A fuel multi-stage filtering device

Abstract

The present invention discloses a fuel multi-stage filtering device. The fuel multi-stage filtering device includes a shell, a primary filter body and a secondary filter body respectively installed inside and outside the shell, the shell is provided with a first channel for fuel to flow in, and has at least two hollow surfaces; the primary filter body includes a supporting fence, a particulate filter medium sleeved on the periphery of the supporting fence, and end covers connected to both ends of the particulate filter medium, and is formed with a non-filtering side dirt holding cavity, the non-filtering side dirt holding cavity is connected to the first channel, the primary filter body and the shell form a filtering side clean cavity; the secondary filter body is provided with a second channel for fuel to flow out to the outside thereof, which is used to block water and pass oil. The fuel multi-stage filtering device of the present invention can arrange more particulate filter media and water-collecting media in a limited space, increase its effective filtering area, and improve the filtering capacity and service life of the filter element per unit volume.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel filtration, and in particular to a fuel multi-stage filtration device for a fuel supply system of an internal combustion engine. Background Art

[0002] Water and particulate matter in the fuel are extremely harmful to the fuel supply system of the internal combustion engine: the presence of water can lead to poor lubrication, causing wear and corrosion of the injectors and high-pressure pumps; particulate matter (such as dust, metal powder, etc.) can accelerate the wear of the high-pressure pump and cause clogging of the injectors.

[0003] Fuel filters with oil-water separation functions are typically installed in fuel supply systems to clean the fuel and remove water and particulate matter. With technological advancements, internal combustion engines are moving towards higher efficiency and energy efficiency, requiring filters with lightweight designs, improved filtration performance, and a longer service life.

[0004] Current fuel filters mostly utilize cylindrical filters, with the particulate filter housed within a tubular housing. When a water separator is also included, it's typically positioned concentrically with the filter media in the central portion of the tubular housing. These filters reduce particulate matter and water content in the fuel before it reaches the engine. However, in the flat, confined space of a vehicle, these cylindrical filters are often underutilized, resulting in a relatively small filter volume that struggles to meet the long life and high-efficiency filtration requirements of modern engine fuel filters.

[0005] Prior art patent US10253738B2 discloses a filter assembly for filtering diesel fuel used in diesel engines. The assembly is shaped like a relatively flat rectangular parallelepiped, utilizing one side of the rectangular parallelepiped for fuel filtration. Since no filter media is provided on the other sides of the rectangular parallelepiped for filtration, filters designed in this manner fail to maximize the filtration area within a limited space. Fluid mechanics and filtration knowledge indicate that the fuel flow rate and resistance per unit area through the filter medium are strongly negatively correlated with the size of the filtration area. For a given fuel flow rate, a reduction in filtration area increases the flow rate per unit area and the flow resistance. This increase in flow rate per unit area and flow resistance directly reduces the filter's filtration capacity. Furthermore, a reduction in filtration area reduces the filter's ability to intercept and retain impurities and its oil-water separation efficiency. Therefore, filters designed in this rectangular parallelepiped design rarely achieve substantial improvements in filtration performance and service life, or require the use of higher-performance filter media to meet these requirements. Summary of the Invention

[0006] The present invention provides a fuel multi-stage filtering device, aiming to solve the technical problems of poor filtering performance and short service life of a filter element per unit volume.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions.

[0008] A fuel multi-stage filter device, provided in an external assembly, comprises:

[0009] The housing is provided with a first passage for fuel to flow in and has at least two hollow surfaces;

[0010] a primary filter body installed inside the housing, the primary filter body comprising a support fence, a particle filter medium sleeved on the periphery of the support fence, and end caps connected to both ends of the particle filter medium, and forming a non-filtering side dirt holding cavity, the non-filtering side dirt holding cavity being in communication with the first channel, the primary filter body and the housing forming a filtering side clean cavity; and,

[0011] A secondary filter body is installed on the outside of the shell and is used for blocking water and passing oil. The secondary filter body is provided with a second channel for the fuel to flow out to the outside.

[0012] Optionally, the shell includes a cover and a base, the base is provided with an opening, and the opening is closed by the cover.

