Noise reduction type high-speed centrifugal fan

Abstract

The utility model relates to the technical field of centrifugal fans, in particular to a noise reduction type high-speed centrifugal fan which comprises a driving motor. The device further comprises a rear disc, a connecting block, a front disc, an adjusting ring groove, a limiting arc groove, a hollow block, blades, a spring, a limiting rod and a limiting arc block. The rear disc is arranged on the front side of the driving motor. The two limiting arc blocks are pressed towards the interior of the hollow block at the same time, so that the two limiting arc blocks are separated from the interiors of the limiting arc grooves at the same time, the spring is extruded, then the hollow block is pushed to move along the track of the adjusting ring groove, and the hollow block drives the blades to move; at the moment, the ends, away from the springs, of the limiting arc blocks slide in the adjusting ring groove, and when the limiting arc blocks reach the next limiting arc groove, the limiting arc blocks are pushed to move in the direction of the limiting arc grooves through the characteristics of the springs till the limiting arc blocks are inserted into the limiting arc grooves again, so that the positions of the blades are fixed; and the function of adjusting the distance between the blades is achieved.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal fan technology, and in particular to a noise-reducing high-speed centrifugal fan. Background Technology

[0002] Centrifugal fans operate on the principle of converting kinetic energy into potential energy. During normal operation, the impeller is driven by the motor to rotate inside the volute. Air enters from the center of the impeller through the inlet chamber. Due to the centrifugal force of the rotating blades, the gas gains energy, and the gas pressure and velocity increase rapidly. Under the action of centrifugal force, the gas is thrown along the blade passage towards the casing and discharged from the outlet of the volute. The spacing between the blades affects the friction of the blade surface, thereby reducing the efficiency of the fan. An unreasonable design of the blade spacing can also affect the noise level of the fan. Therefore, it is necessary to adjust the blade spacing appropriately in actual use.

[0003] Common high-speed centrifugal fans only have the function of blowing air. They can use the centrifugal force of the rotating blades to give energy to the gas, and the gas pressure and speed will increase rapidly. Under the action of centrifugal force, the gas is thrown along the blade passage towards the casing and discharged from the air outlet of the volute. However, they lack the function of adjusting the blade spacing, which cannot guarantee the efficiency and noise level of the fan. An unreasonable design of the blade spacing can affect the friction of the blade surface, reduce the efficiency of the fan, and also affect the noise level of the fan.

[0004] Therefore, to address the lack of blade spacing adjustment function in the aforementioned high-speed centrifugal fans, a noise-reducing high-speed centrifugal fan can be designed. By simultaneously pressing two limiting arc blocks into the interior of a hollow block, the two limiting arc blocks disengage from the limiting arc grooves. The spring is then compressed, pushing the hollow block along the trajectory of the adjusting ring groove. The hollow block, in turn, moves the blades. At this time, the end of the limiting arc block away from the spring slides inside the adjusting ring groove. When the limiting arc block reaches the next limiting arc groove, the spring's characteristics push the limiting arc block towards the limiting arc groove until the limiting arc block re-inserts into the limiting arc groove, thereby fixing the blade position and realizing the blade spacing adjustment function. Utility Model Content

[0005] To overcome the common problem that high-speed centrifugal fans lack blade spacing adjustment function, which makes it impossible to guarantee fan efficiency and noise level, unreasonable blade spacing design can easily affect blade surface friction, reduce fan efficiency, and also affect fan noise level.

[0006] The technical solution of this utility model is as follows: a noise-reducing high-speed centrifugal fan, including a drive motor; it also includes a rear plate, connecting blocks, a front plate, adjusting ring grooves, limiting arc grooves, hollow blocks, blades, springs, limiting rods, and limiting arc blocks. The rear plate is provided on the front side of the drive motor. Four connecting blocks are equally spaced at the center of the rear plate. The front plate is provided on the front side of the connecting blocks. Adjusting ring grooves are symmetrically opened on the side of the rear plate and the front plate near the connecting blocks. Several limiting arc grooves are symmetrically opened at equal intervals on the side of the rear plate and the front plate away from the connecting blocks, corresponding to the position of the adjusting ring grooves. Several hollow blocks are equally spaced between the rear plate and the front plate, corresponding to the position of the adjusting ring grooves. Blades are provided on the side of the hollow blocks away from the connecting blocks. Springs are provided inside the hollow blocks. Two limiting rods are symmetrically arranged on the upper and lower sides of the middle of the hollow block. The end of the limiting rod near the spring is welded to the spring. Two limiting arc blocks are symmetrically arranged on the left and right ends of the spring. The end of the limiting arc block away from the spring passes through the adjusting ring groove and is inserted into the interior of the limiting arc groove.

