Air suspension centrifugal blower with adjustable inlet guide vanes

Abstract

This invention relates to the field of centrifugal blower technology and discloses an air-suspended centrifugal blower with adjustable inlet guide vanes. The blower includes a base, a housing mounted on the base, a main shaft housed within the housing and supported by air bearings, and a motor for driving the main shaft rotation. It also includes a flow guide assembly mounted on the main shaft. The flow guide assembly includes a flow guide wheel fixed to the main shaft, a cover plate detachably connected to the flow guide wheel, and multiple blades evenly distributed circumferentially along the flow guide wheel. Multiple inner and outer side plates, each corresponding to a blade, are evenly distributed circumferentially on the inner and outer sides of the flow guide wheel. The inner and outer side plates are arranged opposite each other, and each set of outer side plates is fixedly mounted with a mounting seat. Multiple sets of adjustment mechanisms, each corresponding to a blade, are arranged circumferentially inside the flow guide wheel. This invention achieves adaptive matching of the blade angle to the flow rate and rotational speed through adaptive adjustment, effectively reducing airflow impact loss and flow separation loss.

Description

Technical Field

[0001] This invention relates to the field of centrifugal blower technology, and more particularly to an air-suspended centrifugal blower with adjustable inlet guide vanes. Background Technology

[0002] As a type of high-efficiency and energy-saving gas compressor, the air-suspended centrifugal blower works by utilizing the aerodynamic pressure effect generated during high-speed rotation, enabling the rotor to achieve contactless suspension operation under the support of an air film. At the same time, the centrifugal impeller converts the kinetic energy of the gas into pressure energy, thereby completing the gas compression operation. This type of blower integrates key components such as a high-speed motor, air bearings, centrifugal impellers, and guide vanes. Compared with traditional blowers, it has significant advantages such as compact structure, oil-free lubrication, low operating noise, and low maintenance costs. It is currently widely used in many industrial fields such as sewage treatment aeration, semiconductor manufacturing, and textile printing and dyeing.

[0003] In the existing technology, the guide vanes used in the air suspension centrifugal blowers are generally of a fixed angle structure. The installation angle of the guide vanes is usually based on a single rated design operating point for aerodynamic optimization design. Once the actual operating speed or flow rate deviates from the design point, the overall aerodynamic efficiency drops significantly.

[0004] Specifically, under low flow and low speed conditions, the absolute flow angle of the airflow at the impeller outlet increases, and the airflow direction becomes more circumferential. Due to the fixed installation angle of the guide vanes, the airflow impacts the suction surface of the guide vanes at a large negative angle of attack, failing to smoothly enter the flow channel. This leads to severe separation of the boundary layer of the suction surface, forming vortices. These vortices, under the action of circumferential pressure difference, rotate and develop into rotating stall vortices, blocking part of the flow channel. This causes an abnormal increase in the back pressure at the impeller outlet and a sharp increase in flow resistance. Reflected on the performance curve, the surge boundary line shifts towards the direction of high flow, causing the equipment to reach the surge boundary before the actual flow rate reaches the design minimum value, prematurely triggering surge. Under surge conditions, the airflow periodically and violently backflows and erupts, accompanied by strong vibrations and pressure pulsations, seriously threatening the stability of the air bearings and endangering the rotor system and structural safety, resulting in the equipment being unable to operate stably. Summary of the Invention

[0005] The purpose of this invention is to provide an air-suspended centrifugal blower with adjustable inlet guide vanes, in order to solve the problem of unstable performance of air-suspended centrifugal blowers with fixed-angle inlet guide vanes under non-design conditions, as mentioned in the background art.

