An integrated sound attenuation, low pressure drop, high power fuel cell air filter

Abstract

The application discloses a kind of integrated sound attenuation, low pressure drop high-power fuel cell air filter in the field of air filter, comprising: shell, including air filter shell and resonance shell, air filter shell is opened with a gas outlet;First resonance cavity, located in resonance shell, first resonance cavity bottom side is opened with air inlet, and first resonance cavity is internally provided with the resonance structure for noise reduction;Second resonance cavity is also located in resonance shell, and second resonance cavity and first resonance cavity are closed by a partition, and the air passage is opened on the partition, and the air passage is located in the upper portion of the opposite side with air inlet;Filtering cavity, located in air filter shell, and filtering cavity is separated from second resonance cavity by an air filter filter element;The beneficial effects of the application are that: by setting three cavities, resonance structure is set in the first resonance cavity, resonance structure constitutes high-frequency resonance cavity and low-frequency resonance cavity, and the resonance sound attenuation effect is improved;And by controlling air flow rate and reducing the flow resistance of key interface position, the pressure drop in flow process is also reduced.

Description

Technical Field

[0001] This invention relates to the field of air filter technology, specifically to a high-power fuel cell air filter with integrated noise reduction and low pressure drop. Background Technology

[0002] As research into fuel cells deepens, hydrogen-powered locomotives have become a key R&D focus in the rail transit sector. Unlike automobiles, hydrogen-powered locomotives have higher power requirements for fuel cells. Driven by service industry needs, single-unit fuel cell systems of 200kW and above have become a key focus of fuel cell companies' R&D efforts.

[0003] High-power fuel cells currently mostly use cylindrical air filters. However, the thickness of the filter element is limited due to the need for bending, resulting in a large size for high-power fuel cell systems and occupying significant dimensions. Furthermore, cylindrical air filters have poor individual waterproofing performance; to ensure good continuous chemical filtration performance throughout the filter's lifespan, the air filter's intake structure must have excellent waterproofing. To improve its waterproofing, a separate intake structure is often required. In high-power fuel cell systems, with the significant increase in intake air volume and compressor speed, the size of the muffler structure is also increasing, making muffler placement a challenge in system design. In fuel cell systems, compressor energy consumption often accounts for more than 10% of system efficiency; reducing intake energy loss (i.e., low pressure drop) has gradually become a key focus of fuel cell intake system design research.

[0004] To address this, we propose a high-power fuel cell air filter that integrates noise reduction and low pressure drop. Summary of the Invention

[0005] To address the aforementioned shortcomings of existing technologies, this invention provides a high-power fuel cell air filter that integrates noise reduction and low pressure drop.

[0006] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0007] A high-power fuel cell air filter with integrated noise reduction and low pressure drop includes: a shell, comprising an air filter housing and a resonant housing, the air filter housing and the resonant housing being connected to each other to form a cavity, and an air outlet being provided on the air filter housing; a first resonant cavity, located inside the resonant housing, with an air inlet being provided on the bottom surface of the resonant housing on one side of the bottom of the first resonant cavity, and a resonant structure for noise reduction being provided inside the first resonant cavity; a second resonant cavity, also located inside the resonant housing, the second resonant cavity and the first resonant cavity being sealed by a partition, with an air vent connecting the first resonant cavity and the second resonant cavity being provided on the partition, the air vent being located on the upper part of the side opposite to the air inlet; and a filter cavity, located inside the air filter housing, the filter cavity being separated from the second resonant cavity by an air filter element.

[0008] The traditional dual-chamber air filter structure has been improved into a three-chamber structure, with a resonant structure set in the first resonant chamber. Noise enters the filter chamber from the outlet, then passes through the air filter element and the second resonant chamber's vent, entering the first resonant chamber, forming an expanded 1 / 4 wavelength resonant chamber. Furthermore, the inlet and outlet are positioned in different locations, maximizing their distance. The resonant structure along this path enhances noise reduction performance, resulting in excellent noise reduction. Additionally, energy loss is reduced by controlling the gas flow rate and flow resistance at key interfaces, leading to a lower pressure drop during the intake-to-exhaust process. Positioning the inlet at the bottom effectively prevents rainwater from entering the casing, improving waterproofing. The overall size is also smaller than that of a cylindrical air filter, making it easier to install.

