Dynamically adjustable centrifugal fan

Abstract

The invention discloses a dynamic adjustable centrifugal fan, and relates to the technical field of centrifugal fans, the dynamic adjustable centrifugal fan comprises a mounting frame, a rotary adjusting disc is arranged in the middle of the mounting frame, a plurality of connecting rods are fixedly arranged on the outer side of the rotary adjusting disc at equal intervals, and impellers are rotatably arranged at the outer ends of the connecting rods; the outer ends of the impellers are rotationally connected to the inner side of the mounting frame; and an adjusting shaft is arranged at the front part of the rotary adjusting disc. Through a cooperative transmission structure of the rotary adjusting disc, the adjusting shaft, the connecting rod, the first connecting unit and the second connecting unit, precise switching of the impeller beta b2 at the outlet angle of the impeller in the backward direction, the radial direction and the forward direction is achieved, and meanwhile the pressure adaptability under different working conditions is improved; by rotating the four-connecting-rod adjusting structure impeller composed of the adjusting disc, the connecting rod and the second connecting unit, the change trend of the theoretical power NT of the centrifugal fan can be controlled in a targeted mode, and the problem that when a traditional forward impeller works, motor overload is prone to being caused by sharp power rising is effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of centrifugal fan, in particular to a dynamic adjustable centrifugal fan. BACKGROUND

[0002] In the technical field of centrifugal fan, centrifugal fan is a kind of fluid machinery that can complete the conversion of kinetic energy and static pressure energy of gas inside the impeller by rotating the impeller to generate centrifugal force, and then realize gas delivery, pressurization or supercharging; Its core function is to transmit mechanical energy to gas by high-speed rotation of the impeller to meet the demand for gas flow speed and pressure in different scenarios, and is widely used in industrial and civil fields: in industrial scenarios, it is commonly used in cement plant dust removal system, boiler induced draft / fan system, chemical plant gas delivery system, etc., and undertakes the tasks of dust collection, combustion air supply, process gas transfer, etc.; In civil scenarios, it can be used for subway tunnel ventilation, high-rise building ventilation, commercial complex air conditioning air supply system, etc., to ensure air circulation and environmental comfort in space.

[0003] In the prior art, when the centrifugal fan needs to be dynamically adjusted to adapt to different working conditions, the traditional method is usually to adjust the fan performance by frequency conversion speed regulation and changing the speed of the impeller. 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, and it is difficult to cover the full working condition requirements from low flow high pressure to high flow low pressure, and it cannot meet the performance requirements in extreme working conditions. On the other hand, speed adjustment will directly affect the energy efficiency, operating noise and aerodynamic characteristics of the fan. When the speed increases, the energy consumption of the fan increases in a cubic relationship, and the energy efficiency decreases significantly. Frequent fluctuations in speed can easily cause unstable impact between the impeller and the airflow, and increase operating noise. At the same time, speed changes will destroy the adaptive aerodynamic state of the impeller and the airflow, causing vortex, separation and other losses in the impeller flow passage, and deteriorating the aerodynamic characteristics, further reducing the stability and reliability of the fan operation. Therefore, a dynamic adjustable centrifugal fan needs to be designed to solve the above problems. SUMMARY

[0004] To achieve the above purpose, the present application realizes the following technical scheme: a dynamic adjustable centrifugal fan, comprising a mounting frame, a rotating adjustment disc is arranged 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 disc, an impeller is rotatably arranged 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 arranged on the front of the rotating adjustment disc. The rotating adjustment disc is fixedly connected to the inner end of each connecting rod through a first connecting unit. The outer end of each connecting rod is rotatably connected to the inner end of each impeller through a second connecting unit. The outer ends of the plurality of impellers are rotatably connected to the inner side of the mounting frame through second connecting units. The rear part of the mounting frame is equidistantly provided with a plurality of connecting columns, the middle part of the connecting column is fixedly connected with a fixing disc, and the rear part of the fixing disc is fixedly connected with a motor rotating shaft.

[0005] Preferably, the first connecting unit comprises a first connecting piece, the outer side of the first connecting piece is provided with a first outer thread, the front end of the first connecting piece is fixedly provided with a locking column, the outer side of the locking column is provided with a second outer thread, and the outer side of the second outer thread is threadedly connected with a first locking nut.

