Speed reduction axial flow fan with noise reduction rectifying plate

Abstract

The utility model relates to a speed reduction axial flow fan with noise reduction rectifying plates, which comprises an air duct, a motor and an impeller, the impeller is fixedly connected onto a rotating shaft of the motor, a plurality of motor supports are fixedly connected onto the outer wall of a shell of the motor, and the outer ends of the motor supports are fixedly connected onto the inner wall of the air duct; the air guide barrel comprises a cylindrical annular middle barrel, a flow collecting barrel with an arc-shaped radial section is formed on the lower side edge of the middle barrel, a conical diffusion barrel is formed on the upper side edge of the middle barrel, a plurality of axial arc-shaped rectifying plates are fixed on the inner wall of the diffusion barrel, and the arc-shaped rectifying plates are annularly and uniformly distributed around the central axis of the air guide barrel; a plurality of sawtooth grooves are formed in the upper side edge of the arc-shaped rectifying plate. The rectifying plates are additionally arranged on the diffusion inner wall of the air duct of the axial flow fan, airflow is guided and rectified based on the rectifying plates, vortexes in the middle of the air duct can be effectively reduced, and noise can be effectively reduced while the efficiency of the fan is improved.

Description

Technical fields:

[0001] This utility model relates to the technical field of axial flow fans, and more specifically to a speed-reducing axial flow fan with a noise-reducing rectifier plate. Background technology:

[0002] Axial flow fans have a wide range of applications. They direct airflow in the same direction as the fan blades' axis, like electric fans. Currently, the advantages of axial flow fans are large ventilation volume, small radial dimensions, simple structure, and ease of installation. However, their disadvantages include high dynamic pressure and relatively low static pressure, requiring a good diffuser to reduce dynamic pressure and increase static pressure, thus improving the fan's energy efficiency ratio. Additionally, current axial flow fans tend to form vortices in the middle of the diffuser, such as... Figure 1 As shown, during operation, the airflow is guided out along the air guide duct. Because the impeller is located in the middle of the air guide duct, a strong vortex is generated at the center of the air outlet of the air guide duct. This strong vortex will reduce the efficiency of the fan and increase the noise of the fan. Therefore, it is necessary to conduct in-depth research on axial flow fans to reduce the strong vortex at the center of the air outlet of the air guide duct. Reducing the strong vortex can improve the efficiency of the fan and reduce noise. Utility Model Content:

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a speed-reducing axial flow fan with a noise-reducing rectifier plate. The rectifier plate is added to the diffuser inner wall of the air duct. Based on the airflow guidance and rectification by the rectifier plate, the vortex in the middle of the air duct can be effectively reduced, thereby improving the fan efficiency and effectively reducing noise.

[0004] A speed-reducing axial flow fan with noise-reducing rectifier plates includes a guide tube, a motor, and an impeller. The impeller is fixed to the motor shaft. Several motor supports are fixed to the outer wall of the motor housing. The outer ends of the motor supports are fixed to the inner wall of the guide tube. The guide tube includes a cylindrical annular intermediate tube. A flow collector with a radially arc-shaped cross-section is formed on the lower side of the intermediate tube, and a conical diffuser is formed on the upper side. Several axial arc-shaped rectifier plates are fixed on the inner wall of the diffuser. The arc-shaped rectifier plates are evenly distributed in a ring around the central axis of the guide tube.

[0005] The upper side of the arc-shaped rectifier plate is formed with several serrated grooves.

[0006] Preferably, the impeller is disposed inside the intermediate cylinder and the collector cylinder of the air guide duct, and the central axis of the impeller coincides with the central axis of the air guide duct.

[0007] Preferably, the motor is installed inside the diffuser of the air guide tube, and the arc-shaped rectifier plate is installed around the motor.

[0008] Preferably, the side of the arc-shaped rectifier plate closest to the motor is arc-shaped.

[0009] Preferably, the width of the arc-shaped rectifier plate gradually decreases from top to bottom.

[0010] Preferably, the arc-shaped rectifier plate in the air duct is provided with at least eight groups, and the number of arc-shaped rectifier plates is even.

[0011] Preferably, the upper side of the diffusion cylinder is formed with a connecting flange, the upper end of the motor protrudes out of the diffusion cylinder and is provided with a circular protective mesh cover, and the outer ring of the protective mesh cover is fixedly connected to the connecting flange of the diffusion cylinder by screws.

[0012] The beneficial effects of the utility model lie in:

[0013] The rectifier plate is additionally arranged on the diffusion inner wall of the axial flow fan air duct, airflow is guided and rectified based on the rectifier plate, vortex in the middle of the air duct is effectively reduced, fan efficiency is improved, and noise is effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a schematic diagram of airflow flow direction of the existing axial flow fan;

[0015] Figure 2 It is a schematic diagram of airflow flow direction of the utility model;

[0016] Figure 3 It is a schematic diagram of structure of the utility model in three dimensions;

[0017] Figure 4 It is a schematic diagram of structure of the utility model in plan view.

