An adaptive noise reduction computer fan

Abstract

The application discloses a self-adaptive noise reduction computer fan and relates to the technical field of computer cooling fans, which comprises a casing, a processing mechanism arranged in the casing, the processing mechanism comprising a rotating motor, the bottom surface of the rotating motor being fixedly connected with the inner wall of the casing, a connecting pipe being fixedly installed at the output end of the rotating motor, a plurality of fan blade bodies being rotatably connected in the connecting pipe, a connecting block being fixedly installed on the inner wall of the casing, a display screen being fixedly installed on the inner wall of the connecting block, an adjusting mechanism being arranged in the casing, and a noise reduction assembly being arranged in the casing. The self-adaptive noise reduction computer fan is provided with the adjusting mechanism, so that when the device operates at low temperature, the inclination of the fan blade body is reduced, the airflow disturbance noise is reduced, and silent operation is realized. When the device operates at high temperature and high load, the inclination of the fan blade body is increased, so that the device can obtain larger air volume and air pressure at a lower rotating speed, and the noise during operation of the device is reduced.

Description

Technical Field

[0001] This invention relates to the field of computer cooling fan technology, specifically to an adaptive noise reduction computer fan. Background Technology

[0002] Computer fans are core heat dissipation components for desktop computers, laptops, servers, and other devices. Their operational stability, heat dissipation efficiency, and noise level directly affect the user experience and lifespan of the computer.

[0003] In the current technology, computer cooling fans generate a lot of turbulence and eddy noise when the fan blades are rotating and cutting the air at high speed. Most computer cooling fans only rely on optimizing the streamlined shape of the fan blades or adding a single sound insulation cotton structure to reduce noise. This makes it difficult to meet the requirements of low noise and efficient heat dissipation under all working conditions. As a result, long-term high-noise operation of computer cooling fans can easily cause auditory fatigue in users.

[0004] Combining the above issues, we find that existing adaptive noise-reducing computer fans cannot simultaneously avoid the problems mentioned above during use. Even if they can be solved, they require external tools, thus failing to achieve the desired effect. Therefore, we propose an adaptive noise-reducing computer fan. Summary of the Invention

[0005] The purpose of this invention is to provide an adaptive noise-reducing computer fan to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an adaptive noise reduction computer fan, comprising a housing, wherein a processing mechanism is disposed inside the housing; The processing mechanism includes a rotating motor, the bottom surface of which is fixedly connected to the inner wall of the housing, a connecting pipe fixedly installed at the output end of the rotating motor, a plurality of fan blade bodies rotatably connected inside the connecting pipe, a connecting block fixedly installed on the inner wall of the housing, and a display screen fixedly installed on the inner wall of the connecting block. An adjustment mechanism is provided inside the housing. The adjustment mechanism includes a noise reduction shell. The inner wall of the noise reduction shell is fixedly connected to the outer surface of the housing. A temperature sensor and a controller are fixedly installed on the inner wall of the housing. A noise reduction component is provided inside the housing.

[0007] Preferably, a rotating shaft is fixedly installed at one end of each fan blade body through a connecting pipe, and a connecting gear is fixedly installed at one end of each rotating shaft. A fixing pipe is fixedly installed on the inner wall of the connecting pipe, and a memory alloy spring is fixedly installed on the inner wall of the fixing pipe. A piston rod is fixedly installed at one end of each memory alloy spring, and a moving plate is fixedly installed at one end of the piston rod through the fixing pipe. Several rack plates are fixedly installed on the outer surface of the moving plate, and the outer surface of each rack plate meshes with the outer surface of the connecting gear. Two electric push rods are fixedly installed on the inner wall of the connecting pipe, and the electric push rods and the temperature sensor are electrically connected to the controller through a contact ring and a wire.

