A fan silencer with adjustable blade angle

Abstract

This invention discloses a fan silencer with adjustable blade angle, relating to the technical field of air conditioning fan equipment. It includes an outer casing assembly, a blade assembly, and an adjustment assembly, with multiple blade assemblies and adjustment assemblies provided. The adjustment assembly includes a blade deflection mechanism, a drive mechanism, and a blade angle adjustment mechanism. The blade assembly includes two fixed sleeve rods. This fan silencer with adjustable blade angle uses a drive mechanism to provide driving force, causing the main adjusting gear, driven gear, first synchronous gear, second synchronous gear, third synchronous gear, and fourth synchronous gear to simultaneously drive the I-beam shaft to rotate, thereby driving the blade deflection mechanism. This provides the advantage of simultaneous blade angle adjustment. When the airflow is low and the noise is high, the blades retract; when the airflow is high and the noise is low, the blades expand. This solves the problem of poor adaptability caused by the fixed angle of existing V-shaped blades.

Description

Technical Field

[0001] This invention relates to the field of air conditioning fan equipment technology, specifically to a fan silencer with adjustable blade angle. Background Technology

[0002] As the core power equipment in industrial ventilation, air conditioning, heating, ventilation and cooling systems, fans generate strong aerodynamic noise during operation, making them one of the main noise sources in industrial and building environments. To control fan noise, silencers are usually installed at the air inlet, air outlet or in the duct. Traditional V-blade fan silencers use multiple sets of V-shaped silencing blades to divert and guide airflow, while using sound-absorbing materials inside the blades to absorb mid-to-high frequency noise. They are characterized by compact structure, good airflow stability and convenient installation, and are widely used in fan noise reduction systems.

[0003] In existing technologies, the V-shaped blades in traditional V-blade fan silencers are all fixed in installation and have an angle that cannot be adjusted. Since the blade angle and installation position are fixed after leaving the factory, they cannot be adaptively adjusted according to the actual operating conditions of the fan. When the fan's air volume and air pressure change, the fixed-angle blades cannot reduce wind resistance and air volume loss by increasing the angle, nor can they extend the sound wave path and improve the noise reduction effect by decreasing the angle. Therefore, they cannot adapt to the noise control and ventilation needs of different scenarios and different times.

[0004] Therefore, we propose a fan silencer with adjustable blade angle to solve the problems mentioned above. Summary of the Invention

[0005] The purpose of this invention is to provide a fan silencer with an adjustable blade angle, in order to solve the problem mentioned in the background art that the fixed angle of the existing V-shaped blades makes it impossible to adapt to the noise control and ventilation needs of different scenarios and time periods.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fan silencer with adjustable blade angle, comprising an outer protective assembly, a blade assembly, and an adjustment assembly, wherein multiple blade assemblies and adjustment assemblies are provided. Each adjustment assembly includes a blade deflection mechanism, a drive mechanism, and a blade angle adjustment mechanism. Each blade assembly includes two fixed sleeves, the outer surfaces of which are symmetrically fixed with perforated galvanized frames. The blade deflection mechanism is used to change the angle between the two perforated galvanized frames. The blade angle adjustment mechanism includes a main adjusting gear and a driven gear. A first connecting chain meshes between the outer surfaces of the main adjusting gear and the driven gear. A first synchronous gear is fixedly connected to the outer side of the driven gear. A second connecting chain meshes with the outer surface of the first synchronous gear. A second synchronous gear meshes with the inner wall of the second connecting chain. A third synchronous gear is fixedly connected to the inner side of the second synchronous gear. A third connecting chain meshes with the outer surface of the third synchronous gear. A fourth synchronous gear meshes with the inner wall of the third connecting chain.

[0007] Preferably, centrifugal glass wool is placed inside each of the perforated galvanized frames to absorb noise, a perforated galvanized plate is snapped onto the top of each of the perforated galvanized frames, an installation rod is fixedly installed inside each of the fixed sleeves, and the outer surfaces of the two fixed sleeves are in contact.

