Energy-saving and noise-reducing centrifugal fan and control method thereof

Abstract

The invention discloses an energy-saving and noise-reducing type centrifugal fan and a control method thereof, and particularly relates to the technical field of centrifugal fans, the energy-saving and noise-reducing type centrifugal fan comprises a support, a fan shell, a motor, an input port, an output port, a rear disc and a front disc, a plurality of fan blades are rotationally arranged between the rear disc and the front disc, and the energy-saving and noise-reducing type centrifugal fan further comprises a plurality of angle adjusting assemblies. Through the arrangement of the adjusting assembly, the angle of the fan blade rotating to the output port is increased, the angle of the fan blade driving away from the output port is reduced, the angle of the fan blades is automatically adjusted, gas entering the fan shell can be more effectively exhausted, violent vortexes generated at the output port due to flow separation are reduced, and the service life of the fan is prolonged. Turbulence noise is fundamentally reduced, the fan runs more stably, the system reliability is improved, vortex and flow separation is reduced, energy transfer is more sufficient, more electric energy is converted into wind energy air pressure, efficiency is directly improved, and running power consumption is reduced.

Description

Technical Field

[0001] This invention relates to the field of centrifugal fan technology, and more specifically, to an energy-saving and noise-reducing centrifugal fan and its control method. Background Technology

[0002] Centrifugal fans are machines that rely on input mechanical energy to increase gas pressure and discharge gas; they are a type of driven fluid machinery. Centrifugal fans are widely used in ventilation, dust removal, and cooling in factories, mines, tunnels, cooling towers, vehicles, ships, and buildings; ventilation and induced draft in boilers and industrial furnaces; cooling and ventilation in air conditioning equipment and household appliances; grain drying and conveying; wind tunnel air sources; and inflation and propulsion for hovercraft, etc.

[0003] Centrifugal fans, as key equipment widely used in industrial fields, directly affect system energy consumption and noise levels through their operating efficiency and stability. However, during the operation of a centrifugal fan, when gas flows through the fan casing to the outlet, changes in flow state can easily lead to flow separation, which in turn forms severe turbulence. This not only causes serious turbulent noise, affecting the fan's operational stability and system reliability, but also results in insufficient energy transfer due to vortices and flow separation, leading to low conversion efficiency of electrical energy to wind energy and air pressure, thus increasing operating power consumption. At the same time, when the temperature inside the fan rises due to the intake of high-temperature gas, the temperature rise can cause changes in the gas state, easily inducing intake impact, intensified flow separation, and even surge, seriously threatening the safe and stable operation of the system.

[0004] This invention provides an energy-saving and noise-reducing centrifugal fan and its control method, aiming to solve the problems that during the operation of the centrifugal fan, when the gas flows in the fan casing to the outlet position, it is easy to generate turbulent noise, which increases the power consumption of operation, and the gas state changes caused by the temperature rise, which seriously threatens the safe and stable operation of the system. Summary of the Invention

[0005] The purpose of this invention is to provide an energy-saving and noise-reducing centrifugal fan and its control method, in order to solve the problems mentioned in the background art, such as the generation of turbulent noise and increased power consumption when gas flows through the fan casing to the outlet position during the operation of the centrifugal fan, and the change in gas state caused by temperature rise, which seriously threatens the safe and stable operation of the system.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an energy-saving and noise-reducing centrifugal fan, comprising a support frame, a fan housing, a motor, an inlet, an outlet, a rear plate, and a front plate, wherein a plurality of equidistant fan blades are rotatably arranged between the rear plate and the front plate, and further comprising: Multiple sets of adjustment components, the same number as the fan blades, are all located inside the rear disc. They are used to independently adjust the angle of the fan blades at the corresponding positions when the output ports are in relative positions, and to drive all the fan blade angles to decrease synchronously through the thermal expansion effect when the internal temperature of the fan rises.

[0007] Preferably, a guide ring is fixedly connected inside the fan housing and sleeved on the outer side of the rear disc circumference, and the inner wall of the guide ring is provided with a recess at the position corresponding to the output port; The outer circumferential wall of the rear disc is provided with adjustment grooves that are the same number and position as the fan blades, and multiple sets of adjustment components are respectively arranged in the corresponding adjustment grooves.

