Axial flow fan with guide vane structure

Abstract

The utility model discloses an axial flow fan with a guide vane structure, which belongs to the technical field of axial flow fans and comprises an outer shell and a fan impeller, the outer shell is hollow, the rear end and the front end of the outer shell are respectively provided with an air inlet and an air outlet, the inner diameter of the outer shell is gradually increased from front to back, and the air outlet is covered with the guide vane structure. The guide vane structure is composed of a plurality of air guide blades extending from the edge of the air outlet to the center, and the air guide blades are distributed in an array mode with the air outlet as the center. The fan impeller is located on the side, close to the air outlet, in the outer shell and provided with a plurality of impeller blades extending towards the inner wall of the outer shell, and a driving motor is arranged on the side, away from the air outlet, of the fan impeller and fixedly connected with the outer shell. According to the axial flow fan, output airflow can be faster and move to a farther position, and the ventilation efficiency of the axial flow fan on a working space can be improved.

Description

Technical Field

[0001] This utility model relates to the field of axial flow fan technology, and specifically to an axial flow fan with a guide vane structure. Background Technology

[0002] Axial flow fans are commonly used for ventilation in factories, warehouses, offices, and residences. Internally, an impeller is driven by a motor or other drive mechanism. As the impeller rotates, gas enters axially from the inlet, is pushed by the blades, and gains energy before being expelled from the outlet to form an airflow. The working principle of an axial flow fan is similar to that of a regular fan. However, axial flow fans typically need to operate in relatively spacious areas. Therefore, they need to stably deliver airflow to the furthest possible location to ensure efficient ventilation. However, once airflow is generated at the outlet, it tends to disperse quickly due to the lack of constraint from the fan casing, preventing the airflow from reaching distant locations and thus affecting the overall ventilation effect.

[0003] Based on the above, Chinese Patent Publication No. CN219733691U discloses a high-efficiency axial flow fan, including a first sleeve, a sleeve base is provided inside the first sleeve, a stepper motor is provided inside the sleeve base, a connecting seat is symmetrically bolted to the surface of the stepper motor and slidably connected to the sleeve base, a fixed seat is symmetrically provided on the surface of the sleeve base, a first limiting bolt is symmetrically threaded between the fixed seat and the sleeve base, and one end of the first limiting bolt penetrates into the interior of the sleeve base and is threadedly connected to the connecting seat, the output end of the stepper motor penetrates into the interior of the sleeve base and is fitted with a second sleeve, a mounting seat is fixedly fitted to the surface of the second sleeve, a locking groove is provided on the front of the mounting seat, a locking block is provided inside the locking groove, a fan blade is integrally machined on the side of the locking block away from the locking groove, a pressure plate is provided on the front of the second sleeve, a fixing bolt is threadedly connected to the front of the pressure plate, one end of the fixing bolt penetrates into the interior of the second sleeve and is threadedly connected to the output end of the stepper motor.

[0004] The aforementioned patent document discloses an axial flow fan that improves the efficiency of blade replacement. In this axial flow fan, a second sleeve cooperates with a mounting base, and a locking groove is provided on the mounting base. When the blade needs to be replaced, simply unscrew the fixing bolt from the pressure plate to separate it from the output end of the stepper motor and remove the pressure plate. The locking block can then be taken out from the limiting rod in the locking groove, thus improving the blade replacement efficiency. However, the blades of axial flow fans usually have a long service life and rarely need to be replaced. What axial flow fans really need to improve is their output airflow efficiency and their ability to promote ventilation in the workspace. Therefore, this axial flow fan still has room for improvement in terms of improving airflow output efficiency and air delivery distance. Utility Model Content

[0005] To address the technical deficiencies in the background technology, this utility model proposes an axial flow fan with a guide vane structure, which solves the aforementioned technical problems and meets practical needs. The specific technical solution is as follows:

[0006] An axial flow fan with a guide vane structure includes an outer casing and a fan impeller. The outer casing is hollow inside and has an air inlet and an air outlet at the rear and front ends, respectively. The inner diameter of the outer casing gradually increases from front to back. The air outlet is covered with a guide vane structure, which consists of a plurality of guide vanes extending from the edge of the air outlet toward the center. The plurality of guide vanes are arranged in an array around the center of the air outlet.

