Multilayered covered axial flow fan

Abstract

The utility model discloses a multilayer cladding formula's sound attenuation and noise reduction axial flow fan. Including box and the rack in box, fan assembly, flexible suspension module, flexible cladding module, the rack horizontal fixed in the top in the box, the top of fan assembly is through flexible suspension module flexible suspension on the rack, and both ends of fan assembly are through respective flexible cladding module flexible cladding and flexible support and are installed in the box, and flexible suspension module, flexible cladding module all have flexible buffer part, and the inside wall of box and the outer wall of air duct all stick and cover have sound insulation cotton. The utility model discloses through multilayer cladding structure barrier to the air noise that spreads outward, and utilize sponge ring and the soft connection design of flexible suspension module, effectively weaken vibration sound transmission and eliminate low frequency resonance, and simultaneously through flexible suspension module realizes the quick locking of air duct and unlocking and disassembly, and the later maintenance and overhaul operation of fan are facilitated.

Description

Technical Field

[0001] This utility model belongs to the field of fans, specifically a multi-layer encapsulated silencing and noise-reducing axial flow fan. Background Technology

[0002] Axial flow fans are widely used in industrial plants, HVAC systems, computer room ventilation, equipment cooling, and many other fields due to their simple structure, large ventilation volume, and low energy consumption. However, axial flow fans continuously generate aerodynamic and mechanical vibration noise during high-speed operation, including high-frequency airborne noise and low-frequency resonance noise. Long-term operation can not only cause excessive noise in the work area and deteriorate the working environment, but also easily cause resonance in surrounding equipment, affecting its service life. Furthermore, it does not meet the requirements of modern industrial green noise reduction and safe production standards.

[0003] Currently, noise reduction retrofitting methods for existing axial flow fans are relatively simple, mostly employing conventional means such as optimizing blade structure, adding simple silencers, and attaching a single layer of sound-absorbing material. These methods can only reduce surface aerodynamic noise to a limited extent, exhibiting significant technical limitations. First, traditional noise reduction structures lack overall sealed sound insulation, allowing the fan's overall noise to diffuse significantly through gaps in the casing and exposed frames, resulting in poor airborne noise blocking and low overall noise reduction efficiency. Second, existing noise reduction solutions often ignore the vibration noise generated during fan operation. Since fan frames are mostly rigid, high-frequency vibrations and low-frequency impact vibrations generated during fan operation are transmitted to the frame and surrounding walls and frame through rigid connections, creating solid-borne sound and secondary resonance noise, making it difficult to completely eliminate low-frequency booming noise. Third, conventional single-layer sound-absorbing noise reduction structures cannot eliminate reverberation noise generated by turbulent airflow inside the fan. Repeated reflections and superpositions of internal sound waves further exacerbate overall noise, resulting in poor noise reduction uniformity and stability.

[0004] Furthermore, traditional fan soundproof enclosures are mostly made of heavy, one-piece molded sheet metal, which is inconvenient to disassemble and maintain, has poor sealing performance, and lacks damping and vibration reduction functions. They cannot simultaneously address the dual problems of airborne and solid-vibration sound transmission, making it difficult to meet the demands of lightweight design, convenient installation, and efficient noise reduction. In summary, existing axial fan noise reduction technologies suffer from drawbacks such as limited noise reduction dimensions, weak low-frequency resonance suppression, susceptibility to secondary noise generation, and poor overall noise reduction effect. Utility Model Content

[0005] In order to address the problems of existing axial flow fan noise reduction technologies in the background art, such as single noise reduction dimension, weak low-frequency resonance suppression capability, easy generation of secondary noise, and poor overall noise reduction effect, this utility model discloses a multi-layer encapsulated silencing and noise-reducing axial flow fan.

[0006] The technical solution adopted in this utility model is: Including the enclosure, the inner walls are lined with sound-absorbing cotton; And located inside the box: The frame is horizontally fixed to the top of the enclosure; The fan assembly is housed inside the casing, suspended from the top on the frame, and its outer perimeter is covered with sound insulation cotton. Flexible suspension modules are connected between the top of the wind turbine assembly and the frame; The flexible covering component is flexibly covering both ends of the wind turbine assembly and flexibly supported between each end of the wind turbine assembly and the housing.

