Energy-saving environment-friendly high-speed direct-drive centrifugal fan

Abstract

The invention discloses an energy-saving environment-friendly high-speed direct-driven centrifugal fan which comprises a pressing sleeve, an air inlet channel and a dust filtering net cylinder. According to the energy-saving and environment-friendly high-speed direct-driven centrifugal fan, a pressing sleeve is fixedly mounted at an air inlet of a shell through a first bolt, an air inlet channel is formed in the center of the pressing sleeve, a mounting ring is fixedly connected to the inner opening end of the air inlet channel, a connecting ring is fixedly mounted on the mounting ring through a second bolt, and a dust filtering net cylinder is fixedly connected to the inner edge of the connecting ring; the dust filtering mesh cylinder is arranged in the air inlet channel, the pressing sleeve is installed at the air inlet of the shell, the dust filtering mesh cylinder is installed in the air inlet channel in the pressing sleeve, meanwhile, the first air holes are formed in the side wall of the air inlet channel, and compared with a flat plate type filter screen, the dust filtering mesh cylinder effectively increases the air inlet area; and comprehensive ventilation and air intake are carried out through the first air holes, so that under the condition of the same air intake amount, the influence of wind resistance on the air intake amount is effectively reduced in a mode of sharing the air intake amount of a rated area.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal fans, and specifically to an energy-saving, environment-friendly and high-speed direct-drive centrifugal fan. Background Art

[0002] A centrifugal fan is a machine that relies on the input mechanical energy to increase the gas pressure and discharge the gas. It is a driven fluid machine. Centrifugal fans are widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and induced draft of boilers and industrial furnaces; cooling and ventilation in air conditioning equipment and household electrical appliances; drying and selection of grains; air source of wind tunnels and inflation and propulsion of hovercrafts, etc.

[0003] A centrifugal fan is based on the principle of converting kinetic energy into potential energy. It uses a high-speed rotating impeller to accelerate the gas, and then decelerates and changes the flow direction to convert the kinetic energy into potential energy (pressure). In a single-stage centrifugal fan, the gas enters the impeller axially. When the gas flows through the impeller, it changes to the radial direction and then enters the diffuser. In the diffuser, the gas changes the flow direction and the cross-sectional area of the pipeline increases to decelerate the air flow. This deceleration effect converts the kinetic energy into pressure energy. The pressure increase mainly occurs in the impeller and secondly in the diffusion process. In a multi-stage centrifugal fan, a return air device is used to make the air flow enter the next impeller to generate a higher pressure.

[0004] Some centrifugal fans are provided with a filter screen at the air inlet. However, directly setting the filter screen will cause the air inlet to be blocked, affect the air inlet efficiency and increase the energy consumption. Therefore, an energy-saving, environment-friendly and high-speed direct-drive centrifugal fan is proposed to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide an energy-saving, environment-friendly and high-speed direct-drive centrifugal fan to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: An energy-saving, environment-friendly and high-speed direct-drive centrifugal fan includes a housing. A drive shaft is rotatably and penetratingly connected through the center of the housing. An impeller is connected to the drive shaft. A gland is fixedly installed at the air inlet of the housing through a first bolt. An air inlet passage is provided at the center of the gland. An installation ring is fixedly connected to the inner end of the air inlet passage. A connection ring is fixedly installed on the installation ring through a second bolt. The second bolt passes through the connection ring and the installation ring and is threadedly connected with a nut. Round holes for the second bolt to pass through are provided on both the connection ring and the installation ring. The inner extension of the connection ring is fixedly connected with a dust filter cylinder. The dust filter cylinder is arranged in the air inlet passage. First air holes are evenly provided on the side wall of the air inlet passage corresponding to the dust filter cylinder. One end of the drive shaft passes through the housing and is connected to the output end of the motor through a coupling. The motor is externally connected with a power supply and a switch.

[0007] As a further solution of the present invention: the blades of the impeller are spirally arranged, the outer extension of the shell is provided with an outward-expanding air duct, the end of the outward-expanding air duct is provided with an air outlet, the end of the air outlet is fixedly connected with a connecting flange, the impeller is provided with a circular hole for the drive shaft to pass through, the end of the drive shaft is provided with an external thread, the end of the drive shaft is threaded with a locking nut, the locking nut is pressed on the end face of the impeller, a convex key is embedded through the part of the drive shaft close to the inner wall of the shell, the impeller is provided with a keyway corresponding to and adapted to the convex key, the convex key is inserted into the keyway and slidably connected.

