Anti-backflow structure of fan

Abstract

The utility model discloses a fan backflow prevention structure, which belongs to the technical field of fan backflow prevention and comprises a fixing block, a fan body is embedded in the fixing block, connecting mechanisms are arranged at the top and the bottom of the fixing block, an air inlet box is arranged on the rear side of the fixing block, and an air outlet box is arranged on the rear side of the fixing block. Three air inlet valve plates are arranged in the air inlet box, and an exhaust mechanism is arranged on the front side of the fixing block; the exhaust mechanism comprises two exhaust valve plates, an exhaust box and four spring hinges, the rear sides of the exhaust valve plates make contact with the front side of the exhaust box, and the four spring hinges are arranged on the two sides of the front side of the top and the two sides of the front side of the bottom of the exhaust box correspondingly. And when a single-layer backflow prevention structure has a jamming fault, backflow prevention work cannot be carried out, and double backflow prevention cannot be carried out on the fan.

Description

Technical Field

[0001] The utility model relates to the technical field of fan anti - reflux, and particularly relates to a fan anti - reflux structure. Background Technique

[0002] Fan anti - reflux refers to taking specific measures in the structural design of a fan to prevent the reverse flow of air in an undesired situation.

[0003] After the applicant retrieved the fan anti - reflux structure, the following problems were found: Most of the existing fan anti - reflux structures are single - layer settings. When a jamming failure occurs in the single - layer anti - reflux structure, the anti - reflux work cannot be carried out, and double anti - reflux for the fan cannot be achieved.

[0004] Therefore, a fan anti - reflux structure is proposed. Content of the Utility Model

[0005] The purpose of the utility model is to provide a fan anti - reflux structure, which can solve the problem that most of the existing fan anti - reflux structures are single - layer settings. When a jamming failure occurs in the single - layer anti - reflux structure, the anti - reflux work cannot be carried out, and double anti - reflux for the fan cannot be achieved.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A fan anti - reflux structure includes a fixed block, a fan body is embedded inside the fixed block, connection mechanisms are arranged on both the top and bottom of the fixed block, an air inlet box is arranged at the rear of the fixed block, an air inlet valve plate is arranged inside the air inlet box, the number of the air inlet valve plates is three, and an exhaust mechanism is arranged at the front of the fixed block;

[0007] The exhaust mechanism includes two exhaust valve plates, an exhaust box and four spring hinges. The rear sides of the exhaust valve plates are in contact with the front side of the exhaust box. The four spring hinges are respectively arranged on both sides of the front side of the top and bottom of the exhaust box. The connection between the exhaust valve plate and the exhaust box is rotationally connected through the spring hinge.

[0008] Preferably, anti - slip strips are fixedly connected to both sides of the air inlet box and the exhaust box, and the number of the anti - slip strips is several.

[0009] Preferably, rotating columns are fixedly connected to both sides of the air inlet valve plate, rotating holes are opened on both sides of the inner wall of the air inlet box, and the rotating columns are rotationally connected inside the rotating holes.

[0010] Preferably, a limiting rod matched with the air inlet valve plate is fixedly connected to the rear side of the air inlet box, the number of the limiting rods is three, and the rear side of the air inlet valve plate is in contact with the front side of the limiting rod.

[0011] Preferably, the connecting mechanism includes two connecting cards, four limiting buttons and two sealing rings. One side of the rear limiting button close to the connecting card passes through the connecting card and extends into the interior of the air inlet box. One side of the front limiting button close to the connecting card passes through the connecting card and extends into the interior of the air exhaust box. One side of the rear sealing ring close to the air inlet box is fixedly connected to the air inlet box. One side of the front sealing ring close to the air exhaust box is fixedly connected to the air exhaust box. The surface of the limiting button is threadedly connected to the interior of the connecting card. One side of the connecting card close to the fixed block is fixedly connected to the fixed block.

[0012] Preferably, the surfaces of the air inlet box and the air exhaust box are in contact with the inner wall of the connecting card, and one side of the sealing ring close to the fixed block is in close contact with the surface of the fixed block.

[0013] Preferably, both the air inlet valve piece and the air exhaust valve piece are made of high-toughness metal.

