Filtering device

Abstract

This invention belongs to the field of gas purification technology and discloses a filtration device. The filtration device includes a shell, an adsorption unit, and a filter element unit. The shell has a first end and a second end. The first end has an air inlet channel and an air outlet channel. The adsorption unit is disposed inside the shell and has an air inlet face facing the air inlet channel. The adsorption unit adsorbs impurities in the gas and has a flow chamber. The filter element unit is inserted into the flow chamber and filters dust from the gas. The filter element unit has an air outlet port connected to the air outlet channel. A settling space exists between the inner walls of the adsorption unit and the second end, and this settling space is connected to the flow chamber. This filtration device integrates the adsorption unit and the filter element unit, resulting in a compact structure and small footprint. Furthermore, this filtration device has a strong ability to collect and settle particulate matter such as dust, enhancing the gas purification effect.

Description

Technical Field

[0001] This invention relates to the field of gas purification technology, and more particularly to a filtration device. Background Technology

[0002] With the promotion and popularization of clean and renewable energy, hydrogen fuel cells are being vigorously promoted as one of the key technologies for the global new energy transformation due to their high efficiency, cleanliness, and applicability to multiple scenarios. However, since hydrogen transportation has not yet formed a large-scale and standardized industry, hydrogen may be contaminated by equipment such as pipelines, containers, valves, and compressors during storage and transportation, resulting in the hydrogen purity entering the fuel cell not meeting the requirements.

[0003] To address these issues, manufacturers typically use filters to purify the transported hydrogen to obtain sufficiently pure hydrogen. However, existing gas filtration devices usually have filters and adsors connected in series in two separate containers, resulting in a large volume and complex structure. This causes significant inconvenience for assembly and subsequent maintenance, making them less practical. Summary of the Invention

[0004] The purpose of this invention is to provide a filtration device that can adsorb and filter pollutants in gas, with a compact structure, small footprint, and strong practicality.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Filtering device, including:

[0007] The outer casing has a first end and a second end, wherein an air inlet channel and an air outlet channel are provided on the first end;

[0008] An adsorption unit is disposed inside the housing and located between the first end and the second end. The adsorption unit has an air inlet end face, which is disposed directly opposite the air inlet channel. The adsorption unit is used to adsorb impurities in the gas and has a flow chamber.

[0009] A filter element unit is inserted into the flow chamber. The filter element unit is used to filter dust in the gas. The filter element unit has an air outlet port, which is connected to the air outlet channel.

[0010] There is a settling space between the adsorption unit and the inner wall of the second end. The settling space is connected to the flow cavity. The air inlet channel, the adsorption unit, the settling space, the flow cavity, the filter element unit, and the air outlet channel constitute the gas flow path.

[0011] Preferably, along the gas flow direction, the settling space is provided with multiple annular ribs at intervals, and a settling groove is formed between two adjacent annular ribs.

[0012] Preferably, the depth of the settling tank gradually increases.

[0013] Preferably, the side of the annular rib facing away from the airflow is provided with a slope.

[0014] Preferably, a spacer cavity is formed between the filter element unit and the adsorption unit, and the spacer cavity is in communication with the settling space.

[0015] Preferably, the adsorption unit includes a support plate and an adsorbent. The support plate is connected to the inner wall of the outer shell, and the adsorbent is fixedly disposed on the support plate. The support plate and the inner wall of the outer shell enclose the settling space.

[0016] The support plate has a first group of holes and a second group of holes. Both the first group of holes and the second group of holes include multiple through holes. Along the gas flow direction, the first group of holes is positioned directly opposite the adsorbent. The settling space is connected to the spacer cavity through the second group of holes.

[0017] Preferably, the air intake channel includes an air inlet and a uniformly distributed flow channel connected together. The uniformly distributed flow channel is arranged in a ring shape, and its cross-sectional area gradually decreases along the gas flow direction.

[0018] Preferably, the outer shell is provided with a pressure relief hole, and a valve is provided in the pressure relief hole, through which the settling space is connected to the outside.

[0019] Preferably, the outer casing includes a cylindrical body and a bottom cover plate, wherein the end of the cylindrical body away from the bottom cover plate is the first end, and the bottom cover plate is the second end;

[0020] The cylinder has an installation port, the bottom cover plate is detachably connected to the installation port, and the pressure relief hole is opened in the bottom cover plate.

[0021] Preferably, a mounting base is provided on the inner wall of the first end, the mounting base having a connecting hole that communicates with the air outlet channel;

[0022] The filter element unit is threaded to the connecting hole, and the air outlet port is connected to the air outlet channel through the connecting hole.

