Anti-backflow plastic fan cover

Abstract

The utility model relates to fan cover technical field discloses anti -regurgitation formula plastic fan cover, include, fan cover, the bottom fixed mounting of fan cover has the protective cover, the inside of protective cover is opened has dust exhaust, support, the inside of fan cover is located support, the left side fixed mounting of support has telescopic link. The beneficial effect of the above technical scheme is: when the external wind force is strong, may appear the phenomenon of backwash, at this time because spring always provides the elastic force to the direction of limit ring extrusion sealing plate to limit ring inside is sealed to prevent the phenomenon of backwash appears, simultaneously because the elastic force of telescopic link is limited, when the fan of fan cover left side starts, the thrust of airflow is greater than the elastic force of telescopic link, airflow will push telescopic link to right side, make sealing plate and limit ring separate, thereby realized preventing external wind force backwash leads to the situation that the fan cannot normally work appears.

Description

Technical Field

[0001] This utility model relates to the field of fan cover technology, and more specifically, to an anti-backflow plastic fan cover. Background Technology

[0002] A fan cover is a casing device installed on ventilation equipment, mainly for protection, and also serves to guide airflow and prevent foreign objects from entering. Conventional exhaust fan covers deflect the horizontal airflow of the ventilation fan downward by about 90 degrees. Apart from preventing rain, they only fix the exhaust direction in a downward direction. Therefore, in strong winds, the external airflow that rises from the bottom to the exhaust port flows back from the exhaust port, interfering with the exhaust fan's effect, or causing the ventilation fan to rotate in reverse and seep into the room, making it difficult to use in strong winds. Utility Model Content

[0003] In order to overcome the shortcomings of the existing technology, this utility model provides an anti-backflow plastic fan cover, which has the advantage of preventing airflow from flowing back into the device.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an anti-backflow plastic fan cover, comprising: a fan cover, wherein a protective cover is fixedly installed at the bottom of the fan cover, and a dustproof exhaust port is provided inside the protective cover; a bracket, wherein the bracket is located inside the fan cover, a telescopic rod is fixedly installed on the left side of the bracket, a spring is sleeved on the outside of the telescopic rod, a sealing plate is fixedly installed on the left side of the spring, and a limit ring is fixedly installed inside the fan cover, the limit ring being located on the left side of the sealing plate.

[0005] The beneficial effects of adopting the above technical solution are as follows: When the external wind force is strong, backflow may occur. At this time, because the spring always provides elastic force to squeeze the sealing plate towards the limiting ring, the inside of the limiting ring is sealed, thereby preventing backflow. At the same time, because the elastic force of the spring is limited, when the fan on the left side of the fan cover is started, the thrust of the airflow is greater than the elastic force of the spring, and the airflow will push the telescopic rod to the right, causing the sealing plate and the limiting ring to separate, thereby preventing the external wind force from backflowing and causing the fan to malfunction.

[0006] As a preferred embodiment of this utility model, there are multiple dustproof exhaust ports, all of which are located at the bottom of the protective cover and are evenly distributed on the surface of the protective cover.

[0007] The beneficial effects of adopting the above technical solution are: the main function of the dustproof exhaust port is to block external dust while ensuring normal ventilation, preventing dust and debris from entering the interior of the fan cover and causing blockage that affects the normal operation of the internal structure.

[0008] As a preferred embodiment of this utility model, the protective cover is rotatably connected to a rotating shaft, and a connecting ring is fixedly installed at the bottom of the rotating shaft. The connecting ring is arc-shaped and fits against the bottom of the protective cover. A brush is fixedly installed on the side of the connecting ring near the protective cover.

[0009] The beneficial effects of adopting the above technical solution are: the connecting ring can rotate at the bottom of the protective cover by the rotation of the shaft and the protective cover. At this time, the brush will clean the multiple dust exhaust ports at the bottom of the protective cover, preventing the surface of the dust exhaust ports from being blocked due to excessive dust, which would affect the normal air permeability.

[0010] As a preferred embodiment of this utility model, there are multiple brushes, each of which is fitted to the protective cover, and each of the multiple brushes is in contact with a plurality of dustproof exhaust ports.

[0011] The beneficial effect of adopting the above technical solution is that multiple brushes, driven by the rotation of the connecting ring, clean the bottom of the protective cover from multiple directions, effectively increasing the overall cleaning efficiency.

[0012] As a preferred embodiment of this utility model, a fixed shaft is fixedly installed at the bottom of the connecting ring, and fan blades are fixedly installed on the outer side of the fixed shaft. There are multiple fan blades, and all of the multiple fan blades are located at the bottom of the connecting ring.

[0013] The beneficial effects of adopting the above technical solution are: when airflow passes through the bottom of the connecting ring, the airflow will blow the fan blades. At the same time, since the fixed shaft and the connecting ring are fixedly connected, after the airflow and the fan blades generate friction, the fixed shaft will drive the connecting ring to rotate, so that the connecting ring has a natural driving effect, ensuring normal cleaning while saving driving resources.

