A dynamically adjustable centrifugal fan

Abstract

This invention discloses a dynamically adjustable centrifugal fan, relating to the field of centrifugal fan technology. It includes a mounting frame with a rotating adjustment disc at its center. Several connecting rods are fixedly arranged at equal intervals on the outer side of the rotating adjustment disc. An impeller is rotatably mounted on the outer end of each connecting rod, and the outer end of each impeller is rotatably connected to the inner side of the mounting frame. An adjustment shaft is located at the front of the rotating adjustment disc. This invention achieves precise switching of the impeller outlet angle βb2 between backward, radial, and forward directions through a coordinated transmission structure of the rotating adjustment disc, adjustment shaft, connecting rods, and a first and second connecting unit, while simultaneously improving pressure adaptability under different operating conditions. The four-bar linkage adjustment structure of the impeller, formed by the rotating adjustment disc, connecting rods, and the second connecting unit, can specifically control the variation trend of the centrifugal fan's theoretical power NT, effectively avoiding the motor overload problem caused by a sharp increase in power during the operation of traditional forward impellers.

Description

Technical Field

[0001] This invention relates to the field of centrifugal fan technology, and in particular to a dynamically adjustable centrifugal fan. Background Technology

[0002] In the field of centrifugal fan technology, a centrifugal fan is a fluid machine that generates centrifugal force through impeller rotation, enabling the gas to convert kinetic energy into static pressure energy within the impeller, thereby achieving gas transport, pressurization, or boosting. Its core function is to transfer mechanical energy to the gas by relying on the high-speed rotation of the impeller, meeting the requirements for gas flow speed and pressure in different scenarios. It is widely used in industrial and civil fields: In industrial scenarios, it is often used in dust removal systems in cement plants, induced draft / supply draft systems in boilers, and gas transport systems in chemical workshops, undertaking tasks such as dust collection, combustion ventilation, and process gas transfer; In civil scenarios, it can be used for subway tunnel ventilation, ventilation and air exchange in high-rise buildings, and air conditioning systems in commercial complexes, ensuring air circulation and environmental comfort within the space.

[0003] In existing technologies, when centrifugal fans need to be dynamically adjusted to adapt to different operating conditions, the traditional approach is to adjust the fan performance by changing the impeller speed through frequency conversion speed regulation. However, this adjustment method has significant limitations. On the one hand, the speed regulation range is limited by the rated speed of the motor and the power of the frequency converter, making it difficult to cover the full range of operating conditions from low flow and high pressure to high flow and low pressure, and failing to meet the performance requirements under extreme conditions. On the other hand, speed adjustment directly affects the fan's energy efficiency, operating noise, and aerodynamic characteristics. As the speed increases, the fan's energy consumption increases cubically, and energy efficiency decreases significantly. Frequent speed fluctuations can easily lead to unstable impacts between the impeller and the airflow, exacerbating operating noise. At the same time, speed changes can disrupt the aerodynamic fit between the impeller and the airflow, causing losses such as vortices and separation in the impeller channel, deteriorating aerodynamic characteristics, and further reducing the fan's operational stability and reliability. Therefore, a dynamically adjustable centrifugal fan needs to be designed to solve the problems mentioned above. Summary of the Invention

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution: a dynamically adjustable centrifugal fan, including a mounting frame, a rotating adjustment disk is provided in the middle of the mounting frame, a plurality of connecting rods are fixedly arranged at equal intervals on the outer side of the rotating adjustment disk, an impeller is rotatably provided at the outer end of each connecting rod, and the outer end of each impeller is rotatably connected to the inner side of the mounting frame. An adjustment shaft is provided at the front of the rotary adjustment disk; The rotary adjustment disk is fixedly connected to the inner end of several connecting rods via a first connecting unit; The outermost ends of several connecting rods are rotatably connected to the innermost ends of several impellers via a second connecting unit; The outermost ends of several impellers are rotatably connected to the inner side of the mounting frame via a second connecting unit; The mounting bracket has several connecting posts equidistantly arranged at the rear. A fixing plate is fixedly connected to the middle of each connecting post, and a motor shaft is fixedly connected to the rear of the fixing plate.

