Louver structure of negative pressure fan

Abstract

The utility model discloses a shutter structure of a negative pressure fan, which relates to the technical field of negative pressure fans, aims to solve the technical problem that blades of a current shutter are easy to shake, and comprises a negative pressure fan main body and a shutter main body. By designing the flow stabilizing structure, when the negative pressure fan main body is used, airflow exhausted by the negative pressure fan main body can pass through the trumpet-shaped flow guide cover of the flow guide structure, enters the large end from the small end and is exhausted, and in the process, the airflow can smoothly transit along the curved surface of the trumpet-shaped flow guide cover and uniformly flow to the blades of the shutter main body; therefore, the irregular acting force of airflow on the blades of the shutter body is reduced, a person can correspondingly adjust the angle of the trumpet-shaped flow guide cover through the adjusting structure according to the inclination of the blades of the shutter body, and therefore the airflow can be discharged more smoothly in the opening direction of the blades of the shutter body. And the irregular acting force of the airflow on the blades of the shutter main body is further reduced.

Description

Technical Field

[0001] This utility model relates to the field of negative pressure fan technology, and more specifically, to a louver structure for a negative pressure fan. Background Technology

[0002] Negative pressure fans utilize the cooling principle of air convection and negative pressure ventilation. They are machines that naturally draw in fresh air from the opposite side of the installation location—doors or windows—and quickly force the hot, stuffy air from the room to the outside. They can improve any poor ventilation problem, with a cooling and ventilation effect of 90%-97%. During the use of negative pressure fans, in order to protect the fans and prevent dust and rainwater from entering, a louver structure, i.e., louvers, is usually installed on the negative pressure fans.

[0003] Existing louvers are usually installed directly on the exhaust side of negative pressure fans. However, during use, the airflow discharged by the negative pressure fan is irregular and is prone to local turbulence and impact. Therefore, when the airflow passes through the louvers, it will exert irregular forces on the louver blades, which will cause the louver blades to vibrate and shake, generating a lot of noise and greatly affecting its performance. In view of this, we propose a louver structure for negative pressure fans. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology, adapt to the needs of reality, and provide a louver structure for a negative pressure fan to solve the technical problem that the louver blades are prone to vibration and shaking.

[0005] To solve the above technical problems, this utility model provides the following technical solution: a louver structure for a negative pressure fan, comprising a negative pressure fan body and a louver body, wherein a flow stabilizing structure is arranged between the negative pressure fan body and the louver body, the flow stabilizing structure includes a connecting frame, a flow guiding structure is arranged inside the connecting frame, and an adjustment structure is symmetrically arranged on the front side of the top and bottom of the flow guiding structure, the adjustment structure being connected to the connecting frame;

[0006] The front opening of the flow guide structure is provided with a stabilizing structure, which includes a mounting ring and a cooperating support structure. The cooperating support structure is symmetrically arranged on both sides inside the connecting frame. The mounting ring is arranged between the two sets of cooperating support structures and is located at the opening of the flow guide structure. A flow straightening grid is arranged inside the mounting ring.

[0007] This invention, through the design of a flow-stabilizing structure, ensures that when the negative pressure fan is in use, the airflow discharged from the fan passes through a funnel-shaped guide shroud, entering from the small end and exiting from the large end. During this process, the airflow smoothly transitions along the curved surface of the funnel-shaped guide shroud, flowing evenly towards the louver blades, thereby reducing the irregular force exerted by the airflow on the louver blades. Furthermore, the angle of the funnel-shaped guide shroud can be adjusted according to the tilt of the louver blades, allowing the airflow to exit more smoothly along the opening direction of the louver blades, further reducing the irregular force exerted by the airflow on the louver blades. This prevents vibration and shaking of the louver blades during the operation of the negative pressure fan, reducing noise. This invention also incorporates a stabilizing structure with two sets of cooperating support structures. The mounting ring between the components connects to the opening of the horn-shaped air guide. When the horn-shaped air guide is adjusted up and down, the connecting rod moves synchronously on the mounting plate with the T-shaped arc groove on the arc surface of the mounting plate, the connecting end block of the connecting rod, and the second roller shaft. This provides stable support for both sides of the horn-shaped air guide, ensuring its stability and airflow guiding effect. Furthermore, a flow-rectifying grille is installed in the mounting ring. This grille further tidies up the airflow after it has passed through the horn-shaped air guide, ensuring uniform resistance as the airflow passes through. Therefore, the combination of the flow-rectifying grille and the horn-shaped air guide provides better airflow guidance and tidying, further reducing the irregular effect of the airflow on the louver blades, reducing blade vibration, and improving the overall performance and stability of the negative pressure fan.

