Variable-frequency speed-regulating multi-stage centrifugal blower

Abstract

The invention relates to a variable-frequency speed-regulating multistage centrifugal blower, and relates to the technical field of blowers. The device comprises a workbench and a shell arranged on the workbench, a plurality of air shells are arranged in the shell, an impeller is arranged in each air shell, the impellers can rotate in the air shells, the two ends of the shell are communicated with an air inlet and an air outlet respectively, the air shells are located between the air inlet and the air outlet, and a plurality of baffles used for shielding the air inlet are arranged in the air inlet. The baffle is rotationally connected to the inner wall of the air inlet, an adjusting assembly connected with the baffle is arranged on the shell and used for driving the baffle to rotate, and a driving assembly used for driving the multiple impellers to rotate synchronously is arranged on the workbench. The air blower has the effect of conveniently adjusting the flow of the air blower.

Description

Technical Field

[0001] The present application relates to the field of blowers, and in particular to a variable frequency speed regulation multi-stage centrifugal blower. Background Art

[0002] Air conveying equipment plays a vital role in industrial production and many other fields. As one of the most common air conveying equipment, the development of centrifugal blower technology is of great significance in improving production efficiency, reducing energy consumption, and ensuring stable operation of the system.

[0003] In traditional multi-stage centrifugal blower designs, air volume regulation is typically achieved by varying the fan speed. However, precise fan speed control is costly and difficult, and it is not convenient for flow rate regulation, so this method needs improvement. Summary of the Invention

[0004] In order to improve the problem of inconvenience in blower flow regulation, the present application provides a variable frequency speed regulation multi-stage centrifugal blower.

[0005] The present application provides a variable frequency speed regulation multi-stage centrifugal blower adopts the following technical solution: A variable frequency speed regulation multi-stage centrifugal blower includes a workbench and a shell arranged on the workbench, wherein a plurality of wind shells are arranged in the shell, each of the wind shells is provided with an impeller, and the impeller can rotate in the wind shell, and the two ends of the shell are respectively connected with an air inlet and an air outlet, the wind shell is located between the air inlet and the air outlet, and the air inlet is provided with a plurality of baffles for blocking the air inlet, and the baffles are rotatably connected to the inner wall of the air inlet, and the shell is provided with an adjustment component connected to the baffle, and the adjustment component is used to drive the baffle to rotate, and the workbench is provided with a drive component for driving the plurality of impellers to rotate synchronously.

[0006] By adopting the above technical solution, when in use, the drive assembly is activated to drive the impeller to rotate, thereby drawing air outside the housing into the housing through the air inlet. The centrifugal force generated by the rotation of the impeller squeezes the air, and after reaching a certain air volume and pressure, it is discharged from the air outlet. When the flow rate of the blower needs to be adjusted, the adjustment assembly is activated to drive the multiple baffles to rotate simultaneously. The baffles rotated to different angles can effectively adjust the air inlet area of the air inlet to adjust the air volume, thereby achieving the adjustment of the blower flow rate.

[0007] Optionally, several of the impellers are coaxial, and the drive assembly includes a drive motor and a drive rod, the drive motor is arranged on the workbench, the drive rod is fixed coaxially with the several impellers, the drive motor is used to drive the drive rod to rotate, and a mounting block is provided on the shell, the mounting block is coaxial with the air inlet and is fixed to the inner wall of the air inlet through the mounting rod, and the end of the drive rod is inserted in the mounting block and can rotate on the mounting block.

[0008] By adopting the above technical solution, the drive motor is started to drive the drive rod to rotate, so that several impellers rotate synchronously. The mounting block plays a role of positioning support, making the drive rod more stable.

[0009] Optionally, an annular groove is formed between the air inlet and the mounting block, and several baffles are located in the annular groove, and the several baffles are arranged in sequence along the circumference of the annular groove. When adjacent baffles are fitted together, they are used to seal the annular groove. The baffles are rotatably connected to the inner wall of the air inlet through a rotating shaft, and the adjustment assembly is connected to the rotating shaft.