[0008] As a further solution of the present invention: the air inlet of the shell and the extension of the pressure sleeve are both provided with a first mounting flange, the first bolt passes through the two first mounting flanges at the same time and is threadedly connected with a nut, and the first mounting flange is provided with a circular hole for the first bolt to pass through.

[0009] As a further solution of the present invention: the end of the air inlet channel is fixedly installed with a front outer cover by a third bolt, a connecting blind plate portion is provided in the center of the front outer cover, and a second mounting flange is provided at the end of the air inlet channel. The third bolt penetrates the connecting blind plate portion and the second mounting flange at the same time and is threadedly connected with a nut, which is welded and fixedly installed on the back side of the second mounting flange, and circular holes for the third bolt to penetrate are provided on the connecting blind plate portion and the second mounting flange.

[0010] As a further solution of the present invention: the outer side of the front outer cover is provided with a rear outer cover corresponding to it, the rear outer cover and the front outer cover are jointly covered on the outer side of the shell, the rear outer cover and the front outer cover are fixedly installed by a fourth bolt, the outer extensions of the rear outer cover and the front outer cover are both provided with a fourth mounting flange, the fourth bolt penetrates through the fourth mounting flange and is threadedly connected with a nut, the rear outer cover and the front outer cover are jointly provided with an avoidance groove for avoiding the air outlet, the fourth mounting flange is synchronously avoided at the avoidance groove, the fourth bolt is staggered and installed at the avoidance groove, and a circular hole for the fourth bolt to penetrate is opened on the circumference of the fourth mounting flange.

[0011] As a further solution of the present invention: the inner extension of the rear outer cover is fixedly connected with a motor mounting cover, the motor is assembled and installed in the motor mounting cover, and a second air vent is provided on the inner side of the motor mounting cover corresponding to the rear outer cover.

[0012] As a further solution of the present invention: the motor mounting cover is fixedly installed with the shell by a fifth bolt, the end of the motor mounting cover corresponding to the shell is fixedly connected with a fifth mounting flange, the back of the shell is fixedly connected with a mounting end plate, the fifth bolt passes through the fifth mounting flange and is threadedly connected to the mounting end plate, the fifth mounting flange is provided with a circular hole for the fifth bolt to pass through, and the mounting end plate is provided with a threaded hole for the fifth bolt to be inserted and threadedly connected.

[0013] As a further solution of the present invention: A fixed base is fixedly connected to the bottoms of the motor mounting cover and the rear outer cover, and fixing holes are provided on the fixed base.

[0014] As a further solution of the present invention: A T-shaped guide groove is fixedly connected to the inner circumference of the motor mounting cover, and a T-shaped connecting plate is fixedly connected to the outer circumference of the motor housing. The T-shaped connecting plate is inserted into the T-shaped guide groove and is slidably connected to the T-shaped guide groove. A sixth bolt is threadedly connected to the motor mounting cover corresponding to each T-shaped guide groove. The sixth bolt penetrates through the T-shaped guide groove and is inserted into the T-shaped connecting plate. Threaded holes for the threaded connection of the sixth bolt are jointly opened on the T-shaped guide groove and the motor mounting cover, and fixing blind holes for the insertion and pressing of the sixth bolt are opened on the T-shaped connecting plate.

[0015] As a further solution of the present invention: A protective net is provided outside the air inlet end of the motor mounting cover. The outer extension of the protective net is bent inward and is fixedly installed with the motor mounting cover through a seventh bolt. The seventh bolt penetrates through the bent edge of the protective net and the motor mounting cover and is then threadedly connected with a nut. Circular holes for the penetration of the seventh bolt are provided on the motor mounting cover.

[0016] Compared with the prior art, the beneficial effects of the present invention are: In the present invention, a pressing sleeve is installed at the air inlet of the housing, and a dust filtering net cylinder is installed in the air inlet channel inside the pressing sleeve. At the same time, first air permeable holes are opened on the side wall of the air inlet channel. Compared with a flat filter screen, the dust filtering net cylinder effectively increases the air intake area and conducts comprehensive ventilation and air intake through the first air permeable holes. Therefore, under the condition of the same air intake volume, the influence of wind resistance on the air intake volume is effectively reduced by sharing the air intake volume of the rated area.