[0008] Preferably, the outer protective assembly includes two side support plates, a supporting bottom plate is fixedly connected between the bottoms of the two side support plates, a supporting top plate is fixedly connected between the tops of the two side support plates, a protective cover is fixedly connected to the outer surface of the two side support plates on opposite sides, and a protective plate is fixedly connected to the inner walls of both sides of the two protective covers.

[0009] Preferably, multiple positioning frames are embedded on the outer surfaces of both side support plates, and each positioning frame has two positioning holes on its outer surface. Two rotating holes are also provided on the outer surfaces of both side support plates below each positioning frame.

[0010] Preferably, the outer walls at both ends of each mounting rod are rotatably connected to the inner wall of each positioning hole, and the number of the plurality of blade assemblies corresponds to the number of the plurality of blade angle adjustment mechanisms.

[0011] Preferably, the blade deflection mechanism includes two connecting rods, both ends of which are fixedly connected to transmission gears. The outer surfaces of every two adjacent transmission gears are meshed together. An I-shaped rotating shaft is fixedly connected to the outer surface of each transmission gear on the side furthest from each other. The outer surface of each I-shaped rotating shaft is rotatably connected to the inner wall of each rotating hole. The driven gear, the third synchronous gear, and the fourth synchronous gear are fixedly installed on the I-shaped rotating shafts at corresponding positions.

[0012] Preferably, an eccentric shaft is fixedly connected to the outer surface of each transmission gear near the edge, a crank connecting rod is rotatably connected to the outer surface of each eccentric shaft, a positioning connecting shaft is rotatably connected to one end of each crank connecting rod, and each positioning connecting shaft is fixedly installed at the bottom of both ends of the perforated galvanized frame at the corresponding position.

[0013] Preferably, the drive mechanism includes a lifting frame, a drive motor is provided on the top of the lifting frame, a drive wheel is fixedly connected to the output shaft of the drive motor, a connecting belt is movably connected to the outer surface of the drive wheel, a driven wheel is movably connected to the inner wall of one end of the connecting belt, the driven wheel is fixedly installed on the outer surface of the main adjusting gear, and the lifting frame is fixedly installed outside one of the side support plates.

[0014] Preferably, a positioning groove is rotatably sleeved on the outer surface of the inner side of the main adjusting gear, and the positioning groove is fixedly installed on the outside of the side support plate. The main adjusting gear, driven gear, first synchronous gear, second synchronous gear, third synchronous gear and fourth synchronous gear have the same rotation speed and the same direction of rotation. The first connecting chain, second connecting chain and third connecting chain have the same running speed and the same running direction.

[0015] Preferably, a locking assembly is fixedly installed on the outer surface of one of the side support plates near the drive mechanism. The locking assembly includes a reinforcing base, a mounting seat is fixedly connected to the outer surface of the reinforcing base, an electric push rod is provided on the outer surface of the mounting seat, a locking plate is fixedly connected to one end of the electric push rod, and a locking friction surface is provided on one side of the inner wall of the locking plate, and the locking friction surface is inclined, which is used to generate friction with the outer surface of the drive wheel to assist the drive wheel in stopping.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. During use, the drive mechanism provides driving force, which causes the main adjusting gear, driven gear, first synchronous gear, second synchronous gear, third synchronous gear and fourth synchronous gear to drive the I-shaped rotating shaft to rotate simultaneously, thereby driving the blade deflection mechanism to operate. This has the advantage of adjusting the blade angle at the same time. When the air volume is small and the noise is large, the blades will retract; when the air volume is large and the noise is small, the blades will expand. This solves the problem of poor adaptability caused by the fixed angle of the existing V-shaped blades.

[0017] 2. During use, the angle of each set of blades can be adjusted by rotating multiple transmission gears through the adjustment of the gears. The blade material has both sound absorption effect and the benefit of improving strength. Among them, centrifugal glass wool, as the internal sound-absorbing material, can absorb the medium and high frequency noise generated by the fan and improve the overall noise reduction of the silencer. The perforated galvanized frame and perforated galvanized plate, as the external protective structure, improve the structural strength, keep the silencer blades in shape and prevent deformation, and also protect the internal centrifugal glass wool from being washed away, blown away and falling off by the airflow. The evenly perforated plates allow sound waves to enter the interior and be absorbed by the centrifugal glass wool, without significantly increasing wind resistance.