[0006] Preferably, the upper and lower ends of the connecting rod are provided with third connecting holes; The outer side of the rotating adjusting disc is equidistantly provided with a plurality of second connecting holes, and the inner part of the second connecting hole is provided with an inner thread; The locking column provided on the front side of the first connecting piece penetrates through the second connecting hole and the third connecting hole at the lower part, and the first outer thread provided on the outer side of the first connecting piece is threadedly connected with the inner thread provided in the second connecting hole.

[0007] Preferably, the second connecting unit comprises a second connecting piece, the middle part of the second connecting piece is provided with a third outer thread, the outer side of the third outer thread is threadedly connected with a second locking nut, and the front and rear ends of the second connecting piece are threadedly connected with fixing bolts.

[0008] Preferably, the upper and lower parts of the impeller are provided with anti-collision grooves, and the front and rear ends of the upper and lower parts of the impeller are provided with side ears. The inner side of the mounting frame is equidistantly fixedly provided with a plurality of connecting blocks, the middle part of the connecting block is provided with a first connecting hole; the second connecting piece at the lower part penetrates through the third connecting hole at the upper part and is fixedly connected with the side ears at the front and rear sides of the upper part through fixing bolts, and the second connecting piece at the upper part penetrates through the first connecting hole and is fixedly connected with the side ears at the front and rear sides of the upper part through fixing bolts.

[0009] Preferably, the rear part of the fixing disc is provided with a sleeve, the sleeve is sleeved on the outer side of the motor rotating shaft, the front and rear parts of the sleeve are provided with fixing studs, and the two ends of the fixing stud are threadedly provided with third locking nuts.

[0010] Preferably, the middle part of the rotating adjusting disc is provided with an embedded groove, the rear end of the adjusting shaft is provided with a clamping block, and the clamping block is clamped and connected with the embedded groove.

[0011] In summary, the application provides a dynamic adjustable centrifugal fan, which has the following beneficial effects: 1. By the cooperative transmission structure of the rotating adjustment disc, the adjustment shaft, the connecting rod and the first and second connecting units, the adjustment shaft drives the rotating adjustment disc to rotate through the clamping block, the rotating adjustment disc drives the connecting rod to swing through the first connecting unit, and the connecting rod drives the impeller to rotate around the inside connecting block of the mounting frame through the second connecting unit, so as to realize the accurate switching of the impeller outlet angle impeller βb2 among the rearward, radial and forward directions; the adjustment can form a linear relationship between the theoretical total pressure PT∞ of the centrifugal fan and the actual flow rate Qr, the forward impeller βb2 can provide the highest pressure to meet the demand of small flow rate and high pressure air supply, the radial impeller βb2 can keep the pressure stable to adapt to the flow rate fluctuation scene, and the rearward impeller βb2 can adapt to the large flow rate and low pressure working condition, so as to realize the pressure adjustment with a wider coverage range, without changing the rotating speed, avoiding the energy loss and the disorder of aerodynamic characteristics caused by the frequency conversion speed regulation, and improving the pressure adaptability under different working conditions through the impeller angle adjustment.