[0005] Preferably, each of the first connecting units includes a first connecting member, the outer side of each first connecting member is provided with a first external thread, the front end of each first connecting member is fixedly provided with a locking post, the outer side of each locking post is provided with a second external thread, and the outer side of each second external thread is threadedly connected with a first locking nut.

[0006] Preferably, a third connecting hole is provided at both the upper and lower ends of the connecting rod; The outer side of the rotary adjustment disk is provided with a plurality of second connecting holes at equal intervals, and the interior of each of the second connecting holes is provided with internal threads; The locking pins provided on the front side of the first connector all pass through the second connecting hole and the lower third connecting hole, and the first external thread provided on the outer side of the first connector is threadedly connected to the internal thread provided inside the second connecting hole.

[0007] Preferably, each of the second connecting units includes a second connecting member, and each of the second connecting members has a third external thread in the middle. A second locking nut is threaded to the outer side of the third external thread, and a fixing bolt is threaded to the front and rear ends of the second connecting member.

[0008] Preferably, the impeller is provided with anti-collision grooves at both the upper and lower parts, and the impeller is provided with side ears at both the front and rear ends of the upper and lower parts; The mounting bracket has several connecting blocks fixedly arranged at equal intervals on its inner side, and each connecting block has a first connecting hole in its center; the lower second connecting parts all pass through the upper third connecting hole and are fixedly connected to the lower front and rear side ears by fixing bolts, and the upper second connecting parts all pass through the first connecting hole and are fixedly connected to the upper front and rear side ears by fixing bolts.

[0009] Preferably, a sleeve is provided at the rear of the fixed plate, the sleeve is sleeved on the outside of the motor shaft, and a fixing stud is provided at both the front and rear of the sleeve, and a third locking nut is threaded at both ends of the fixing stud.

[0010] Preferably, the rotating adjustment disk has a fitting groove in the middle, and the adjustment shaft has a locking block at the rear end, the locking block engaging with the fitting groove.

[0011] In summary, the present invention provides a dynamically adjustable centrifugal fan, which has the following beneficial effects: 1. Through the coordinated transmission structure of the rotary adjustment disc, adjustment shaft, connecting rod, first connecting unit, and second connecting unit, the adjustment shaft drives the rotary adjustment disc to rotate via the locking block. The rotary adjustment disc drives the connecting rod to swing via the first connecting unit. The connecting rod then drives the impeller to rotate around the inner connecting block of the mounting frame via the second connecting unit, realizing the precise switching of the impeller outlet angle βb2 between backward, radial, and forward directions. This adjustment enables the centrifugal fan's theoretical total pressure PT∞ to form a suitable linear relationship with the actual flow rate Qr. The forward impeller βb2 can provide the highest pressure to meet the demand for low-flow, high-pressure air delivery. The radial impeller βb2 maintains stable pressure to adapt to flow fluctuation scenarios. The backward impeller βb2 adapts to high-flow, low-pressure operating conditions, achieving a wider range of pressure regulation without changing the rotation speed, avoiding energy loss and aerodynamic characteristic disturbances caused by frequency conversion speed regulation. At the same time, the impeller angle adjustment makes the characteristic of smaller air volume and higher static pressure when the impeller outlet angle is more vertical more accurate, improving the pressure adaptability under different operating conditions.

[0012] 2. The impeller features a four-bar linkage adjustment structure consisting of a rotating adjustment disc, a connecting rod, and a second connecting unit. The rotating adjustment disc drives the connecting rod to change its angle, and the second connecting unit is hinged to the impeller via a side lug, ensuring the stability and accuracy of the impeller's βb2 adjustment and enabling switching between different βb2 types. This adjustment can specifically control the change trend of the centrifugal fan's theoretical power NT. When switching to a backward impeller, the power increases gradually with flow rate, effectively avoiding the motor overload problem caused by a sharp increase in power during the operation of a traditional forward impeller. When switching to a radial impeller, the power changes linearly and stably, suitable for medium-power demand scenarios. Compared to the limitations of traditional variable frequency speed control impellers in terms of energy efficiency and noise reduction, this structure does not rely on a frequency converter to change the speed. By selecting the optimal impeller βb2, energy loss is reduced, while avoiding noise accumulation caused by speed adjustment, thus balancing power adaptability and operational economy. Attached Figure Description

