A centrifugal fan that is easy to adjust

Abstract

The utility model provides a centrifugal fan which is easy to adjust, and relates to the field of fans. The utility model comprises a shell, a motor and an impeller arranged in the shell, the motor drives the impeller to rotate, an air inlet is arranged at the front end of the shell, the air outlet of the shell is connected to a square rotating cylinder, a plurality of fixing rods are arranged at equal angles on the outer end surface of the square rotating cylinder, a bottom plate is sleeved on the fixing rod, a plurality of fan-shaped ventilation holes 1 are arranged at equal angles on the circumference of the bottom plate, a rotating plate is rotatably connected to the bottom plate, a plurality of fan-shaped ventilation holes 2 are arranged at equal angles on the circumference of the rotating plate, a wind shielding area is formed between adjacent fan-shaped ventilation holes 2, an arc-shaped through groove is arranged radially outwardly of the fan-shaped ventilation hole 2, the arc-shaped through groove is slidably connected to the fixing rod, and also comprises a rotating drive mechanism and a controller, the rotating drive mechanism is arranged on the rotating plate, the rotating drive mechanism is electrically connected to the controller, drives the rotating plate to rotate, opens and closes the size of the ventilation hole 1, and thereby adjusts the size of the air outlet to meet the air volume adjustment needs in different occasions.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, in particular to a centrifugal fan which is easy to adjust. Background Art

[0002] A centrifugal fan generally includes a fan casing, a motor and an impeller. A motor is provided at the rear end of the fan casing. The impeller is arranged in the fan casing and is connected to the output shaft of the motor. During operation, the output shaft of the motor drives the rear cover of the impeller to rotate, the rear cover drives the blades to rotate, and the blades drive the front cover to rotate, thereby realizing the rotation of the entire impeller and achieving the purpose of exhausting gas.

[0003] However, the diameter of the existing centrifugal fan outlet is fixed, resulting in the inability to adjust the air volume, which cannot meet the needs of air volume adjustment in different occasions; at the same time, when the centrifugal fan is not in use, the air outlet is open, which is easy for water vapor to enter and corrode the internal parts. Therefore, this case is born. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the utility model provides a centrifugal fan that is easy to adjust, which solves the problems raised in the above-mentioned background technology.

[0006] (II) Technical solution

[0007] To achieve the above purpose, the utility model is implemented through the following technical solutions: a centrifugal fan that is easy to adjust, including a shell, a motor, and an impeller. The impeller is rotatably arranged in the shell, the motor is arranged at the rear end of the shell, the output shaft of the motor is connected to the impeller, the motor drives the impeller to rotate, and an air inlet is arranged at the front end of the shell: the air outlet of the shell is connected to the square rotating cylinder, and a plurality of fixing rods are arranged at equal angles on the outer end surface of the square rotating cylinder. A bottom plate is sleeved on the fixing rod, and a plurality of fan-shaped ventilation holes 1 are opened at equal angles on the circumference of the bottom plate. A rotating plate is rotatably connected to the bottom plate, and a plurality of fan-shaped ventilation holes 2 are opened at equal angles on the circumference of the rotating plate. There is a wind shielding area between the adjacent fan-shaped ventilation holes 2, and an arc-shaped through groove is arranged on the radial outer side of the fan-shaped ventilation hole 2, and the arc-shaped through groove is slidably connected to the fixing rod. It also includes a rotation drive mechanism and a controller, and the rotation drive mechanism is arranged on the rotating plate, and the rotation drive mechanism is electrically connected to the controller to drive the rotating plate to rotate and open and close the size of the ventilation hole 1.

[0008] Preferably, the rotation drive mechanism includes a driving gear, a driven gear, and a driving motor. The driving motor is arranged on the outer side wall of the square rotating cylinder. The output shaft of the driving motor is connected to the center of the driving gear. The driving gear is meshed with the driven gear. The driven gear is arranged at the outer end of the rotating plate.

[0009] Preferably, a connecting shaft is provided at the center of the base plate, and a connecting hole is opened at the center of the corresponding rotating plate. The connecting hole is sleeved on the connecting shaft, and the outer end of the connecting shaft is fixed by a nut. A gap is left between the nut and the rotating plate to ensure the rotation of the rotating plate.

[0010] Preferably, the area of ​​the fan-shaped ventilation hole is consistent with the area of ​​the wind shielding area.

[0011] Preferably, the area of ​​the second fan-shaped ventilation hole is consistent with that of the first fan-shaped ventilation hole, and they are concentrically arranged.

[0012] Preferably, the number of the fan-shaped ventilation holes 1 and the number of the fan-shaped ventilation holes 2 are both three.

[0013] Preferably, it further comprises a coupling and a reduction box, the output end of the motor is connected to the coupling, the coupling is connected to the reduction box, and the output end of the reduction box is connected to the center of the impeller.