[0008] Preferably, the adjustment assembly includes a drive sleeve, a drive block, and an elastic element. The drive sleeve is slidably connected in the adjustment groove, and a drive wheel is rotatably connected to one end of the drive sleeve. The drive block is disposed at the other end of the drive sleeve, and the elastic element is disposed between the drive block and the inner wall of the adjustment groove.

[0009] Preferably, the drive wheel is configured to contact and roll against the inner wall of the guide ring, and the elastic element is used to provide the drive wheel with an elastic force that presses it against the inner wall of the guide ring.

[0010] Preferably, the drive block has a deflection groove, and a deflection sleeve is rotatably connected to the deflection groove via a deflection shaft. The shaft of the fan blade extends into the adjustment groove and is fixedly connected to a deflection block, which is slidably sleeved within the deflection sleeve.

[0011] Preferably, when the drive wheel rolls to the recessed position, the elastic element pushes the drive block to move outward from the adjustment groove, and the deflection sleeve drives the fan blade angle to increase; When the drive wheel moves away from the recessed position, the drive wheel pushes the drive block to move inward toward the adjustment groove, and the deflection sleeve causes the fan blade angle to decrease.

[0012] Preferably, the adjustment assembly further includes a sliding groove formed in the drive sleeve and a piston member disposed in the sliding groove, the piston member being fixedly connected to the drive block, and the sliding groove being filled with thermal expansion gas on the side of the piston member away from the drive block.

[0013] Preferably, when the thermally expanding gas expands due to heat, it can push the piston and the drive block to move and overcome the elastic force of the elastic element.

[0014] Preferably, the front plate and the rear plate are fixed by a support member.

[0015] A control method for an energy-saving and noise-reducing centrifugal fan includes: When the fan blades rotate to the output position, their angle is increased by the corresponding adjustment component to improve the gas discharge efficiency. When the fan blades move away from the output port, their angle is reduced by the corresponding adjustment component to reduce the backflow resistance; When the temperature exceeds the threshold, the angle of all fan blades is reduced synchronously by adjusting the components to suppress intake shock and surge.

[0016] The technical effects and advantages of this invention are as follows: 1. This invention adjusts the settings of the components to increase the angle of the fan blades when rotating to the output position and decrease the angle of the fan blades when moving away from the output position. The automatic adjustment of the fan blade angle can more effectively discharge the gas entering the fan casing, reduce the violent eddies caused by flow separation at the output position, fundamentally reduce turbulence noise, make the fan run more smoothly, improve system reliability, and reduce eddies and flow separation, so that energy transfer is more complete, thereby converting more electrical energy into wind energy and air pressure, directly improving efficiency and reducing operating power consumption; 2. This invention, through the design of sliding grooves and piston components, allows the piston component and drive block to move towards the adjustment groove when the temperature rises due to the intake of high-temperature gas inside the fan. During this movement, the deflection sleeve deflects within the deflection groove, and the deflection block and shaft drive the corresponding fan blades to rotate, thereby reducing the angle of all fan blades. This effectively reduces intake impact and flow separation losses, further reduces harmful surge phenomena, enhances system reliability, and protects the equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the fan blade part of the present invention.

[0019] Figure 3 This is a cross-sectional view of the fan blade angle adjustment state of the present invention.

[0020] Figure 4 This is a schematic diagram of the internal structure of the adjusting groove of the present invention.

[0021] Figure 5 For the present invention Figure 4 Enlarged view of the structure of part A.

[0022] Figure 6 This is a schematic diagram of the adjustment component structure of the present invention.

[0023] Figure 7 This is an exploded view of the regulating component of the present invention.

[0024] Figure 8 This is a schematic diagram of the internal structure of the sliding groove of the present invention.

