A high-efficiency and energy-saving centrifugal fan

Abstract

The present invention relates to the technical field of centrifugal fans, and in particular to a high-efficiency and energy-saving centrifugal fan, comprising a shell, an air inlet pipe and an impeller; further comprising a middle pipe, an inner stator, an outer rotor, a sleeve and a plurality of wind guide blades, wherein an inwardly contracted installation chamber is arranged at the bottom of a chamber of the shell, the middle pipe is vertically installed in the installation chamber of the shell, the inner stator is installed on the upper outer wall of the middle pipe, the outer rotor is rotatably installed on the outer side of the inner stator, the impeller is installed on the outer wall of the outer rotor, the impeller is located at the upper part of the chamber of the shell, the impeller is aligned with the air outlet of the shell, a sleeve is installed at the lower part of the outer rotor, the sleeve is sleeved on the middle outer side of the middle pipe, a plurality of wind guide blades are installed on the sleeve, the plurality of wind guide blades are inclinedly arranged, and the plurality of wind guide blades are located in an air guide channel; the exhaust airflow passes through the inner stator and the outer rotor for efficient heat dissipation, and a two-stage accelerated exhaust is adopted to increase the speed of the air outlet.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal fans, and in particular to a high-efficiency and energy-saving centrifugal fan. Background Art

[0002] A centrifugal fan is a machine that relies on input mechanical energy to increase gas pressure and discharge gas. It is a driven fluid machine. In the prior art, a variety of high-efficiency and energy-saving centrifugal fans have been proposed, such as the energy-saving and environmentally friendly centrifugal fan proposed in the Chinese invention patent with the announcement number CN114962302B, which includes: a housing, which is configured to have a flow channel for guiding airflow; a fan, which is used to disturb the airflow so that the airflow flows along the flow channel; a motor, which is used to drive the fan to rotate relative to the housing around a pivot axis; the fan includes: a blade portion, which includes a plurality of centrifugal blades to generate a centrifugal airflow away from the pivot axis; a guide portion, which changes the direction of the airflow parallel to the pivot axis so that the airflow flows into between two centrifugal blades at least in a direction obliquely intersecting the pivot axis; wherein the guide portion is provided with a plurality of chambers, and the chambers are filled with phase change materials so that when the phase change material undergoes a phase change reaction, the guide portion has a temperature field that promotes the airflow to flow into the blade portion; ensure the temperature difference between the air inlet and the outside, and reduce the energy loss of the centrifugal fan.

[0003] However, the motor of the centrifugal fan is not in contact with the air generated by the fan, so the motor can only dissipate heat passively, and the heat dissipation efficiency to the outside is low. In addition, the centrifugal fan only performs one-stage centrifugal acceleration on the incoming air, which is not conducive to increasing the speed of the outlet air. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an efficient and energy-saving centrifugal fan in which the exhaust airflow passes through an inner stator and an outer rotor for efficient heat dissipation and a two-stage accelerated exhaust is adopted to increase the air outlet speed.