[0013] Optionally, each of the hollow surfaces is provided on the cover plate and the base;

[0014] The hollow surface is inlaid with a water-collecting medium and covered by the medium, which is used to collect water and filter out the fuel in the cleaning cavity on the filter side.

[0015] Optionally, one end cover of the primary filter body is provided with an oil port communicating with the first channel.

[0016] Optionally, the sealing method of the cover plate and the base includes one or a combination of welding, gluing, snapping, and clamping.

[0017] Optionally, a fastener is provided on the edge of the cover, and a buckle is provided on the opening of the base, and the fastener is correspondingly engaged with the buckle to close the cover to the base.

[0018] Optionally, the support fence has a plurality of transverse ribs, and the transverse ribs are arranged at staggered intervals.

[0019] Optionally, the secondary filter body includes a tubular water-blocking medium and a pipe rack for fixing the water-blocking medium, and the pipe rack is mounted on a mounting fixture on one side of the shell.

[0020] Optionally, the mounting fixture is a clamp, and the pipe rack is clamped on the clamp.

[0021] In the technical solution of the present invention, a primary filter body is arranged in a shell having at least two hollow surfaces, and its particulate filter medium is shaped by a supporting fence and an end cover to form a non-filter side dirt holding chamber; during filtering, the fuel enters the non-filter side dirt holding chamber from the first channel of the shell connected to the outside world, enters the filter side cleaning chamber after passing through the particulate filter medium, and completes the filtration of particulate pollutants in the fuel, and then the fine particles of water in the fuel are aggregated by the water-collecting medium embedded in the hollow surface of the shell, and enters the secondary filter body, and the water in the fuel is separated by the water-blocking medium to intercept the water and the water naturally settles in the fuel, and finally the clean fuel is sent to the engine injection system. The multi-stage fuel filtration device of the present invention enables more particulate filter media and water-collecting media to be arranged in a limited space, thereby increasing its effective filtration area. The increase in the effective filtration area can reduce the unit area flow rate of fuel through the filter element and reduce the resistance of fuel through the filter element (reducing energy consumption), thereby improving the particulate filtration efficiency and being able to accommodate more particulate impurities. At the same time, the reduction in the unit area flow rate of fuel through the filter element is conducive to the aggregation of water in the fuel, thereby improving the oil-water separation efficiency of the filter element, thereby achieving the dual effect of improving the filtration capacity and service life of the filter element per unit volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0023] Figure 1 An exploded view of an embodiment of a multi-stage fuel filter device provided by the present invention;

[0024] Figure 2 A three-dimensional structural diagram of an embodiment of a multi-stage fuel filter device provided by the present invention;

[0025] Figure 3 for Figure 1 A three-dimensional structural diagram of the middle cover plate and the water-collecting medium;

[0026] Figure 4 for Figure 1 The three-dimensional structure diagram of the middle-level filter;

[0027] Figure 5 for Figure 1 Exploded view of the middle-level filter;

[0028] Figure 6 for Figure 5 Three-dimensional structural diagram of the middle support fence;

[0029] Figure 7 for Figure 1 Exploded view of the secondary filter;

[0030] Figure 8 for Figure 2 Sectional view of plane AA.

[0031] Figure: Multi-stage fuel filter 100, housing 1, first channel 11, hollow surface 12, water-collecting medium 121, cover 13, fastener 131, first clip 131a, base 14, opening 141, fastener 142, second clip 142a, mounting clip top 15, electrical connector 16, primary filter 2, support fence 21, transverse ribs 211, vertical ribs 212, particulate filter medium 22, non-filter side 221, filter side 222, end cap 23, oil port 231, non-filter side dirt chamber 24, filter side clean chamber 25, secondary filter 3, second channel 31, water-blocking medium 32, pipe rack 33.

[0032] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0034] In order to better describe and illustrate the embodiments of the present application, reference may be made to one or more drawings, but the additional details or examples used to describe the drawings should not be considered as limiting the scope of the invention of the present application, any of the currently described embodiments or preferred methods.

