Centrifugal fan with air filtering device

Abstract

A centrifugal fan with an air filtering device comprises a machine shell (8), an air outlet pipe (2) of the machine shell is a rectangular pipe body, the air filtering device is installed in the air outlet pipe, the air filtering device is composed of a filter screen (5) and a frame body (6), the filter screen is connected to the frame body, the frame body is of a bent structure, and the filter screen is bent along with the frame body. The filter screen is characterized in that the filter screen is of a curved surface structure after being bent along with the frame body. The centrifugal fan has the beneficial effects that the surface area of the filter screen is larger than the sectional area of the air outlet pipe, so that the interception amount of particulate matters in air can be greatly increased, the cleaning period of the filter screen is prolonged, and the shutdown frequency of the centrifugal fan is reduced; the air filtering device is convenient to assemble and disassemble, and the filter screen is convenient to clean.

Description

Technical Field

[0001] This utility model relates to a centrifugal fan. Background Technology

[0002] In some situations, it is necessary to filter indoor air using a fan. The structure involves installing a filter screen on the outlet duct of a centrifugal fan. The filter screen is sheet-like, and its area is approximately equal to the cross-sectional area of ​​the outlet duct. After a period of use, particulate matter in the air will quickly accumulate on the filter screen, increasing the resistance to airflow and requiring frequent cleaning of the filter screen. Utility Model Content

[0003] The purpose of this invention is to provide a centrifugal fan with an air filtration device, which can increase the interception of particulate matter in the air and extend the cleaning cycle of the filter screen.

[0004] The technical solution of this utility model is a centrifugal fan with an air filtration device, which includes a housing 8, an air outlet pipe 2 of the housing being a rectangular tube, an air filtration device installed in the air outlet pipe, the air filtration device consisting of a filter screen 5 and a frame 6, the filter screen being connected to the frame, the frame having a curved structure, and the filter screen bending with the frame.

[0005] Its characteristic is that after the filter screen bends with the frame, the filter screen has a curved structure, and the surface area of ​​the filter screen will be larger than the cross-sectional area of ​​the air outlet duct. This can greatly increase the interception of particulate matter in the air, extend the cleaning cycle of the filter screen, and reduce the number of times the centrifugal fan stops. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of the structure of this utility model.

[0007] Figure 2 for Figure 1 A-direction view.

[0008] Figure 3 for Figure 2 View B.

[0009] Attached diagram symbols: 1-Air inlet, 2-Air outlet, 3-Upper wall, 4-Cover plate, 5-Filter screen, 6-Frame, 7-Lower wall, 8-Casing, 9-Frame edge, 10-Side wall, 11-Convex surface, 12-Concave surface, 13-Transition surface, 14-Air supply duct. Detailed Implementation

[0010] A centrifugal fan with an air filtration device includes a housing 8, a circular air inlet 1 on the housing, and a rectangular air outlet 2 on the housing. An air filtration device is installed in the air outlet 2. The air filtration device consists of a filter screen 5 and a frame 6. The filter screen is connected to the frame, and the frame has a curved structure. The filter screen bends with the frame, and the filtration device can be installed at the outlet of the air outlet 2.

[0011] Bending the frame can make the filter screen curved or V-shaped. Compared with the existing flat filter screen, this can increase the filtration area, increase the amount of airborne particles intercepted, and extend the filter screen cleaning cycle.

[0012] To further increase the area of ​​the filter screen, such as Figure 2 As shown, the frame has multiple bends, and the filter screen has multiple convex surfaces 11 and multiple concave surfaces 12 following the bends of the frame. The center part and both ends of the filter screen are convex surfaces, and the concave surfaces are between adjacent convex surfaces.

[0013] Its advantage is that the air in the exhaust duct can flow out not only through the convex and concave surfaces, but also through the transition surface 13 between the convex and concave surfaces, which is perpendicular to the convex and concave surfaces. Airborne particles are intercepted by the convex, concave, and transition surfaces. The area of ​​the convex and concave surfaces is limited by the cross-sectional area of ​​the exhaust duct, but the area of ​​the transition surface is not limited by the cross-sectional area of ​​the exhaust duct. By increasing the length of the transition surface, its area can be increased. The larger the area of ​​the transition surface, the more particles are intercepted. The area of ​​the transition surface 13 is five times the sum of the areas of the convex and concave surfaces.

[0014] In some cases, the centrifugal fan is connected to the external air supply duct 14. When cleaning the filter, the air supply duct needs to be removed. To facilitate the cleaning of the filter, a notch is opened on the upper wall 3 of the air outlet duct. The notch allows the air filter to pass through. The notch is covered by a cover plate 4, which is sealed to the upper wall 3. The bottom of the frame is in contact with the lower wall 7 of the air outlet duct, and the top of the frame is connected to the back of the cover plate. The frame edges 9 at both ends of the frame are respectively inserted into the grooves of the side wall 10 of the air outlet duct.

[0015] When the particles on the filter screen accumulate to a certain amount, the cover can be removed, the filter device taken out, and the particles on the filter screen cleaned. After cleaning, the filter device can be installed on the air outlet duct.

Claims

1. A centrifugal fan with air filter device, comprising a casing, the air outlet pipe (2) of the casing is a rectangular pipe body, an air filter device is installed in the air outlet pipe, characterized in that, The air filtering device is composed of a filtering screen (5) and a frame (6), the filtering screen is connected to the frame, the frame has a curved structure, and the filtering screen is curved along with the frame.

2. The centrifugal fan with an air filter device according to claim 1, characterized in that, The filtering screen is an arc surface.

3. The centrifugal fan with an air filter according to claim 1, characterized in that, The filtering screen is a V-shaped surface.

4. The centrifugal fan with an air filter according to claim 1, characterized in that, The filtering screen has a plurality of convex surfaces (11) and a plurality of concave surfaces (12), the center part and both ends of the filtering screen are convex surfaces, and the adjacent convex surfaces are concave surfaces.

5. The centrifugal fan with an air filter according to claim 4, characterized in that The transition surface (13) between the convex surface and the concave surface has an area of 5 times the sum of the areas of the convex surface and the concave surface.

6. The centrifugal fan with an air filter according to claim 4, characterized in that An opening is formed on the upper wall (3) of the air outlet pipe, the opening can allow the air filtering device to pass through, the opening is covered with a cover plate (4), the cover plate is sealingly connected to the upper wall (3), the bottom of the frame is in contact with the lower wall (7) of the air outlet pipe, the top of the frame is connected to the back of the cover plate, and the frame edges (9) at both ends of the frame are respectively inserted into the grooves in the side walls (10) of the air outlet pipe.

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