A low-pressure fan with energy saving and noise reduction

Abstract

The present invention discloses an energy-saving and noise-reducing low-pressure fan, which relates to the field of fans and comprises a base, wherein a driving member is arranged at the upper end of the base, a transmission member is arranged at the output end of the driving member, and a support block is arranged at one end of the transmission member away from the driving member, a driving cylinder is arranged at the end of the support block, and a protective component is rotatably installed on the inner wall of the driving cylinder, and the end of the transmission member is limited by the protective component; the energy-saving and noise-reducing low-pressure fan limits an adjustment plate by a push block and a limiting block, and then adjusts the position of the push block so that the part surrounded by the adjustment plate is in a forward cone or a reverse cone, and reduces the airflow velocity and pressure loss by gradually increasing the cross-sectional area of ​​the airflow channel, and accelerates the airflow by gradually reducing the cross-sectional area of ​​the airflow channel, thereby improving the efficiency of the fan and reducing the noise.

Description

Technical Field

[0001] The invention relates to fan technology, and in particular to an energy-saving and noise-reducing low-pressure fan. Background Art

[0002] A fan is a machine that relies on input mechanical energy to increase gas pressure and discharge gas. It is a driven three-dimensional machine. Fans are mainly used for ventilation in various fields of the national economy and various places such as metallurgy, petrochemicals, electricity, urban rail transit, textiles, and shipping. Fans are very important and are used in various places. Customers demand high efficiency, low noise, long life and low price for fans. As people's requirements for the working environment continue to increase, they also pay more attention to noise pollution. The fans that need to be used can reduce noise pollution, requiring more noise reduction measures in the use and design of fans.

[0003] A Chinese invention patent with publication number CN116928148B discloses an energy-saving and noise-reducing low-pressure fan. The energy-saving and noise-reducing low-pressure fan drives a cam to rotate by rotating a driving shaft, so that the cam drives a connecting plate to swing. The swinging connecting plate drives a piston to move back and forth up and down in a delivery pipe. When the piston moves up in the delivery pipe, water in a liquid storage tank is extracted through a water inlet pipe. When the piston moves down in the delivery pipe, the extracted water is discharged into a liquid storage chamber in a volute through a water outlet pipe. The delivery part can act as a water pump, and the piston contacts the water when moving up and down in the delivery pipe. The vibration absorption and buffering characteristics of the water are used to improve the rotation stability of the output end of the drive motor, and the noise generated during the operation of the drive motor is weakened, so as to further improve the noise reduction effect of the fan. When the fan is running, the movable base plate is displaced relative to the fixed base plate, and the shock-absorbing struts buffer the vibration generated thereby. When the movable base plate drives the volute to move up and down, the driven gear on the rotating shaft meshes with the rack plate on the fixed base plate for transmission, so that the rotating shaft drives the breaking blades to rotate in the liquid storage chamber, so that the breaking blades break large air bubbles in the water body, slowing down the speed at which the air overflows the water body, further reducing the air volume at the air outlet, and increasing the wind force for dissipating heat from the drive motor, thereby improving the service life and noise reduction quality of the fan.

[0004] When the existing equipment is in use, although the noise of the fan itself can be significantly reduced, other noise sources, such as pipeline vibration or air flow noise, may affect the overall noise level. In particular, during the operation of the centrifugal fan, due to the forced change of the flow direction and flow rate of the gas medium, the air inlet and outlet of the centrifugal fan will generate a large noise, thus affecting the overall noise reduction effect. Therefore, a low-pressure fan with energy saving and noise reduction was developed. Summary of the invention

[0005] The object of the present invention is to provide a low-pressure fan with energy saving and noise reduction to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: an energy-saving and noise-reducing low-pressure fan, comprising a base, a driving member is arranged at the upper end of the base, a transmission member is arranged at the output end of the driving member, and a support block is arranged at one end of the transmission member away from the driving member, a driving cylinder is arranged at the end of the support block, and a protective component is rotatably installed on the inner wall of the driving cylinder, and the end of the transmission member is limited by the protective component;

[0007] A regulating component, which is mounted on one side of the driving cylinder and is used to control the gas flow rate;