[0035] In the description of the present invention, it should be noted that the terms "length", "width", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" etc., indicating directions or positional relationships, are based on the positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention, rather than indicating that the device referred to must have a specific direction or operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0037] Prior art patent US10253738B2 discloses a filter assembly for filtering diesel fuel used in diesel engines. The assembly is shaped like a relatively flat rectangular parallelepiped, utilizing one side of the rectangular parallelepiped for fuel filtration. Since no filter media is provided on the other sides of the rectangular parallelepiped for filtration, filters designed in this manner fail to maximize the filtration area within a limited space. Fluid mechanics and filtration knowledge indicate that the fuel flow rate and resistance per unit area through the filter medium are strongly negatively correlated with the size of the filtration area. For a given fuel flow rate, a reduction in filtration area increases the flow rate per unit area and the flow resistance. This increase in flow rate per unit area and flow resistance directly reduces the filter's filtration capacity. Furthermore, a reduction in filtration area reduces the filter's ability to intercept and retain impurities and its oil-water separation efficiency. Therefore, filters designed in this rectangular parallelepiped design rarely achieve substantial improvements in filtration performance and service life, or require the use of higher-performance filter media to meet these requirements.

[0038] In view of this, the present invention proposes a fuel multi-stage filtering device. Figure 1-8 For an embodiment of the multi-stage fuel filter device proposed by the present invention, please refer to Figure 1-8 The multi-stage fuel filter device 100 includes a housing 1 , a primary filter body 2 and a secondary filter body 3 .

[0039] Specifically, see Figure 1The housing 1 is square in shape. A first channel 11 is defined on its surface for fuel flow into the housing 1 , and two side surfaces of the housing 1 are symmetrically arranged with hollowed-out surfaces 12. The primary filter 2 is mounted within the housing 1 and includes a support fence 21, a particle filter medium 22 positioned around the support fence 21, and end caps 23 connected to both ends of the particle filter medium 22. The end caps 23 seal the open side of the particle filter medium 22 to form a non-filtering dirt chamber 24 within the housing. In this embodiment, the non-filtering dirt chamber 24 communicates with the first channel 11 through an opening in the cover plate 13. A filter-side clean chamber 25 is formed on the periphery of the primary filter 2, i.e., between the filter side 222 and the housing 1. The secondary filter 3 is mounted on the outside of the housing 1 to block moisture and allow fuel to pass through. The secondary filter 3 is provided with a second channel 31 for fuel to flow out of the secondary filter 3 and into the engine. It should be noted that the particle filter medium 22 is filter paper, the inner side of the particle filter medium 22 is a non-filtering side 221 , and the outer side is a filtering side 222 .

[0040] When filtering, see Figure 8 Fuel containing impurities enters the non-filter-side dirt chamber 24 through the first channel 11. After passing through the particulate filter medium 22 to remove impurities, it is filtered into the filter-side clean chamber 25. It then passes through the hollow surface 12 to enter the outside of the secondary filter body 3. After being water-blocked, the fuel is finally pumped into the engine. It should be noted that the hollow surface 12 can have multiple hollow surfaces 12 depending on the design of the housing 1. In this embodiment, the housing 1 is square and can be provided with up to six hollow surfaces.

[0041] In the technical solution of the present invention, the primary filter body 2 is arranged in a shell body 1 having at least two hollow surfaces, and its particulate filter medium 22 is shaped by a support fence 21 and an end cover 23 to form a non-filter side dirt holding cavity 24 having multiple non-filter sides 221; when filtering, the fuel enters the filter side clean cavity 25 from multiple filter sides, and enters the secondary filter body 3 through each hollow surface 12, and is finally pumped into the engine.

[0042] The multi-stage fuel filtration device of the present invention enables more particulate filter media 22 and water-collecting media 121 to be arranged in a limited space, thereby increasing its effective filtration area. The increase in the effective filtration area can reduce the unit area flow rate of the fuel through the filter element and reduce the resistance of the fuel through the filter element (reducing the energy consumption required for pumping oil), thereby improving the particulate filtration efficiency and being able to accommodate more particulate impurities. At the same time, the reduction in the unit area flow rate of the fuel through the filter element is conducive to the aggregation of water in the fuel, thereby improving the oil-water separation efficiency of the filter element, achieving the dual effect of improving the filtration capacity and service life of the filter element per unit volume.