[0018] 3. During use, the locking assembly locks the drive wheel to prevent the self-locking function of the drive motor from failing. By activating the electric push rod, it extends and moves the locking plate towards the drive wheel. The locking friction surface gradually moves from contacting the surface of the drive wheel to tightly adhering to the surface of the drive wheel, generating axial compression on the drive wheel and increasing anti-slip friction, thereby preventing it from rotating when the fan vibrates during operation, thus achieving a locking effect. Attached Figure Description

[0019] Figure 1 This is a first-view perspective perspective view of a fan silencer with adjustable blade angle according to the present invention. Figure 2 This is a second-view perspective perspective view of a fan silencer with adjustable blade angle according to the present invention. Figure 3 This is a third-view perspective structural view of a fan silencer with adjustable blade angle according to the present invention. Figure 4 This is a fourth-view perspective structural view of a fan silencer with adjustable blade angle according to the present invention. Figure 5 This is a three-dimensional view of the blade assembly structure of a fan silencer with adjustable blade angle according to the present invention. Figure 6 This is a perspective view of the adjustment component of a fan silencer with adjustable blade angle according to the present invention. Figure 7 This is a perspective view of the drive mechanism of a fan silencer with adjustable blade angle according to the present invention. Figure 8 This is a three-dimensional view of the blade angle adjustment mechanism of a fan silencer with adjustable blade angle according to the present invention. Figure 9 This is a perspective view of the locking assembly of a fan silencer with adjustable blade angle according to the present invention.

[0020] In the picture: 1. Outer Protective Components; 101. Side Support Plate; 102. Support Base Plate; 103. Support Top Plate; 104. Protective Cover; 105. Protective Plate; 106. Positioning Frame; 107. Rotary Hole; 2. Blade Assembly; 201. Mounting Rod; 202. Fixing Sleeve Rod; 203. Perforated Galvanized Frame; 204. Centrifugal Glass Wool; 205. Perforated Galvanized Sheet; 3. Adjustment Components; 31. Blade Deflection Mechanism; 310. Connecting Rotary Rod; 311. Transmission Gear; 312. Eccentric Rotary Shaft; 313. Crank Connecting Rod; 314. Positioning Connecting Shaft; 315. I-Shaped Rotary Shaft; 32. Drive Mechanism; 320. Drive 321. Drive motor; 322. Connecting belt; 323. Driven wheel; 324. Lifting frame; 33. Blade angle adjustment mechanism; 330. Positioning slot; 331. Main adjusting gear; 332. Driven gear; 333. First connecting chain; 334. First synchronous gear; 335. Second connecting chain; 336. Second synchronous gear; 337. Third synchronous gear; 338. Third connecting chain; 339. Fourth synchronous gear; 4. Locking assembly; 401. Reinforcing base; 402. Mounting base; 403. Electric push rod; 404. Locking plate; 405. Locking friction surface. Detailed Implementation

[0021] 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.

