CN114458618B

CN114458618B - Reversible multi-wing centrifugal fan impeller device with forward and backward adjustment and fan

Info

Publication number: CN114458618B
Application number: CN202210283348.0A
Authority: CN
Inventors: 刘小民; 王加浩; 田晨晔; 席光
Original assignee: Xian Jiaotong University
Current assignee: Xian Jiaotong University
Priority date: 2022-03-22
Filing date: 2022-03-22
Publication date: 2022-12-09
Anticipated expiration: 2042-03-22
Also published as: CN114458618A

Abstract

The invention discloses a reversible multi-wing centrifugal fan impeller device capable of forward and reverse adjustment and a fan, wherein an impeller rear disc and an impeller front disc are adopted, blades are rotatably arranged between the impeller rear disc and the impeller front disc, blade rotating gears are fixed at the end parts of the blades, which are rotatably connected with the impeller front disc, a fluted disc motor support is fixed on the impeller front disc, a fluted disc motor is fixed on the fluted disc motor support, a fluted disc flange is fixed on an output shaft of the fluted disc motor, a gear disc meshed with the blade rotating gears is fixed on the outer ring of the fluted disc flange, and the rotating angles of the blades are changed by utilizing the fluted disc motor, so that the consistency of the pneumatic performance of the fan during forward rotation and reverse rotation can be effectively ensured, the blades can be rotated to the optimal acting state, and the acting capacity is improved; the blade on the reversible multi-blade centrifugal fan is rotated through the structure to realize the switching of the forward and reverse rotating two fan impellers, and the structure is simple, safe and reliable, and the operation is stable.

Description

Reversible multi-wing centrifugal fan impeller device with forward and backward adjustment and fan

Technical Field

The invention belongs to the technical field of fluid machinery, and particularly relates to a reversible multi-wing centrifugal fan impeller device with forward and reverse adjustment and a fan.

Background

The bathroom heating and ventilating device is widely applied to small-space places such as toilets in families, and in order to adapt to the miniaturization development of the bathroom heating and ventilating device, a fan carried in the bathroom heating and ventilating device is gradually changed into a reversible multi-wing centrifugal fan from two one-way multi-wing centrifugal fans. However, the performance of the reversible multi-wing centrifugal fan is far lower than that of a one-way multi-wing centrifugal fan, and the requirements of heating and ventilation cannot be met, so that the pneumatic performance of the reversible multi-wing centrifugal fan is very necessary to be improved.

The reversible multi-wing centrifugal fan can directly drive the impeller through the forward rotation and the reverse rotation of the motor, and the forward rotation and the reverse rotation of the impeller are realized to realize the air outlet of different air ports. The fan structure is as shown in fig. 12, air is fed from the same inlet during forward rotation and reverse rotation, air flow is blown out from an upper outlet during forward rotation of the impeller, hot air is blown out by heating of the PTC heater for heating during bathing, and the outlet is called as an air blowing port; when the air flow is reversed, the air flow is blown out from an outlet at the lower part and directly blown to the outside for ventilation, and the outlet is called as a ventilation opening. Therefore, it is necessary for the impeller and the volute to ensure both the forward rotation and the reverse rotation of the aerodynamic performance. The forward-bent blade adopted by the unidirectional multi-wing centrifugal fan impeller has good pneumatic performance, but the blade has strong unidirectionality, and the direct reversal performance is extremely deteriorated. Therefore, the reversible multi-wing centrifugal fan generally adopts radial blades, and the impeller can ensure that the pneumatic performance of the fan is basically consistent when the fan rotates forwards and reversely. But due to the molded line characteristics of the blades, the air quantity of the blades is only half of that of the forward-bent blades, and the working capacity and other aerodynamic performance of the blades are also obviously lower than those of the forward-bent impellers. And because the flow channel of the radial impeller is a full diffusion flow channel, airflow separation is easy to occur in the flow, a vortex is generated, and the flow loss is increased.