[0005] The invention discloses a high-efficiency and energy-saving centrifugal fan, comprising a shell, an air inlet pipe and an impeller. A chamber is arranged inside the shell, an air outlet is arranged on the side wall of the shell, an air inlet pipe is arranged at the center of the end face of the shell, the air outlet and the air inlet pipe are connected with the chamber of the shell, and the impeller is located in the chamber of the shell; the invention also comprises a middle pipe, an inner stator, an outer rotor, a sleeve and a plurality of wind guide blades, an inwardly contracted installation chamber is arranged at the bottom of the chamber of the shell, the middle pipe is vertically installed in the installation chamber of the shell, the middle pipe is concentrically connected with the air inlet pipe, and an air inlet passage is arranged in the middle of the middle pipe A plurality of air guide holes are arranged at the lower part of the middle tube, an air guide passage communicating with the upper part of the chamber is arranged between the middle tube and the lower inner wall of the shell, the inner stator is arranged on the upper outer wall of the middle tube, the outer rotor is rotatably arranged on the outer side of the inner stator, the impeller is arranged on the outer wall of the outer rotor, the impeller is located at the upper part of the chamber of the shell, the impeller is aligned with the air outlet of the shell, a sleeve is arranged at the lower part of the outer rotor, the sleeve is sleeved on the outer side of the middle part of the middle tube, a plurality of air guide blades are arranged on the sleeve, the plurality of air guide blades are inclined, and the plurality of air guide blades are located in the air guide passage The impeller accelerates the air in the upper part of the chamber of the shell and discharges it through the air outlet. At the same time, the outer rotor drives the multiple air guide blades to rotate through the casing. The multiple air guide blades transport the air in the middle part of the chamber of the shell to the upper part of the chamber of the shell through the guide channel, so that the lower part of the chamber of the shell generates a negative pressure. The negative pressure causes the outside air to enter the air inlet channel of the middle pipe through the intake pipe and then enter the lower part of the chamber of the shell through the multiple air guide holes, thereby completing the air intake and exhaust blowing process. In this process, the air flows through the air inlet channel inside the middle pipe to cool the inner stator, and the air cools the outer rotor when it flows through the chamber of the shell, so that the heat generated by the inner stator and the outer rotor can be efficiently dissipated, avoiding the inner stator and the outer rotor from being overly high in temperature, keeping the temperature of the inner stator and the outer rotor stable, and also keeping the exhaust temperature stable. The air guide blades accelerate the intake air in the first stage, and the impeller accelerates the exhaust air in the second stage, thereby increasing the air outlet speed.

[0006] Preferably, it also includes a deflector cover, which is installed at the inner lower end of the middle tube and is located inside the multiple air guide holes of the middle tube; the deflector cover guides the air in the air inlet channel of the middle tube to the edge and the multiple air guide holes, thereby improving the smoothness of the airflow.

[0007] Preferably, it also includes a plurality of fins, the plurality of fins are installed on the inner wall of the middle tube, and the plurality of fins are aligned with the inner stator; by installing the plurality of fins, the heat dissipation area of ​​the middle tube and the inner stator is increased, thereby improving the heat dissipation efficiency of the inner stator.

[0008] Preferably, the impeller includes a back plate, a plurality of long blades and a plurality of short blades. The back plate is concentrically mounted on the outer wall of the upper end of the outer rotor. The plurality of long blades and the plurality of short blades are evenly mounted on the circumference of the lower end surface of the back plate. The plurality of long blades and the short blades are arranged alternately, and the length of the long blades is greater than the length of the short blades. The outer rotor drives the plurality of long blades and the plurality of short blades to rotate through the back plate, and the plurality of long blades and the plurality of short blades cooperate to accelerate the air. The design of different lengths of the long blades and the short blades combines the advantages of the long blades and the short blades, which is conducive to improving efficiency, reducing noise and increasing reliability.

[0009] Preferably, outer edges of the plurality of long blades and the plurality of short blades are located on the same circumference or inner edges of the plurality of long blades and the plurality of short blades are located on the same circumference.

[0010] Preferably, right-angle zone one is formed between the long blades and the back plate, and right-angle zone two is formed between the short blades and the back plate. Right-angle zone one and right-angle zone two are provided with gradually thickened rounded corners along the air flow direction, and finally fill up right-angle zone one and right-angle zone two. The above-mentioned arrangement effectively reduces the separation of airflow in the right-angle zone and improves the exhaust efficiency.

[0011] Preferably, it also includes multiple gears, bearing rings, multiple racks and push cylinders, multiple air guide blades are respectively rotatably mounted on the side walls of the sleeve through a rotating shaft, multiple gears are respectively concentrically mounted on the rotating shafts of the air guide blades, the bearing ring ring is arranged on the outer side of the sleeve, the rotating ring of the bearing ring is slidably connected to the sleeve for lifting and lowering, the rotating ring of the bearing ring rotates with the sleeve, multiple racks are mounted on the rotating ring of the bearing ring, the multiple racks are respectively meshed with the multiple gears, the fixed end of the push cylinder is mounted on the bottom of the chamber of the shell, and the piston rod of the push cylinder is connected to the fixed ring of the bearing ring; when the outer rotor rotates to drive the sleeve to rotate, the sleeve drives the multiple air guide blades to rotate through the rotating shaft, and at the same time, the sleeve drives the rotating ring of the bearing ring to rotate. When the inclination angle of the multiple air guide blades needs to be adjusted, the piston rod of the push cylinder is extended to push the bearing ring and the multiple racks to rise, and the multiple racks are respectively meshed with the multiple gears to rotate the multiple air guide blades, thereby adjusting the inclination angle of the multiple air guide blades, achieving different primary acceleration effects of the multiple air guide blades, and having good versatility.