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

[0015] 1. In this application, when the fan body stops working or there is an air flow backflow, the elastic force of the spring hinge causes the air exhaust valve piece to quickly close, preventing gas backflow. When the air exhaust valve piece gets stuck and cannot reset, and the backflow gas passes through the air exhaust box and the fan body into the interior of the air inlet box, the air inlet valve piece will fall by its own gravity until it contacts the limiting rod, preventing the air inlet valve piece from rotating backward excessively. At this time, the air inlet valve piece can block the air inlet box, preventing the backflow gas from passing through the air inlet box, thus achieving double anti-backflow and avoiding the problem that most existing fans have a single-layer anti-backflow structure. When a single-layer anti-backflow structure fails due to jamming, it cannot perform anti-backflow work and cannot provide double anti-backflow for the fan.

[0016] 2. In this application, when it is necessary to clean the air inlet valve piece and the air exhaust valve piece, removing the limiting buttons can separate the air inlet box and the air exhaust box from the fixed block, making it convenient to clean the air inlet valve piece and the air exhaust valve piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the overall structure diagram of the fan anti-backflow structure of the present utility model;

[0018] Figure 2 is the three-dimensional internal structure schematic diagram of the air exhaust box in the present utility model;

[0019] Figure 3 is the three-dimensional exploded schematic diagram of the air exhaust box and the limiting button in the present utility model;

[0020] Figure 4 is the three-dimensional structure schematic diagram of the rear side of the air inlet box in the present utility model;

[0021] Figure 5 of the present utility modelFigure 4 Partial enlarged view at position A in the figure;

[0022] Figure 6 Schematic three-dimensional connection diagram of the intake valve sheet and the rotating column in the present utility model;

[0023] Figure 7 The present utility model Figure 4 Partial enlarged view at position B in the figure.

[0024] In the figure, 1 is a fixed block; 2 is an exhaust mechanism; 201 is an exhaust valve sheet; 202 is an exhaust box; 203 is a spring hinge; 3 is a rotating hole; 4 is a limiting rod; 5 is an intake box; 6 is a connecting mechanism; 601 is a connecting card; 602 is a limiting button; 603 is a sealing ring; 7 is a fan body; 8 is an anti-slip strip; 9 is an intake valve sheet; 10 is a rotating column. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] Please refer to Figures 1-7 , the present utility model provides a technical solution:

[0027] A fan anti-backflow structure includes a fixed block 1, a fan body 7 is embedded inside the fixed block 1, connecting mechanisms 6 are arranged on both the top and bottom of the fixed block 1, an intake box 5 is arranged at the rear side of the fixed block 1, an intake valve sheet 9 is arranged inside the intake box 5, the number of the intake valve sheets 9 is three, and an exhaust mechanism 2 is arranged at the front side of the fixed block 1;

[0028] The exhaust mechanism 2 includes two exhaust valve sheets 201, an exhaust box 202 and four spring hinges 203. The rear side of the exhaust valve sheet 201 contacts the front side of the exhaust box 202. The four spring hinges 203 are respectively arranged on both sides of the front side of the top and bottom of the exhaust box 202. The connection part between the exhaust valve sheet 201 and the exhaust box 202 is rotationally connected through the spring hinge 203.

[0029] In this embodiment: When the fan body 7 stops working or there is air flow backflow, the elastic force of the spring hinge 203 causes the exhaust valve piece 201 to quickly close, preventing gas backflow. When the exhaust valve piece 201 gets stuck and cannot reset, and the backflow gas passes through the exhaust box 202 and the fan body 7 into the intake box 5, the intake valve piece 9 will fall by its own gravity until it contacts the limit rod 4, preventing the intake valve piece 9 from rotating excessively backward. At this time, the intake valve piece 9 can block the intake box 5, preventing the backflow gas from passing through the intake box 5, thus achieving double anti-backflow and avoiding the problem that most existing fan anti-backflow structures are single-layered and cannot perform anti-backflow work when the single-layer anti-backflow structure has a jamming failure, and cannot provide double anti-backflow for the fan.