[0022] Please see Figures 1 to 9 The present invention provides a technical solution: This invention provides a fan silencer with adjustable blade angle, comprising an outer protective assembly 1, a blade assembly 2, and an adjustment assembly 3. Multiple blade assemblies 2 and multiple adjustment assemblies 3 are provided. The adjustment assembly 3 includes a blade deflection mechanism 31, a drive mechanism 32, and a blade angle adjustment mechanism 33. The blade assembly 2 includes two fixed sleeves 202, and perforated galvanized frames 203 are symmetrically fixed to the outer surfaces of the two fixed sleeves 202. The blade deflection mechanism 31 is used to change the angle between the two perforated galvanized frames 203. The blade angle adjustment mechanism 33 includes a main adjusting gear 331 and a driven gear 332. A first connecting chain 333 meshes between the outer surfaces of the main adjusting gear 331 and the driven gear 332. A first synchronous gear 334 is fixedly connected to the outer side of the driven gear 332. A second connecting chain 335 meshes with the outer surface of the first synchronous gear 334, and a second synchronous gear 336 meshes with the inner wall of the second connecting chain 335. A third synchronous gear 337 is fixedly connected to the inner side of the second synchronous gear 336. A third connecting chain 338 is meshed with the outer surface of the third synchronous gear 337. A fourth synchronous gear 339 is meshed with the inner wall of the third connecting chain 338. The blade deflection mechanism 31 includes two connecting rods 310. Both ends of the two connecting rods 310 are fixedly connected to transmission gears 311. The outer surfaces of every two adjacent transmission gears 311 are meshed. An I-shaped rotating shaft 315 is fixedly connected to the outer surface of each transmission gear 311 on the side furthest away from each other. The outer surface of each I-shaped rotating shaft 315 is rotatably connected to the inner wall of each rotating hole 107. The driven gear 332, the third synchronous gear 337, and the fourth synchronous gear 339 are fixedly installed on the I-shaped rotating shaft 315 at the corresponding positions. An eccentric rotating shaft 312 is fixedly connected to the outer surface of each transmission gear 311 near the edge. A crank connecting rod 313 is rotatably connected to the outer surface of each eccentric rotating shaft 312.

[0023] In use, starting the drive motor 320 causes its output shaft to drive the drive wheel 321 to rotate. Connected by the belt 322, the driven wheel 323 rotates synchronously. Since the driven wheel 323 is fixed outside the main adjusting gear 331, it drives the main adjusting gear 331 to rotate. Therefore, the drive mechanism 32 provides driving force. Furthermore, through the connection of the first connecting chain 333, the second connecting chain 335, and the third connecting chain 338, the main adjusting gear 331, the driven gear 332, the first synchronous gear 334, the second synchronous gear 336, the third synchronous gear 337, and the fourth synchronous gear 339 rotate simultaneously. This allows for simultaneous adjustment of the blade angle. When the airflow is low and the noise is high, the blades retract; when the airflow is high and the noise is low, the blades expand, solving the problem of... Some V-shaped blades have a fixed included angle, which causes poor fit. However, by changing the rotation direction of the output shaft of the drive motor 320, the same set of blades can be unfolded or retracted. When the eccentric shafts 312 on the surfaces of the two meshing transmission gears 311 approach each other, the top of the crank connecting rod 313 will move obliquely upward, thus pushing one side of the blade in an obliquely upward direction. The blade will then rotate and move closer together with the mounting rod 201 as the rotation center. Conversely, when the eccentric shafts 312 on the surfaces of the two meshing transmission gears 311 move away from each other, the top of the crank connecting rod 313 will move obliquely downward, thus pulling one side of the blade in an obliquely downward direction. The blade will then rotate and unfold with the mounting rod 201 as the rotation center. Thus, the unfolding and retraction of the blades are achieved by changing the rotation direction of the output shaft of the drive motor 320.

[0024] It should also be noted that the blade assembly 2 includes two fixed sleeves 202, and perforated galvanized frames 203 are symmetrically fixed on the outer surfaces of the two fixed sleeves 202. The blade deflection mechanism 31 is used to change the included angle between the two perforated galvanized frames 203. Centrifugal glass wool 204 is placed inside each perforated galvanized frame 203, and the centrifugal glass wool 204 is used to absorb noise. A perforated galvanized plate 205 is snapped onto the top of each perforated galvanized frame 203. An installation rod 201 is fixedly installed inside each fixed sleeve 202, and the outer surfaces of the two fixed sleeves 202 are in contact with each other. The outer walls at both ends of each installation rod 201 are rotatably connected to the inner wall of each positioning hole. The number of multiple blade assemblies 2 corresponds to the number of multiple blade angle adjustment mechanisms 33.