[0013] Figure 1 This is a front view of a dynamically adjustable centrifugal fan according to the present invention; Figure 2 This is a schematic diagram of the front three-dimensional structure of a dynamically adjustable centrifugal fan according to the present invention; Figure 3 This is a schematic diagram of the rear three-dimensional structure of a dynamically adjustable centrifugal fan according to the present invention; Figure 4 This is a schematic diagram of the rotating adjustment disc, connecting rod, and first connecting unit structure of a dynamically adjustable centrifugal fan according to the present invention; Figure 5 This is a schematic diagram of the connecting rod, impeller, and second connecting unit structure of a dynamically adjustable centrifugal fan according to the present invention; Figure 6This is a schematic diagram of the mounting bracket and fixing plate structure of a dynamically adjustable centrifugal fan according to the present invention; Figure 7 This is a schematic diagram of the triangular structure of the impeller outlet velocity of a dynamically adjustable centrifugal fan according to the present invention; Figure 8 This is a schematic diagram of the linear relationship between PT∞ and Qr in a dynamically adjustable centrifugal fan according to the present invention; Figure 9 This is a schematic diagram of the linear relationship between NT and Qr in a dynamically adjustable centrifugal fan according to the present invention; Figure 10 This is a schematic diagram of the structure of a dynamically adjustable centrifugal fan with βb2 < 90° according to the present invention; Figure 11 This is a schematic diagram of the βb2=90° structure of a dynamically adjustable centrifugal fan according to the present invention; Figure 12 This is a schematic diagram of the βb2 > 90° structure of a dynamically adjustable centrifugal fan according to the present invention. Explanation of reference numerals in the attached figures: 1. Mounting bracket; 101. Connecting block; 102. First connecting hole; 2. Rotary adjusting plate; 201. Second connecting hole; 202. Internal thread; 203. Fitting groove; 3. Connecting rod; 301. Third connecting hole; 4. Impeller; 401. Anti-collision groove; 402. Side lug; 5. First connecting unit; 501. First connecting piece; 502. First external thread; 503. Locking post; 504. Second external thread; 505. First locking nut; 6. Second connecting unit; 601. Second connecting piece; 602. Third external thread; 603. Second locking nut; 604. Fixing bolt; 7. Connecting post; 8. Fixing plate; 801. Sleeve; 802. Fixing stud; 803. Third locking nut; 9. Motor shaft; 10. Adjusting shaft; 1001. Clamping block. Detailed Implementation

[0014] The following is in conjunction with the appendix Figure 1 - Appendix Figure 12 This application will be described in further detail below.

[0015] Example 1: Please see Figures 1-6 As shown, the present invention provides a technical solution: a dynamically adjustable centrifugal fan, wherein a rotating adjustment disk 2 is provided in the middle of the mounting frame 1, and a plurality of connecting rods 3 are fixedly arranged at equal intervals on the outer side of the rotating adjustment disk 2, and an impeller 4 is rotatably arranged on the outer end of each connecting rod 3, and the outer end of each impeller 4 is rotatably connected to the inner side of the mounting frame 1. An adjustment shaft 10 is provided at the front of the rotary adjustment disk 2; The rotary adjustment disk 2 is fixedly connected to the inner end of several connecting rods 3 through the first connecting unit 5; The outer ends of several connecting rods 3 are rotatably connected to the inner ends of several impellers 4 through the second connecting unit 6; The outermost ends of several impellers 4 are rotatably connected to the inner side of the mounting frame 1 via the second connecting unit 6; The mounting bracket 1 has several connecting posts 7 evenly spaced at the rear. A fixing plate 8 is fixedly connected to the middle of the connecting post 7, and a motor shaft 9 is fixedly connected to the rear of the fixing plate 8.

