Axial flow fan with dustproof function

Abstract

The utility model discloses an axial flow fan with a dustproof function, which relates to the technical field of axial flow fans and comprises an axial flow fan main body, an air inlet and an air outlet are respectively arranged on the front side and the back side of the axial flow fan main body, and the inner side of the air outlet is connected with a gravity dustproof component. The gravity dustproof assembly is used for preventing external dust from entering the axial flow fan main body from the air outlet under the action of gravity when the axial flow fan stops running; the gravity dustproof assembly comprises a dustproof plate connected to the inner side of the air outlet through a movable shaft, and a balancing weight is arranged on the back face of the dustproof plate. The gravity dustproof assembly is connected to the inner side of the air outlet, so that the problems that in the shutdown period of an existing axial flow fan, due to the fact that effective dustproof measures are lacked, a large amount of dust flows into equipment, internal electrical elements are short-circuited, mechanical parts are abraded and blocked, and the service life of the equipment is prolonged can be solved. The service life of equipment is shortened; and the maintenance cost is increased.

Description

Technical Field

[0001] This utility model relates to the field of axial flow fan technology, specifically to an axial flow fan with dustproof function. Background Technology

[0002] Axial flow fans are used to achieve directional flow of air or other gases. Their function is to use the high-speed rotation of the impeller to make the gas enter the fan axially, gain energy, and then discharge it. They can be used for ventilation, cooling, or pressurization.

[0003] Patent document CN214617118U discloses an axial flow fan with dustproof function. This document mainly considers that when existing axial flow fans are in use, in order to prevent impurities or dust from entering the axial flow fan, a filter screen is usually installed on the air inlet side of the axial flow fan. However, the mesh of the filter screen is easily clogged with impurities or dust, resulting in low air intake efficiency and difficulty in cleaning the impurities or dust in the mesh. It does not consider that when existing axial flow fans are not in use, due to the lack of effective dustproof measures, a large amount of dust will rush into the equipment, causing short circuits in internal electrical components and wear and jamming of mechanical parts, resulting in frequent failures, shortened equipment lifespan and increased maintenance costs. Utility Model Content

[0004] The purpose of this utility model is to provide an axial flow fan with dust prevention function to solve the problem mentioned in the background art that when existing axial flow fans are shut down, the lack of effective dust prevention measures leads to a large amount of dust entering the equipment, causing short circuits in internal electrical components and wear and jamming of mechanical parts, resulting in frequent failures, shortened equipment lifespan and increased maintenance costs.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an axial flow fan with dustproof function, comprising an axial flow fan body, wherein an air inlet and an air outlet are respectively provided on the front and back of the axial flow fan body, and a gravity dustproof component is connected to the inner side of the air outlet. The gravity dustproof component is used to block external dust from entering the interior of the axial flow fan body from the air outlet by using gravity when the axial flow fan stops running.

[0006] The gravity dustproof assembly includes a dustproof plate connected to the inside of the air outlet via a movable shaft, and a counterweight is provided on the back of the dustproof plate.

[0007] Preferably, the weight of the counterweight is greater than the air resistance experienced by the dustproof plate when it is stationary.

[0008] Preferably, a conical diffuser is connected to the outer side of the air outlet, and the small-diameter end of the conical diffuser is connected to the air outlet. The inner wall of the conical diffuser is provided with uniformly arranged annular protrusions.

[0009] Preferably, a multi-layer filter assembly is provided on the inner side of the air inlet, which is used to filter the air entering the axial flow fan body step by step.

[0010] The multi-layer filter assembly includes an annular support frame disposed inside the air inlet. Filter screen one, filter screen two, and filter screen three are arranged sequentially from the outside to the inside of the annular support frame. The density of filter screen one is less than that of filter screen two, and the density of filter screen two is less than that of filter screen three.

[0011] Preferably, a bidirectional screw is provided through the filter screen 1 and filter screen 2, as well as the filter screen 2 and filter screen 3, and a nut is fitted onto the outer surface of the bidirectional screw.