[0008] Preferably, the connecting frame is rectangular, and the front opening of the connecting frame is connected to the main body of the louver. A circular interface is provided in the center of the rear side of the connecting frame, and the circular interface is connected to the exhaust port of the negative pressure fan.

[0009] Preferably, the flow guiding structure includes a corrugated connecting pipe and a horn-shaped flow guide shroud, with the rear port of the corrugated connecting pipe arranged at the circular interface and the horn-shaped flow guide shroud arranged at the front port of the corrugated connecting pipe.

[0010] Preferably, the adjustment structure includes an electric push rod, a push guide frame, and a push rod. The electric push rod is arranged on the connecting frame, the push guide frame is arranged on the horn-shaped flow guide, and the push guide frame and the horn-shaped flow guide are inclinedly corresponding. The push rod is movably arranged on the push guide frame, and the piston end of the electric push rod is connected to the push rod.

[0011] Preferably, the pusher frame has a T-shaped cavity, and the bottom end of the push rod extending into the T-shaped cavity is rotatably arranged with a first roller shaft, and the first roller shaft and the push rod are combined in a T-shape, with the first roller shaft located inside the T-shaped cavity.

[0012] Preferably, the supporting structure includes a connecting rod and a mounting plate. The mounting plate is arranged on the connecting frame. The front side of the mounting plate is an arc surface, and a T-shaped arc groove is formed on the arc surface. The connecting rod is arranged on the mounting ring. A connecting end block is arranged at one end of the connecting rod facing the mounting plate, and a second roller shaft is rotatably arranged at one end of the connecting end block. The second roller shaft is located in the T-shaped arc groove.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model, through the design of a flow-stabilizing structure, ensures that when the negative pressure fan is in use, the airflow discharged from the fan passes through a funnel-shaped guide shroud, entering from the small end and exiting from the large end. During this process, the airflow smoothly transitions along the curved surface of the funnel-shaped guide shroud, flowing evenly towards the louver blades. This reduces the irregular force exerted by the airflow on the louver blades. Furthermore, personnel can adjust the angle of the funnel-shaped guide shroud according to the inclination of the louver blades, allowing the airflow to exit more smoothly along the opening direction of the louver blades, further reducing the irregular force exerted by the airflow on the louver blades. This prevents the louver blades from vibrating and shaking during the operation of the negative pressure fan, reducing noise and solving the technical problem of easy vibration and shaking of louver blades. Therefore, this utility model has the advantage of low noise.

[0015] 2. This utility model also features a robust structure. The mounting ring between the two sets of supporting structures in this robust structure connects to the opening of the horn-shaped air guide. When the horn-shaped air guide is adjusted up and down, the connecting rod moves synchronously on the mounting plate with the T-shaped groove on the arc surface of the mounting plate, the connecting end block of the connecting rod, and the second roller shaft. This provides stable support for both sides of the horn-shaped air guide, ensuring its stability and thus guaranteeing its airflow guiding effect. Furthermore, a flow-rectifying grille is installed in the mounting ring. This grille further refines the airflow after it has passed through the horn-shaped air guide, ensuring uniform resistance as the airflow passes through. Therefore, the combination of the flow-rectifying grille and the horn-shaped air guide provides better airflow guidance and refinement, further reducing the irregular action of the airflow on the louver blades, reducing blade vibration, and improving the overall performance and stability of the negative pressure fan. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the current stabilization structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the connecting frame structure of this utility model;

[0020] Figure 5 This is a schematic diagram of the flow guiding structure of this utility model;

[0021] Figure 6 This is a schematic diagram of the adjustment structure of this utility model;

[0022] Figure 7 This is a schematic diagram of the stable structure of this utility model;

[0023] Figure 8 This is a schematic diagram of the supporting structure of this utility model.