[0010] By adopting the above technical solution, when adjacent baffles are in contact with each other, the entire annular groove is in a closed state. When adjusting the flow of the blower, the adjustment component is started to drive the rotating shaft to rotate, thereby driving several baffles to rotate the same angle at the same time, so that the gap between adjacent baffles changes, thereby changing the opening size of the air inlet, thereby realizing the adjustment of the blower flow.

[0011] Optionally, the adjusting assembly includes an adjusting gear and several rotating gears, the adjusting gear is embedded in the shell, and the adjusting gear is coaxial with the mounting block, the adjusting gear can rotate on the shell, several rotating gears correspond to the rotating shaft one by one, the rotating gears are coaxially fixed on the corresponding rotating shaft, the rotating gear is meshed with the adjusting gear, a worm gear is fixed on the adjusting gear, a worm is rotatably connected to the shell, and the worm is meshed with the worm gear.

[0012] By adopting the above technical solution, when the worm is driven to rotate, the worm is driven to rotate, thereby causing the adjusting gear to rotate. Since several rotating gears are engaged with the adjusting gear, several rotating gears are caused to rotate at the same time, so that the rotating shaft drives several baffles to rotate at the same angle at the same time, that is, the distance between adjacent baffles is equal, thereby dividing the air inlet into multiple air inlet holes of equal size, which can ensure the working effect of the air inlet, make the flow rate of the diverted air flow uniform, and thus make the flow rate of the air flow flowing into the shell more uniform, effectively reduce the noise generated by the impact of the air flow, and significantly increase the air flow volume.

[0013] Optionally, a filter plate is provided on the outer side wall of the shell, and the filter plate is used to seal the air inlet.

[0014] By adopting the above technical solution, the filter plate plays a filtering role, so that impurities cannot enter the shell through the air inlet, so that the impurities will not be stuck on the impeller and affect the rotation of the impeller, so as to transport the gas.

[0015] Optionally, the driving motor is connected to the driving rod through a speed regulating assembly, and the speed regulating assembly includes a speed regulating gear and a linkage gear. The speed regulating gear is coaxially fixed to the output shaft of the driving motor, and the linkage gear is coaxially fixed to the driving rod. The diameter of the speed regulating gear is larger than the linkage gear, and the speed regulating gear is meshed with the linkage gear.

[0016] By adopting the above technical solution, the drive motor is started, driving the speed regulating gear to rotate, which in turn drives the linkage gear to rotate synchronously, thereby rotating the drive rod, that is, the multiple impellers rotate simultaneously, achieving a change in wind pressure and discharge. The speed regulating gear drives the smaller linkage gear to rotate. Due to the different number of teeth on the speed regulating gear and the linkage gear, the speed is different, thus achieving a speed increase effect, expanding the range of values within which the impeller speed can be adjusted, and improving rotation accuracy.

[0017] Optionally, the end of the driving rod is inserted into a mounting block and can rotate on the mounting block. A buffer component is provided on the mounting block, and the buffer component is in contact with the driving rod to limit vibration of the driving rod.

[0018] By adopting the above technical solution, when the driving rod rotates, the driving rod will have a slight deflection due to construction errors. At this time, the buffer assembly can provide the driving rod with a swing margin and buffer the impact force of the driving rod vibration, so that the driving rod is not easy to cause the impeller to shake violently and be damaged, thereby making it less likely for the casing and other components to resonate, thereby extending the service life of the entire blower, and reducing noise while buffering and shock absorbing.

[0019] Optionally, the buffer assembly includes a mounting sleeve and several telescopic rods, the mounting sleeve is mounted on the driving rod, the several telescopic rods are radially arranged with the central axis of the mounting sleeve as the center, the telescopic rods are arranged along the tangential direction of the mounting sleeve, the telescopic rod includes a connecting rod and a connecting sleeve, one end of the connecting rod is hinged to the mounting block, and the other end is inserted in the connecting sleeve, the end of the connecting rod is connected to the inner wall of the connecting sleeve through a telescopic spring, and the end of the connecting sleeve away from the connecting rod is hinged to the mounting sleeve.