[0008] Preferably, the noise reduction component includes a connecting plate, the outer surface of which is fixedly connected to the inner wall of the housing. The outer surface of the connecting plate has several sliding grooves. A connecting bearing is fixedly installed on the inner wall of the housing. A rotating disk is fixedly installed on the inner wall of the inner ring of the connecting bearing. A rack ring is fixedly installed on the outer surface of the rotating disk. A rotary motor is installed inside the housing. A fixed gear is fixedly installed at the output end of the rotary motor. The outer surface of the fixed gear meshes with the inner wall of the rack ring. A connecting groove is formed on the outer surface of the rotating disk. Several guide plates are slidably connected inside the connecting groove. A connecting post is fixedly installed on the outer surface of each guide plate. Each connecting post is slidably connected inside the sliding groove. Several air outlets are formed on the outer surface of each guide plate.

[0009] Preferably, a dustproof mesh is snapped into the inside of the housing, and a number of fixing bolts are provided inside the dustproof mesh. One end of each fixing bolt passes through the dustproof mesh and is threadedly connected to the inner wall of the housing.

[0010] Preferably, a bearing bracket is fixedly installed on the inner wall of the housing, and the inner wall of the inner ring of the bearing bracket is fixedly connected to the outer surface of the connecting pipe.

[0011] Preferably, a fixed bearing is fixedly installed on the outer surface of the connecting block, and the outer surface of the inner ring of the fixed bearing is fixedly connected to the outer surface of the connecting pipe.

[0012] Preferably, a telescopic column is fixedly installed on the inner wall of the fixed tube, and the telescopic end of the telescopic column is fixedly connected to the outer surface of the piston rod.

[0013] Preferably, a plurality of limiting blocks are fixedly installed on the inner wall of the connecting pipe, and two sliders are fixedly installed on the outer surface of each rack plate, and each slider is slidably connected inside the limiting block.

[0014] Preferably, a fixed platform is fixedly mounted on the outer surface of the rotary motor, and the outer surface of the fixed platform is fixedly connected to the inner wall of the housing.

[0015] Preferably, a plurality of connecting ears are fixedly installed on the outer surface of the noise reduction shell, and each connecting ear is provided with a connecting bolt inside.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention incorporates an adjustment mechanism that, based on the thermal expansion and elongation characteristics of shape memory alloy springs, allows the computer cooling fan to operate at low temperatures inside the computer. By reducing the tilt angle of the fan blades, the fan blades become flatter, thereby reducing airflow disturbance noise and achieving quiet operation. Under high temperature and high load conditions, the tilt angle of the fan blades increases, enabling the device to obtain a larger air volume and air pressure at a lower speed, avoiding the need to simply increase the speed to increase air volume, and thus reducing the noise during device operation.

[0017] 2. This invention incorporates a noise reduction component, which forces the generated airflow through the outlet when the device operates at low temperatures. This process organizes the turbulent vortex into numerous parallel, uniform micro-airflow streams, ensuring that these micro-airflows do not interfere with each other and flow very smoothly, resulting in extremely low noise. When the device operates at high temperatures, the airflow is separated by a guide plate, preventing the airflow from flowing through narrow gaps and causing whistling noise. This further reduces noise, ensuring a balance between noise reduction and efficient heat dissipation during computer cooling. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the cross-sectional view of the casing of the present invention; Figure 3 This is a schematic diagram of the connecting pipe of the present invention; Figure 4 This is a schematic diagram of the cross-sectional view of the connecting pipe of the present invention; Figure 5 This is a structural schematic diagram of the fixed tube cross-section of the present invention; Figure 6 This is a schematic diagram of the connecting disk of the present invention; Figure 7 This is a schematic diagram of the rear view of the rack ring of the present invention; Figure 8 This is a schematic diagram of the structure of the guide plate of the present invention.