[0025] Please see Figures 1 to 6By inserting two mounting rods 201 into the two positioning holes in the positioning frame 106, the two fixing sleeve rods 202 are symmetrically arranged. Therefore, the two sets of blades composed of perforated galvanized frame 203, centrifugal glass wool 204 and perforated galvanized plate 205 are symmetrically adjusted when the angle is adjusted. Each blade angle adjustment mechanism 33 adjusts a set of blades. Centrifugal glass wool 204, as an internal sound-absorbing material, can absorb the medium and high frequency noise generated by the fan and improve the overall noise reduction of the silencer. Perforated galvanized frame 203 and perforated galvanized plate 205, as external protective structures, improve structural strength, keep the silencer blades in shape and prevent deformation, and also protect the internal centrifugal glass wool 204 from being washed away, blown away and falling off by the airflow. The uniform perforations on the plate allow sound waves to enter the interior and be absorbed by the centrifugal glass wool 204 without significantly increasing wind resistance. Moreover, the galvanized layer has anti-corrosion and anti-rust capabilities, extending the service life of the silencer.

[0026] It should also be noted that the outer protective assembly 1 includes two side support plates 101. A support base plate 102 is fixedly connected between the bottoms of the two side support plates 101, and a support top plate 103 is fixedly connected between the tops of the two side support plates 101. A protective cover 104 is fixedly connected to the outer surface of the two side support plates 101 on opposite sides. A protective plate 105 is fixedly connected to the inner walls of both sides of the two protective covers 104. Multiple positioning frames 106 are embedded and installed on the outer surface of the two side support plates 101, and two positioning holes are opened on the outer surface of each positioning frame 106. Two rotating holes 107 are opened on the outer surface of the two side support plates 101 below each positioning frame 106.

[0027] Please see Figures 1 to 4 The two side support plates 101 serve as the main support structure, providing the main support function. The blade assembly 2, adjustment assembly 3, and locking assembly 4 are all installed on them. The top and bottom are connected by the support base plate 102 and the support top plate 103 to form an integral silencer frame, which can then be installed in the fan. The protective covers 104 and protective plates 105 set on both sides can protect the side structural components and can also be used for installation. Multiple mounting holes are opened on the protective covers 104, which can be used with bolts.

[0028] It should also be noted that the blade deflection mechanism 31 includes two connecting rods 310, both ends of which are fixedly connected to transmission gears 311. The outer surfaces of every two adjacent transmission gears 311 are meshed together. An I-shaped rotating shaft 315 is fixedly connected to the outer surface of each transmission gear 311 on the side furthest from each other. The outer surface of each I-shaped rotating shaft 315 is rotatably connected to the inner wall of each rotating hole 107. The driven gear 332, the third synchronous gear 337, and the fourth synchronous gear 339 are fixedly installed on the I-shaped rotating shaft 315 at the corresponding positions. An eccentric rotating shaft 312 is fixedly connected to the outer surface of each transmission gear 311 near the edge. A crank connecting rod 313 is rotatably connected to the outer surface of each eccentric rotating shaft 312. A positioning connecting shaft 314 is rotatably connected to one end of each crank connecting rod 313. Each positioning connecting shaft 314 is fixedly installed at the bottom of both ends of the perforated galvanized frame 203 at the corresponding positions.

[0029] Please see Figures 3 to 6 The first connecting chain 333, the second connecting chain 335, and the third connecting chain 338 mesh with the main adjusting gear 331, the driven gear 332, the first synchronous gear 334, the second synchronous gear 336, the third synchronous gear 337, and the fourth synchronous gear 339, causing them to drive the connected I-shaped rotating shaft 315 to rotate synchronously. Each I-shaped rotating shaft 315 rotates inside the corresponding rotating hole 107. The I-shaped rotating shaft 315 drives the transmission gear 311 to rotate. With the meshing connection of two adjacent transmission gears 311 and the same group of transmission gears 311 being fixed by the connecting rod 310, the transmission gears 311 in the same blade angle adjustment mechanism 33 rotate simultaneously. The crank connecting rod 313 movably connects the two ends of the blades on both sides, thereby changing the blade angle. Only the blade angle needs to be changed, without requiring the transmission gear 311 to rotate one revolution. Therefore, the connecting rod 310 will not obstruct the crank connecting rod 313.

