugal fan of a 24V permanent magnet brushless DC motor. Background Art

[0002] In the prior art, centrifugal fans are widely used in industrial, commercial and civil fields to provide ventilation and air exchange functions. In particular, EC (Electronically Commutated) centrifugal fans that use 24V permanent magnet brushless DC motors as drive sources have attracted widespread attention in the market due to their advantages such as high efficiency, energy saving and low noise. However, traditional EC centrifugal fans still have some shortcomings in design and use:

[0003] On the one hand, traditional EC centrifugal fans have defects in the use and maintenance of the drive motor. The drive motor is usually directly exposed to the external environment and is easily corroded by pollutants such as dust and moisture, which affects its service life and performance. In some centrifugal fans, key components such as the drive motor and belt are tightly installed inside the fan casing, which makes it difficult to disassemble and replace them when maintenance and repair are required. At the same time, some centrifugal fans are not convenient to quickly shut down and stop in an emergency, and they do not have structures such as power-off fuses, which is not conducive to the safe use and maintenance of the equipment.

[0004] On the other hand, traditional EC centrifugal fans also have deficiencies in buffering and shock absorption; the fan casing is usually directly fixed on the bottom bracket, lacking effective buffering and shock absorption measures, which causes the fan to easily generate vibration and noise during operation, which not only affects the service life of the equipment, but may also cause interference to the surrounding environment.

[0005] In view of the above problems, the present invention document proposes an EC centrifugal fan with a 24V permanent magnet brushless DC motor. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of traditional EC centrifugal fans in the prior art, such as unreasonable motor protection, difficult maintenance, insufficient safety during equipment use and maintenance, and lack of effective buffering and shock absorbing measures, and to propose an EC centrifugal fan with a 24V permanent magnet brushless DC motor.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] An EC centrifugal fan with a 24V permanent magnet brushless DC motor, comprising:

[0009] A fan housing, wherein an air inlet is provided on one side of the fan housing, an air outlet is provided on the top of the fan housing, a wind wheel is rotatably provided inside the fan housing, a connecting shaft is fixedly installed on one side of the wind wheel, and one end of the connecting shaft rotatably passes through one side of the fan housing and is fixedly installed with a first pulley;

[0010] It also includes a driving motor, a fixing plate is fixedly installed at the bottom of the driving motor, the fixing plate is fixedly installed on one side of the fan housing, one end of the output shaft of the driving motor is fixedly connected to a second pulley, and the second pulley is connected to the first pulley through a belt transmission to complete the rotation drive of the wind wheel;

[0011] It also includes a buffer assembly, which is used to support the fan housing and provide buffering for the fan housing;

[0012] It also includes a shielding cover, which is arranged on the top of the fixing plate, the driving motor is located in the shielding cover, a clearance groove is opened on one side of the shielding cover, the output shaft of the driving motor passes through the side of the shielding cover through the clearance groove, and the shielding cover is used to provide covering protection for the driving motor;

[0013] Also included is a locking assembly, which is used to lock the installed shielding cover;

[0014] It also includes an electric control component, which is used to quickly stop the drive motor.

[0015] The lock assembly comprises a locking box fixedly mounted on the top of the fixing plate, the locking box being fixedly mounted on the inside of the locking box, the outer wall of the guide rod being slidingly sleeved with a moving block, the moving block being slidably connected to the inside of the locking box, and one side of the moving block being fixedly mounted with two clamping posts, one end of which is slidably passed through one side of the locking box, the outer wall of the guide rod being sleeved with a second spring, one end of the second spring being fixedly connected to an inner wall of one side of the locking box, and the other end of the second spring being fixedly connected to one side of the moving block; a positioning frame is fixedly mounted on one side of the shielding cover, the positioning frame cooperates with the locking box, one end of the two clamping posts is passed through one side of the positioning frame; an adjusting slide slot is provided on one side of the locking box, and a dial block is provided on the outside of the locking box, one side of the dial block passes through the adjusting slide slot and is fixedly connected to one side of the moving block, the dial block is slidably connected to the inner wall of the adjusting slide slot, and the dial block is used to manually complete the movement of the moving block from the outside of the locking box.