[0019] In the picture: 1. Housing; 2. Processing mechanism; 201. Rotary motor; 202. Connecting pipe; 203. Fan blade body; 204. Connecting block; 205. Display screen; 3. Adjustment mechanism; 301. Noise-reducing housing; 302. Temperature sensor; 303. Controller; 304. Rotating shaft; 305. Connecting gear; 306. Fixing tube; 307. Memory alloy spring; 308. Piston rod; 309. Moving plate; 310. Rack plate; 311. Electric push rod; 4. Noise reduction components; 401. Connecting plate; 402. Sliding groove; 403. Connecting bearing; 404. Rotating plate; 405. Rack ring; 406. Rotary motor; 407. Fixed gear; 408. Connecting groove; 409. Guide plate; 410. Connecting column; 411. Air outlet; 5. Dustproof net; 6. Fixing bolts; 7. Bearing bracket; 8. Fixed bearing; 9. Telescopic column; 10. Limiting block; 11. Sliding block; 12. Fixing platform; 13. Connecting lug; 14. Connecting bolts. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1: Please refer to Figures 1-5 This invention provides a technical solution: an adaptive noise-reducing computer fan, including a housing 1, with a processing mechanism 2 inside the housing 1. The processing mechanism 2 includes a rotating motor 201, the bottom surface of which is fixedly connected to the inner wall of the housing 1. A connecting pipe 202 is fixedly installed at the output end of the rotating motor 201, and a plurality of fan blade bodies 203 are rotatably connected inside the connecting pipe 202. A connecting block 204 is fixedly installed on the inner wall of the housing 1, and a display screen 205 is fixedly installed on the inner wall of the connecting block 204. The display screen 205 can synchronously read data such as the body temperature and fan operating status. The power provided by the rotating motor 201 drives the connecting pipe 202 and the fan blade bodies 203 to rotate, thereby achieving the function of heat dissipation inside the computer case.

[0022] An adjustment mechanism 3 is installed inside the casing 1.

[0023] As a further definition of the adjustment mechanism 3 of the present invention, the adjustment mechanism 3 includes a noise reduction shell 301. The noise reduction shell 301 is made of ABS flame-retardant modified plastic, which has sound absorption and sound insulation effects, and can reduce the mid-to-high frequency wind noise and motor mechanical noise generated by the device. The inner wall of the noise reduction shell 301 is fixedly connected to the outer surface of the housing 1. A temperature sensor 302 and a controller 303 are respectively fixedly installed on the inner wall of the housing 1. The temperature sensor 302 is an NTC-50K-3950 patch type, which has the characteristics of vibration resistance, temperature resistance and small size. The controller 303... The model number of device 03 is STM32F103C8T6. This device uses a DC12V power supply from the computer chassis, with an added 1000μF filter capacitor to suppress voltage noise generated by the fan motor's start and stop, protecting the controller 303 and the sensor. Each fan blade body 203 has a connecting tube 202 through which a rotating shaft 304 is fixedly installed. Each rotating shaft 304 has a connecting gear 305 fixedly installed at one end. A fixing tube 306 is fixedly installed on the inner wall of the connecting tube 202, and a memory [device / equipment] is fixedly installed on the inner wall of the fixing tube 306. Alloy spring 307, and memory alloy spring 307, each have a piston rod 308 fixedly mounted at one end. One end of the piston rod 308 passes through the fixed tube 306 and is fixedly mounted with a movable plate 309. Several rack plates 310 are fixedly mounted on the outer surface of the movable plate 309. The outer surface of each rack plate 310 meshes with the outer surface of the connecting gear 305. Two electric push rods 311 are fixedly mounted on the inner wall of the connecting tube 202. The electric push rods 311 and the temperature sensor 302 are electrically connected to the controller 303 through a contact ring and a wire. The adjustment mechanism 3 allows the computer cooling fan to operate at low temperatures inside the computer by reducing the tilt angle of the fan blade body 203, making the fan blade body 203 flatter, thereby reducing airflow disturbance noise and achieving silent operation, based on the thermal expansion and elongation characteristics of the shape memory alloy spring 307.

[0024] A dustproof mesh 5 is snapped into the inside of the casing 1. Several fixing bolts 6 are installed inside the dustproof mesh 5. One end of each fixing bolt 6 passes through the dustproof mesh 5 and is threaded to the inner wall of the casing 1. The dustproof mesh 5 is snapped into the air inlet of the casing 1 and the fixing bolts 6 are used to lock the dustproof mesh 5, thereby preventing dust from entering the air duct and internal components.

