High temperature centrifugal fan

Abstract

This application discloses a high-temperature centrifugal fan, relating to the field of centrifugal fans. It includes a motor, a shaft disk fixed to the motor's output shaft, and an impeller detachably connected to the end of the shaft disk away from the motor; a heat dissipation assembly including a heat dissipation wheel detachably connected to the shaft disk, a heat dissipation plate detachably connected to the motor, and a protective net detachably connected to the heat dissipation plate. The central axis of the heat dissipation plate is parallel to the axis of the motor's output shaft. The protective net is wrapped around the circumference of the heat dissipation wheel, and several air inlets are formed along the circumference of the heat dissipation plate. Several mesh holes on the protective net and the air inlets form a circulating heat dissipation channel; a heat insulation layer assembly including a heat insulation chamber and heat insulation cotton filled within the heat insulation chamber, the heat insulation chamber being detachably connected to the circumference of the shaft disk; and a volute assembly including a fan housing detachably connected to the heat insulation chamber, the fan housing located on the side of the heat insulation chamber away from the motor. This application achieves a portable and detachable overall fan design, helping to reduce maintenance costs.

Description

Technical Field

[0001] This application relates to the field of centrifugal fans, and more particularly to a high-temperature centrifugal fan. Background Technology

[0002] High-temperature fans are special fans widely used in industries such as chemical, petroleum, metallurgy, coating, boiler, environmental protection, and food drying. They generally operate at temperatures between 80 and 450 degrees Celsius.

[0003] Existing high-temperature fans have two transmission methods: belt drive and direct drive. In the case of belt drive, a water-cooled bearing housing is usually used as the transmission unit. The bearing housing has water channels inside, and circulating water is used to cool the dust extraction and ensure the normal operation of the transmission unit at high temperatures. However, the fan has a large external size, which limits the installation space.

[0004] Therefore, to address the installation space issue, existing high-temperature fans typically employ direct-drive technology. The motor and impeller are connected via a connector with internal water channels. Circulating water cools the connector and motor shaft, ensuring normal motor operation. Due to the water-cooling method, the connection between the connector, motor output shaft, and impeller is usually achieved through welding or other fixing methods to improve the connector's sealing. This structure cannot be disassembled, resulting in high maintenance costs and warrants improvement. Summary of the Invention

[0005] In order to make the overall structure of the fan easy to disassemble and assemble and reduce maintenance costs, this application provides a high-temperature centrifugal fan.

[0006] The high-temperature centrifugal fan provided in this application adopts the following technical solution:

[0007] A high-temperature centrifugal fan includes a motor, a shaft disk coaxially fixed on the output shaft of the motor, and an impeller detachably connected coaxially to the end of the shaft disk away from the motor;

[0008] The heat dissipation assembly includes a heat dissipation wheel detachably connected to the shaft disk, a heat dissipation plate detachably connected to the motor, and a protective net detachably connected to the heat dissipation plate. The central axis of the heat dissipation plate is parallel to the axis of the motor output shaft. The protective net is wrapped around the periphery of the heat dissipation wheel. The heat dissipation plate has several air inlets along its circumference, which face the periphery of the motor. Several mesh holes on the protective net and the air inlets form a circulating heat dissipation air channel.

[0009] The insulation layer assembly includes an insulation chamber and insulation cotton filled inside the insulation chamber, the insulation chamber being detachably connected to the periphery of the shaft disk;

[0010] The volute assembly includes a fan housing covering the periphery of the impeller, the fan housing being detachably connected to the insulation chamber, the fan housing being located on the side of the insulation chamber away from the motor.

[0011] By adopting the above technical solution, the motor rotates, driving the impeller to rotate, thereby drawing in and expelling external gas from the fan casing. Simultaneously, the cooling wheel rotates, drawing heat from the motor body's periphery into the protective mesh through the air inlet of the cooling plate, and then expelling it through the mesh openings of the protective mesh, thus achieving heat dissipation for the motor body. Furthermore, the cooling wheel, cooling plate, and protective mesh are all detachable, making assembly relatively simple and disassembly and maintenance convenient. Secondly, the use of the insulation chamber and the insulation cotton filled within it blocks the heat generated by the high-temperature gas inside the fan casing, helping to prevent heat transfer to the motor output shaft and affecting the motor's normal operation. Compared to water cooling, the detachable insulation chamber in this application facilitates disassembly, assembly, and maintenance, helping to reduce the overall maintenance cost of the machine.