[0006] The air-suspended centrifugal blower with adjustable inlet guide vanes provided by this invention adopts the following technical solution: An air-suspended centrifugal blower with adjustable inlet guide vanes includes a base, a housing mounted on the base, a main shaft housed within the housing and supported by air bearings, and a motor for driving the main shaft to rotate. It also includes a flow guide assembly mounted on the main shaft. The flow guide assembly includes a flow guide wheel fixed to the main shaft, a cover plate detachably connected to the flow guide wheel, and multiple blades evenly distributed circumferentially along the flow guide wheel. Multiple inner and outer side plates, each corresponding to a blade, are evenly distributed circumferentially on the inner and outer sides of the flow guide wheel, and the inner and outer side plates are arranged opposite each other. Each set of outer side plates is fixedly mounted with a mounting seat. Each blade is rotatably mounted on the mounting seat via a rotating shaft extending into the flow guide wheel. Multiple sets of adjustment mechanisms, each corresponding to a blade, are arranged circumferentially within the flow guide wheel. These adjustment mechanisms synchronously drive multiple blades to rotate around their respective corresponding rotating shafts by changing the main shaft speed, thereby changing the installation angle of the blades.

[0007] Furthermore, each set of adjustment mechanisms includes a gear fixedly connected to a rotating shaft, a gear plate meshing with the gear, and a swing arm for driving the gear plate to move. One end of the swing arm is hinged to the inside of the guide wheel via a rotating rod. A sliding groove is provided on the swing arm, and a sliding rod is slidably connected in the sliding groove. The sliding rod is fixedly connected to the gear plate, and an elastic element is provided between the swing arm and the guide wheel.

[0008] Furthermore, the elastic element includes a fixed block fixedly connected inside the guide wheel and a spring disposed between the fixed block and the swing arm, with both ends of the spring fixedly connected to the fixed block and the swing arm, respectively.

[0009] Furthermore, a sliding column is fixedly connected to the toothed plate, and a bracket corresponding to the sliding column is fixedly connected to the inner side plate. The bracket is provided with a track that slides with the sliding column, and the sliding column can slide back and forth along the track.

[0010] Furthermore, a counterweight is fixedly installed at the other end of the swing arm. The counterweight is used to generate centrifugal force when the spindle speed changes, driving the swing arm to swing around the rotating rod.

[0011] Furthermore, a limiting baffle corresponding to the swing arm is fixedly connected inside the guide wheel, and the limiting baffle abuts against the swing arm.

[0012] Furthermore, the cover plate is provided with a locking mechanism, which is used to lock the rotating shaft after the blade angle is adjusted to prevent blade angle drift. The locking mechanism includes a fixed disk fixedly connected to the guide wheel, a turntable rotatably connected to the fixed disk, multiple sets of arc-shaped guide rails evenly opened along the circumference of the turntable, a guide rod slidably connected in each set of arc-shaped guide rails, a connecting arm fixedly connected to each set of guide rods, and a friction disk fixed to the end of each set of connecting arms. Multiple sets of linear guide rails for the guide rods to slide are evenly opened along the circumference of the fixed disk. The friction disk corresponds one-to-one with the rotating shaft. The friction disk can abut against the rotating shaft in the extended position to prevent the blade from rotating, and release the abutment in the retracted position.

[0013] Furthermore, the fixed disk is also provided with an execution unit, which is used to drive the turntable to rotate relative to the fixed disk. The execution unit includes an extension plate integrally mounted on the turntable, a linkage block hinged to the end of the extension plate, and an electric push rod hinged to the fixed disk via a hinge shaft. The output end of the electric push rod is connected to the linkage block.

[0014] Furthermore, it also includes a speed sensor mounted on the spindle for detecting the spindle speed. The signal output terminal of the speed sensor is electrically connected to an external control device to transmit the detected speed signal to the external control device.

[0015] Furthermore, a convex shaft is fixedly connected to the extension plate, and a guide groove for the convex shaft to slide is provided on the fixed plate.

[0016] The beneficial effects of this invention are: By setting up a flow guiding component and adjustment mechanism, the centrifugal force generated by the rotation of the main shaft is used as the driving source and adjustment signal. The speed change is directly converted into synchronous adjustment of the blade installation angle through the swing arm, toothed plate and gear. When the speed increases, the blades are driven to open to a larger angle to smoothly guide the high-speed, near-axial airflow and reduce impact loss, thereby maintaining excellent aerodynamic performance in the high-efficiency range. When the speed decreases, the blades are closed to a smaller angle so that the leading edge matches the more oblique direction of the low-speed downflow, effectively avoiding the impact of the airflow on the suction surface at a large negative angle of attack. Through adaptive adjustment, the blade angle is adaptively matched with the flow rate and speed, effectively reducing airflow impact loss and flow separation loss. On the other hand, by actively avoiding the rotational stall caused by mismatch under low operating conditions and the resulting upward shift of the surge boundary, the fan can operate safely at a lower stable flow rate, reducing the energy waste caused by the need to use venting or recirculation to avoid surge, thereby effectively achieving energy saving.