[0007] Preferably, by simultaneously pressing two limiting arc blocks into the hollow block, the two limiting arc blocks disengage from the limiting arc grooves at the same time. The spring is then compressed, pushing the hollow block to move along the trajectory of the adjusting ring groove. The hollow block then drives the blades to move. At this time, the end of the limiting arc block away from the spring slides inside the adjusting ring groove. When the limiting arc block reaches the next limiting arc groove, the characteristics of the spring push the limiting arc block to move towards the limiting arc groove until the limiting arc block re-inserts into the limiting arc groove, thereby fixing the position of the blades and realizing the function of blade spacing adjustment. This solves the problem of common high-speed centrifugal fans that only have the function of blowing air. They can use the centrifugal force of the rotating blades to give the gas energy, and the gas pressure and speed can be rapidly increased. Under the action of centrifugal force, the gas is thrown along the blade passage towards the casing and discharged from the volute outlet. However, they lack the function of blade spacing adjustment, which cannot guarantee the efficiency and noise level of the fan. An unreasonable design of the blade spacing can affect the friction of the blade surface, reduce the efficiency of the fan, and also affect the noise level of the fan.

[0008] Preferably, the rear and front discs are provided with volutes, and the output end of the drive motor at the front of the drive motor passes through the volutes and connects to the rear and front discs.

[0009] Preferably, the output end at the bottom of the volute is connected to a wide-mouth air outlet frame, and a fixing frame is provided at the bottom of the wide-mouth air outlet frame.

[0010] As a preferred embodiment, four air inlet slots are evenly spaced at the center of the front side of the front disc, and an air inlet sound insulation guide cover is provided on the front side of the volute corresponding to the position of the air inlet slots.

[0011] Preferably, a mounting base is provided at the bottom of the drive motor corresponding to the position of the volute, and four L-shaped support rods are symmetrically arranged at the four corners of the bottom of the mounting base.

[0012] Preferably, the bottom of the four L-shaped support rods is provided with a base, and the top of the base is provided with a limit frame corresponding to the position of the four L-shaped support rods.

[0013] Preferably, two L-shaped connecting rods are symmetrically arranged at the left and right ends of the front top of the base, and the volute is fixed to the two L-shaped connecting rods by bolts.

[0014] The beneficial effects of this utility model are:

[0015] 1. By simultaneously pressing two limiting arc blocks into the hollow block, the two limiting arc blocks disengage from the limiting arc grooves. The spring is then compressed, pushing the hollow block along the trajectory of the adjusting ring groove. The hollow block, in turn, moves the blades. At this time, the end of the limiting arc block away from the spring slides inside the adjusting ring groove. When the limiting arc block reaches the next limiting arc groove, the spring's characteristics push the limiting arc block towards the limiting arc groove until it re-inserts into the limiting arc groove, thus fixing the blade position and achieving the function of blade spacing adjustment. This addresses the common problem of high-speed centrifugal fans that only have the function of blowing air. They can use the centrifugal force of the rotating blades to give the gas energy, rapidly increasing the gas pressure and speed. Under the action of centrifugal force, the gas is thrown along the blade passage towards the casing and discharged from the volute outlet. However, they lack the function of blade spacing adjustment, which cannot guarantee the fan efficiency and noise level. An unreasonable blade spacing design can affect the friction of the blade surface, reduce the fan efficiency, and also affect the fan noise level. Attached Figure Description

[0016] Figure 1 The diagram shown is a rear view of the overall structure of a noise-reducing high-speed centrifugal fan according to this utility model.

[0017] Figure 2 The diagram shown is a structural schematic of a noise-reducing high-speed centrifugal fan impeller assembly according to this utility model.

[0018] Figure 3 The diagram shown is a front view of the rear disc structure of a noise-reducing high-speed centrifugal fan according to this utility model.