[0007] The fan impeller is located inside the outer casing near the air outlet. The fan impeller has several impeller blades extending toward the inner wall of the outer casing. A drive motor is located on the side of the fan impeller away from the air outlet, and the drive motor is fixedly connected to the outer casing.

[0008] As a further technical solution of this utility model, the outer shell is composed of at least two outer shell components arranged sequentially in the front-back direction, and an air inlet groove is formed between two adjacent outer shell components, extending into the interior of the outer shell, and the air inlet groove surrounds the surface of the outer shell.

[0009] As a further technical solution of this utility model, the rear end of the outer shell assembly is provided with an air guide ring that surrounds the edge of the air inlet groove or the edge of the air inlet, and the inner diameter of the air guide ring gradually increases from front to back.

[0010] As a further technical solution of this utility model, a plurality of the air guide vanes divide the air outlet to form a plurality of air outlet slots, and the front end of the air guide vanes protrudes outward from the front end of the air outlet.

[0011] As a further technical solution of this utility model, the height of the protrusion at the front end of the air guide blade gradually increases from near the center of the air outlet to the edge.

[0012] As a further technical solution of this utility model, the outer surface of the outer shell is provided with fixed brackets at both opposite ends, one end of the fixed bracket extends backward and the rear end of the fixed bracket is provided with a fixing hole.

[0013] The beneficial effects of this utility model are as follows:

[0014] This utility model discloses an axial flow fan with high-efficiency airflow output. The inner diameter of the outer casing of the axial flow fan gradually decreases along the airflow direction, and the airflow speed inside the outer casing increases, thereby ejecting a higher-speed airflow at the air outlet. This allows the airflow to reach a farther position, improving the ventilation efficiency of the axial flow fan's working space. In addition, the guide vanes located at the air outlet form an obstruction in the direction of airflow rotation when the airflow is ejected, reducing the extent of outward diffusion of the airflow due to rotation. This allows the airflow to maintain a higher density and move to a farther position, further improving the ventilation efficiency of the axial flow fan for the working space. Attached Figure Description

[0015] Figure 1 A schematic diagram of the structure of an axial flow fan with guide vanes. Figure 1 .

[0016] Figure 2 A disassembly diagram of an axial flow fan with a guide vane structure. Figure 1 .

[0017] Figure 3 A schematic diagram of the structure of an axial flow fan with guide vanes. Figure 2 .

[0018] Figure 4 A disassembly diagram of an axial flow fan with a guide vane structure. Figure 2 .

[0019] Wherein: 1-outer shell, 11-air inlet, 12-air outlet, 13-air guide vane, 14-outer shell assembly, 15-air inlet slot, 16-air guide ring, 2-fan impeller, 3-drive motor, 4-fixed bracket, 41-fixing hole. Detailed Implementation

[0020] The embodiments of this utility model will be described below with reference to the accompanying drawings and related examples. The embodiments of this utility model are not limited to the following examples, and this utility model relates to relevant necessary components in this technical field, which should be regarded as well-known technology in this technical field and can be known and mastered by those skilled in this technical field.

[0021] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4An axial flow fan with a guide vane structure includes an outer casing 1 and a fan impeller 2. The outer casing 1 is hollow inside and has an air inlet 11 and an air outlet 12 at the rear and front ends, respectively. The inner diameter of the outer casing 1 gradually increases from front to back. The air outlet 12 is covered with a guide vane structure, which is composed of a plurality of guide vanes 13 extending from the edge of the air outlet 12 toward the center. The plurality of guide vanes 13 are arranged in an array around the center of the air outlet 12.

[0022] The fan impeller 2 is located inside the outer casing 1 on the side near the air outlet 12. The fan impeller 2 is provided with several impeller blades extending toward the inner wall of the outer casing 1. The fan impeller 2 is provided with a drive motor 3 on the side away from the air outlet 12. The drive motor 3 is fixedly connected to the outer casing 1.