[0017] By setting a locking mechanism and an execution unit to lock the radial contact of the blade shaft, after the blower completes dynamic adjustment and enters a certain steady-state operating condition, the blade can be fixed at the current angle, effectively eliminating the slight drift or oscillation of the blade angle that may be caused by airflow pulsation or external interference, thereby ensuring the stability of aerodynamic efficiency under steady-state operating conditions and avoiding additional flow losses caused by small angle fluctuations. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic cross-sectional view of the three-dimensional structure of the present invention; Figure 3 This is a side view of the main shaft, flow guide assembly, and speed sensor of the present invention. Figure 4 This is an exploded three-dimensional structural diagram of the guide wheel and cover plate of the present invention; Figure 5 This is an exploded three-dimensional structural diagram of the guide wheel, mounting base, rotating shaft, and blades of the present invention. Figure 6 This is a three-dimensional structural diagram of the guide wheel, blades, inner side plate, rotating shaft, and adjustment mechanism of the present invention; Figure 7 This is a partial three-dimensional structural diagram of the guide wheel, blades, and adjustment mechanism of the present invention. Figure 8 This is a three-dimensional structural diagram of the rotating shaft, gear, toothed plate, and swing arm of the present invention. Figure 9 This is a partial cross-sectional view of the front structure of the guide wheel, rotating shaft, gear, toothed plate, swing arm, rotating rod, fixing block and spring of the present invention; Figure 10 This is a three-dimensional structural diagram of the toothed plate, sliding column, bracket, and track of the present invention. Figure 11 This is a schematic diagram showing the side view of the blade angle change structure of the present invention; Figure 12 This is a three-dimensional structural diagram of the cover plate, locking mechanism, and execution unit of the present invention; Figure 13 This is an exploded three-dimensional structural diagram of the cover plate, turntable, guide rod, connecting arm, and friction disc of the present invention. Figure 14 This is a three-dimensional structural diagram of the cover plate, fixed disk, turntable and execution unit of the present invention; Figure 15 This is a three-dimensional structural diagram of the cover plate, rotating shaft, fixed disk, turntable, guide rod, connecting arm and friction disk of the present invention.

[0019] In the picture: 1. Base; 2. Housing; 3. Main shaft; 4. Motor; 5. Flow guide assembly; 51. Flow guide wheel; 52. Cover plate; 53. Blade; 54. Inner side plate; 55. Outer side plate; 56. Mounting seat; 57. Rotating shaft; 6. Adjustment mechanism; 61. Gear; 62. Gear plate; 621. Sliding column; 622. Bracket; 623. Track; 63. Swing arm; 631. Limiting stop; 64. Rotating rod; 65. Slide groove; 66. Slide rod; 67. Fixed block; 68. Spring; 69. Counterweight; 7. Locking mechanism; 71. Fixed plate; 72. Turntable; 73. Arc-shaped guide rail; 74. Guide rod; 75. Connecting arm; 76. Friction disc; 77. Linear guide rail; 8. Actuation unit; 81. Extension plate; 82. Linkage block; 83. Electric push rod; 84. Hinge shaft; 85. Protruding shaft; 86. Guide groove; 9. Speed ​​sensor. Detailed Implementation

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] Please see Figures 1-3 The present invention provides an air-suspended centrifugal blower with adjustable inlet guide vanes, including a base 1, a housing 2 disposed on the base 1, a main shaft 3 disposed in the housing 2 and supported by an air bearing, and a motor 4 for driving the main shaft 3 to rotate.