[0030] It should also be noted that the drive mechanism 32 includes a lifting frame 324, a drive motor 320 is installed on the top of the lifting frame 324, the output shaft of the drive motor 320 is fixedly connected to a drive wheel 321, a connecting belt 322 is movably connected to the outer surface of the drive wheel 321, a driven wheel 323 is movably connected to the inner wall of one end of the connecting belt 322, the driven wheel 323 is fixedly installed on the outer surface of the main adjusting gear 331, and the lifting frame 324 is fixedly installed on the outside of one of the side support plates 101.

[0031] Please see Figure 3 and Figure 7When adjusting the blade angle of the fan silencer, the drive motor 320 is started, causing its output shaft to rotate, which in turn drives the drive wheel 321 to rotate. Since the connecting belt 322 tightly wraps around both the drive wheel 321 and the driven wheel 323, the rotation of the drive wheel 321 will simultaneously drive the driven wheel 323 to rotate. The driven wheel 323 will also stop rotating synchronously with the drive wheel 321. The driven wheel 323 has the function of driving the main adjusting gear 331. The drive motor 320 is an A5882-45ZY type DC worm gear reducer motor, which has forward and reverse drive and power-off self-locking functions.

[0032] It should also be noted that the inner side of the outer surface of the main adjusting gear 331 is rotatably fitted with a positioning groove 330, which is fixedly installed on the outside of the side support plate 101. The main adjusting gear 331, driven gear 332, first synchronous gear 334, second synchronous gear 336, third synchronous gear 337 and fourth synchronous gear 339 have the same rotation speed and the same direction of rotation. The first connecting chain 333, second connecting chain 335 and third connecting chain 338 have the same running speed and the same running direction.

[0033] Please see Figure 7 and Figure 8 When the main adjusting gear 331 rotates simultaneously with the driven wheel 323, the main adjusting gear 331 can be limited by being embedded in the positioning groove 330, thus preventing it from leaving its original position during rotation and improving stability. Each chain is paired with two gears, which ensures that each gear rotates at the same speed and direction, and maintains tight meshing between the chain and the gears, preventing the gears from disengaging from the chain.

[0034] It should also be noted that a locking assembly 4 is fixedly installed on the outer surface of one of the side support plates 101 near the drive mechanism 32. The locking assembly 4 includes a reinforcing base 401, and a mounting base 402 is fixedly connected to the outer surface of the reinforcing base 401. An electric push rod 403 is provided on the outer surface of the mounting base 402. A locking plate 404 is fixedly connected to one end of the electric push rod 403. A locking friction surface 405 is provided on one side of the inner wall of the locking plate 404, and the locking friction surface 405 is inclined. It is used to generate friction with the outer surface of the drive wheel 321 to assist the drive wheel 321 in stopping.

[0035] Please see Figure 3 , Figure 7 and Figure 9When the device is not running, the drive motor 320 stops. To prevent the self-locking function of the drive motor 320 from failing, the drive wheel 321 needs to be locked by the locking assembly 4. The mounting base 402 is fixedly installed on the reinforcing base 401 so that when the electric push rod 403 drives the locking plate 404 to move left and right, it can just contact the surface of the drive wheel 321. Specifically, when the drive motor 320 is not running, the electric push rod 403 is started by the external control system, which extends it, thereby driving the locking plate 404 to move towards the drive wheel 321. The friction surface 405 is inclined, so it does not initially contact the drive wheel 321 and has no effect on the rotation of the drive wheel 321. However, as it moves with the electric push rod 403, the locking friction surface 405 gradually moves from contacting the surface of the drive wheel 321 to tightly adhering to the surface of the drive wheel 321. Due to the uneven texture of the locking friction surface 405 and the use of anti-slip rubber material, it can generate axial compression on the drive wheel 321 and improve the anti-slip friction, thereby preventing it from rotating when the fan vibrates during operation and having a locking effect. The electric push rod 403 adopts the LX600 high-speed electric push rod, with a telescopic speed ≥20mm / s, which can realize the rapid adjustment and reliable locking of the V-shaped blade angle.