[0020] By adopting the above technical solution, when the driving rod shakes during its rotation, it drives the mounting sleeve to move on the mounting block, causing the center position of the mounting sleeve to change continuously. During the movement of the mounting sleeve, some of the telescopic rods are stretched, while the remaining telescopic rods are compressed. The telescopic springs in the corresponding direction of the compression side are compressed to store impact energy, while the springs in the symmetrical position on the tension side are stretched to generate a reverse restraining force.

[0021] At the same time, due to the movement of the mounting sleeve, the position of the connection point between the telescopic rod and the mounting sleeve also changes, causing the telescopic rod to deflect as a whole, that is, the telescopic rod is subjected to shear force, which is more efficient in resisting lateral displacement than the axial arrangement. In this process, the change in the length of the telescopic rod and the deflection of the telescopic rod cause the shaking of the drive rod to be subject to greater resistance, resulting in a damping effect, thereby playing a role in shock absorption and buffering, so that the drive rod is not easily damaged.

[0022] Optionally, a magnet is fixed on the inner wall of the mounting sleeve, and the magnet repels the driving rod.

[0023] By employing this technical solution, magnets suspend the drive rod within the mounting sleeve. When the drive rod rotates and vibrates, it displaces within the sleeve. The magnetic repulsion between the drive rod and the magnet creates a non-contact resistance, converting displacement energy into magnetic field potential energy. This conversion process is faster than traditional mechanical springs, eliminates frictional losses, and allows for dynamic response by adjusting the magnetic field strength. The repulsion between the magnet and the drive rod prevents direct contact with the mounting sleeve, avoiding the metal fatigue and rubber aging issues associated with traditional shock absorbers and resulting in greater long-term stability.

[0024] Optionally, a mounting hole is provided on the inner wall of the shell, and the end of the driving rod away from the mounting block is inserted into the mounting hole. A plurality of buffer blocks are provided in the mounting hole, and the buffer blocks are ball-hinged on the inner wall of the mounting hole. The plurality of buffer blocks are arranged in sequence along the circumference direction of the driving rod, and the driving rod can abut against the buffer blocks.

[0025] By adopting this technical solution, the buffer blocks form a 360-degree annular damping zone that covers radial displacement of the drive rod in any direction. When the drive rod vibrates, it contacts and squeezes some of the buffer blocks, causing them to deflect about the connection point between the buffer block and the inner wall of the mounting hole. This cushions the displacement of the drive rod and achieves a shock-absorbing effect.

[0026] In summary, this application has at least one of the following beneficial effects: 1. When the worm is driven to rotate, it drives the worm to rotate, thereby causing the adjusting gear to rotate. Since several rotating gears are engaged with the adjusting gear, the several rotating gears rotate at the same time, causing the rotating shaft to drive several baffles to rotate at the same angle at the same time, that is, the distances between adjacent baffles are equal, thereby dividing the air inlet into multiple air inlet holes of equal size, which can ensure the working effect of the air inlet, make the flow rate of the diverted air flow uniform, and then make the flow rate of the air flow into the shell more uniform, effectively reducing the noise generated by the impact of the air flow, and at the same time significantly increasing the air flow rate; 2. When the drive rod rotates and shakes, it causes the mounting sleeve to move on the mounting block, causing the center of the sleeve to continuously change position. During this movement, some of the telescopic rods are stretched, while others are compressed. The corresponding telescopic springs on the compression side are compressed, storing impact energy, while the springs symmetrically located on the tension side are stretched, generating a reverse restraining force. Simultaneously, the movement of the mounting sleeve changes the position of the connection point between the telescopic rod and the mounting sleeve, causing the entire telescopic rod to deflect. This means the rod is subject to shear forces, resisting lateral displacement more effectively than an axial arrangement. During this process, the change in length and deflection of the telescopic rod create significant resistance to the drive rod's shaking, creating a damping effect that acts as a shock absorber and buffer, preventing damage to the drive rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural diagram of a variable frequency speed regulation multi-stage centrifugal blower according to an embodiment of the present application; Figure 2 This is a structural cross-sectional view of a variable frequency speed regulation multi-stage centrifugal blower according to an embodiment of the present application; Figure 3 It is a structural diagram of the speed regulating component; Figure 4 Schematic diagram of the structure of the buffer component.