[0012] Preferably, a connecting plate is detachably connected to the shaft disk, and the plane of the connecting plate is perpendicular to the axial direction of the motor output shaft. The heat dissipation assembly also includes a connecting block, which is located between the heat dissipation disk and the connecting plate. A connecting bolt is provided on the heat dissipation disk, and the connecting bolt passes through the heat dissipation disk, the connecting block and the connecting plate in sequence and is locked by a nut. An insertion slot is provided on the side of the connecting block away from the connecting plate, and the protective net is inserted into the insertion slot.

[0013] By adopting the above technical solution, in the actual assembly process, the heat sink is first connected to the motor, and then the protective net is inserted into the slot of the connecting block. The connecting bolts are then passed through the connecting block and the connecting plate in sequence and fixed with nuts. The nuts are pre-welded to the side of the connecting plate away from the connecting block to fix the protective net. Compared with the traditional welding process, this avoids the deformation risks caused by welding, helps to ensure that the installation of each component can maintain the same vertical plane, and thus helps to ensure the centering of the motor installation position.

[0014] Preferably, a positioning step is formed at the end of the shaft disk near the motor, the heat dissipation wheel abuts against the right angle of the positioning step, and the heat dissipation wheel is composed of two semi-circular wheels, which are wrapped around the periphery of the positioning step and fastened with bolts.

[0015] By adopting the above technical solution, in actual assembly, the two semi-circular wheels abut against the positioning step to achieve rapid positioning. Then, bolts are used to fasten the ends of the two semi-circular wheels so that they are held tightly on the shaft disk, thus achieving a detachable connection between the heat dissipation wheel and the shaft disk.

[0016] Preferably, a bushing is fitted on the shaft disc, one side of the bushing is detachably connected to the connecting plate, and the other side is detachably connected to the inner wall of the heat insulation chamber, and a packing seal is provided between the bushing and the shaft disc.

[0017] By adopting the above technical solution and utilizing the packing seal between the bushing and the shaft disc, it is helpful to prevent high-temperature gas from entering the shaft disc from the fan casing and then leaking out, thereby improving the sealing performance of the fan.

[0018] Preferably, the impeller is composed of a front blade plate, a rear blade plate, and a number of blades disposed between the front blade plate and the rear blade plate. The fan housing has openings on both sides. The opening on the side of the fan housing closer to the motor is larger than the diameter of the front blade plate and the rear blade plate. The opening on the side of the fan housing away from the motor is larger than the opening on the side closer to the motor. The fan housing is connected to the heat insulation chamber by bolts and nuts.

[0019] By adopting the above technical solution, in actual assembly, the impeller's rear blade is first connected to the shaft disk, and then the fan housing is fitted around the impeller and fixed with bolts and nuts. The opening on the side of the fan housing away from the motor is larger than the opening on the side closer to the motor, which facilitates the assembly and disassembly operations of the workers.

[0020] Preferably, the volute assembly includes a collector plate, which is detachably connected to the inlet of the fan housing by bolts.

[0021] By adopting the above technical solution and utilizing the collector plate, it is helpful to ensure that high-temperature gas enters the fan casing evenly, which helps to improve the efficiency of the fan. In addition, the collector plate is detachably connected to the inlet of the fan casing. When it is necessary to disassemble the fan casing, the collector plate can be removed first to disassemble the fan casing.

[0022] Preferably, the end of the shaft disk away from the motor output shaft has an extended portion, the bushing is sleeved on the extended portion, and a connecting ring plate is provided on the periphery of the bushing on the extended portion. The connecting ring plate is located at the end of the bushing away from the motor, and the blade rear plate is connected to the connecting ring plate by bolts and nuts.

[0023] By adopting the above technical solution and using the extended part of the bushing, the motor output shaft is moved away from the fan housing, which helps to reduce the heat transferred to the output shaft and thus helps the motor to operate normally. Compared with the existing method of custom-extending the motor output shaft, this method can be applied to ordinary motors and does not require customization of the motor. That is, the components of the fan in this application are easy to obtain, which helps to improve the universality of the fan.

