A high-pressure centrifugal fan with noise reduction structure

Abstract

The present invention relates to the technical field of centrifugal fans, and specifically to a high-pressure centrifugal fan with a noise reduction structure, comprising a centrifugal fan base, a motor fixedly installed above the centrifugal fan base, and a centrifugal fan casing fixedly installed in front of the centrifugal fan base, the beneficial effects are: by arranging a volute tongue fixing component inside the centrifugal fan casing, the extended streamlined volute tongue installed in the middle of the fixing ring is extended in a curve compared with the traditional volute tongue, the radius of the volute tongue is increased, the turbulence of the airflow in the centrifugal fan casing is reduced, and the contact position with the air outlet pipe adopts a streamlined design, the high-speed airflow is evenly and smoothly guided out through the air outlet pipe, the noise generated by the impact of the airflow is reduced, and an arc-shaped gap filling plate is arranged on the other side, which has a guiding effect and fills the gap between the centrifugal fan casing and the impeller bottom plate, has a sound insulation effect, blocks the sound propagation, effectively reduces the noise, and solves the problem of high noise at the air outlet of the high-pressure centrifugal fan in the prior art.

Description

Technical Field

[0001] The invention belongs to the technical field of centrifugal fans, and in particular relates to a high-pressure centrifugal fan with a noise reduction structure. Background Art

[0002] High-pressure centrifugal fans are widely used in the industrial field as air flow conveying equipment. They accelerate the gas through the rotating impeller and then discharge the gas through centrifugal force, thereby generating high pressure to overcome the resistance in the system and achieve efficient gas transportation. However, the air inlet of the high-pressure centrifugal fan currently used does not have a noise reduction function. When the wind enters the fan housing through the air inlet, it will generate a lot of noise.

[0003] The existing Chinese patent document with publication number CN213928891U proposes to solve the above problem by providing a silencer fixedly connected to the mounting block in the air inlet, opening a plurality of air inlet holes on the circumferential outer wall of the silencer, and providing a first silencer cotton fixedly connected to the silencer in the air inlet hole. However, there is still the problem that the noise at the air outlet of the high-pressure centrifugal fan is relatively loud and cannot be solved.

[0004] Therefore, the present invention proposes a high-pressure centrifugal fan with a noise reduction structure to solve the problem of high noise at the air outlet of the high-pressure centrifugal fan in the prior art. The volute tongue design of the optimized centrifugal fan is adopted, and rectifying rings and baffles are arranged at the inlet and outlet to reduce air flow vortex, optimize the air flow path, and reduce noise. Summary of the invention

[0005] In view of the deficiencies in the prior art, an object of the present invention is to provide a high-pressure centrifugal fan with a noise reduction structure to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a high-pressure centrifugal fan with a noise reduction structure, comprising a centrifugal fan base, a motor fixedly installed above the centrifugal fan base, a centrifugal fan housing fixedly installed in front of the centrifugal fan base, an air inlet pipe fixedly installed at the front end of the centrifugal fan housing, an air outlet pipe fixedly installed at the upper end of the centrifugal fan housing, an air inlet pipe noise reduction assembly is arranged inside the air inlet pipe, a volute tongue fixing assembly is arranged inside the centrifugal fan housing, an impeller base plate is arranged inside the volute tongue fixing assembly, the volute tongue fixing assembly comprises a fixing ring fixedly installed on the inner surface of the centrifugal fan housing, a main shaft is fixedly installed on the middle part of the impeller base plate, and the rear end of the main shaft passes through the side wall of the centrifugal fan housing and is fixedly connected to the output shaft of the motor.

[0007] Preferably, an extended streamlined volute tongue is fixedly mounted on one side of the middle portion of the fixing ring, and an upper end of the extended streamlined volute tongue is in contact with one side of the lower end of the air outlet pipe.

[0008] Preferably, arc-shaped gap filling plates are evenly distributed on the other side of the middle of the fixing ring, and a magnetic outer cover is fixedly installed on the inner side of the fixing ring.

