Single pass fuel tank air exchange filter

Abstract

The application discloses a single-channel oil tank air exchange filtering device, which comprises a shell provided with a containing cavity and first and second air vents in communication with the containing cavity; a filtering assembly arranged in the containing cavity and comprising air filtering units and oil filtering units arranged in sequence from the first air vent to the second air vent; the oil filtering unit comprises at least two oil filtering components arranged side by side in a first direction or a second direction, the at least two oil filtering components each have an elastically-deformable oil filtering core and a movable plate for extruding the oil filtering core; the device further comprises a power assembly for driving the movable plate to alternately move to extrude the oil filtering core; the first direction is perpendicular to the second direction, and the first direction is consistent with the arrangement direction of the filtering assembly. The oil filtering components and the power assembly are combined to realize alternating filtering of gas; the elastically-deformable oil filtering core and the movable plate capable of extruding the oil filtering core are combined to timely discharge oil deposited in the oil filtering unit, thereby preventing the problem of blockage.

Description

Technical Field

[0001] This invention relates to the field of air filtration unit technology, and more specifically to a single-pipe fuel tank air exchange filtration device. Background Technology

[0002] When the hydraulic system is working, the oil level in the tank rises and falls intermittently. When it rises, air is expelled from the inside out; when it falls, air is drawn in from the outside in. The air is filtered by an air filter unit installed inside the tank. Currently, both the expelled and drawn-in air are filtered by the same air filter unit. After a period of time, the filter layer becomes soaked with trapped oil. When air is drawn in, dust from the atmosphere settles on the surface of the filter layer, forming sludge, causing the filter layer to become clogged and hardened.

[0003] Patent CN114405178A describes a diversion-type oil tank air exchange filter. It consists of a filter element one fitted onto an inner central sleeve and a filter element two disposed on the inner side of an outer central sleeve. Filter element one is connected to the intake and exhaust ports, while filter element two is connected to the exhaust and outlet ports. This design separates the filtered inhaled and exhaled air. During inhalation, filter element one intercepts dust particles in the air, preventing contamination of the oil in the tank. During exhalation, filter element two intercepts oil mist carried in the air from the tank. The oil mist adheres to the inner wall of filter element two and eventually flows back to the oil tank along its inner wall, reducing clogging and extending the filter's lifespan. However, both the intake and exhaust ports are controlled by limiting valves to manage the diversion of inhaled and exhaled air. If these limiting valves age, the diversion effect will diminish.

[0004] Therefore, it is necessary to improve the existing fuel tank air exchange and filtration device. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects in the prior art and provide a single-pipe oil tank air exchange and filtration device. By using at least two oil filter components arranged side by side along a first or second direction, combined with a power component, the device achieves alternating filtration of the gas discharged from the oil tank, effectively ensuring the normal operation of the equipment. The oil filter element with elastic deformation, combined with a movable plate that can squeeze the oil filter element, achieves timely discharge of oil deposited in the oil filter unit, preventing the oil filter unit from becoming clogged after long-term use, and ensuring the flow and filtration of air in the receiving cavity.

[0006] To achieve the above-mentioned process effects, the technical solution of the present invention is: a single-channel oil tank air exchange and filtration device, comprising:

[0007] The housing is provided with a receiving cavity and a first vent and a second vent communicating with the receiving cavity;

[0008] The filter assembly is disposed within the receiving cavity and includes an air filter unit and an oil filter unit arranged sequentially from the first vent to the second vent.

[0009] The oil filtration unit includes at least two oil filtration components arranged side by side along a first direction or a second direction, each of the at least two oil filtration components having an elastically deformable oil filter element and a movable plate for squeezing the oil filter element; it also includes a power assembly that drives the movable plate to move alternately to squeeze the oil filter element;

[0010] The first direction is perpendicular to the second direction, and the first direction is consistent with the arrangement direction of the filter components.