[0014] (III) Beneficial effects

[0015] The utility model provides a centrifugal fan which is easy to adjust and has the following beneficial effects:

[0016] The centrifugal fan which is easy to adjust is provided with a bottom plate at the air outlet of a shell, fan-shaped ventilation holes one are provided at equal angles on the circumference of the bottom plate, a rotating plate is rotatably connected to the bottom plate, fan-shaped ventilation holes two are provided at equal angles on the circumference of the rotating plate, and the size of the fan-shaped ventilation holes one is opened and closed by rotating the rotating plate, thereby adjusting the size of the air outlet to meet the air volume adjustment needs in different occasions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of a centrifugal fan structure that is easy to adjust in the utility model. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of a centrifugal fan structure that is easy to adjust in the utility model. Figure 2 ;

[0019] Figure 3 This is a schematic diagram of the structure of the square rotating cylinder, bottom plate and rotating plate of the utility model;

[0020] Figure 4 This is a schematic diagram of the bottom plate and rotating plate structure of the utility model.

[0021] In the figure: 1. casing; 2. motor; 3. impeller; 4. air inlet; 6. square rotating cylinder; 7. fixing rod; 8. bottom plate; 9. fan-shaped ventilation hole 1; 10. rotating plate; 11. fan-shaped ventilation hole 2; 12. wind shielding area; 13. arc-shaped through groove; 14. driving gear; 15. driven gear; 16. driving motor; 17. connecting shaft; 18. connecting hole; 19. nut; 20. coupling; 21. reduction box. DETAILED DESCRIPTION

[0022] The utility model provides a centrifugal fan which is easy to adjust. Figure 1-4 As shown, it includes a housing 1, a motor 2, and an impeller. The impeller is rotatably arranged in the housing 1. The motor 2 is arranged at the rear end of the housing 1. The output shaft of the motor 2 is connected to the impeller. The motor 2 drives the impeller to rotate. The front end of the housing 1 is provided with an air inlet 4: the air outlet of the housing 1 is connected to a square rotating cylinder 6. A plurality of fixing rods 7 are arranged at equal angles on the outer end surface of the square rotating cylinder 6. A bottom plate 8 is sleeved on the fixing rod 7. A plurality of fan-shaped ventilation holes 9 are arranged at equal angles on the circumference of the bottom plate 8. The bottom plate 8 is rotatably connected to A rotating plate 10, wherein a plurality of fan-shaped ventilation holes 11 are provided at equal angles on the circumference of the rotating plate 10, and a wind shielding area 12 is provided between the adjacent fan-shaped ventilation holes 11, and an arc-shaped through groove 13 is provided on the radial outer side of the fan-shaped ventilation holes 11, and the arc-shaped through groove 13 is slidably connected to the fixed rod 7, and further comprises a rotation driving mechanism and a controller, wherein the rotation driving mechanism is provided on the rotating plate 10, and the rotation driving mechanism is electrically connected to the controller to drive the rotating plate 10 to rotate, open and close the size of the ventilation hole 1, and thereby adjust the air volume. The square rotating cylinder 6 and the housing 1 can be integrally formed, or they can be separately assembled and connected, and fixedly connected by bolts, and the attached figure shows the separately assembled connection mode.

[0023] The rotation driving mechanism in the embodiment of this case includes a driving gear 14, a driven gear 15, and a driving motor 162. The driving motor 162 is arranged on the outer wall of the square rotating cylinder 6. The output shaft of the driving motor 162 is connected to the center of the driving gear 14. The driving gear 14 is meshed with the driven gear 15. The driven gear 15 is arranged at the outer end of the rotating plate 10.

[0024] like Figure 4 As shown, in order to prevent the rotating plate 10 from moving in the axial direction, a connecting shaft is arranged at the center of the base plate 8, and an external thread is opened at the outer end of the connecting shaft. Correspondingly, a connecting hole 18 is opened at the center of the rotating plate 10, and the connecting hole is sleeved on the connecting shaft. The outer end of the connecting shaft is fixed by a nut 19, and a gap is left between the nut 19 and the rotating plate 10 to ensure the rotation of the rotating plate 10.

[0025] In the embodiment of the present case, the area of ​​the fan-shaped ventilation hole 1 9 is consistent with that of the wind shielding area 12 , and the area of ​​the fan-shaped ventilation hole 2 11 is consistent with that of the fan-shaped ventilation hole 1 9 , and they are concentrically arranged.

[0026] The number of the fan-shaped ventilation holes 1 9 can be multiple, such as 6 equal parts, 12 equal parts. In the embodiment of this case, the number of the fan-shaped ventilation holes 1 9 and the number of the fan-shaped ventilation holes 2 11 are both three.

[0027] like Figure 2 As shown, the centrifugal fan further includes a coupling 20 and a reduction box 21. The output end of the motor 2 is connected to the coupling 20, the coupling 20 is connected to the reduction box 21, and the output end of the reduction box 21 is connected to the center of the impeller.

[0028] The motor 2, coupling 20, reduction box 21 and controller in the embodiment of this case are all existing technologies, and the specific models are configured and purchased according to actual needs.