[0022] Please see Figures 3-5 It also includes a flow guide assembly 5 mounted on the main shaft 3. The flow guide assembly 5 includes a flow guide wheel 51 fixed on the main shaft 3, a cover plate 52 detachably connected to the flow guide wheel 51, and multiple blades 53 evenly distributed around the circumference of the flow guide wheel 51. Multiple inner side plates 54 and outer side plates 55, corresponding one-to-one with the blades 53, are evenly distributed around the inner and outer sides of the flow guide wheel 51. The inner side plates 54 and outer side plates 55 are arranged opposite to each other and are used to support and position the blades 53. Each set of outer side plates 55 is fixedly mounted with a mounting seat 56. The mounting seat 56 corresponds to the blade 53. Each blade 53 is rotatably mounted on the mounting seat 56 through a rotating shaft 57, and the rotating shaft 57 extends inward into the interior of the flow guide wheel 51 to adjust the angle of the blade 53.

[0023] Please see Figures 6-7 In order to adjust the installation angle of the blade 53, multiple sets of adjustment mechanisms 6 corresponding to the blade 53 are arranged circumferentially inside the guide wheel 51. The adjustment mechanism 6 drives multiple blades 53 to rotate around their respective corresponding shafts 57 synchronously by changing the rotation speed of the main shaft 3, thereby changing the installation angle of the blade 53. When the rotation speed of the main shaft 3 changes, the adjustment mechanism 6 will drive the blade 53 to rotate under the action of centrifugal force, thereby achieving the adjustment of its angle.

[0024] Further, please refer to Figures 7-9 Each adjustment mechanism 6 includes a gear 61 fixedly connected to a rotating shaft 57, a toothed plate 62 meshing with the gear 61, and a swing arm 63 for driving the toothed plate 62 to move. A limiting baffle 631 corresponding to the swing arm 63 is fixedly connected inside the guide wheel 51. The limiting baffle 631 abuts against the swing arm 63 to limit the angle of the swing arm 63 after it returns to its original position. One end of the swing arm 63 is hinged inside the guide wheel 51 through a rotating rod 64. A sliding groove 65 is provided on the swing arm 63. A sliding rod 66 is slidably connected in the sliding groove 65. The sliding rod 66 is fixedly connected to the toothed plate 62. When the swing arm 63 swings, the sliding rod 66 slides in the sliding groove 65 and drives the toothed plate 62 to move. The movement of the toothed plate 62, through meshing with the gear 61, ultimately drives the blade 53 to rotate around the rotating shaft 57, thereby changing its angle.

[0025] To provide a restoring force and ensure smooth adjustment, an elastic element is provided between the swing arm 63 and the guide wheel 51. The elastic element includes a fixed block 67 fixedly connected inside the guide wheel 51 and a spring 68 disposed between the fixed block 67 and the swing arm 63. The two ends of the spring 68 are fixedly connected to the fixed block 67 and the swing arm 63, respectively. The spring 68 deforms when the swing arm 63 is subjected to centrifugal force and provides a restoring force to reset the swing arm 63 when the centrifugal force decreases.

[0026] A counterweight 69 is fixedly installed at the other end of the swing arm 63. The counterweight 69 is used to generate centrifugal force when the speed of the main shaft 3 changes, driving the swing arm 63 to swing around the rotating rod 64. When the speed of the main shaft 3 changes, the centrifugal force on the counterweight 69 will also change accordingly, thereby driving the swing arm 63 to swing around the rotating rod 64. For example, when the speed increases, the centrifugal force increases, the counterweight 69 is thrown outward, and the swing arm 63 swings outward; when the speed decreases, the centrifugal force decreases, and the restoring force of the spring 68 causes the swing arm 63 to swing inward.

[0027] Please see Figures 9-10 A sliding column 621 is fixedly connected to the toothed plate 62, and a bracket 622 corresponding to the sliding column 621 is fixedly connected to the inner side plate 54. The bracket 622 is provided with a track 623 that slides with the sliding column 621. The sliding column 621 can slide back and forth along the track 623, thereby effectively constraining the movement direction of the toothed plate 62, preventing it from deviating, and ensuring the meshing of the gear 61 and the toothed plate 62.