[0043] In some embodiments of the present invention, the housing 1 includes at least one cover plate 13 and a base 14. The base 14 has at least one opening 141 on its side, which is enclosed by the cover plate 13. The first channel 11 is provided on the base 14. In this embodiment, one cover plate 13 is provided, and one opening 141 is correspondingly provided on one side of the base 14. Of course, depending on how the housing 1 is assembled, two or more cover plates 13 and openings 141 may be provided, which will not be described in detail here.

[0044] See also Figure 1 and 3 , each of the hollow surfaces 12 is respectively provided on the cover plate 13 and the base 14. In this embodiment, the cover plate 13 and the side of the base 14 facing the cover plate 13 are hollow surfaces 12. Of course, the housing 1 with a square structure can be provided with up to six hollow surfaces 12, and in this embodiment, two are preferred. A water-collecting medium 121 is provided on the hollow surface 12. The water-collecting medium 121 covers the hollow surface 12 and seals the hollow portion of the hollow surface 12. The water-collecting medium 121 can gather water and filter out the fuel in the filter-side cleaning cavity 25. It should be noted that the water-collecting medium 121 can be made of non-woven fabric or other materials that can absorb water. The water-collecting medium 121 is integrated with the hollow surface 12 by injection molding, welding, or gluing. Injection molding is preferably used for integrated molding to make its structure more compact.

[0045] See also Figure 4 One end cover 23 of the primary filter body 2 is provided with an oil port 231 communicating with the first channel 11 , so that the fuel enters the non-filter side dirt holding cavity 24 through the oil port 231 .

[0046] In some embodiments of the present invention, the cover 13 and the base 14 are sealed by welding, gluing, snap-fitting, or a combination thereof. It should be noted that the cover 13 and the base 14 are plastic parts. Ultrasonic welding can be a preferred welding method.

[0047] In some embodiments of the present invention, see Figure 1 、 38, the edge of the cover 13 is provided with a snap-fit portion 131, and the opening 141 of the base 14 is provided with a snap-fit portion 142. The snap-fit portion 131 and the snap-fit portion 142 are correspondingly snap-fitted to seal the cover 13 to the base 14. Of course, the snap-fit portion 131 and the snap-fit portion 142 can be directly snapped together or ultrasonically welded to achieve sealing, or a sealant or sealing member can be added between the snap-fit portion 131 and the snap-fit portion 142 to achieve sealing. Please refer to Figure 1 and 3 At the same time, in order to increase the connection strength between the cover plate 13 and the base 14, a plurality of first clamping pins 131a and second clamping pins 142a for mutual clamping are respectively provided on the cover plate 13 and the base 14. The first clamping pins 131a and the second clamping pins 142a can be provided on the inner side or the outer side of the base, thereby forming an internal clamping connection or an external clamping connection. Please refer to Figure 1 , as the preferred method, internal card connection is more reliable and has a more aesthetic appearance. Figure 8 The end caps 23 and the particle filter medium 22 can be sealed at their ends by hot melt welding, gluing, or heat-curing bonding. Hot melt welding is preferred due to its high production efficiency. Furthermore, the support fence 21 abuts against the end cap 23 within the non-filter side dirt chamber 24. Considering that the particle filter medium 22 may soften and even collapse after prolonged immersion, the support fence 21 can provide support.

[0048] In one embodiment of the present invention, see Figure 5 , the support fence 21 has a plurality of transverse ribs 211, and each of the transverse ribs 211 is staggered and spaced apart in the vertical direction. In this embodiment, each of the transverse ribs 211 is parallel to each other and has the same length, and expands the particulate filter medium 22 into a flat rectangular structure. This structure enables the particulate filter medium 22 to have the largest contact area within the limited non-filter side dirt holding chamber 24. It should be noted that the support fence 21 also has a plurality of vertical ribs 212 integrally formed with each of the transverse ribs 211, and each of the transverse ribs 211 is staggered and spaced apart on the vertical ribs 212 to form the support fence 21.