[0029] Working principle: When the centrifugal fan that is easy to adjust is used, the motor 2 is started, and the motor 2 drives the impeller to rotate through the coupling 20 and the reduction box 21, forming a negative pressure in the housing 1, driving the air to be discharged from the air inlet 4 to the air outlet. During the exhaust process, the controller controls the drive motor 162 to start according to the required air volume. Figure 1 As shown, it is the maximum air flow state. At this time, the fan-shaped ventilation hole 1 9 and the fan-shaped ventilation hole 2 11 are completely connected, the air flow is maximum, the driving gear 14 rotates clockwise, driving the driven gear 15 to rotate counterclockwise, as shown in FIG. Figure 3 As shown, in order to reduce the air volume, the arc groove slides counterclockwise on the fixed rod 7, and the wind shielding area 12 of the rotating plate 10 shields part of the fan-shaped ventilation hole 9, as shown in FIG. Figure 2 As shown, the motor 2 is stopped and the air outlet is closed. At this time, the wind shielding area 12 of the rotating plate 10 completely blocks the fan-shaped ventilation hole 9 to prevent water vapor from entering and corroding the internal parts.

[0030] In summary, the centrifugal fan which is easy to adjust is provided with a base plate 8 at the air outlet of the shell 1, fan-shaped ventilation holes 9 are provided at equal angles on the circumference of the base plate 8, and a rotating plate 10 is rotatably connected to the base plate 8, and fan-shaped ventilation holes 11 are provided at equal angles on the circumference of the rotating plate 10. By rotating the rotating plate 10, the controller controls the rotating driving mechanism to open and close the size of the fan-shaped ventilation holes 9, thereby adjusting the size of the air outlet to meet the air volume adjustment needs in different occasions.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A centrifugal fan that is easy to adjust, comprising a housing (1), a motor (2), and an impeller (3), wherein the impeller (3) is rotatably arranged in the housing (1), the motor (2) is arranged at the rear end of the housing (1), the output shaft of the motor (2) is connected to the impeller (3), the motor (2) drives the impeller (3) to rotate, and the front end of the housing (1) is provided with an air inlet (4), characterized in that: The air outlet of the shell (1) is connected to a square rotating cylinder (6), a plurality of fixed rods (7) are arranged at equal angles on the outer end surface of the square rotating cylinder (6), a bottom plate (8) is sleeved on the fixed rod (7), a plurality of fan-shaped ventilation holes (9) are opened at equal angles on the circumference of the bottom plate (8), a rotating plate (10) is rotatably connected to the bottom plate (8), a plurality of fan-shaped ventilation holes (11) are opened at equal angles on the circumference of the rotating plate (10), a wind shielding area (12) is provided between adjacent fan-shaped ventilation holes (11), an arc-shaped through groove (13) is arranged on the radial outer side of the fan-shaped ventilation hole (11), the arc-shaped through groove (13) is slidably connected to the fixed rod (7), and also includes a rotation drive mechanism and a controller, the rotation drive mechanism is arranged on the rotating plate (10), the rotation drive mechanism is electrically connected to the controller, drives the rotating plate (10) to rotate, and opens and closes the size of the ventilation hole (9).

2. The centrifugal fan that is easy to adjust according to claim 1, characterized in that: The rotation driving mechanism comprises a driving gear (14), a driven gear (15), and a driving motor (16); the driving motor (16) is arranged on the outer wall of the square rotating cylinder (6); the output shaft of the driving motor (16) is centrally connected to the driving gear (14); the driving gear (14) is meshed with the driven gear (15); and the driven gear (15) is arranged at the outer end of the rotating plate (10).

3. The centrifugal fan that is easy to adjust according to claim 1 is characterized in that: A connecting shaft (17) is arranged at the center of the bottom plate (8), and a connecting hole (18) is opened at the center of the corresponding rotating plate (10). The connecting hole (18) is sleeved on the connecting shaft (17). The outer end of the connecting shaft (17) is fixed by a nut (19). A gap is left between the nut (19) and the rotating plate (10) to ensure the rotation of the rotating plate (10).

4. The centrifugal fan that is easy to adjust according to claim 1 is characterized in that: The area of ​​the fan-shaped ventilation hole 1 (9) is consistent with the area of ​​the wind shielding area (12).

5. The centrifugal fan that is easy to adjust according to claim 4, characterized in that: The area of ​​the second fan-shaped ventilation hole (11) is consistent with that of the first fan-shaped ventilation hole (9), and they are concentrically arranged.

6. The easily adjustable centrifugal fan according to claim 5, characterized in that: The number of the fan-shaped ventilation holes one (9) and the number of the fan-shaped ventilation holes two (11) are both three.

7. The easily adjustable centrifugal fan according to claim 1, characterized in that: It also includes a coupling (20) and a reduction box (21), wherein the output end of the motor (2) is connected to the coupling (20), the coupling (20) is connected to the reduction box (21), and the output end of the reduction box (21) is connected to the center of the impeller (3).

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