[0019] Figure 4 The diagram shown is a rear view of the front disc structure of a noise-reducing high-speed centrifugal fan according to this utility model.

[0020] Figure 5 The diagram shown is a front view of the volute of a noise-reducing high-speed centrifugal fan according to this utility model.

[0021] Figure 6 The diagram shown is a structural schematic of a noise-reducing high-speed centrifugal fan support according to this utility model.

[0022] Figure 7The diagram shown is a schematic diagram of the limiting arc block structure of a noise-reducing high-speed centrifugal fan according to this utility model.

[0023] Explanation of reference numerals in the attached drawings: 1. Drive motor; 2. Rear plate; 3. Connecting block; 4. Front plate; 5. Adjusting ring groove; 6. Limiting arc groove; 7. Hollow block; 8. Blade; 9. Spring; 10. Limiting rod; 11. Limiting arc block; 12. Air inlet slot; 13. Volute; 14. Air inlet sound insulation guide shroud; 15. Wide-mouth air outlet frame; 16. Fixing frame; 17. Mounting base; 18. L-shaped support rod; 19. Limiting frame; 20. Base; 21. L-shaped connecting rod. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Please see Figures 1-7This utility model provides an embodiment: a noise-reducing high-speed centrifugal fan, including a drive motor 1; it also includes a rear plate 2, a connecting block 3, a front plate 4, an adjusting ring groove 5, a limiting arc groove 6, a hollow block 7, blades 8, a spring 9, a limiting rod 10, and a limiting arc block 11. The rear plate 2 is arranged in front of the drive motor 1, and four connecting blocks 3 are evenly spaced at the center of the rear plate 2. The front plate 4 is arranged in front of the connecting blocks 3. Adjusting ring grooves 5 are symmetrically opened on the side of the rear plate 2 and the front plate 4 near the connecting blocks 3, and the side of the rear plate 2 and the front plate 4 away from the connecting blocks 3 corresponds to the adjusting ring groove. Several limiting arc grooves 6 are symmetrically and evenly spaced at positions 5. Several hollow blocks 7 are equally spaced at positions corresponding to the adjusting ring grooves 5 between the rear plate 2 and the front plate 4. A blade 8 is provided on the side of the hollow block 7 away from the connecting block 3. A spring 9 is installed inside the hollow block 7. Two limiting rods 10 are symmetrically arranged on the upper and lower sides of the middle of the hollow block 7. The end of the limiting rod 10 near the spring 9 is welded to the spring 9. Two limiting arc blocks 11 are symmetrically arranged on the left and right ends of the spring 9. The end of the limiting arc block 11 away from the spring 9 passes through the adjusting ring groove 5 and is inserted into the limiting arc groove 6. By simultaneously pressing the two limiting arc blocks 11 into the hollow block 7, the two limiting arc blocks 11 disengage from the limiting arc groove 6 at the same time. The spring 9 is then compressed, pushing the hollow block 7 to move along the trajectory of the adjusting ring groove 5. The hollow block 7 then drives the blade 8 to move. At this time, the end of the limiting arc block 11 away from the spring 9 slides inside the adjusting ring groove 5. When the limiting arc block 11 reaches the next limiting arc groove 6, the characteristics of the spring 9 push the limiting arc block 11 to move towards the limiting arc groove 6 until the limiting arc block 11 re-inserts into the limiting arc groove 6. Internally, this is used to fix the position of the blades 8, realizing the function of adjusting the spacing of the blades 8. This solves the problem of common high-speed centrifugal fans that only have the function of blowing air. They can use the centrifugal force of the rotating blades 8 to give the gas energy, and the gas pressure and speed will increase rapidly. Under the action of centrifugal force, the gas is thrown along the blade passage towards the casing and discharged from the air outlet of the volute 13. However, they lack the function of adjusting the spacing of the blades 8, which cannot guarantee the efficiency and noise level of the fan. An unreasonable design of the spacing of the blades 8 can affect the friction on the surface of the blades 8, reduce the efficiency of the fan, and also affect the noise level of the fan.