[0012] 2. The four-bar linkage adjustment structure impeller is composed of the rotating adjustment disc, the connecting rod and the second connecting unit, the connecting rod is changed in angle by the rotating adjustment disc of the impeller, the second connecting unit is hinged with the impeller through the side lug, the stability and accuracy of the impeller βb2 adjustment are ensured, and the switching of the impeller among different βb2 types is realized; the adjustment can control the change trend of the theoretical power NT of the centrifugal fan, when switched to the rearward impeller, the power grows gently with the flow rate, effectively avoiding the motor overload problem caused by the sharp increase of the power when the traditional forward impeller works, when switched to the radial impeller, the power changes linearly and stably, and adapts to the medium power demand scene; compared with the traditional variable frequency speed regulation impeller, the structure adjustment does not need to rely on the frequency converter to change the rotating speed, can select the optimal impeller βb2, reduce the electric energy loss, avoid the noise superposition caused by the rotating speed adjustment, and take into account the power adaptability and operation economy. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a front view of the dynamic adjustable centrifugal fan; Figure 2 It is a front side perspective structural schematic view of the dynamic adjustable centrifugal fan; Figure 3 It is a rear side perspective structural schematic view of the dynamic adjustable centrifugal fan; Figure 4 It is a structural schematic view of the rotating adjustment disc, the connecting rod and the first connecting unit of the dynamic adjustable centrifugal fan; Figure 5 It is a structural schematic view of the connecting rod, the impeller and the second connecting unit of the dynamic adjustable centrifugal fan; Figure 6It is a mounting rack and fixed disc structure schematic diagram of the dynamic adjustable centrifugal fan of the application; Figure 7 It is a impeller outlet speed triangle structure schematic diagram of the dynamic adjustable centrifugal fan of the application; Figure 8 It is a PT∞ and Qr linear relationship structure schematic diagram of the dynamic adjustable centrifugal fan of the application; Figure 9 It is a NT and Qr linear relationship structure schematic diagram of the dynamic adjustable centrifugal fan of the application; Figure 10 It is a βb2<90° structure schematic diagram of the dynamic adjustable centrifugal fan of the application; Figure 11 It is a βb2=90° structure schematic diagram of the dynamic adjustable centrifugal fan of the application; Figure 12 It is a βb2>90° structure schematic diagram of the dynamic adjustable centrifugal fan of the application Mark explanation: 1, mounting rack; 101, connecting block; 102, first connecting hole; 2, rotating adjusting disc; 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 ear; 5, first connecting unit; 501, first connecting piece; 502, first external thread; 503, locking column; 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 column; 8, fixed disc; 801, sleeve; 802, fixing stud; 803, third locking nut; 9, motor rotating shaft; 10, adjusting shaft; 1001, clamping block. Specific implementation

[0014] The following will be combined with the attached Figure 1 -attached Figure 12 , make further detailed description of the application.

[0015] Example one: Please refer to Figures 1-6 , the application provides a technical scheme: a dynamic adjustable centrifugal fan, the middle part of the mounting rack 1 is provided with a rotating adjusting disc 2, the outer side of the rotating adjusting disc 2 is equidistantly fixedly provided with a plurality of connecting rods 3, the outer end of the connecting rod 3 is rotatably provided with an impeller 4, and the outer end of the impeller 4 is rotatably connected to the inner side of the mounting rack 1; The front part of the rotating adjusting disc 2 is provided with an adjusting shaft 10; The rotating adjusting disc 2 is fixedly connected with the inner end of the plurality of connecting rods 3 through the first connecting unit 5; The outer ends of the plurality of connecting rods 3 are rotatably connected to the inner ends of the plurality of impellers 4 through the second connecting units 6; The outer ends of the plurality of impellers 4 are rotatably connected to the inner side of the mounting frame 1 through the second connecting units 6; The rear part of the mounting frame 1 is equidistantly provided with a plurality of connecting columns 7, the middle part of the connecting column 7 is fixedly connected with a fixed disc 8, and the rear part of the fixed disc 8 is fixedly connected with a motor rotating shaft 9.

[0016] The first connecting unit 5 includes a first connecting piece 501, the outer side of the first connecting piece 501 is provided with a first outer thread 502, the front end of the first connecting piece 501 is fixedly provided with a locking column 503, the outer side of the locking column 503 is provided with a second outer thread 504, the outer side of the second outer thread 504 is threadedly connected with a first locking nut 505, the first connecting unit 5 adopts a double fixing structure of thread connection mixed with the second fastening of the first locking nut 505, which not only ensures the rigidity of the connection between the first connecting piece 501 and the rotating adjusting disc 2 and the connecting rod 3, but also eliminates the thread gap through the pre-tightening of the first locking nut 505, thereby avoiding the defects of easy thread slipping and low transmission accuracy of single thread connection during adjustment.

