Dustproof induced draft fan

Abstract

The dustproof induced draft fan comprises an induced draft fan body and a filter screen box, the filter screen box is provided with a movable cavity, a filter screen assembly and a driving mechanism are arranged in the movable cavity, the filter screen assembly is provided with a plurality of filter screens arranged at intervals, and the driving mechanism is connected with the filter screen assembly for matched driving. The edges of the filter screens are attached to the inner wall of the movable cavity, the side face of the filter screen box is further provided with an air inlet and an air outlet which are communicated with the movable cavity, the interval direction of the air inlet and the air outlet is matched with the arrangement direction of the filter screens, and the air outlet is connected with the induced draft fan body to supply air. The filter screen with the surface covered with dust is moved to the other side of the air inlet through the driving mechanism, the adjacent filter screen moves to be aligned with the air inlet, the filter screen with little dust in the middle is used for filtering again, the service life of the filter screen assembly is prolonged, the filter screen assembly is not prone to being blocked by dust, the air inflow is not reduced, and the efficient dust filtering effect is kept.

Description

Technical Field

[0001] The invention relates to the technical field of induced draft fans, and in particular to a dust-proof induced draft fan. Background Art

[0002] Induced draft fans are widely used for ventilation and air induction of boilers and industrial furnaces. Existing induced draft fans are equipped with double-layer filters at the air inlet to reduce dust when inhaling air and avoid affecting the garbage treatment of the incinerator; but when the outer filter is covered with dust, it is inconvenient to replace the filter, which affects air circulation, resulting in reduced air intake of the induced draft fan, and the inner filter cannot fully play the dust filtering effect, causing internal damage to the induced draft fan. Therefore, designing a dust-proof induced draft fan that can quickly remove the dust-filled filter and make the remaining filter effective has become a technical problem that needs to be solved urgently. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a dust-proof induced draft fan.

[0004] The technical solution of the utility model is a dust-proof induced draft fan, comprising an induced draft fan body and a filter box, the filter box is provided with an active cavity, a filter assembly and a driving mechanism are provided in the active cavity, the filter assembly is provided with a plurality of filter screens arranged at intervals, the driving mechanism is connected to the filter assembly for cooperative driving, the edge of the filter screen is in contact with the inner wall of the active cavity, the side of the filter box is also provided with an air inlet and an air outlet connected to the active cavity, the spacing direction of the air inlet and the air outlet matches the arrangement direction of the filter screen, and the air outlet is connected to the induced draft fan body for air supply.

[0005] After adopting the above structure, the spacing direction of the air inlet and the air outlet is matched with the arrangement direction of the filter screens, so that the air inlet and the air outlet can be aligned with the spacing between different filter screens. After the induced draft fan body is started, the air flows into the active cavity from the air inlet, and passes through the multiple filter screens between the air inlet and the air outlet to filter the dust in the air, and then flows into the induced draft fan body from the air outlet; by starting the driving mechanism at a fixed time, the filter screen assembly is moved, and the edge of the filter screen is fitted with the inner wall of the active cavity to prevent the filter screen assembly from swinging and causing blockage, and the filter screen with a surface covered with dust is moved to the other side of the air inlet, and the adjacent filter screens are moved to align with the air inlet, and the filter screen with less dust accumulation in the middle is used for filtering again, thereby extending the service life of the filter screen assembly, and the filter screen assembly is not easily blocked by dust, resulting in a reduction in air intake, thereby maintaining an efficient dust filtering effect.

[0006] As a further improvement of the utility model, the driving mechanism includes a connected driving cylinder and a telescopic rod, the telescopic rod is connected to the filter assembly, and the telescopic direction of the telescopic rod matches the arrangement direction of the filter.

[0007] After adopting the above structure, the telescopic direction of the telescopic rod is matched with the arrangement direction of the filter screen, so that the driving mechanism can pull the filter screen assembly more smoothly.

[0008] As a further improvement of the utility model, the air inlet and the air outlet are respectively arranged on two symmetrical sides of the filter box.

[0009] After adopting the above structure, the contact surface between the air and the filter screen is increased during air flow, and the filter screen is fully utilized to filter dust.

[0010] As a further improvement of the utility model, a support spring is sleeved on the outer side of the telescopic rod, and the end of the support spring is connected to the side wall of the movable cavity.

[0011] After adopting the above structure, when the filter assembly moves toward the edge of the movable cavity, the support spring is squeezed to generate elastic force, and the spring elastic force provides a reaction force to improve the stability of the filter assembly during movement.

[0012] As a further improvement of the utility model, a sealing layer is provided on the edge of the filter screen, and a wear-resistant layer is provided on the outer side of the sealing layer.

[0013] After adopting the above structure, when the filter assembly moves, the sealing layer fits against the inner wall of the active cavity to prevent dust from passing through the filter and improve the dust filtering effect; the wear-resistant layer can reduce the loss caused by the sealing layer rubbing against the active cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Shown is a schematic diagram of the structure of the utility model.

[0015] Figure 2 Shown is a schematic diagram of the cross-sectional structure of the filter box.