[0024] Preferably, a connecting hole is formed on the side of the shaft disk near the motor, the motor output shaft is inserted and fixed to the connecting hole, a heat dissipation hole communicating with the connecting hole is formed in the extended part, and a heat dissipation fan is provided in the heat dissipation hole of the shaft disk to extract the heat generated at the motor output shaft.

[0025] By adopting the above technical solution, heat dissipation holes connected to the connection holes are opened in the shaft disk, which helps to prevent the heat from having nowhere to flow when the motor output shaft rotates. At the same time as the shaft disk rotates, the internal cooling fan rotates, which will draw the heat and transport it to the fan housing, and then transport it away with the high-temperature gas in the outside. This helps to improve the heat dissipation capacity of the motor output shaft, thereby helping to ensure the normal operation of the motor and improve the service life of the motor.

[0026] Preferably, the connecting plate has slots on both sides of the motor, and a lifting plate is inserted into the connecting plate through the slots, and the lifting plate is welded and fixed to the connecting plate.

[0027] By adopting the above technical solution, the lifting plate facilitates the movement and handling of the fan. In addition, the slots are used to make the lifting plate and the connecting plate fit together to achieve positioning before welding and fixing, which helps to improve the stability during welding.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. All components in this fan are detachable, facilitating disassembly and assembly and helping to reduce maintenance costs;

[0030] 2. By using an extended shaft disc, the motor output shaft is moved away from the fan housing, which slows down the heat conduction. One end of the heat dissipation hole is connected to the connection hole, and the other end is connected to the inside of the fan housing. With the rotation of the shaft disc, the heat generated at the motor output shaft is drawn into the fan housing to dissipate heat at the motor output shaft, which helps to ensure the normal operation of the motor and improves the heat dissipation capacity. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application;

[0032] Figure 2 This is a cross-sectional structural diagram of Embodiment 1 of this application;

[0033] Figure 3 This is a partial exploded view of Embodiment 1 of this application, mainly illustrating the structure of the heat dissipation component;

[0034] Figure 4 This is a partial structural diagram of Embodiment 1 of this application, mainly illustrating the structure of the heat dissipation wheel;

[0035] Figure 5 This is a partial structural cross-sectional view of Embodiment 1 of this application, mainly illustrating the structure of the shaft disk;

[0036] Figure 6 This is a partial structural cross-sectional view of Embodiment 2 of this application, mainly illustrating the structure of the cooling fan.

[0037] Reference numerals: 1. Motor; 2. Shaft disc; 21. Positioning step; 22. Connecting ring plate; 23. Connecting hole; 24. Extension section; 25. Heat dissipation hole; 3. Impeller; 31. Front blade disc; 32. Rear blade plate; 33. Blade; 4. Heat dissipation assembly; 41. Heat dissipation wheel; 411. Semi-circular wheel; 4111. Butt joint plate; 42. Heat dissipation plate; 421. Connecting bolt; 422. Air inlet; 43. Protective net; 44. Connecting block; 441. Insertion groove; 5. Insulation layer assembly; 51. Insulation chamber; 511. Clearance groove; 6. Volute assembly; 61. Fan housing; 62. Collector plate; 7. Shaft sleeve; 71. Receiving groove; 72. Packing seal; 8. Connecting plate; 81. Slot; 9. Lifting plate; 10. Washer; 20. Cooling fan. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0039] This application discloses a high-temperature centrifugal fan.

[0040] Example 1

[0041] Reference Figure 1 and Figure 2 The high-temperature centrifugal fan includes a motor 1, a shaft disk 2 coaxially fixed on the output shaft of the motor 1, and an impeller 3 detachably connected coaxially to the end of the shaft disk 2 away from the motor 1; a heat dissipation assembly 4 for heat dissipation of the motor 1 body; a heat insulation layer assembly 5 for heat insulation and reducing the heat conducted to the output shaft of the motor 1; and a volute assembly 6 covering the periphery of the impeller 3.

[0042] Reference Figure 2 and Figure 3 The heat dissipation component 4 includes a heat dissipation wheel 41, a heat dissipation plate 42, a protective net 43, and a connecting block 44. The heat dissipation wheel 41 is composed of two semi-circular wheels 411. The end of the shaft disk 2 near the motor 1 has a positioning step 21. In actual assembly, the two heat dissipation wheels 41 are first abutted against the right angle of the positioning step 21 of the shaft disk 2 to achieve rapid positioning.