[0017] The upper and lower ends of the connecting rod 3 are provided with third connecting holes 301, which provide a space for the first connecting unit 5 and the second connecting unit 6 to pass through and connect, so that the connecting rod 3 becomes a transmission hub between the rotating adjusting disc 2 and the impeller 4, ensuring that the rotation of the rotating adjusting disc 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 problem of low transmission efficiency due to the lack of adaptive connection structure between the connecting rod 3 and other components; The outer side of the rotating adjusting disc 2 is equidistantly provided with a plurality of second connecting holes 201, the inner part of the second connecting hole 201 is provided with an inner thread 202, and the rotating adjusting disc 2 is connected to the connecting rod 3 through the equidistant second connecting holes 201 with the inner thread 202, so that the connection point of the connecting rod 3 and the rotating adjusting disc 2 can be flexibly selected, the initial installation angle of the impeller 4 is adjusted, the basis for multi-position adjustment of βb2 is provided, and the limitations of fixed connection point of the rotating disc and limited adjustment range are avoided; The locking column 503 provided on the front side of the first connecting piece 501 passes through the second connecting hole 201 and the lower third connecting hole 301, and the first outer thread 502 provided on the outer side of the first connecting piece 501 is threadedly connected with the inner thread 202 provided in the inner part of the second connecting hole 201, so that the first connecting unit 5 enables the first connecting piece 501 to simultaneously realize the thread connection between the rotating adjusting disc 2 and the connecting rod 3, and the penetrating cooperation between the connecting rod 3 and the locking column 503, so that the rotation of the rotating adjusting disc 2 stably drives the connecting rod 3 to swing, ensuring the transmission synchronization and stability, avoiding the adjustment error caused by the relative sliding of the components, and solving the problem of inaccurate transmission when multiple components are linked.

[0018] The second connecting unit 6 comprises a second connecting piece 601, the middle part of the second connecting piece 601 is provided with a third external thread 602, the outer side of the third external thread 602 is threadedly connected with a second locking nut 603, the front and rear ends of the second connecting piece 601 are threadedly connected 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 end fixing bolts 604 realize detachable connection with the side ears 402 of the impeller 4, which not only ensures the rotation flexibility of the impeller 4 during adjustment, but also limits displacement in a non-adjustment direction through the second locking nut 603, so that the impeller 4 only adjusts along the designed track to solve the problems of easy shaking and out-of-control adjustment track after the impeller 4 is connected.

[0019] The upper and lower parts of the impeller 4 are provided with anti-collision grooves 401, and the upper and lower parts of the impeller 4 are provided with side ears 402 at the front and rear ends, the anti-collision grooves 401 of the impeller 4 provide a safe avoidance space for adjustment to avoid collision and damage with other components, and the side ears 402 provide connection points for the second connecting unit 6, so that the impeller 4, the connecting rod 3 and the connecting block 101 form a hinged rotating structure to ensure the smoothness of rotation during adjustment of βb2, and solve the problems of easy collision and no adaptive rotating connection structure during adjustment of the impeller 4. The inner side of the mounting frame 1 is equidistantly fixed with a plurality of connecting blocks 101, the middle part of the connecting block 101 is provided with a first connecting hole 102, the connecting block 101 of the mounting frame 1 provides a connecting fulcrum for the second connecting unit 6 and the mounting frame 1, so that the upper end of the impeller 4 is hinged to the connecting block 101, and the lower end of the impeller 4 is hinged to the connecting rod 3 to form an upper and lower double-hinged four-bar linkage adjustment mechanism, so that the movement track of the impeller 4 during adjustment is more controllable, the accuracy of adjustment of βb2 is ensured, and the problems of no stable connecting fulcrum at the upper end of the impeller 4 and chaotic adjustment track are solved. The lower second connecting piece 601 passes through the upper third connecting hole 301 and is fixedly connected with the lower front and rear side ears 402 through the fixing bolts 604, and the upper second connecting piece 601 passes through the first connecting hole 102 and is fixedly connected with the upper front and rear side ears 402 through the fixing bolts 604, so that the upper and lower ends of the impeller 4 form a detachable hinged structure with the connecting rod 3 and the connecting block 101, which not only realizes flexible rotation of the impeller 4 during adjustment, but also facilitates quick disassembly and assembly during maintenance, and the structural strength during rotation is ensured through the connection of the fixing bolts 604, so that the problems of difficult hinging and complicated disassembly and assembly of the impeller 4 and other components are solved.

[0020] The rear part of the fixing disc 8 is provided with a sleeve 801 sleeved on the outside of the motor rotating shaft 9, the front and rear parts of the sleeve 801 are provided with fixing studs 802, the two ends of the fixing studs 802 are threadedly provided with third locking nuts 803, the fixing disc 8 is sleeved on the motor rotating shaft 9 through the sleeve 801, the sleeve 801 is clamped and fixed from the front and rear by the fixing studs 802 and the third locking nuts 803, the quick assembly and positioning of the fixing disc 8 and the motor rotating shaft 9 are realized, the coaxiality of the fan impeller 4 and the motor is ensured, different motor models are conveniently adapted, and the problems of poor coaxiality and low adaptability of the fan and the motor are solved.