[0025] A bearing bracket 7 is fixedly installed on the inner wall of the housing 1. The inner wall of the inner ring of the bearing bracket 7 is fixedly connected to the outer surface of the connecting pipe 202. The installation of the bearing bracket 7 plays a role in stabilizing the connecting pipe 202, thereby preventing the connecting pipe 202 from shaking when rotating.

[0026] A fixed bearing 8 is fixedly installed on the outer surface of the connecting block 204. The outer surface of the inner ring of the fixed bearing 8 is fixedly connected to the outer surface of the connecting pipe 202. The installation of the fixed bearing 8 increases the rotational stability of the connecting pipe 202, thereby preventing the connecting pipe 202 from swaying during rotation and further increasing the rotational stability of the connecting pipe 202.

[0027] A telescopic column 9 is fixedly installed on the inner wall of the fixed tube 306. The telescopic end of the telescopic column 9 is fixedly connected to the outer surface of the piston rod 308. The installation of the telescopic column 9 serves to limit the movement trajectory of the piston rod 308, thereby preventing the piston rod 308 from deviating from its movement trajectory when moving.

[0028] Several limiting blocks 10 are fixedly installed on the inner wall of the connecting pipe 202. Two sliders 11 are fixedly installed on the outer surface of each rack plate 310. Each slider 11 is slidably connected inside the limiting block 10. The limiting blocks 10 installed on the inner wall of the connecting pipe 202 simultaneously engage the sliders 11 on both sides of the rack plate 310 into the limiting block 10, thereby restricting the movement trajectory of the rack plate 310 and preventing transmission deviation.

[0029] The specific implementation of this embodiment is as follows: Temperature sensor 302 collects real-time temperature data inside the computer chassis and continuously transmits electrical signals to controller 303. When the detected temperature is lower than a preset low-temperature threshold, controller 303 determines that the device has entered a low-load operating condition and issues a silent operation command. At this time, the ambient temperature is low, and the memory alloy spring 307 is in a normal temperature contraction state, pulling the piston rod 308, moving plate 309, and rack plate 310 back towards the fixed tube 306. This causes the rack plate 310 to drive the meshing connecting gear 305 to rotate, synchronously adjusting all fan blade bodies 203 through rotating shaft 304, reducing the tilt angle of the fan blade bodies 203, making the fan blade bodies 203 generally approach a planar state. Simultaneously, rotating motor 201 drives the connecting tube 202 and fan blade bodies 203 to rotate at a low speed, causing the flat fan blade bodies 203 to cut... When cutting the air, airflow disturbance is greatly reduced, reducing turbulence noise at the sound source. When the temperature sensor 302 detects that the temperature exceeds the standard, it sends a high temperature signal to the controller 303. The controller 303 switches the working mode to balance heat dissipation efficiency and noise reduction requirements. At this time, the high temperature inside the computer case causes the shape memory alloy spring 307 to stretch due to heat, pushing the piston rod 308, the moving plate 309 and the rack plate 310 to move outward. This causes the rack plate 310 to drive the connecting gear 305 to rotate in the opposite direction. In turn, the connecting gear 305 increases the tilt angle of the fan blade body 203 through the rotating shaft 304. This allows the fan blade body 203 with a large tilt angle to produce a larger air volume and air pressure when rotating without significantly increasing the speed of the rotating motor 201, meeting the heat dissipation requirements of high-load hardware. At the same time, it avoids the sharp wind noise and motor mechanical noise caused by traditional fans that rely on increasing the speed to increase the air volume.

[0030] Example 2: Please refer to Figure 1 , Figure 2 , Figures 6-8 The present invention provides a technical solution: an adaptive noise reduction computer fan. The present invention makes corresponding improvements to the technical problems mentioned in the background art. The noise reduction component 4 is provided inside the casing 1.