[0024] Explanation of the labels in the diagram:

[0025] 1. Negative pressure fan body; 2. Louver body; 3. Flow stabilizing structure; 4. Connecting frame; 401. Circular interface; 5. Flow guiding structure; 501. Corrugated connecting pipe; 502. Horn-shaped flow guide cover; 6. Adjustment structure; 7. Stabilizing structure; 8. Electric push rod; 9. Push guide frame; 901. T-shaped cavity; 10. Push rod; 1001. First roller shaft; 11. Mounting ring; 1101. Rectifying grid; 12. Matching support structure; 13. Connecting rod; 1301. Connecting end block; 1302. Second roller shaft; 14. Mounting plate; 1401. Arc surface; 1402. T-shaped arc groove. Detailed Implementation

[0026] like Figures 1 to 8 As shown, this utility model relates to a louver structure for a negative pressure fan, including a negative pressure fan body 1 and a louver body 2. A flow stabilizing structure 3 is arranged between the negative pressure fan body 1 and the louver body 2. The flow stabilizing structure 3 includes a connecting frame 4, and a flow guiding structure 5 is arranged inside the connecting frame 4. Adjustment structures 6 are symmetrically arranged on the front sides of the top and bottom of the flow guiding structure 5, and the adjustment structures 6 are connected to the connecting frame 4. The connecting frame 4 is rectangular, and the front opening of the connecting frame 4 is connected to the louver body 2. A circular interface 401 is opened in the center of the rear side of the connecting frame 4, and the circular interface 401 is connected to the exhaust port of the negative pressure fan body 1. The flow guiding structure 5 includes a corrugated connecting pipe 501 and a trumpet-shaped flow guide shroud 502. The rear port of the corrugated connecting pipe 501 is arranged at the circular interface 401, and the trumpet-shaped flow guide shroud 502 is arranged at the front port of the corrugated connecting pipe 501.

[0027] When the negative pressure fan body 1 is in use, the airflow discharged from the negative pressure fan body 1 will pass through the trumpet-shaped guide shroud 502 of the guide structure 5, entering from the small end and exiting from the large end. During this process, the airflow can smoothly transition along the curved surface of the trumpet-shaped guide shroud 502 and flow evenly to the louver body 2 blades, thereby reducing the irregular force of the airflow on the louver body 2 blades. In addition, personnel can adjust the up and down angle of the trumpet-shaped guide shroud 502 according to the tilt of the louver body 2 blades by adjusting the structure 6, so that the airflow can be discharged more smoothly along the opening direction of the louver body 2 blades, further reducing the irregular force of the airflow on the louver body 2 blades. This can avoid the louver body 2 blades from vibrating and shaking when the negative pressure fan body 1 is in use, and reduce noise.

[0028] Specifically, the adjustment structure 6 includes an electric push rod 8, a pusher frame 9, and a push rod 10. The electric push rod 8 is arranged on the connecting frame 4, the pusher frame 9 is arranged on the horn-shaped guide shroud 502, and the pusher frame 9 and the horn-shaped guide shroud 502 are inclined to correspond. The push rod 10 is movably arranged on the pusher frame 9, and the piston end of the electric push rod 8 is connected to the push rod 10. A T-shaped cavity 901 is opened on the pusher frame 9, and a first roller shaft 1001 is rotatably arranged at the bottom end of the push rod 10 that extends into the T-shaped cavity 901. The first roller shaft 1001 and the push rod 10 are combined to form a T-shape. The first roller shaft 1001 is located inside the T-shaped cavity 901; the push rod 10 can be stably positioned in the pusher frame 9 with the cooperation of the first roller shaft 1001 and the T-shaped cavity 901. The extension and retraction of the electric push rod 8 can drive the push rod 10 to move back and forth. Because the pusher frame 9 is arranged at an angle, as the push rod 10 moves, it will drive the horn-shaped guide shroud 502 to rotate up and down, thereby realizing the adjustment of the up and down angle of the horn-shaped guide shroud 502. It should be noted that in the two sets of adjustment structures 6, one set of electric push rods 8 extends and the other set shortens, and their extension and retraction are opposite.