[0028] In the figure: 10, workbench; 20, shell; 21, air inlet; 22, air outlet; 23, filter plate; 30, baffle; 31, rotating shaft; 40, adjusting assembly; 41, adjusting gear; 411, worm gear; 412, worm; 42, rotating gear; 50, driving assembly; 51, driving motor; 52, driving rod; 60, mounting block; 61, mounting hole; 70, speed regulating assembly; 71, speed regulating gear; 72, linkage gear; 80, buffer assembly; 81, mounting sleeve; 811, magnet; 82, telescopic rod; 821, connecting rod; 822, connecting sleeve; 823, telescopic spring; 90, buffer block; 110, wind casing; 120, impeller. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-4 This application is described in further detail.

[0030] The embodiment of the present application discloses a variable frequency speed regulating multi-stage centrifugal blower. Figure 1 and Figure 2The variable frequency speed regulation multi-stage centrifugal blower includes a workbench 10, a shell 20, a wind shell 110, an impeller 120, an air inlet 21, an air outlet 22, a baffle 30, an adjustment component 40 and a drive component 50. Among them, the workbench 10 plays the role of supporting the entire blower, the shell 20 is set on the workbench 10, the wind shell 110 is set in the shell 20, the impeller 120 can rotate in the wind shell 110, the air inlet 21 and the air outlet 22 are respectively connected to the two ends of the shell 20 in the length direction, and the wind shell 110 is located between the air inlet 21 and the air outlet 22. In this way, air can enter from the air inlet 21, pass through the wind housing 110, be accelerated by the impeller 120, and then be discharged from the air outlet 22 to achieve the purpose of conveying air; the baffle 30 is arranged in the air inlet 21 to cover the air inlet 21, and is rotatably connected to the inner wall of the air inlet 21, and the adjustment component 40 is arranged on the shell 20 and connected to the baffle 30, which can drive the baffle 30 to rotate, thereby adjusting the air intake volume, and then adjusting the air volume of the blower; the drive component 50 is arranged on the workbench 10, and is used to drive several impellers 120 to rotate synchronously to ensure the stable operation of the blower.

[0031] Reference Figure 1 and Figure 2 Specifically, several wind shells 110 are arranged in sequence along the length direction of the shell 20, and the impellers 120 are installed in the wind shells 110. The several impellers 120 are coaxial. When the impellers 120 rotate, they will drive the surrounding air to rotate together, forming centrifugal force, so that the air is discharged from the edge of the wind shell 110, thereby realizing air transportation.

[0032] Reference Figure 1 and Figure 2 The drive assembly 50 includes a drive motor 51 and a drive rod 52. The drive motor 51 is fixed to the workbench 10 via bolts. The drive rod 52 is coaxially fixed to the impellers 120. The drive motor 51 is used to drive the drive rod 52 to rotate, thereby driving the impellers 120 to rotate. A mounting block 60 is provided on the housing 20. The mounting block 60 is coaxial with the air inlet 21 and is fixed to the inner wall of the air inlet 21 via the mounting rod. The end of the drive rod 52 is inserted into the mounting block 60 and can rotate on the mounting block 60. The mounting block 60 supports and positions the drive rod 52, ensuring stable rotation of the drive rod 52.