[0007] The fan assembly includes a duct and a fan. The fan is fixedly installed inside the duct. Openings are provided on both sides of the bottom of the housing. Both ends of the duct are respectively connected to the openings on both sides of the bottom of the housing through a flexible covering component.

[0008] The flexible covering component includes a connecting cylinder and a sponge ring. The connecting cylinder is coaxially fixedly fitted inside the opening. The ends of the air duct extend into the connecting cylinder respectively. A sponge ring is sandwiched between the outer wall of the air duct end and the inner wall of the connecting cylinder.

[0009] The flexible suspension module includes two suspension components and a special-shaped bolt. The upper and lower ends of the two suspension components are connected between the frame and the fan assembly. The upper end of the special-shaped bolt passes through a threaded hole in the frame via a threaded connection. The two suspension components are symmetrically arranged on both sides of the special-shaped bolt and are connected to the lower end of the special-shaped bolt.

[0010] Each suspension assembly includes a positioning cylinder, a suspension rod, a rubber sleeve, a stop plate, and a telescopic rod. A through-hole is provided on the frame, and a suspension rod is flexibly inserted into the through-hole via a rubber sleeve. The upper end of the suspension rod extends out of the through-hole and is coaxially fixedly connected to a stop plate. The lower end of the suspension rod is elastically connected to the upper end of the positioning cylinder via a telescopic rod and a spring-loaded pin. The lower end of the positioning cylinder is fixed to the top surface of the fan assembly. Furthermore, the telescopic rods of the two suspension assemblies are located on both sides of the irregular bolt and are connected to the lower end of the irregular bolt.

[0011] The diameter of the blocking disc is larger than the diameter of the socket.

[0012] The lower end of the irregular bolt is set as a cone; an annular groove is opened on the outer periphery of the lower end of the rod, one end of the telescopic rod moves through the side wall of the positioning cylinder and is embedded in the annular groove, the middle part of the telescopic rod is fixedly connected to the outer side wall of the positioning cylinder by a spring, and the other end of the telescopic rod is in contact with the conical surface of the irregular bolt as a contact end, and the contact end is hemispherical and covered with rubber material.

[0013] The telescopic rod has an outer flange in the middle, and a spring is fitted on the telescopic rod between the outer flange and the outer wall of the positioning cylinder. The two ends of the spring are fixedly connected to the outer flange and the outer wall of the positioning cylinder, respectively.

[0014] The rubber sleeve is shaped like an inverted convex character and has a central through hole axially opened inside for the rod to pass through. The lower part of the rubber sleeve is embedded between the inner wall of the insertion hole and the outer periphery of the rod, and the upper part of the rubber sleeve extends horizontally and is sandwiched between the lower end face of the blocking plate and the upper surface of the frame.

[0015] The enclosure is made of polyurethane hand-stitched panels, which are composed of a metal panel and a rigid closed-cell PU core material.

[0016] The beneficial effects of this utility model are: This utility model is a multi-layered sound-absorbing and noise-reducing axial flow fan. The triple noise reduction structure works synergistically. First, the outer sound insulation enclosure: the whole machine and the air duct are covered with polyurethane handmade board splicing box to block the transmission of noise through the air. Second, the inner sound absorption buffer: the inner wall of the box and the outer wall of the air duct are fully covered with sound insulation cotton to absorb internal reverberation noise and attenuate sound waves. Third, the suspension vibration isolation and damping: the whole fan and air duct are suspended inside the box through a flexible suspension module. The suspension rod and the frame insertion hole are connected with rubber sleeves to achieve a fully flexible connection, cut off the rigid sound bridge, and rely on elastic vibration isolation and damping dissipation to suppress low-frequency vibration resonance and avoid vibration transmission to the outer box to generate secondary noise. Attached Figure Description

[0017] Figure 1 This is a front view of the entire device; Figure 2 This is a rear view of the entire device; Figure 3 This is a schematic diagram of the internal structure of the device; Figure 4 This is a partial sectional view of the device; Figure 5 for Figure 4 A schematic diagram of the partial structure at point A; Figure 6 This is a schematic diagram of the flexible suspension module structure.