[0012] Preferably, it also includes an acceleration box, a driving rod and a compressor impeller. The acceleration box is installed in the intake pipe through a bracket, the driving rod is installed on the outer rotor, the driving rod is connected to the input shaft of the acceleration box, and the compressor impeller is installed on the output shaft of the acceleration box, and the compressor impeller is located in the intake pipe. When the outer rotor rotates, the acceleration box is driven to operate through the driving rod, and the acceleration box drives the compressor impeller to rotate. The compressor impeller transports the air in the intake pipe to the intake channel of the middle pipe, thereby realizing active air intake and improving the intake efficiency.

[0013] Preferably, it also includes two cover plates and two shafts, the shafts are installed on the inner ends of the two cover plates, the two shafts are hinged to the middle part of the outer end of the intake pipe, and the two cover plates cooperate to close the intake pipe; the switch cover plates are rotatably installed on the outer port of the intake pipe through the two shafts, and the two cover plates open or close the intake pipe. When the two cover plates are closed, they protect the inner stator, outer rotor, impeller and other components.

[0014] Preferably, it also includes multiple gears 2, racks 2 and push cylinders 2, the multiple gears 2 are concentrically mounted on the ends of the shaft rod, racks 2 are slidably mounted on the intake pipe, racks 2 are meshed with gears 2, one end of push cylinders 2 is connected to the shell, and the other end of push cylinders 2 is connected to racks 2; the piston rod of push cylinders 2 is extended or shortened to push racks 2 to move back and forth along the intake pipe, so that racks 2 mesh with gears 2 to drive the two cover plates to rotate around the two cover plates respectively, thereby opening and closing the two cover plates, and being able to adjust the opening angles of the two cover plates to achieve regulation of the air intake.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: when working, the inner stator is energized to drive the outer rotor to rotate, the outer rotor drives the impeller to rotate, the impeller accelerates the air in the upper part of the chamber of the shell and discharges it through the air outlet, and at the same time, the outer rotor drives the multiple air guide blades to rotate through the sleeve, and the multiple air guide blades transport the air in the middle part of the chamber of the shell to the upper part of the chamber of the shell through the guide channel, so that negative pressure is generated in the lower part of the chamber of the shell, and the negative pressure causes the outside air to enter the air inlet channel of the middle pipe through the intake pipe and then enter through the multiple air guide holes To the lower part of the chamber of the shell, thereby completing the air intake and exhaust blowing process. During this process, the air flows through the air inlet channel inside the middle tube to cool the inner stator, and cools the outer rotor when the air flows through the chamber of the shell, so that the heat generated by the inner stator and the outer rotor can be efficiently dissipated, avoiding the inner stator and the outer rotor from overheating, keeping the temperature of the inner stator and the outer rotor stable, and also keeping the exhaust temperature stable, and the wind guide blades accelerate the intake air in the first stage, and the impeller accelerates the exhaust air in the second stage, thereby increasing the air outlet speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] Figure 2 It is a front cross-sectional structural schematic diagram of the present invention;

[0018] Figure 3 It is a schematic diagram of the axonometric structure of the present invention;

[0019] Figure 4 It is a schematic structural diagram of the present invention in a decomposed state;

[0020] Figure 5 It is a schematic diagram of the structure of the middle tube and inner stator;

[0021] Figure 6 It is a schematic diagram of the structure of the outer rotor, wind guide blades, gear one, bearing ring, push cylinder one, speed increase box and compressor impeller;

[0022] Figure 7 It is a structural diagram of the first structural form of the impeller;

[0023] Figure 8 It is a structural schematic diagram of the second structural form of the impeller;

[0024] Fig. 9 It is a schematic diagram of the structure of the blade fillet of the impeller;

[0025] Fig.10 It is a schematic diagram of the structure of the intake pipe, the cover plate, the second gear, the second rack and the second push cylinder.