[0011] A preferred technical solution is that the power component drives the movable plate to alternately rise and fall in the vertical direction to squeeze the oil filter element.

[0012] A preferred technical solution is that the oil filtration component includes filter plates disposed on the surface of the oil filter element along a first direction, the filter plates include a filtration section and a baffle section connected along a vertical direction, the movable plate is disposed on the baffle section, and the thickness of the oil filter element along the vertical direction is greater than the height of the filtration section.

[0013] A preferred technical solution is that the power assembly includes:

[0014] Power source, providing rotational power;

[0015] The transmission gear components are arranged in pairs and have transmission pivot shafts extending along a first direction, which are connected to the movable plates one by one.

[0016] The drive gear has a drive pivot shaft extending in a first direction, is radially sandwiched between and meshes with the paired transmission gear components, and is connected to the power source via the drive pivot shaft.

[0017] A preferred technical solution is that the power source is a pendulum, the outer contour of the pendulum is fan-shaped, and the axis of the pendulum is consistent with the extension direction of the drive pivot shaft.

[0018] A preferred technical solution is that the transmission gear component includes at least two transmission gear sets arranged axially parallel to each other, and each of the at least two transmission gear sets has a first gear and a second gear fixedly connected coaxially. The outer diameter of the first gear is smaller than the outer diameter of the second gear and the drive gear. Adjacent transmission gear sets are meshed with each other through the first gear and the second gear. The first gear of one of the at least two transmission gear sets meshes with the drive gear, and the second gear of the other gear meshes with the movable plate.

[0019] A preferred technical solution is that the outer diameter of the second gear is greater than or equal to the outer diameter of the drive gear.

[0020] A preferred technical solution is that an oil-water barrier filter element is provided between the air filtration unit and the oil filtration unit, the oil-water barrier filter element including a hydrophilic / oleophobic layer facing the air filtration unit and a hydrophobic / oleophilic layer facing the oil filtration unit.

[0021] A preferred technical solution is that the oil-water barrier filter element further includes a waterproof and breathable membrane.

[0022] A preferred technical solution is that the oil filter element includes a hydrophobically modified sponge, the base of which is one or more combinations of melamine sponge, polyurethane sponge and cellulose sponge; the modifier of the hydrophobically modified sponge is one or more combinations of polysiloxane, organosilane, fluorinated alkylsilane, dopamine and nanoparticles.

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

[0024] The single-channel oil tank air exchange and filtration device has a reasonable structure. By using at least two oil filter components arranged side by side along the first or second direction, combined with the power unit, it can alternately filter the gas discharged from the oil tank, effectively ensuring the normal operation of the equipment.

[0025] The oil filter element with elastic deformation, combined with the movable plate that can squeeze the oil filter element, can promptly discharge the oil deposited in the oil filter unit, prevent the oil filter unit from becoming clogged after long-term use, and ensure the flow and filtration of air in the containment cavity. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the fuel tank and air exchange filter device of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the filter component of the present invention;

[0028] Figure 3 This is a partial schematic diagram of the oil filtration unit and power assembly of the present invention;

[0029] Figure 4 This is a partial schematic diagram of the oil filtration unit and power assembly (barrier-removing support plate) of the present invention;

[0030] Figure 5 yes Figure 4 Top view.

[0031] In the diagram: 1. Housing; 2. Filter assembly; 2-a. Air filter unit; 2-b. Oil filter unit; 2-c. Oil-water barrier filter element; 3. Power assembly; 10. Oil tank; 11. Baffle plate; 20. Oil filter component; 21. Movable plate; 22. Filter plate; 30. Barrier support plate; 31. Transmission gear assembly; 32. Power source; 33. Rack; 41. First filter element; 42. Second filter element; 43. Waterproof and breathable membrane; 101. First vent; 102. Second vent; 221. Baffle part; 222. Filter part; 211. First connecting rod; 301. Drive pivot shaft; 302. Transmission pivot shaft; 310. Transmission wheel set; 310a. First transmission wheel set; 310b. Second transmission wheel set; 310c. Third transmission wheel set; 311. First gear; 312. Second gear; 320. Drive gear. Detailed Implementation

[0032] The specific embodiments of the present invention will be further described below with reference to examples. These examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, 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, and therefore should not be construed as a limitation on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] The X-axis is the first direction, and the Y-axis is the second direction.