[0018] The attached diagrams are labeled as follows: 1. Box body; 2. Air duct; 3. Fan; 4. Connecting cylinder; 5. Sponge ring; 6. Frame; 7. Positioning cylinder; 8. Hanging rod; 9. Insertion hole; 10. Rubber sleeve; 11. Blocking plate; 12. Annular groove; 13. Telescopic rod; 14. Cone; 15. Irregular bolt. Detailed Implementation

[0019] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0020] like Figure 3 As shown, the device of this utility model includes a housing 1, a frame 6 inside the housing 1, a fan assembly, a flexible suspension module, and a flexible covering assembly.

[0021] The frame 6 is horizontally fixed to the top of the housing 1 by welding. The top of the fan duct 2 of the fan assembly is flexibly suspended on the frame 6 by a flexible suspension module. Both ends of the fan assembly are flexibly covered and flexibly supported in the housing 1 by their respective flexible covering components. The housing 1 can isolate most of the noise generated when the fan 3 is running. The flexible suspension module and the flexible covering component are equipped with flexible buffer parts. The inner wall of the housing 1 and the outer wall of the fan duct 2 are covered with sound insulation cotton to further reduce noise transmission. In addition, the frame 6 and the flexible suspension module further reduce the noise generated when the fan 3 vibrates during operation.

[0022] like Figure 1 and Figure 2 As shown, the fan assembly includes a duct 2 and a fan 3. The fan 3 is installed inside the duct 2. The fan 3 is fixed to the inner wall of the duct 2 by bolts through a bracket inside the duct 2. Openings are provided on both sides of the bottom of the housing 1. The two ends of the duct 2 are respectively connected to the circular openings on both sides of the bottom of the housing 1 through a flexible covering component.

[0023] The flexible covering assembly includes a connecting cylinder 4 and sponge rings 5. The connecting cylinder 4 is coaxially fixedly fitted inside the opening, and the connecting cylinder 4 is riveted to the opening of the housing 1. The ends of the air duct 2 extend into the connecting cylinder 4, and the sponge rings 5 ​​are sandwiched between the inner wall of the connecting cylinder 4 and the outer wall of the end of the air duct 2. The two sponge rings 5 ​​can separate the outer wall of the air duct 2 from the two connecting cylinders 4, thereby reducing vibration transmission.

[0024] On the one hand, the entire fan 3 and the air duct 2 are enclosed by the box 1, which can isolate most of the noise generated when the fan 3 is running. On the other hand, the inner wall of the box 1 and the outer wall of the air duct 2 are covered with sound insulation cotton to further reduce noise transmission. In addition, the frame 6 and the flexible suspension module are used to further reduce the noise generated when the fan 3 vibrates during operation.

[0025] The enclosure 1 is made of polyurethane hand-stitched panels. The polyurethane hand-stitched panels are composed of a metal panel and a rigid closed-cell PU core material, which can achieve two major functions: sound insulation (blocking sound from penetrating the wall) and damping vibration reduction (reducing the transmission of vibration).

[0026] like Figure 4 and Figure 5 As shown, the flexible suspension module includes two suspension components and a special-shaped bolt 15. The upper and lower ends of the two suspension components are connected between the frame 6 and the top surface of the wind duct 2 of the fan assembly.

[0027] Each suspension assembly includes a positioning cylinder 7, a suspension rod 8, a rubber sleeve 10, a baffle plate 11, and a telescopic rod 13. Two insertion holes 9 are formed through the frame 6, corresponding to the air duct 2. A suspension rod 8 is flexibly inserted into each insertion hole 9 via the rubber sleeve 10. The upper end of the suspension rod 8 extends out of the insertion hole 9 of the frame 6 and is coaxially and fixedly connected to a baffle plate 11. The diameter of the baffle plate 11 is larger than the diameter of the insertion hole 9 to prevent the suspension rod 8 from dislodging downwards from the insertion hole 9. The lower end of the suspension rod 8 is elastically connected to the positioning cylinder 7 via the telescopic rod 13 and a spring-loaded pin. The lower end of the positioning cylinder 7 is fixed to the top surface of the air duct 2 of the fan assembly. When the flexible suspension module is in use, the suspension rod 8 is inserted into the socket 9, and the socket 9 is embedded with a rubber sleeve 10, so that the suspension rod 8 and the frame 6 are in a soft connection state. In this way, the vibration generated by the fan 3 can be transmitted to the housing 1 less, cutting off the rigid vibration transmission, using elastic vibration isolation and damping dissipation to weaken the vibration transmission and eliminate low frequency resonance, and in conjunction with the enclosure panel to block the outward air noise.