[0018] In the drawing: 1, air duct; 11, middle cylinder; 12, flow collecting cylinder; 13, diffusion cylinder; 14, connecting flange; 2, motor; 3, impeller; 3, impeller; 4, motor support; 5, arc-shaped rectifier plate; 51, sawtooth groove. DETAILED DESCRIPTION

[0019] Embodiment: see Figures 2 to 4 As shown in the drawing, a speed-reducing axial flow fan with noise-reducing rectifier plates comprises an air duct 1, a motor 2 and an impeller 3, the impeller 3 is fixedly connected to the rotating shaft of the motor 2, a plurality of motor supports 4 are fixedly connected to the outer wall of the shell of the motor 2, and the outer ends of the motor supports 4 are fixedly connected to the inner wall of the air duct 1; the air duct 1 comprises a cylindrical annular middle cylinder 11, the lower side of the middle cylinder 11 is formed with a flow collecting cylinder 12 with a circular arc-shaped radial cross section, and the upper side of the middle cylinder 11 is formed with a diffusion cylinder 13 with a conical shape; a plurality of axial arc-shaped rectifier plates 5 are fixed to the inner wall of the diffusion cylinder 13; the arc-shaped rectifier plates 5 are uniformly distributed in a ring shape around the central axis of the air duct 1.

[0020] The upper side of the arc-shaped rectifier plate 5 is formed with a plurality of sawtooth grooves 51, and the sawtooth grooves 51 serve to reduce noise.

[0021] The impeller 3 is arranged in the middle cylinder 11 and the collecting cylinder 12 of the air duct 1, and the central axis of the impeller 3 coincides with the central axis of the air duct 1.

[0022] The motor 2 is arranged in the diffusion cylinder 13 of the air duct 1, and the arc-shaped rectifier plate 5 is arranged around the motor 2.

[0023] The side edge of the arc-shaped rectifier plate 5 close to the motor 2 is in a circular arc shape.

[0024] The width of the arc-shaped rectifier plate 5 gradually decreases from top to bottom.

[0025] The arc-shaped rectifier plate 5 in the air duct 1 is provided with at least eight groups, and the number of the arc-shaped rectifier plate 5 is even. Figure 2 According to the air duct 1, there are 12 groups of arc-shaped rectifier plates 5.

[0026] The upper side edge of the diffusion cylinder 13 is formed with a connecting flange 14, the upper end of the motor 2 extends out of the diffusion cylinder 13 and is provided with a circular protective mesh cover, and the outer ring of the protective mesh cover is fixedly connected to the connecting flange 14 of the diffusion cylinder 13 by screws.

[0027] Working principle: the structure is a speed-reducing axial flow fan with a noise-reducing rectifier plate, and the main technical point of the speed-reducing axial flow fan is to increase the length of the diffusion cylinder 13 of the air duct 1. Figure 2 According to the air duct 1, the length of the diffusion cylinder 13 is close to half of the overall length of the air duct 1, and then the arc-shaped rectifier plates 5 are arranged in a ring shape on the inner wall of the diffusion cylinder 13, when the axial flow fan is running, the airflow can be guided through the arc-shaped rectifier plates 5, the arc-shaped rectifier plates 5 are used for rectification, and the vortex of the airflow in the air duct 1 is reduced.

[0028] The embodiments are used to illustrate the utility model, and are not used to limit the utility model. Any person skilled in the art can modify the embodiments without departing from the spirit and scope of the utility model, and therefore the protection scope of the utility model should be as listed in the claims of the utility model.

Claims

1. A speed-reducing axial flow fan with a noise-reducing rectifier plate, comprising a guide tube (1), a motor (2), and an impeller (3), wherein the impeller (3) is fixedly connected to the rotating shaft of the motor (2), and a plurality of motor brackets (4) are fixedly connected to the outer wall of the housing of the motor (2), and the outer ends of the motor brackets (4) are fixedly connected to the inner wall of the guide tube (1); characterized in that: The air guide tube (1) includes a cylindrical annular intermediate tube (11), the lower side of the intermediate tube (11) is formed with a radially arc-shaped collecting tube (12), the upper side is formed with a conical diffuser tube (13), and a number of axial arc-shaped rectifier plates (5) are fixed on the inner wall of the diffuser tube (13). The arc-shaped rectifier plates (5) are evenly distributed in a ring around the central axis of the air guide tube (1). The upper side of the arc-shaped rectifier plate (5) is formed with several serrated grooves (51).

2. The axial flow fan with noise reduction rectifier plate according to claim 1, characterized in that: The impeller (3) is installed in the intermediate cylinder (11) and the collector cylinder (12) of the air guide (1), and the central axis of the impeller (3) coincides with the central axis of the air guide (1).

3. A speed-reducing axial flow fan with a noise-reducing rectifier plate according to claim 2, characterized in that: The motor (2) is installed inside the diffuser (13) of the air guide tube (1), and the arc-shaped rectifier plate (5) is installed around the motor (2).

4. A speed-reducing axial flow fan with a noise-reducing rectifier plate according to claim 3, characterized in that: The side of the arc-shaped rectifier plate (5) near the motor (2) is arc-shaped.

5. A speed-reducing axial flow fan with a noise-reducing rectifier plate according to claim 4, characterized in that: The width of the arc-shaped rectifier plate (5) gradually decreases from top to bottom.

6. A speed-reducing axial flow fan with a noise-reducing rectifier plate according to claim 1, characterized in that: The air duct (1) contains at least eight sets of arc-shaped rectifier plates (5), and the number of arc-shaped rectifier plates (5) is even.

7. A speed-reducing axial flow fan with a noise-reducing rectifier plate according to claim 1, characterized in that: The upper side of the diffuser (13) is formed with a connecting baffle (14). The upper end of the motor (2) extends out of the diffuser (13) and is fitted with a circular protective mesh cover. The outer ring of the protective mesh cover is fixedly connected to the connecting baffle (14) of the diffuser (13) by screws.

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