[0036] The working principle of this device: Please refer to [link / reference]. Figures 1 to 9During operation, the outer protective assembly 1 provides support and installation protection. When adjusting the blade angle of the fan silencer, the drive motor 320 is started, causing its output shaft to drive the drive wheel 321 and driven wheel 323 to rotate. The driven wheel 323 will also stop rotating synchronously with the drive wheel 321. The drive mechanism 32 provides driving force, and under the connection of the first connecting chain 333, the second connecting chain 335, and the third connecting chain 338, the main adjusting gear 331, the driven gear 332, the first synchronous gear 334, the second synchronous gear 336, the third synchronous gear 337, and the fourth synchronous gear 339 rotate simultaneously, thus achieving the benefit of simultaneous blade angle adjustment. When the air volume is low and the noise is high, the blades are retracted; when the air volume is high and the noise is low, the blades are extended. The fan silencer is composed of a perforated galvanized frame 203, centrifugal glass wool 204, and a perforated galvanized plate 205. The two sets of blades are adjusted symmetrically when adjusting the angle. Each blade angle adjustment mechanism 33 adjusts a set of blades. At the same time, the driven gear 332, the third synchronous gear 337 and the fourth synchronous gear 339 drive the I-shaped rotating shaft 315 and the transmission gear 311 to rotate. The crank connecting rod 313 connects the two ends of the blades on both sides, thereby changing the angle of the blades. When the device is stopped, in order to prevent the self-locking function of the drive motor 320 from failing, the locking component 4 locks the drive wheel 321. When the drive motor 320 is not running, the electric push rod 403 drives the locking plate 404 to move towards the drive wheel 321. The inclined locking friction surface 405 gradually contacts the surface of the drive wheel 321 and then tightly adheres to the surface of the drive wheel 321, generating axial compression on the drive wheel 321 and increasing the anti-slip friction, thereby achieving a locking effect.

[0037] The wiring diagrams of the drive motor 320 and electric push rod 403 in this invention are common knowledge in the field, and their working principles are known technologies. The appropriate model is selected according to actual use. Therefore, the control method and wiring layout of the drive motor 320 and electric push rod 403 will not be explained in detail.

[0038] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fan silencer with adjustable blade angle, comprising an outer casing assembly (1), a blade assembly (2), and an adjustment assembly (3), wherein multiple blade assemblies (2) and adjustment assemblies (3) are provided, and the adjustment assembly (3) includes a blade deflection mechanism (31), a drive mechanism (32), and a blade angle adjustment mechanism (33), characterized in that: The blade assembly (2) includes two fixing sleeves (202), and the outer surfaces of the two fixing sleeves (202) are symmetrically fixed with perforated galvanized frames (203). The blade deflection mechanism (31) is used to change the included angle between the two perforated galvanized frames (203). The blade included angle adjustment mechanism (33) includes a main adjusting gear (331) and a driven gear (332). A first connecting chain (333) meshes between the outer surface of the main adjusting gear (331) and the outer surface of the driven gear (332). A first synchronous gear (334) is fixedly connected to the outer side of the driven gear (332). A second connecting chain (335) meshes with the outer surface of the first synchronous gear (334). A second synchronous gear (336) meshes with the inner wall of the second connecting chain (335). A third synchronous gear (337) is fixedly connected to the inner side of the second synchronous gear (336). A third connecting chain (338) meshes with the outer surface of the third synchronous gear (337). A fourth synchronous gear (339) meshes with the inner wall of the third connecting chain (338).

2. The fan silencer with adjustable blade angle according to claim 1, characterized in that: Centrifugal glass wool (204) is placed inside each of the perforated galvanized frames (203) and is used to absorb noise. A perforated galvanized plate (205) is snapped onto the top of each of the perforated galvanized frames (203). An installation rod (201) is fixedly installed inside each of the fixed sleeves (202), and the outer surfaces of the two fixed sleeves (202) are in contact with each other.