[0033] Reference Figure 2 and Figure 3A speed regulating assembly 70 is further disposed between the drive motor 51 and the drive rod 52. The speed regulating assembly 70 includes a speed regulating gear 71 and a linkage gear 72. The speed regulating gear 71 is coaxially fixed to the output shaft of the drive motor 51, and the linkage gear 72 is coaxially fixed to the drive rod 52. The diameter of the speed regulating gear 71 is larger than that of the linkage gear 72, and the speed regulating gear 71 and the linkage gear 72 mesh with each other. This gear transmission method allows the speed of the drive rod 52 to be adjusted. The transmission ratio can be adjusted to suit different working scenarios by selecting speed regulating gears 71 and linkage gears 72 of different diameters according to actual needs.

[0034] Reference Figure 2 and Figure 4 An annular groove is formed between the air inlet 21 and the mounting block 60. Several baffles 30 are located in the annular groove, and the several baffles 30 are arranged in sequence along the circumference of the annular groove. When adjacent baffles 30 are in contact with each other, they are used to block the annular groove. The baffles 30 are rotatably connected to the inner wall of the air inlet 21 through the rotating shaft 31, and the adjusting assembly 40 is connected to the rotating shaft 31.

[0035] Reference Figure 2 and Figure 4 Specifically, the adjustment assembly 40 includes an adjustment gear 41 and a plurality of rotating gears 42. The adjustment gear 41 is embedded in the housing 20 and is coaxial with the mounting block 60, and can rotate on the housing 20. The rotating gears 42 correspond to the rotating shafts 31 one by one and are coaxially fixed on the corresponding rotating shafts 31. The rotating gears 42 are meshed with the adjustment gears 41. When the adjustment gear 41 rotates, it drives the rotating gear 42 to rotate, and then drives the rotating shaft 31 and the baffle 30 to rotate. A worm gear 411 is fixedly sleeved on the adjustment gear 41, and a worm 412 is rotatably connected to the housing 20, and the worm 412 is meshed with the worm gear 411.

[0036] By rotating the worm 412, the worm wheel 411 and the adjusting gear 41 can be driven to rotate. Since the multiple rotating gears 42 are engaged with the adjusting gear 41, the multiple rotating gears 42 can rotate at the same time, so that the rotating shaft 31 drives the multiple baffles 30 to rotate at the same angle at the same time, that is, the distance between adjacent baffles 30 is equal, thereby dividing the air inlet into multiple air inlet holes of equal size, which can ensure the working effect of the air inlet, make the flow rate of the diverted air flow uniform, and thus make the flow rate of the air flow flowing into the shell 20 more uniform, effectively reduce the noise generated by the impact of the air flow, and significantly increase the air flow volume.

[0037] Reference Figure 2 and Figure 4To prevent larger impurities in the air outside the housing 20 from entering the housing 20 through the air inlet 21 and attaching to the agitating impeller 120, thereby restricting its rotation, a filter plate 23 is detachably connected to the outer wall of the housing 20 via bolts. The filter plate 23 covers the entire air inlet 21. The gaps in the filter plate 23 effectively filter out dust, impurities, and other foreign matter from the air, preventing them from entering the blower interior and protecting components such as the impeller 120 and the blower housing 110 from damage.

[0038] Reference Figure 2 and Figure 4 Due to construction errors, it is difficult to ensure the straightness of the drive rod 52. When the drive rod 52 is driven to rotate, the drive rod 52 is very likely to shake. In order to prevent the vibration of the drive rod 52 from causing the entire blower to vibrate and cause structural damage, a buffer assembly 80 is provided on the mounting block 60. The buffer assembly 80 includes a mounting sleeve 81 and a plurality of telescopic rods 82. The mounting sleeve 81 is mounted on the drive rod 52. The plurality of telescopic rods 82 are radially arranged with the central axis of the mounting sleeve 81 as the center of the circle. The telescopic rods 82 are arranged along the tangent direction of the mounting sleeve 81. The telescopic rod 82 includes a connecting rod 821 and a connecting sleeve 822. One end of the connecting rod 821 is hinged to the mounting block 60, and the other end is inserted into the connecting sleeve 822. The end of the connecting rod 821 is connected to the inner wall of the connecting sleeve 822 by a telescopic spring 823. The end of the connecting sleeve 822 away from the connecting rod 821 is hinged to the mounting sleeve 81. In addition, a magnet 811 is fixed on the inner wall of the mounting sleeve 81 , and the magnet 811 repels the driving rod 52 .

