Axial flow fan with adjustable blade angle

Abstract

An axial flow fan with an adjustable blade angle comprises a motor (2), a shaft sleeve (4) is connected to a main shaft of the motor, a plurality of sleeves (5) are symmetrically connected to the outer circle of the shaft sleeve in the radial direction, first shaft bodies (15) are inserted into the sleeves in a matched mode, springs (16) are arranged between the first shaft bodies and the bottoms of the sleeves, and cover plates (12) are connected to the top ends of the sleeves. The second shaft body (6) extends out of the cover plate to be connected with the blade (8), first convex teeth (13) are evenly distributed on the circumferential portion of the inner end face of the cover plate, second convex teeth (14) are evenly distributed on the circumferential portion of the top end face of the first shaft body, and the first convex teeth can be meshed with the second convex teeth. When the angle of the blade is adjusted, the blade is pressed to separate the first convex teeth from the second convex teeth, the blade is rotated to enable the first convex teeth and the second convex teeth to be staggered by corresponding tooth positions according to the adjusting angle of the blade, then the blade is loosened, and the first convex teeth are meshed with the second convex teeth through the elastic force of the spring. The utility model has the beneficial effect that the angle of the fan blade can be conveniently adjusted.

Description

Technical Field

[0001] This utility model relates to an axial flow fan. Background Technology

[0002] In practical engineering, fans frequently require flow rate adjustments due to external demands. Changing the angle of the fan blades can regulate the flow rate. Existing technology uses a blade angle adjustment structure that 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 adjustment, the blade is removed, and a shim with a different angle is replaced to achieve the blade angle adjustment. However, blade angle adjustment is inconvenient. Utility Model Content

[0003] To facilitate the adjustment of the blade angle of the fan, this utility model proposes an axial flow fan with adjustable blade angle.

[0004] The technical solution of this utility model is an axial flow fan with adjustable blade angle, which includes a housing 7 and a motor 2. The motor is connected to the inner wall of the housing through a support plate 1. The main shaft 3 of the motor is connected to the blades 8 through an angle adjustment device. The feature is that the angle adjustment device includes a bushing 4 connected to the main shaft 3. Multiple sleeves 5 are symmetrically connected radially on the outer circle of the bushing. A first shaft 15 is inserted into the sleeve 5. A spring 16 is provided between the first shaft 15 and the bottom of the sleeve 5. A cover plate 12 is connected to the top of the sleeve. A second shaft 6 extends from the first shaft and protrudes from the cover plate. The protruding end of the second shaft 6 is connected to the blades 8. The inner end face of the cover plate is evenly distributed with first protruding teeth 13, and the top end face of the first shaft is evenly distributed with second protruding teeth 14. The first protruding teeth can mesh with the second protruding teeth.

[0005] When adjusting the blade angle, press down the blade to separate the first tooth from the second tooth. According to the adjusted blade angle, rotate the blade (second shaft) to make the first tooth and the second tooth misalign their corresponding positions. Then release the blade, and the spring force will make the first tooth and the second tooth mesh.

[0006] The beneficial effect of this utility model is that it facilitates the adjustment of the fan blade angle. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the structure of the present invention.

[0008] Figure 2 for Figure 1 A magnified view of a portion of the image.

[0009] Figure 3 This is a three-dimensional view of the first axis.

[0010] Figure 4 for Figure 1 A sectional view along the AA direction. Detailed Implementation

[0011] An axial flow fan with adjustable blade angle includes a housing 7 and a motor 2. The motor is connected to the inner wall of the housing via a support plate 1. The housing is cylindrical, and the support plate is V-shaped with its two feet connected to the inner wall of the housing and its middle part connected to the base of the motor.

[0012] The main shaft 3 of the motor is connected to the blade 8 via an angle adjustment device. The angle adjustment device includes a bushing 4 connected to the main shaft 3. Multiple sleeves 5 are symmetrically connected radially to the outer circumference of the bushing 4. A first shaft 15 is fitted into the sleeve 5. A spring 16 is provided between the first shaft 15 and the bottom of the sleeve 5. A cover plate 12 is connected to the top of the sleeve. A second shaft 6 extends from the first shaft, meaning the diameter of the second shaft is smaller than the diameter of the first shaft. The second shaft 6 extends from the cover plate, and its extended end is connected to the blade 8. Multiple first teeth 13 extend vertically from the circumference of the inner end face of the cover plate, and multiple second teeth 14 extend vertically from the circumference of the top surface of the first shaft (see...). Figure 3 The first tooth can mesh with the second tooth.

[0013] The more teeth the first and second convex teeth have, the better the finer the blade angle adjustment. The number of teeth on the first and second convex teeth should be even, and can be selected from even numbers between 6 and 36.

[0014] The first and second convex teeth are rectangular teeth, or they can be involute teeth.

[0015] When adjusting the blade angle, press down the blade to separate the first tooth from the second tooth. According to the adjusted blade angle, rotate the blade (second shaft) to make the first tooth and the second tooth misalign their corresponding positions. Then release the blade, and the spring force will make the first tooth and the second tooth mesh.

[0016] Considering that the fan outlet may be connected to the ventilation duct 11 in some cases, a notch 10 is made on the outer casing to facilitate the adjustment of the blade angle. A cover plate 9 is covered on the notch and is connected to the outer casing by screws.

[0017] When in use, the blade angle can be adjusted by opening the cover.

Claims

1. A blade angle-adjustable axial flow fan, comprising a housing (7), an electric motor (2) connected to the inner wall of the housing (7) through a support plate (1), and a main shaft (3) of the electric motor connected to a blade (8) through an angle adjusting device, characterized in that, The angle adjustment device includes a bushing (4) connected to the main shaft (3). Multiple sleeves (5) are symmetrically connected radially on the outer circle of the bushing. A first shaft (15) is inserted into the sleeve (5). A spring (16) is provided between the first shaft (15) and the bottom of the sleeve (5). A cover plate (12) is connected to the top of the sleeve. A second shaft (6) extends from the first shaft. The second shaft (6) extends out from the cover plate. The extended end of the second shaft (6) is connected to the blade (8). The inner end face of the cover plate is evenly distributed with first protruding teeth (13). The top face of the first shaft is evenly distributed with second protruding teeth (14). The first protruding teeth can mesh with the second protruding teeth.

2. The blade angle-adjustable axial flow fan according to claim 1, characterized by The first and second convex teeth are rectangular.

3. The blade angle-adjustable axial flow fan according to claim 1, wherein A notch (10) is made in the outer casing, and a cover plate (9) is covered over the notch and attached to the outer casing by screws.

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