[0029] In an embodiment of this utility model, a stabilizing structure 7 is arranged at the front opening of the flow guiding structure 5. The stabilizing structure 7 includes a mounting ring 11 and a cooperating support structure 12. The cooperating support structure 12 is symmetrically arranged on both sides inside the connecting frame 4. The mounting ring 11 is arranged between the two sets of cooperating support structures 12 and at the opening of the flow guiding structure 5. A flow rectifier grille 1101 is arranged inside the mounting ring 11. The cooperating support structure 12 includes a connecting rod 13 and a mounting plate 14. The mounting plate 14 is arranged on the connecting frame 4. The front side of the mounting plate 14 is an arc surface 1401, and a T-shaped arc groove 1402 is provided on the arc surface 1401. The connecting rod 13 is arranged on the mounting ring 11. A connecting end block 1301 is arranged at one end of the connecting rod 13 facing the mounting plate 14, and a second roller shaft 1302 is rotatably arranged at one end of the connecting end block 1301. The second roller shaft 1302 is located inside the T-shaped arc groove 1402.

[0030] When the up and down angle of the horn-shaped guide shroud 502 is adjusted, with the cooperation of the T-shaped arc groove 1402 of the arc surface 1401 of the mounting plate 14, the connecting end block 1301 of the connecting rod 13, and the second roller shaft 1302, the connecting rod 13 will move synchronously on the mounting plate 14 with the horn-shaped guide shroud 502. This can achieve stable support on both sides of the horn-shaped guide shroud 502, thus ensuring the stability of the horn-shaped guide shroud 502 and ensuring the stable effect of the horn-shaped guide shroud 502 on airflow guidance. In addition, the rectifier grille 1101 in the mounting ring 11 can further tidy up the airflow after it has been guided by the horn-shaped guide shroud 502, ensuring that the airflow encounters uniform resistance when passing through. Therefore, the rectifier grille 1101 and the horn-shaped guide shroud 502 can achieve a better airflow guidance and tidying effect, further reducing the irregular effect of the airflow on the blades of the louver body 2, reducing blade vibration, and improving the overall performance and stability of the negative pressure fan body 1.

[0031] Working principle: This embodiment provides a louver structure for a negative pressure fan. First, when the negative pressure fan body 1 is in use, the airflow discharged from the negative pressure fan body 1 will pass through the trumpet-shaped guide shroud 502 of the guide structure 5, entering from the small end and exiting from the large end. During this process, the airflow can smoothly transition along the curved surface of the trumpet-shaped guide shroud 502 and flow evenly to the blades of the louver body 2, thereby reducing the irregular force of the airflow on the blades of the louver body 2. In addition, the personnel can adjust the up and down angle of the trumpet-shaped guide shroud 502 according to the tilt of the blades of the louver body 2 by adjusting the structure 6, so that the airflow can be discharged more smoothly along the opening direction of the blades of the louver body 2, further reducing the irregular force of the airflow on the blades of the louver body 2, thereby avoiding the vibration and shaking of the blades of the louver body 2 when the negative pressure fan body 1 is in use, and reducing noise.