[0028] Specifically, when the swing arm 63 swings outward around the rotating rod 64, the slide rod 66 slides from one end of the slide groove 65 near the rotating rod 64 to the other end. Under the limiting action of the track 623 and the slide column 621, it pushes the toothed plate 62 to move linearly along the extension direction of the track 623. The toothed plate 62 drives the rotating shaft 57 to rotate through the gear 61, thereby adjusting the angle of the blade 53.

[0029] Please see Figure 11Under high-speed operation, the spindle speed of the main shaft 3 increases significantly. At this time, the counterweight 69 in the adjustment mechanism 6 bears a huge centrifugal force, which drives the swing arm 63 to overcome the preload of the spring 68 and swing outward around the rotating rod 64. Through the cooperation of the slide groove 65 and the slide rod 66, the swing of the swing arm 63 is converted into the linear displacement of the toothed plate 62. The movement of the toothed plate 62 drives the gear 61 meshing with it to rotate. The gear 61 is fixedly connected to the rotating shaft 57, which ultimately drives the blade 53 to rotate around its rotating shaft 57 in the direction of increasing the installation angle. The adjusted blade 53 is at a larger opening angle to better guide the high-speed airflow and reduce impact loss.

[0030] Under low-speed operation, the rotational speed of the main shaft 3 decreases. At this time, the centrifugal force on the counterweight 69 is correspondingly weakened. Under the action of the elastic restoring force of the spring 68, the swing arm 63 is driven to swing inward to reset, and finally drives the blade 53 to rotate around its axis 57 in the direction of reducing the installation angle. The adjusted installation angle of the blade 53 is reduced to better match and guide the low-speed airflow.

[0031] In addition, please see Figures 12-13 A locking mechanism 7 is provided on the cover plate 52. The locking mechanism 7 is used to lock the rotating shaft 57 after the blade 53 angle is adjusted to prevent the blade 53 angle from drifting. The locking mechanism 7 includes a fixed disk 71 fixedly connected to the guide wheel 51, a turntable 72 rotatably connected to the fixed disk 71 via bearings, multiple sets of arc-shaped guide rails 73 evenly opened along the circumference of the turntable 72, guide rods 74 slidably connected in each set of arc-shaped guide rails 73, connecting arms 75 fixedly connected to each set of guide rods 74, and friction disks 76 fixed to the ends of each set of connecting arms 75. Multiple sets of linear guide rails 77 are evenly provided along the circumference of the upper part for the guide rod 74 to slide. The friction disk 76 corresponds to the rotating shaft 57 one by one. The friction disk 76 can abut against the rotating shaft 57 in the extended position to prevent the blade 53 from rotating, and release the abutment in the retracted position. When the rotating disk 72 rotates relative to the fixed disk 71, the guide rod 74 will be forced to move radially through the cooperation of the arc-shaped guide rail 73 and the linear guide rail 77, thereby driving the connecting arm 75 and the friction disk 76 to extend and retract radially. When the friction disk 76 extends and abuts against the rotating shaft 57, it can be fixed to prevent the blade 53 from rotating.

[0032] Please see Figures 13-15In order to drive the turntable 72 in the locking mechanism 7 to rotate, thereby locking or unlocking the angle of the blade 53, an execution unit 8 is also provided on the fixed disk 71. The execution unit 8 is used to drive the turntable 72 to rotate relative to the fixed disk 71. The execution unit 8 includes an extension plate 81 integrally mounted on the turntable 72, a linkage block 82 hinged to the end of the extension plate 81, and an electric push rod 83 hinged to the fixed disk 71 through a hinge shaft 84. The output end of the electric push rod 83 is connected to the linkage block 82. The electric push rod 83 converts its extension and retraction motion into the rotational motion of the turntable 72 through the linkage block 82 and the extension plate 81, thereby realizing the synchronous drive of the friction disk 76 and completing the locking or unlocking operation of multiple blades 53.

[0033] A convex shaft 85 is fixedly connected to the extension plate 81, and a guide groove 86 is provided on the fixed plate 71 for the convex shaft 85 to slide. The sliding of the convex shaft 85 in the guide groove 86 can effectively improve the stability of the turntable 72 when it rotates.