[0016] Each of the first connecting units 5 includes a first connecting member 501. The outer side of each first connecting member 501 is provided with a first external thread 502. The front end of each first connecting member 501 is fixedly provided with a locking post 503. The outer side of each locking post 503 is provided with a second external thread 504. The outer side of each second external thread 504 is threadedly connected with a first locking nut 505. The first connecting unit 5 adopts a double fixing structure of threaded connection and secondary tightening of the first locking nut 505. This ensures the rigidity of the connection between the first connecting member 501 and the rotating adjustment disk 2 and the connecting rod 3. At the same time, the thread gap is eliminated by the pre-tightening of the first locking nut 505, avoiding loosening due to vibration during adjustment and preventing the defects of easy stripping and low transmission accuracy of single thread connection.

[0017] The upper and lower ends of the connecting rod 3 are provided with a third connecting hole 301. The third connecting hole 301 provides a space for the first connecting unit 5 and the second connecting unit 6 to pass through, so that the connecting rod 3 becomes the transmission hub between the rotating adjusting disk 2 and the impeller 4, ensuring that the rotation of the rotating adjusting disk 2 can be effectively transmitted to the impeller 4, realizing the precise adjustment of the outlet angle βb2 of the impeller (4), and solving the problems of the connecting rod 3 having no matching connection structure with other components and low transmission efficiency. The outer side of the rotary adjustment disk 2 is provided with several second connecting holes 201 at equal intervals. The interior of each second connecting hole 201 is provided with an internal thread 202. The rotary adjustment disk 2 can flexibly select the connection point between the connecting rod 3 and the rotary adjustment disk 2 through the second connecting holes 201 with internal threads 202 at equal intervals, and fine adjust the initial installation angle of the impeller 4, providing a basis for the multi-level adjustment of βb2, and avoiding the limitations of fixed connection point of the rotary disk and limited adjustment range. The locking pins 503 on the front side of the first connector 501 all pass through the second connecting hole 201 and the lower third connecting hole 301. The first external thread 502 on the outside of the first connector 501 is threadedly connected to the internal thread 202 inside the second connecting hole 201. The first connecting unit 5 allows the first connector 501 to simultaneously achieve the threaded connection between the rotating adjustment disk 2 and the connecting rod 3, and the through-fitting of the connecting rod 3 and the locking pin 503. This ensures that the rotation of the rotating adjustment disk 2 stably drives the connecting rod 3 to swing, ensuring the synchronization and stability of the transmission, avoiding adjustment errors caused by relative sliding of components, and solving the problem of inaccurate transmission when multiple components are linked.

[0018] Each of the second connecting units 6 includes a second connecting member 601. The middle of each second connecting member 601 is provided with a third external thread 602. The outer side of the third external thread 602 is threaded with a second locking nut 603. The front and rear ends of each second connecting member 601 are threaded with fixing bolts 604. The second connecting unit 6 is axially fastened through the third external thread 602 and the second locking nut 603. The front and rear fixing bolts 604 are detachably connected to the side ears 402 of the impeller 4. This ensures the rotational flexibility of the impeller 4 during adjustment, and the second locking nut 603 locks and restricts the displacement in the non-adjustment direction, so that the impeller 4 can only be adjusted along the designed trajectory βb2. This solves the problem of the impeller 4 easily shaking and the uncontrolled adjustment trajectory after connection.

[0019] The impeller 4 is provided with anti-collision grooves 401 at both the top and bottom, and side ears 402 at both the front and rear ends of the top and bottom. The anti-collision grooves 401 of the impeller 4 provide safe clearance space for its adjustment and avoid collision damage with other components. The side ears 402 provide connection points for the second connecting unit 6, so that the impeller 4, connecting rod 3, and connecting block 101 form a hinged rotation structure, which ensures smooth rotation when βb2 is adjusted and solves the problems of easy collision during impeller 4 adjustment and lack of a suitable rotation connection structure. Several connecting blocks 101 are fixedly arranged at equal intervals on the inner side of the mounting frame 1. Each connecting block 101 has a first connecting hole 102 in the middle. The connecting blocks 101 of the mounting frame 1 provide a connection fulcrum for the second connecting unit 6 to the mounting frame 1, so that the upper end of the impeller 4 is hinged to the connecting block 101. Together with the hinge of the lower end of the impeller 4 to the connecting rod 3, a double-hinged four-bar linkage adjustment mechanism is formed, which makes the movement trajectory of the impeller 4 more controllable during adjustment, ensures the accuracy of βb2 adjustment, and solves the problem of no stable connection fulcrum at the upper end of the impeller 4 and chaotic adjustment trajectory. The lower second connecting parts 601 all pass through the upper third connecting hole 301 and are fixedly connected to the lower front and rear side ears 402 by fixing bolts 604. The upper second connecting parts 601 all pass through the first connecting hole 102 and are fixedly connected to the upper front and rear side ears 402 by fixing bolts 604. This makes the upper and lower ends of the impeller 4 form a detachable hinge structure with the connecting rod 3 and the connecting block 101 respectively. This not only enables the impeller 4 to rotate flexibly during adjustment, but also facilitates quick disassembly and assembly during maintenance. At the same time, the connection by fixing bolts 604 ensures the structural strength during rotation, solving the problems of difficult hinge connection and cumbersome disassembly and assembly of the impeller 4 with other components.