Disclosure of Invention

The invention aims to provide a reversible multi-wing centrifugal fan impeller device with forward and reverse adjustment and a fan, so as to overcome the defects in the prior art.

A reversible multi-wing centrifugal fan impeller device capable of forward and backward adjustment comprises an impeller rear disc and an impeller front disc, blades are rotatably mounted between the impeller rear disc and the impeller front disc, blade rotating gears are fixed at the ends of the blades, which are rotatably connected with the impeller front disc, a fluted disc motor support is fixed on the impeller front disc, a fluted disc motor is fixed on the fluted disc motor support, a fluted disc flange is fixed on an output shaft of the fluted disc motor, and a gear disc meshed with the blade rotating gears is fixed on the outer ring of the fluted disc flange.

Further, the blades are forward bending blades.

Furthermore, two ends of each blade are respectively connected with the impeller rear disc and the impeller front disc through rotating shafts, and lubricating grooves or bearings are arranged at the rotating connection positions of the blades and the impeller rear disc as well as the impeller front disc.

Furthermore, an impeller flange is fixed on the impeller rear disc and is fixedly connected with an output shaft of the impeller motor.

A reversible multi-wing centrifugal fan device with forward and backward adjustment comprises a volute and a multi-wing centrifugal fan impeller device arranged in the volute, wherein a fan air inlet is formed in the side face of the volute, a fluted disc motor of the multi-wing centrifugal fan impeller device and the fan air inlet are coaxially arranged, and an air blowing opening and an air exchanging opening are formed in the end portion of the volute.

Furthermore, a volute tongue is arranged between the air blowing port and the air exchange port on the volute.

Furthermore, a rotating volute plate is installed in the volute and is an arc-shaped plate, the corresponding axis of the arc-shaped plate of the rotating volute plate is parallel to the axis of the fluted disc motor, the rotating volute plate is nested in the volute, inner side walls of the volute are provided with inner wall sliding grooves of the upper surface of the volute, two sides of the rotating volute plate are embedded in the inner wall sliding grooves of the upper surface of the volute, and two ends of the rotating volute plate can be in contact with the inner wall of the volute tongue and the inner wall of the volute respectively.

Furthermore, a volute plate motor is installed at the rear end of the volute, an output shaft of the volute plate motor penetrates through the side wall of the volute, a volute plate driving gear is installed on the output shaft of the volute plate motor, a volute plate bottom rack is arranged on the outer ring of the rotating volute plate, and the volute plate driving gear can be meshed with the volute plate bottom rack.

Further, the arc angle of the rotating volute plate is 165 degrees.

Further, a collector is arranged at the air inlet of the fan of the volute.

Compared with the prior art, the invention has the following beneficial technical effects:

the invention relates to a reversible multi-wing centrifugal fan impeller device capable of forward and reverse adjustment, which adopts an impeller rear disc and an impeller front disc, wherein blades are rotatably arranged between the impeller rear disc and the impeller front disc, blade rotating gears are fixed at the end parts of the blades, which are rotatably connected with the impeller front disc, a fluted disc motor support is fixed on the impeller front disc, a fluted disc motor is fixed on the fluted disc motor support, a fluted disc flange is fixed on an output shaft of the fluted disc motor, a gear disc meshed with the blade rotating gears is fixed on the outer ring of the fluted disc flange, and the rotating angles of the blades are changed by utilizing the fluted disc motor, so that the consistency of the pneumatic performance of the fan during forward rotation and reverse rotation can be effectively ensured, the blades can be rotated to the optimal acting state, and the acting capacity is improved; the blade on the reversible multi-wing centrifugal fan is rotated through the structure to realize the switching of the positive and negative rotation two fan impellers, and the structure is simple, safe and reliable, and the operation is stable.

Furthermore, the blades are forward bent blades, so that the structure is simple, and the wind direction is adjusted in two directions stably.

Furthermore, two ends of each blade are connected with the impeller rear disc and the impeller front disc through rotating shafts respectively, so that the transmission efficiency is improved, and the friction is reduced.