[0034] Please see Figure 3 The invention also includes a speed sensor 9 mounted on the spindle 3 for detecting the rotational speed of the spindle 3. The signal output terminal of the speed sensor 9 is electrically connected to an external control device to transmit the detected rotational speed signal to the external control device. The electric push rod 83 is also electrically connected to the external control device. The speed sensor 9 provides real-time rotational speed data to the external control device, enabling the external control device to lock or unlock the angle of the blade 53 by driving the locking mechanism 7 through the execution unit 8 according to the actual rotational speed change. When the rotational speed of the spindle 3 reaches a preset stable value, the external control device can send a signal to drive the electric push rod 83 to lock the blade 53 through the locking mechanism 7.

[0035] The specific working principle is as follows: When the motor 4 drives the spindle 3 to increase or decrease its speed and reaches the preset adjustment trigger condition, the change in centrifugal force sensed by the counterweight 69 drives the swing arm 63 to swing. This, in turn, through the meshing of the toothed plate 62 and the gear 61, drives multiple blades 53 to rotate synchronously around their respective shafts 57. Simultaneously, the speed sensor 9 continuously monitors the real-time speed information of the spindle 3. Once the speed sensor 9 detects that the spindle 3's speed change remains stable—that is, the speed value remains relatively stable within a preset small tolerance range—this... After a short, preset period of stable operation, the speed sensor 9 sends a signal to the external control device. Upon receiving the signal, the external control device sends a start command to the electric push rod 83. Once started, the electric push rod 83 drives the turntable 72 to rotate via the linkage block 82 and the extension plate 81. The rotation of the turntable 72 forces the guide rod 74 to move radially through the cooperation of the arc-shaped guide rail 73 and the linear guide rail 77. This, in turn, causes the connecting arm 75 and its end friction disc 76 to extend radially in sync. The friction disc 76 abuts against the rotating shaft 57, thereby locking the blade 53.

[0036] When the operating conditions of the blower system change again, causing the speed of the main shaft 3 to change, and the magnitude or rate of change exceeds the preset threshold, the speed sensor 9 detects this situation and transmits the signal to the external control device. After receiving this signal, the external control device commands the electric push rod 83 to move in the opposite direction, thereby driving the friction disc 76 to retract, releasing the contact with the rotating shaft 57, and allowing the blade 53 to return to a free rotation state.

[0037] After the shaft 57 is unlocked, the adjusting mechanism 6 will drive the blade 53 to rotate again based on the centrifugal force generated by the new rotation speed. When the angle of the blade 53 is adjusted to the correct position by the adjusting mechanism 6, and the speed sensor 9 detects that the main shaft 3 speed has entered a new stable state, the external control device will repeat the above steps and command the electric push rod 83 to start again, pushing the friction disk 76 to abut against the shaft 57, so that the blade 53 is locked at the new angle position.

[0038] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An air-suspension centrifugal blower with adjustable inlet guide vanes, comprising a base (1), a casing (2) arranged on the base (1), a main shaft (3) arranged in the casing (2) and supported by air bearings, and a motor (4) for driving the main shaft (3) to rotate, characterized in that, It also includes a flow guide assembly (5) disposed on the main shaft (3). The flow guide assembly (5) includes a flow guide wheel (51) fixed on the main shaft (3), a cover plate (52) detachably connected to the flow guide wheel (51), and a plurality of blades (53) evenly distributed along the circumference of the flow guide wheel (51). The inner and outer sides of the flow guide wheel (51) are evenly distributed along the circumference with a plurality of inner side plates (54) and outer side plates (55) corresponding one-to-one with the blades (53). The inner side plates (54) and outer side plates (55) are arranged opposite to each other. Each group of outer side plates... Mounting bases (56) are fixedly installed on the plate (55). Each blade (53) is rotatably mounted on the mounting base (56) via a rotating shaft (57). The rotating shaft (57) extends into the guide wheel (51). Multiple sets of adjustment mechanisms (6) corresponding to the blades (53) are arranged circumferentially inside the guide wheel (51). The adjustment mechanism (6) drives multiple blades (53) to rotate around their respective corresponding rotating shafts (57) synchronously by changing the rotation speed of the main shaft (3) to change the installation angle of the blades (53).