[0020] A sleeve 801 is provided at the rear of the fixed plate 8. The sleeve 801 is fitted on the outside of the motor shaft 9. Fixing studs 802 are provided at both the front and rear of the sleeve 801. A third locking nut 803 is threaded at both ends of the fixing studs 802. The fixed plate 8 fits the motor shaft 9 through the sleeve 801. The fixing studs 802 and the third locking nut 803 clamp the fixed sleeve 801 from the front and rear, realizing the quick assembly and positioning of the fixed plate 8 and the motor shaft 9. This ensures the coaxiality of the fan impeller 4 and the motor, and facilitates the adaptation to different motor models. It solves the problems of poor coaxiality and low compatibility between the fan and the motor.

[0021] The rotary adjustment disk 2 has a fitting groove 203 in the middle and a locking block 1001 at the rear end of the adjustment shaft 10. The locking block 1001 is engaged with the fitting groove 203. The adjustment shaft 10 and the rotary adjustment disk 2 form a rigid transmission pair through the locking block 1001 and the fitting groove 203. The rotation of the adjustment shaft 10 can be directly and losslessly transmitted to the rotary adjustment disk 2, ensuring the efficient transmission of adjustment torque, avoiding the problems of easy wear of the connection and large transmission clearance, and improving the response accuracy and service life of βb2 adjustment.

[0022] Example 2: Please see Figures 7-12 As shown, this embodiment is another embodiment provided by the present invention: 1. To Figures 7-12 In the text, the definitions of each symbol are as follows: 1. C2m: refers to the component of the absolute gas velocity in the meridional plane at the outlet section of the centrifugal fan impeller, with the unit being m / s; 2. ω2∞: The component of the relative velocity of the gas at the outlet of the centrifugal fan impeller along the circumferential tangential direction, in m / s; 3. βb2: Impeller outlet angle, which is the angle between the tangent direction at the outlet end of the centrifugal fan impeller and the tangent direction around the impeller circumference, in degrees; 4. C2∞: Absolute velocity of gas at the outlet section of the centrifugal fan impeller, in m / s; 5. u2: refers to the circumferential velocity at the outlet of the centrifugal fan impeller, in m / s; 6. C2u∞: The component of the absolute gas velocity in the circumferential tangential direction at the outlet section of the centrifugal fan impeller, usually expressed in m / s; 7. PT∞: refers to the theoretical total pressure of a centrifugal fan, that is, the pressure value corresponding to the work done by the impeller on a unit mass of gas without considering gas flow losses, and the unit is Pa; 8. Qr: refers to the actual flow rate of the centrifugal fan, in cubic meters per second (m³). 3 / s or m 3 / h; 9. NT: refers to the theoretical power of a centrifugal fan, which is the power required to drive the impeller to rotate without considering mechanical losses and flow losses. The unit is W or kW. 10. It is a key component in the hydrodynamic analysis of centrifugal fans, where ρ represents gas density in kg / m³. 3 .