[0030] Specifically, as Figure 1 and Figure 3 shown, anti-slip strips 8 are fixedly connected to both sides of the intake box 5 and the exhaust box 202, and the number of anti-slip strips 8 is several.

[0031] Specifically, as Figure 6 and Figure 7 shown, rotating columns 10 are fixedly connected to both sides of the intake valve piece 9, and rotating holes 3 are formed on both sides of the inner wall of the intake box 5, and the rotating columns 10 are rotatably connected inside the rotating holes 3.

[0032] Specifically, as Figure 4 and Figure 7 shown, a limit rod 4 that cooperates with the intake valve piece 9 is fixedly connected to the rear side of the intake box 5. The number of limit rods 4 is three, and the rear side of the intake valve piece 9 contacts the front side of the limit rod 4.

[0033] In this embodiment: The anti-slip strips 8 on both sides of the intake box 5 and the exhaust box 202 play an anti-slip role, facilitating the holding of the intake box 5 and the exhaust box 202 and facilitating the installation of the intake box 5 and the exhaust box 202. By rotatably connecting the rotating columns 10 inside the rotating holes 3, the rotating columns 10 and the intake valve piece 9 can rotate, and the intake valve piece 9 will fall by its own gravity until it contacts the limit rod 4, preventing the intake valve piece 9 from rotating excessively backward.

[0034] Specifically, as Figure 3 and Figure 5As shown, the connecting mechanism 6 includes two connecting cards 601, four limiting buttons 602 and two sealing rings 603. The side of the rear limiting button 602 close to the connecting card 601 passes through the connecting card 601 and extends into the interior of the air inlet box 5. The side of the front limiting button 602 close to the connecting card 601 passes through the connecting card 601 and extends into the interior of the exhaust box 202. The side of the rear sealing ring 603 close to the air inlet box 5 is fixedly connected to the air inlet box 5. The side of the front sealing ring 603 close to the exhaust box 202 is fixedly connected to the exhaust box 202. The surface of the limiting button 602 is threadedly connected to the interior of the connecting card 601. The side of the connecting card 601 close to the fixed block 1 is fixedly connected to the fixed block 1.

[0035] Specifically, as Figure 1 shown, the surfaces of the air inlet box 5 and the exhaust box 202 are both in contact with the inner wall of the connecting card 601. The side of the sealing ring 603 close to the fixed block 1 is in close contact with the surface of the fixed block 1.

[0036] Specifically, as Figure 1 and Figure 4 shown, both the air inlet valve plate 9 and the exhaust valve plate 201 are made of high-toughness metal.

[0037] In this embodiment: The sealing ring 603 is in close contact with the fixed block 1, ensuring the sealing between the air inlet box 5, the exhaust box 202 and the fixed block 1, preventing gas leakage. When it is necessary to clean the air inlet valve plate 9 and the exhaust valve plate 201, removing the limiting button 602 can separate the air inlet box 5 and the exhaust box 202 from the fixed block 1, making it convenient to clean the air inlet valve plate 9 and the exhaust valve plate 201. Since both the air inlet valve plate 9 and the exhaust valve plate 201 are made of high-toughness metal, the air inlet valve plate 9 and the exhaust valve plate 201 are more durable, avoiding the occurrence of fragmentation.