[0014] As a preferred embodiment of this utility model, the bottom of the protective cover is arc-shaped, and the top of the protective cover is sealed.

[0015] The beneficial effects of adopting the above technical solution are: the protective cover is hemispherical in shape, and its main function is to provide a certain degree of rain protection, thereby improving the overall service life of the device.

[0016] As a preferred embodiment of this utility model, the fan cover is inverted L-shape, and the material of the fan cover is plastic.

[0017] The beneficial effects of adopting the above technical solution are: using plastic materials allows for rapid injection molding and facilitates production, while also improving wear resistance to a certain extent.

[0018] As a preferred technical solution of this utility model, the spring has a limited elastic force, which can only push the sealing plate and the limiting ring to close, and after closing, it will not continue to apply elastic force. The wind force of the fan is greater than the elastic force of the spring.

[0019] The beneficial effect of adopting the above technical solution is that the spring force is less than the wind force of the fan, and the spring pushes the sealing plate and the limiting ring to close. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This utility model Figure 1 Enlarged schematic diagram of the structure at point A; Figure 3 This is a schematic diagram of the fan cover structure of this utility model; Figure 4 This utility model Figure 3 Enlarged schematic diagram of the structure at point B; Figure 5 This utility model Figure 3 A magnified schematic diagram of the structure at point C.

[0021] In the diagram: 1. Fan cover; 2. Protective cover; 3. Bracket; 4. Telescopic rod; 5. Spring; 6. Sealing plate; 7. Limiting ring; 8. Dustproof exhaust port; 9. Rotating shaft; 10. Connecting ring; 11. Brush; 12. Fixed shaft; 13. Fan blade. Detailed Implementation

[0022] 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.

[0023] like Figures 1 to 5 As shown, this utility model provides an anti-backflow plastic fan cover, including: a fan cover 1, a protective cover 2 fixedly installed at the bottom of the fan cover 1, and a dustproof exhaust port 8 opened inside the protective cover 2; a bracket 3, the bracket 3 is located inside the fan cover 1, a telescopic rod 4 is fixedly installed on the left side of the bracket 3, a spring 5 is sleeved on the outside of the telescopic rod 4, a sealing plate 6 is fixedly installed on the left side of the spring 5, and a limit ring 7 is fixedly installed inside the fan cover 1, the limit ring 7 is located on the left side of the sealing plate 6.

[0024] The beneficial effects of adopting the above technical solution are as follows: When the external wind force is strong, backflow may occur. At this time, because the spring 5 always provides elastic force to squeeze the sealing plate 6 towards the limiting ring 7, the inside of the limiting ring 7 is sealed, thereby preventing backflow. At the same time, because the elastic force of the spring 5 is limited, when the fan on the left side of the fan cover 1 is started, the thrust of the airflow is greater than the elastic force of the spring 5, and the airflow will push the telescopic rod 4 to the right, causing the sealing plate 6 and the limiting ring 7 to separate, thereby preventing the external wind force from backflowing and causing the fan to malfunction.

[0025] There are multiple dust exhaust ports 8, all of which are located at the bottom of the protective cover 2 and are evenly distributed on the surface of the protective cover 2.

[0026] The beneficial effects of adopting the above technical solution are: the main function of the dustproof exhaust port 8 is to block external dust while ensuring normal ventilation, so as to prevent dust and debris from entering the interior of the fan cover 1 and causing blockage that affects the normal operation of the internal structure.

[0027] The protective cover 2 is rotatably connected to a rotating shaft 9. A connecting ring 10 is fixedly installed at the bottom of the rotating shaft 9. The connecting ring 10 is arc-shaped and fits against the bottom of the protective cover 2. A brush 11 is fixedly installed on the side of the connecting ring 10 near the protective cover 2.

[0028] The beneficial effects of adopting the above technical solution are: the connecting ring 10 can rotate at the bottom of the protective cover 2 through the rotation of the rotating shaft 9 and the protective cover 2. At this time, the brush 11 will clean the multiple dustproof exhaust ports 8 at the bottom of the protective cover 2 to prevent the surface of the dustproof exhaust ports 8 from being blocked due to excessive dust, which would affect the normal air permeability.

[0029] There are multiple brushes 11, each brush 11 is attached to the protective cover 2, and each brush 11 is in contact with multiple dustproof exhaust ports 8.

[0030] The beneficial effect of adopting the above technical solution is that multiple brushes 11, driven by the rotation of the connecting ring 10, clean the bottom of the protective cover 2 from multiple directions, effectively increasing the overall cleaning efficiency.

[0031] The bottom of the connecting ring 10 is fixedly mounted with a fixed shaft 12, and the outside of the fixed shaft 12 is fixedly mounted with fan blades 13. There are multiple fan blades 13, and all multiple fan blades 13 are located at the bottom of the connecting ring 10.

[0032] The beneficial effects of adopting the above technical solution are: when airflow passes through the bottom of the connecting ring 10, the airflow will blow the fan blade 13. At the same time, since the fixed shaft 12 and the connecting ring 10 are fixedly connected, after the airflow and the fan blade 13 generate friction, the fixed shaft 12 will drive the connecting ring 10 to rotate, so that the connecting ring 10 has a natural driving effect, ensuring normal cleaning while saving driving resources.