[0017] In the present invention, a front outer cover is installed at the end of the air inlet channel, and a rear outer cover is connected to the front outer cover. Thus, an air intake channel is formed through the motor mounting cover, the second air permeable hole, the front outer cover, and the rear outer cover, and air intake is carried out from the motor direction, thereby playing a role in motor heat dissipation and effectively achieving an energy-saving effect.

[0018] The whole fan of the present invention is assembled and installed through bolts and can be disassembled into a housing, an impeller, a motor, a pressing sleeve, a dust filtering net cylinder, a front outer cover, a rear outer cover, and a protective net. When a component is damaged, it can be conveniently replaced and maintained. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of an energy-saving and environment-friendly high-speed direct-drive centrifugal fan.

[0020] Figure 2 It is a rear three-dimensional view of an energy-saving and environment-friendly high-speed direct-drive centrifugal fan.

[0021] Figure 3 It is a sectional view of an energy-saving and environment-friendly high-speed direct-drive centrifugal fan.

[0022] Figure 4 It is an internal view of the housing in an energy-saving, environment-friendly and high-speed direct-drive centrifugal fan.

[0023] Figure 5 It is a display diagram of the impeller in an energy-saving, environment-friendly and high-speed direct-drive centrifugal fan.

[0024] Figure 6 It is a display diagram of the bush in an energy-saving, environment-friendly and high-speed direct-drive centrifugal fan.

[0025] Figure 7 It is a display diagram of the rear outer cover in an energy-saving, environment-friendly and high-speed direct-drive centrifugal fan.

[0026] In the figure: 1. housing; 2. drive shaft; 3. impeller; 4. first bolt; 5. bush; 6. air inlet channel; 7. mounting ring; 8. second bolt; 9. connecting ring; 10. dust filter cartridge; 11. first ventilation hole; 12. outward-expanding air duct; 13. air outlet; 14. connecting flange; 15. convex key; 16. keyway; 17. first mounting flange; 18. third bolt; 19. front outer cover; 20. connecting blind plate part; 21. second mounting flange; 22. rear outer cover; 23. coupling; 24. motor; 25. fourth bolt; 26. fourth mounting flange; 27. avoidance groove; 28. motor mounting cover; 29. second ventilation hole; 30. fifth bolt; 31. fifth mounting flange; 32. mounting end plate; 33. fixed base; 34. fixing hole; 35. T-shaped guide groove; 36. T-shaped connecting plate; 37. sixth bolt; 38. protective cover net; 39. seventh bolt; 40. lock nut. Specific embodiments

[0027] 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Please refer to Figures 1 to 7, in the embodiment of the present invention, an energy-saving and environment-friendly high-speed direct-drive centrifugal fan includes a housing 1. A drive shaft 2 is rotatably and penetratingly connected through the center of the housing 1. An impeller 3 is connected to the drive shaft 2. A gland 5 is fixedly installed at the air inlet of the housing 1 through a first bolt 4. An air inlet passage 6 is provided at the center of the gland 5. An installation ring 7 is fixedly connected to the inner end of the air inlet passage 6. A connecting ring 9 is fixedly installed on the installation ring 7 through a second bolt 8. The second bolt 8 passes through the connecting ring 9 and the installation ring 7 and is threadedly connected with a nut. Round holes for the second bolt 8 to pass through are provided on both the connecting ring 9 and the installation ring 7. The inner extension of the connecting ring 9 is fixedly connected with a dust-filtering mesh cylinder 10. The dust-filtering mesh cylinder 10 is arranged in the air inlet passage 6. First air-permeable holes 11 are evenly provided on the side wall of the air inlet passage 6 corresponding to the dust-filtering mesh cylinder 10. One end of the drive shaft 2 passes out of the housing 1 and is connected to the output end of a motor 24 through a coupling 23. The motor 24 is externally connected with a power supply and a switch.

[0029] The gland 5 is installed at the air inlet of the housing 1, and the dust-filtering mesh cylinder 10 is installed in the air inlet passage 6 inside the gland 5. At the same time, first air-permeable holes 11 are provided on the side wall of the air inlet passage 6. Compared with a flat filter screen, the dust-filtering mesh cylinder 10 effectively increases the air intake area, and conducts comprehensive ventilation and air intake through the first air-permeable holes 11. Thus, under the condition of the same air intake volume, by sharing the air intake volume of the rated area, the influence of wind resistance on the air intake volume is effectively reduced.