[0026] Markings in the attached figure: 1. casing; 2. air intake pipe; 3. impeller; 4. middle pipe; 5. inner stator; 6. outer rotor; 7. sleeve; 8. wind guide blade; 9. fairing; 10. fin; 11. back plate; 12. long blade; 13. short blade; 14. gear one; 15. bearing ring; 16. rack; 17. push cylinder one; 18. acceleration box; 19. drive rod; 20. compressor impeller; 21. cover plate; 22. shaft; 23. gear two; 24. rack two; 25. push cylinder two. DETAILED DESCRIPTION

[0027] In order to facilitate understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0028] Embodiment 1, as Figures 1 to 6As shown, a high-efficiency and energy-saving centrifugal fan includes a shell 1, an air inlet pipe 2 and an impeller 3. A chamber is arranged inside the shell 1, an air outlet is arranged on the side wall of the shell 1, an air inlet pipe 2 is arranged at the center of the end surface of the shell 1, the air outlet and the air inlet pipe 2 are connected to the chamber of the shell 1, and the impeller 3 is located in the chamber of the shell 1; it also includes a middle pipe 4, an inner stator 5, an outer rotor 6, a sleeve 7 and a plurality of wind guide blades 8. An inwardly contracted installation chamber is arranged at the bottom of the chamber of the shell 1, the middle pipe 4 is vertically installed in the installation chamber of the shell 1, the middle pipe 4 is concentrically connected with the air inlet pipe 2, an air inlet channel is arranged in the middle of the middle pipe 4, a plurality of air guide holes are arranged at the lower part of the middle pipe 4, an air guide channel connected to the upper part of the chamber is arranged between the middle pipe 4 and the lower inner wall of the shell 1, and the inner stator 5 is installed On the upper outer wall of the middle pipe 4, the outer rotor 6 is rotatably mounted on the outer side of the inner stator 5, the impeller 3 is mounted on the outer wall of the outer rotor 6, the impeller 3 is located in the upper part of the chamber of the shell 1, the impeller 3 is aligned with the air outlet of the shell 1, the lower part of the outer rotor 6 is installed with a sleeve 7, the sleeve 7 is sleeved on the middle outer side of the middle pipe 4, a plurality of wind guide blades 8 are mounted on the sleeve 7, the plurality of wind guide blades 8 are tilted, and the plurality of wind guide blades 8 are located in the wind guide channel; it also includes the middle pipe 4, the inner stator 5, the outer rotor 6, the sleeve 7 and the plurality of wind guide blades 8, the bottom of the chamber of the shell 1 is provided with an inwardly contracted installation chamber, the middle pipe 4 is vertically installed in the installation chamber of the shell 1, the middle pipe 4 is concentrically connected with the air inlet pipe 2, the middle part of the middle pipe 4 is provided with an air inlet channel, and the lower part of the middle pipe 4 is provided with A plurality of air guide holes, an air guide channel connected to the upper part of the chamber is arranged between the middle tube 4 and the lower inner wall of the shell 1, the inner stator 5 is mounted on the upper outer wall of the middle tube 4, the outer rotor 6 is rotatably mounted on the outer side of the inner stator 5, the impeller 3 is mounted on the outer wall of the outer rotor 6, the impeller 3 is located in the upper part of the chamber of the shell 1, the impeller 3 is aligned with the air outlet of the shell 1, a sleeve 7 is installed at the lower part of the outer rotor 6, the sleeve 7 is sleeved on the middle outer side of the middle tube 4, a plurality of air guide blades 8 are installed on the sleeve 7, the plurality of air guide blades 8 are inclinedly arranged, and the plurality of air guide blades 8 are located in the air guide channel; it also includes a guide cover 9, which is mounted on the inner lower end of the middle tube 4, and the guide cover 9 is located on the inner side of the plurality of air guide holes of the middle tube 4; it also includes a plurality of fins 10, the inner wall of the middle tube 4 A plurality of fins 10 are mounted on the casing 7, and the plurality of fins 10 are aligned with the inner stator 5; the casing 7 also includes a plurality of gears 14, a bearing ring 15, a plurality of racks 16 and a push cylinder 17; a plurality of air guide blades 8 are respectively mounted on the side wall of the casing 7 by rotating shafts; a plurality of gears 14 are respectively mounted concentrically on the rotating shafts of the air guide blades 8; a bearing ring 15 is arranged on the outer side of the casing 7; a rotating ring of the bearing ring 15 is slidably connected to the casing 7 so as to be liftable; the rotating ring of the bearing ring 15 rotates with the casing 7; a plurality of racks 16 are mounted on the rotating ring of the bearing ring 15; a plurality of racks 16 are respectively meshed with a plurality of gears 14; a fixed end of the push cylinder 17 is mounted on the bottom of the chamber of the casing 1; a piston rod of the push cylinder 17 is connected to a fixed ring of the bearing ring 15;It also includes an acceleration box 18, a driving rod 19 and a compressor impeller 20. The acceleration box 18 is installed in the air intake pipe 2 through a bracket. The driving rod 19 is installed on the outer rotor 6. The driving rod 19 is connected to the input shaft of the acceleration box 18 by driving. The compressor impeller 20 is installed on the output shaft of the acceleration box 18. The compressor impeller 20 is located in the air intake pipe 2.