[0016] In a possible design, two limit bars are fixedly installed on one side of the shielding cover, and two limit slide grooves are opened on one side of the fan housing. The two limit bars are slidably connected to the inner walls of the corresponding limit slide grooves for limiting the shielding cover in the horizontal direction.

[0017] In a possible design, the electric control component includes an electric control box fixedly installed on the top of the locking box, a fixed block fixedly installed inside the electric control box, a movable frame slidably connected to the bottom inner wall of the electric control box, one end of the movable frame slides through one side of the electric control box, the fixed block cooperates with the movable frame, and a metal contact is fixedly installed on one side of the contacting side of the two, the two metal contacts are electrically coordinated, and the same third spring is arranged between the fixed block and the movable frame, the third spring is located above the two metal contacts, one end of the third spring is fixedly connected to one side of the fixed block, and the other end of the third spring is fixedly connected to one side of the movable frame; when the two metal contacts are tightly attached to each other, the third spring is in a compressed state.

[0018] In a possible design, the electric control component also includes a lifting plate slidably arranged inside the electric control box, the lifting plate is located above the moving frame, a positioning rod is fixedly installed on the bottom of the lifting plate, a second positioning hole is opened on the top of the moving frame, the positioning rod slides through the second positioning hole, a fourth spring is fixedly installed on the top of the lifting plate, and the other end of the fourth spring is fixedly connected to the top inner wall of the electric control box; a protrusion is fixedly installed on one side of the lifting plate, and a fixed convex shell is provided on one side of the electric control box, the interior of the fixed convex shell is connected with the interior of the electric control box, the protrusion is slidably connected to the inner wall of the fixed convex shell, and an electric push rod is fixedly embedded in the bottom inner wall of the fixed convex shell, one end of the piston rod of the electric push rod abuts against the bottom of the protrusion, and the electric push rod is used to control the lifting and lowering of the lifting plate.

[0019] In a possible design, a first positioning hole is opened on the top of the moving block, and the first positioning hole cooperates with the second positioning hole. One end of the positioning rod slides through the bottom of the electric control box and the top of the locking box, and slidably cooperates with the inner wall of the first positioning hole to limit the movement of the moving block.

[0020] In a possible design, the buffer assembly includes a first support frame and a second support frame arranged below the fan housing, the second support frame is located below the first support frame, the first support frame is fixedly connected to the bottom of the fan housing, and a plurality of screws are slidably penetrated through the bottom of the second support frame, and the top ends of the plurality of screws are slidably penetrated through the first support frame; the outer walls of the plurality of screws are sleeved with a plurality of rubber pads, an abutment plate and a first spring, the plurality of rubber pads, the abutment plate and the first spring are all located between the first support frame and the second support frame, and the plurality of rubber pads are stacked in sequence, the abutment plate is located above the plurality of rubber pads, the first spring is located above the abutment plate, one end of the first spring is tightly attached to the top of the abutment plate, and the other end of the first spring is tightly attached to the bottom of the first support frame; the outer walls of the plurality of screws are threadedly sleeved with locking nuts, and the plurality of locking nuts are located above the first support frame for completing the positioning of the first support frame; the bottom ends of the plurality of screws are fixedly installed with supporting foot pads, the plurality of supporting foot pads are located below the second support frame, and the plurality of supporting foot pads are used to complete the support of the equipment.

[0021] In a possible design, a belt protection shell is provided on one side of the fan housing, and the belt protection shell is located outside the first pulley, the second pulley and the corresponding belts, and is used to cover and protect the first pulley, the second pulley and the corresponding belts.

[0022] Beneficial effects: In the present invention, the EC centrifugal fan of the 24V permanent magnet brushless DC motor provides effective covering protection for the driving motor by setting a shielding cover, thereby preventing the motor from being corroded by pollutants such as dust and moisture, and extending the service life and performance of the motor. At the same time, the setting of the shielding cover also increases the aesthetics and safety of the equipment.