[0036] like Figures 1-5 As shown, the present invention discloses a single-channel fuel tank air exchange and filtration device, including a housing 1 and a filter assembly 2. The housing 1 is provided with a receiving cavity and a first vent 101 and a second vent 102 communicating with the receiving cavity. The filter assembly 2 is disposed in the receiving cavity and includes an air filter unit 2-a and an oil filter unit 2-b arranged sequentially from the first vent 101 to the second vent 102.

[0037] When the hydraulic system is working, the oil level in the tank rises or falls intermittently. When the level falls, outside air enters the filter assembly 2 through the first vent 101 and then enters the oil tank through the second vent 102. When the level rises, air inside the oil tank enters the filter assembly 2 through the second vent 102 and is then discharged to the outside air through the first vent 101. Therefore, the first vent 101 can both draw in and discharge air from the oil tank, and similarly, the second vent 102 can also both draw in and discharge air from the oil tank.

[0038] The housing 1 can be any geometric shape; for structural simplicity, it is a cuboid. A removable top cover is provided on the top of the housing 1 for easy replacement and repair of the filter assembly 2. The length direction of the housing 1 is the first direction, and the width direction is the second direction. A first vent 101 is located on one end face along the length extension direction of the housing 1. To block dust and rainwater, adapt to different environments, and improve the flexibility and versatility of applications, a baffle 11 is provided on the first vent 101. A second vent 102 is connected to the oil tank 10.

[0039] The first direction is perpendicular to the second direction, and the first direction is consistent with the arrangement direction of the filter component 2.

[0040] like Figure 2 As shown, the oil filtration unit 2-b has the following arrangement structures: First, the oil filtration unit 2-b includes at least two oil filtration components 20 arranged side-by-side along a first direction; second, the oil filtration unit 2-b includes at least two oil filtration components 20 arranged side-by-side along a second direction. The second arrangement structure occupies less space, is suitable for a wider range of scenarios, and offers greater flexibility in use.

[0041] At least two oil filter components 20 each have an elastically deformable oil filter element (not shown) and a movable plate 21 for squeezing the oil filter element, and also include a power assembly 3 for driving the movable plate 21 to move alternately to squeeze the oil filter element.

[0042] like Figures 3-5As shown, the power assembly 3 drives the movable plate 21 to alternately rise and fall in the vertical direction to squeeze the oil filter element. The oil filter component 20 includes filter plates 22 disposed on the surface of the oil filter element along a first direction. The filter plates 22 include a filter section 222 and a baffle section 221 connected in the vertical direction. The movable plate 21 is disposed on the baffle section 221. The thickness of the oil filter element in the vertical direction is greater than the height of the filter section 222. The filter section 222 has filter holes to facilitate air permeability. The baffle section 221 is a sealed structure. When the movable plate 21 rises and falls in the baffle section 221, a gap is generated between the baffle section 221 and the top cover of the housing. The sealed baffle section 221 effectively blocks the gas of the unfiltered oil. The setting of the filter section 222 effectively ensures that gas can still flow when the movable plate 21 rises and falls alternately.

[0043] The oil filter components 20 are arranged in pairs, each equipped with an oil filter element. When one oil filter element is deformed by the movable plate 21, it is in a discharge state, resulting in reduced filtration efficiency. When the deformation reaches its limit, it ceases to function as a filter. The other oil filter element returns to its initial state from the deformed state and resumes its filtration function. Under the action of the power component 3, the oil filter element switches between the filtration state and the discharge state. At least one oil filter element in the oil filter component 20 performs its filtration function, meaning the paired oil filter components 20 are used alternately. Therefore, the oil filter unit 2-b ensures its filtration function and effectively solves the problem of filtration failure caused by clogging of the oil filter unit 2-b, thus improving the service life of the device.