[0023] This utility model discloses an axial flow fan with high-efficiency airflow output. The axial flow fan uses an outer shell 1 as a protective structure for the surface and a structure for mounting and fixing various components. The outer surface of the outer shell 1 has a cylindrical or frustum-shaped outline, and the inner outline of the outer shell 1 has a frustum-shaped outline. The end with the larger inner diameter is the air inlet 11, and the end with the smaller inner diameter is the air outlet 12. The drive motor 3 is mounted and fixed inside the outer shell 1 near the air inlet 11 by a bracket. The drive motor 3 is electrically connected to the power supply line through wires. After the power supply line provides power to the drive motor, the drive motor 3 drives the fan impeller 2 to rotate. The rotating fan impeller 2 will generate negative pressure suction on its back side, that is, the side near the air inlet 11, drawing air from the air inlet 11 into the inner shell 1. Inside the outer shell 1, the air is pushed by the impeller blades on the fan impeller 2 and its energy is increased. Then it is ejected from the air outlet 12 to form an airflow.

[0024] With the above structure, it should be noted that the outer casing 1 can more efficiently draw in outside air through the larger diameter air inlet 11, providing the basic conditions for the axial flow fan to output a large flow of air. When the fan impeller 2 rotates, the airflow generated flows along the air inlet 11 toward the air outlet 12. Furthermore, the inner diameter of the outer casing 1 gradually decreases along the direction of fluid flow. According to the principle of fluid continuity, the airflow speed inside the outer casing 1 will increase, thereby ejecting a higher speed airflow at the air outlet 12, allowing the airflow to reach a farther position and improving the ventilation efficiency of the axial flow fan's working space.

[0025] It should be further explained that the rotating fan impeller 2 pushes the air, causing the airflow to be ejected from the outlet 12 and rotate in the same direction as the fan impeller 2. While the airflow is ejected in a straight line, it rotates at a certain speed. Since the airflow is no longer constrained by the outer shell 1, the rotation of the airflow will generate a certain centrifugal force, causing the airflow to gradually diffuse outward, thereby reducing the density of the airflow and shortening the distance the airflow travels. The several guide vanes 13 of this utility model divide the outlet 12 into several air outlet slots. The front end of the guide vane 13 protrudes outward from the front end of the outlet 12. The guide vane 13 at the outlet 12 will form a blockage in the direction of airflow rotation when the airflow is ejected, which can reduce the rotation speed of the ejected airflow or even stop it from rotating. This reduces the extent of the airflow diffusion outward due to rotation, allowing the airflow to maintain a higher density and travel to a farther position, which is beneficial to improving the efficiency of the axial flow fan in ventilating the working space.

[0026] As one of the preferred embodiments of this utility model, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 The outer shell 1 is composed of at least two outer shell components 14 arranged sequentially in the front-back direction. An air inlet groove 15 is formed between two adjacent outer shell components 14, extending into the interior of the outer shell 1. The air inlet groove 15 surrounds the surface of the outer shell 1. The outer shell 1 of this utility model is preferably composed of two outer shell components 14. With this structure, outside air can enter the interior of the outer shell 1 not only through the air inlet 11, but also through the air inlet groove 15, thereby increasing the airflow into the interior of the outer shell 1 and improving the airflow output of the axial flow fan.

[0027] As one of the preferred embodiments of this utility model, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 The rear end of the outer casing assembly 14 is provided with an air guide ring 16 that surrounds the edge of the air inlet slot 15 or the edge of the air inlet 11. The inner diameter of the air guide ring 16 gradually increases from front to back. According to the structure of the air guide ring 16, the air guide ring 16 can initially compress the air entering the outer casing 1. At the same time, the air guide ring 16 can further increase the diameter of the air inlet 11, so that the air inlet 11 can draw in outside air over a larger range, which is beneficial to the efficiency of air entering the outer casing 1. In addition, when the air guide ring 16 is set at the air inlet slot 15, the air guide ring 16 can make the opening of the air inlet slot 15 tilted to the rear, so that the direction of air entering the outer casing 1 from the air inlet slot 15 is more matched with the flow direction of the airflow inside the outer casing 1, so that the air can enter the outer casing 1 more smoothly from the air inlet slot 15. The air guide ring 16 can also prevent the airflow inside the outer casing 1 from escaping outward from the air inlet slot 15, which is beneficial to make the airflow output by the axial flow fan more stable.