[0023] The beneficial effects of this invention are as follows:

[0024] The filtration device provided by this invention includes a housing, an adsorption unit, and a filter element unit. The adsorption unit is disposed inside the housing. Since the air inlet end face of the adsorption unit is directly opposite the air inlet channel of the housing, the gas entering the housing through the air inlet channel will pass through the adsorption unit and be adsorbed by the adsorption unit to remove moisture, organic matter, and other impurities from the gas. The adsorption unit has a flow chamber. Since the filter element unit is disposed in the flow chamber, the gas flowing through the adsorption unit will enter the flow chamber and be filtered by the filter element unit in the flow chamber to remove dust from the gas. Since both the air inlet channel and the air outlet channel are disposed at the first end of the housing, and there is a settling space between the inner walls of the adsorption unit and the second end, after the gas enters the housing through the air inlet channel, it will flow through the adsorption unit and flow towards the second end. When the gas flows to the settling space... After descending into the settling space, the gas flow direction reverses, flowing through the filter element unit towards the first end, and finally exiting through the outlet port and outlet channel, thus achieving the purification operation of gas adsorption followed by filtration. Because the gas flows through the settling space and reverses its flow direction while flowing inside the casing, dust, debris, and other particulate matter in the gas are captured in the settling space under the action of inertial collision and gravitational settling, greatly improving the purification effect of the filtration device. The adsorption unit and filter element unit of this filtration device are integrated into the same casing, enabling the gas to undergo adsorption followed by filtration purification without the need for a series structure consisting of two independent filters and adsorbers. The structure is compact and occupies little space. At the same time, this filtration device has a strong settling and capture capacity for dust and other particulate matter, resulting in strong filtration capacity and good purification effect. Attached Figure Description

[0025] Figure 1 This is an isometric view of the filtration device provided in a specific embodiment of the present invention;

[0026] Figure 2 This is a cross-sectional view of the filtration device provided in a specific embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the internal structure of the outer shell provided in a specific embodiment of the present invention;

[0028] Figure 4 This is an exploded view of the adsorption unit provided in a specific embodiment of the present invention.

[0029] In the picture:

[0030] 1-Outer shell; 11-Inlet channel; 111-Inlet port; 112-Evenly distributed flow channel; 12-Outlet channel; 13-Cylinder body; 14-Bottom cover plate; 141-Annular rib; 142-Settling groove; 143-Pressure relief hole; 15-Mounting base; 151-Connecting hole;

[0031] 2-Adsorption unit; 21-Supporting perforated plate; 211-First pore group; 212-Second pore group; 22-Adsorbent; 23-First support;

[0032] 3-Filter element unit; 31-Filter element body; 32-Connector; 33-Second support; 34-Base;

[0033] 4-Settlement space;

[0034] 5-septal cavity;

[0035] 6-First sealing ring;

[0036] 7-Second sealing ring. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0038] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0041] like Figure 1 and Figure 2As shown, the present invention provides a filtration device, which includes a housing 1, an adsorption unit 2, and a filter element unit 3. The housing 1 has a first end and a second end, and an air inlet channel 11 and an air outlet channel 12 are provided on the first end. The adsorption unit 2 is disposed inside the housing 1 and located between the first end and the second end. The adsorption unit 2 has an air inlet end face, which is positioned directly opposite the air inlet channel 11. The adsorption unit 2 is used to adsorb impurities in the gas and has a flow chamber. The filter element unit 3 is inserted into the flow chamber and is used to filter dust in the gas. The filter element unit 3 has an air outlet port, which is connected to the air outlet channel 12. A settling space 4 is provided between the inner walls of the adsorption unit 2 and the second end, and the settling space 4 is connected to the flow chamber. The air inlet channel 11, the adsorption unit 2, the settling space 4, the flow chamber, the filter element unit 3, and the air outlet channel 12 constitute the gas flow path. Specifically, since the air inlet face of the adsorption unit 2 is directly opposite the air inlet channel 11 of the outer shell 1, the gas entering the outer shell 1 through the air inlet channel 11 will pass through the adsorption unit 2 and be adsorbed by the adsorption unit 2 to remove moisture, organic matter, and other impurities from the gas. The adsorption unit 2 has a flow chamber, in which a filter element 3 is installed. The gas flowing through the adsorption unit 2 will enter the flow chamber and be filtered by the filter element 3 to remove dust from the gas. Since both the air inlet channel 11 and the air outlet channel 12 are located at the first end of the outer shell 1, and there is a settling space 4 between the inner walls of the adsorption unit 2 and the second end, after the gas enters the outer shell 1 through the air inlet channel 11, it will flow through the adsorption unit 2 and flow towards the second end. When the gas flows to the settling space 4, it will turn back. The gas flows through the filter element unit 3 towards the first end and is finally discharged through the outlet port and outlet channel 12, thus achieving the purification operation of gas adsorption followed by filtration. As the gas flows inside the outer shell 1, it passes through the settling space 4 and reverses its flow direction, causing dust, debris, and other particulate matter in the gas to be captured in the settling space 4 under the action of inertial collision and gravitational settling, which greatly improves the purification effect of the filtration device on the gas. The adsorption unit 2 and the filter element unit 3 of the filtration device are integrated into the same outer shell 1, which can perform the purification operation of gas adsorption followed by filtration. There is no need to set up a series structure consisting of two independent filters and adsorbers. The structure is compact and occupies little space. At the same time, the filtration device has a strong settling and capture ability for dust and other particulate matter, with strong filtration capacity and good purification effect.