[0028] The rubber sleeve 10 is shaped like an inverted convex character and has a central through hole for the rod 8 to pass through. The lower part of the rubber sleeve 10 is embedded between the inner wall of the insertion hole 9 and the outer periphery of the rod 8, and the upper part of the rubber sleeve 10 extends horizontally and is sandwiched between the lower end face of the blocking plate 11 and the upper surface of the frame 6, so that the rod 8 and the frame 6 are in a flexible suspension state with a soft connection.

[0029] like Figure 6 As shown, the upper end of the irregular bolt 15 passes through a threaded hole in the frame 6 via a threaded connection. Two suspension components are symmetrically arranged on both sides of the irregular bolt 15 and are connected to the lower end of the irregular bolt 15. A cone 14 with a larger upper end and a smaller lower end is coaxially fixed to the bottom end of the irregular bolt 15. A telescopic rod 13 is arranged on both sides of the cone 14. The telescopic rods 13 of the two suspension components are located on both sides of the irregular bolt 15 and are connected to the lower end of the irregular bolt 15.

[0030] The shaped bolt 15 and the cone 14 adopt a split, detachable connection structure. Specifically, the lower end of the shaped bolt 15 has a connecting bolt end, and the center of the top of the cone 14 has a threaded hole that mates with the lower end of the shaped bolt 15. During assembly, the shaped bolt 15 is first threaded through the threaded hole on the frame 6 from top to bottom. After the lower end of the shaped bolt 15 extends out of the bottom surface of the frame 6, the cone 14 is then threaded from bottom to top and coaxially fixed to the lower end of the shaped bolt 15, thereby achieving a rotatable and liftable installation of the shaped bolt 15 and the cone 14 on the frame 6.

[0031] An annular groove 12 is provided on the outer periphery of the lower end of the boom 8. One end of the telescopic rod 13 is movably inserted through the side wall of the positioning cylinder 7 and then embedded in the annular groove 12. The middle part of the telescopic rod 13 is fixedly connected to the outer side wall of the positioning cylinder 7 via a spring. Each positioning cylinder 7 has a through hole corresponding to the telescopic rod 13. The annular groove 12 is set to correspond to the through hole so that the telescopic rod 13 can be inserted into the annular groove 12 through the through hole.

[0032] Installation and Locking: When it is necessary to install and lock the air duct 2, after inserting the two hangers 8 into the positioning cylinder 7, rotate the special bolt 15. The special bolt 15 will drive the cone 14 to rotate and descend at the same time. This will allow the inclined surfaces on both sides of the cone 14 to press outward against the hemispherical rubber ends of the telescopic rods 13 on both sides. This will allow the telescopic rods 13 to overcome the elastic force of the return spring and be inserted into the annular groove 12 on the corresponding hanger 8 through the through hole. This will limit the hanger 8 in the positioning cylinder 7 and complete the suspension installation of the fan assembly.

[0033] Unlocking and disassembly: When it is necessary to disassemble the air duct 2, simply rotate the irregular bolt 15 in the opposite direction to move the cone 14 upward, reducing the pressure on the two telescopic rods 13. Under the elastic force of their own return springs, the two telescopic rods 13 disengage from the annular groove 12, at which point the air duct 2 can be easily removed.

[0034] The above operations enable quick locking, unlocking, and disassembly of the duct 2, which is more conducive to the later maintenance and repair of the fan 3. The contact ends of the two telescopic rods 13 and the cone 14 are hemispherical and covered with rubber material. The hemispherical contact ends covered with rubber material can reduce the contact area between the telescopic rods 13 and the cone 14, and the covered rubber material can also greatly reduce the vibration transmission between the two.