The reversible multi-wing centrifugal fan device with the forward and reverse adjustment is characterized in that the multi-wing centrifugal fan impeller device is arranged in the volute, a fan air inlet is formed in the side face of the volute, a fluted disc motor of the multi-wing centrifugal fan impeller device is coaxially arranged with the fan air inlet, a blowing port and a scavenging port are formed in the end portion of the volute, the multi-wing centrifugal fan impeller device is of a reversible structure, different directions are adjusted by rotation of the blades, ventilation quantity adjustment of the blowing port or the scavenging port in the volute can be rapidly achieved, working efficiency of the integral multi-wing centrifugal fan device is improved, direction angles of the blades are convenient and reliable to adjust, a structure that two sides of the volute are symmetrically arranged is guaranteed, and efficiency of the volute is improved.

Furthermore, a volute tongue is arranged between the air blowing port and the air exchange port on the volute, the stability of a volute channel of the multi-wing centrifugal fan is adjusted by utilizing a volute tongue structure, and meanwhile, the conveying power is ensured by matching with the adjustment of the direction of the blades.

Furthermore, the invention adopts a rotating volute casing plate structure, and further matches the rotating direction of the blades by utilizing the rotating volute casing plate structure, thereby further ensuring the stability of wind flowing out from a single outlet and improving the working efficiency.

Drawings

FIG. 1 is a front view of a reversible multi-blade centrifugal fan in an embodiment of the present invention.

Fig. 2 is a rear view of a reversible multiple-blade centrifugal fan according to an embodiment of the present invention.

Fig. 3 is a top sectional view of a reversible multi-rotor centrifugal fan according to an embodiment of the present invention.

Fig. 4 is a front view of an impeller in an embodiment of the present invention.

Fig. 5 is a rear side view of an impeller in an embodiment of the present invention.

Fig. 6 is a schematic diagram of a structure of a rotating volute plate in an embodiment of the present invention, fig. 6a is a perspective view of the rotating volute plate, and fig. 6b is a front view of the rotating volute plate.

Fig. 7 is an internal structure of the blower in the forward rotation state and the reverse rotation state in the embodiment of the present invention, fig. 7a is a structure diagram of the forward rotation of the blower, and fig. 7a is a schematic structural diagram of the reverse rotation of the blower.

Fig. 8 is a partial structure of a blade in the embodiment of the present invention.

FIG. 9 is a partial structural view of the interior of the blower in the embodiment of the invention.

Fig. 10 is a flow state inside the forward and reverse rotation fan and a process of adjusting the vanes and the volute plate in the embodiment of the present invention, fig. 10a is a schematic diagram of a forward rotation limit position of the volute plate, fig. 10b is a schematic diagram of a rotation process of the volute plate, and fig. 10c is a schematic diagram of a reverse rotation limit position of the volute plate.

FIG. 11 shows an inner wall chute of the upper surface of the volute in accordance with an embodiment of the present invention.

Fig. 12 shows a conventional reversible multi-blade centrifugal fan structure.

In the figure: 1-an air blowing port; 2-an impeller motor; 3-a fluted disc motor; 4-volute tongue; 5-a ventilation port; 6-volute; 7-impeller flange; 8-fluted disc motor support; 9-blades; 10-a fluted disc flange; 11-a current collector; 12-a fan air inlet; 13-a volute plate motor; 14-blade rear disk rotating shaft; 15-impeller rear disc; 16-impeller front disc; 17-a gear wheel disc; 18-blade turning gear; 19-a volute plate motor support; 20-blade front disc rotating shaft; 21-rotating the volute plate; 22-volute plate bottom rack; 23-degree angle; 24-volute plate drive gear; 25 volute casing panel sides 1; 26-volute sides 2; 27-inner wall sliding groove on upper surface of volute.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

