An EC centrifugal fan for a 24V permanent magnet brushless DC motor

Abstract

The present invention belongs to the technical field of centrifugal fans, and in particular to an EC centrifugal fan with a 24V permanent magnet brushless DC motor. Aiming at the problems existing in the existing traditional EC centrifugal fans, such as unreasonable protection of the motor, difficult maintenance, insufficient safety during equipment use and maintenance, and lack of effective buffer and shock absorption measures, the following solutions are proposed. It includes a fan housing, 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 arranged inside the fan housing, and a connecting shaft is fixedly installed on one side of the wind wheel. In the present invention, the EC centrifugal fan with a 24V permanent magnet brushless DC motor effectively protects the drive motor through a shielding cover, extends the service life and improves the performance, and combines beauty and safety; the ingenious design of the locking and electric 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.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal fans, and particularly to an EC centrifugal fan with 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. Especially in EC (Electronically Commutated) centrifugal fans using a 24V permanent magnet brushless DC motor as the drive source, due to the advantages of high efficiency, energy saving, and low noise of the motor, they have received extensive attention in the market. However, there are still some deficiencies in the design and use of traditional EC centrifugal fans:

[0003] On the one hand, there are defects in the use and maintenance of the drive motor in traditional EC centrifugal fans; the drive motor is usually directly exposed to the external environment and is easily eroded by pollutants such as dust and moisture, thus affecting its service life and performance; in some centrifugal fans, key components such as the drive motor and belt are tightly installed inside the fan housing, which makes it difficult to disassemble and replace them when maintenance and repair are required; at the same time, some centrifugal fans are inconvenient to quickly cut off power and stop in case of emergency, and they do not have a power-off insurance structure, 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 housing is usually directly fixed on the bottom bracket, lacking effective buffering and shock absorption measures, resulting in the fan being prone to vibration and noise during operation, which not only affects the service life of the equipment but also may 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 problems existing in the prior art, such as the unreasonable protection of the motor, difficult maintenance, insufficient safety during the use and maintenance of the equipment, and the lack of effective buffering and shock absorption measures in traditional EC centrifugal fans, and to propose an EC centrifugal fan with a 24V permanent magnet brushless DC motor.

[0007] To achieve the above purpose, 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 is fixedly installed inside the electric control box. A movable frame is slidably connected to the bottom inner wall of the electric control box. One end of the movable frame slidably penetrates through one side of the electric control box. The fixed block cooperates with the movable frame, and metal contacts are fixedly installed on one side of each of them in contact. The two metal contacts are electrically cooperated. A 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 in close contact, the third spring is in a compressed state.

[0018] In a possible design, the electric control component further includes a lifting plate slidably arranged inside the electric control box. The lifting plate is located above the movable frame. A positioning rod is fixedly installed at the bottom of the lifting plate. A second positioning hole is formed in the top of the movable frame. The positioning rod slidably penetrates through the second positioning hole. A fourth spring is fixedly installed at the top of the lifting plate. The other end of the fourth spring is fixedly connected to the top inner wall of the electric control box. A convex block is fixedly installed on one side of the lifting plate. A fixed convex shell is arranged on one side of the electric control box. The inside of the fixed convex shell is communicated with the inside of the electric control box. The convex block is slidably connected to the inner wall of the fixed convex shell. 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 convex block. The electric push rod is used to control the lifting of the lifting plate.

[0019] In a possible design, a first positioning hole is formed in the top of the movable block. The first positioning hole cooperates with the second positioning hole. One end of the positioning rod slidably penetrates through the bottom of the electric control box and the top of the locking box, and is slidably fitted with the inner wall of the first positioning hole to limit the movement of the movable block.

[0020] In a possible design, the buffer assembly includes a first support frame and a second support frame disposed below the blower housing. The second support frame is located below the first support frame. The first support frame is fixedly connected to the bottom of the blower housing. A plurality of screw rods slidably penetrate through the bottom of the second support frame, and the tops of the plurality of screw rods all slidably penetrate through the first support frame. A plurality of rubber pads, a butting plate, and a first spring are sleeved on the outer walls of the plurality of screw rods. The plurality of rubber pads, the butting plate, and the first spring are all located between the first support frame and the second support frame. The plurality of rubber pads are stacked in sequence. The butting plate is located above the plurality of rubber pads, and the first spring is located above the butting plate. One end of the first spring is closely attached to the top of the butting plate, and the other end of the first spring is closely attached to the bottom of the first support frame. Locking nuts are threadedly sleeved on the outer walls of the plurality of screw rods, and the plurality of locking nuts are all located above the first support frame for positioning the first support frame. Support foot pads are fixedly installed at the bottom ends of the plurality of screw rods, and the plurality of support foot pads are all located below the second support frame. The plurality of support foot pads are used to support the equipment.