[0021] The middle part of the rotating adjusting disc 2 is provided with an embedded groove 203, the rear end of the adjusting shaft 10 is provided with a clamping block 1001, the clamping block 1001 is clamped and connected with the embedded groove 203, the adjusting shaft 10 and the rotating adjusting disc 2 form a rigid transmission pair through the clamping block 1001 and the embedded groove 203, the rotation of the adjusting shaft 10 can be directly and losslessly transmitted to the rotating adjusting disc 2, the efficient transmission of the adjusting torque is ensured, the problems of easy wear and tear and large transmission gap of the connection are avoided, and the response accuracy and service life of the βb2 adjustment are improved.

[0022] Embodiment two: Please refer to Figures 7-12 The embodiment provides another embodiment of the application: 1., to Figures 7-12 The nomenclature of the symbols is explained: 1.C2m: refers to the component of the absolute velocity of the gas at the outlet section of the centrifugal fan impeller in the meridian plane, and the unit is m / s; 2.ω2∞: refers to the component of the relative velocity of the gas at the outlet of the centrifugal fan impeller in the circumferential tangent direction, and the unit is m / s; 3.βb2: refers to the angle between the tangent direction of the outlet end of the centrifugal fan impeller and the circumferential tangent direction of the impeller, and the unit is °; 4.C2∞: refers to the absolute velocity of the gas at the outlet section of the centrifugal fan impeller, and the unit is m / s; 5.u2: refers to the circumferential velocity at the outlet of the centrifugal fan impeller, and the unit is m / s; 6.C2u∞: refers to the component of the absolute velocity of the gas at the outlet section of the centrifugal fan impeller in the circumferential tangent direction, and the unit is usually m / s; 7.PT∞: refers to the theoretical total pressure of the centrifugal fan, that is, the pressure value corresponding to the work done by the impeller on unit mass of gas without considering the flow loss of the gas, and the unit is Pa; 8.Qr: refers to the actual flow rate of the centrifugal fan, and the unit is m 3 / s or m 3 / h; 9. NT: refers to the theoretical power of the centrifugal fan, that is, the power required to drive the fan impeller to rotate without considering mechanical loss and flow loss, unit is W or kW; 10. Is the key combination of fluid mechanics analysis of centrifugal fan, ρ represents the gas density, unit is kg / m 3 .

[0023] 2, βb2 on the pressure of centrifugal fan: Please refer to Figure 7 The impeller outlet velocity triangle is shown, we get: C 2u∞ = μ2-C 2m cotβ b2 P T∞ = ρu2(u2-C 2m cotβ b2 ) The meridian initial velocity of centrifugal fan outlet is generally radial, so the theoretical flow rate of centrifugal fan is: Where D2 is the diameter of the impeller, b2 is the width of the blade passage outlet; Please refer to Figure 8 , under the condition of the size and speed of centrifugal fan, PT∞ and Qr are linearly related, when βb2 = 90°, that is, when the radial impeller, tanβb2 = ∞; The pressure line is a straight line through the point On the longitudinal coordinate axis parallel to the horizontal coordinate axis, PT∞ does not change with Qr; When PT∞ < 90°, that is, when the backward impeller, tanβb2 is positive, PT∞ decreases with the increase of Qr, and the pressure line is inclined downward through the same point on the coordinate axis; When PT∞ > 90°, that is, when the forward impeller, tanβb2 is negative, PT∞ increases with the increase of Qr, and the pressure line is inclined upward through the same point on the coordinate axis; At the same flow rate, the pressure of forward centrifugal fan is the highest, the pressure of radial centrifugal fan is the second, and the pressure of backward centrifugal fan is the lowest. The impeller 4 can be adjusted by the rotating adjusting disc 2, the connecting rod 3 and the mounting frame 1, so that the impeller can be converted between forward, radial and backward, and the pressure of centrifugal fan at the same flow rate can be adjusted.