[0039] When the driving rod 52 vibrates, the telescopic rod 82 can buffer the vibration by the expansion and contraction of the telescopic spring 823. At the same time, the repulsive force of the magnet 811 can also reduce the contact and friction between the driving rod 52 and the mounting sleeve 81, further reducing the vibration.

[0040] Reference Figure 2 and Figure 3 , and the other end of the driving rod 52 is provided with a plurality of buffer blocks 90. A mounting hole 61 is provided on the inner wall of the shell 20. The end of the driving rod 52 away from the mounting block 60 is inserted into the mounting hole 61. A plurality of buffer blocks 90 are provided in the mounting hole 61. The buffer blocks 90 are spherically hinged on the inner wall of the mounting hole 61. The plurality of buffer blocks 90 are arranged in sequence along the circumference of the driving rod 52, and the driving rod 52 can abut against the buffer blocks 90. The plurality of buffer blocks 90 form a 360° annular damping belt, which can cover the radial displacement of the driving rod 52 in any direction. When the driving rod 52 vibrates, the driving rod 52 contacts part of the buffer blocks 90 and squeezes the buffer blocks 90, causing the buffer blocks 90 to deflect with the connection point between the buffer blocks 90 and the inner wall of the mounting hole 61 as the axis, thereby buffering the displacement of the driving rod 52 and achieving a shock absorption effect.

[0041] The implementation principle of a variable frequency speed regulation multi-stage centrifugal blower in an embodiment of the present application is as follows: the impeller 120 is driven to rotate synchronously by the drive assembly 50, and air is sucked in from the air inlet 21 and discharged from the air outlet 22 after passing through the wind casing 110. By adjusting the rotation angle of the baffle 30 by the adjustment assembly 40, the intake air volume can be precisely controlled, thereby achieving the adjustment of the air volume. Compared with the traditional air volume adjustment method, the high cost and energy loss problems caused by the use of complex speed control devices and throttle valves are avoided. At the same time, the drive assembly 50 ensures the synchronous rotation of the impeller 120, improves the transmission efficiency and stability, improves the working efficiency and service life of the blower as a whole, and reduces energy consumption.

[0042] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A variable frequency speed regulating multi-stage centrifugal blower, characterized in that: The invention comprises a workbench (10) and a shell (20) arranged on the workbench (10), wherein a plurality of wind shells (110) are arranged in the shell (20), and each wind shell (110) is provided with an impeller (120), and the impeller (120) can rotate in the wind shell (110), and the two ends of the shell (20) are respectively connected with an air inlet (21) and an air outlet (22), and the wind shell (110) is located between the air inlet (21) and the air outlet (22). A plurality of baffles (30) for shielding the air inlet (21) are provided in the air inlet (21), the baffles (30) being rotatably connected to the inner wall of the air inlet (21), an adjusting assembly (40) connected to the baffles (30) being provided on the housing (20), the adjusting assembly (40) being used to drive the baffles (30) to rotate, and a driving assembly (50) for driving the plurality of impellers (120) to rotate synchronously is provided on the workbench (10).

2. The variable frequency speed regulating multi-stage centrifugal blower according to claim 1, characterized in that: The plurality of impellers (120) are coaxial, the driving assembly (50) comprises a driving motor (51) and a driving rod (52), the driving motor (51) is arranged on the workbench (10), the driving rod (52) is coaxially fixed with the plurality of impellers (120), the driving motor (51) is used to drive the driving rod (52) to rotate, a mounting block (60) is provided on the housing (20), the mounting block (60) is coaxial with the air inlet (21) and is fixed to the inner wall of the air inlet (21) through the mounting rod, and the end of the driving rod (52) is inserted into the mounting block (60) and can rotate on the mounting block (60).

