A composite fresh air filtration device

Abstract

This invention discloses a composite fresh air filtration device, belonging to the technical field of fresh air filtration equipment. The device includes a housing, a fan, and an air blowing module. The housing contains multiple sets of filter chambers connected in series. A dust collection hopper with a dust outlet is connected below each filter chamber, and the dust outlet is equipped with a backflow preventer. The air blowing module has a first air nozzle located above the dust collection hopper. This device guides external air through each filter chamber sequentially via the fan to filter sand and dust. The filtered dust falls into the dust collection hopper for collection, and the air blowing module automatically blows away the accumulated dust. Simultaneously, the backflow preventer effectively prevents external airflow from flowing back into the housing when the fan draws air in, avoiding backflow pollution problems. The device is suitable for extreme working conditions with high sand and dust levels, such as deserts, and can effectively meet the filtration requirements for fresh air cooling in wind turbine nacelles, reducing wind power operation and maintenance costs. The device has extremely high adaptability and practicality.

Description

Technical Field

[0001] This invention relates to the field of fresh air filtration technology, specifically to a composite fresh air filtration device. Background Technology

[0002] With the rapid development of my country's new energy industry, desert, Gobi, and other barren areas have become core sites for wind power generation. These areas are rich in wind energy resources and have huge development potential, making them the core areas for the construction of large-scale wind power bases. However, these areas are plagued by sandstorms year-round, with extremely high dust concentrations and significant temperature differences between day and night. The harsh natural environment poses a great challenge to the stable operation of wind turbine generators. During the operation of wind turbine generators, the core mechanical and electrical components such as generators, gearboxes, and converters inside the nacelle continuously generate a large amount of heat. A fresh air cooling system is needed to introduce external natural air for forced ventilation and heat dissipation to ensure that the equipment operating temperature is within a reasonable range. This prevents problems such as high-temperature overload, accelerated aging, and shutdown failures, and is a key supporting system for the long-term stable operation of wind turbines.

[0003] Currently, wind turbine fresh air cooling systems are generally equipped with traditional fresh air filtration devices to filter the air entering the nacelle, block sand and dust impurities, and protect the internal precision equipment. However, existing filtration devices have many inherent technical defects in high-dust desert conditions, making them unsuitable for long-term operation in extreme sandstorm environments. First, the dust collection structure of traditional filtration devices is simple in design, and sand and dust easily accumulate inside the dust collection structure after filtration. Long-term operation can easily lead to dust accumulation and blockage, directly reducing the fresh air ventilation and filtration efficiency. This results in insufficient heat dissipation in the wind turbine nacelle, triggering high-temperature alarms, reduced capacity operation, or even shutdown failures, significantly increasing wind power operation and maintenance costs and power generation losses.

[0004] Secondly, existing equipment lacks a targeted dust removal and suppression structure. Accumulated sand and dust are easily re-entrained by the fan's suction and airflow disturbance. The fine sand and dust raised can then re-enter the nacelle with the fresh air, adhering to the surfaces of electrical components, wiring, and transmission structures. This causes safety hazards such as equipment wear, reduced insulation performance, and short circuits, severely shortening the service life of wind power generation equipment. Simultaneously, traditional dust collection and exhaust structures lack backflow prevention design. When the fan is operating, outside air can easily flow backward from the exhaust port into the filter, carrying external sand and dust that directly penetrates the filter structure, causing backflow pollution and completely destroying the fresh air filtration effect, creating a vicious cycle of "filtration failure, sand and dust entering the nacelle, and equipment damage."

[0005] In addition, existing wind turbine fresh air filtration devices are mostly integrated high up in the turbine nacelle. This high installation position makes repair, cleaning, and maintenance difficult when blockages or malfunctions occur, requiring specialized high-altitude work. This not only results in low maintenance efficiency but also poses extremely high operational safety risks, making it unsuitable for the large-scale, long-term, and low-maintenance-cost operation requirements of desert wind farms. Existing technologies generally suffer from common problems such as dust accumulation and blockage, secondary dust generation, backflow pollution, and inconvenient maintenance. Their filtration stability and environmental adaptability are poor, failing to meet the long-term, efficient, and stable ventilation and filtration needs of wind turbine fresh air cooling systems in desert environments.