[0024] 1. βb2 on the power of centrifugal fan: The theoretical power of centrifugal fan is N T = P T∞ Q r According to the above formula can be obtained As shown in Figures 9-12 When βb2=90°, is zero, the power line is a straight line through the coordinate origin, when βb2>90° or βb2<90°, the power line is an upward or downward parabola; It can be seen that when the flow of the centrifugal fan increases, the forward power increases sharply, and the backward power increases slowly. The backward power increases slowly, and the impeller 4 can be adjusted by the rotating adjustment disc 2, the connecting rod 3 and the mounting frame 1 to switch between forward, radial and backward directions. The power of the centrifugal fan at the same flow is adjusted to prevent overloading and burnout of the motor during forward operation.

[0025] Example three: The working principle of the above embodiment is as follows: First, the clamping block 1001 of the adjusting shaft 10 is precisely engaged with the embedded groove 203 of the rotating adjustment disc 2 to form a rigid transmission connection. When the adjusting shaft 10 is rotated, the rotating adjustment disc 2 is synchronously rotated. The circular motion of the rotating adjustment disc 2 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 double-shaft linkage adjustment. The bottom end is rotated around the upper end of the connecting rod 3 through the second connecting unit 6, and the upper end is rotated in the connecting block 101 inside the mounting frame 1 through another set of second connecting units 6. A spatial four-bar linkage adjustment mechanism is formed to realize the continuous switching of the outlet angle βb2 of the impeller 4 between the backward direction βb2<90°, the radial direction βb2=90° and the forward direction βb2>90°. Then, the first outer thread 502 of the first connecting unit 5 is matched with the locking column 503 to finely adjust the swing amplitude of the connecting rod 3, and the quantitative control of βb2 is realized in combination with the scale mark. When the impeller 4 is passively adjusted by the air flow reaction force, the locking function of the first connecting unit 5 offsets the air flow impact through the mechanical pre-tightening force to ensure that the impeller 4 works stably at the set angle and avoids angle drift caused by working condition fluctuations. At the same time, the anti-collision groove 401 at 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 frame 1 and the connecting rod 3 during the adjustment process. Secondly, the standardized interface of the first connecting unit 5 and the second connecting unit 6 realizes quick maintenance. The first connecting unit 5 adopts a threaded detachable structure, and the connecting rod 3 and the rotating adjustment disc 2 can be separated by unscrewing the first locking nut 505. The side lug 402 of the second connecting unit 6 is matched with the second connecting piece 601 to realize the quick separation of the impeller, the connecting rod and the mounting frame through the plug-in pin shaft, so that the replacement time of the rotating adjustment disc 2, the connecting rod 3 and the impeller 4 is shortened. Finally, the fan performance is adapted to all working conditions through accurate adjustment of βb2. When adjusted to the backward impeller 4βb2<90°, the reaction degree Ω is maximum, the flow passage resistance loss is minimum, the fan efficiency is improved, and it is suitable for high-power energy-saving scenarios; when switched to the forward impeller 4βb2>90°, the theoretical total pressure is significantly improved according to the formula P T∞ =ρu2(u2-C 2m cotβ b2 ), which meets the medium and small power high pressure demand; the radial impeller 4βb2=90° keeps the pressure stable output, adapts to the ventilation system with small flow fluctuation, and finally realizes the technical target of one-key adjustment and all-working-condition response through accurate matching of mechanical structure and fluid mechanics characteristics.

[0026] The embodiments of the specific embodiment are the preferred embodiments of the application, not to limit the protection scope of the application, wherein the same parts are indicated by the same reference signs. Therefore: any equivalent changes made according to the structure, shape, principle of the application should be covered within the protection scope of the 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).

2. The dynamically adjustable centrifugal fan according to claim 1, characterized in that: Each of the first connecting units (5) includes a first connecting member (501), and the outer side of the first connecting member (501) is provided with a first external thread (502). The front end of the first connecting member (501) is fixedly provided with a locking post (503). The outer side of the locking post (503) is provided with a second external thread (504). The outer side of the second external thread (504) is threaded with a first locking nut (505).

3. The dynamically adjustable centrifugal fan according to claim 2, characterized in that: 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). 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).

4. A dynamically adjustable centrifugal fan according to claim 3, characterized in that: 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).

5. A dynamically adjustable centrifugal fan according to claim 4, characterized in that: 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).

6. A 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).

7. A 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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