[0035] The telescopic rod 13 has an outer flange in the middle. A spring is connected between the outer flange and the outer wall of the positioning cylinder 7. The spring is fitted onto the telescopic rod 13 between the outer flange and the outer wall of the positioning cylinder 7. The two ends of the spring are fixedly connected to the outer flange and the outer wall of the positioning cylinder 7, respectively. Under the action of the spring, the other end of the telescopic rod 13 is pressed against the conical surface of the cone 14 of the shaped bolt 15.

[0036] Furthermore, the overall assembly process of this noise-reducing axial flow fan is as follows: Step 1: Rotate the irregular bolt 15 from top to bottom through the threaded hole reserved in the frame 6; after the lower end of the irregular bolt 15 extends out of the bottom of the frame 6, tighten the cone 14 from bottom to top and fix it to the lower end of the irregular bolt 15, thus completing the pre-installation of the irregular bolt 15 and the cone 14 on the frame 6. Step 2: Insert the inverted convex rubber sleeve 10 into the insertion hole 9 opened in the frame 6, and then pass the lifting rod 8 through the central through hole of the rubber sleeve 10 from bottom to top, and fix the top of the lifting rod 8 above the frame 6 coaxially with the blocking plate 11, so that the blocking plate 11 is pressed against the upper surface of the rubber sleeve 10. Step 3: Place the sponge ring 5 on the outer circumference of both ends of the air duct 2, and insert both ends of the air duct 2 into the connecting cylinder 4 in the openings on both sides of the bottom of the box body 1, so that the sponge ring 5 is pressed tightly between the outer wall of the air duct 2 and the inner wall of the connecting cylinder 4, thus completing the flexible support and damping seal at both ends of the air duct 2. Step 4: Align the opening at the upper end of the positioning cylinder 7 on the fan assembly with the lower end of the upper suspension rod 8, so that the lower end of the suspension rod 8 is inserted into the positioning cylinder 7. At this time, the hemispherical end of the telescopic rod 13 is in contact with the conical surface of the cone 14. Step 5: Tighten the irregular bolt 15 on the top of the frame 6 clockwise. The irregular bolt 15 is pushed down along the threaded hole of the frame 6, which drives the cone 14 at the bottom to move down synchronously. During the downward movement of the cone 14, its conical inclined surface pushes against the ends of the telescopic rods 13 on both sides, pushing the telescopic rods 13 on both sides to overcome the spring return resistance and move horizontally towards the axis, passing through the through hole of the side wall of the positioning cylinder 7 and tightly locking into the annular groove 12 at the lower end of the hanger 8, thereby achieving the locking and fixing between the air duct 2 and the hanger 8.

[0037] The usage process of this utility model is as follows: When the fan 3 is running, on the one hand, the entire fan 3 and the air duct 2 are enclosed by the housing 1. The housing 1 is made of polyurethane hand-made panels. The housing 1 can isolate most of the noise generated when the fan 3 is running. On the other hand, the inner wall of the housing 1 and the outer wall of the air duct 2 are covered with sound insulation cotton to further reduce noise transmission. The multi-layer covering structure can effectively block outward air noise.

[0038] In addition, with the help of the frame 6 and the flexible suspension module, the entire air duct 2 and the fan 3 are suspended in the housing 1. The suspension rod 8 of the flexible suspension module is inserted into the socket 9, and the socket 9 is embedded with a rubber sleeve 10, so that the suspension rod 8 and the frame 6 are in a soft connection state. In this way, the vibration generated by the fan 3 when it is running can be transmitted to the housing 1 less. The flexible suspension module cuts off the rigid vibration transmission, and uses elastic vibration isolation and damping dissipation to weaken the vibration transmission and eliminate low frequency resonance. It further works with the housing 1 to block the outward air noise.

[0039] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should be considered within its protection scope.

Claims

1. A multi-layer encapsulated silencing and noise-reducing axial flow fan, characterized in that: The inner wall of the enclosure (1) is lined with sound insulation cotton; And located inside the box (1): The frame (6) is horizontally fixed to the top inside the housing (1); The fan assembly is installed inside the housing (1), suspended from the top on the frame (6), and the outer perimeter is covered with sound insulation cotton; A flexible suspension module is connected between the top of the wind turbine assembly and the frame (6); The flexible covering component is flexibly covering both ends of the wind turbine assembly and flexibly supported between each end of the wind turbine assembly and the housing (1).