[0030] The blades of the impeller 3 are helically arranged. An outward-expanding air duct 12 is provided on the outer extension of the housing 1. An air outlet 13 is provided at the end of the outward-expanding air duct 12. A connecting flange 14 is fixedly connected to the end of the air outlet 13. A round hole for the drive shaft 2 to pass through is provided on the impeller 3. External threads are provided at the end of the drive shaft 2. A locking nut 40 is threadedly connected to the external threads at the end of the drive shaft 2. The locking nut 40 presses on the end face of the impeller 3. A convex key 15 is embedded and penetrated in a part of the drive shaft 2 close to the inner wall of the housing 1. A key groove 16 corresponding to and adapted to the convex key 15 is provided on the impeller 3. The convex key 15 is inserted into the key groove 16 and is slidably connected.

[0031] The gland 5 is installed at the air inlet of the housing 1, so as to form an air inlet wall inside the housing 1, and the wind force is output to the air outlet 13 through the outward-expanding air duct 12, thereby effectively increasing the output wind speed.

[0032] First installation flanges 17 are provided on both the air inlet of the housing 1 and the outer extension of the gland 5. The first bolt 4 passes through both first installation flanges 17 at the same time and is threadedly connected with a nut. Round holes for the first bolt 4 to pass through are provided on the first installation flanges 17.

[0033] The end of the air inlet channel 6 is fixedly installed with a front outer cover 19 by a third bolt 18. A connecting blind plate portion 20 is provided in the center of the front outer cover 19. A second mounting flange 21 is provided at the end of the air inlet channel 6. The third bolt 18 penetrates both the connecting blind plate portion 20 and the second mounting flange 21 and is threadedly connected with a nut. The nut is welded and fixedly installed on the back side of the second mounting flange 21. Circular holes for the third bolt 18 to penetrate are provided on the connecting blind plate portion 20 and the second mounting flange 21.

[0034] A corresponding rear cover 22 is provided on the outer side of the front cover 19, and the rear cover 22 and the front cover 19 are jointly covered on the outer side of the housing 1, and the rear cover 22 and the front cover 19 are fixedly installed by a fourth bolt 25, and a fourth mounting flange 26 is provided on the extension of the rear cover 22 and the front cover 19, and a nut is threadedly connected after the fourth bolt 25 penetrates the fourth mounting flange 26, and the rear cover 22 and the front cover 19 are jointly provided with an avoidance groove 27 for avoiding the air outlet 13, and the fourth mounting flange 26 is synchronously avoided at the avoidance groove 27, and the fourth bolt 25 is installed staggered at the avoidance groove 27, and a circular hole for the fourth bolt 25 to penetrate is opened on the circumference of the fourth mounting flange 26.

[0035] The inner extension of the rear outer cover 22 is fixedly connected with a motor mounting cover 28 , and the motor 24 is assembled and mounted in the motor mounting cover 28 . A second air vent 29 is provided on the inner side of the motor mounting cover 28 corresponding to the rear outer cover 22 .

[0036] The motor mounting cover 28 is fixedly mounted to the housing 1 by means of a fifth bolt 30. The end of the motor mounting cover 28 corresponding to the housing 1 is fixedly connected with a fifth mounting flange 31. The back of the housing 1 is fixedly connected with a mounting end plate 32. The fifth bolt 30 passes through the fifth mounting flange 31 and is threadedly connected to the mounting end plate 32. A circular hole for the fifth bolt 30 to pass through is provided on the fifth mounting flange 31, and a threaded hole for the fifth bolt 30 to be inserted and threadedly connected is provided on the mounting end plate 32.

[0037] The motor mounting cover 28 and the bottom of the rear outer cover 22 are fixedly connected to a fixing base 33 , and a fixing hole 34 is provided on the fixing base 33 .

[0038] A T-shaped guide groove 35 is fixedly connected to the inner circumference of the motor mounting cover 28, and a T-shaped connecting plate 36 is fixedly connected to the outer circumference of the shell wall of the motor 24. The T-shaped connecting plate 36 is inserted into the T-shaped guide groove 35 and is slidably connected to the T-shaped guide groove 35. A sixth bolt 37 is threadedly connected to each T-shaped guide groove 35 on the motor mounting cover 28. The sixth bolt 37 penetrates the T-shaped guide groove 35 and is inserted into the T-shaped connecting plate 36. The T-shaped guide groove 35 and the motor mounting cover 28 are jointly provided with a threaded hole for the threaded connection of the sixth bolt 37, and the T-shaped connecting plate 36 is provided with a fixed blind hole for the sixth bolt 37 to be inserted and tightened.