[0009] Preferably, an annular iron block is fixedly installed at the front end of the main shaft, an impeller fixing ring is arranged in front of the impeller base plate, and a magnetic inner cover is fixedly installed on the outer side of the impeller base plate and the impeller fixing ring, and the magnetic inner cover is located on the inner side of the magnetic outer cover.

[0010] Preferably, triangular fixing plates are fixedly installed on the surface of one side of the impeller bottom plate opposite to the impeller fixing ring, and the triangular fixing plates are provided in multiple groups, and the multiple groups of triangular fixing plates are evenly distributed, and a triangular impeller plate is fixedly installed between two relatively groups of triangular fixing plates.

[0011] Preferably, inner fixing rings are provided on the inner sides of both ends of the triangular impeller blade, and two groups of the inner fixing rings are respectively fixedly mounted on the impeller bottom plate and the side surfaces of the impeller fixing ring, and shock-absorbing triangular rubber pads are clamped and installed on the outside of the two groups of the inner fixing rings, and the outer surfaces of the shock-absorbing triangular rubber pads are clamped with the inner surfaces of the triangular impeller blade.

[0012] Preferably, a built-in impeller is provided on one side of the impeller bottom plate close to the impeller fixing ring, and the middle part of the inner surface of the built-in impeller is fixedly connected to the outer surface of the main shaft.

[0013] Preferably, the air inlet duct noise reduction assembly includes an air inlet duct fixing flange, and the air inlet duct fixing flange is fixedly installed on the front end of the air inlet duct by bolts, a clip-on mounting ring 1 is fixedly installed on the side surface of the air inlet duct fixing flange, a clip-on mounting ring 2 is provided on one side of the clip-on mounting ring 1, outer side walls of the clip-on mounting ring 1 and the clip-on mounting ring 2 are both provided with clip grooves matching the air inlet duct, and a dust filter is fixedly installed on the side surface of the clip-on mounting ring 2.

[0014] Preferably, noise reduction baffles are evenly distributed between the snap-in mounting ring 1 and the snap-in mounting ring 2, the two ends of the noise reduction baffles are respectively fixedly connected to the side surfaces of the snap-in mounting ring 1 and the snap-in mounting ring 2, sound-absorbing grooves are opened on the surfaces of the noise reduction baffles, the interior of the noise reduction baffles is filled with sound-absorbing honeycomb panels, and a guide plate is installed on the inner side of the snap-in mounting ring 1, and the guide plate is distributed between the noise reduction baffles.

[0015] Preferably, the inner surface of the air outlet duct is evenly distributed with air outlet duct rectifying plates, and a corrugated noise reduction plate is arranged between the air outlet duct rectifying plates. The corrugated noise reduction plate and the air outlet duct rectifying plates are both fixedly mounted on the inner surface of the air outlet duct.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] By arranging a volute tongue fixing component inside the centrifugal fan casing, the extended streamlined volute tongue installed in the middle of the fixing ring is extended in a curve compared to the traditional volute tongue, thereby increasing the radius of the volute tongue and reducing the turbulence of the airflow in the centrifugal fan casing. The contact position with the air outlet pipe adopts a streamlined design, and the high-speed airflow is evenly and smoothly discharged through the air outlet pipe to reduce the noise generated by the impact of the airflow. An arc-shaped gap filling plate is arranged on the other side, which has a diversion effect and fills the gap between the centrifugal fan casing and the impeller bottom plate, has a sound insulation effect, blocks the sound propagation, and effectively reduces the noise. An air inlet pipe noise reduction component is installed inside the air inlet pipe, and the guide plate has a diversion function to reduce the air flow vortex. A noise reduction partition is arranged to absorb and silence the air inlet noise, thereby solving the problem of high noise at the air outlet of high-pressure centrifugal fans in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a front structural schematic diagram of the air inlet duct of the present invention in a state where no air is entering.

[0020] Figure 3 It is a front structural schematic diagram of the air inlet state of the air inlet pipe of the present invention.

[0021] Figure 4 This is a schematic diagram of the disassembled structure of the air inlet duct noise reduction assembly of the present invention.

[0022] Figure 5 It is a schematic diagram of the enlarged structure of point A of the present invention.