[0009] Further defined, the resonant structure includes a first resonant horizontal bar, a second resonant horizontal bar, a third resonant horizontal bar, several supporting vertical plates, several horizontal plates, and a resonant top plate; the first and second resonant horizontal bars are vertically spaced on the side wall of the resonant housing on the side where the air inlet is located, several supporting vertical plates are horizontally spaced on the bottom surface of the resonant housing, several horizontal plates are located between adjacent supporting vertical plates, and the resonant top plate is horizontally located on top of several supporting vertical plates. The head of the resonant top plate extends beyond the supporting vertical plate on the side of the air inlet, the tail bends downward at an inclination and then bends upward to connect with the side wall of the resonant housing, and the third resonant horizontal bar is located on the supporting vertical plate on the side of the air inlet; several small resonant holes are arranged in a matrix on the resonant top plate, and the front and rear ends of the first resonant horizontal bar, the second resonant horizontal bar, the third resonant horizontal bar, the supporting vertical plates, the horizontal plates, and the resonant top plate are all connected to the front end face and the partition plate of the resonant housing.

[0010] A mid-to-high frequency resonant cavity is formed by the first, second, and third resonant horizontal bars and the resonant top plate extending from the outermost supporting vertical plate. A low-frequency resonant cavity is formed by the resonant top plate, supporting vertical plate, and horizontal plate. Multiple sets of Helmholtz resonant cavities are formed by multiple supporting vertical plates and horizontal plates to achieve low-frequency resonance coupling, thereby improving the resonance noise reduction effect. Through the high-frequency resonant cavity and multiple sets of low-frequency resonant cavities, the noise reduction frequency range can be wider and the noise reduction effect can be better.

[0011] Further, a ash discharge port is provided on the bottom surface of the resonant housing opposite to the air inlet. The ash discharge port is located at the bottom of the first resonant cavity and is sealed with a plug. By providing a ash discharge port on the bottom surface of the resonant housing and placing it below the inclined section of the resonant top plate, it is easier to collect and discharge the falling ash.

[0012] Furthermore, the air inlet is equipped with a funnel-shaped air intake nozzle, and an air intake filter is installed at the opening of the air intake nozzle; the air intake nozzle can concentrate the air intake, and the air intake filter installed inside the air intake nozzle can pre-filter and block coarse dust particles in the air, preventing them from entering the housing and causing damage to the housing.

[0013] Further, the vent is shaped like a right-angled trapezoid, with the hypotenuse of the vent parallel to the inclined section at the tail of the resonant top plate; this vent configuration increases the ventilation volume and better matches the resonant cavity.

[0014] Furthermore, a pre-filter layer is provided on the surface of the air filter element on one side of the second resonant cavity; the pre-filter layer on the surface of the air filter element can further prevent water from contacting the chemical filter layer, and filter relatively large dust particles, thereby improving service life and ensuring filtration effect.

[0015] Furthermore, the height of several horizontal plates is set to decrease sequentially from the air inlet side to the ash outlet side; this setting makes the multiple Helmholtz resonant cavities gradually increase from the air inlet side to the ash outlet side, which can improve the resonance silencing effect.

[0016] Furthermore, the air outlet is located on the same side of the air filter housing as the air inlet; this arrangement of the air outlet maximizes the noise transmission distance and allows for a change in direction, enabling the resonant cavity to eliminate the most frequencies and further enhancing the noise reduction effect.

[0017] Further, an air outlet is connected to an air outlet pipe, and there is a rounded corner between the air outlet pipe and the air filter housing. A flow equalization plate is embedded in the air filter housing at the position corresponding to the air outlet. The rounded corner between the air outlet pipe and the air filter housing can reduce the pressure drop of the air at this point, thereby reducing energy loss.