[0043] Reference Figure 3 and Figure 4The semi-circular wheel 411 has heat dissipation fins integrally formed on it, and both ends of the semi-circular wheel 411 have mating plates 4111 integrally formed on them. When the two semi-circular wheels 411 cover the circumference of the shaft disk 2, the mating plates 4111 on the same side of the two semi-circular wheels 411 abut against each other and are then tightened by bolts and nuts to hold the two semi-circular wheels 411 tightly on the shaft disk 2, thereby realizing the detachable connection between the heat dissipation wheel 41 and the shaft disk 2.

[0044] Reference Figure 2 The heat sink 42 is detachably connected to the motor 1 mounting plate. The central axis of the heat sink 42 is parallel to the axis of the output of the motor 1. Multiple nuts are welded to the side of the heat sink 42 away from the motor 1 mounting plate. All nuts are circumferentially distributed. In actual installation, bolts are used to pass through the motor 1 mounting plate and the heat sink 42 in sequence and connect with the corresponding nuts to achieve a detachable connection between the heat sink 42 and the motor 1.

[0045] Reference Figure 2 and Figure 3 A bushing 7 is fitted on the shaft disk 2. A connecting plate 8 is connected to the side of the bushing 7 near the motor 1 by bolts. The plane of the connecting plate 8 is perpendicular to the axis of the output shaft of the motor 1. The connecting plate 8 is fitted on the shaft disk 2. A heat dissipation wheel 41 is located between the connecting plate 8 and the heat dissipation disk 42. The protective net 43 is circumferential. Four connecting blocks 44 are provided in this application. The connecting blocks 44 are distributed on the connecting plate 8 along the circumferential direction. The side of the connecting block 44 near the heat dissipation disk 42 has a plug-in groove 441. The protective net 43 is plugged into the four plug-in grooves 441 to facilitate the installation and removal of the protective net 43. Four connecting bolts 421 are provided on the heat dissipation disk 42 corresponding to the number of connecting blocks 44. Four nuts are welded on the side of the connecting plate 8 away from the heat dissipation disk 42. The position of the nuts corresponds to the position of the connecting blocks 44. The connecting bolts 421 are passed through the heat dissipation disk 42, the connecting blocks 44, and the connecting plate 8 in sequence and then connected to the corresponding nuts to fix the protective net 43 and the connecting blocks 44.

[0046] The connecting plate 8 is also provided with a slot 81 on the side near the motor 1. The slots 81 are distributed on both sides of the motor 1. The connecting plate 8 is connected to the lifting plate 9 through the slots 81. The lifting plate 9 is first positioned by the slots 81 and then welded to achieve a fixed connection between the lifting plate 9 and the connecting plate 8.

[0047] The heat sink 42 has several air inlets 422 along its circumference. The air inlets 422 are waist-shaped grooves and all of them face the periphery of the motor body. The mesh holes on the protective net 43 and the air inlets 422 form a circulating heat dissipation channel, which absorbs the heat generated by the motor body in time and helps to improve the heat dissipation effect of the motor body.

[0048] Reference Figure 2The heat insulation layer assembly 5 includes a heat insulation chamber 51 with an opening on one side and heat insulation cotton filled in the heat insulation chamber 51. The heat insulation cotton is made of aluminum silicate cotton. The opening of the heat insulation chamber 51 faces the motor 1 side, and the opening of the heat insulation chamber 51 is fixed to the connecting plate 8 by bolts. An avoidance groove 511 is provided on the side of the heat insulation chamber 51 away from the motor 1 for the shaft disc 2 to pass through. The bottom wall of the heat insulation chamber 51 away from the motor 1 is fixed to the bushing 7 by bolts. The bushing 7 is located between the heat insulation chamber 51 and the connecting plate 8. Two receiving grooves 71 are provided on the inner wall of the bushing 7. Each of the two receiving grooves 71 is provided with a packing seal 72, which is made of carbon fiber packing.