[0044] like Figures 3-5 As shown, the power assembly 3 includes a power source 32, transmission gear components 31, and a drive gear 320. The power source 32 provides rotational power. The transmission gear components 31 are arranged in pairs, and the drive gear 320 is sandwiched between the paired transmission gear components 31 and meshes with them. Each transmission gear component 31 has a transmission pivot shaft 302 extending along a first direction, and the paired transmission gear components 31 are connected to the movable plate 21 one-to-one. The drive gear 320 has a drive pivot shaft 301 extending along the first direction, and the drive gear 320 is connected to the power source 32 through the drive pivot shaft 301. To ensure that the lifting and lowering amplitude of the movable plate 21 is consistent, the paired transmission gear components 31 are symmetrically arranged radially on both sides of the drive gear 320.

[0045] The power source 32 is a pendulum with a fan-shaped outer contour. The axis of the pendulum is aligned with the extension direction of the drive pivot shaft 301. The pendulum's swing amplitude drives the drive gear 320, whose axis is the same as the axis of the concentric cylinder of the fan-shaped pendulum. To ensure that the paired movable plates rise and fall at the same height, achieving dynamic balance, the drive pivot shaft 301 is positioned on the axis of symmetry of the pendulum. During operation, the hydraulic tank will vibrate or shake, causing the pendulum to swing and generate an amplitude, which in turn drives the drive gear 320 to rotate.

[0046] Because the vibration or shaking amplitude generated by the operation of the hydraulic oil tank is small, the swing amplitude of the pendulum is also small. In order to increase the lifting stroke of the movable plate 21, in this embodiment, the transmission gear component 31 includes three transmission wheel sets 310 arranged parallel to each other on the axis. Each of the three transmission wheel sets 310 has a first gear 311 and a second gear 312 that are coaxially fixedly connected. The outer diameter of the first gear 311 is smaller than the outer diameter of the second gear 312 and the drive gear 320. Among them, the first gear 311 of the first transmission wheel set 310a meshes with the drive gear 320, the second gear 312 of the first transmission wheel set 310a meshes with the first gear 311 of the second transmission wheel set 310b, the second gear 312 of the second transmission wheel set 310b meshes with the first gear 311 of the third transmission wheel set 310c, and the second gear 312 of the third transmission wheel set 310c is connected to the movable plate 21 one by one through a rack 33, which extends in the vertical direction.

[0047] like Figure 5As shown, specifically, the radius of the pendulum is 2n, where π / 3 ≤ 2n < π / 2. Since the outer diameter of the drive gear 320 is larger than the outer diameter of the first gear 311, at its maximum limit, the rotation radius of the drive gear is n. The rotation radius of the first gear 311 in the first transmission gear set 310a is then m, where m > n. The first gear 311 in the first transmission gear set 310a drives the coaxially fixed second gear 312 to increase its speed. Because the outer diameter of the second gear 312 is larger than the outer diameter of the first gear 311, the rotation radius of the second gear 312 in the first transmission gear set 310a is m. The rotation radius of the first gear 311 in the second transmission gear set 310b is x, where x > m. The first gear 311 in the second transmission gear set 310b drives the coaxially fixed... The second gear 312 of the second transmission gear set 310b rotates at an increased speed. Similarly, the first gear 311 of the third transmission gear set 310c rotates at an angle of x, while the first gear 311 of the third transmission gear set 310c rotates at an angle of y, where y > x. The first gear 311 of the third transmission gear set 310c drives the coaxially fixed second gear 312 to rotate at an increased speed. The second gear 312 of the third transmission gear set 310c rotates at an angle of y. According to the arc length formula, with a fixed outer diameter of the second gear 312 of the third transmission gear set 310c, the larger y is, the longer the arc length, thus increasing the lifting stroke of the movable plate 21. The number of transmission gear sets 31 is not limited to three, but depends on the space available for the arrangement of the transmission gear sets 31.