[0006] Therefore, there is an urgent need to develop a composite fresh air filtration device that is adapted to extreme desert sandstorm conditions, can automatically clean dust, prevent backflow pollution, and is easy to operate and maintain, in order to solve many defects of existing technologies, ensure the continuous and efficient operation of the wind turbine fresh air cooling system, improve the operational stability and service life of wind power equipment in harsh environments, and reduce operation and maintenance costs. Summary of the Invention

[0007] To overcome the shortcomings of the prior art, the present invention provides a composite fresh air filtration device to adapt to the fresh air supply after dust removal in outdoor environments.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solution: A composite fresh air filtration device includes: The housing has an air inlet and an air outlet. Inside the housing are several filter chambers connected in sequence. The filter chambers are located between the air inlet and the air outlet. A dust collection hopper is located below the filter chambers. The bottom of the filter chambers has an opening that communicates with the dust collection hopper. The bottom of the dust collection hopper has a dust discharge port, and the dust discharge port is equipped with a check valve. A fan, connected to the filter chambers, is used to draw air in from the inlet, and after passing through each filter chamber, it is discharged through the outlet. The air blowing module includes a first air blowing nozzle located above the dust collection hopper.

[0009] Based on the above device, its working method is as follows: the fan draws air into the housing through the air inlet and then discharges it through the air outlet. After entering the housing, the air passes through each filter chamber in sequence to filter the dust in the air. The dust collection hopper is used to collect the dust falling downwards from the filter chambers. The blowing module uses a first blowing nozzle to blow the dust accumulated in the dust collection hopper out through the dust discharge port. Furthermore, due to the function of the anti-reverse device, it can prevent air from entering the housing from the dust discharge port during the fan's suction process.

[0010] Furthermore, in this application, a composite fresh air filtration device includes a first filter chamber, which is provided with a plurality of dust-blocking components. The inlet and outlet of the first filter chamber are located on both sides of the dust-blocking components. The dust-blocking components include a plurality of dust-blocking plates. The dust collection hopper includes a first dust collection hopper located below the dust-blocking components. The bottom of the first filter chamber is provided with a connection to the first dust collection hopper.

[0011] Furthermore, in a composite fresh air filtration device of this application, dust baffles are arranged in several layers between the inlet and outlet of the first filter chamber, with adjacent layers of dust baffles staggered. As a preferred embodiment of this application, this increases the path length of airflow through the first filter chamber, thereby improving filtration efficiency. Furthermore, in a composite fresh air filtration device of this application, the dust baffles are vertically fixed to the bottom of the housing, with the height of the dust baffle layer closer to the outlet of the first filter chamber being higher, and the height of the outlet of the first filter chamber being lower than the height of the dust baffle layer adjacent to it, to ensure that air can pass through each layer of dust baffles sequentially.

[0012] Furthermore, in a composite fresh air filtration device of this application, the filter chamber includes a second filter chamber, the inlet of which is connected to the outlet of the first filter chamber. The second filter chamber is provided with a filter cartridge, and the exhaust port of the filter cartridge passes through the second filter chamber to communicate with the air outlet. The air blowing module also includes a second air blowing nozzle, which is located outside the second filter chamber and faces the exhaust port of the filter cartridge.

[0013] The second air nozzle is used to blow off the dust adhering to the outer wall of the filter cartridge, thereby extending the service life of the filter cartridge.

[0014] Furthermore, in a composite fresh air filtration device of this application, the filter cartridge is vertically fixed to the top of the second filter chamber, the exhaust port of the filter cartridge passes through the top of the second filter chamber, and the dust collection hopper includes a second dust collection hopper located below the second filter chamber, with the bottom of the second filter chamber connected to the second dust collection hopper.

[0015] Furthermore, in a composite fresh air filtration device of this application, the air inlet is located on the upper side of the side of the housing to prevent water from entering the air inlet due to water accumulation in outdoor working conditions. The outer side of the housing is provided with a rain cover, and the air inlet is located inside the rain cover.

[0016] Furthermore, in one composite fresh air filtration device of this application, a rainproof cover has several air inlets arranged vertically. The rainproof cover includes a baffle positioned above and outside the air inlets, with a rain-guiding slope at the top of the baffle. As a preferred embodiment of this application, air enters the air intake through the air inlets, the baffle is provided to block rain, and the rain-guiding slope is used to guide rainwater.