[0025] The attached figures are labeled as follows: 1. Bracket; 11. Fan housing; 12. Motor; 13. Inlet; 14. Outlet; 15. Rear plate; 16. Front plate; 17. Fan blade; 18. Adjustment groove; 2. Adjustment assembly; 21. Drive sleeve; 22. Drive wheel; 23. Drive block; 24. Elastic element; 25. Deflection groove; 26. Deflection shaft; 27. Deflection sleeve; 28. Deflection block; 29. ​​Guide ring; 210. Recess; 211. Sliding groove; 212. Piston. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] During the operation of a centrifugal fan, when the gas flows through the fan casing to the outlet, the change in flow state easily causes flow separation, which in turn forms violent eddies. This not only leads to severe turbulent noise, affecting the fan's operational stability and system reliability, but also results in insufficient energy transfer due to eddies and flow separation, causing low efficiency in converting electrical energy into wind energy and increasing operating power consumption.

[0028] Example 1 refer to Figures 1 to 8 An embodiment of the present invention provides an energy-saving and noise-reducing centrifugal fan, comprising a support 1, on which a fan housing 11 and a motor 12 are mounted. The fan housing 11 has an inlet 13 and an outlet 14. The motor 12 is located on the side of the fan housing 11 away from the inlet 13. Inside the fan housing 11, a rear plate 15 is fixedly connected to the output end of the motor 12. On the side of the rear plate 15 away from the motor 12, a front plate 16 is fixedly connected by a support member. An air inlet is provided on the front plate 16. A plurality of equidistant fan blades 17 are rotatably connected between the front plate 16 and the rear plate 15. The two ends of the fan blades 17 are rotatably connected to the front plate 16 and the rear plate 15 through a rotating shaft.

[0029] refer to Figures 2 to 6It also includes multiple sets of angle adjustment components 2, the number of adjustment components 2 is the same as that of fan blades 17, and the outer circumferential wall of the rear disc 15 is provided with adjustment grooves 18, the same number as the number of fan blades 17 and corresponding in position. Multiple sets of adjustment components 2 are respectively set in the corresponding adjustment grooves 18, including a drive sleeve 21 slidably connected in the adjustment groove 18, a drive wheel 22 is rotatably connected to one end of the drive sleeve 21 extending out of the adjustment groove 18, and a drive block 23 is provided inside the adjustment groove 18 at the other end of the drive sleeve 21 away from the drive wheel 22. An elastic element 24 is connected between the end of the drive block 23 away from the drive sleeve 21 and the adjustment groove 18.

[0030] refer to Figure 6 A deflection groove 25 is provided on one side of the drive block 23. A deflection shaft 26 is fixedly connected inside the deflection groove 25. A deflection sleeve 27 is provided inside the deflection groove 25 and is rotatably connected to the deflection shaft 26. One end of the fan blade 17 shaft extends into the adjustment groove 18 and is fixedly connected to a deflection block 28. The deflection block 28 is slidably connected inside the deflection sleeve 27.

[0031] refer to Figure 2 and Figure 3 Inside the fan housing 11, a guide ring 29 is fixedly connected to the outer periphery of the rear plate 15. The inner circumference of the guide ring 29 and the position of the output port 14 are provided with a recess 210 for guiding. The drive wheel 22 in each set of angle adjustment components 2 contacts the inner circumference of the guide ring 29 under the thrust of the corresponding elastic element 24.

[0032] In actual operation, the starter motor 12 drives the rear plate 15 and the front plate 16 to rotate. During the rotation of the rear plate 15 and the front plate 16, several fan blades 17 will rotate synchronously, drawing air into the fan housing 11 through the inlet 13 and finally discharging it from the outlet 14. During the rotation of the rear plate 15, several drive blocks 23 will rotate synchronously, and under the thrust of the elastic element 24, several drive wheels 22 will roll along the inner wall of the guide ring 29.