[0039] A protective cover net 38 is provided outside the air inlet end of the motor mounting cover 28. The outer extension of the protective cover net 38 is bent inward and fixedly installed with the motor mounting cover 28 through the seventh bolt 39. The seventh bolt 39 passes through the bent edge of the protective cover net 38 and the motor mounting cover 28 and is threadedly connected with a nut. The motor mounting cover 28 is provided with a round hole for the seventh bolt 39 to pass through.

[0040] The front outer cover 19 is installed at the end of the air inlet passage 6, and the rear outer cover 22 is connected to the front outer cover 19, so as to form an air inlet passage through the motor mounting cover 28, the second ventilation hole 29, the front outer cover 19, and the rear outer cover 22, and air is introduced from the motor direction, thereby playing the function of motor heat dissipation and effectively achieving the energy-saving effect.

[0041] The whole fan is assembled and installed by bolts and can be disassembled into the housing 1, the impeller 3, the motor 24, the bush 5, the dust filter net cylinder 10, the front outer cover 19, the rear outer cover 22, and the protective cover net 38, so that when a component is damaged, it can be conveniently replaced and maintained.

[0042] The working principle of the present invention is: During use, the dust filter net cylinder 10 is installed on the bush 5 through the mounting ring 7, the connecting ring 9, and the second bolt 8. Further, the impeller 3 is correspondingly installed on the drive shaft 2, so that the convex key 15 is inserted into the key groove 16, and the locking nut 40 is screwed on for fixation. At this time, the bush 5 is placed corresponding to the air inlet of the housing 1 and fixedly installed through the third bolt 18 and the first mounting flange 17. Further, the front outer cover 19 is fixedly installed on the end face of the air inlet passage 6 through the connecting twist plate portion 20, the second mounting flange 21, and the third bolt 18. At this time, the motor 24 is connected to the drive shaft 2 through the coupling 23. Further, the rear outer cover 22 is installed. At this time, the T-shaped connecting plate 36 on the motor 24 corresponds to the T-shaped guide groove 35 in the motor mounting cover 28, so that the motor mounting cover 28 covers the outside of the motor 24, and the T-shaped connecting plate 36 is inserted into the T-shaped guide groove 35. At this time, the rear outer cover 22 fits with the front outer cover 19, and further, the rear outer cover 22 and the front outer cover 19 are locked and fixed through the fourth bolt 25 and the fourth mounting flange 26. Further, the motor mounting cover 28 is installed on the mounting end plate 32 through the fifth bolt 30 and the fifth mounting flange 31 to form the installation and fixation. At this time, the T-shaped connecting plate 36 is locked through the sixth bolt 37, and further, the protective cover net 38 is fixedly installed through the seventh bolt 39 to complete the assembly of the fan.

[0043] An air inlet passage is formed through the motor mounting cover 28, the second ventilation hole 29, the front outer cover 19, and the rear outer cover 22. The motor 24 drives the drive shaft 2 to rotate, thereby driving the impeller 3 to rotate, and then air is drawn in and blown. The air entering through the air inlet passage passes through the first ventilation hole 11 to the outside of the dust filter net cylinder 10, is sucked into the housing 1 through the filtration of the dust filter net cylinder 10, and is output through the outward expanding air duct 12 and the air outlet 13.

[0044] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An energy-saving and environment-friendly high-speed direct-drive centrifugal fan, comprising a housing (1), characterized in that: A drive shaft (2) is rotatably connected through the center of the housing (1). An impeller (3) is connected to the drive shaft (2). A compression sleeve (5) is fixedly installed at the air inlet of the housing (1) through a first bolt (4). An air inlet passage (6) is provided at the center of the compression sleeve (5). An installation ring (7) is fixedly connected to the inner end of the air inlet passage (6). A connection ring (9) is fixedly installed on the installation ring (7) through a second bolt (8). The second bolt (8) passes through the connection ring (9) and the installation ring (7) and is threadedly connected with a nut. A dust filter cartridge (10) is fixedly connected to the inner extension of the connection ring (9). The dust filter cartridge (10) is arranged in the air inlet passage (6). First air-permeable holes (11) are evenly formed in the side wall of the air inlet passage (6) corresponding to the dust filter cartridge (10). One end of the drive shaft (2) passes through the housing (1) and is connected to the output end of the motor (24) through a coupling (23).