[0026] Please see Figures 2-7In this embodiment, a mounting base 17 is provided at the bottom of the drive motor 1 corresponding to the position of the volute 13. Four L-shaped support rods 18 are symmetrically arranged at the four corners of the bottom of the mounting base 17. A base 20 is provided at the bottom end of the four L-shaped support rods 18. A limit frame 19 is provided at the top of the base 20 corresponding to the position of the four L-shaped support rods 18. Two L-shaped connecting rods 21 are symmetrically arranged at the left and right ends of the front side of the top of the base 20. The volute 13 is fixed to the two L-shaped connecting rods 21 by bolts. When the drive motor 1 is started, the drive motor 1 drives the rear plate 2 and the front plate 4 to rotate through the output end. The rear plate 2 and the front plate 4 drive the blades 8 between them to rotate through the hollow block 7. Air enters from the center of the impeller through the air inlet slot 12. Due to the centrifugal force of the rotating blades 8, the gas gains energy, and the gas pressure and speed increase rapidly. Under the action of centrifugal force, the gas is thrown along the blade passage towards the volute 13 and finally discharged from the wide-mouth air outlet frame 15 at the bottom of the volute 13.

[0027] Please see Figures 1-7 In this embodiment, a volute 13 is provided on the outside of the rear disc 2 and the front disc 4. The output end of the drive motor 1 passes through the volute 13 and is connected to the rear disc 2 and the front disc 4. The output end at the bottom of the volute 13 is connected to a wide-mouth air outlet frame 15. A fixing frame 16 is provided at the bottom of the wide-mouth air outlet frame 15. Four air inlet slots 12 are evenly spaced at the center of the front side of the front disc 4. An air inlet sound insulation guide shroud 14 is provided on the front side of the volute 13 corresponding to the position of the air inlet slots 12. When it is necessary to adjust the spacing of the blades 8 according to actual usage requirements, by simultaneously pressing two limiting arc blocks 11 into the interior of the hollow block 7, the two limiting arc blocks 11 are simultaneously disengaged from the interior of the limiting arc groove 6, and springing... Spring 9 is compressed, which pushes hollow block 7 to move along the trajectory of adjusting ring groove 5. Hollow block 7 then drives blade 8 to move. At this time, the end of limiting arc block 11 away from spring 9 slides inside adjusting ring groove 5. When limiting arc block 11 reaches the next limiting arc groove 6, the characteristics of spring 9 push limiting arc block 11 to move towards limiting arc groove 6 until limiting arc block 11 is inserted into limiting arc groove 6 again, thereby fixing the position of blade 8 and realizing the function of adjusting blade spacing. This prevents unreasonable design of blade spacing from affecting the friction of blade surface, reducing fan efficiency, and affecting fan noise level.

[0028] During operation, the drive motor 1 is started, which drives the rear disc 2 and the front disc 4 to rotate via its output end. The rear disc 2 and the front disc 4, in turn, drive the blades 8 between them to rotate via the hollow block 7. Air enters from the center of the impeller through the air inlet slot 12. Due to the centrifugal force of the rotating blades 8, the gas gains energy, and the gas pressure and velocity increase rapidly. Under the action of centrifugal force, the gas is thrown along the blade passage towards the volute 13 and finally discharged from the wide-mouth air outlet frame 15 at the bottom of the volute 13. When it is necessary to adjust the spacing of the blades 8 according to actual usage requirements, the two limiting arc blocks 1 are pressed simultaneously into the interior of the hollow block 7. 1. This causes the two limiting arc blocks 11 to simultaneously disengage from the inside of the limiting arc groove 6, and the spring 9 is compressed. Then, it pushes the hollow block 7 to move along the trajectory of the adjusting ring groove 5. The hollow block 7 then drives the blade 8 to move. At this time, the end of the limiting arc block 11 away from the spring 9 slides inside the adjusting ring groove 5. When the limiting arc block 11 reaches the next limiting arc groove 6, the characteristics of the spring 9 push the limiting arc block 11 to move towards the limiting arc groove 6 until the limiting arc block 11 is inserted into the inside of the limiting arc groove 6 again. This fixes the position of the blade 8 and realizes the function of adjusting the blade spacing.