As shown in fig. 1 and 4, a reversible multi-wing centrifugal fan impeller device with forward and reverse adjustment comprises an impeller rear disc 15 and an impeller front disc 16, wherein blades 9 are rotatably installed between the impeller rear disc 15 and the impeller front disc 16, the blades 9 adopt forward bending blades, blade rotating gears 18 are fixed at the end parts of the blades 9 rotatably connected with the impeller front disc 16, a fluted disc motor support 8 is fixed on the impeller front disc 16, a fluted disc motor 3 is fixed on the fluted disc motor support 8, a fluted disc flange 10 is fixed on an output shaft of the fluted disc motor 3, a gear disc 17 meshed with the blade rotating gears 18 is fixed on the outer ring of the fluted disc flange 10, and the rotation angle of the blades 9 is changed by the fluted disc motor 3, so that the consistency of the pneumatic performance of the fan during forward rotation and reverse rotation can be effectively ensured, the blades 9 can be rotated to the optimal working state, and the working capacity can be improved; the blade 9 on the reversible multi-wing centrifugal fan is rotated through the structure to realize the switching of the positive and negative rotation two fan impellers, and the structure is simple, safe and reliable, and the operation is stable.

As shown in fig. 4 and 5, two ends of the blade 9 are respectively connected with the impeller rear disk 15 and the impeller front disk 16 through rotating shafts, one end of the blade 9 is connected with the impeller rear disk 15 through the blade rear disk rotating shaft 14, the other end of the blade 9 is connected with the impeller front disk 16 through the blade front disk rotating shaft 20, the blade rotating gear 18 is fixed at the end part of the other end of the blade 9, a lubricating groove or a mounting bearing is arranged at the rotating connection position of the blade 9, the impeller rear disk 15 and the impeller front disk 16, and the rotating friction force of the blade 9 is reduced by adopting lubricating oil lubrication or bearing lubrication. The blades 9 can rotate around the rotating shafts 14 of the blade back disks and the rotating shafts 20 of the blade front disks. The forward curved blade profile adopted by the blade 9 is a single arc forward curved blade. The axis of the fluted disc motor 3 is parallel to the rotation axis of the blade 9, namely the rotation axis of the blade 9 is parallel to the rotation axis of the whole reversible multi-wing centrifugal fan impeller device for forward and backward adjustment.

The impeller rear disc 15 is fixed with an impeller flange disc 7, the impeller flange disc 7 is used for being fixedly connected with an output shaft of the impeller motor 2, the impeller motor 2 fixed in the volute drives the impeller rear disc 15 and the impeller front disc 16 to integrally rotate through the impeller flange disc 7, and the angle of the blades 9 is controlled and adjusted through the fluted disc motor 3 rotating together with the blades, so that the working capacity of the blades 9 in different rotating directions is improved conveniently.

The fluted disc motor support 8, the fluted disc flange 10 and the impeller flange 7 all adopt hollow structures for air flow to enter, and meanwhile, the mass of the whole impeller device can be reduced, and the energy consumption is reduced; specifically, fluted disc motor support 8, fluted disc flange 10 and impeller ring flange 7 all adopt cross support structure or a triangular support structure, and the outer lane forms round connection structure, and fluted disc motor support 8, fluted disc flange 10 and impeller ring flange 7 are coaxial setting, and when adopting cross support structure or triangular support structure, the bearing structure is on same straight line. The fluted disc motor 3 and the impeller motor 2 are coaxially arranged.

The multi-wing centrifugal fan device based on the reversible multi-wing centrifugal fan impeller device with positive and negative regulation comprises a volute 6 and the multi-wing centrifugal fan impeller device, wherein a fan air inlet 12 is formed in the side surface of the volute 6, a current collector 11 is arranged at the fan air inlet 12, a fluted disc motor 3 of the multi-wing centrifugal fan impeller device is coaxially arranged with the fan air inlet 12, an air blowing port 1 and a scavenging port 5 are formed in the end part of the volute 6, the air blowing port 1 and the scavenging port 5 are respectively positioned on the upper side and the lower side of the axis of the fluted disc motor 3, and a volute tongue 4 is arranged on the volute 6 and positioned between the air blowing port 1 and the scavenging port 5; this application spiral case 6 is the same with current multi-wing centrifugal fan spiral case structure, and the multi-wing centrifugal fan impeller device structure of adoption is different, and the multi-wing centrifugal fan impeller device that this application adopted is reversible structure, utilizes the rotation adjustment equidirectional of blade 9, can realize the air volume adjustment of blowing mouth 1 or scavenge port 5 on the spiral case 6 fast, improves the acting efficiency of whole multi-wing centrifugal fan device.