2. An air-swinging centrifugal blower with adjustable inlet guide vanes according to claim 1, characterized in that, Each adjustment mechanism (6) includes a gear (61) fixedly connected to a rotating shaft (57), a toothed plate (62) meshing with the gear (61), and a swing arm (63) for driving the toothed plate (62) to move. One end of the swing arm (63) is hinged to the inside of the guide wheel (51) through a rotating rod (64). A sliding groove (65) is provided on the swing arm (63), and a sliding rod (66) is slidably connected in the sliding groove (65). The sliding rod (66) is fixedly connected to the toothed plate (62), and an elastic element is provided between the swing arm (63) and the guide wheel (51).

3. An air-swinging centrifugal blower with adjustable inlet guide vanes according to claim 2, characterized in that, The elastic element includes a fixed block (67) fixedly connected inside the guide wheel (51) and a spring (68) disposed between the fixed block (67) and the swing arm (63), with both ends of the spring (68) fixedly connected to the fixed block (67) and the swing arm (63) respectively.

4. The air suspension centrifugal blower with adjustable inlet guide vanes according to claim 2, characterized in that, A sliding column (621) is fixedly connected to the toothed plate (62), and a bracket (622) corresponding to the sliding column (621) is fixedly connected to the inner side plate (54). A track (623) is provided on the bracket (622) to slide and cooperate with the sliding column (621). The sliding column (621) can slide back and forth along the track (623).

5. The air-swinging centrifugal blower with adjustable inlet guide vanes according to claim 2, characterized in that, A counterweight (69) is fixedly installed at the other end of the swing arm (63). The counterweight (69) is used to generate centrifugal force when the rotation speed of the main shaft (3) changes, driving the swing arm (63) to swing around the rotating rod (64).

6. The air suspension centrifugal blower with adjustable inlet guide vanes according to claim 2, characterized in that, The guide wheel (51) is fixedly connected with a limiting baffle (631) corresponding to the swing arm (63), and the limiting baffle (631) abuts against the swing arm (63).

7. The air suspension centrifugal blower with adjustable inlet guide vanes according to claim 1, characterized in that, The cover plate (52) is provided with a locking mechanism (7). The locking mechanism (7) is used to lock the rotating shaft (57) after the blade (53) angle is adjusted to prevent the blade (53) angle from drifting. The locking mechanism (7) includes a fixed disk (71) fixedly connected to the guide wheel (51), a turntable (72) rotatably connected to the fixed disk (71), multiple sets of arc-shaped guide rails (73) evenly opened along the circumference of the turntable (72), and sliding connections within each set of arc-shaped guide rails (73). The fixed disk (71) has a guide rod (74), a connecting arm (75) fixedly connected to each set of guide rods (74), and a friction disk (76) fixed at the end of each set of connecting arms (75). Multiple sets of linear guide rails (77) for sliding of the guide rods (74) are evenly opened along the circumference on the fixed disk (71). The friction disk (76) corresponds one-to-one with the rotating shaft (57). The friction disk (76) can abut against the rotating shaft (57) in the extended position to prevent the blade (53) from rotating, and release the abutment in the retracted position.

8. The air-suspended centrifugal blower with adjustable inlet guide vanes according to claim 7, characterized in that, An execution unit (8) is also provided on the fixed disk (71). The execution unit (8) is used to drive the turntable (72) to rotate relative to the fixed disk (71). The execution unit (8) includes an extension plate (81) integrally disposed on the turntable (72), a linkage block (82) hinged to the end of the extension plate (81), and an electric push rod (83) hinged to the fixed disk (71) via a hinge shaft (84). The output end of the electric push rod (83) is connected to the linkage block (82).

9. The air-suspended centrifugal blower with adjustable inlet guide vanes according to claim 8, characterized in that, It also includes a speed sensor (9) installed on the spindle (3) for detecting the speed of the spindle (3). The signal output terminal of the speed sensor (9) is electrically connected to an external control device to transmit the detected speed signal to the external control device.

10. The air-suspended centrifugal blower with adjustable inlet guide vanes according to claim 8, characterized in that, A convex shaft (85) is fixedly connected to the extension plate (81), and a guide groove (86) for sliding the convex shaft (85) is provided on the fixed plate (71).

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