[0029] During operation, the inner stator 5 is energized to drive the outer rotor 6 to rotate, and the outer rotor 6 drives the acceleration box 18 to operate through the driving rod 19, and the acceleration box 18 drives the compressor impeller 20 to rotate, and the compressor impeller 20 transports the air in the intake pipe 2 to the intake channel of the middle pipe 4. At the same time, the outer rotor 6 drives the impeller 3 to rotate, and the impeller 3 accelerates the air in the upper part of the chamber of the shell 1 and discharges it through the air outlet. At the same time, the outer rotor 6 drives the multiple air guide blades 8 to rotate through the sleeve 7, and the multiple air guide blades 8 transport the air in the middle of the chamber of the shell 1 to the upper part of the chamber of the shell 1 through the guide channel, so that negative pressure is generated in the lower part of the chamber of the shell 1. The negative pressure causes the outside air to enter the air inlet channel of the middle pipe 4 through the intake pipe 2, and the air guide cover 9 guides the air in the air inlet channel of the middle pipe 4 to the side The air is guided by the edge and multiple air guide holes, so that the air enters the lower part of the chamber of the shell 1 through the multiple air guide holes, thereby completing the air intake and exhaust blowing process. In this process, the air flows through the air inlet channel inside the middle tube 4 to cool the inner stator 5. By installing multiple fins 10, the heat dissipation area of ​​the middle tube 4 and the inner stator 5 is increased, and the heat dissipation efficiency of the inner stator 5 is improved. When the air flows through the chamber of the shell 1, the outer rotor 6 is cooled, so that the heat generated by the inner stator 5 and the outer rotor 6 can be efficiently dissipated, avoiding the inner stator 5 and the outer rotor 6 from being too high, so that the temperature of the inner stator 5 and the outer rotor 6 remains stable, and the exhaust temperature also remains stable. In addition, the air guide blades 8 perform a first-stage acceleration on the intake, and the impeller 3 performs a second-stage acceleration on the exhaust, thereby increasing the air outlet speed.

[0030] When the outer rotor 6 rotates and drives the sleeve 7 to rotate, the sleeve 7 drives the multiple air guide blades 8 to rotate through the rotating shaft. At the same time, the sleeve 7 drives the rotating ring of the bearing ring 15 to rotate. When the inclination angle of the multiple air guide blades 8 needs to be adjusted, the piston rod of the push cylinder 17 extends to push the bearing ring 15 and the multiple racks 16 to rise. The multiple racks 16 respectively engage with the multiple gears 14 to rotate the multiple air guide blades 8, thereby adjusting the inclination angle of the multiple air guide blades 8 and achieving different primary acceleration effects of the multiple air guide blades 8.