[0018] The beneficial effects of the present invention are as follows: by setting three cavities, a resonant structure is set in the first resonant cavity, and the resonant structure constitutes a high-frequency resonant cavity and a low-frequency resonant cavity, thereby improving the resonance noise reduction effect; and by controlling the air flow rate and reducing the flow resistance at key interface positions, the pressure drop during the flow process is also reduced. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a side view of the present invention;

[0021] Figure 3 This is an exploded view of the resonant housing and resonant structure;

[0022] Figure 4 This is an exploded view of the present invention;

[0023] Figure 5 This is an exploded view of the air filter housing;

[0024] Figure 6 This is a comparison diagram of the effects of the present invention and the prior art;

[0025] The symbols for each component are as follows:

[0026] Outer shell 1, air filter housing 11, air outlet 111, air outlet pipe 112, flow equalization plate 113, resonant housing 12, air inlet 121, air inlet nozzle 122, ash discharge port 123, first resonant cavity 2, second resonant cavity 3, filter cavity 4, resonant structure 5, first resonant horizontal bar 51, second resonant horizontal bar 52, third resonant horizontal bar 53, support vertical plate 54, horizontal plate 55, resonant top plate 56, resonant hole 561, partition plate 6, air vent 61, air filter element 7, pre-filter layer 71. Detailed Implementation

[0027] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0028] Example:

[0029] like Figures 1-5As shown, a high-power fuel cell air filter with integrated noise reduction and low pressure drop includes a housing 1, a first resonant cavity 2, a second resonant cavity 3, and a filter cavity 4. The housing 1 includes an air filter housing 11 and a resonant housing 12, which are connected to each other to form a cavity. An air outlet 111 is provided on the air filter housing 11. The first resonant cavity 2 is located inside the resonant housing 12. An air inlet 121 is provided on the bottom surface of the resonant housing 12 on one side of the bottom of the first resonant cavity 2. An air inlet 122 with a flared mouth-shaped air inlet nozzle 122 is provided on the opening of the air inlet nozzle 122. An air inlet filter screen is provided at the opening of the air inlet nozzle 122. A resonant structure 5 for noise reduction is provided inside the first resonant cavity 2. The bottom surface of the resonant housing 12 on the side opposite to the air inlet 121 is... A ash discharge port 123 is provided at the top, located at the bottom of the first resonant cavity 2, and sealed with a plug. The resonant structure 5 includes a first resonant horizontal bar 51, a second resonant horizontal bar 52, a third resonant horizontal bar 53, several supporting vertical plates 54, several horizontal plates 55, and a resonant top plate 56. The first and second resonant horizontal bars 51 and 52 are vertically spaced on the side wall of the resonant housing 12 on the side where the air inlet 121 is located. Several supporting vertical plates 54 are horizontally spaced on the bottom surface of the resonant housing 12. Several horizontal plates 55 are arranged between adjacent supporting vertical plates 54, and the height of the horizontal plates 55 decreases sequentially from the air inlet 121 side to the ash discharge port 123 side. The resonant top plate 56 is horizontally arranged on the side wall of the resonant housing 12. At the top of plate 54, the head of the resonant top plate 56 extends beyond the supporting vertical plate 54 on the side of the air inlet 121, and the tail bends downward at an incline before bending upward to a horizontal position to connect with the side wall of the resonant housing 12. The third resonant horizontal bar 53 is located on the supporting vertical plate 54 on the side of the air inlet 121. Several small resonant holes 561 are arranged in a matrix on the resonant top plate 56. The front and rear ends of the first resonant horizontal bar 51, the second resonant horizontal bar 52, the third resonant horizontal bar 53, the supporting vertical plate 54, the horizontal plate 55, and the resonant top plate 56 are all connected to the front end face of the resonant housing 12 and the partition plate 6. The second resonant cavity 3 is also located inside the resonant housing 12. The second resonant cavity 3 and the first resonant cavity 2 are sealed by a partition plate 6. A connecting hole is opened on the partition plate 6. The resonant cavity 2 and the second resonant cavity 3 have vents 61, which are located on the upper part of the side opposite to the air inlet 121. The vent 61 is in the shape of a right trapezoid, and the hypotenuse of the vent 61 is parallel to the inclined section of the tail of the resonant top plate 56. The filter cavity 4 is located inside the air filter housing 11 and is separated from the second resonant cavity 3 by an air filter element 7. The surface of the air filter element 7 on one side of the second resonant cavity 3 is also provided with a pre-filter layer 71. The air outlet 111 is opened on the air filter housing 11 on the same side as the air inlet 121. An air outlet pipe 112 is connected to the air outlet 111. The air outlet pipe 112 and the air filter housing 11 have rounded corners. A flow equalization plate 113 is embedded in the air filter housing 11 at the position corresponding to the air outlet 111.