3. The variable frequency speed regulating multi-stage centrifugal blower according to claim 2, characterized in that: An annular groove is formed between the air inlet (21) and the mounting block (60), and a plurality of baffles (30) are located in the annular groove. The baffles (30) are arranged in sequence along the circumference of the annular groove. When adjacent baffles (30) are attached to each other, they are used to block the annular groove. The baffles (30) are rotatably connected to the inner wall of the air inlet (21) via a rotating shaft (31), and the adjusting assembly (40) is connected to the rotating shaft (31).

4. The variable frequency speed regulation multi-stage centrifugal blower according to claim 3, characterized in that: The adjusting assembly (40) comprises an adjusting gear (41) and a plurality of rotating gears (42). The adjusting gear (41) is embedded in the housing (20), and the adjusting gear (41) is coaxial with the mounting block (60). The adjusting gear (41) can rotate on the housing (20). The plurality of rotating gears (42) correspond to the rotating shaft (31) one by one. The rotating gears (42) are coaxially fixed on the corresponding rotating shaft (31). The rotating gears (42) mesh with the adjusting gear (41). A worm wheel (411) is fixedly sleeved on the adjusting gear (41). A worm (412) is rotatably connected to the housing (20), and the worm (412) meshes with the worm wheel (411).

5. The variable frequency speed regulation multi-stage centrifugal blower according to claim 1, characterized in that: A filter plate (23) is provided on the outer side wall of the housing (20), and the filter plate (23) is used to seal the air inlet (21).

6. The variable frequency speed regulation multi-stage centrifugal blower according to claim 3, characterized in that: The driving motor (51) is connected to the driving rod (52) via a speed regulating assembly (70). The speed regulating assembly (70) comprises a speed regulating gear (71) and a linkage gear (72). The speed regulating gear (71) is coaxially fixed to the output shaft of the driving motor (51). The linkage gear (72) is coaxially fixed to the driving rod (52). The diameter of the speed regulating gear (71) is larger than that of the linkage gear (72). The speed regulating gear (71) and the linkage gear (72) are meshed.

7. The variable frequency speed regulation multi-stage centrifugal blower according to claim 6, characterized in that: The end of the driving rod (52) is inserted into the mounting block (60) and can rotate on the mounting block (60). The mounting block (60) is provided with a buffer assembly (80), and the buffer assembly (80) contacts the driving rod (52) and is used to limit the vibration of the driving rod (52).

8. The variable frequency speed regulating multi-stage centrifugal blower according to claim 7, characterized in that: The buffer assembly (80) includes a mounting sleeve (81) and a plurality of telescopic rods (82). The mounting sleeve (81) is sleeved on the driving rod (52). The plurality of telescopic rods (82) are radially arranged with the central axis of the mounting sleeve (81) as the center of the circle. The telescopic rods (82) are arranged along the tangent direction of the mounting sleeve (81). The telescopic rods (82) include a connecting rod (821) and a connecting sleeve (822). One end of the connecting rod (821) is hinged on the mounting block (60), and the other end is inserted into the connecting sleeve (822). The end of the connecting rod (821) is connected to the inner wall of the connecting sleeve (822) through a telescopic spring (823). The end of the connecting sleeve (822) away from the connecting rod (821) is hinged on the mounting sleeve (81).

9. The variable frequency speed regulating multi-stage centrifugal blower according to claim 8, characterized in that: A magnet (811) is fixed on the inner wall of the mounting sleeve (81), and the magnet (811) repels the driving rod (52).

10. The variable frequency speed regulation multi-stage centrifugal blower according to claim 2, characterized in that: A mounting hole (61) is provided on the inner wall of the housing (20), and one end of the driving rod (52) away from the mounting block (60) is inserted into the mounting hole (61). A plurality of buffer blocks (90) are provided in the mounting hole (61), and the buffer blocks (90) are spherically hinged on the inner wall of the mounting hole (61). The plurality of buffer blocks (90) are arranged in sequence along the circumference direction of the driving rod (52), and the driving rod (52) can abut against the buffer blocks (90).

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