[0033] The bottom of the protective cover 2 is arc-shaped, and the top of the protective cover 2 is sealed.

[0034] The beneficial effects of adopting the above technical solution are: the protective cover 2 is hemispherical in shape, and its main function is to provide a certain degree of rain protection, thereby improving the overall service life of the device.

[0035] The fan cover 1 is an inverted L-shape, and the material of the fan cover 1 is plastic.

[0036] The beneficial effects of adopting the above technical solution are: using plastic materials allows for rapid injection molding and facilitates production, while also improving wear resistance to a certain extent.

[0037] Among them, the elastic force of spring 5 is less than the wind force of the fan. Spring 5 can push the sealing plate 6 and the limiting ring 7 to close. After the sealing plate 6 and the limiting ring 7 are closed, spring 5 will not continue to apply elastic force.

[0038] The beneficial effects of adopting the above technical solution are: after the sealing plate 6 and the limiting ring 7 are closed, the spring 5 will not continue to apply elastic force, which can effectively prevent the spring 5 from weakening after long-term use, thus ensuring that the sealing plate 6 has the effect of resetting after being blown open.

[0039] Working principle and usage process of this utility model: Firstly, since a telescopic rod 4 is fixedly installed on the left side of the bracket 3, a spring 5 is sleeved on the outside of the telescopic rod 4, a sealing plate 6 is fixedly installed on the left side of the spring 5, and a limiting ring 7 is fixedly installed inside the fan cover 1, with the limiting ring 7 located on the left side of the sealing plate 6, when the external wind force is strong, backflow may occur. At this time, since the spring 5 always provides elastic force to squeeze the sealing plate 6 towards the limiting ring 7, the inside of the limiting ring 7 is sealed, thereby preventing backflow. Meanwhile, since the spring force of spring 5 is limited, when the fan on the left side of the fan cover 1 is started, the thrust of the airflow is greater than the spring force of spring 5. The airflow will push the telescopic rod 4 to the right, causing the sealing plate 6 and the limiting ring 7 to separate, thereby preventing the external wind from flowing back and causing the fan to malfunction. Secondly, a rotating shaft 9 is rotatably connected inside the protective cover 2. A connecting ring 10 is fixedly installed at the bottom of the rotating shaft 9. The connecting ring 10 is arc-shaped and fits against the bottom of the protective cover 2. At the same time, a brush 11 is fixedly installed on the side of the connecting ring 10 close to the protective cover 2. The connecting ring 10 can rotate and rub against the bottom of the protective cover 2 through the rotation of the rotating shaft 9 and the protective cover 2. At this time, the brush 11 will clean the multiple dust exhaust ports 8 at the bottom of the protective cover 2 to prevent the surface of the dust exhaust ports 8 from being blocked due to excessive dust, which would affect the normal air permeability. Finally, the protective cover 2 is hemispherical in shape, which gives it a certain degree of rain protection, thereby improving the overall service life of the device.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An anti-backflow plastic fan cover, characterized in that, include; A fan cover, the bottom of which is fixedly installed with a protective cover, and the inside of the protective cover is provided with a dustproof exhaust port; A bracket is located inside the fan cover. A telescopic rod is fixedly installed on the left side of the bracket. A spring is sleeved on the outside of the telescopic rod. A sealing plate is fixedly installed on the left side of the spring. A limit ring is fixedly installed inside the fan cover. The limit ring is located on the left side of the sealing plate.

2. The anti-backflow plastic fan cover according to claim 1, characterized in that: There are multiple dustproof exhaust ports, all of which are located at the bottom of the protective cover and are evenly distributed on the surface of the protective cover.

3. The anti-backflow plastic fan cover according to claim 1, characterized in that: The protective cover is rotatably connected to a rotating shaft. A connecting ring is fixedly installed at the bottom of the rotating shaft. The connecting ring is arc-shaped and fits against the bottom of the protective cover. A brush is fixedly installed on the side of the connecting ring near the protective cover.

4. The anti-backflow plastic fan cover according to claim 3, characterized in that: There are multiple brushes, each of which is fitted to the protective cover and each of the multiple brushes is in contact with a multiple of the dustproof exhaust ports.

5. The anti-backflow plastic fan cover according to claim 3, characterized in that: A fixed shaft is fixedly installed at the bottom of the connecting ring, and fan blades are fixedly installed on the outside of the fixed shaft. There are multiple fan blades, and all of the multiple fan blades are located at the bottom of the connecting ring.

6. The anti-backflow plastic fan cover according to claim 1, characterized in that: The bottom of the protective cover is arc-shaped, and the top of the protective cover is sealed.

7. The anti-backflow plastic fan cover according to claim 1, characterized in that: The fan cover is in the shape of an inverted L, and the material of the fan cover is plastic.

8. The anti-backflow plastic fan cover according to claim 1, characterized in that: The spring force is less than the wind force of the fan, and the spring pushes the sealing plate to close with the limiting ring.

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