[0023] Figure 6 It is a schematic diagram of the separated and enlarged structure of the air inlet duct noise reduction component of the present invention.

[0024] Figure 7 It is a schematic diagram of the overall top view structure of the present invention.

[0025] Figure 8 It is a schematic diagram of the internal structure of the centrifugal fan housing of the present invention.

[0026] Fig. 9 It is a schematic diagram of the cross-sectional structure of the centrifugal fan casing of the present invention.

[0027] Fig.10 It is a schematic diagram of the front structure of the snail tongue fixing assembly of the present invention.

[0028] Fig.11 It is a schematic diagram of the back structure of the snail tongue fixing assembly of the present invention.

[0029] Fig.12 It is a schematic diagram of the disassembled structure of the volute tongue fixing assembly of the present invention.

[0030] Fig.13 It is a schematic diagram of the enlarged structure of point B of the present invention.

[0031] Fig.14 It is a schematic diagram of the split structure of the impeller base plate of the present invention.

[0032] Fig.15 It is a schematic diagram of the C-output enlarged structure of the present invention.

[0033] In the figure: 1. Centrifugal fan base; 11. Motor; 2. Centrifugal fan housing; 21. Air inlet pipe; 22. Air outlet pipe; 3. Air inlet pipe noise reduction assembly; 31. Air inlet pipe fixing flange; 32. Snap-on mounting ring 1; 321. Snap-on mounting ring 2; 33. Dust filter; 331. Magnetic ring; 332. Cleaning brush plate; 34. Guide plate; 35. Noise reduction baffle; 351. Sound absorbing groove; 352. Sound absorbing honeycomb plate; 4. Air outlet pipe rectifier plate; 41. Wave-shaped Noise reduction plate; 5. Snail tongue fixing assembly; 51. Fixing ring; 511. Magnetic outer cover; 52. Extended streamlined snail tongue; 53. Arc-shaped gap filling plate; 531. Sound wave reflection groove; 532. Sound-absorbing sponge rod; 6. Impeller bottom plate; 61. Main shaft; 611. Annular iron block; 62. Magnetic inner cover; 63. Impeller fixing ring; 64. Triangular fixing plate; 65. Triangular impeller blade; 66. Inner fixing ring; 661. Shock-absorbing triangular rubber pad; 67. Built-in impeller. DETAILED DESCRIPTION

[0034] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, not all of them, and are only used to explain the embodiments of the present invention, and are not used to limit 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.

[0035] Example 1, please refer to Figures 1 to 15The present invention provides a technical solution: comprising a centrifugal fan base 1, a motor 11 is fixedly installed on the top of the centrifugal fan base 1, a centrifugal fan housing 2 is fixedly installed in front of the centrifugal fan base 1, an air inlet pipe 21 is fixedly installed at the front end of the centrifugal fan housing 2, an air outlet pipe 22 is fixedly installed at the upper end of the centrifugal fan housing 2, an air inlet pipe noise reduction component 3 is arranged inside the air inlet pipe 21, a volute tongue fixing component 5 is arranged inside the centrifugal fan housing 2, an impeller bottom plate 6 is arranged inside the volute tongue fixing component 5, and an impeller bottom plate 6 is arranged inside the volute tongue fixing component 5 It includes a fixing ring 51 fixedly mounted on the inner surface of the centrifugal fan housing 2, a main shaft 61 is fixedly mounted in the middle of the impeller bottom plate 6, the rear end of the main shaft 61 penetrates the side wall of the centrifugal fan housing 2 and is fixedly connected to the output shaft of the motor 11, an extended streamlined volute tongue 52 is fixedly mounted on one side of the middle of the fixing ring 51, the upper end of the extended streamlined volute tongue 52 is in contact with one side of the lower end of the air outlet pipe 22, an arc-shaped gap filling plate 53 is evenly distributed on the other side of the middle of the fixing ring 51, and a magnetic outer cover 511 is fixedly mounted on the inner side of the fixing ring 51;

