Air filtering fan

Abstract

An air filtering fan is used for filtering particulate matter in air and comprises a machine shell, an impeller (12) is arranged in the machine shell and provided with a left cover (6) and a right cover (8), blades (7) are connected between the left cover and the right cover, an air inlet pipe (1) is inserted into the left side wall of the machine shell, and the air inlet pipe penetrates through the left cover and extends into the impeller. A plurality of strip-shaped grooves (3) are evenly distributed in the outer circle of the portion, stretching into the impeller, of the air inlet pipe, the interval size between every two adjacent strip-shaped grooves is far smaller than the width size of the strip-shaped grooves, the air inlet pipe is fixedly sleeved with a filter net bag (2), the strip-shaped grooves are covered with the waist of the filter net bag, and the right end of the air inlet pipe is covered with the bag bottom of the filter net bag. The area of a filter screen in the prior art is approximately equal to the sectional area of an inlet pipe, and the filter component is of a mesh bag structure, so that the filter component has the beneficial effects that the filter area of the mesh bag structure is equal to the surface area of a mesh bag, the interception amount of particulate matters in air can be greatly improved, and the cleaning period of the filter screen is prolonged.

Description

Technical Field

[0001] This utility model relates to a centrifugal fan, specifically a centrifugal fan for filtering air. Background Technology

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

[0003] The purpose of this invention is to provide an air filtration fan that can increase the amount of particulate matter intercepted in the air and extend the cleaning cycle of the filter screen.

[0004] The technical solution of this utility model is an air filtration fan, which includes a housing, an impeller 12 disposed in the housing, the impeller having a left cover 6 and a right cover 8, blades 7 connecting the left cover 6 and the right cover 8, an air inlet pipe 1 inserted on the left side wall of the housing, the air inlet pipe passing through the left cover and extending into the impeller, characterized in that multiple strip grooves 3 are evenly distributed on the outer circle of the part of the air inlet pipe extending into the impeller, the spacing between adjacent strip grooves is much smaller than the width of the strip grooves, a filter bag 2 is fixedly fitted on the air inlet pipe, the waist of the filter bag covers the strip grooves, and the bottom of the filter bag covers the right end of the air inlet pipe.

[0005] The filter area of ​​existing technology is roughly equal to the cross-sectional area of ​​the inlet pipe. The filter component of this utility model is a mesh bag structure. Its beneficial effect is that the filter area of ​​the mesh bag structure is the surface area of ​​the mesh bag, which can greatly improve the interception of particulate matter in the air and extend the cleaning cycle of the filter. 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 sectional view along the AA direction.

[0008] Attached diagram symbols: 1-Inlet pipe, 2-Filter bag, 3-Strip groove, 4-Sleeve, 5-Casing, 6-Left cover, 7-Blade, 8-Right cover, 9-Motor, 10-Shaft sleeve, 11-Base, 12-Impeller. Detailed Implementation

[0009] An air filtration fan includes a housing 5, an impeller 12 disposed within the housing, the impeller having a left cover 6 and a right cover 8, with multiple blades 7 symmetrically connected between the left cover 6 and the right cover 8, an air inlet pipe 1 inserted into the left side wall of the housing, the air inlet pipe passing through the left cover and extending into the impeller, characterized in that multiple strip grooves 3 are evenly distributed on the outer circumference of the part of the air inlet pipe extending into the impeller, the spacing between adjacent strip grooves being much smaller than the width of the strip grooves, a filter bag 2 is fixedly fitted onto the air inlet pipe, the waist of the filter bag covering the strip grooves, and the bottom of the filter bag covering the right end of the air inlet pipe.

[0010] The filter bag is made of woven metal wire, but can also be made of filter cloth. The filter bag is fastened to the air inlet duct by clamps 13.

[0011] A bushing 10 extends to the right from the right cover of the impeller. The bushing protrudes from the right wall of the housing and is connected to the shaft of the motor 9. The motor and the housing are fixedly connected to the base 11.

[0012] The inner edge of the blade can be arc-shaped, and when the impeller rotates, the rotation trajectory of the inner edge of the blade is trumpet-shaped.

[0013] To improve filtration efficiency, the blades are rectangular, with the inner edge of the blade parallel to the air inlet duct, and a gap between the inner edge of the blade and the air inlet duct. The rotation trajectory of the inner edge of the blade is cylindrical.

[0014] The smaller the spacing between adjacent strip grooves, the wider the strip grooves, and the larger the area of ​​particles intercepted by the filter bag. The spacing between adjacent strip grooves can be selected from 2 to 5 mm, and the spacing between adjacent strip grooves is preferably 3 mm. The ratio of the spacing between strip grooves to the width of the strip grooves is 1:5 to 1:10, preferably 1:8.

[0015] When the motor drives the impeller to rotate, outside air enters the inlet duct, passes through the waist and bottom of the filter bag, and then enters the blades. Particulate matter in the air is trapped in the filter bag. Compared to existing sheet filters, the filter bag can trap a greater amount of particulate matter. When a certain amount of particulate matter accumulates in the filter bag, the inlet duct is removed to clean the filter bag.

[0016] To facilitate the installation and removal of the air inlet pipe, a sleeve 4 is provided on the left side wall of the casing. The air inlet pipe 1 is inserted into the sleeve, and screws are screwed on the sleeve wall.

Claims

1. An air filter fan, comprising a housing (5), an impeller (12) disposed within the housing, the impeller having a left cover (6) and a right cover (8), blades (7) connecting the left and right covers, an air inlet pipe (1) inserted into the left side wall of the housing, the air inlet pipe passing through the left cover and extending into the impeller, characterized in that, Multiple strip grooves (3) are evenly distributed on the outer circle of the air inlet pipe extending into the impeller. The spacing between adjacent strip grooves is much smaller than the width of the strip groove. A filter bag (2) is fixedly fitted on the air inlet pipe. The waist of the filter bag covers the strip groove, and the bottom of the filter bag covers the right end of the air inlet pipe.

2. The air filtration fan of claim 1, wherein, The blade (7) is rectangular, and the inner edge of the blade is parallel to the air inlet pipe.

3. The air filtration fan of claim 1 or 2, wherein, The spacing between adjacent slots is 3 mm, and the ratio of the spacing between slots to the width of the slots is 1:8.

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