[0016] 1- induced draft fan body, 2- filter box, 3- movable chamber, 4- filter assembly, 5- air inlet, 6- air outlet, 7- driving cylinder, 8- telescopic rod, 9- supporting spring. DETAILED DESCRIPTION

[0017] like Figure 1-Figure 2 A dust-proof induced draft fan is shown, comprising an induced draft fan body 1 and a filter box 2, the filter box 2 is provided with an active cavity 3, a filter assembly 4 and a driving mechanism are provided in the active cavity 3, the filter assembly 4 is provided with a plurality of filter screens arranged at intervals, the driving mechanism is connected to the filter assembly 4 for cooperative driving, the edge of the filter screen is in contact with the inner wall of the active cavity 3, the side of the filter box 2 is also provided with an air inlet 5 and an air outlet 6 connected to the active cavity 3, the spacing direction of the air inlet 5 and the air outlet 6 matches the arrangement direction of the filter screen, and the air outlet 6 is connected to the induced draft fan body 1 for air supply.

[0018] By matching the spacing direction of the air inlet 5 and the air outlet 6 with the arrangement direction of the filter screens, the air inlet 5 and the air outlet 6 can be aligned with the spacing between different filter screens. After the induced draft fan body 1 is started, the air flows into the active cavity 3 from the air inlet 5, passes through the multiple filter screens between the air inlet 5 and the air outlet 6, filters the dust in the air, and flows into the induced draft fan body 1 from the air outlet 6; by timing the start of the driving mechanism, the filter assembly 4 is moved, and the edge of the filter screen is fitted with the inner wall of the active cavity 3 to prevent the filter assembly 4 from swinging and causing blockage, and the filter screen with a surface covered with dust is moved to the other side of the air inlet 5, and the adjacent filter screens are moved and aligned with the air inlet 5, and the filter screen with less dust accumulation in the middle is used for filtering again, thereby extending the service life of the filter assembly 4. The filter assembly 4 is not easily blocked by dust, resulting in a reduction in air intake, and a high-efficiency dust filtering effect is maintained.

[0019] The driving mechanism comprises a connected driving cylinder 7 and a telescopic rod 8, wherein the telescopic rod 8 is connected to the filter assembly 4, and the telescopic direction of the telescopic rod 8 matches the arrangement direction of the filter.

[0020] By matching the telescopic direction of the telescopic rod 8 with the arrangement direction of the filter screen, the driving mechanism can pull the filter screen assembly 4 more smoothly.

[0021] The air inlet 5 and the air outlet 6 are respectively arranged on two symmetrical sides of the filter box 2 .

[0022] Increase the contact area between air and the filter during flow, and make full use of the filter to filter out dust.

[0023] A support spring 9 is sleeved on the outer side of the telescopic rod 8 , and the end of the support spring 9 is connected to the side wall of the active chamber 3 .

[0024] When the filter assembly 4 moves toward the edge of the active chamber 3 , the support spring 9 is squeezed to generate elastic force, and the spring elastic force provides a reaction force to improve the stability of the filter assembly 4 during the movement.

[0025] A sealing layer is arranged at the edge of the filter screen, and a wear-resistant layer is arranged at the outer side of the sealing layer.

[0026] When the filter assembly 4 moves, the sealing layer fits against the inner wall of the active cavity 3 to prevent dust from passing through the filter, thereby improving the dust filtering effect; the wear-resistant layer can reduce the loss caused by the friction of the sealing layer with the active cavity 3.

Claims

1. A dust-proof induced draft fan, comprising an induced draft fan body (1) and a filter box (2), characterized in that: The filter box (2) is provided with an active cavity (3), a filter assembly (4) and a driving mechanism are provided in the active cavity (3), the filter assembly (4) is provided with a plurality of filter screens arranged at intervals, the driving mechanism is connected to the filter assembly (4) for cooperative driving, the edge of the filter screen is in contact with the inner wall of the active cavity (3), the side of the filter box (2) is also provided with an air inlet (5) and an air outlet (6) connected to the active cavity (3), the spacing direction of the air inlet (5) and the air outlet (6) matches the arrangement direction of the filter screens, and the air outlet (6) is connected to the induced draft fan body (1) for air supply.

2. The dust-proof induced draft fan according to claim 1, characterized in that: The driving mechanism comprises a connected driving cylinder (7) and a telescopic rod (8), wherein the telescopic rod (8) is connected to the filter screen assembly (4), and the telescopic direction of the telescopic rod (8) matches the arrangement direction of the filter screen.

3. The dust-proof induced draft fan according to claim 1, characterized in that: The air inlet (5) and the air outlet (6) are respectively arranged on two symmetrical sides of the filter box (2).

4. The dust-proof induced draft fan according to claim 2, characterized in that: A support spring (9) is sleeved on the outer side of the telescopic rod (8), and the end of the support spring (9) is connected to the side wall of the movable chamber (3).

5. The dust-proof induced draft fan according to claim 1, characterized in that: A sealing layer is arranged at the edge of the filter screen, and a wear-resistant layer is arranged at the outer side of the sealing layer.

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