[0030] The traditional dual-chamber air filter structure is improved into a three-chamber structure, and a resonant structure 5 is set in the first resonant cavity 2. Noise enters the filter cavity 4 from the outlet 111, then passes through the air filter element 7 and the second resonant cavity 3 vent 61 before entering the first resonant cavity 2, forming an expanded 1 / 4 wavelength resonant cavity. Furthermore, the inlet 121 and vent 61 are positioned in different locations, maximizing the distance between them. The resonant structure 5 is designed along this path to enhance the noise reduction performance, thus achieving good noise reduction. Additionally, energy loss is reduced by controlling the gas flow rate and flow resistance at key interface locations, thereby improving the efficiency of the intake. The pressure drop during the exhaust process is lower; and placing the air inlet 121 at the bottom effectively prevents rainwater from entering the housing 1, improving waterproof performance. It is also smaller in size than a barrel-shaped air filter, making it easier to install and arrange. A high-frequency resonant cavity is formed by the first resonant horizontal bar 51, the second resonant horizontal bar 52, the third resonant horizontal bar 53, and the resonant top plate 56 extending from the outermost supporting vertical plate 54. A low-frequency resonant cavity is formed by the resonant top plate 56, the supporting vertical plate 54, and the horizontal plate 55. Multiple The vertical plate 54 and horizontal plate 55 form multiple sets of Helmholtz resonant cavities to achieve low-frequency resonance coupling, improving the resonance noise reduction effect. Through the high-frequency resonant cavity and multiple sets of low-frequency resonant cavities, the noise reduction frequency range is wider, and the noise reduction effect is better. A row of ash outlets 123 is provided on the bottom surface of the resonant housing 12, and the ash outlets 123 are located below the inclined section of the resonant top plate 56, making it easier to collect and discharge fallen ash. An air inlet 122 allows for concentrated air intake, and an air filter is installed inside the air inlet 122 to pre-filter and block coarse dust particles in the air, preventing them from entering the housing and causing damage. This arrangement of the vent 61 allows for… The increased airflow and better matching with the resonant cavity; the pre-filter layer 71 on the surface of the air filter element 7 further prevents water from contacting the chemical filter layer and filters relatively large dust particles, improving service life and ensuring filtration effect; this arrangement makes the multiple sets of Helmholtz resonant cavities gradually increase in size from the air inlet 121 side to the dust outlet 123 side, which can improve the resonance silencing effect; the air outlet 111 is arranged in this way to maximize the noise transmission distance and have a turning direction, so that the resonant cavity can eliminate the most frequencies, further improving the silencing effect; the rounded corner between the air outlet pipe 112 and the air filter housing 11 can reduce the air pressure drop at this point, thereby reducing energy loss.

[0031] like Figure 6 As shown, Figure 6 This diagram illustrates the resonance noise reduction capabilities of existing two-cavity air filter systems, three-cavity air filter systems, and the present invention. Figure 6 The design structure described above is the structure of this invention.