[0036] In this embodiment, the motor 11 is used to drive the main shaft 61 to rotate, the centrifugal fan casing 2 serves as the casing, the air inlet pipe 21 serves as the air flow inlet, and the air outlet pipe 22 serves as the air flow outlet. The extended streamlined volute tongue 52 installed in the middle of the fixing ring 51 is curved compared to the traditional volute tongue, increasing the radius of the volute tongue, reducing the turbulence of the air flow in the centrifugal fan casing 2, and adopts a streamlined design at the contact position with the air outlet pipe 22, evenly and smoothly directing the high-speed airflow through the air outlet pipe 22, reducing the noise generated by the impact of the air flow, and an arc-shaped gap filling plate 53 is arranged on the other side, which has a guiding effect while filling the gap between the centrifugal fan casing 2 and the impeller base plate 6, having a sound insulation effect, blocking the propagation of sound, and effectively reducing noise, thereby solving the problem of high noise at the air outlet of the high-pressure centrifugal fan in the prior art.

[0037] Example 2, please refer to Figures 1 to 15 On the basis of the first embodiment, in order to make the sound insulation effect of the arc gap filling plate 53 better, the present embodiment further proposes that a sound wave reflection groove 531 is opened on the surface of the arc gap filling plate 53, and sound absorbing sponge bars 532 are fixedly installed at intervals on the surface of the arc gap filling plate 53;

[0038] In this embodiment, the arc structure of the arc gap filling plate 53 can cause sound waves to be refracted and reflected in multiple directions when contacting its surface. A sound wave reflection groove 531 is provided on its surface. Compared with a planar structure, it can more effectively disperse the sound wave energy and reduce direct noise, thereby reducing the noise level. Combined with the loose and porous material of the sound-absorbing sponge rod 532, it can absorb the sound wave energy generated when the airflow passes through, reduce the noise level, and further solve the problem of high noise at the air outlet of the high-pressure centrifugal fan in the prior art.

[0039] Example 3, please refer to Figures 1 to 15 On the basis of the second embodiment, in order to reduce the vibration noise generated by the overall rotation of the fan impeller, the present embodiment further proposes that a ring-shaped iron block 611 is fixedly installed at the front end of the main shaft 61, an impeller fixing ring 63 is arranged in front of the impeller bottom plate 6, and a magnetic inner cover 62 is fixedly installed on the outer side of the impeller bottom plate 6 and the impeller fixing ring 63, and the magnetic inner cover 62 is located on the inner side of the magnetic outer cover 511, and a triangular fixing piece 64 is fixedly installed on the surface of the side opposite to the impeller bottom plate 6 and the impeller fixing ring 63, and a plurality of groups of triangular fixing pieces 64 are arranged, and the plurality of groups of triangular fixing pieces 64 are evenly distributed relative to the two groups. A triangular impeller piece 65 is fixedly installed between the triangular fixing pieces 64, and inner fixing rings 66 are provided on the inner sides of both ends of the triangular impeller piece 65. Two groups of inner fixing rings 66 are respectively fixedly installed on the side surfaces of the impeller bottom plate 6 and the impeller fixing ring 63. Shock-absorbing triangular rubber pads 661 are clamped and installed on the outside of the two groups of inner fixing rings 66. The outer surface of the shock-absorbing triangular rubber pad 661 is clamped with the inner surface of the triangular impeller piece 65. A built-in impeller 67 is provided on one side of the impeller bottom plate 6 close to the impeller fixing ring 63. The middle part of the inner surface of the built-in impeller 67 is fixedly connected to the outer surface of the main shaft 61.