[0023] In the present invention, the EC centrifugal fan of the 24V permanent magnet brushless DC motor realizes convenient locking of the shielding cover and rapid stopping of the driving motor by setting a locking component and an electric control component; when maintenance and overhaul are required, the user can conveniently disassemble the shielding cover and overhaul the driving motor; when the equipment needs to be stopped urgently, the user can quickly cut off the power supply by controlling the electric control component to ensure the safe operation of the equipment;

[0024] In the present invention, the EC centrifugal fan of the 24V permanent magnet brushless DC motor can ensure that the equipment cannot be disassembled and maintained before the circuit connection of the electric control component is cut off by setting the locking component and the electric control component, which is conducive to ensuring better safety during motor maintenance and protecting the safety of maintenance personnel;

[0025] In the present invention, the EC centrifugal fan of the 24V permanent magnet brushless DC motor provides effective buffering and shock absorption measures for the fan housing by setting a buffer component, thereby reducing the vibration and noise of the fan during operation and improving the service life and comfort of the equipment;

[0026] In the present invention, the EC centrifugal fan of the 24V permanent magnet brushless DC motor covers and protects the first pulley, the second pulley and the corresponding belt by providing a belt protection shell, thereby preventing the belt from wearing and loosening during long-term operation, and improving the transmission efficiency and stability;

[0027] In the present invention, the EC centrifugal fan of the 24V permanent magnet brushless DC motor effectively protects the driving motor through the shielding cover, prolongs the service life and improves the performance, and has both aesthetics and safety; the ingenious design of the locking and electronic control components realizes convenient maintenance and safe and rapid shutdown, ensuring the safety of maintenance; the buffer component reduces vibration and noise, and enhances the durability and comfort of the equipment; in summary, the present invention significantly optimizes the performance, safety, maintenance convenience and environmental adaptability of the centrifugal fan, and effectively improves the comfort and convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A three-dimensional structural schematic diagram of an EC centrifugal fan with a 24V permanent magnet brushless DC motor proposed in the present invention;

[0029] Figure 2 A schematic diagram of the three-dimensional structure of an EC centrifugal fan with a 24V permanent magnet brushless DC motor proposed by the present invention from another perspective;

[0030] Figure 3 A schematic diagram of the structure of a buffer assembly of an EC centrifugal fan of a 24V permanent magnet brushless DC motor proposed by the present invention;

[0031] Figure 4 This is a schematic diagram of the disassembled structure of an EC centrifugal fan with a 24V permanent magnet brushless DC motor proposed by the present invention;

[0032] Figure 5 This is a schematic diagram of the installation structure of a shielding cover of an EC centrifugal fan of a 24V permanent magnet brushless DC motor proposed by the present invention;

[0033] Figure 6 This is a schematic cross-sectional view of the locking assembly and the electric control assembly of an EC centrifugal fan of a 24V permanent magnet brushless DC motor proposed by the present invention;

[0034] Figure 7 A schematic diagram of the split structure of a locking component and an electronic control component of an EC centrifugal fan of a 24V permanent magnet brushless DC motor proposed in the present invention.

[0035] In the figure: 1. fan housing; 2. first support frame; 3. second support frame; 4. air inlet; 5. air outlet; 6. fixing plate; 7. shielding cover; 8. belt protection shell; 9. screw; 10. support foot pad; 11. rubber pad; 12. abutment plate; 13. first spring; 14. locking nut; 15. wind wheel; 16. connecting shaft; 17. driving motor; 18. first pulley; 19. second pulley; 20. limit strip; 21. limit slide; 22. 1. Make way slot; 23. Positioning frame; 24. Locking box; 25. Electric control box; 26. Guide rod; 27. Moving block; 28. Clamping column; 29. ​​Second spring; 30. First positioning hole; 31. Fixed block; 32. Metal contact piece; 33. Moving frame; 34. Third spring; 35. Lifting plate; 36. Positioning rod; 37. Fourth spring; 38. Bump; 39. Fixed convex shell; 40. Electric push rod; 41. Second positioning hole; 42. Adjusting slide groove; 43. Shifting block. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0037] Example 1: Reference Figure 1-7 , an EC centrifugal fan, comprising:

[0038] The fan housing 1 has an air inlet 4 on one side and an air outlet 5 on the top. A fan wheel 15 is rotatably arranged inside the fan housing 1, a connecting shaft 16 is fixedly installed on one side of the fan wheel 15, and one end of the connecting shaft 16 rotatably passes through one side of the fan housing 1 and is fixedly installed with a first pulley 18.

[0039] The fan housing 1 further comprises a driving motor 17, a fixing plate 6 is fixedly mounted on the bottom of the driving motor 17, and the fixing plate 6 is fixedly mounted on one side of the fan housing 1. A second belt pulley 19 is fixedly connected to one end of the output shaft of the driving motor 17, and the second belt pulley 19 is connected to the first belt pulley 18 through a belt transmission to complete the rotation driving of the wind wheel 15.

[0040] In this embodiment, a buffer assembly is also included, which is used to support the fan housing 1 and provide buffering for the fan housing 1. The buffer assembly includes a first support frame 2 and a second support frame 3 arranged below the fan housing 1, the second support frame 3 is located below the first support frame 2, and the first support frame 2 is fixedly connected to the bottom of the fan housing 1. A plurality of screws 9 are slidably penetrated through the bottom of the second support frame 3, and the tops of the plurality of screws 9 are all slidably penetrated through the first support frame 2. The outer walls of the plurality of screws 9 are all sleeved with a plurality of rubber pads 11, an abutment plate 12 and a first spring 13, and the plurality of rubber pads 11, an abutment plate 12 and a first spring 13 are all located between the first support frame 2 and the second support frame 3. The plurality of rubber pads 11 are stacked in sequence, the abutment plate 12 is located above the plurality of rubber pads 11, the first spring 13 is located above the abutment plate 12, one end of the first spring 13 is in close contact with the top of the abutment plate 12, and the other end of the first spring 13 is in close contact with the bottom of the first support frame 2. The outer walls of the multiple screw rods 9 are all threadedly sleeved with locking nuts 14, and the multiple locking nuts 14 are all located above the first support frame 2, and are used to complete the positioning of the first support frame 2. The bottom ends of the multiple screw rods 9 are all fixedly installed with supporting pads 10, and the multiple supporting pads 10 are all located below the second support frame 3, and the multiple supporting pads 10 are used to complete the support of the equipment.

[0041] The shielding cover 7 is also included, and the shielding cover 7 is arranged on the top of the fixing plate 6. The driving motor 17 is located in the shielding cover 7. A clearance groove 22 is opened on one side of the shielding cover 7, and the output shaft of the driving motor 17 passes through the clearance groove 22 and penetrates one side of the shielding cover 7. The shielding cover 7 is used to provide covering protection for the driving motor 17.

[0042] In this embodiment, a locking assembly is also included, and the locking assembly is used to lock the installed shielding cover 7. The locking assembly includes a locking box 24 fixedly installed on the top of the fixing plate 6, and a guide rod 26 is fixedly installed inside the locking box 24. The outer wall of the guide rod 26 is slidably sleeved with a moving block 27, and the moving block 27 is slidably connected to the inside of the locking box 24. Two clamping columns 28 are fixedly installed on one side of the moving block 27, and one end of the two clamping columns 28 slides through one side of the locking box 24. The outer wall of the guide rod 26 is sleeved with a second spring 29, and one end of the second spring 29 is fixedly connected to the inner wall of one side of the locking box 24, and the other end of the second spring 29 is fixedly connected to one side of the moving block 27. A positioning frame 23 is fixedly installed on one side of the shielding cover 7, and the positioning frame 23 cooperates with the locking box 24, and one end of the two clamping columns 28 penetrates one side of the positioning frame 23. An adjustment slot 42 is provided on one side of the locking box 24, and a shift block 43 is provided on the outside of the locking box 24. One side of the shift block 43 passes through the adjustment slot 42 and is fixedly connected to one side of the moving block 27. The shift block 43 is slidably connected to the inner wall of the adjustment slot 42. The shift block 43 is used to manually complete the movement of the moving block 27 from the outside of the locking box 24.