[0031] As a further definition of the noise reduction component 4 of the present invention, the noise reduction component 4 includes a connecting disk 401, the outer surface of the connecting disk 401 being fixedly connected to the inner wall of the housing 1, a plurality of sliding grooves 402 being formed on the outer surface of the connecting disk 401, a connecting bearing 403 being fixedly installed on the inner wall of the housing 1, a rotating disk 404 being fixedly installed on the inner wall of the inner ring of the connecting bearing 403, a rack ring 405 being fixedly installed on the outer surface of the rotating disk 404, a rotating motor 406 being disposed inside the housing 1, a fixed gear 407 being fixedly installed on the output end of the rotating motor 406, the outer surface of the fixed gear 407 meshing with the inner wall of the rack ring 405, a connecting groove 408 being formed on the outer surface of the rotating disk 404, a plurality of guide plates 409 being slidably connected inside the connecting groove 408, each guide plate 409... Each of the 9 components has a fixed connecting post 410 on its outer surface. Each connecting post 410 is slidably connected to the inside of the sliding groove 402. Each guide plate 409 has several air outlets 411 on its outer surface. By incorporating a noise reduction component 4, the device forces the generated airflow through the air outlets 411 when operating at low temperatures, thereby dispersing the turbulent vortex into countless parallel and uniform micro airflow streams. This prevents these micro airflows from interfering with each other and ensures very smooth flow, resulting in extremely low noise. When the device operates at high temperatures, the guide plates 409 separate the airflows, preventing the airflow from passing through narrow gaps and causing whistling noise. This further reduces noise and ensures a balance between noise reduction and efficient heat dissipation during computer cooling.

[0032] A fixed platform 12 is fixedly installed on the outer surface of the rotary motor 406. The outer surface of the fixed platform 12 is fixedly connected to the inner wall of the housing 1. The installation of the fixed platform 12 serves to fix the rotary motor 406, thereby preventing the rotary motor 406 from rotating on its own during operation, and thus ensuring the stability of the rotary motor 406 during operation.

[0033] Several connecting ears 13 are fixedly installed on the outer surface of the noise reduction shell 301. Each connecting ear 13 has a connecting bolt 14 inside. The connecting ears 13 and connecting bolts 14 are reserved on the outer side of the noise reduction shell 301 for fixing the entire fan to the computer case or motherboard heat dissipation position.

[0034] The specific implementation of this embodiment is as follows: When the detected temperature is lower than the preset low temperature threshold, the controller 303 determines that the equipment has entered a low load condition and issues a silent operation command. The controller 303 simultaneously starts the rotary motor 406, using the power provided by the rotary motor 406 to drive the fixed gear 407 to rotate. This causes the fixed gear 407 to drive the rack ring 405 and the rotating disk 404 to rotate at a low speed. As a result, the multiple sets of guide plates 409 are restricted by the trajectory of the sliding groove 402 and the connecting groove 408, causing them to move closer together and gradually reduce the gap between them. This forces the airflow blown out by the fan blade body 203 to enter the guide plate 409 area and pass through the dense air outlets 411 on the surface of the guide plate 409, thus reducing the originally chaotic and large volume of airflow. The airflow vortex is broken down into multiple uniform and fine parallel airflows, making the airflow more stable and completely eliminating vortex noise and airflow turbulence noise. When the temperature sensor 302 detects that the temperature exceeds the standard, it sends a high temperature signal to the controller 303. The controller 303 switches the working mode to balance heat dissipation efficiency and noise reduction requirements. The controller 303 controls the rotary motor 406 to run in reverse, so that the rotary motor 406 drives the rotary disk 404 to rotate, thereby causing the guide plate 409 to slide in the connecting groove 408 and the sliding groove 402. The guide plates 409 are separated from each other and the gap is widened, so that the high air volume airflow can flow normally through the large gap between the guide plates 409, avoiding the whistling noise generated by the high-speed airflow passing through the narrow gap.