[0040] In this embodiment, the impeller base plate 6 and the impeller fixing ring 63 form an impeller frame, and the triangular fixing plate 64 is used to fix and weld the triangular impeller blade 65. The triangular impeller blade 65 is designed as a triangular blade, which can provide sufficient strength. At the same time, due to its thin plate design, it is lighter than a solid structure, which helps to improve the efficiency of the impeller, and the triangular impeller blade 65 is more durable when subjected to high-speed rotation and airflow impact, reducing wear and maintenance requirements. The inner fixing ring 66 is on the inner side of the triangular fixing plate 64, which not only plays the role of inner support for the triangular impeller blade 65, but also the shock-absorbing triangular rubber pad 661 can reduce the vibration of the triangular impeller blade 65 and play a role in noise reduction. The built-in impeller 67 is fixed on the outer surface of the main shaft 61, and rotates at high speed with the main shaft 61 to accelerate the gas, and due to the centrifugal force, The accelerated gas is pushed to the outer edge of the impeller base plate 6, and then gradually decelerated by being squeezed by the centrifugal fan casing 2 and the extended streamlined volute tongue 52, converting kinetic energy into pressure energy, and the pressurized gas is finally discharged through the air outlet pipe 22. The blades of the built-in impeller 67 adopt a bent structure, which can more effectively convert kinetic energy into pressure energy when conveying the airflow, and such a design helps to reduce the turbulence generated when the airflow passes through the impeller and reduce noise. The magnetic inner cover 62 surrounds the outer side of the impeller base plate 6 and the impeller fixing ring 63. The extended streamlined volute tongue 52 and the magnetic inner cover 62 are mutually exclusive magnetic materials. The principle of magnetic levitation can be used to avoid the impeller base plate 6 and the impeller fixing ring 63 from contacting objects when rotating to cause vibration and noise, further solving the problem of high noise at the air outlet of the high-pressure centrifugal fan in the prior art.

[0041] Example 4, please refer to Figures 1 to 15On the basis of the third embodiment, in order to reduce the noise at the air inlet pipe 21, the present embodiment further proposes that the air inlet pipe noise reduction assembly 3 includes an air inlet pipe fixing flange 31, the air inlet pipe fixing flange 31 is fixedly installed at the front end of the air inlet pipe 21 by bolts, a clamping mounting ring 1 32 is fixedly installed on the side surface of the air inlet pipe fixing flange 31, a clamping mounting ring 2 321 is provided on one side of the clamping mounting ring 1 32, and the outer side walls of the clamping mounting ring 1 32 and the clamping mounting ring 2 321 are both provided with a clamping groove adapted to the air inlet pipe 21, and the clamping mounting ring 1 32 is fixedly installed on the side surface of the air inlet pipe fixing flange 31. A dust filter 33 is fixedly installed on the side surface of the second mounting ring 321, and noise reduction baffles 35 are evenly distributed between the first mounting ring 32 and the second mounting ring 321. The two ends of the noise reduction baffles 35 are respectively fixedly connected to the side surfaces of the first mounting ring 32 and the second mounting ring 321. A sound-absorbing groove 351 is opened on the surface of the noise reduction baffle 35. The interior of the noise reduction baffle 35 is filled with a sound-absorbing honeycomb panel 352. A guide plate 34 is installed on the inner side of the first mounting ring 32, and the guide plates 34 are distributed between the noise reduction baffles 35.

[0042] In this embodiment, the air inlet duct fixing flange 31 plays a role of fixing and installing, the snap-fitting mounting ring 1 32 and the snap-fitting mounting ring 2 321 are fixed as a whole by the noise reduction baffle 35, and are snap-fitted with the inner wall of the air inlet duct 21 when inserted, and the installation and disassembly are very convenient. The guide plate 34 is squeezed inward when the air enters to produce an arc-shaped surface to play a role of guiding the air and avoid air flow turbulence. The noise reduction baffle 35 separates the guide plate 34, and the sound absorption groove 351 and the sound absorption honeycomb panel 352 can absorb noise and play a role of noise reduction. The dust filter 33 has the function of filtering dust on the incoming airflow to avoid the entry of dust, which further solves the problem of high noise at the air outlet of the high-pressure centrifugal fan in the prior art.

[0043] Example 5, please refer to Figures 1 to 15 On the basis of the fourth embodiment, in order to ensure the ventilation efficiency of the dust filter 33, the present embodiment further proposes that a magnetic ring 331 adapted to the annular iron block 611 is rotatably mounted in the middle of the dust filter 33, and a cleaning brush plate 332 is fixedly mounted on the outer surface of the magnetic ring 331, and the surface of the cleaning brush plate 332 contacts the surface of the dust filter 33;

[0044] In this embodiment, when the snap-fit ​​mounting ring 1 32 and the snap-fit ​​mounting ring 2 321 are snap-fitted to the air inlet duct 21, the magnetic ring 331 is sleeved on the outside of the annular iron block 611. The magnetic ring 331 utilizes the principle of magnetic adsorption. When the annular iron block 611 rotates, the cleaning brush plate 332 will scrape the surface of the dust filter 33 to ensure the ventilation efficiency of the dust filter 33.