As shown in fig. 6, 7 and 11, a rotating volute plate 21 is installed in the volute 6, the rotating volute plate 21 is an arc plate, the corresponding axis of the arc plate of the rotating volute plate 21 is parallel to the axis of the fluted disc motor 3, the rotating volute plate 21 is nested in the volute 6, two side walls in the volute 6 are provided with volute upper surface inner wall chutes 27, two sides of the rotating volute plate 21 are embedded in the volute upper surface inner wall chutes 27 and can slide relative to the volute 6, two ends of the rotating volute plate 21 are respectively in contact with the inner wall of the volute tongue 4 and the inner wall of the volute 6, and when the rotating volute plate 21 moves to two extreme positions, the air blowing port 1 and the air exchanging port 5 can be respectively isolated from the fan air inlet 12; specifically, as shown in fig. 7a, when the rotating volute plate 21 rotates forward to a limit position, the rotating volute plate 21 is located at the lower end of the reversible multi-blade centrifugal fan impeller device, at this time, the fan air inlet 12 is communicated with the air blowing opening 1, the impeller of the reversible multi-blade centrifugal fan impeller device is located at an anticlockwise rotation limit, at this time, the reversible multi-blade centrifugal fan impeller device rotates forward, and air is blown out from the air blowing opening 1; as shown in fig. 7b, when the rotating volute plate 21 rotates reversely to the limit position, the rotating volute plate 21 is located on the reversible multi-blade centrifugal fan impeller device, at this time, the fan air inlet 12 is communicated with the ventilating opening 5, the impeller of the reversible multi-blade centrifugal fan impeller device is located at the clockwise rotation limit, at this time, the reversible multi-blade centrifugal fan impeller device is rotated reversely, and the air is blown out from the ventilating opening 5; the adjustment of the orientation of the forward bent blades of the reversible multi-wing centrifugal fan is realized, and the efficiency of the fan is improved.

Specifically, the rotating volute plate 21 is driven by the volute plate motor 13 to rotate and adjust the direction, the volute plate motor 13 is fixed at the rear end of the volute 6, the output shaft of the volute plate motor 13 penetrates through the side wall of the volute 6, the volute plate driving gear 24 is mounted on the output shaft of the volute plate motor 13, the outer ring of the rotating volute plate 21 is provided with a volute plate bottom rack 22, the volute plate driving gear 24 can be meshed with the volute plate bottom rack 22, and the rotating volute plate 21 rotates in the volute 6 by means of meshing of the volute plate driving gear 24 on the volute plate motor 13 and the volute plate bottom rack 22, so that the rotating volute plate 21 is adjusted to be located at different positions.

As shown in fig. 6a and 6b, the molded line of the rotating volute plate 21 is an arc line with a θ angle 23, and the rotating volute plate 21 is adjusted according to the size of the reversible multi-blade centrifugal fan impeller device. The rotating volute plate 21 rotates around the reversible multi-wing centrifugal fan impeller device, and the volute plate sides 26 at the two ends of the rotating volute plate 21 abut against the inner wall of the volute 6 when rotating to the limit position.