[0023] 2. The effect of βb2 on centrifugal fan pressure: Please see Figure 7 From the impeller outlet velocity triangle shown, we get: C 2u∞ =μ2-C 2m cotβ b2 P T∞ =ρu2(u2-C 2m cotβ b2 ) The initial meridional velocity at the outlet of a centrifugal fan is generally radial; therefore, the theoretical flow rate of the centrifugal fan is: Where D2 is the impeller diameter and b2 is the width of the impeller outlet; Please see Figure 8 As shown, under the condition that the size and speed of the centrifugal fan are constant, it can be seen from the above formula that PT∞ and Qr have a linear relationship. When βb2=90°, that is, when it is a radial impeller, tanβb2=∞; The pressure line passes through points on the vertical axis. A straight line parallel to the horizontal axis, PT∞ does not change with Qr; When PT∞ < 90°, which is a backward impeller, tanβb2 is a positive value, PT∞ decreases as Qr increases, and the pressure line slopes downward through the same point on the coordinate axis. When PT∞ > 90°, which is a forward impeller, tanβb2 is negative. PT∞ increases with the increase of Qr, and the pressure line slopes upward through the same point on the coordinate axis. At the same flow rate, the forward centrifugal fan has the highest pressure, followed by the radial centrifugal fan, and the backward centrifugal fan has the lowest pressure. The impeller 4 can be adjusted by rotating the adjusting disc 2, the connecting rod 3, and the mounting bracket 1, so that the impeller can switch between forward, radial, and backward directions, thereby adjusting the pressure of the centrifugal fan at the same flow rate.

[0024] 1. The effect of βb2 on centrifugal fan power: The theoretical power of the centrifugal fan is N T =P T∞ Q r According to the above formula, we can obtain... like Figure 9-12 As shown, when βb2=90°, When βb2 is zero, the power line is a straight line passing through the origin of the coordinate axis. When βb2 > 90° or βb2 < 90°, the power line is an upward or downward parabola. It is known that when the flow rate of the centrifugal fan increases, the forward power increases sharply, while the backward power increases slowly. The impeller 4 can be adjusted by rotating the adjusting disc 2, the connecting rod 3, and the mounting bracket 1 to switch between forward, radial, and backward directions, thereby adjusting the power of the centrifugal fan at the same flow rate and preventing overload during forward operation, which could lead to motor burnout.

[0025] Example 3: This embodiment illustrates the working principle of the above embodiments: First, the locking block 1001 of the adjusting shaft 10 precisely engages with the fitting groove 203 of the rotating adjusting disk 2 to form a rigid transmission connection. When the adjusting shaft 10 is rotated, the rotating adjusting disk 2 rotates synchronously. Its circumferential motion is converted into the angular displacement of the connecting rod 3 through the first connecting unit 5. At this time, the impeller 4 forms a dual-axis linkage adjustment. The bottom end rotates around the upper end of the connecting rod 3 through the second connecting unit 6, and the upper end rotates in the connecting block 101 inside the mounting frame 1 through another set of second connecting units 6, forming a spatial four-bar linkage adjustment mechanism, realizing the continuous switching of the impeller 4 outlet angle βb2 between three types: backward βb2 < 90°, radial βb2 = 90°, and forward βb2 > 90°. Then, precise angle control is achieved through the threaded adjustment structure of the first connecting unit 5. Its first external thread 502 cooperates with the locking column 503 to make fine adjustments to the swing amplitude of the connecting rod 3. Combined with the scale markings, quantitative control of βb2 is achieved. When the impeller 4 is passively adjusted by the airflow reaction force, the locking function of the first connecting unit 5 offsets the airflow impact through mechanical pre-tightening force, ensuring that the impeller 4 works stably at the set angle and avoiding angle drift caused by working condition fluctuations. At the same time, the anti-collision groove 401 on the edge of the impeller 4 and the rigid support of the connecting block 101 form double protection to prevent the impeller 4 from colliding with the mounting bracket 1 and the connecting rod 3 during the adjustment process. Secondly, rapid maintenance is achieved through the standardized interfaces of the first connecting unit 5 and the second connecting unit 6. The first connecting unit 5 adopts a threaded detachable structure. Loosening the first locking nut 505 can separate the connecting rod 3 from the rotating adjustment plate 2. The side lug 402 of the second connecting unit 6 cooperates with the second connecting piece 601. The impeller is quickly separated from the connecting rod and the mounting bracket by inserting and removing the pin shaft, which shortens the replacement time of the rotating adjustment plate 2, connecting rod 3 and impeller 4. Finally, precise adjustment of βb2 achieves full-condition adaptation of the fan performance. When adjusted to a backward impeller with 4βb2 < 90°, the reaction degree Ω is maximized, the flow channel resistance loss is minimized, and the fan efficiency is improved, making it suitable for high-power energy-saving scenarios. When switching to a forward impeller with 4βb2 > 90°, the efficiency is improved through formula P. T∞ =ρu2(u2-C 2m cotβ b2 As can be seen, its theoretical total pressure is significantly improved, meeting the high pressure requirements of small and medium power; the radial impeller 4βb2=90° maintains stable pressure output, adapting to ventilation systems with small flow fluctuations. Through precise matching of mechanical structure and fluid dynamics characteristics, the technical goal of one-button adjustment and full-condition response is finally achieved.