[0045] Example 6: Please refer to Figures 1 to 15On the basis of the fifth embodiment, in order to reduce the noise of the air outlet duct 22, the present embodiment further proposes that the inner surface of the air outlet duct 22 is evenly distributed with air outlet duct rectifying plates 4, and a wave-shaped noise reduction plate 41 is arranged between the air outlet duct rectifying plates 4, and the wave-shaped noise reduction plate 41 and the air outlet duct rectifying plates 4 are both fixedly mounted on the inner surface of the air outlet duct 22;

[0046] In this embodiment, the air outlet duct straightening plate 4 is a streamlined vertical partition plate that guides the airflow inside the air outlet duct 22, optimizes the airflow distribution, improves the ventilation efficiency, and guides the airflow to be discharged more smoothly and evenly through the air outlet duct 22, avoiding the airflow from generating vortices or excessive local velocity in the pipeline, helping to maintain a stable airflow velocity and pressure, and avoiding irregular airflow impact and friction to generate noise. The wavy noise reduction plate 41 separates the airflow from colliding with the inner wall of the air outlet duct 22. It is a loose porous material with a sound-absorbing effect. The wavy structure increases the surface area of ​​the material, provides more sound wave reflection and absorption interfaces, helps to scatter sound waves, and reduce direct reflection of sound, thereby more effectively absorbing noise of various frequencies, improving the overall sound absorption performance, and further solving the problem of high noise at the air outlet of high-pressure centrifugal fans in the prior art.

[0047] Example 7, please refer to Figures 1 to 15 Based on the fifth embodiment, this embodiment further proposes a method for using a high-pressure centrifugal fan with a noise reduction structure, comprising the following steps:

[0048] Step 1: Install the air inlet pipe noise reduction assembly 3, insert the air inlet pipe noise reduction assembly 3 as a whole into the air inlet pipe 21 and clamp it with its inner wall, and use bolts to fix the air inlet pipe fixing flange 31 and the air inlet pipe 21;

[0049] Step 2: The fan works, the motor 11 is started to drive the main shaft 61 to rotate at a high speed, so that the built-in impeller 67 accelerates the gas, and due to the centrifugal force, the accelerated gas is pushed to the outer edge of the impeller bottom plate 6, and then gradually decelerated by the centrifugal fan housing 2 and the extended streamlined volute tongue 52, and the kinetic energy is converted into pressure energy, and the external air is sucked in through the air inlet pipe 21, and the pressurized gas is finally discharged through the air outlet pipe 22;