[0043] Furthermore, in this embodiment, two limit strips 20 are fixedly installed on one side of the shielding cover 7, and two limit slide grooves 21 are opened on one side of the fan casing 1. The two limit strips 20 are slidably connected to the inner walls of the corresponding limit slide grooves 21, and are used to limit the shielding cover 7 in the horizontal direction.

[0044] In this embodiment, an electric control component is also included, and the electric control component is used to complete the rapid stop of the drive motor 17. The electric control component includes an electric control box 25 fixedly installed on the top of the locking box 24, a fixed block 31 is fixedly installed inside the electric control box 25, and a moving frame 33 is slidably connected to the bottom inner wall of the electric control box 25. One end of the moving frame 33 slides through one side of the electric control box 25, and the fixed block 31 cooperates with the moving frame 33, and a metal contact piece 32 is fixedly installed on the side where the two contact each other, and the two metal contacts 32 are electrically matched. The same third spring 34 is arranged between the fixed block 31 and the moving frame 33, and the third spring 34 is located above the two metal contacts 32. One end of the third spring 34 is fixedly connected to one side of the fixed block 31, and the other end of the third spring 34 is fixedly connected to one side of the moving frame 33. When the two metal contacts 32 are in close contact, the third spring 34 is in a compressed state.

[0045] Furthermore, in this embodiment, the electric control assembly further includes a lifting plate 35 slidably disposed inside the electric control box 25, the lifting plate 35 is located above the moving frame 33, a positioning rod 36 is fixedly installed at the bottom of the lifting plate 35, a second positioning hole 41 is opened at the top of the moving frame 33, and the positioning rod 36 slides through the second positioning hole 41. A fourth spring 37 is fixedly installed at the top of the lifting plate 35, and the other end of the fourth spring 37 is fixedly connected to the top inner wall of the electric control box 25. A convex block 38 is fixedly installed on one side of the lifting plate 35, and a fixed convex shell 39 is provided on one side of the electric control box 25, the interior of the fixed convex shell 39 is connected to the interior of the electric control box 25, and the convex block 38 is slidably connected to the inner wall of the fixed convex shell 39. An electric push rod 40 is fixedly embedded in the bottom inner wall of the fixed convex shell 39, and one end of the piston rod of the electric push rod 40 abuts against the bottom of the convex block 38, and the electric push rod 40 is used to control the lifting and lowering of the lifting plate 35.

[0046] The present application can be used in the field of centrifugal fan technology, and can also be used in other fields applicable to the present application.

[0047] Example 2: Reference Figure 1 , 2 6. Improvement on the basis of Example 1: an EC centrifugal fan of a 24V permanent magnet brushless DC motor, which is applied to the field of centrifugal fan technology;

[0048] In this embodiment, a belt protection shell 8 is provided on one side of the fan housing 1. The belt protection shell 8 is located outside the first pulley 18, the second pulley 19 and the corresponding belts, and is used to cover and protect the first pulley 18, the second pulley 19 and the corresponding belts.

[0049] In this embodiment, a first positioning hole 30 is formed on the top of the moving block 27, and the first positioning hole 30 matches with the second positioning hole 41. One end of the positioning rod 36 slides through the bottom of the electric control box 25 and the top of the locking box 24, and slides with the inner wall of the first positioning hole 30 to limit the movement of the moving block 27.

[0050] In this embodiment, one of the two metal contact pieces 32 is electrically connected to the drive motor 17 , and the other metal contact piece 32 is electrically connected to the external power source.