[0042] In this embodiment, both the adsorption unit 2 and the filter element unit 3 are circular cylindrical structures. The filter element unit 3 is installed in the through flow cavity inside the adsorption unit 2. After the gas to be purified enters the interior of the outer shell 1 through the air inlet channel 11, it will flow through the adsorption unit 2 in the direction from the first end to the second end. Then the gas enters the settling space 4 to settle the dust. After that, the gas enters the flow cavity in the direction from the second end to the first end and flows through the filter element unit 3. After being filtered by the filter element unit 3, it enters the interior of the filter element unit 3 and finally passes through the air outlet port and the air outlet channel 12, thereby completing the adsorption and filtration.

[0043] Furthermore, such as Figure 2 and Figure 3 As shown, multiple annular ribs 141 are spaced apart in the settling space 4, and a settling trough 142 is formed between two adjacent annular ribs 141. When the gas flows through the annular ribs 141, it will collide with the annular ribs 141. The dust and other particles mixed in will be separated from the airflow due to inertia and captured in the settling trough 142. At the same time, the multiple annular ribs 141 and the multiple settling troughs 142 can reduce the gas flow rate and provide sufficient time for the particles to settle, thereby improving the capture effect of the particles.

[0044] In this embodiment, as Figure 2 As shown, the settling space 4 is a cylindrical or frustum-shaped space that matches the shape of the adsorption unit 2. The bottom of the settling space 4 is provided with three annular ribs 141 at intervals. An annular settling groove 142 is formed between two adjacent annular ribs, and a circular settling groove 142 is formed in the middle. The central settling groove 142 is connected to the flow cavity above. After the gas enters the settling space 4, it will flow laterally from the outermost settling groove 142 to the center under pressure, and then flow upward to the flow cavity through the central settling groove 142.

[0045] Specifically, along the gas flow direction, the depth of the settling tank 142 gradually increases, forming a gradient structure of stepwise settling. This gradually extends the residence time of the gas in the settling tank 142, allowing particles of different sizes in the gas to gradually separate during the stepwise descent, significantly improving the capture efficiency of particles in the gas and thus improving the purification effect of the gas.

[0046] To further improve the settling effect of particulate matter, such as Figure 2 and Figure 3 As shown, a slope is provided on the side of the annular rib 141 facing away from the airflow. Specifically, when the gas flows laterally in the settling space 4, the slope structure of the annular rib 141 can slow down the airflow, preventing the particles deposited in the settling tank 142 from being stirred up again. At the same time, the reduced gas velocity can further enhance the gravity settling effect of the particles. The slope inclination angle on different annular ribs 141 can be the same or different.

[0047] like Figure 2 As shown, a spacer cavity 5 is formed between the filter element unit 3 and the adsorption unit 2. The spacer cavity 5 is connected to the settling space 4. The gas entering the flow chamber will first enter the spacer cavity 5 and then flow through the filter element unit 3. Therefore, the spacer cavity 5 can accommodate the dust, debris and other particles that are intercepted by the filter element unit 3 but not settled by the settling space 4. In addition, the spacer cavity 5 also isolates the filter element unit 3 and the adsorption unit 2, preventing the adsorption unit 2 from sticking to the filter element unit 3 under the action of air pressure and blocking the gas passage of the filter element unit 3, so as to avoid the failure of the filter element unit 3.