[0008] The regulating assembly comprises a conical cylinder connected to the driving cylinder, a baffle is provided at one end of the conical cylinder away from the driving cylinder, a circular ring is rotatably mounted on the outer surface of the conical cylinder, and the inner wall of the circular ring penetrates and extends to the inner cavity of the conical cylinder;

[0009] The inner cavity of the conical cylinder is provided with a movable block, the outer surface of the movable block is connected to the inner wall of the circular ring, and the end of the movable block is provided with a plurality of groups of arc grooves, and the plurality of groups of arc grooves are evenly distributed at the end of the movable block;

[0010] A fixed plate is rotatably mounted on the lower end of the movable block, the outer surface of the fixed plate is fixedly connected to the inner wall of the conical cylinder, and a sliding groove corresponding to the arc groove is opened at the end of the fixed plate;

[0011] A sliding rod is slidably installed on the inner wall of the arc-shaped groove, and the lower end of the outer surface of the sliding rod is slidably connected to the inner wall of the sliding groove. A pushing block is provided at the lower end of the sliding rod, and an adjusting plate is rotatably installed on the lower end of the pushing block. A limiting block is rotatably installed on the lower end of the adjusting plate, and the outer surface of the limiting block is fixedly connected to the inner wall of the conical cylinder.

[0012] As a further optimization solution of the present invention, the cross-section of the limiting block is annular, and a protrusion corresponding to the adjustment plate is provided at the upper end of the limiting block, and each of the protrusions is rotatably connected to the end of the adjustment plate.

[0013] As a further optimization solution of the present invention, the protection component includes a base plate rotatably connected to the driving cylinder, a slot is formed at an end of the base plate, and a first elastic member is disposed on an inner wall of the slot.

[0014] As a further optimization solution of the present invention, a positioning rod is provided at the end of the bottom plate and located on one side of the slot hole, and a rotating cylinder is provided at the end of the positioning rod.

[0015] As a further optimization solution of the present invention, a plurality of through holes are provided on the outer surface of the rotating cylinder, and the plurality of through holes are evenly distributed on the outer surface of the rotating cylinder, and a sound absorbing block is provided in the inner cavity of the through hole.

[0016] As a further optimization solution of the present invention, the inner cavity of the rotating cylinder is provided with a connecting shaft, and the inner cavity of the rotating cylinder is evenly provided with multiple groups of second elastic members with the connecting shaft as the center.

[0017] As a further optimization solution of the present invention, a rotating disk is provided at the end of the second elastic member, and the end of the connecting shaft passes through and extends to the other end of the rotating disk.

[0018] As a further optimization solution of the present invention, a docking block is provided at the end of the connecting shaft, and a limiting cylinder is rotatably installed at the end of the turntable.

[0019] As a further optimization scheme of the present invention, the end of the docking block passes through and extends to the inner cavity of the limiting cylinder, and a positioning block is slidably installed on the inner wall of the limiting cylinder, and the lower end of the positioning block is connected to the upper end of the docking block.

[0020] As a further optimization scheme of the present invention, multiple groups of clamping blocks are evenly arranged on the upper end of the positioning block, and the ends of the multiple groups of clamping blocks are tapered as a whole after being combined, the inner wall of the limiting cylinder close to one end of the clamping block is inclined outward, and the inner walls of the multiple groups of clamping blocks are provided with fan blades.

[0021] Compared with the prior art, the energy-saving and noise-reducing low-pressure fan provided by the present invention has the following beneficial effects: when the circular ring rotates, the movable block is synchronously driven to rotate around the connection with the fixed plate, thereby cooperating with the arc groove to push the slide bar to move. Since the lower end of the outer surface of the slide bar is slidably connected with the inner wall of the slide groove, when the slide bar is forced to move, it expands outward or contracts toward the middle along the trajectory of the slide groove. The adjustment plate is limited by the push block and the limiting block, and the position of the push block is adjusted so that the part surrounded by the adjustment plate is in a forward cone or a reverse cone. By gradually increasing the cross-sectional area of ​​the airflow channel, the airflow velocity and pressure loss are reduced. By gradually reducing the cross-sectional area of ​​the airflow channel, the airflow is accelerated, thereby improving the efficiency of the fan and reducing noise.