[0028] As one of the preferred embodiments of this utility model, refer to Figure 1 , Figure 2 The height of the protrusion at the front end of the guide vane 13 gradually increases from near the center of the air outlet 12 to the edge. After the airflow is ejected from the air outlet 12, the airflow usually has a higher rotation speed closer to the edge of the air outlet 12. The height of the protrusion of the guide vane 13 near the edge of the air outlet 12 is higher. The guide vane 13 can better block the airflow with a higher rotation speed through this position, improve the effect of the guide vane 13 in blocking the rotation of the airflow, and help to increase the distance of the airflow movement.

[0029] As one of the preferred embodiments of this utility model, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 The outer surface of the outer casing 1 is provided with fixed brackets 4 at both opposite ends. One end of the fixed bracket 4 extends backward and the rear end of the fixed bracket 4 is provided with a fixing hole 41. The fixed bracket 4 is used to install and fix the axial flow fan on the wall, mounting bracket or other fixed structure. Using fixing bolts, nuts and other tools that match the fixing hole 41, the fixed bracket 4 is installed on the fixed structure, so that the axial flow fan is firmly fixed, which can suppress the vibration generated during the operation of the axial flow fan and improve the stability of the axial flow fan during operation.

[0030] In summary, this utility model discloses an axial flow fan with high-efficiency airflow output. The inner diameter of the outer casing 1 of the axial flow fan gradually decreases along the airflow direction, and the airflow speed inside the outer casing 1 increases, thereby ejecting a higher-speed airflow at the air outlet 12. This allows the airflow to reach a farther position, thus improving the ventilation efficiency of the axial flow fan's working space. In addition, the guide vane 13 located at the air outlet 12 forms an obstruction in the airflow rotation direction when the airflow is ejected, reducing the extent of outward diffusion of the airflow due to rotation. This allows the airflow to maintain a higher density and move to a farther position, further improving the ventilation efficiency of the axial flow fan for the working space.

[0031] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An axial flow fan with a guide vane structure, comprising a housing (1) and a fan impeller (2), characterized in that, The outer shell (1) is hollow inside and has an air inlet (11) at the rear end and an air outlet (12) at the front end. The inner diameter of the outer shell (1) gradually increases from front to back. The air outlet (12) is covered with a guide vane structure. The guide vane structure is composed of several guide vanes (13) extending from the edge of the air outlet (12) toward the center. The several guide vanes (13) are arranged in an array around the center of the air outlet (12). The fan impeller (2) is located inside the outer casing (1) on the side near the air outlet (12). The fan impeller (2) is provided with a number of impeller blades extending toward the inner wall of the outer casing (1). The fan impeller (2) is provided with a drive motor (3) on the side away from the air outlet (12). The drive motor (3) is fixedly connected to the outer casing (1).

2. The axial flow fan with guide vane structure according to claim 1, characterized in that, The outer shell (1) is composed of at least two outer shell components (14) arranged sequentially in the front-back direction. An air inlet groove (15) is formed between two adjacent outer shell components (14) and extends into the interior of the outer shell (1). The air inlet groove (15) surrounds the surface of the outer shell (1).

3. The axial flow fan with guide vane structure according to claim 2, characterized in that, The rear end of the outer casing assembly (14) is provided with an air guide ring (16) that surrounds the edge of the air inlet groove (15) or the edge of the air inlet (11), and the inner diameter of the air guide ring (16) gradually increases from front to back.

4. The axial flow fan with guide vane structure according to claim 1, characterized in that, Several guide vanes (13) divide the air outlet (12) to form several air outlet slots, and the front end of the guide vanes (13) protrudes outward from the front end of the air outlet (12).

5. The axial flow fan with guide vane structure according to claim 1, characterized in that, The height of the protrusion at the front end of the air guide vane (13) gradually increases from the center near the air outlet (12) to the edge.

6. The axial flow fan with guide vane structure according to claim 1, characterized in that, The outer surface of the outer shell (1) is provided with fixed brackets (4) at both opposite ends. One end of the fixed bracket (4) extends to the rear and the rear end of the fixed bracket (4) is provided with a fixing hole (41).

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