[0033] refer to Figures 3 to 5Whenever the drive wheel 22 rolls to the recess 210, the elastic element 24 will further push the drive block 23 and drive sleeve 21 out of the adjustment groove 18. As the drive block 23 moves outward from the adjustment groove 18, it will simultaneously drive the deflection sleeve 27 to deflect in the deflection groove 25 through the deflection shaft 26, and drive the corresponding fan blade 17 to rotate through the deflection block 28 and the rotating shaft. At the same time, the deflection block 28 slides in the deflection sleeve 27, thereby increasing the angle of the fan blade 17 at the output port 14 position. This can more effectively discharge the gas entering the fan casing 11, reduce the violent eddies generated by flow separation at the output port 14, fundamentally reduce turbulent noise, make the fan run more smoothly, improve system reliability, and greatly reduce eddies and flow separation, making energy transfer more complete, thereby converting more electrical energy into wind energy and air pressure, directly improving efficiency and reducing operating power consumption.

[0034] Whenever the drive wheel 22 rolls away from the recess 210, the drive wheel 22 will push the drive sleeve 21 and the drive block 23 to move towards the inside of the adjustment groove 18. During the movement, the deflection sleeve 27 will be deflected in the deflection groove 25, and the corresponding fan blade 17 will be rotated through the deflection block 28 and the rotating shaft, so that the angle of the fan blade 17 moving away from the output port 14 will be reduced.

[0035] In summary, by adjusting the settings of component 2, the angle of the fan blade 17 rotated to the position of the output port 14 is increased, and the angle of the fan blade 17 rotated away from the position of the output port 14 is decreased. The automatic adjustment of the angle of the fan blade 17 can more effectively discharge the gas entering the fan casing 11, reduce the violent eddies caused by flow separation at the output port 14, fundamentally reduce turbulence noise, make the fan run more smoothly, improve system reliability, and reduce eddies and flow separation, so that energy transfer is more complete, thereby converting more electrical energy into wind energy and air pressure, directly improving efficiency and reducing operating power consumption.

[0036] Example 2 In actual use, when the temperature inside the fan rises due to the intake of high-temperature gas, the temperature rise will cause changes in the gas state, which can easily induce intake impact, increased flow separation, or even surge, seriously threatening the safe and stable operation of the system. Therefore, this embodiment improves the device described in the above embodiment.

[0037] refer to Figure 7 and Figure 8 The drive sleeve 21 has a sliding groove 211 on the side near the drive block 23. The end of the drive block 23 away from the elastic member 24 is fixedly connected to a piston member 212 that is slidably connected inside the sliding groove 211. Thermal expansion gas is provided inside the sliding groove 211 on the side of the piston member 212 away from the elastic member 24. A limiting plate for limiting the movement distance of the piston member 212 is fixedly connected to the outer wall of the drive block 23.

[0038] In actual operation, when the temperature inside the fan rises due to the intake of high-temperature gas, the temperature will be transferred to the sliding groove 211, causing the thermally expanding gas in the sliding groove 211 to expand. After the thermally expanding gas expands, it will push the piston 212 and the drive block 23 to move towards the inside of the adjustment groove 18. During the movement, it will simultaneously drive the deflection sleeve 27 to deflect in the deflection groove 25, and drive the corresponding fan blades 17 to rotate through the deflection block 28 and the rotating shaft, so that the angle of all fan blades 17 decreases.

[0039] It should be noted that the higher the internal temperature of the fan, the farther the thermal expansion gas pushes the piston 212 and the drive block 23 to move, and the smaller the angle of the fan blade 17 becomes. This allows the angle of the fan blade 17 to be adaptively adjusted according to the internal temperature of the fan.

[0040] In summary, through the design of structures such as the sliding groove 211 and the piston 212, when the temperature inside the fan rises due to the intake of high-temperature gas, the thermally expanding gas will push the piston 212 and the drive block 23 towards the inside of the regulating groove 18. During the movement, the deflection sleeve 27 will be deflected in the deflection groove 25, and the corresponding fan blades 17 will be rotated through the deflection block 28 and the rotating shaft. This reduces the angle of all fan blades 17, effectively reducing intake impact and flow separation losses, further reducing harmful surge phenomena, and enhancing system reliability.