[0048] Among them, the rack 33 extends in the vertical direction, and the movable plate 21 is provided with a first connecting rod 211. The first connecting rod 211 extends perpendicular to the rack 33 and is fixedly connected to the rack 33.

[0049] To improve the rotational speed and transmission efficiency of the transmission gear set, the outer diameter of the second gear 312 is further greater than or equal to the outer diameter of the drive gear 320.

[0050] To prevent unfiltered oil gas from accumulating on the power assembly 3, a barrier support plate 30 is provided around the power assembly 3. The drive pivot shaft 301 of the drive gear 320 and the transmission pivot shaft 302 of the transmission gear component 31 are both rotatably connected to the barrier support plate 30. A second vent 102 is located between the oil filtration unit 2-b and the power assembly 3.

[0051] The filter plate 22 can be one or more of metal mesh, cellulose, and ceramic, and can be a single-layer structure or a composite structure. To ensure the permeability of the oil filtration unit 2-b and prevent clogging, the filter plate 22 is further made of a superoleophobic and superhydrophobic modified metal mesh. The metal mesh includes, but is not limited to, stainless steel mesh, iron mesh, and copper mesh. Stainless steel, being an alloy, possesses excellent mechanical properties and corrosion resistance.

[0052] Preparation of superoleophobic and superhydrophobic modified stainless steel mesh: First, the surface of the stainless steel mesh is pretreated, mainly to remove oil stains and impurities; then, the surface of the stainless steel mesh is roughened by immersing the pretreated stainless steel in a sodium carbonate solution, ultrasonically cleaning it again, and drying it. The mesh is then reacted with a solution of magnesium nitrate hexahydrate, aluminum nitrate nonahydrate, zinc nitrate hexahydrate, urea, and deionized water; next, the stainless steel surface is treated with low surface energy by adding the roughened stainless steel mesh to a toluene solution, followed by the dropwise addition of 1H,1H,2H,2H-perfluorodecyltrichlorosilane (FTS), allowing the FTS to fully graft onto the surface of the stainless steel mesh. After cleaning and drying, the superoleophobic and superhydrophobic modified stainless steel mesh is obtained.

[0053] To filter the oil carried out from the second vent of the oil tank and to allow the oil filter element to be deformed by compression, thus enabling oil recycling and maintaining the air permeability of the oil filtration unit, the oil filter element includes a hydrophobically modified sponge. The base of the hydrophobically modified sponge is one or more combinations of melamine sponge, polyurethane sponge, and cellulose sponge; the modifier of the hydrophobically modified sponge is one or more combinations of polysiloxane, organosilane, fluorinated alkylsilane, dopamine, and nanoparticles. Further, the base of the hydrophobically modified sponge is melamine sponge. The nanoparticles include organic and inorganic nanoparticles, such as MoS2, SiO2, CNTs, GO, and Fe3O4.

[0054] To further purify the air used in the fuel tank and the gas discharged from the fuel tank, an oil-water barrier filter element 2-c is provided between the air filter unit and the oil filter unit. The oil-water barrier filter element 2-c includes a hydrophilic / oleophobic layer facing the air filter unit 2-a and a hydrophobic / oleophobic layer facing the oil filter unit 2-b. The oil-water barrier filter element 2-c includes a first filter element 41 and a second filter element 42 arranged along a first direction. The first filter element 41 is close to the air filter unit 2-a, and the first filter element 41 and the second filter element 42 are detachably connected. One connecting surface of the first filter element 41 and the second filter element 42 has a groove, and the other connecting surface has a protrusion. The extension direction of the groove is consistent with the height direction of the housing, allowing the top cover to be opened to install and remove the first filter element 41 and / or the second filter element 42, making operation simple and flexible. The groove opening width is smaller than the groove bottom width, improving the connection strength of the first filter element 41 and the second filter element 42 and preventing delamination along the first direction.