[0048] In this embodiment, the filter element unit 3 and the adsorption unit 2 are axially aligned in the flow cavity. The outer diameter of the filter element unit 3 is smaller than the inner diameter of the adsorption unit 2. Therefore, the filter element unit 3 and the adsorption unit 2 form an annular space. At the same time, there is a height difference between the bottom of the filter element unit 3 and the bottom of the adsorption unit 2. The space formed by this height difference is connected to the aforementioned annular space and together they form the spacer cavity 5.

[0049] The specific structure of adsorption unit 2 can be set according to the actual situation. For example, such as Figure 2 and Figure 4 As shown, the adsorption unit 2 includes a support perforated plate 21 and an adsorbent 22. The support perforated plate 21 is connected to the inner wall of the outer shell 1, and the adsorbent 22 is fixedly disposed on the support perforated plate 21. The support perforated plate 21 and the inner wall of the outer shell 1 enclose a settling space 4. A first group of holes 211 and a second group of holes 212 are provided on the support perforated plate 21. Both the first group of holes 211 and the second group of holes 212 include multiple through holes. Along the gas flow direction, the first group of holes 211 is positioned directly opposite the adsorbent 22. The settling space 4 is connected to the spacer cavity 5 through the second group of holes 212. Specifically, along the gas flow direction, the second group of holes 212 is positioned directly opposite the settling trough 142 at the center of the settling space 4.

[0050] Specifically, such as Figure 2 and Figure 4As shown, the adsorption unit 2 also includes a first support 23, which is composed of an upper outer perforated plate and a lower main body. The outer perforated plate is annular with through holes, and the main body is a cylindrical structure with openings at both ends and closed side walls. The upper surface of the outer perforated plate is the air inlet face. A support plate 21 is disposed on the inner wall of the outer shell 1, and the main body of the first support 23 is fixedly connected to the support plate 21. The adsorbent 22 is fixedly disposed between the lower support plate 21 and the upper outer perforated plate, and is fixedly attached to the side of the main body. Therefore, the first support 23 and the support plate 21 are connected together. 1. The adsorbent 22 provides support and fixation. The type of adsorbent 22 can be selected based on the actual gas to be purified and the gravity of the main impurities to be removed, such as activated carbon, silica gel, molecular sieves, etc. Multiple adsorbents 22 can be sequentially arranged along the gas flow direction to achieve the removal of various impurities. The support plate 21 is a circular plate. The first group of holes 211 on it is located below the adsorbent 22, and the through holes of the first group of holes 211 are connected to the settling space 4. The second group of holes 212 is located below the spacer cavity 5, and the settling space 4 is connected to the spacer cavity 5 through the through holes of the second group of holes 212. It can be understood that after the gas to be purified passes through the adsorbent 22, it will enter the settling space 4 downwards through the through holes of the first group of holes 211. After flowing laterally and settling dust in the settling space 4, the gas will rise upwards through the second group of holes 212 into the spacer cavity 5, and then be filtered by the filter element unit 3.

[0051] In this embodiment, two types of adsorbent 22 are provided, namely activated carbon and molecular sieve, and the two types of adsorbent 22 are separated by a mesh screen.

[0052] To improve the purification effect on gases, such as Figure 2 and Figure 3 As shown, the air intake channel 11 includes an air inlet 111 and a uniform flow channel 112 connected to each other. The uniform flow channel 112 is arranged in a ring shape, and its cross-sectional area gradually decreases along the gas flow direction. Specifically, after the adsorption unit 2 and the filter element unit 3 are installed in the housing 1, the upper surface (air intake end face) of the adsorption unit 2 and the inner wall of the housing 1 enclose the uniform flow channel 112. Along the height direction, a certain point above the uniform flow channel 112 is connected to the outside through the air inlet 111. The lower annular opening of the uniform flow channel 112 is connected to the air intake end face. At the same time, since the cross-sectional area of ​​the uniform flow channel 112 gradually decreases along the gas flow direction, the gas can still have a sufficient flow velocity when it flows along the uniform flow channel 112 to the farthest position, so that the gas to be purified can be evenly distributed on all parts of the air intake end face after entering through the air inlet 111.