[0051] In this embodiment, a plurality of through holes are provided on the top of the shielding cover 7 to ensure a better heat dissipation effect of the driving motor 17 therein.

[0052] However, as is well known to those skilled in the art, the working principle and wiring method of the drive motor 17 are commonplace, and are conventional means or common knowledge, and will not be elaborated here. Those skilled in the art may make any selection according to their needs or convenience.

[0053] The working principle and usage process of this technical solution are as follows:

[0054] When in use, the user needs to complete the assembly of the fan housing 1 and the bottom bracket first; during installation, the user needs to pass multiple screw rods 9 equipped with supporting foot pads 10 from the bottom of the second support frame 3 through the second support frame 3, and then the user needs to sequentially sleeve multiple rubber pads 11, abutment plates 12 and first springs 13 on multiple screw rods 9, and then the user can place the first support frame 2 equipped with the fan housing 1 on top of the second support frame 3, and ensure that multiple screw rods 9 can all pass through the first support frame 2, and then use multiple locking nuts 14 to screw on multiple screw rods 9, and multiple locking nuts 14 can limit the position of the first support frame 2; when tightening the locking nuts 14, it should be avoided that the first support frame 2 compresses the first spring 13 too strongly to ensure that the first spring 13 still has sufficient rebound performance, thereby ensuring a better buffering effect on the equipment; after the installation is completed, the user can use the external pipe to connect with the air outlet 5, and then start the drive motor 17, and the wind wheel 15 can be driven to rotate through the transmission of the second pulley 19 and the first pulley 18, so as to transport wind power;

[0055] When the equipment needs to be stopped urgently, the user can control the piston rod of the electric push rod 40 to push out, and the electric push rod 40 can push the lifting plate 35 to move up. When the positioning rod 36 at the bottom of the lifting plate 35 moves to a state of being out of the second positioning hole 41, under the action of the third spring 34, the moving frame 33 will quickly move away from the fixed block 31, and one end of it will pop out toward the outside of the electric control box 25. At this time, the two metal contact pieces 32 will also separate, and then the power-off stop of the drive motor 17 can be completed, which is conducive to quickly responding to the occurrence of emergencies;

[0056] When the equipment needs maintenance, the user can inspect the drive motor 17 by removing the shielding cover 7; under normal circumstances, since one end of the positioning rod 36 is continuously inserted into the first positioning hole 30, the moving block 27 cannot move; when removing the shielding cover 7, the user should follow the above operation to complete the ejection of the moving frame 33, thereby separating the two metal contacts 32. At this time, the positioning rod 36 cannot extend into the locking box 24 due to the obstruction of the moving frame 33, so the moving block 27 can be moved and unlocked normally. At the same time, since the drive motor 17 is powered off at this time, the user will be safer when operating; when the user is removing the shielding cover 7, he only needs to toggle the dial block 43 externally, and the moving block 27 can move synchronously at this time until the two clamping columns 28 are separated from the positioning frame 23, and the shielding cover 7 can be slid upward and taken out;

[0057] When the user has completed the inspection, the user should perform the above operations in reverse, first complete the installation of the shielding cover 7, and under the action of the second spring 29, make the two clamping columns 28 pass through the preset holes to penetrate the positioning frame 23, thereby completing the locking of the shielding cover 7; thereafter, the user can push the end of the movable frame 33 exposed to the outside of the electric control box 25 while ensuring that the electric push rod 40 has retracted the piston rod, until the second positioning hole 41 moves to align with the positioning rod 36, at this time the lifting plate 35 can continue to move downward under the action of the fourth spring 37, the positioning rod 36 will quickly pass through the second positioning hole 41 and be inserted into the first positioning hole 30, to complete the locking and positioning of the movable block 27, and at this time the two metal contacts 32 will also be tightly attached again, thereby completing the connection of the drive motor 17 circuit, ensuring that it can work normally in the future.