[0029] Through the above steps, by simultaneously pressing the two limiting arc blocks 11 into the hollow block 7, the two limiting arc blocks 11 are simultaneously disengaged from the inside of the limiting arc groove 6. The spring 9 is then compressed, pushing the hollow block 7 to move along the trajectory of the adjusting ring groove 5. The hollow block 7 then drives the blade 8 to move. At this time, the end of the limiting arc block 11 away from the spring 9 slides inside the adjusting ring groove 5. When the limiting arc block 11 reaches the next limiting arc groove 6, the characteristics of the spring 9 push the limiting arc block 11 to move towards the limiting arc groove 6 until the limiting arc block 11 re-inserts into the limiting arc groove 6. The interior of the slot 6 is used to fix the position of the blades 8, realizing the function of adjusting the spacing of the blades 8. This solves the problem of common high-speed centrifugal fans that only have the function of blowing air. They can use the centrifugal force of the rotating blades 8 to give the gas energy, and the gas pressure and speed will increase rapidly. Under the action of centrifugal force, the gas is thrown along the blade passage towards the casing and discharged from the air outlet of the volute 13. However, they lack the function of adjusting the spacing of the blades 8, which cannot guarantee the efficiency and noise level of the fan. An unreasonable design of the spacing of the blades 8 can affect the friction of the surface of the blades 8, reduce the efficiency of the fan, and also affect the noise level of the fan.

Claims

1. A noise-reducing high-speed centrifugal fan, comprising a drive motor (1); characterized in that: It also includes a rear plate (2), a connecting block (3), a front plate (4), an adjusting ring groove (5), a limiting arc groove (6), a hollow block (7), a blade (8), a spring (9), a limiting rod (10), and a limiting arc block (11). The front plate (2) is provided on the front side of the drive motor (1). Four connecting blocks (3) are equally spaced in the center of the rear plate (2). The front plate (4) is provided on the front side of the connecting blocks (3). The adjusting ring groove (5) is symmetrically opened on the side of the rear plate (2) and the front plate (4) near the connecting blocks (3). The limiting arc groove (5) is symmetrically opened on the side of the rear plate (2) and the front plate (4) away from the connecting blocks (3) at equal intervals. Several arc grooves (6) are provided. Hollow blocks (7) are provided at equal intervals between the rear plate (2) and the front plate (4) corresponding to the position of the adjusting ring groove (5). A blade (8) is provided on the side of the hollow block (7) away from the connecting block (3). A spring (9) is provided inside the hollow block (7). Two limit rods (10) are symmetrically provided on the upper and lower sides of the middle of the hollow block (7). The end of the limit rod (10) close to the spring (9) is welded to the spring (9). Two limit arc blocks (11) are symmetrically provided on the left and right ends of the spring (9). The end of the limit arc block (11) away from the spring (9) passes through the adjusting ring groove (5) and is inserted into the interior of the limit arc groove (6).

2. The noise-reducing high-speed centrifugal fan according to claim 1, characterized in that: The rear disc (2) and the front disc (4) are provided with a volute (13), and the output end of the drive motor (1) on the front side passes through the volute (13) and is connected to the rear disc (2) and the front disc (4).

3. The noise-reducing high-speed centrifugal fan according to claim 2, characterized in that: The bottom of the volute (13) is connected to a wide-mouth air outlet frame (15), and a fixed frame (16) is provided at the bottom of the wide-mouth air outlet frame (15).

4. A noise-reducing high-speed centrifugal fan according to claim 3, characterized in that: The front disc (4) has four air inlet slots (12) at equal intervals on the center of the front side, and the front side of the volute (13) is provided with an air inlet sound insulation guide hood (14) corresponding to the position of the air inlet slots (12).

5. A noise-reducing high-speed centrifugal fan according to claim 4, characterized in that: A mounting base (17) is provided at the bottom of the drive motor (1) corresponding to the position of the volute (13). Four L-shaped support rods (18) are symmetrically arranged at the four corners of the bottom of the mounting base (17).

6. A noise-reducing high-speed centrifugal fan according to claim 5, characterized in that: The bottom of the four L-shaped support rods (18) is provided with a base (20), and the top of the base (20) is provided with a limit frame (19) corresponding to the position of the four L-shaped support rods (18).

7. A noise-reducing high-speed centrifugal fan according to claim 6, characterized in that: Two L-shaped connecting rods (21) are symmetrically arranged on the left and right ends of the top front side of the base (20), and the volute (13) is fixed to the two L-shaped connecting rods (21) by bolts.

Images