[0038] Working principle: When the fan body 7 is working, it sucks in air from the intake box 5 at the rear. Due to the suction force of the fan body 7, the three intake valve plates 9 in the intake box 5 rotate around the rotating column 10 under the action of the air flow, thus opening the intake passage. The air passes through the fan body 7 and is discharged from the exhaust mechanism 2 at the front. The air flow pushes open the exhaust valve plate 201, and the exhaust valve plate 201 is rotatably connected to the exhaust box 202 through the spring hinge 203, enabling the air flow to pass through the exhaust box 202 smoothly. When the fan body 7 stops working or there is an air flow backflow, the elastic force of the spring hinge 203 causes the exhaust valve plate 201 to quickly close, preventing gas backflow. When the exhaust valve plate 201 gets stuck and cannot reset, and the backflow gas passes through the exhaust box 202 and the fan body 7 into the interior of the intake box 5, the intake valve plate 9 will fall by its own gravity until it contacts the limit rod 4, preventing the intake valve plate 9 from rotating backward excessively. At this time, the intake valve plate 9 can block the intake box 5, preventing the backflow gas from passing through the intake box 5, thus enabling double anti-backflow. This avoids the problem that most of the existing fan anti-backflow structures are single-layer settings, and when a single-layer anti-backflow structure fails due to jamming, it cannot perform the anti-backflow work and cannot provide double anti-backflow for the fan. The connection clip 601 is connected to the fixed block 1, the connection clip 601 clamps the intake box 5 and the exhaust box 202, and is tightened and fixed by the limit button 602. The sealing ring 603 is in close contact with the fixed block 1, ensuring the sealing between the intake box 5, the exhaust box 202 and the fixed block 1, preventing gas leakage. The anti-slip strips 8 on both sides of the intake box 5 and the exhaust box 202 play an anti-slip role, facilitating the holding of the intake box 5 and the exhaust box 202 and facilitating the installation of the intake box 5 and the exhaust box 202. When it is necessary to clean the intake valve plate 9 and the exhaust valve plate 201, removing the limit button 602 can separate the intake box 5 and the exhaust box 202 from the fixed block 1, making it convenient to clean the intake valve plate 9 and the exhaust valve plate 201.

[0039] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fan backflow prevention structure, comprising a fixing block (1), characterized in that: A fan body (7) is embedded inside the fixing block (1); a connection mechanism (6) is provided at the top and bottom of the fixing block (1); an air intake box (5) is provided at the rear side of the fixing block (1); an air intake valve sheet (9) is provided inside the air intake box (5); and three air intake valve sheets (9) are provided; an exhaust mechanism (2) is provided at the front side of the fixing block (1); The exhaust mechanism (2) comprises two exhaust valve plates (201), an exhaust box (202) and four spring hinges (203); the rear side of the exhaust valve plate (201) contacts the front side of the exhaust box (202); the four spring hinges (203) are respectively arranged on both sides of the front side of the top and bottom of the exhaust box (202); and the connection between the exhaust valve plate (201) and the exhaust box (202) is rotatably connected via the spring hinges (203).

2. A fan backflow prevention structure according to claim 1, characterized in that: Anti-slip strips (8) are fixedly connected to both sides of the air inlet box (5) and the exhaust box (202), and the number of the anti-slip strips (8) is several.

3. The fan backflow prevention structure according to claim 1, characterized in that: Rotating posts (10) are fixedly connected to both sides of the air intake valve plate (9), rotating holes (3) are opened on both sides of the inner wall of the air intake box (5), and the rotating posts (10) are rotatably connected inside the rotating holes (3).

4. The fan backflow prevention structure according to claim 1, characterized in that: A limiting rod (4) used in conjunction with an intake valve plate (9) is fixedly connected to the rear side of the intake box (5), the limiting rod (4) being three in number, and the rear side of the intake valve plate (9) is in contact with the front side of the limiting rod (4).

5. The fan backflow prevention structure according to claim 1, characterized in that: The connection mechanism (6) comprises two connection cards (601), four limit buttons (602) and two sealing rings (603); a side of the rear limit button (602) close to the connection card (601) passes through the connection card (601) and extends to the interior of the air intake box (5); a side of the front limit button (602) close to the connection card (601) passes through the connection card (601) and extends to the interior of the exhaust box (202); a side of the rear sealing ring (603) close to the air intake box (5) is fixedly connected to the air intake box (5); a side of the front sealing ring (603) close to the exhaust box (202) is fixedly connected to the exhaust box (202); a surface of the limit button (602) is connected to the inner thread of the connection card (601); and a side of the connection card (601) close to the fixed block (1) is fixedly connected to the fixed block (1).

6. A fan backflow prevention structure according to claim 5, characterized in that: The surfaces of the air inlet box (5) and the exhaust box (202) are in contact with the inner wall of the connection card (601), and the side of the sealing ring (603) close to the fixing block (1) is in close contact with the surface of the fixing block (1).

7. The fan backflow prevention structure according to claim 1, characterized in that: The intake valve plate (9) and the exhaust valve plate (201) are both made of high-toughness metal.

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