[0058] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An EC centrifugal fan with a 24V permanent magnet brushless DC motor, characterized in that: include: A fan housing (1), wherein an air inlet (4) is provided on one side of the fan housing (1), an air outlet (5) is provided on the top of the fan housing (1), a wind wheel (15) is rotatably arranged inside the fan housing (1), a connecting shaft (16) is fixedly installed on one side of the wind wheel (15), and one end of the connecting shaft (16) rotatably passes through one side of the fan housing (1) and is fixedly installed with a first pulley (18); It also includes a driving motor (17), a fixing plate (6) is fixedly mounted on the bottom of the driving motor (17), the fixing plate (6) is fixedly mounted on one side of the fan housing (1), one end of the output shaft of the driving motor (17) is fixedly connected to a second belt pulley (19), and the second belt pulley (19) and the first belt pulley (18) are connected via a belt transmission to complete the rotational drive of the wind wheel (15); It also includes a buffer component, which is used to support the fan housing (1) and provide buffering for the fan housing (1); The device also comprises a shielding cover (7), wherein the shielding cover (7) is arranged on the top of the fixing plate (6), the driving motor (17) is located in the shielding cover (7), a clearance groove (22) is provided on one side of the shielding cover (7), an output shaft of the driving motor (17) passes through one side of the shielding cover (7) through the clearance groove (22), and the shielding cover (7) is used to provide shielding protection for the driving motor (17); It also comprises a locking assembly, which is used to lock the installed shielding cover (7); It also includes an electric control component, which is used to quickly stop the drive motor (17).

2. The EC centrifugal fan of a 24V permanent magnet brushless DC motor according to claim 1, characterized in that: The locking assembly comprises a locking box (24) fixedly mounted on the top of the fixing plate (6); a guide rod (26) is fixedly mounted inside the locking box (24); a moving block (27) is slidably sleeved on the outer wall of the guide rod (26); the moving block (27) is slidably connected to the inside of the locking box (24); two clamping columns (28) are fixedly mounted on one side of the moving block (27); one end of the two clamping columns (28) slides through one side of the locking box (24); a second spring (29) is sleeved on the outer wall of the guide rod (26); one end of the second spring (29) is fixedly connected to the inner wall of one side of the locking box (24); the other end of the second spring (29) is slidably sleeved on the inner wall of the moving block (27); two clamping columns (28) are fixedly mounted on one side of the moving block (27); one end of the two clamping columns (28) slides through one side of the locking box (24); One side of the moving block (27) is fixedly connected; one side of the shielding cover (7) is fixedly installed with a positioning frame (23), the positioning frame (23) cooperates with the locking box (24), and one end of the two clamping columns (28) passes through one side of the positioning frame (23); one side of the locking box (24) is provided with an adjusting slide groove (42), and the outside of the locking box (24) is provided with a shifting block (43), one side of the shifting block (43) passes through the adjusting slide groove (42) and is fixedly connected to one side of the moving block (27), the shifting block (43) is slidably connected to the inner wall of the adjusting slide groove (42), and the shifting block (43) is used to manually complete the movement of the moving block (27) from the outside of the locking box (24).

3. The EC centrifugal fan of a 24V permanent magnet brushless DC motor according to claim 2, characterized in that: Two limit bars (20) are fixedly mounted on one side of the shielding cover (7), and two limit sliding grooves (21) are provided on one side of the fan housing (1). The two limit bars (20) are slidably connected to the inner walls of the corresponding limit sliding grooves (21) for limiting the shielding cover (7) in the horizontal direction.

4. The EC centrifugal fan of a 24V permanent magnet brushless DC motor according to claim 2, characterized in that: The electric control assembly comprises an electric control box (25) fixedly mounted on the top of the locking box (24), a fixed block (31) fixedly mounted inside the electric control box (25), a movable frame (33) slidably connected to the inner wall of the bottom of the electric control box (25), one end of the movable frame (33) slidably passes through one side of the electric control box (25), the fixed block (31) cooperates with the movable frame (33), and a metal contact piece (32) is fixedly mounted on one side of the two contact pieces, the two metal contact pieces (32) are electrically matched, a third spring (34) is arranged between the fixed block (31) and the movable frame (33), the third spring (34) is located above the two metal contact pieces (32), one end of the third spring (34) is fixedly connected to one side of the fixed block (31), and the other end of the third spring (34) is fixedly connected to one side of the movable frame (33); when the two metal contact pieces (32) are in close contact with each other, the third spring (34) is in a compressed state.