[0012] Preferably, both ends of the bidirectional screw are rotatably connected to the annular support frame, the nut is threadedly engaged with the bidirectional screw, and the outer surface of the nut is provided with anti-slip texture.

[0013] Preferably, the axial flow fan body has fan blades installed inside.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model connects a gravity dustproof component inside the air outlet. This component includes a dustproof plate connected by a movable shaft and a counterweight on the back. When the axial flow fan is running, the thrust generated by the airflow can easily push open the dustproof plate, ensuring smooth ventilation. Once the fan stops running, the counterweight on the back of the dustproof plate, under its own weight, drives the dustproof plate to rotate quickly and precisely fit into the air outlet, forming a tight barrier. This achieves the effect of automatically blocking external dust from entering the axial flow fan body from the air outlet when the axial flow fan is not running. Compared with the prior art, it can improve the dustproof capability of the axial flow fan in the shutdown state. Therefore, it can solve the problem that when the existing axial flow fan is shut down, due to the lack of effective dustproof measures, a large amount of dust will rush into the equipment, causing short circuits in internal electrical components and wear and jamming of mechanical parts, resulting in frequent failures, shortened equipment life and increased maintenance costs.

[0016] 2. This utility model incorporates a multi-layered filtration assembly inside the air inlet. This assembly consists of a ring-shaped support frame and three filters with progressively increasing density: filter one, filter two, and filter three. Filter one first intercepts larger particles of impurities, filter two further filters medium-sized dust particles, and filter three, with its fine density, isolates even the smallest dust particles. This achieves graded filtration of air from coarse to fine. Compared to the single or simple filter structures in existing technologies, this multi-layered filtration method significantly improves the accuracy and efficiency of air filtration. Therefore, it can solve the problem that existing axial flow fans, due to poor filtration, cannot effectively intercept dust in the air, allowing dust to enter the fan with the airflow, resulting in decreased ventilation efficiency, increased energy consumption, and pollution of the environment, affecting personnel health and the normal operation of equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a side view of the present invention.

[0019] Figure 3 This is a schematic diagram of the gravity dustproof component structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the dustproof plate and counterweight of this utility model;

[0021] Figure 5 For the present utility model Figure 2 Enlarged structural diagram at point A in the middle;

[0022] Figure 6 This is a schematic diagram of the wind turbine blade structure of this utility model.

[0023] In the diagram: 1. Main body of axial flow fan; 2. Air inlet; 3. Air outlet; 4. Annular support frame; 5. Filter screen one; 6. Filter screen two; 7. Filter screen three; 8. Bidirectional screw; 9. Nut; 10. Fan blade; 11. Dustproof plate; 12. Counterweight; 13. Conical diffuser; 14. Annular protrusion. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 The present invention provides an embodiment of an axial flow fan with a dustproof function, comprising an axial flow fan body 1, an air inlet 2 and an air outlet 3 respectively provided on the front and back of the axial flow fan body 1, and a gravity dustproof component connected to the inner side of the air outlet 3. The gravity dustproof component is used to block external dust from entering the interior of the axial flow fan body 1 from the air outlet 3 by using gravity when the axial flow fan stops running.

[0027] The gravity dustproof assembly includes a dustproof plate 11 connected to the inside of the air outlet 3 via a movable shaft, and a counterweight 12 is provided on the back of the dustproof plate 11.

[0028] The weight of the counterweight 12 is greater than the air resistance experienced by the dustproof plate 11 when it is stationary.

[0029] A conical diffuser 13 is connected to the outside of the air outlet 3, and the small-diameter end of the conical diffuser 13 is connected to the air outlet 3. The inner wall of the conical diffuser 13 is provided with uniformly arranged annular protrusions 14.