Claims

1. An integrated sound attenuating, low pressure drop, high power fuel cell air filter, characterized by, include: The outer casing (1) includes an air filter housing (11) and a resonant housing (12). The air filter housing (11) and the resonant housing (12) are connected to each other to form a cavity. An air outlet (111) is provided on the air filter housing (11). The first resonant cavity (2) is located inside the resonant housing (12). An air inlet (121) is provided on the bottom surface of the resonant housing (12) on one side of the bottom of the first resonant cavity (2). A resonant structure (5) for noise reduction is provided inside the first resonant cavity (2). The second resonant cavity (3) is also located inside the resonant housing (12). The second resonant cavity (3) and the first resonant cavity (2) are sealed by a partition (6). A vent (61) is opened on the partition (6) to connect the first resonant cavity (2) and the second resonant cavity (3). The vent (61) is located on the upper part of the side opposite to the air inlet (121). The filter chamber (4) is located inside the air filter housing (11), and the filter chamber (4) is separated from the second resonant cavity (3) by an air filter element (7); The resonant structure (5) includes a first resonant horizontal bar (51), a second resonant horizontal bar (52), a third resonant horizontal bar (53), several supporting vertical plates (54), several horizontal plates (55), and a resonant top plate (56). The first resonant horizontal bar (51) and the second resonant horizontal bar (52) are vertically spaced on the side wall of the resonant housing (12) on the side where the air inlet (121) is located. A plurality of supporting vertical plates (54) are horizontally spaced on the bottom surface of the resonant housing (12). A plurality of horizontal plates (55) are disposed between adjacent supporting vertical plates (54). The resonant top plate (56) is horizontally disposed on the top of the plurality of supporting vertical plates (54). The head of the resonant top plate (56) extends beyond the supporting vertical plate (54) on the side of the air inlet (121), and the tail bends downward at an inclination and then bends upward to a horizontal position to connect with the side wall of the resonant housing (12). The third resonant horizontal bar (53) is disposed on the supporting vertical plate (54) on the side of the air inlet (121). The resonant top plate (56) has several small resonant holes (561) arranged in a matrix. The front and rear ends of the first resonant horizontal bar (51), the second resonant horizontal bar (52), the third resonant horizontal bar (53), the supporting vertical plate (54), the horizontal plate (55) and the resonant top plate (56) are all connected to the front end face of the resonant shell (12) and the partition plate (6).

2. The integrated sound attenuating, low pressure drop, high power fuel cell air filter of claim 1, wherein, A ash discharge port (123) is provided on the bottom surface of the resonant housing (12) opposite to the air inlet (121). The ash discharge port (123) is located at the bottom of the first resonant cavity (2), and the ash discharge port (123) is sealed by a plug.

3. The integrated sound attenuating, low pressure drop, high power fuel cell air filter of any of claims 1-2, wherein, The air inlet (121) is provided with a funnel-shaped air inlet nozzle (122), and an air inlet filter is provided at the opening of the air inlet nozzle (122).

4. The high-power fuel cell air filter with integrated noise reduction and low pressure drop as described in claim 1, characterized in that, The vent (61) is in the shape of a right trapezoid, and the hypotenuse of the vent (61) is parallel to the inclined section at the tail of the resonant top plate (56).

5. The high-power fuel cell air filter with integrated noise reduction and low pressure drop according to claim 1, characterized in that, A pre-filter layer (71) is also provided on the surface of the air filter element (7) on one side of the second resonant cavity (3).

6. The high-power fuel cell air filter with integrated noise reduction and low pressure drop according to claim 2, characterized in that, The height of several of the horizontal plates (55) is set to decrease sequentially from the air inlet (121) side to the ash discharge port (123) side.

7. The high-power fuel cell air filter with integrated noise reduction and low pressure drop according to claim 1, characterized in that, The air outlet (111) is located on the air filter housing (11) on the same side as the air inlet (121).

8. The high-power fuel cell air filter with integrated noise reduction and low pressure drop according to claim 7, characterized in that, An air outlet (111) is connected to an air outlet pipe (112), and there is a rounded corner between the air outlet pipe (112) and the air filter housing (11). A flow equalization plate (113) is embedded in the air filter housing (11) at a position corresponding to the air outlet (111).

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