[0050] Step three, exhaust, extend the streamlined volute tongue 52 to evenly and smoothly guide the high-speed airflow through the air outlet pipe 22, reduce the noise generated by the impact of the airflow, and the air outlet pipe straightening plate 4 optimizes the airflow distribution and guides the airflow to be discharged more smoothly and evenly through the air outlet pipe 22.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-pressure centrifugal fan with a noise reduction structure, comprising a centrifugal fan base (1), a motor (11) fixedly mounted above the centrifugal fan base (1), a centrifugal fan housing (2) fixedly mounted in front of the centrifugal fan base (1), an air inlet pipe (21) fixedly mounted at the front end of the centrifugal fan housing (2), and an air outlet pipe (22) fixedly mounted at the upper end of the centrifugal fan housing (2), characterized in that: An air inlet duct noise reduction component (3) is arranged inside the air inlet duct (21), a volute tongue fixing component (5) is arranged inside the centrifugal fan housing (2), an impeller base plate (6) is arranged inside the volute tongue fixing component (5), the volute tongue fixing component (5) comprises a fixing ring (51) fixedly mounted on the inner surface of the centrifugal fan housing (2), a main shaft (61) is fixedly mounted in the middle of the impeller base plate (6), a rear end of the main shaft (61) passes through the side wall of the centrifugal fan housing (2) and is fixedly connected to the output shaft of the motor (11), an annular iron block (611) is fixedly mounted on the front end of the main shaft (61), an impeller fixing ring (63) is arranged in front of the impeller base plate (6), and triangular fixing plates (64) are respectively fixedly mounted on the side surface of the impeller base plate (6) opposite to the impeller fixing ring (63), and a plurality of groups of triangular fixing plates (64) are provided, and the plurality of groups of triangular fixing plates (64) are evenly distributed, a triangular impeller piece (65) is fixedly installed between the two groups of triangular fixing pieces (64), the inner sides of both ends of the triangular impeller piece (65) are provided with inner fixing rings (66), the two groups of inner fixing rings (66) are respectively fixedly installed on the side surfaces of the impeller bottom plate (6) and the impeller fixing ring (63), and the outer sides of the two groups of inner fixing rings (66) are clamped with shock-absorbing triangular rubber pads (661), and the outer surfaces of the shock-absorbing triangular rubber pads (661) are clamped with the inner surfaces of the triangular impeller piece (65), an extended streamlined volute tongue (52) is fixedly installed on one side of the middle part of the fixing ring (51), and the upper end of the extended streamlined volute tongue (52) is in contact with one side of the lower end of the air outlet pipe (22), arc-shaped gap filling plates (53) are evenly distributed on the other side of the middle part of the fixing ring (51), and a magnetic outer cover (511) is fixedly installed on the inner side of the fixing ring (51).

2. The high-pressure centrifugal fan with a noise reduction structure according to claim 1, characterized in that: A magnetic inner cover (62) is fixedly mounted on the outer sides of the impeller bottom plate (6) and the impeller fixing ring (63), and the magnetic inner cover (62) is located on the inner side of the magnetic outer cover (511).

3. The high-pressure centrifugal fan with a noise reduction structure according to claim 1, characterized in that: A built-in impeller (67) is provided on one side of the impeller bottom plate (6) close to the impeller fixing ring (63), and the middle portion of the inner surface of the built-in impeller (67) is fixedly connected to the outer surface of the main body shaft (61).

4. The high-pressure centrifugal fan with a noise reduction structure according to claim 1, characterized in that: The air inlet duct noise reduction assembly (3) comprises an air inlet duct fixing flange (31), the air inlet duct fixing flange (31) being fixedly mounted on the front end of the air inlet duct (21) by means of bolts, a first clamping mounting ring (32) being fixedly mounted on the side surface of the air inlet duct fixing flange (31), a second clamping mounting ring (321) being arranged on one side of the first clamping mounting ring (32), a clamping groove matching the air inlet duct (21) being arranged on the outer side walls of the first clamping mounting ring (32) and the second clamping mounting ring (321), and a dust filter (33) being fixedly mounted on the side surface of the second clamping mounting ring (321).

5. The high-pressure centrifugal fan with a noise reduction structure according to claim 4, characterized in that: Noise reduction baffles (35) are evenly distributed between the first clamping mounting ring (32) and the second clamping mounting ring (321); two ends of the noise reduction baffles (35) are respectively fixedly connected to the side surfaces of the first clamping mounting ring (32) and the second clamping mounting ring (321); a sound absorbing groove (351) is provided on the surface of the noise reduction baffles (35); the interior of the noise reduction baffles (35) is filled with a sound absorbing honeycomb panel (352); a guide plate (34) is installed on the inner side of the first clamping mounting ring (32); and the guide plate (34) is distributed between the noise reduction baffles (35).

6. The high-pressure centrifugal fan with a noise reduction structure according to claim 1, characterized in that: The inner surface of the air outlet duct (22) is evenly distributed with air outlet duct rectifying plates (4), and wave-shaped noise reduction plates (41) are arranged between the air outlet duct rectifying plates (4), and the wave-shaped noise reduction plates (41) and the air outlet duct rectifying plates (4) are both fixedly mounted on the inner surface of the air outlet duct (22).

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