2. The energy-saving and environmental-friendly high-speed direct-drive centrifugal fan according to claim 1, wherein: The blades of the impeller (3) are arranged in a spiral shape. An outward-expanding air duct (12) is provided on the outer extension of the housing (1). An air outlet (13) is provided at the end of the outward-expanding air duct (12). A connection flange (14) is fixedly connected to the end of the air outlet (13). A round hole for the drive shaft (2) to pass through is provided on the impeller (3). External threads are provided at the end of the drive shaft (2). A locking nut (40) is threadedly connected to the external threads at the end of the drive shaft (2). A convex key (15) is embedded through the part of the drive shaft (2) close to the inner wall of the housing (1). A key groove (16) corresponding to and adapted to the convex key (15) is formed on the impeller (3).

3. The energy-saving and environmental-friendly high-speed direct-drive centrifugal fan according to claim 1, wherein: First installation flanges (17) are provided on the outer extensions of both the air inlet of the housing (1) and the compression sleeve (5). The first bolt (4) passes through both first installation flanges (17) and is threadedly connected with a nut.

4. An energy-saving and environment-friendly high-speed direct-drive centrifugal fan according to claim 1, characterized in that: A front outer cover (19) is fixedly installed at the end of the air inlet passage (6) through a third bolt (18). A connection blind plate part (20) is provided at the center of the front outer cover (19). A second installation flange (21) is provided at the end of the air inlet passage (6). The third bolt (18) passes through both the connection blind plate part (20) and the second installation flange (21) and is threadedly connected with a nut. The nut is fixedly installed by welding on the back of the second installation flange (21).

5. The energy-saving and environmental-friendly high-speed direct-drive centrifugal fan according to claim 4, characterized in that: A rear outer cover (22) corresponding to the front outer cover (19) is provided on the outside of the front outer cover (19). The rear outer cover (22) and the front outer cover (19) jointly cover the outside of the housing (1). The rear outer cover (22) and the front outer cover (19) are fixedly installed through a fourth bolt (25). Fourth installation flanges (26) are provided on the outer extensions of both the rear outer cover (22) and the front outer cover (19). The fourth bolt (25) passes through the fourth installation flange (26) and is threadedly connected with a nut. The rear outer cover (22) and the front outer cover (19) jointly have an avoidance groove (27) for avoiding the air outlet (13).

6. The energy-saving and environment-friendly high-speed direct-drive centrifugal fan according to claim 5, wherein: A motor installation cover (28) is fixedly connected to the inner extension of the rear outer cover (22). The motor (24) is assembled and installed in the motor installation cover (28). Second air-permeable holes (29) are provided on the inner side of the motor installation cover (28) corresponding to the rear outer cover (22).

7. The energy-saving and environment-friendly high-speed direct-drive centrifugal fan according to claim 6, characterized in that: The motor mounting cover (28) is fixedly installed on the housing (1) by the fifth bolt (30). A fifth mounting flange (31) is fixedly connected to one end of the motor mounting cover (28) corresponding to the housing (1). An installation end plate (32) is fixedly connected to the back of the housing (1). The fifth bolt (30) passes through the fifth mounting flange (31) and is threadedly connected to the installation end plate (32).

8. The energy-saving and environment-friendly high-speed direct-drive centrifugal fan according to claim 6, characterized in that: A fixed base (33) is fixedly connected to the bottoms of the motor mounting cover (28) and the rear outer cover (22). A fixing hole (34) is provided on the fixed base (33).

9. The energy-saving and environment-friendly high-speed direct-drive centrifugal fan according to claim 6, wherein: A T-shaped guide groove (35) is fixedly connected to the inner circumference of the motor mounting cover (28). A T-shaped connecting plate (36) is fixedly connected to the outer circumference of the housing wall of the motor (24). The T-shaped connecting plate (36) is inserted into the T-shaped guide groove (35) and is slidably connected to the T-shaped guide groove (35). A sixth bolt (37) is threadedly connected to the motor mounting cover (28) corresponding to each T-shaped guide groove (35). The sixth bolt (37) passes through the T-shaped guide groove (35) and is inserted into the T-shaped connecting plate (36).

10. The energy-saving and environment-friendly high-speed direct-drive centrifugal fan according to claim 6, wherein: A protective cover net (38) is provided outside the air inlet end of the motor mounting cover (28). The outer extension of the protective cover net (38) is bent inward and is fixedly installed on the motor mounting cover (28) by the seventh bolt (39).

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