[0022] A guide groove is provided at the end of the bottom plate, and the inner wall of the guide groove is slidably connected to the outer surface of the positioning rod, so that when the connecting shaft rotates, the entire connecting shaft is buffered and the noise caused by vibration is reduced. When the limit cylinder moves, its inner wall slowly separates from the outer surface of the clamping block, so that the gap between the multiple clamping blocks gradually increases, and the fan blade can be installed in the gap. The limit cylinder is pushed to the initial position through the action of the second elastic member, and the multiple clamping blocks are pushed toward the middle to fix the fan blade, so that the fan blade is always in a stable state as a whole during operation to avoid the generation of abnormal noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0024] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0025] Figure 2 A cross-sectional view of the overall internal structure provided by an embodiment of the present invention;

[0026] Figure 3 A schematic diagram of the structure of a protection component provided in an embodiment of the present invention;

[0027] Figure 4 A first cross-sectional view of the internal structure of the protection assembly provided by an embodiment of the present invention;

[0028] Figure 5 A second cross-sectional view of the internal structure of the protection component provided by an embodiment of the present invention;

[0029] Figure 6 A schematic diagram of the structure of a control component provided by an embodiment of the present invention;

[0030] Figure 7 A first cross-sectional view of the internal structure of the regulating component provided in an embodiment of the present invention;

[0031] Figure 8 A second cross-sectional view of the internal structure of the regulating component provided in an embodiment of the present invention;

[0032] Fig. 9 A third cross-sectional view of the internal structure of the regulating component provided in an embodiment of the present invention.

[0033] Description of reference numerals:

[0034] 1. Base; 2. Protection component; 3. Adjustment component; 11. Driving member; 12. Transmission member; 13. Support block; 14. Driving cylinder; 15. Fan blade; 21. Bottom plate; 211. Slot hole; 212. First elastic member; 213. Positioning rod; 22. Rotating cylinder; 221. Through hole; 23. Sound absorbing block; 24. Second elastic member; 25. Turntable; 26. Docking block; 27. Limiting cylinder; 28. Positioning block; 281. Clamping block; 29. ​​Connecting shaft; 31. Conical cylinder; 311. Baffle; 32. Ring; 33. Movable block; 331. Arc groove; 34. Slide rod; 341. Push block; 35. Fixed plate; 351. Slide groove; 36. Adjustment plate; 37. Limiting block. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Example: See Figure 1 - Fig. 9 A low-pressure fan with energy saving and noise reduction includes a base 1, a driving member 11 is arranged at the upper end of the base 1, a transmission member 12 is arranged at the output end of the driving member 11, and a support block 13 is arranged at the end of the transmission member 12 away from the driving member 11, a driving cylinder 14 is arranged at the end of the support block 13, and a protective component 2 is rotatably installed on the inner wall of the driving cylinder 14, and the end of the transmission member 12 is limited by the protective component 2.

[0038] In this solution, the driving member 11 is a device with power output such as a motor, and is connected to an external control device, wherein the transmission member 12 is a device with power transmission such as a belt. When the driving member 11 is started, the transmission member 12 drives the connecting shaft 29 to rotate.

[0039] The support block 13 is used to support the transmission member 12 so that the transmission member 12 remains stable as a whole during operation, and at the same time limits the driving cylinder 14 .

[0040] The control device can select a single-chip microcomputer as the control end. In this embodiment, the single-chip microcomputer is a typical embedded microcontroller (Micro controller unit), which is composed of an arithmetic unit, a controller, a memory, an input and output device, etc., which is equivalent to a microcomputer. Compared with the general-purpose microprocessor used in personal computers, it emphasizes self-supply (no external hardware) and cost saving. Its biggest advantage is that it is small in size and can be placed inside the instrument, but it has a small storage capacity, a simple input and output interface, and low functional consumption.

[0041] Furthermore, the regulating component 3 is mounted on one side of the driving cylinder 14 and is used to control the gas flow rate; wherein the regulating component 3 includes a conical cylinder 31 connected to the driving cylinder 14, a baffle 311 is provided at one end of the conical cylinder 31 away from the driving cylinder 14, a circular ring 32 is rotatably mounted on the outer surface of the conical cylinder 31, and the inner wall of the circular ring 32 penetrates and extends to the inner cavity of the conical cylinder 31.