[0041] Example 3 A control method for an energy-saving and noise-reducing centrifugal fan includes: When the fan blade 17 rotates to the position of the output port 14, its angle is increased by the corresponding adjustment component 2 to improve the gas discharge efficiency. When the fan blade 17 moves away from the output port 14, its angle is reduced by the corresponding adjustment component 2 to reduce the backflow resistance. When the temperature exceeds the threshold, the angle of all fan blades 17 is reduced synchronously by adjusting component 2 to suppress intake shock and surge.

[0042] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An energy-saving and noise-reducing centrifugal fan, comprising a support frame, a fan housing, a motor, an inlet, an outlet, a rear plate, and a front plate, wherein a plurality of equidistant fan blades are rotatably disposed between the rear plate and the front plate, characterized in that, Also includes: Multiple sets of adjustment components, the same number as the fan blades, are all located inside the rear disc. They are used to independently adjust the angle of the fan blades at the corresponding positions when the output ports are in relative positions, and to drive all the fan blade angles to decrease synchronously through the thermal expansion effect when the internal temperature of the fan rises.

2. The energy-saving and noise-reducing centrifugal fan according to claim 1, characterized in that: The fan housing is fixedly connected to a guide ring sleeved on the outer side of the rear disc circumference, and the inner wall of the guide ring is provided with a recessed part corresponding to the position of the output port. The outer circumferential wall of the rear disc is provided with adjustment grooves that are the same number and position as the fan blades, and multiple sets of adjustment components are respectively arranged in the corresponding adjustment grooves.

3. The energy-saving and noise-reducing centrifugal fan according to claim 1, characterized in that: The adjustment assembly includes a drive sleeve, a drive block, and an elastic element. The drive sleeve is slidably connected in the adjustment groove, and a drive wheel is rotatably connected to one end of the drive sleeve. The drive block is disposed at the other end of the drive sleeve, and the elastic element is disposed between the drive block and the inner wall of the adjustment groove.

4. The energy-saving and noise-reducing centrifugal fan according to claim 1, characterized in that: The drive wheel is configured to contact and roll against the inner wall of the guide ring, and the elastic element is used to provide the drive wheel with an elastic force that presses it against the inner wall of the guide ring.

5. The energy-saving and noise-reducing centrifugal fan according to claim 1, characterized in that: The drive block has a deflection groove, and a deflection sleeve is rotatably connected to the deflection groove via a deflection shaft. The shaft of the fan blade extends into the adjustment groove and is fixedly connected to a deflection block. The deflection block is slidably sleeved in the deflection sleeve.

6. The energy-saving and noise-reducing centrifugal fan according to claim 1, characterized in that: When the drive wheel rolls to the recessed position, the elastic element pushes the drive block to move outward from the adjustment groove, and the deflection sleeve drives the fan blade angle to increase. When the drive wheel moves away from the recessed position, the drive wheel pushes the drive block to move inward toward the adjustment groove, and the deflection sleeve causes the fan blade angle to decrease.

7. The energy-saving and noise-reducing centrifugal fan according to claim 1, characterized in that: The adjustment assembly further includes a sliding groove formed in the drive sleeve and a piston component disposed in the sliding groove. The piston component is fixedly connected to the drive block, and the sliding groove is filled with thermal expansion gas on the side of the piston component away from the drive block.

8. The energy-saving and noise-reducing centrifugal fan according to claim 1, characterized in that: When the thermally expanding gas expands due to heat, it can push the piston and the drive block to move and overcome the elastic force of the elastic element.

9. The energy-saving and noise-reducing centrifugal fan according to claim 1, characterized in that: The front and rear discs are fixed together by a support member.

10. A control method for an energy-saving and noise-reducing centrifugal fan, used to control the energy-saving and noise-reducing centrifugal fan according to any one of claims 1 to 9, characterized in that, include: When the fan blades rotate to the output position, their angle is increased by the corresponding adjustment component to improve the gas discharge efficiency. When the fan blades move away from the output port, their angle is reduced by the corresponding adjustment component to reduce the backflow resistance; When the temperature exceeds the threshold, the angle of all fan blades is reduced synchronously by adjusting the components to suppress intake shock and surge.

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