[0035] Specifically, when using this device: First, the temperature sensor 302 collects the internal temperature data of the computer chassis in real time and continuously transmits the electrical signal to the controller 303. When the detected temperature is lower than the preset low temperature threshold, the controller 303 determines that the equipment has entered a low load condition and issues a silent operation command. At this time, the ambient temperature is low, and the memory alloy spring 307 is in a normal temperature contraction state, pulling the piston rod 308, the moving plate 309 and the rack plate 310 to retract to the side of the fixed tube 306. This causes the rack plate 310 to drive the meshing connecting gear 305 to rotate. Through the rotating shaft 304, all fan blade bodies 203 are adjusted synchronously to reduce the tilt angle of the fan blade bodies 203, so that the fan blade bodies 203 are close to a planar state. At the same time, the rotating motor 201 drives the connecting tube 202 and the fan blade bodies 203 to rotate at a low speed, so that the airflow disturbance when the flat fan blade bodies 203 cut the air is greatly reduced, and the turbulence noise is reduced from the sound source. Then, the controller 303 synchronously starts the rotary motor 406, and uses the power provided by the rotary motor 406 to drive the fixed gear 407 to rotate. The fixed gear 407 drives the rack ring 405 and the rotating disk 404 to rotate at low speed. As a result, the multiple sets of guide plates 409 are restricted by the trajectory of the sliding groove 402 and the connecting groove 408, causing the gaps between them to gradually decrease. This forces the airflow blown out by the fan blade body 203 to enter the area of ​​the guide plate 409 and pass through the dense air outlets 411 on the surface of the guide plate 409. This breaks down the originally chaotic and large airflow vortex into multiple uniform and fine parallel airflows, making the airflow more stable and completely eliminating vortex noise and airflow turbulence noise. Furthermore, when the temperature sensor 302 detects an excessive temperature, it sends a high-temperature signal to the controller 303. The controller 303 then switches its operating mode, balancing heat dissipation efficiency and noise reduction requirements. At this time, the high temperature inside the computer case causes the shape memory alloy spring 307 to stretch, pushing the piston rod 308, the moving plate 309, and the rack plate 310 outward. This causes the rack plate 310 to drive the connecting gear 305 to rotate in the opposite direction. Consequently, the connecting gear 305 increases the tilt angle of the fan blade body 203 via the rotating shaft 304, allowing the large-tilt fan blade body 203 to rotate without significantly increasing the rotation motor 201. The increased rotation speed produces greater airflow and air pressure, meeting the heat dissipation needs of high-load hardware. At the same time, it avoids the sharp wind noise and motor mechanical noise caused by traditional fans that rely on increasing rotation speed to increase airflow. Meanwhile, the controller 303 controls the rotary motor 406 to rotate in reverse, causing the rotary motor 406 to drive the rotary disk 404 to rotate. This allows the guide plate 409 to slide within the connecting groove 408 and the sliding groove 402. The guide plates 409 separate from each other, and the gaps widen, allowing high-volume airflow to flow normally through the large gaps between the guide plates 409, avoiding the whistling noise caused by high-speed airflow passing through narrow gaps.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adaptive noise-reducing computer fan, comprising a casing (1), characterized in that: The housing (1) is equipped with a processing mechanism (2); The processing mechanism (2) includes a rotating motor (201), the bottom surface of which is fixedly connected to the inner wall of the housing (1), a connecting pipe (202) is fixedly installed at the output end of the rotating motor (201), a plurality of fan blade bodies (203) are rotatably connected inside the connecting pipe (202), a connecting block (204) is fixedly installed on the inner wall of the housing (1), and a display screen (205) is fixedly installed on the inner wall of the connecting block (204). An adjustment mechanism (3) is provided inside the housing (1). The adjustment mechanism (3) includes a noise reduction shell (301). The inner wall of the noise reduction shell (301) is fixedly connected to the outer surface of the housing (1). A temperature sensor (302) and a controller (303) are fixedly installed on the inner wall of the housing (1). A noise reduction component (4) is provided inside the housing (1).