[0042] In this embodiment, the smaller end of the conical tube 31 is in communication with the outer surface of the driving tube 14 , so that the airflow on the inner wall of the driving tube 14 is transmitted out through the conical tube 31 .

[0043] The end of the conical tube 31 is provided with a fixing component such as a clamp to fix the conical tube 31 so that it will not loosen during operation, and the inner wall of the end of the conical tube 31 is provided with a sealing component such as rubber to further seal the connection.

[0044] Furthermore, a movable block 33 is provided in the inner cavity of the conical cylinder 31 , the outer surface of the movable block 33 is connected to the inner wall of the ring 32 , and a plurality of arc grooves 331 are opened at the end of the movable block 33 , and the plurality of arc grooves 331 are evenly distributed at the end of the movable block 33 .

[0045] Specifically, when the ring 32 rotates, the movable block 33 disposed on the inner wall of the ring 32 can be driven to rotate synchronously. Since an arc groove 331 is provided at the end of the movable block 33 , the arc groove 331 can rotate synchronously with the movable block 33 .

[0046] A groove is provided in the middle of the movable block 33 , and components with gas transmission function such as a guide tube are provided on the inner wall of the groove, and the guide tube extends to the outside of the baffle 311 .

[0047] Furthermore, a fixing plate 35 is rotatably mounted on the lower end of the movable block 33 , and the outer surface of the fixing plate 35 is fixedly connected to the inner wall of the conical cylinder 31 . Meanwhile, a sliding groove 351 corresponding to the arc groove 331 is formed at the end of the fixing plate 35 .

[0048] Specifically, the fixing plate 35 is fixedly disposed on the inner wall of the conical tube 31 , thereby supporting the movable block 33 , so that the conical tube 31 is in a stable state when rotating, and the sliding rod 34 is limited by the sliding groove 351 .

[0049] Furthermore, a slide rod 34 is slidably installed on the inner wall of the arc groove 331, and at the same time, the lower end of the outer surface of the slide rod 34 is slidably connected to the inner wall of the slide groove 351, and a push block 341 is provided at the lower end of the slide rod 34, and an adjustment plate 36 is rotatably installed on the lower end of the push block 341, and a limiting block 37 is rotatably installed on the lower end of the adjustment plate 36, and the outer surface of the limiting block 37 is fixedly connected to the inner wall of the conical cylinder 31.

[0050] Specifically, when the circular ring 32 rotates, the movable block 33 is synchronously driven to rotate around the connection with the fixed plate 35, thereby cooperating with the arc groove 331 to push the slide rod 34 to move. Since the lower end of the outer surface of the slide rod 34 is slidingly connected to the inner wall of the slide groove 351, when the slide rod 34 is forced to move, it expands outward or contracts toward the middle along the trajectory of the slide groove 351.

[0051] When the slide rod 34 moves, the push block 341 drives the adjustment plate 36 to move, wherein a sealing component such as elastic rubber is arranged between two adjacent adjustment plates 36, so that no gap is generated between the two adjustment plates 36 when the angle of the adjustment plate 36 is adjusted.

[0052] The adjustment plate 36 is limited by the push block 341 and the limiting block 37, and then the position of the push block 341 is adjusted so that the portion surrounded by the adjustment plate 36 is in a forward cone or a reverse cone. By gradually increasing the cross-sectional area of ​​the airflow channel, the airflow velocity and pressure loss are reduced, and by gradually reducing the cross-sectional area of ​​the airflow channel, the airflow is accelerated, thereby improving the efficiency of the fan and reducing noise.

[0053] Furthermore, the cross section of the limiting block 37 is in a circular ring shape, and a protrusion corresponding to the adjustment plate 36 is provided at the upper end of the limiting block 37 , and each protrusion is rotatably connected to the end of the adjustment plate 36 .

[0054] Specifically, a component having a sealing effect, such as rubber, is disposed on the upper end of the limiting block 37 so that after the adjusting plate 36 rotates, the rotating end thereof remains in a sealed state.