[0032] Secondly, when the up and down angle of the horn-shaped guide shroud 502 is adjusted, with the cooperation of the T-shaped arc groove 1402 of the arc surface 1401 of the mounting plate 14, the connecting end block 1301 of the connecting rod 13, and the second roller shaft 1302, the connecting rod 13 will move synchronously on the mounting plate 14 with the horn-shaped guide shroud 502. This can achieve stable support on both sides of the horn-shaped guide shroud 502, thus ensuring the stability of the horn-shaped guide shroud 502 and ensuring the stable effect of the horn-shaped guide shroud 502 on airflow guidance. In addition, the rectifier grille 1101 in the mounting ring 11 can further tidy up the airflow after it has been guided by the horn-shaped guide shroud 502, ensuring that the airflow encounters uniform resistance when passing through. Therefore, the cooperation between the rectifier grille 1101 and the horn-shaped guide shroud 502 can achieve a better airflow guidance and tidying effect, further reducing the irregular effect of the airflow on the blades of the louver body 2, reducing blade vibration, and improving the overall performance and stability of the negative pressure fan body 1.

[0033] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of this utility model based on the above embodiments and make different extensions and variations. However, as long as they do not depart from the spirit of this utility model, they are all within the protection scope of this utility model.

Claims

1. A louver structure for a negative pressure fan, characterized in that, It includes a negative pressure fan body (1) and a louver body (2). A flow stabilizing structure (3) is arranged between the negative pressure fan body (1) and the louver body (2). The flow stabilizing structure (3) includes a connecting frame (4). A flow guiding structure (5) is arranged inside the connecting frame (4). An adjustment structure (6) is symmetrically arranged on the front side of the top and bottom of the flow guiding structure (5). The adjustment structure (6) is connected to the connecting frame (4). The front opening of the flow guiding structure (5) is provided with a stabilizing structure (7). The stabilizing structure (7) includes an mounting ring (11) and a cooperating support structure (12). The cooperating support structure (12) is symmetrically arranged on both sides inside the connecting frame (4). The mounting ring (11) is arranged between the two sets of cooperating support structures (12). The mounting ring (11) is arranged at the opening of the flow guiding structure (5). A flow straightening grid (1101) is arranged inside the mounting ring (11).

2. The louver structure of a negative pressure fan according to claim 1, characterized in that, The connecting frame (4) is rectangular, and the front opening of the connecting frame (4) is connected to the louver body (2). A circular interface (401) is provided in the center of the rear side of the connecting frame (4), and the circular interface (401) is connected to the exhaust port of the negative pressure fan body (1).

3. The louver structure of a negative pressure fan according to claim 2, characterized in that, The flow guiding structure (5) includes a corrugated connecting pipe (501) and a horn-shaped flow guide (502). The rear port of the corrugated connecting pipe (501) is arranged at the circular interface (401), and the horn-shaped flow guide (502) is arranged at the front port of the corrugated connecting pipe (501).

4. The louver structure of a negative pressure fan according to claim 3, characterized in that, The adjustment structure (6) includes an electric push rod (8), a pusher frame (9), and a push rod (10). The electric push rod (8) is arranged on the connecting frame (4). The pusher frame (9) is arranged on the horn-shaped flow guide (502), and the pusher frame (9) and the horn-shaped flow guide (502) are inclined to correspond. The push rod (10) is movably arranged on the pusher frame (9). The piston end of the electric push rod (8) is connected to the push rod (10).

5. The louver structure of a negative pressure fan according to claim 4, characterized in that, The pusher frame (9) has a T-shaped cavity (901). The bottom end of the push rod (10) that extends into the T-shaped cavity (901) is rotatably arranged with a first roller (1001). The first roller (1001) and the push rod (10) are combined in a T-shape. The first roller (1001) is located inside the T-shaped cavity (901).

6. The louver structure of a negative pressure fan according to claim 1, characterized in that, The supporting structure (12) includes a connecting rod (13) and a mounting plate (14). The mounting plate (14) is arranged on the connecting frame (4). The front side of the mounting plate (14) is an arc surface (1401), and a T-shaped arc groove (1402) is provided on the arc surface (1401). The connecting rod (13) is arranged on the mounting ring (11). A connecting end block (1301) is arranged at one end of the connecting rod (13) facing the mounting plate (14), and a second roller shaft (1302) is rotatably arranged at one end of the connecting end block (1301). The second roller shaft (1302) is located in the T-shaped arc groove (1402).

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