[0030] Furthermore, the axial flow fan body 1 serves as the core load-bearing structure. Its front air inlet 2 and rear air outlet 3 form an airflow channel, providing basic conditions for ventilation operations. Inside the air outlet 3, the gravity dustproof component plays a key dustproof role. The dustproof plate 11 is hinged to the inside of the air outlet 3 via a movable shaft and can rotate flexibly. The counterweight 12 on the back has a weight greater than the air resistance experienced by the dustproof plate 11 when it is stationary. When the fan is running, the airflow pushes the dustproof plate 11 to open, allowing unobstructed airflow. After the fan stops, the counterweight 12 pulls the dustproof plate 11 back to its original position by gravity, tightly covering the air outlet 3, preventing dust from entering from the rear and ensuring internal cleanliness.

[0031] The conical diffuser 13 connected to the outside of the air outlet 3 has a small diameter end connected to the air outlet 3 and a large diameter end extending outward. It diffuses and guides the exhaust airflow, reduces exhaust resistance, and improves exhaust efficiency. The annular protrusions 14 evenly arranged on its inner wall can disrupt the airflow pattern when the airflow passes through, making the airflow diffuse more evenly. At the same time, it can also intercept a small amount of dust that may be carried in the exhaust airflow, further enhancing the dustproof effect.

[0032] Please see Figure 1 , Figure 2 , Figure 5 and Figure 6 An embodiment of this utility model is provided: an axial flow fan with dustproof function, wherein a multi-layer filter assembly is provided on the inner side of the air inlet 2, and the multi-layer filter assembly is used to filter the air entering the main body 1 of the axial flow fan step by step.

[0033] The multi-layer filter assembly includes an annular support frame 4 disposed inside the air inlet 2. Filter screen 1 5, filter screen 2 6, and filter screen 3 7 are arranged sequentially from the outside to the inside of the annular support frame 4. The density of filter screen 1 5 is less than that of filter screen 2 6, and the density of filter screen 2 6 is less than that of filter screen 3 7.

[0034] A bidirectional screw 8 is connected through the filter screen 5 and the filter screen 6, as well as between the filter screen 6 and the filter screen 7. A nut 9 is fitted onto the outer surface of the bidirectional screw 8.

[0035] The two ends of the bidirectional screw 8 are rotatably connected to the annular support frame 4, and the nut 9 is threadedly engaged with the bidirectional screw 8, and the outer surface of the nut 9 is provided with anti-slip texture.

[0036] The fan blades 10 are installed inside the main body 1 of the axial flow fan.

[0037] Furthermore, the multi-layer filter assembly inside the air inlet 2 consists of an annular support frame 4, filter screen 1 5, filter screen 2 6, and filter screen 3 7. The annular support frame 4 is firmly installed inside the air inlet 2 to support the multi-layer filter screen. The density of the three filter screens increases sequentially. Filter screen 1 5 first intercepts larger impurities such as leaves and large particles of sand and gravel. Filter screen 2 6 filters medium-sized dust particles. Filter screen 3 7 blocks fine dust particles with its fine filter structure, thus achieving graded filtration of the incoming air and ensuring the cleanliness of the air entering the axial flow fan body 1.

[0038] A bidirectional screw 8 connects the first filter screen (5), the second filter screen (6), and the third filter screen (7) through them. Both ends are rotatably connected to the annular support frame (4), allowing for flexible rotation. Nuts 9 with anti-slip textures on their outer surfaces are threaded into the bidirectional screw 8. By turning the nut 9, the bidirectional screw 8 rotates, causing the three layers of filter screens to be squeezed or loosened synchronously, facilitating the adjustment of the spacing between the filter screens. It also allows for quick disassembly and installation when cleaning or replacing the filter screens by rotating the nut 9, making operation convenient and improving maintenance efficiency.

[0039] The fan blades 10 inside the main body 1 of the axial flow fan rotate at high speed under the drive of the motor, generating strong suction and thrust, which causes air to enter from the air inlet 2 after being purified by the multi-layer filter components, and then to be discharged through the air outlet 3 and the conical diffuser 13, forming a continuous and stable ventilation cycle.