2. The adaptive noise reduction computer fan according to claim 1, characterized in that: Each of the fan blade bodies (203) has a connecting pipe (202) through one end and a rotating shaft (304) fixedly installed thereon. Each of the rotating shafts (304) has a connecting gear (305) fixedly installed at one end. A fixing pipe (306) is fixedly installed on the inner wall of the connecting pipe (202). A memory alloy spring (307) is fixedly installed on the inner wall of the fixing pipe (306). A piston rod (308) is fixedly installed at one end of each memory alloy spring (307). One end of the 08) passes through the fixed tube (306) and is fixedly installed with a movable plate (309). Several rack plates (310) are fixedly installed on the outer surface of the movable plate (309). The outer surface of each rack plate (310) meshes with the outer surface of the connecting gear (305). Two electric push rods (311) are fixedly installed on the inner wall of the connecting tube (202). The electric push rods (311) and the temperature sensor (302) are electrically connected to the controller (303) through the contact ring and the wire.

3. The adaptive noise reduction computer fan according to claim 1, characterized in that: The noise reduction component (4) includes a connecting plate (401), the outer surface of which is fixedly connected to the inner wall of the housing (1). The outer surface of the connecting plate (401) has several sliding grooves (402). A connecting bearing (403) is fixedly installed on the inner wall of the housing (1). A rotating disk (404) is fixedly installed on the inner wall of the inner ring of the connecting bearing (403). A rack ring (405) is fixedly installed on the outer surface of the rotating disk (404). A rotary motor (406) is installed inside the housing (1). The output of the rotary motor (406)... A fixed gear (407) is fixedly installed at the outlet end. The outer surface of the fixed gear (407) meshes with the inner wall of the rack ring (405). A connecting groove (408) is opened on the outer surface of the rotating disk (404). Several guide plates (409) are slidably connected inside the connecting groove (408). A connecting column (410) is fixedly installed on the outer surface of each guide plate (409). Each connecting column (410) is slidably connected inside the sliding groove (402). Several air outlets (411) are opened on the outer surface of each guide plate (409).

4. The adaptive noise reduction computer fan according to claim 1, characterized in that: The casing (1) is fitted with a dustproof mesh (5), and the dustproof mesh (5) is provided with several fixing bolts (6). One end of each fixing bolt (6) passes through the dustproof mesh (5) and is threadedly connected to the inner wall of the casing (1).

5. The adaptive noise reduction computer fan according to claim 1, characterized in that: The inner wall of the housing (1) is fixedly installed with a bearing bracket (7), and the inner wall of the inner ring of the bearing bracket (7) is fixedly connected to the outer surface of the connecting pipe (202).

6. The adaptive noise reduction computer fan according to claim 1, characterized in that: A fixed bearing (8) is fixedly installed on the outer surface of the connecting block (204), and the outer surface of the inner ring of the fixed bearing (8) is fixedly connected to the outer surface of the connecting pipe (202).

7. An adaptive noise-reducing computer fan according to claim 2, characterized in that: The inner wall of the fixed tube (306) is fixedly installed with a telescopic column (9), and the telescopic end of the telescopic column (9) is fixedly connected to the outer surface of the piston rod (308).

8. An adaptive noise-reducing computer fan according to claim 2, characterized in that: The inner wall of the connecting pipe (202) is fixedly installed with several limiting blocks (10), and two sliders (11) are fixedly installed on the outer surface of each rack plate (310), and each slider (11) is slidably connected inside the limiting block (10).

9. An adaptive noise-reducing computer fan according to claim 3, characterized in that: A fixed platform (12) is fixedly installed on the outer surface of the rotary motor (406), and the outer surface of the fixed platform (12) is fixedly connected to the inner wall of the housing (1).

10. An adaptive noise-reducing computer fan according to claim 2, characterized in that: The outer surface of the noise reduction shell (301) is fixedly equipped with a number of connecting ears (13), and each connecting ear (13) is provided with a connecting bolt (14).

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