[0055] The hydrophilic / oleophobic layer is one or a combination of titanium dioxide coating, shell powder coating and hydrogel coating.

[0056] Method 1 for preparing a first filter element with a hydrogel coating:

[0057] 3-(2,3-epoxypropoxy)propyltrimethoxysilane and hydrochloric acid were dissolved in ethanol, and the pH of the mixture was adjusted to 4.0. Then, hydrophilic SiO2 was ultrasonically dispersed into the solution, sprayed onto a carrier, and dried to obtain a substrate for later use.

[0058] Polyvinyl alcohol is dispersed in deionized water at 85–90°C to form a first solution; polydiallyl dimethyl ammonium chloride and SiO2 are added to the deionized water to form a second solution. The first and second solutions are stirred and mixed evenly, and then coated on the surface of the above-mentioned substrate to obtain a first filter element with a hydrogel coating.

[0059] To further improve the hydrophilic barrier performance of the first filter element, the first filter element is made by combining magnetic nanoparticles, fluorine groups and hydrophilic units on a sponge.

[0060] The second method for preparing the first filter element involves immersing a sponge in an ethanol solution of Fe3O4, then immersing the sponge with Fe3O4 attached in an ethanol solution of perfluorooctanoic acid and bis[3-(trimethoxysilyl)propyl]amine, and finally drying it for later use. The resulting first filter element contains fluorine groups and magnetic nanoparticles, thus endowing it with hydrophilic / oleophobic properties.

[0061] The material of the second filter element includes, but is not limited to, powder, foam, sponge, and aerogel. For recyclability, the second filter element is further made of sponge, with the sponge selected from one or more combinations of melamine sponge, polyurethane sponge, and cellulose sponge.

[0062] The hydrophobic / oleophilic layer is one or more of the following: polydimethylsiloxane, perfluorosiloxane, a combination of stearic acid and magnetic powder, polydopamine coating, tannic acid and iron ion composite coating, and catechol and polyamine polymer coating.

[0063] The oil-water barrier filter element 2-c also includes a waterproof and breathable membrane 43. The waterproof and breathable membrane 43 is sandwiched between the first filter element 41 and the second filter element 42 to further purify the air. The waterproof and breathable membrane 43 is a polyacrylic acid resin membrane constructed using polyvinyl alcohol and / or humic acid crosslinking agents.

[0064] When this single-channel oil tank air exchange and filtration device is in use, the hydraulic system is activated, and the oil level in the oil tank rises or falls intermittently. When the level falls, outside air enters the filter assembly 2 through the first vent 101, and passes sequentially through the air filter unit 2-a, the oil-water barrier filter element 2-c, and the oil filter unit 2-b. Moisture in the outside air is reabsorbed by the hydrophilic / oleophobic layer set in the oil-water barrier filter element 2-c. The hydrophobic / oleophobic layer then blocks the dry and clean air, which then enters the oil tank through the second vent 102. When the level rises, the air in the oil tank enters the filter assembly 2 through the second vent 102, and passes sequentially through the oil filter unit 2-b, the oil-water barrier filter element 2-c, and the air filter unit 2-a. The oil in the air in the oil tank is absorbed by the hydrophobic / oleophobic layer set in the oil filter unit 2-b and the air filter unit 2-a. The waterproof and breathable membrane 43 and the hydrophilic / oleophobic layer block the dry and clean air, which is then discharged to the outside air through the first vent 101, completing the air filtration and exchange. Among them, the oil filtration unit 2-b acts on the movable plate 21 through the power component 3. The movable plate 21 reciprocates and rises to squeeze the oil filter element to deform it, thereby squeezing out the oil that is filtered and retained on the oil filter element and returning it to the oil tank through the second vent 102, ensuring the smoothness of air filtration and exchange of the device.