3. The fan silencer with adjustable blade angle according to claim 2, characterized in that: The outer protective assembly (1) includes two side support plates (101), a support base plate (102) is fixedly connected between the bottoms of the two side support plates (101), a support top plate (103) is fixedly connected between the tops of the two side support plates (101), a protective cover (104) is fixedly connected to the outer surface of the two side support plates (101) on the opposite side, and a protective plate (105) is fixedly connected to the inner walls on both sides of the two protective covers (104).

4. The fan silencer with adjustable blade angle according to claim 3, characterized in that: Multiple positioning frames (106) are embedded on the outer surfaces of the two side support plates (101), and two positioning holes are opened on the outer surface of each positioning frame (106). Two rotating holes (107) are opened on the outer surfaces of the two side support plates (101) below each positioning frame (106).

5. The fan silencer with adjustable blade angle according to claim 4, characterized in that: The outer walls at both ends of each mounting rod (201) are rotatably connected to the inner wall of each positioning hole, and the number of multiple blade assemblies (2) corresponds to the number of multiple blade angle adjustment mechanisms (33).

6. The fan silencer with adjustable blade angle according to claim 5, characterized in that: The blade deflection mechanism (31) includes two connecting rods (310), both ends of which are fixedly connected to transmission gears (311). The outer surfaces of every two adjacent transmission gears (311) are meshed together. The outer surface of each transmission gear (311) on the opposite side is fixedly connected to an I-shaped rotating shaft (315). The outer surface of each I-shaped rotating shaft (315) is rotatably connected to the inner wall of each rotating hole (107). The driven gear (332), the third synchronous gear (337), and the fourth synchronous gear (339) are fixedly installed on the I-shaped rotating shafts (315) at the corresponding positions.

7. The fan silencer with adjustable blade angle according to claim 6, characterized in that: Each of the transmission gears (311) has an eccentric shaft (312) fixedly connected to its outer surface near the edge. Each of the eccentric shafts (312) has a crank connecting rod (313) rotatably connected to its outer surface. Each of the crank connecting rods (313) has a positioning connecting shaft (314) rotatably connected to one end. Each of the positioning connecting shafts (314) is fixedly installed at the bottom of both ends of the perforated galvanized frame (203) at the corresponding position.

8. The fan silencer with adjustable blade angle according to claim 7, characterized in that: The drive mechanism (32) includes a lifting frame (324), a drive motor (320) is provided on the top of the lifting frame (324), the output shaft of the drive motor (320) is fixedly connected to a drive wheel (321), a connecting belt (322) is movably connected to the outer surface of the drive wheel (321), a driven wheel (323) is movably connected to the inner wall of one end of the connecting belt (322), the driven wheel (323) is fixedly installed on the outer surface of the main adjusting gear (331), and the lifting frame (324) is fixedly installed on the outside of one of the side support plates (101).

9. The fan silencer with adjustable blade angle according to claim 8, characterized in that: The inner side of the main adjusting gear (331) is rotatably fitted with a positioning groove (330). The positioning groove (330) is fixedly installed on the outside of the side support plate (101). The main adjusting gear (331), driven gear (332), first synchronous gear (334), second synchronous gear (336), third synchronous gear (337) and fourth synchronous gear (339) have the same rotation speed and the same direction of rotation. The first connecting chain (333), second connecting chain (335) and third connecting chain (338) have the same running speed and the same running direction.

10. The fan silencer with adjustable blade angle according to claim 9, characterized in that: A locking assembly (4) is fixedly installed on the outer surface of one of the side support plates (101) near the drive mechanism (32). The locking assembly (4) includes a reinforcing base (401). A mounting seat (402) is fixedly connected to the outer surface of the reinforcing base (401). An electric push rod (403) is provided on the outer surface of the mounting seat (402). A locking plate (404) is fixedly connected to one end of the electric push rod (403). A locking friction surface (405) is provided on one side of the inner wall of the locking plate (404). The locking friction surface (405) is inclined and is used to generate friction with the outer surface of the drive wheel (321) to assist the drive wheel (321) in stopping.

Images