[0021] In a possible design, a belt protection cover is provided on one side of the blower housing. The belt protection cover is located outside the first pulley, the second pulley, and the corresponding belt for covering and protecting the first pulley, the second pulley, and the corresponding belt.

[0022] Beneficial effects: In the present invention, for the EC centrifugal blower of the 24V permanent magnet brushless DC motor, by providing a shielding cover, effective covering protection is provided for the drive motor, avoiding the erosion of pollutants such as dust and moisture on the motor, 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, for the EC centrifugal blower of the 24V permanent magnet brushless DC motor, by providing a locking assembly and an electric control assembly, convenient locking of the shielding cover and rapid stop of the drive motor are achieved; when maintenance and repair are required, the user can conveniently disassemble the shielding cover and repair the drive motor; when it is necessary to stop the equipment emergently, the user can quickly cut off the power supply by controlling the electric control assembly to ensure the safe operation of the equipment;

[0024] In the present invention, for the EC centrifugal blower of the 24V permanent magnet brushless DC motor, through the combined use of the locking assembly and the electric control assembly, it can be ensured that the equipment cannot be disassembled and maintained before the circuit connection of the electric control assembly is cut off, which is beneficial to ensuring good safety during motor maintenance and ensuring the safety of maintenance personnel;

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

[0026] In the present invention, for the EC centrifugal fan of a 24V permanent magnet brushless DC motor, by providing a belt protection cover, the first pulley, the second pulley and the corresponding belt are covered and protected, preventing the wear and looseness of the belt 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 drive motor through a shielding cover, extends the service life and improves the performance, combining 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 assembly reduces vibration and noise, enhancing 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, effectively improving the use comfort and convenience. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

[0033] Figure 6 is a sectional structure schematic diagram of the locking component and the electronic control component of an EC centrifugal fan of a 24V permanent magnet brushless DC motor proposed by the present invention;

[0034] Figure 7 is a disassembled structure schematic diagram of the locking component and the electronic control component of an EC centrifugal fan of a 24V permanent magnet brushless DC motor proposed by 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 housing; 9, screw; 10, support foot pad; 11, rubber pad; 12, abutting plate; 13, first spring; 14, locking nut; 15, wind wheel; 16, connecting shaft; 17, drive motor; 18, first pulley; 19, second pulley; 20, limiting strip; 21, limiting chute; 22, relief groove; 23, positioning frame; 24, locking box; 25, electric control box; 26, guide rod; 27, moving block; 28, clamping post; 29, second spring; 30, first positioning hole; 31, fixing block; 32, metal contact; 33, moving frame; 34, third spring; 35, lifting plate; 36, positioning rod; 37, fourth spring; 38, convex block; 39, fixed convex housing; 40, electric push rod; 41, second positioning hole; 42, adjusting chute; 43, dialing block. Specific embodiments

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

[0037] Example 1: Refer to Figure 1-7 , an EC centrifugal fan, including:

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

[0039] It further includes a drive motor 17. The bottom of the drive motor 17 is fixedly installed with a fixing plate 6, and the fixing plate 6 is fixedly installed on one side of the fan housing 1. One end of the output shaft of the drive motor 17 is fixedly connected with a second pulley 19. The second pulley 19 and the first pulley 18 are connected by belt transmission to complete the rotational drive of the wind wheel 15.

[0040] In this embodiment, a buffer assembly is further included. The buffer assembly 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 disposed 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 screw rods 9 slidably penetrate through the bottom of the second support frame 3, and the tops of the plurality of screw rods 9 all slidably penetrate through the first support frame 2. A plurality of rubber pads 11, a butting plate 12 and a first spring 13 are sleeved on the outer walls of the plurality of screw rods 9. The plurality of rubber pads 11, a butting 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 butting plate 12 is located above the plurality of rubber pads 11, and the first spring 13 is located above the butting plate 12. One end of the first spring 13 is closely attached to the top of the butting plate 12, and the other end of the first spring 13 is closely attached to the bottom of the first support frame 2. Locking nuts 14 are threadedly sleeved on the outer walls of the plurality of screw rods 9. The plurality of locking nuts 14 are all located above the first support frame 2 and are used to position the first support frame 2. Support feet pads 10 are fixedly installed at the bottom ends of the plurality of screw rods 9. The plurality of support feet pads 10 are all located below the second support frame 3, and the plurality of support feet pads 10 are used to support the equipment.