When the fan rotates forwards, the positions of the blades 9 and the rotating volute plate 21 in the fan are shown in fig. 7a, at this time, the impeller rotates clockwise, the position of the blades 9 is adjusted to be clockwise forward curved, the position of the rotating volute plate 21 is below the position shown in fig. 7a, airflow enters the impeller from the air inlet 12, works by the blades 9, enters a gradually expanding forward volute formed by the volute 6 and the rotating volute plate 21, and is blown out from the air blowing port 1, and the flowing direction of the airflow is shown as the flowing direction in fig. 10 a;

when the fan rotates reversely to the middle position as shown in fig. 10b, and when the fan rotates reversely to the limit, the positions of the fan inner blade 9 and the rotating volute plate 21 are shown in fig. 7 b. The impeller now rotates anticlockwise and the vanes 9 are positionally adjusted to flex forwards anticlockwise with the position of the rotating volute plate 21 being above that shown in figure 7 b. The air flow enters the impeller from the air inlet 12, works by the blades 9, enters the divergent forward volute composed of the volute 6 and the rotating volute plate 21, and then is blown out from the scavenging port 5, and the flow direction of the air flow is shown as the flow direction in fig. 10 c.

The blade profile of the blade 9 is an arc-shaped blade profile and is connected with the impeller rear disc 15 through a blade rear disc rotating shaft 14; the front disk rotating shaft 20 is connected with the front disk 16 of the impeller through a front disk of the blade, as shown in fig. 8. The blades 9 can rotate circumferentially relative to the impeller back disk 15 and the impeller front disk 16 through the blade back disk rotating shaft 14 and the blade front disk rotating shaft 20. Wherein the tail end of the rotating shaft 20 of each blade front disc is provided with a blade rotating gear 18; the impeller front disk 16 is sandwiched between the blade rotation gear 18 and the blades 9. The blade rotating gear 18 is meshed with the inner ring of the gear disc 17, the upper surface of the gear disc 17 is fixedly connected with a fluted disc flange 10, and the fluted disc flange 10 is connected with the fluted disc motor 3. The fluted disc motor 3 is fixed on the fluted disc motor support 8, and the fluted disc motor support 8 is fixed on the impeller front disc 16, so that the fluted disc motor 3 is fixed relative to the impeller and rotates together with the impeller.

When the fan needs to be adjusted from a forward rotation forward bending impeller to a reverse rotation forward bending impeller, the fluted disc motor 3 receives an instruction to start rotating, the fluted disc flange 10 drives the gear disc 17 to rotate, and the gear disc 17 rotates to drive the blade rotating gear 18 to rotate, so that the blades 9 are adjusted in a rotating manner, and the switching from the forward rotation forward bending impeller to the reverse rotation forward bending impeller is realized; the vane states in the normal and reverse rotation states are as in the vane position state of fig. 7.

Wherein, the shape of the rotating volute plate 21 is a circular arc-shaped bent straight plate, the theta angle 23 is 165 degrees, and a rack 22 with the height of 1mm is fixed on the inner side surface of the bottom of the rotating volute plate 21, as shown in fig. 6. The lower wall surfaces of the rotating volute plate 21 are respectively in sliding contact with the lower side inner wall of the volute 6, the upper part of the rotating volute plate 21 is fixed in a sliding groove 27 on the inner surface of the upper side of the volute, and the volute plate 21 moves along the path of the sliding groove 27. The rotary volute plate 21 is connected with a volute plate driving gear 24 through an upper rack 22, the volute plate driving gear 24 is connected with a motor shaft of a volute plate driving motor 13, and the motor 13 is fixed on the outer surface of the volute through a motor support 19.

When the impeller of the fan is adjusted from forward rotation to bending impeller to backward rotation to impeller, the volute plate driving motor 13 starts to rotate to drive the volute plate driving gear 24 to rotate, the gear 24 drives the rack 22 connected with the gear 24, so that the volute plate 21 is driven to move along the chute track in the chute 27, and the volute plate in the forward rotation state is adjusted to the volute plate in the backward rotation state.

The scroll plate states in the forward rotation and reverse rotation states are as in the scroll plate position state of fig. 7, in which the position of the scroll plate side 125 corresponds to the volute tongue 4 in the forward rotation fan state, and the position of the scroll plate side 226 corresponds to the volute tongue 4 in the reverse rotation fan state.