[0031] Embodiment 2, as Figure 4 , Figure 7 , Figure 8 and Fig. 9As shown, on the basis of Example 1, the impeller 3 includes a back plate 11, a plurality of long blades 12 and a plurality of short blades 13, the back plate 11 is concentrically mounted on the outer wall of the upper end of the outer rotor 6, and a plurality of long blades 12 and a plurality of short blades 13 are evenly mounted on the circumference of the lower end surface of the back plate 11, the plurality of long blades 12 and the short blades 13 are staggered, the length of the long blades 12 is greater than the length of the short blades 13; the outer edges of the plurality of long blades 12 and the plurality of short blades 13 are on the same circumference or the inner edges of the plurality of long blades 12 and the plurality of short blades 13 are on the same circumference; a right angle zone 1 is formed between the long blades 12 and the back plate 11, and a right angle zone 2 is formed between the short blades 13 and the back plate 11, and the right angle zone 1 and the right angle zone 2 are provided with fillets that gradually thicken along the air flow direction, and finally fill the right angle zone 1 and the right angle zone 2.

[0032] The outer rotor 6 drives the multiple long blades 12 and the multiple short blades 13 to rotate through the back plate 11. The multiple long blades 12 and the multiple short blades 13 cooperate to accelerate the air. The design of different lengths of the long blades 12 and the short blades 13 combines the advantages of the long blades and the short blades, which is beneficial to improving efficiency, reducing noise, and increasing reliability. The above arrangement effectively reduces the separation of airflow in the right-angle area and improves the exhaust efficiency.

[0033] Embodiment 3, as Figure 1 , Figure 2 , Figure 3 and Fig.10 As shown, on the basis of Example 1, it also includes two cover plates 21 and two shaft rods 22, the shaft rods 22 are installed on the inner ends of the two cover plates 21, the two shaft rods 22 are hinged to the middle part of the outer end of the intake pipe 2, and the two cover plates 21 cooperate to close the intake pipe 2; it also includes a plurality of gears 23, racks 24 and push cylinders 25, the plurality of gears 23 are concentrically installed on the ends of the shaft rods 22, the racks 24 are slidably installed on the intake pipe 2, the racks 24 are meshed with the gears 23, one end of the push cylinder 25 is connected to the shell 1, and the other end of the push cylinder 25 is connected to the racks 24.

[0034] The switch cover plates 21 are rotatably installed on the outer ports of the intake pipe 2 through two shafts 22 respectively. The two cover plates 21 open or close the intake pipe 2. After the two cover plates 21 are closed, the inner stator 5, the outer rotor 6, the impeller 3 and other components are protected. The piston rod of the push cylinder 25 is extended or shortened to push the rack 24 to move back and forth along the intake pipe 2, so that the rack 24 meshes with the gear 23 to drive the two cover plates 21 to rotate around the two cover plates 21 respectively, thereby opening and closing the two cover plates 21, and being able to adjust the opening angle of the two cover plates 21 to achieve the adjustment of the intake.

[0035] like Figures 1 to 10As shown, a high-efficiency and energy-saving centrifugal fan of the present invention, when working, firstly, the piston rod of the push cylinder 25 pushes the rack 24 to move along the air inlet pipe 2, so that the rack 24 meshes with the gear 23 to drive the two cover plates 21 to rotate around the two cover plates 21 respectively, and the two cover plates 21 are opened, and then the inner stator 5 is energized to drive the outer rotor 6 to rotate, and the outer rotor 6 drives the impeller 3 to rotate, and the impeller 3 accelerates the air in the upper part of the chamber of the shell 1 and discharges it through the air outlet, and at the same time, the outer rotor 6 drives the multiple air guide blades 8 to rotate through the sleeve 7, and the multiple air guide blades 8 transport the air in the middle of the chamber of the shell 1 to the upper part of the chamber of the shell 1 through the guide channel, so that the lower part of the chamber of the shell 1 generates negative pressure, and the negative pressure makes the outer The air from the outside enters the air inlet channel of the middle pipe 4 through the air inlet pipe 2 and then enters the lower part of the chamber of the shell 1 through multiple air guide holes, thereby completing the air intake and exhaust blowing process. Then, when the outer rotor 6 rotates, the acceleration box 18 is driven to operate through the driving rod 19. The acceleration box 18 drives the compressor impeller 20 to rotate. The compressor impeller 20 transports the air in the air inlet pipe 2 to the air inlet channel of the middle pipe 4, thereby realizing active air intake and improving the air intake efficiency. Finally, the piston rod of the push cylinder 17 is extended to push the bearing ring 15 and multiple racks 16 to rise. The multiple racks 16 respectively mesh with multiple gears 14 to rotate the multiple guide blades 8, thereby adjusting the inclination angle of the multiple guide blades 8 and adjusting the primary acceleration effect of the multiple guide blades 8.