[0065] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A single-channel fuel tank air exchange and filtration device, comprising: The housing (1) is provided with a receiving cavity and a first vent (101) and a second vent (102) communicating with the receiving cavity. The filter assembly (2) is disposed in the receiving cavity and includes an air filter unit (2-a) and an oil filter unit (2-b) arranged sequentially from the first vent (101) to the second vent (102). The oil filtration unit (2-b) is characterized in that it includes at least two oil filtration components (20) arranged side by side along a first direction or a second direction, each of the at least two oil filtration components (20) having an elastically deformable oil filter element and a movable plate (21) for squeezing the oil filter element; it also includes a power assembly (3) that drives the movable plate (21) to move alternately to squeeze the oil filter element; The first direction is perpendicular to the second direction, and the first direction is consistent with the arrangement direction of the filter component (2); The power unit (3) drives the movable plate (21) to alternately rise and fall in the vertical direction to squeeze the oil filter element; The oil filter component (20) includes filter plates (22) disposed on the surface of the oil filter element along a first direction. The filter plate (22) includes a filter section (222) and a baffle section (221) connected along the vertical direction. The movable plate (21) is disposed on the baffle section (221). The thickness of the oil filter element along the vertical direction is greater than the height of the filter section (222). The power assembly includes: Power source (32) provides rotational power; The transmission gear components (31) are arranged in pairs and have transmission pivot shafts (302) extending in a first direction, which are connected to the movable plates (21) one by one. The drive gear (320) has a drive pivot shaft (301) extending in a first direction, which is radially sandwiched between and meshed with the pair of transmission gear components (31), and is connected to the power source (32) via the drive pivot shaft (301).

2. The single-channel fuel tank air exchange and filtration device according to claim 1, characterized in that, The power source (32) is a pendulum, the outer contour of which is fan-shaped, and the axis of which is consistent with the extension direction of the drive pivot shaft (301).

3. The single-channel fuel tank air exchange and filtration device according to claim 1, characterized in that, The transmission gear component (31) includes at least two transmission gear sets (310) arranged axially parallel to each other. Each of the at least two transmission gear sets (310) has a first gear (311) and a second gear (312) that are coaxially fixedly connected. The outer diameter of the first gear (311) is smaller than the outer diameter of the second gear (312) and the drive gear (320). The adjacent transmission wheel sets (310) mesh with each other through the first gear (311) and the second gear (312); At least two of the transmission gear sets (310) have a first gear (311) that meshes with the drive gear (320) and a second gear (312) that meshes with the movable plate (21).

4. The single-channel fuel tank air exchange and filtration device according to claim 3, characterized in that, The outer diameter of the second gear (312) is greater than or equal to the outer diameter of the drive gear (320).

5. The single-channel fuel tank air exchange and filtration device according to claim 1, characterized in that, An oil-water barrier filter element (2-c) is provided between the air filtration unit (2-a) and the oil filtration unit (2-b). The oil-water barrier filter element (2-c) includes a hydrophilic / oleophobic layer facing the air filtration unit and a hydrophobic / oleophilic layer facing the oil filtration unit.

6. The single-channel fuel tank air exchange filter device according to claim 5, characterized in that, The oil-water barrier filter element (2-c) also includes a waterproof and breathable membrane (43).

7. The single-channel fuel tank air exchange and filtration device according to claim 1, characterized in that, The oil filter element includes a hydrophobically modified sponge, the base of which is one or more combinations of melamine sponge, polyurethane sponge and cellulose sponge; the modifier of the hydrophobically modified sponge is one or more combinations of polysiloxane, organosilane, fluorinated alkylsilane, dopamine and nanoparticles.

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