[0055] Furthermore, the protection assembly 2 includes a bottom plate 21 rotatably connected to the driving cylinder 14, a slot hole 211 is provided at the end of the bottom plate 21, and a first elastic member 212 is provided on the inner wall of the slot hole 211. A positioning rod 213 is provided at the end of the bottom plate 21 and located on one side of the slot hole 211, and a rotating cylinder 22 is provided at the end of the positioning rod 213.

[0056] In this embodiment, the first elastic member 212 is an elastic component such as a spring, and one end of the first elastic member 212 is connected to the lower end of the rotating cylinder 22; a guide groove is provided at the end of the bottom plate 21, and the inner wall of the guide groove is slidably connected to the outer surface of the positioning rod 213, so that when the connecting shaft 29 rotates, the connecting shaft 29 is buffered as a whole, and the noise generated by vibration is reduced.

[0057] Further, the outer surface of the rotating cylinder 22 is provided with multiple groups of through holes 221, and the multiple groups of through holes 221 are evenly distributed on the outer surface of the rotating cylinder 22, and the inner cavity of the through holes 221 is provided with a sound absorbing block 23. The inner cavity of the rotating cylinder 22 is provided with a connecting shaft 29, and the inner cavity of the rotating cylinder 22 is evenly provided with multiple groups of second elastic members 24 with the connecting shaft 29 as the center. A rotating disk 25 is provided at the end of the second elastic member 24, and the end of the connecting shaft 29 passes through and extends to the other end of the rotating disk 25.

[0058] Specifically, the sound absorbing block 23 is a sound-absorbing material such as foam or mineral wool to reduce the reflection and propagation of noise. At the same time, the second elastic member 24 is an elastic member such as a spring to support the turntable 25 so that the turntable 25 is in a stable state as a whole.

[0059] Furthermore, a docking block 26 is provided at the end of the connecting shaft 29 , and a limiting cylinder 27 is rotatably mounted at the end of the rotating disk 25 .

[0060] Specifically, the outer surface of the docking block 26 is slidably connected to the inner wall of the limiting cylinder 27. When the fan blade 15 needs to be installed, the turntable 25 is squeezed by the limiting cylinder 27, so that the entire limiting cylinder 27 moves downward and squeezes the second elastic member 24, and cooperates with the second elastic member 24 to support the limiting cylinder 27.

[0061] Furthermore, the end of the docking block 26 passes through and extends to the inner cavity of the limiting cylinder 27 , and a positioning block 28 is slidably mounted on the inner wall of the limiting cylinder 27 , and the lower end of the positioning block 28 is connected to the upper end of the docking block 26 .

[0062] Specifically, when the limiting cylinder 27 moves downward, the positioning block 28 is always in a stable state because the positioning block 28 is connected to the docking block 26 .

[0063] Furthermore, multiple groups of snap-in blocks 281 are evenly arranged on the upper end of the positioning block 28, and the ends of the multiple groups of snap-in blocks 281 are overall conical after being combined, the inner wall of the limiting cylinder 27 close to one end of the snap-in block 281 is inclined outward, and the inner walls of the multiple groups of snap-in blocks 281 are provided with fan blades 15.

[0064] Specifically, when the limiting cylinder 27 moves, its inner wall is slowly separated from the outer surface of the snap-in block 281, so that the gap between the multiple snap-in blocks 281 gradually increases, and the fan blade 15 can be installed in the gap. The limiting cylinder 27 is pushed to the initial position through the action of the second elastic member 24, and then the multiple snap-in blocks 281 are pushed toward the middle to fix the fan blade 15. When the fan blade 15 is running, the whole is always in a stable state to avoid the generation of abnormal noise.