[0049] The end of the shaft disk 2 away from the motor 1 is provided with a protruding heat insulation chamber 51, and a connecting ring plate 22 is integrally formed at this end of the shaft disk 2. The impeller 3 is composed of a front blade disk 31, a rear blade plate 32, and several blades 33 integrally formed between the front blade disk 31 and the rear blade plate 32. The rear blade plate 32 is open in the middle. The rear blade plate 32 is sleeved on the shaft disk 2 and abuts against the side of the connecting ring plate 22 near the motor 1. The two are fixedly connected by bolts and nuts, realizing the detachable connection between the impeller 3 and the shaft disk 2.

[0050] See example 2 and Figure 5 A connecting hole 23 is provided on the side of the shaft disk 2 near the motor 1. The output shaft of the motor 1 and the connecting hole 23 are coaxially fixed by a keyway connection. An extended part 24 is formed at the end of the shaft disk 2 away from the motor 1. The bushing 7 is fitted on the extended part 24. The connecting ring plate 22 is integrally formed at the end of the extended part 24 away from the motor 1. A heat dissipation hole 25 is provided in the extended part 24. The heat dissipation hole 25 communicates with the connecting hole 23 and communicates with the inside of the fan housing 61. Traditional fans use a custom-designed, extended motor output shaft that is coaxially fixed with the impeller 3. Heat inside the fan housing 61 is directly conducted to the motor output shaft, affecting the motor's performance. Furthermore, custom-designed motors have long delivery cycles and are expensive. This application achieves direct connection between the motor 1 and the impeller 3 through the shaft disc 2, while also increasing the distance between the output shaft and the fan housing 61, thus mitigating heat conduction. Moreover, the motor 1 in this application does not require customization, meaning the fan in this application has greater applicability. The heat dissipation holes 25 are connected to the fan housing 61, facilitating the dissipation of heat generated by the motor 1 output shaft during rotation, thereby helping to ensure the normal operation of the motor 1.

[0051] Reference Figure 2The volute assembly 6 includes a fan housing 61 and a collector plate 62. The fan housing 61 covers the periphery of the impeller 3 and is volute-shaped. The fan housing 61 has openings on both sides, and the opening on the side of the fan housing 61 closer to the motor 1 is larger than the diameter of the front plate 31 and the rear plate 32. The opening on the side of the fan housing 61 away from the motor 1 is larger than the opening on the side closer to the motor 1. The side plate of the fan housing 61 closer to the motor 1 is connected to the bottom plate of the heat insulation chamber 51 away from the motor 1 by bolts and nuts, realizing the detachable connection of the fan housing 61. Washers 10 are connected to the periphery of the opening on the side of the fan housing 61 away from the motor 1 by bolts and nuts. The collector plate 62 is connected to the washers 10 by bolts and nuts, realizing the detachable connection of the collector plate 62.

[0052] The implementation principle of a high-temperature centrifugal fan according to an embodiment of this application is as follows: all components of the fan are detachably connected, which facilitates disassembly, assembly, and maintenance; a circulating heat dissipation air duct is formed by the protective net 43 and the heat dissipation plate 42, which helps to cool the motor 1 body. In addition, the protective net 43 and the heat dissipation plate 42 are detachably connected, which facilitates assembly. Compared with the traditional welding method, it helps to prevent the motor 1 from being misaligned due to welding deformation, thus affecting subsequent assembly operations; the output shaft of the motor 1 is connected to the impeller 3 through the shaft disk 2. The shaft disk 2 increases the distance between the output shaft of the motor 1 and the fan housing 61, which helps to reduce the conduction of heat from the fan housing 61 to the output shaft of the motor 1, that is, it helps to reduce the heat on the output shaft of the motor 1, thereby ensuring the normal operation of the motor 1.

[0053] Example 2

[0054] Reference Figure 6 The difference between this embodiment and embodiment 1 is that two cooling fans 20 are welded and fixed inside the heat dissipation hole 25 on the shaft disk 2. The two cooling fans 20 are distributed along the length of the shaft disk 2 to extract the heat generated when the output shaft of the motor 1 rotates, and transport it into the fan housing 61, and discharge it as the impeller 3 rotates. This helps to improve the heat dissipation effect on the output shaft of the motor 1, and thus helps to ensure the normal operation of the motor 1.