[0041] A shielding cover 7 is further included. The shielding cover 7 is disposed on the top of the fixing plate 6, and the driving motor 17 is located inside the shielding cover 7. A relief groove 22 is formed on one side of the shielding cover 7. The output shaft of the driving motor 17 penetrates through one side of the shielding cover 7 through the relief groove 22. The shielding cover 7 is used to provide covering protection for the driving motor 17.

[0042] In this embodiment, a locking assembly is further included. 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. A guide rod 26 is fixedly installed inside the locking box 24. A moving block 27 is slidably sleeved on the outer wall of the guide rod 26, 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. One ends of the two clamping columns 28 all slidably penetrate 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, 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. The positioning frame 23 cooperates with the locking box 24, and one ends of the two clamping columns 28 all penetrate through one side of the positioning frame 23. An adjustment sliding groove 42 is formed on one side of the locking box 24. A dial block 43 is disposed outside the locking box 24. One side of the dial block 43 penetrates through the adjustment sliding groove 42 and is fixedly connected to one side of the moving block 27. The dial block 43 is slidably connected to the inner wall of the adjustment sliding groove 42. The dial block 43 is used to manually move the moving block 27 from outside the locking box 24.

[0043] Further, in this embodiment, two limiting strips 20 are fixedly installed on one side of the shielding cover 7, two limiting sliding grooves 21 are opened on one side of the fan housing 1, and both of the two limiting strips 20 are slidably connected to the inner wall of the corresponding limiting sliding groove 21 for limiting the shielding cover 7 in the horizontal direction.

[0044] In this embodiment, it further includes an electric control component for quickly stopping the driving motor 17. The electric control component includes an electric control box 25 fixedly installed on the top of the locking box 24. A fixing block 31 is fixedly installed inside the electric control box 25. A moving frame 33 is slidably connected to the inner bottom wall of the electric control box 25. One end of the moving frame 33 slidably penetrates through one side of the electric control box 25. The fixing block 31 cooperates with the moving frame 33, and metal contact pieces 32 are fixedly installed on the side where they contact each other. The two metal contact pieces 32 are electrically matched. A same third spring 34 is arranged between the fixing block 31 and the moving 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 fixing 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 contact pieces 32 are in close contact, the third spring 34 is in a compressed state.

[0045] Further, in this embodiment, the electric control component further 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 slidably penetrates through the second positioning hole 41. A fourth spring 37 is fixedly installed at the top of the lifting plate 35. The other end of the fourth spring 37 is fixedly connected to the inner top wall of the electric control box 25. A convex block 38 is fixedly installed on one side of the lifting plate 35. A fixed convex shell 39 is arranged on one side of the electric control box 25. The inside of the fixed convex shell 39 is communicated with the inside 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 inner bottom wall of the fixed convex shell 39. One end of the piston rod of the electric push rod 40 abuts against the bottom of the convex block 38. The electric push rod 40 is used to control the lifting of the lifting plate 35.

[0046] This application can be used in the technical field of centrifugal fans and can also be used in other fields applicable to this application.

[0047] Embodiment 2: Refer to Figure 1 、 2 、6, on the basis of Embodiment 1, an improved EC centrifugal fan of a 24V permanent magnet brushless DC motor is applied to the technical field of centrifugal fans;

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

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

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

[0051] In this embodiment, a plurality of through holes are formed at the top of the shielding cover 7 to ensure better heat dissipation of the drive motor 17 inside it.

[0052] However, as is well known to those skilled in the art, the working principle and wiring method of the drive motor 17 are common knowledge, and they all belong to conventional means or well-known common sense, so they will not be elaborated here. Those skilled in the art can make arbitrary selections 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 first complete the assembly of the fan housing 1 and the bottom bracket; during installation, the user needs to pass a plurality of screws 9 equipped with support foot pads 10 through the bottom of the second support frame 3, and then the user needs to sleeved a plurality of rubber pads 11, abutting plates 12 and first springs 13 on the plurality of screws 9 in sequence. Then the user can place the first support frame 2 equipped with the fan housing 1 above the second support frame 3, and ensure that the plurality of screws 9 can penetrate the first support frame 2, and then use a plurality of locking nuts 14 to screw on the plurality of screws 9. The plurality of 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 resilience, so as to ensure a better buffering effect on the equipment; after the installation is completed, the user can connect the external pipeline to the air outlet 5, and then start the drive motor 17. Through the transmission of the second pulley 19 and the first pulley 18, the wind wheel 15 can be driven to rotate, and then the wind can be transported.