[0065] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A low-pressure fan with energy saving and noise reduction, characterized in that: The invention comprises a base (1), wherein a driving member (11) is arranged at the upper end of the base (1), a transmission member (12) is arranged at the output end of the driving member (11), and a support block (13) is arranged at one end of the transmission member (12) away from the driving member (11), a driving cylinder (14) is arranged at the end of the support block (13), and a protective component (2) is rotatably mounted on the inner wall of the driving cylinder (14), and the end of the transmission member (12) is limited by the protective component (2); A regulating component (3), which is mounted on one side of the driving cylinder (14) and is used to control the gas flow rate; The regulating assembly (3) comprises a conical cylinder (31) connected to the driving cylinder (14); a baffle (311) is provided at one end of the conical cylinder (31) away from the driving cylinder (14); a circular ring (32) is rotatably mounted on the outer surface of the conical cylinder (31); and an inner wall of the circular ring (32) penetrates and extends to the inner cavity of the conical cylinder (31); The inner cavity of the conical cylinder (31) is provided with a movable block (33), the outer surface of the movable block (33) is connected to the inner wall of the circular ring (32), and the end of the movable block (33) is provided with a plurality of groups of arc grooves (331), and the plurality of groups of arc grooves (331) are evenly distributed at the end of the movable block (33); A fixed plate (35) is rotatably mounted on the lower end of the movable block (33), the outer surface of the fixed plate (35) is fixedly connected to the inner wall of the conical cylinder (31), and a sliding groove (351) corresponding to the arc groove (331) is formed at the end of the fixed plate (35); A slide rod (34) is slidably mounted on the inner wall of the arc groove (331), and the lower end of the outer surface of the slide rod (34) is slidably connected to the inner wall of the slide groove (351). A push block (341) is provided at the lower end of the slide rod (34), and an adjustment plate (36) is rotatably mounted on the lower end of the push block (341). A limiting block (37) is rotatably mounted on the lower end of the adjustment plate (36), and the outer surface of the limiting block (37) is fixedly connected to the inner wall of the conical cylinder (31).

2. The energy-saving and noise-reducing low-pressure fan according to claim 1, characterized in that: The cross section of the limiting block (37) is in the shape of a circular ring, and a protrusion corresponding to the adjustment plate (36) is provided at the upper end of the limiting block (37), and each of the protrusions is rotatably connected to the end of the adjustment plate (36).

3. The energy-saving and noise-reducing low-pressure fan according to claim 1, characterized in that: The protection component (2) comprises a bottom plate (21) rotatably connected to the driving cylinder (14), a slot hole (211) is provided at the end of the bottom plate (21), and a first elastic member (212) is provided on the inner wall of the slot hole (211).

4. The energy-saving and noise-reducing low-pressure fan according to claim 3 is characterized in that: A positioning rod (213) is provided at the end of the bottom plate (21) and located on one side of the slot hole (211), and a rotating cylinder (22) is provided at the end of the positioning rod (213).

5. The energy-saving and noise-reducing low-pressure fan according to claim 4, characterized in that: The outer surface of the rotating cylinder (22) is provided with a plurality of groups of through holes (221), and the plurality of groups of through holes (221) are evenly distributed on the outer surface of the rotating cylinder (22), and a sound absorbing block (23) is provided in the inner cavity of the through hole (221).

6. The energy-saving and noise-reducing low-pressure fan according to claim 5, characterized in that: The inner cavity of the rotating cylinder (22) is provided with a connecting shaft (29), and the inner cavity of the rotating cylinder (22) is evenly provided with a plurality of groups of second elastic members (24) with the connecting shaft (29) as the center of the circle.

7. The energy-saving and noise-reducing low-pressure fan according to claim 6, characterized in that: A rotating disk (25) is disposed at the end of the second elastic member (24), and an end of the connecting shaft (29) passes through and extends to the other end of the rotating disk (25).

8. The energy-saving and noise-reducing low-pressure fan according to claim 7, characterized in that: The end of the connecting shaft (29) is provided with a docking block (26), and the end of the rotating disk (25) is rotatably mounted with a limiting cylinder (27).

9. The energy-saving and noise-reducing low-pressure fan according to claim 8, characterized in that: The end of the docking block (26) passes through and extends to the inner cavity of the limiting cylinder (27), and a positioning block (28) is slidably installed on the inner wall of the limiting cylinder (27), and the lower end of the positioning block (28) is connected to the upper end of the docking block (26).

10. The energy-saving and noise-reducing low-pressure fan according to claim 9, characterized in that: A plurality of groups of clamping blocks (281) are evenly arranged on the upper end of the positioning block (28), and the ends of the plurality of groups of clamping blocks (281) are overall tapered after being combined, the inner wall of the limiting cylinder (27) close to one end of the clamping block (281) is inclined outward, and the inner walls of the plurality of groups of clamping blocks (281) are provided with fan blades (15).

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