[0017] Furthermore, a composite fresh air filtration device in this application includes a dust collection hopper comprising a first plate and a second plate, which are V-shaped to prevent dust accumulation on the inner wall of the dust collection hopper. The bottom edge of the second plate is located above the bottom edge of the first plate, and the dust discharge port is located between the bottom edge of the second plate and the side of the first plate. A backflow preventer includes a flexible sealing strip covering the dust discharge port, one end of which is fixed to the second plate, and the other end extends to the outside of the dust discharge port and elastically abuts against the side of the first plate. As a preferred embodiment of this application, a typical backflow preventer is a backflow valve, which often requires connection to a pipeline. This design uses a flexible sealing strip directly covering the dust discharge port, eliminating the need for an additional valve body and connection structure, making installation convenient and responsive. This design achieves unidirectional airflow through the elastic deformation of the flexible sealing strip, effectively preventing dust backflow during shutdown, while significantly reducing maintenance frequency and replacement costs. It has the advantages of simple structure and low manufacturing cost.

[0018] Furthermore, in this application, a composite fresh air filtration device has a dust discharge opening at the bottom of the housing corresponding to the dust discharge port, so as to directly discharge dust downwards and outwards.

[0019] This application discloses a composite fresh air filtration device, which effectively solves common problems in traditional fresh air systems such as dust accumulation and clogging in the dust collection hopper, secondary dust generation, and backflow pollution. Furthermore, it eliminates the need for manual dust removal, significantly improving filtration efficiency and long-term operational stability. It is effectively applicable to outdoor applications such as fresh air cooling systems for wind turbines. When used with wind turbines, the entire filtration device can be positioned at a low location outside the turbine for easy maintenance. Therefore, this composite fresh air filtration device is particularly suitable for desert environments, used to filter air and provide fresh air for cooling the internal components of the mechanical and electrical equipment on the top of wind turbines. Attached Figure Description

[0020] Figure 1 This is a side view of a composite fresh air filtration device according to an embodiment of this application; Figure 2 This is a top view of a composite fresh air filtration device according to an embodiment of this application; Figure 3 This application provides an embodiment of a composite fresh air filtration device. Figure 1 Perspective view from a given angle; Figure 4 This application provides an embodiment of a composite fresh air filtration device. Figure 2 Perspective view from a given angle.

[0021] In the diagram: 1-Box body; 101-Air inlet; 102-Air outlet; 11-Dust hopper; 110-Dust discharge port; 111-First dust hopper; 112-Second dust hopper; 113-First plate; 114-Second plate; 12-First filter chamber; 121-Dust baffle; 13-Second filter chamber; 131-Filter cartridge; 14-Rainproof cover; 141-Air inlet; 142-Eaves; 143-Rain guide slope; 15-Maintenance cover; 2-Fan; 3-Blowing module; 31-First blowing nozzle; 32-Second blowing nozzle; 33-Solenoid pulse valve; 4-Flexible sealing strip. Detailed Implementation Example

[0022] Combination Figures 1 to 4 The composite fresh air filtration device shown includes: The housing 1 has an air inlet 101 and an air outlet 102. The housing 1 has several filter chambers connected in sequence. The filter chambers are located between the air inlet 101 and the air outlet 102. The filter chambers have a dust collection hopper 11 below them. The bottom of the filter chambers has an opening that communicates with the dust collection hopper 11. The bottom of the dust collection hopper 11 has a dust discharge port 110. The dust discharge port 110 has a check valve. Fan 2, which is connected to the filter chamber, is used to draw air in from the air inlet 101, and after passing through each filter chamber, it is discharged through the air outlet 102. The air blowing module 3 includes a first air blowing nozzle 31 located above the dust collection hopper 11.

[0023] Based on the above device, its working method is as follows: the fan 2 draws air into the housing 1 through the air inlet 101 and then discharges it through the air outlet 102. After entering the housing 1, the air passes through each filter chamber in sequence to filter the dust in the air. The dust collection hopper 11 is used to collect the dust falling down from the filter chamber. The blowing module 3 uses the first blowing nozzle 31 to blow the dust accumulated in the dust collection hopper 11 out through the dust discharge port 110. Furthermore, due to the function of the anti-reverse device, it can prevent air from entering the housing 1 from the dust discharge port 110 during the fan 2's suction process.