[0036] The main functions achieved by the present invention are:

[0037] 1. The air flow cools down the inner stator 5 and the outer rotor 6, so that the heat generated by the inner stator 5 and the outer rotor 6 can be efficiently dissipated, avoiding the inner stator 5 and the outer rotor 6 from being overheated, keeping the temperature of the inner stator 5 and the outer rotor 6 stable, and also keeping the exhaust temperature stable;

[0038] 2. The air guide blades 8 accelerate the intake air in the first stage, and the impeller 3 accelerates the exhaust air in the second stage, thereby increasing the speed of the air outlet;

[0039] 3. Different acceleration effects can be achieved by adjusting the inclination angles of the multiple air guide blades 8;

[0040] 4. The long and short blade design combines the advantages of long blades and short blades, which is beneficial to improve efficiency, reduce noise and increase reliability;

[0041] 5. Capable of active air intake and adjusting the air intake efficiency.

[0042] The installation method, connection method or setting method of the high-efficiency energy-saving centrifugal fan of the present invention are all common mechanical methods, and can be implemented as long as they can achieve their beneficial effects; the shell 1, air intake pipe 2, impeller 3, inner stator 5, outer rotor 6, wind guide blades 8, fins 10, gear one 14, bearing ring 15, rack 16, push cylinder one 17, acceleration box 18, compressor impeller 20, gear two 23, rack two 24, push cylinder two 25 of the high-efficiency energy-saving centrifugal fan of the present invention are purchased on the market, and technical personnel in the industry only need to install and operate them according to the accompanying instruction manual, without the need for technical personnel in this field to pay creative labor.

[0043] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A high-efficiency energy-saving centrifugal fan, comprising a housing (1), an air inlet pipe (2) and an impeller (3), wherein a chamber is arranged inside the housing (1), an air outlet is arranged on a side wall of the housing (1), an air inlet pipe (2) is arranged at the center of an end surface of the housing (1), the air outlet and the air inlet pipe (2) are connected to the chamber of the housing (1), and the impeller (3) is located in the chamber of the housing (1); characterized in that: The invention also comprises a middle tube (4), an inner stator (5), an outer rotor (6), a sleeve (7) and a plurality of air guide blades (8); an inwardly contracted installation chamber is arranged at the bottom of the chamber of the shell (1); the middle tube (4) is vertically installed in the installation chamber of the shell (1); the middle tube (4) is concentrically connected to the air inlet pipe (2); an air inlet channel is arranged in the middle of the middle tube (4); a plurality of air guide holes are arranged at the lower part of the middle tube (4); an air guide channel communicating with the upper part of the chamber is arranged between the middle tube (4) and the lower inner wall of the shell (1); the inner stator (5) is installed in the middle tube (4); On the upper outer wall of the tube (4), an outer rotor (6) is rotatably mounted on the outer side of the inner stator (5), an impeller (3) is mounted on the outer wall of the outer rotor (6), the impeller (3) is located at the upper part of the chamber of the shell (1), the impeller (3) is aligned with the air outlet of the shell (1), a sleeve (7) is mounted at the lower part of the outer rotor (6), the sleeve (7) is sleeved on the outer side of the middle part of the middle tube (4), a plurality of air guide blades (8) are mounted on the sleeve (7), the plurality of air guide blades (8) are tiltedly arranged, and the plurality of air guide blades (8) are located in the air guide channel.