Under the coordination of the position adjustment of the blades 9 and the volute plate 21, the forward rotation fan state and the reverse rotation fan state in the invention are both in a standard forward bending multi-wing centrifugal fan form, and fig. 10 respectively shows the airflow flowing direction of the lower inner part of the forward rotation fan, the adjusting process of the blades 9 and the volute rotating plate 21 from the forward rotation state to the reverse rotation state, and the airflow flowing direction of the lower inner part of the reverse rotation fan.

Claims

1. The utility model provides a reversible multiple wing centrifugal fan impeller device of positive and negative regulation, a serial communication port, including impeller back plate (15) and impeller front plate (16), install blade (9) between impeller back plate (15) and the impeller front plate (16) in the rotation, the tip that blade (9) and impeller front plate (16) are rotated and are connected is fixed with blade rotating gear (18), be fixed with fluted disc motor support (8) on impeller front plate (16), be fixed with fluted disc motor (3) on fluted disc motor support (8), the output shaft of fluted disc motor (3) is fixed with fluted disc flange (10), the outer lane of fluted disc flange (10) is fixed with toothed disc (17) with blade rotating gear (18) meshing, be fixed with impeller flange dish (7) on impeller back plate (15), impeller flange dish (7) are used for the output shaft fixed connection with impeller motor (2), blade (9) adopt forward crooked blade, fluted disc motor (3) drive toothed disc (17) through fluted disc flange (10) and rotate, toothed disc (17) rotate, moving blade rotating gear (18) are rotated, make the forward rotation of rotating gear (9) realize the forward rotation of reversal, the forward rotation of impeller.

2. The impeller device of the reversible multi-wing centrifugal fan with forward and backward adjustment as claimed in claim 1, wherein two ends of the blade (9) are respectively connected with the impeller rear disk (15) and the impeller front disk (16) through a rotating shaft, and a lubrication groove or a bearing is arranged at the rotating connection position of the blade (9) and the impeller rear disk (15) and the impeller front disk (16).

3. A reversible multi-wing centrifugal fan device with forward and backward adjustment is characterized by comprising a volute (6) and the multi-wing centrifugal fan impeller device according to claim 1, wherein the impeller device is arranged in the volute (6), a fan air inlet (12) is formed in the side face of the volute (6), a fluted disc motor (3) of the multi-wing centrifugal fan impeller device and the fan air inlet (12) are coaxially arranged, and an air blowing port (1) and an air exchanging port (5) are formed in the end portion of the volute (6).

4. The reversible multi-blade centrifugal fan device with forward and backward adjustment according to claim 3, characterized in that a volute tongue (4) is arranged on the volute (6) between the air blowing port (1) and the air exchanging port (5).

5. The reversible multi-wing centrifugal fan device with the forward and backward adjustment function according to claim 4, wherein a rotating volute plate (21) is installed in the volute (6), the rotating volute plate (21) is an arc-shaped plate, the corresponding axis of the arc-shaped plate of the rotating volute plate (21) is parallel to the axis of the fluted disc motor (3), the rotating volute plate (21) is nested in the volute (6), two inner side walls of the volute (6) are provided with inner wall sliding grooves (27) on the upper surface of the volute, two sides of the rotating volute plate (21) are embedded in the inner wall sliding grooves (27) on the upper surface of the volute, and two ends of the rotating volute plate (21) can be respectively in contact with the inner wall of the volute tongue (4) and the inner wall of the volute (6).

6. The reversible multi-wing centrifugal fan device with forward and backward adjustment as claimed in claim 5, wherein the rear end of the volute (6) is provided with the volute plate motor (13), the output shaft of the volute plate motor (13) passes through the side wall of the volute (6), the output shaft of the volute plate motor (13) is provided with the volute plate driving gear (24), the outer ring of the rotating volute plate (21) is provided with the volute plate bottom rack (22), and the volute plate driving gear (24) can be meshed with the volute plate bottom rack (22).

7. The reversible, multi-winged, centrifugal fan device of claim 5, wherein the arc angle of the rotating volute plate (21) is 165 °.

8. A reversible multiple-bladed centrifugal fan device according to claim 3, characterized in that the volute (6) is provided with a collector (11) at the fan inlet (12).