Blade deflection angle adjusting device of axial flow fan

Abstract

A blade deflection angle adjusting device of an axial flow fan comprises a shaft sleeve (4) fixedly connected to a rotating shaft (3) of a motor, a plurality of mandrels (7) are symmetrically and fixedly connected to the outer circle of the shaft sleeve in the radial direction, the mandrels are sleeved with driven bevel gears (12), the driven bevel gears are provided with sleeves (10) extending outwards, and annular grooves (8) are formed in the middles of the mandrels. A limiting pin (11) penetrates through the sleeve wall of the sleeve to be inserted into the annular groove, the outer end of the sleeve is fixedly connected with a blade (5), a small-diameter shaft (15) is arranged at the end of the rotating shaft in a contracting and extending mode, a driving bevel gear (13) is sleeved on the small-diameter shaft, and a nut (14) for locking the driving bevel gear is screwed on the small-diameter shaft. The utility model has the beneficial effects that when the deflection angle of the blade is adjusted, the nut is loosened, the driving bevel gear or the driven bevel gear is rotated to deflect the blade, and the nut is tightened after the deflection of the blade meets the requirement. The deflection angle of the fan blade is convenient to adjust, and the deflection angle can be adjusted in a stepless mode.

Description

Technical Field

[0001] This utility model relates to a blade deflection angle adjustment device for an axial flow fan. Background Technology

[0002] In practical engineering, the flow rate of fans needs to be frequently adjusted according to external demands. Changing the deflection angle of the fan blades can regulate the flow rate. In existing technology, the structure for adjusting the deflection angle of fan blades includes a connecting sleeve. One end of the connecting sleeve is a sleeve, and the other end of the sleeve extends radially to a disc. The sleeve is connected to a rotating shaft, and the disc is connected to the blade. A shim with a certain angle is inserted between the disc and the blade. When the blade angle needs to be adjusted, the blade is removed and a shim with a different angle is replaced to achieve the adjustment of the blade angle.

[0003] The deflection angle of this type of blade is inconvenient to adjust, and it cannot be infinitely adjusted. Utility Model Content

[0004] To facilitate the adjustment of the blade deflection angle of a fan and to achieve stepless adjustment of the deflection angle, this utility model proposes a blade deflection angle adjustment device for an axial flow fan.

[0005] The technical solution of this utility model is a blade deflection angle adjustment device for an axial flow fan, which includes a bushing 4 fixedly connected to the rotating shaft 3 of a motor. The bushing is characterized in that multiple spindles 7 are fixedly connected radially symmetrically on the outer circle of the bushing, a driven bevel gear 12 is sleeved on the spindle, the driven bevel gear 12 has an outwardly extending sleeve 10, the middle part of the spindle has an annular groove 8, a limiting pin 11 passes through the cylinder wall of the sleeve 10 and is inserted into the annular groove 8, the outer end of the sleeve is fixedly connected to the blade 5, and the end of the rotating shaft 3 has a small diameter shaft 15 that extends inward, a driving bevel gear 13 is sleeved on the small diameter shaft, and a nut 14 is screwed on the small diameter shaft to lock the driving bevel gear 13.

[0006] When adjusting the blade deflection angle, loosen the nut, then rotate the drive bevel gear or driven bevel gear to deflect the blade. Once the blade deflection meets the requirements, tighten the nut.

[0007] The beneficial effect of this utility model is that it can conveniently adjust the deflection angle of the fan blades, and the deflection angle can be adjusted steplessly. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of the present invention.

[0009] Figure 2 for Figure 1 A magnified view of section C.

[0010] The attached diagram is labeled as follows: 1-Firming plate, 2-Motor motor, 3-Shaft, 4-Sleeve, 5-Blade, 6-Outer shell, 7-Mandrel, 8-Annular groove, 9-Closed end, 10-Sleeve, 11-Limit pin, 12-Driven bevel gear, 13-Driven bevel gear, 14-Nut, 15-Small diameter shaft. Detailed Implementation

[0011] An axial flow fan blade deflection angle adjustment device includes blades 5, which are connected to the rotating shaft 3 of a motor 2 via an angle adjustment device. The casing of the motor 2 is connected to the inner wall of the outer casing 6 of the axial flow fan via stiffeners 1.

[0012] The angle adjustment device includes a bushing 4 fixedly connected to the rotating shaft 3. Multiple spindles 7 are radially symmetrically connected to the outer circle of the bushing. A driven bevel gear 12 is fitted on the spindle. The driven bevel gear 12 has an outwardly extending sleeve 10. The middle part of the spindle has an annular groove 8. A limiting pin 11 passes through the sleeve wall of the sleeve 10 and is inserted into the annular groove 8. The outer end of the sleeve is closed. The closed end 9 of the sleeve is fixedly connected to the blade 5. The end of the rotating shaft 3 has a small diameter shaft 15 that extends inward. A driving bevel gear 13 is fitted on the small diameter shaft. The driving bevel gear 13 meshes with each driven bevel gear 12. A nut 14 is screwed on the small diameter shaft to lock the driving bevel gear 13.

[0013] The limiting pin inserted in the annular groove can prevent the driven bevel gear from moving on the spindle.

[0014] When adjusting the blade deflection angle, loosen the nut, then rotate the drive bevel gear or driven bevel gear to deflect the blade. Once the blade deflection angle meets the requirements, tighten the nut.

Claims

1. A device for adjusting the deflection angle of the blades of an axial flow fan, comprising a sleeve (4) fixedly connected to the rotating shaft (3) of the motor, characterized in that, Multiple spindles (7) are fixedly connected radially symmetrically on the outer circle of the bushing. A driven bevel gear (12) is fitted on the spindle. The driven bevel gear (12) has an outwardly extending sleeve (10). The middle part of the spindle has an annular groove (8). The limiting pin (11) passes through the sleeve wall and is inserted into the annular groove (8). The outer end of the sleeve is fixedly connected to the blade (5). The end of the rotating shaft (3) has a small diameter shaft (15) that extends inward. A driving bevel gear (13) is fitted on the small diameter shaft. A nut (14) that locks the driving bevel gear (13) is screwed on the small diameter shaft.

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