2. A high-efficiency energy-saving centrifugal fan as claimed in claim 1, characterized in that: It also includes a deflector cover (9), which is mounted on the lower end of the interior of the middle tube (4), and the deflector cover (9) is located inside a plurality of air guide holes of the middle tube (4).

3. The high-efficiency energy-saving centrifugal fan according to claim 1, characterized in that: It also includes a plurality of fins (10), the plurality of fins (10) being mounted on the inner wall of the middle tube (4), and the plurality of fins (10) being aligned with the inner stator (5).

4. The high-efficiency energy-saving centrifugal fan according to claim 1, characterized in that: The impeller (3) comprises a back plate (11), a plurality of long blades (12) and a plurality of short blades (13); the back plate (11) is concentrically mounted on the upper outer wall of the outer rotor (6); the plurality of long blades (12) and the plurality of short blades (13) are evenly mounted on the circumference of the lower end surface of the back plate (11); the plurality of long blades (12) and the short blades (13) are arranged in a staggered manner; the length of the long blades (12) is greater than the length of the short blades (13).

5. The high-efficiency energy-saving centrifugal fan according to claim 4, characterized in that: The outer edges of the plurality of long blades (12) and the plurality of short blades (13) are located on the same circumference, or the inner edges of the plurality of long blades (12) and the plurality of short blades (13) are located on the same circumference.

6. A high-efficiency energy-saving centrifugal fan as claimed in claim 4, characterized in that: A right angle area 1 is formed between the long blade (12) and the back plate (11), and a right angle area 2 is formed between the short blade (13) and the back plate (11). The right angle area 1 and the right angle area 2 are provided with rounded corners that gradually thicken along the air flow direction, and eventually fill up the right angle area 1 and the right angle area 2.

7. The high-efficiency energy-saving centrifugal fan according to claim 1, characterized in that: The invention also comprises a plurality of gears (14), a bearing ring (15), a plurality of racks (16) and a push cylinder (17); the plurality of air guide blades (8) are rotatably mounted on the side wall of the sleeve (7) via a rotating shaft; the plurality of gears (14) are concentrically mounted on the rotating shaft of the air guide blades (8); the bearing ring (15) is arranged on the outer side of the sleeve (7); the rotating ring of the bearing ring (15) is slidably connected to the sleeve (7) so as to be liftable; the rotating ring of the bearing ring (15) rotates with the sleeve (7); the plurality of racks (16) are mounted on the rotating ring of the bearing ring (15); the plurality of racks (16) are meshed with the plurality of gears (14); the fixed end of the push cylinder (17) is mounted on the bottom of the chamber of the housing (1); and the piston rod of the push cylinder (17) is connected to the fixed ring of the bearing ring (15).

8. The high-efficiency energy-saving centrifugal fan according to claim 1, characterized in that: It also includes an acceleration box (18), a drive rod (19) and a compressor impeller (20), wherein the acceleration box (18) is mounted in the air intake pipe (2) via a bracket, the drive rod (19) is mounted on the outer rotor (6), the drive rod (19) is drivingly connected to the input shaft of the acceleration box (18), the compressor impeller (20) is mounted on the output shaft of the acceleration box (18), and the compressor impeller (20) is located in the air intake pipe (2).

9. The high-efficiency energy-saving centrifugal fan according to claim 1, characterized in that: It also includes two cover plates (21) and two shaft rods (22). The shaft rods (22) are mounted on the inner ends of the two cover plates (21). The two shaft rods (22) are hinged to the middle of the outer end of the air intake pipe (2). The two cover plates (21) cooperate to close the air intake pipe (2).

10. The high-efficiency energy-saving centrifugal fan according to claim 9, characterized in that: It also includes a plurality of gears (23), racks (24) and push cylinders (25). The plurality of gears (23) are respectively concentrically mounted on the ends of the shaft (22). The racks (24) are slidably mounted on the intake pipe (2). The racks (24) mesh with the gears (23). One end of the push cylinder (25) is connected to the housing (1), and the other end of the push cylinder (25) is connected to the racks (24).

Images