[0024] Typical check valves require connection to pipelines, but in this embodiment, a combination of... Figure 3As shown, the dust collection hopper 11 includes a first plate 113 and a second plate 114. The first plate 113 and the second plate 114 are arranged in a V-shape to prevent dust accumulation on the inner wall of the dust collection hopper 11. The bottom edge of the second plate 114 is located above the bottom edge of the first plate 113. The dust discharge port 110 is located between the bottom edge of the second plate 114 and the side of the first plate 113. The anti-reverse component includes a flexible sealing strip 4 covering the dust discharge port 110. One end of the flexible sealing strip 4 is fixed to the second plate 114, and the other end extends to the outside of the dust discharge port 110 and elastically abuts against the side of the first plate 113. Therefore, this embodiment uses a flexible sealing strip directly covering the dust discharge port, eliminating the need for additional valve bodies and connecting structures, making installation convenient and responsive. This design achieves unidirectional airflow through the elastic deformation of the flexible sealing strip, effectively preventing dust backflow during shutdown, while significantly reducing maintenance frequency and replacement costs. It has the advantages of simple structure and low manufacturing cost. Specifically, the bottom of the housing 1 is provided with a dust discharge opening below the dust discharge port 110 to discharge dust directly downwards and outwards.

[0025] Specifically, the dust collection hopper 11 is installed on the bottom outer side of the filter chamber. Specifically, the housing 1 is provided with several inspection ports, and inspection covers 15 are detachably installed on the inspection ports.

[0026] Furthermore, in this embodiment, the filter chamber includes a first filter chamber 12, which is provided with a plurality of dust-blocking components. The inlet and outlet of the first filter chamber 12 are located on both sides of the dust-blocking components, and the dust-blocking components include a plurality of dust-blocking plates 121. The dust collection hopper 11 includes a first dust collection hopper 111 located below the dust-blocking components, and the bottom of the first filter chamber 12 is provided with a connection to the first dust collection hopper 111. Specifically, the inlet of the first filter chamber 12 corresponds to the air inlet 101. In addition, as... Figure 4 As shown, the dust baffles 121 are arranged in several layers between the inlet and outlet of the first filter chamber 12, with adjacent layers of dust baffles 121 staggered. This increases the path length of the airflow through the first filter chamber 12, thereby improving filtration efficiency. Specifically, there are three layers of dust baffles 121 between the inlet and outlet of the first filter chamber 12. Furthermore, the dust baffles 121 are vertically fixed to the bottom of the housing 1, with the height of the layer of dust baffles 121 closer to the outlet of the first filter chamber 12 being higher, and the height of the outlet of the first filter chamber 12 being lower than the height of the adjacent layer of dust baffles 121, to ensure that air can pass through each layer of dust baffles 121 sequentially.

[0027] Furthermore, in this embodiment, the filter chamber includes a second filter chamber 13, the inlet of which is connected to the outlet of the first filter chamber 12. A filter cartridge 131 is disposed within the second filter chamber 13, and the exhaust port of the filter cartridge 131 penetrates the second filter chamber 13 to communicate with the air outlet 102. The air blowing module 3 also includes a second air nozzle 32, located outside the second filter chamber 13 and directly facing the exhaust port of the filter cartridge 131. The second air nozzle 32 is used to blow off dust adhering to the outer wall of the filter cartridge 131. Specifically, the air blowing module 3 is connected to the first air nozzle 31 and the second air nozzle 32 via an air compressor, and a PLC-controlled electromagnetic pulse valve 33 is installed on the pipeline to achieve intermittent air blowing dust removal. In this embodiment, the filter cartridge 131 is vertically fixed to the top of the second filter chamber 13, and the exhaust port of the filter cartridge 131 extends through the top of the second filter chamber 13. The dust collection hopper 11 includes a second dust collection hopper 112, which is located below the second filter chamber 13, and the bottom of the second filter chamber 13 is connected to the second dust collection hopper 112. Specifically, the top of the second filter chamber 13 is a plate, and the filter cartridges 131 are installed on this plate. A total of 20 filter cartridges 131 are installed on the plate. Furthermore, in this embodiment, the air inlet 101 is located on the upper side of the side of the housing 1 to prevent water from accumulating outside in outdoor conditions and invading the air inlet 101. A rain cover 14 is provided on the outside of the housing 1, and the air inlet 101 is disposed inside the rain cover 14. Specifically, the rain cover 14 has a plurality of air inlets 141 arranged vertically. The rain cover 14 includes an eaves 142 disposed above the outer side of the air inlets 141, and a rain-guiding slope 143 is provided at the top of the eaves 142. Air enters the air inlet 101 from the air inlets 141. The eaves 142 are provided to block rain, and the rain-guiding slope 143 is provided to guide rainwater.