[0053] Furthermore, such as Figures 1 to 3As shown, a pressure relief hole 143 is provided on the outer casing 1, and a valve is installed in the pressure relief hole 143. The settling space 4 is connected to the outside through the pressure relief hole 143. The pressure relief hole 143 can relieve the pressure inside the outer casing 1 to release residual gas pressure and ensure safety when disassembling the outer casing 1. In this embodiment, the valve is installed in the pressure relief hole 143. During normal use, the valve is in the closed state to ensure the sealing of the outer casing 1 and prevent gas leakage. When it is necessary to disassemble the outer casing 1 to repair the internal structure, the staff needs to open the valve first to release the residual gas in the outer casing 1 and reduce the internal gas pressure to a safe level before disassembling the outer casing 1. In another embodiment, the pressure relief hole 143 can also be connected to an external pressure relief pipe, and the valve is installed on the pressure relief pipe.

[0054] The specific structure of the outer casing 1 can be set according to the actual situation. For example, such as... Figure 1 and Figure 2 As shown, the outer casing 1 includes a cylindrical body 13 and a bottom cover plate 14. The end of the cylindrical body 13 away from the bottom cover plate 14 is the first end, and the bottom cover plate 14 is the second end. The cylindrical body 13 has an installation port, and the bottom cover plate 14 is detachably connected to the installation port. A pressure relief hole 143 is opened in the bottom cover plate 14. Specifically, the cylindrical body 13 has a cylindrical structure with an installation port at one end for inspection and replacement of the internal adsorption unit 2 and filter element unit 3. The bottom cover plate 14 is bolted to the cylindrical body 13 to seal the installation port and form a settling space 4 with the adsorption unit 2.

[0055] like Figure 2 and Figure 3 As shown, multiple annular ribs 141 with different inner diameters are concentrically arranged on the bottom cover plate 14, thereby forming multiple annular settling grooves 142, with the innermost one being a circular settling groove 142; the edge of the support plate 21 abuts against the bottom cover plate 14 vertically, and is pressed against the top by the cylinder 13, thereby fixing it between the cylinder 13 and the bottom cover plate 14; at the same time, a first sealing ring 6 is also provided between the bottom cover plate 14 and the cylinder 13. The first sealing ring 6 is an O-ring commonly used in the art, which can seal the gap between the bottom cover plate 14 and the cylinder 13 to prevent the gas to be purified from leaking.

[0056] like Figure 2As shown, the filter element unit 3 includes a filter element body 31, a connector 32, a second support 33, and a base 34. The second support 33 is a cylindrical structure made of wire mesh. The filter element body 31 is a particulate filter cloth commonly used in the art. The filter element body 31 is attached and fixed to the second support 33, which provides support and shaping for the filter element body 31. The top ends of the second support 33 and the filter element body 31 are both fixedly connected to the connector 32, and the bottom ends of the second support 33 and the filter element body 31 are both fixedly connected to the base 34. Therefore, the filter element body 31, the second support 33, the connector 32, and the base 34 are fixedly connected as a whole. The connector 32 is a cylindrical structure. The connector 32 is detachably connected to the inner wall of the outer shell 1, and the internal channel of the connector 32 is connected to the interior of the filter element body 31. The port of the connector 32 is the air outlet port of the filter element unit 3. The base 34 is below the support plate 21 of the adsorption unit 2, and there is a height difference between the base 34 and the support plate 21. The support plate 21 is fixedly connected to the base 34 by screws or bolts. The base 34 blocks the opening at one end of the filter element body 31. Therefore, the gas in the flow chamber can only enter the interior of the filter element body 31 from the outside to the inside through the annular space of the partition chamber 5, thereby ensuring that the gas is fully filtered.

[0057] like Figure 2 and Figure 3 As shown, a mounting base 15 is provided on the inner wall of the first end, and the mounting base 15 has a connecting hole 151, which communicates with the air outlet channel 12; the filter element unit 3 is threadedly connected to the connecting hole 151, and the air outlet port is connected to the air outlet channel 12 through the connecting hole 151. In this embodiment, the top of the inner wall of the first end protrudes downward with the mounting base 15, and the connecting hole 151 is provided at the center of the mounting base 15. The inner wall surface of the connecting hole 151 is provided with an internal thread, and the outer peripheral surface of the connector 32 is provided with an external thread. The connector 32 is connected to the mounting base 15 through the cooperation of the internal and external threads, and the air outlet port is connected to the connecting hole 151.

[0058] To further improve the sealing performance of this filter device, such as Figure 2 As shown, a second sealing ring 7 is sandwiched between the connector 32 and the mounting base 15. In this embodiment, the second sealing ring 7 is a commonly used O-ring in the art, which can seal the gap between the mounting base 15 and the connector 32 to prevent the gas to be purified from leaking.