2. The multi-layer encapsulated noise-reducing axial flow fan according to claim 1, characterized in that: The fan assembly includes a duct (2) and a fan (3). The fan (3) is fixedly installed inside the duct (2). Openings are provided on both sides of the bottom of the box (1). The two ends of the duct (2) are respectively connected to the openings on both sides of the bottom of the box (1) through a flexible covering component.

3. The multi-layer encapsulated noise-reducing axial flow fan according to claim 2, characterized in that: The flexible covering component includes a connecting cylinder (4) and a sponge ring (5). The connecting cylinder (4) is coaxially fixedly fitted inside the opening. The ends of the air duct (2) extend into the connecting cylinder (4). The sponge ring (5) is sandwiched between the outer wall of the end of the air duct (2) and the inner wall of the connecting cylinder (4).

4. The multi-layer encapsulated noise-reducing axial flow fan according to claim 1, characterized in that: The flexible suspension module includes two suspension components and a special bolt (15). The upper and lower ends of the two suspension components are connected between the frame (6) and the fan component. The upper end of the special bolt (15) passes through the threaded hole opened in the frame (6) through a threaded connection. The two suspension components are symmetrically arranged on both sides of the special bolt (15) and are connected to the lower end of the special bolt (15).

5. A multi-layer encapsulated noise-reducing axial flow fan according to claim 4, characterized in that: Each suspension assembly includes a positioning cylinder (7), a suspension rod (8), a rubber sleeve (10), a blocking plate (11), and a telescopic rod (13). The frame (6) has a through hole (9). A suspension rod (8) is flexibly inserted into the through hole (9) through the rubber sleeve (10). The upper end of the suspension rod (8) passes through the through hole (9) of the frame (6) and is coaxially fixedly connected to a blocking plate (11). The lower end of the suspension rod (8) is connected to the upper end of the positioning cylinder (7) through the telescopic rod (13) and a spring in an elastically movable pin manner. The lower end of the positioning cylinder (7) is fixed to the top surface of the fan assembly. Furthermore, the telescopic rods (13) of the two suspension assemblies are respectively on both sides of the shaped bolt (15) and are connected to the lower end of the shaped bolt (15).

6. A multi-layer encapsulated noise-reducing axial flow fan according to claim 5, characterized in that: The diameter of the blocking disc (11) is larger than the diameter of the jack (9).

7. A multi-layer encapsulated noise-reducing axial flow fan according to claim 5, characterized in that: The lower end of the irregular bolt (15) is set as a cone (14); the lower end of the rod (8) is provided with an annular groove (12) on the outer periphery; one end of the telescopic rod (13) is movably passed through the side wall of the positioning cylinder (7) and then embedded in the annular groove (12); the middle part of the telescopic rod (13) is fixedly connected to the outer side wall of the positioning cylinder (7) by a spring; the other end of the telescopic rod (13) is used as a contact end to contact the cone surface of the irregular bolt (15) cone (14), and the contact end is hemispherical and covered with rubber material.

8. A multi-layer encapsulated noise-reducing axial flow fan according to claim 5, characterized in that: The telescopic rod (13) has an outer flange in the middle. A spring is fitted on the telescopic rod (13) between the outer flange and the outer wall of the positioning cylinder (7). The two ends of the spring are fixedly connected to the outer flange and the outer wall of the positioning cylinder (7), respectively.

9. A multi-layer encapsulated noise-reducing axial flow fan according to claim 5, characterized in that: The rubber sleeve (10) is in the shape of an inverted convex character and has a central through hole for the rod (8) to pass through. The lower part of the rubber sleeve (10) is embedded between the inner wall of the insertion hole (9) and the outer periphery of the rod (8), and the upper part of the rubber sleeve (10) extends horizontally and is sandwiched between the lower end face of the blocking plate (11) and the upper surface of the frame (6).

10. A multi-layer encapsulated noise-reducing axial flow fan according to claim 1, characterized in that: The box body (1) is made of polyurethane handmade panels spliced ​​together, and the polyurethane handmade panels are composed of a metal panel and a rigid closed-cell PU core material.

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