[0040] Working principle: When the axial flow fan starts, the fan blades 10 inside the main body 1 of the axial flow fan begin to rotate at high speed under the drive of the motor. The rotation of the fan blades 10 generates a strong suction force, which causes outside air to enter from the air inlet 2. The multi-layer filter components inside the air inlet 2 begin to play their role. The filter screen 5 with the lowest density first intercepts larger particles of impurities, such as leaves and sand. Then the air continues to flow inward, and the filter screen 6 filters out medium-sized dust particles. Finally, the filter screen 7 isolates tiny dust particles with its fine density. The clean air after three stages of filtration enters the interior of the main body 1 of the axial flow fan.

[0041] During the operation of the ventilator, the purified air flows towards the air outlet 3 under the push of the fan blades 10. At this time, the dustproof plate 11 in the gravity dustproof component inside the air outlet 3 is pushed outward by the airflow and the movable shaft is used as the fulcrum, so that the air can be discharged smoothly through the air outlet 3. At the same time, the conical diffuser 13 connected to the outside of the air outlet 3 has its small diameter end connected to the air outlet 3 and its large diameter end extended outward, which plays a role in diffusing and guiding the discharged airflow, reducing the exhaust resistance. The annular protrusions 14 on the inner wall disrupt the airflow pattern, so that the airflow is more evenly diffused to the external environment.

[0042] When the axial flow fan stops running, the fan blades 10 stop rotating and the airflow thrust disappears. At this time, the counterweight 12 on the back of the dustproof plate 11 rotates rapidly due to its own weight, precisely fitting the air outlet 3 to form a tight barrier. This effectively blocks external dust from entering the axial flow fan body 1 from the air outlet 3, preventing dust from polluting and damaging the equipment and preparing for the next start-up of the fan.

[0043] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0044] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A axial flow fan with dustproof function, comprising an axial flow fan body (1), characterized in that: The front and back sides of the axial flow fan body (1) are respectively provided with an air inlet (2) and an air outlet (3). The inner side of the air outlet (3) is connected to a gravity dustproof component. The gravity dustproof component is used to block external dust from entering the interior of the axial flow fan body (1) from the air outlet (3) by gravity when the axial flow fan stops running. The gravity dustproof assembly includes a dustproof plate (11) connected to the inside of the air outlet (3) via a movable shaft, and a counterweight (12) is provided on the back of the dustproof plate (11).

2. The axial flow fan with dustproof function according to claim 1, characterized in that: The weight of the counterweight (12) is greater than the air resistance experienced by the dustproof plate (11) when it is stationary.

3. The axial flow fan with dustproof function according to claim 1, characterized in that: The outer side of the air outlet (3) is connected to a conical diffuser (13), and the small diameter end of the conical diffuser (13) is connected to the air outlet (3). The inner wall of the conical diffuser (13) is provided with uniformly arranged annular protrusions (14).

4. The axial flow fan with dustproof function according to claim 1, characterized in that: The air inlet (2) is provided with a multi-layer filter assembly on its inner side. The multi-layer filter assembly is used to filter the air entering the axial flow fan body (1) step by step. The multi-layer filter assembly includes an annular support frame (4) disposed inside the air inlet (2). The inner side of the annular support frame (4) is provided with filter screen one (5), filter screen two (6) and filter screen three (7) from the outside to the inside. The density of filter screen one (5) is less than that of filter screen two (6), and the density of filter screen two (6) is less than that of filter screen three (7).

5. The axial flow fan with dustproof function according to claim 4, characterized in that: A bidirectional screw (8) is connected through the filter screen 1 (5) and filter screen 2 (6) and the filter screen 2 (6) and filter screen 3 (7), and a nut (9) is sleeved on the outer surface of the bidirectional screw (8).

6. The axial flow fan with dustproof function according to claim 5, characterized in that: The two ends of the bidirectional screw (8) are rotatably connected to the annular support frame (4), the nut (9) is threadedly engaged with the bidirectional screw (8), and the outer surface of the nut (9) is provided with anti-slip texture.

7. The axial flow fan with dustproof function according to claim 1, characterized in that: The axial flow fan body (1) is equipped with fan blades (10).

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