[0028] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can conceive of other specific embodiments of the invention without creative effort, and these embodiments will all fall within the scope of protection of the present invention.

Claims

1. A composite fresh air filtration device, characterized in that, include: The box (1) is provided with an air inlet (101) and an air outlet (102). The box (1) is provided with a number of filter chambers connected in sequence. The filter chambers are located between the air inlet (101) and the air outlet (102). A dust collection hopper (11) is provided below the filter chamber. The bottom of the filter chamber is provided with an opening that communicates with the dust collection hopper (11). The bottom of the dust collection hopper (11) is provided with a dust discharge port (110). A check valve is provided on the dust discharge port (110). A fan (2) is connected to the filter chambers and is used to draw air in from the inlet (101), and after passing through each filter chamber, it is discharged through the outlet (102); The blowing module (3) includes a first blowing nozzle (31) located above the dust collection hopper (11).

2. The composite fresh air filtration device according to claim 1, characterized in that: The filter chamber includes a first filter chamber (12), which is provided with a number of dust-blocking components. The inlet and outlet of the first filter chamber (12) are located on both sides of the dust-blocking components. The dust-blocking components include a number of dust-blocking plates (121). The dust collection hopper (11) includes a first dust collection hopper (111) located below the dust-blocking components. The bottom of the first filter chamber (12) is provided with a connection to the first dust collection hopper (111).

3. The composite fresh air filtration device according to claim 2, characterized in that: Dust baffles (121) are arranged in several layers between the inlet and outlet of the first filter chamber (12), with adjacent dust baffles (121) arranged in a staggered manner.

4. The composite fresh air filtration device according to claim 3, characterized in that: The dust baffle (121) is vertically fixed to the bottom of the box (1). The height of the dust baffle (121) closer to the outlet of the first filter chamber (12) is higher. The height of the outlet of the first filter chamber (12) is lower than the height of the dust baffle (121) of the adjacent layer.

5. A composite fresh air filtration device according to claim 2, characterized in that: The filter chamber includes a second filter chamber (13), the inlet of which is connected to the outlet of the first filter chamber (12). The second filter chamber (13) is provided with a filter cylinder (131), and the exhaust port of the filter cylinder (131) passes through the second filter chamber (13) to communicate with the air outlet (102). The air blowing module (3) also includes a second air blowing nozzle (32), which is located outside the second filter chamber (13) and faces the exhaust port of the filter cylinder (131).

6. The composite fresh air filtration device according to claim 5, characterized in that: The filter cartridge (131) is vertically fixed to the top of the second filter chamber (13). The exhaust port of the filter cartridge (131) passes through the top of the second filter chamber (13). The dust collection hopper (11) includes a second dust collection hopper (112). The second dust collection hopper (112) is located below the second filter chamber (13). The bottom of the second filter chamber (13) is connected to the second dust collection hopper (112).

7. The composite fresh air filtration device according to claim 1, characterized in that: The air inlet (101) is located on the upper side of the side of the box (1), and a rain cover (14) is provided on the outside of the box (1). The air inlet (101) is located inside the rain cover (14).

8. A composite fresh air filtration device according to claim 7, characterized in that: The rain cover (14) has several air inlets (141) arranged vertically. The rain cover (14) includes a awning (142) located above the outside of the air inlets (141). The top of the awning (142) is provided with a rain-guiding slope (143).

9. A composite fresh air filtration device according to claim 1, characterized in that: The dust collection hopper (11) includes a first plate (113) and a second plate (114). The first plate (113) and the second plate (114) are arranged in a V-shape. The bottom edge of the second plate (114) is located above the bottom edge of the first plate (113). The dust discharge port (110) is located between the bottom edge of the second plate (114) and the side of the first plate (113). The anti-reverse component includes a flexible sealing strip (4) covering the dust outlet (110), one end of which is fixed to the second plate (114), and the other end extends to the outside of the dust outlet (110) and elastically abuts against the side of the first plate (113).

10. A composite fresh air filtration device according to claim 1, characterized in that: The bottom of the box (1) is provided with a dust discharge opening below the dust discharge port (110).

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