[0055] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-temperature centrifugal fan, characterized in that: Includes a motor (1), on which a shaft disk (2) is coaxially fixed, and an impeller (3) is detachably connected to the end of the shaft disk (2) away from the motor (1); The heat dissipation assembly (4) includes a heat dissipation wheel (41) detachably connected to the shaft disk (2), a heat dissipation plate (42) detachably connected to the motor (1), and a protective net (43) detachably connected to the heat dissipation plate (42). The central axis of the heat dissipation plate (42) is parallel to the axis of the output shaft of the motor (1). The protective net (43) is wrapped around the periphery of the heat dissipation wheel (41). The heat dissipation plate (42) has several air inlets (422) along the circumference. The air inlets (422) face the periphery of the motor (1). The several mesh holes on the protective net (43) and the air inlets (422) form a circulating heat dissipation air channel. The insulation layer assembly (5) includes an insulation chamber (51) and insulation cotton filled in the insulation chamber (51), the insulation chamber (51) being detachably connected to the periphery of the shaft disk (2); The volute assembly (6) includes a fan housing (61) covering the periphery of the impeller (3), the fan housing (61) being detachably connected to the heat insulation chamber (51), the fan housing (61) being located on the side of the heat insulation chamber (51) away from the motor (1); A connecting plate (8) is detachably connected to the shaft disk (2). The plane of the connecting plate (8) is perpendicular to the axis of the output shaft of the motor (1). The heat dissipation assembly (4) also includes a connecting block (44). The connecting block (44) is located between the heat dissipation disk (42) and the connecting plate (8). A connecting bolt (421) is provided on the heat dissipation disk (42). The connecting bolt (421) passes through the heat dissipation disk (42), the connecting block (44) and the connecting plate (8) in sequence and is locked by a nut. A plug-in groove (441) is provided on the side of the connecting block (44) away from the connecting plate (8). The protective net (43) is plugged into the plug-in groove (441). A bushing (7) is fitted on the shaft disc (2). One side of the bushing (7) is detachably connected to the connecting plate (8), and the other side is detachably connected to the inner wall of the heat insulation chamber (51). A packing seal (72) is provided between the bushing (7) and the shaft disc (2). The impeller (3) is composed of a front blade disc (31), a rear blade plate (32), and a number of blades (33) disposed between the front blade disc (31) and the rear blade plate (32). The fan housing (61) has openings on both sides. The diameter of the opening on the side of the fan housing (61) closer to the motor (1) is larger than the diameter of the front blade disc (31) and the rear blade plate (32). The diameter of the opening on the side of the fan housing (61) away from the motor (1) is larger than the diameter of the opening on the side closer to the motor (1). The fan housing (61) is connected to the heat insulation chamber (51) by bolts and nuts. The volute assembly (6) includes a collector plate (62), which is detachably connected to the inlet of the fan housing (61) by bolts; The shaft disc (2) has an extended portion (24) at the end away from the output shaft of the motor (1). The bushing (7) is fitted on the extended portion (24). A connecting ring plate (22) is provided on the periphery of the bushing (7) and the connecting ring plate (22) is located at the end of the bushing (7) away from the motor (1). The blade rear plate (32) is connected to the connecting ring plate (22) by bolts and nuts. A connecting hole (23) is formed on the side of the shaft disk (2) near the motor (1). The output shaft of the motor (1) is inserted and fixed in the connecting hole (23). A heat dissipation hole (25) communicating with the connecting hole (23) is formed in the extended part (24).

2. A high-temperature centrifugal fan according to claim 1, characterized in that: The shaft disc (2) has a positioning step (21) at one end near the motor (1). The heat dissipation wheel (41) abuts against the right angle of the positioning step (21). The heat dissipation wheel (41) is composed of two semi-circular wheels (411). The two semi-circular wheels (411) are wrapped around the positioning step (21) and fastened with bolts.

3. A high-temperature centrifugal fan according to claim 1, characterized in that: The shaft disk (2) is equipped with a cooling fan (20) inside the heat dissipation hole (25) to extract the heat generated at the output shaft of the motor (1).

4. A high-temperature centrifugal fan according to claim 1, characterized in that: The connecting plate (8) has slots (81) on both sides of the motor (1). A lifting plate (9) is inserted into the connecting plate (8) through the slots (81), and the lifting plate (9) is welded and fixed to the connecting plate (8).

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