[0059] like Figure 2 and Figure 3As shown (arrows in the figure indicate the direction of gas flow), the flow path of the gas to be purified inside the filter device provided in this embodiment is roughly as follows: First, the gas to be purified is input from the inlet 111, flows evenly to the inlet end face of the adsorption unit 2 after passing through the uniform flow channel 112, and then flows through the adsorbent 22 under pressure and enters the settling space 4 through the first hole group 211 of the lower support plate 21. Then, the gas flows laterally from the edge settling groove 142 to the center settling groove 142 in the settling space 4, and enters the spacer cavity 5 through the upper second hole group 212. After that, the gas will pass through the filter element unit 3, and the filtered dust and other particles will settle in the spacer cavity 5. The gas that enters the filter element unit 3 will flow upward through the outlet port into the connecting hole 151 of the mounting base 15, and finally be discharged through the outlet channel 12, thereby completing the filtration.

[0060] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A filtration device, characterized in that, include: The outer casing (1) has a first end and a second end, and an air inlet channel (11) and an air outlet channel (12) are provided on the first end. An adsorption unit (2) is disposed inside the outer shell (1) and located between the first end and the second end. The adsorption unit (2) has an air inlet end face, which is disposed directly opposite the air inlet channel (11). The adsorption unit (2) is used to adsorb impurities in the gas. The adsorption unit (2) has a flow chamber. A filter element unit (3) is inserted into the flow chamber. The filter element unit (3) is used to filter dust in the gas. The filter element unit (3) has an air outlet port, which is connected to the air outlet channel (12). There is a settling space (4) between the adsorption unit (2) and the inner wall of the second end. The settling space (4) is connected to the flow cavity. The air inlet channel (11), the adsorption unit (2), the settling space (4), the flow cavity, the filter element unit (3), and the air outlet channel (12) constitute the gas flow path.

2. The filtration device according to claim 1, characterized in that, Along the gas flow direction, the settling space (4) is provided with a plurality of annular ribs (141) at intervals, and a settling groove (142) is formed between two adjacent annular ribs (141).

3. The filtration device according to claim 2, characterized in that, Along the direction of gas flow, the depth of the settling tank (142) gradually increases.

4. The filtration device according to claim 2, characterized in that, The annular rib (141) has a slope on the side facing away from the airflow at its end.

5. The filtration device according to claim 1, characterized in that, A spacer cavity (5) is formed between the filter element unit (3) and the adsorption unit (2), and the spacer cavity (5) is connected to the settling space (4).

6. The filtration device according to claim 5, characterized in that, The adsorption unit (2) includes a support perforated plate (21) and an adsorbent (22). The support perforated plate (21) is connected to the inner wall of the outer shell (1), and the adsorbent (22) is fixedly disposed on the support perforated plate (21). The support perforated plate (21) and the inner wall of the outer shell (1) enclose the settling space (4). The support plate (21) is provided with a first hole group (211) and a second hole group (212). Both the first hole group (211) and the second hole group (212) include multiple through holes. Along the gas flow direction, the first hole group (211) is positioned directly opposite the adsorbent (22). The settling space (4) is connected to the spacer cavity (5) through the second hole group (212).

7. The filtration device according to claim 1, characterized in that, The air intake channel (11) includes an air inlet (111) and a uniform flow channel (112) connected to each other. The uniform flow channel (112) is arranged in a ring shape, and the cross-sectional area of ​​the uniform flow channel (112) gradually decreases along the gas flow direction.

8. The filtration device according to claim 1, characterized in that, The outer shell (1) is provided with a pressure relief hole (143), and a valve is provided in the pressure relief hole (143). The settling space (4) is connected to the outside through the pressure relief hole (143).

9. The filtration device according to claim 8, characterized in that, The outer shell (1) includes a cylindrical body (13) and a bottom cover plate (14), wherein the end of the cylindrical body (13) away from the bottom cover plate (14) is the first end, and the bottom cover plate (14) is the second end; The cylinder (13) has an installation port, the bottom cover plate (14) is detachably connected to the installation port, and the pressure relief hole (143) is opened on the bottom cover plate (14).

10. The filtration device according to any one of claims 1-9, characterized in that, A mounting base (15) is provided on the inner wall of the first end, and the mounting base (15) has a connecting hole (151) that is connected to the air outlet channel (12). The filter element unit (3) is threaded to the connecting hole (151), and the air outlet port is connected to the air outlet channel (12) through the connecting hole (151).

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