5. The EC centrifugal fan of a 24V permanent magnet brushless DC motor according to claim 4, characterized in that: The electric control assembly also includes a lifting plate (35) slidably arranged inside the electric control box (25), the lifting plate (35) is located above the moving frame (33), a positioning rod (36) is fixedly installed at the bottom of the lifting plate (35), a second positioning hole (41) is opened at the top of the moving frame (33), the positioning rod (36) slides through the second positioning hole (41), a fourth spring (37) is fixedly installed at the top of the lifting plate (35), and the other end of the fourth spring (37) is fixedly connected to the top inner wall of the electric control box (25); A convex block (38) is fixedly mounted on one side of the lifting plate (35), a fixed convex shell (39) is provided on one side of the electric control box (25), the interior of the fixed convex shell (39) is connected to the interior of the electric control box (25), the convex block (38) is slidably connected to the inner wall of the fixed convex shell (39), an electric push rod (40) is fixedly embedded in the bottom inner wall of the fixed convex shell (39), one end of the piston rod of the electric push rod (40) is in contact with the bottom of the convex block (38), and the electric push rod (40) is used to control the lifting and lowering of the lifting plate (35).

6. The EC centrifugal fan of a 24V permanent magnet brushless DC motor according to claim 5, characterized in that: A first positioning hole (30) is provided at the top of the moving block (27), and the first positioning hole (30) cooperates with the second positioning hole (41). One end of the positioning rod (36) slides through the bottom of the electric control box (25) and the top of the locking box (24), and slides with the inner wall of the first positioning hole (30), so as to limit the movement of the moving block (27).

7. The EC centrifugal fan of a 24V permanent magnet brushless DC motor according to claim 1, characterized in that: The buffer assembly comprises a first support frame (2) and a second support frame (3) which are arranged below the fan housing (1); the second support frame (3) is located below the first support frame (2); the first support frame (2) is fixedly connected to the bottom of the fan housing (1); a plurality of screw rods (9) are slidably penetrated through the bottom of the second support frame (3); the top ends of the plurality of screw rods (9) are slidably penetrated through the first support frame (2); the outer walls of the plurality of screw rods (9) are sleeved with a plurality of rubber pads (11), an abutment plate (12) and a first spring (13); the plurality of rubber pads (11), the abutment plate (12) and the first spring (13) are located between the first support frame (2) and the second support frame (3); the plurality of rubber pads (11) ) are stacked in sequence, the abutment plate (12) is located above the plurality of rubber pads (11), the first spring (13) is located above the abutment plate (12), one end of the first spring (13) is tightly attached to the top of the abutment plate (12), and the other end of the first spring (13) is tightly attached to the bottom of the first support frame (2); the outer walls of the plurality of screw rods (9) are threadedly sleeved with locking nuts (14), and the plurality of locking nuts (14) are located above the first support frame (2) for completing the positioning of the first support frame (2); the bottom ends of the plurality of screw rods (9) are fixedly installed with supporting foot pads (10), and the plurality of supporting foot pads (10) are located below the second support frame (3), and the plurality of supporting foot pads (10) are used to complete the support of the equipment.

8. The EC centrifugal fan of a 24V permanent magnet brushless DC motor according to claim 1, characterized in that: A belt protection shell (8) is provided on one side of the fan housing (1); the belt protection shell (8) is located outside the first belt pulley (18), the second belt pulley (19) and the corresponding belts, and is used to cover and protect the first belt pulley (18), the second belt pulley (19) and the corresponding belts.

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