[0026] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A dynamically adjustable centrifugal fan, comprising a mounting bracket (1), characterized in that: A rotating adjustment disk (2) is provided in the middle of the mounting frame (1). Several connecting rods (3) are fixedly arranged at equal intervals on the outer side of the rotating adjustment disk (2). An impeller (4) is rotatably provided on the outer end of each connecting rod (3). The outer end of each impeller (4) is rotatably connected to the inner side of the mounting frame (1). An adjustment shaft (10) is provided at the front of the rotary adjustment disk (2); The rotary adjustment disk (2) is fixedly connected to the inner end of several connecting rods (3) through the first connecting unit (5); The outer ends of several connecting rods (3) are rotatably connected to the inner ends of several impellers (4) through a second connecting unit (6); The outermost ends of several impellers (4) are rotatably connected to the inner side of the mounting frame (1) via a second connecting unit (6); The mounting bracket (1) has several connecting posts (7) evenly spaced at the rear. A fixing plate (8) is fixedly connected to the middle of the connecting post (7), and a motor shaft (9) is fixedly connected to the rear of the fixing plate (8). Each of the first connecting units (5) includes a first connecting member (501), and each of the first connecting members (501) has a first external thread (502) on its outer side. Each of the first connecting members (501) has a locking post (503) fixedly provided at its front end. Each of the locking posts (503) has a second external thread (504) on its outer side. Each of the second external threads (504) has a first locking nut (505) threadedly connected to its outer side. The upper and lower ends of the connecting rod (3) are provided with a third connecting hole (301). The outer side of the rotary adjustment disk (2) is provided with a plurality of second connecting holes (201) at equal intervals, and the interior of each of the second connecting holes (201) is provided with an internal thread (202). The locking pins (503) provided on the front side of the first connector (501) all pass through the second connecting hole (201) and the lower third connecting hole (301), and the first external thread (502) provided on the outside of the first connector (501) is threadedly connected to the internal thread (202) provided inside the second connecting hole (201); The second connecting unit (6) includes a second connecting member (601), and the middle part of the second connecting member (601) is provided with a third external thread (602). The outer side of the third external thread (602) is threaded with a second locking nut (603). The front and rear ends of the second connecting member (601) are threaded with fixing bolts (604). The impeller (4) is provided with anti-collision grooves (401) at both the upper and lower parts, and the impeller (4) is provided with side ears (402) at both the front and rear ends of the upper and lower parts. The mounting bracket (1) has several connecting blocks (101) fixedly arranged at equal intervals on its inner side, and each connecting block (101) has a first connecting hole (102) in the middle. The lower second connector (601) passes through the upper third connector (301) and is fixedly connected to the lower front and rear side ears (402) by fixing bolts (604). The upper second connector (601) passes through the first connector (102) and is fixedly connected to the upper front and rear side ears (402) by fixing bolts (604).

2. The dynamically adjustable centrifugal fan according to claim 1, characterized in that: The rear part of the fixed plate (8) is provided with a sleeve (801), which is sleeved on the outside of the motor shaft (9). The front and rear parts of the sleeve (801) are provided with fixing studs (802), and both ends of the fixing studs (802) are threaded with a third locking nut (803).

3. The dynamically adjustable centrifugal fan according to claim 1, characterized in that: The rotating adjustment disk (2) is provided with a fitting groove (203) in the middle, and the rear end of the adjustment shaft (10) is provided with a locking block (1001), which is engaged with the fitting groove (203).

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