[0055] When the device needs to be emergently stopped, the user can control the piston rod of the electric push rod 40 to push out. The electric push rod 40 can push the lifting plate 35 upward. After the positioning rod 36 at the bottom of the lifting plate 35 moves to a state of disengaging from 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 towards the outside of the electric control box 25. At this time, the two metal contacts 32 will also be separated, thereby completing the power-off stop of the drive motor 17, which is beneficial for quickly dealing with emergencies;

[0056] When the device needs to be maintained, the user can remove the shielding cover 7 to repair the drive motor 17; 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 disassembling the shielding cover 7, the user should perform the above operations 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 normally moved and unlocked. At the same time, since the drive motor 17 is powered off at this time, the user will also be safer during operation; when the user is performing the disassembly work of the shielding cover 7, only need to toggle the dial block 43 externally, and at this time the moving block 27 can move synchronously until the two clamping columns 28 disengage from the positioning frame 23, and then the shielding cover 7 can be slid upward and taken out;

[0057] When the user completes the repair, the user should perform the above operations in reverse. First, complete the installation of the shielding cover 7. Under the action of the second spring 29, the two clamping columns 28 penetrate through the positioning frame 23 through the preset holes, thereby completing the locking of the shielding cover 7; then the user can, on the premise of ensuring that the piston rod of the electric push rod 40 has been retracted, push the end of the moving frame 33 exposed outside the electric control box 25 until the second positioning hole 41 moves to align with the positioning rod 36. At this time, the lifting plate 35 can continuously move downward under the action of the fourth spring 37, and the positioning rod 36 will quickly pass through the second positioning hole 41 and insert into the first positioning hole 30 to complete the locking and positioning of the moving block 27, and at this time the two metal contacts 32 will also be in close contact again, thereby completing the connection of the drive motor 17 circuit to ensure its normal operation in the future.

[0058] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent replacements or changes, and 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 mounted 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 mounted with a first pulley (18); It also includes a driving motor (17), a fixing plate (6) being fixedly mounted on the bottom of the driving motor (17), the fixing plate (6) being fixedly mounted on one side of the fan housing (1), a second belt pulley (19) being fixedly connected to one end of the output shaft of the driving motor (17), the second belt pulley (19) and the first belt pulley (18) being 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); It also comprises a shielding cover (7), the shielding cover (7) being arranged on the top of the fixing plate (6), the driving motor (17) being located in the shielding cover (7), a clearance groove (22) being provided on one side of the shielding cover (7), the output shaft of the driving motor (17) passing through the clearance groove (22) and penetrating one side of the shielding cover (7), and the shielding cover (7) is used to provide shielding protection for the driving motor (17); Also included is a locking assembly, which is used to lock the installed shielding cover (7); Also included is an electric control component, the electric control component is used to quickly stop the drive motor (17); 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 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 mounted with a positioning frame (23), the positioning frame (23) cooperates with the locking box (24), and one end of each 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 slot (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 slot (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 slot (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); The electric control assembly comprises an electric control box (25) fixedly mounted on the top of the locking box (24); a fixed block (31) is fixedly mounted inside the electric control box (25); a movable frame (33) is slidably connected to the inner wall of the bottom of the electric control box (25); one end of the movable frame (33) slides through one side of the electric control box (25); the fixed block (31) and the movable frame (33) cooperate with each other, and a metal contact piece (32) is fixedly mounted on one side of the two movable frames (33); the two metal contacts (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 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 movable frame (33); when the two metal contacts (32) are in close contact with each other, the third spring (34) is in a compressed state; The electric control assembly further comprises a lifting plate (35) slidably arranged inside the electric control box (25), the lifting plate (35) being located above the moving frame (33), a positioning rod (36) being fixedly mounted on the bottom of the lifting plate (35), a second positioning hole (41) being opened on the top of the moving frame (33), the positioning rod (36) slidingly passing through the second positioning hole (41), a fourth spring (37) being fixedly mounted on the top of the lifting plate (35), the other end of the fourth spring (37) being 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).

2. The EC centrifugal fan of a 24V permanent magnet brushless DC motor according to claim 1, 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.

3. The EC centrifugal fan of a 24V permanent magnet brushless DC motor according to claim 1, characterized in that: A first positioning hole (30) is formed on 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).

4. 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 sleeved with the outer walls of the plurality of screw rods (9); the plurality of rubber pads (11), the abutment plate (12) and the first spring (13 ...) are sleeved with the outer walls of the plurality of ) 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 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.

5. 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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