[0049] In one embodiment of the present invention, see Figure 5 The ends of each transverse rib 211 abut the particle filter medium 22, forming a non-filtering side dirt-receiving cavity 24. After entering the cavity, the fuel diffuses into it. Of course, the embodiments of the present invention are not limited to this. In other embodiments, the transverse ribs 211 on the support fence 21 can also be arranged in a cross-shaped pattern, or the particle filter medium 22 can be expanded into a rectangular parallelepiped structure.

[0050] In some embodiments of the present invention, see Figure 7 The secondary filter 3 comprises a tubular water-blocking medium 32 and a pipe rack 33. The water-blocking medium 32 is a hydrophobic oil-water separation mesh fabric that allows oil to pass through. The pipe rack 33 is integrally injection-molded with the water-blocking medium 32. A mounting clip 15 is provided on one side of the housing 1. The pipe rack 33 is mounted on the mounting clip 15. In this embodiment, the mounting clip 15 is a clamp. Furthermore, the second passage 31 communicates with the water-blocking medium 32 to deliver dehydrated fuel into the engine. The second passage 31 includes a sealing sleeve 311 for connection to the outside world and an oil pipe 312. The oil pipe 312 is located within the water-blocking medium 32 and is sealed to the pipe rack 33. The sealing sleeve 311 is interlocked with the oil outlet of the oil pipe 312.

[0051] It should be noted that the multi-stage fuel filtration device 100 is placed in the assembly filter chamber (not shown in the figure) and is connected to it by the above-mentioned first channel 11 and second channel 31. The fuel flows from the first channel 11 connected to the assembly filter chamber through the non-filter side dirt holding chamber 24, the particulate filter medium 22, the filter side clean chamber 25, the water-collecting medium 121, the secondary filter body 3, and the second channel 31 connected to the assembly filter chamber, and then flows out and is pumped into the engine.

[0052] The filter assembly chamber is also equipped with a grounding wire for conducting static electricity and a water level sensor. The grounding wire is electrically connected to the electrical connector 16 on the base 14, which is in turn electrically connected to one of the end caps 23 of the primary filter body 2, thereby dissipating static electricity generated by the fuel within the particle filter medium 22 to the outside world. The end cap 23 is made of a conductive material. Furthermore, the filter assembly chamber is equipped with a valve for draining water, which is interlocked with the water level sensor. When water accumulates in the fuel to a certain level, an alarm is triggered to initiate drainage.

[0053] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A fuel multi-stage filtration device, characterized in that: include: The housing (1) is provided with a first channel (11) for fuel to flow in, and has at least two hollow surfaces (12); a primary filter body (2) installed inside the housing (1), the primary filter body (2) comprising a support fence (21), a particle filter medium (22) sleeved on the periphery of the support fence (21), and end caps (23) connected to both ends of the particle filter medium (22), and forming a non-filtering side dirt holding cavity (24), the non-filtering side dirt holding cavity (24) being in communication with the first channel (11), the primary filter body (2) and the housing (1) forming a filtering side clean cavity (25); and, a secondary filter (3) mounted on the outside of the housing (1) and used for blocking water and passing oil, the secondary filter (3) being provided with a second channel (31) for fuel to flow out of the secondary filter; The housing (1) comprises a cover plate (13) and a base (14); the base (14) is provided with an opening (141); and the opening (141) is closed by the cover plate (13); Each of the hollow surfaces (12) is provided on the cover plate (13) and the base (14); The hollow surface (12) is inlaid with a water-collecting medium (121) and is covered by the water-collecting medium (121), which is used to collect water and filter out the fuel in the filter-side cleaning cavity (25); The secondary filter body (3) comprises a tubular water-blocking medium (32) and a pipe rack (33) for fixing the water-blocking medium (32); the pipe rack (33) is mounted on a mounting fixture (15) on one side of the housing (1).

2. The multi-stage fuel filter device according to claim 1, characterized in that: One end cover (23) of the primary filter body (2) is provided with an oil port (231) communicating with the first channel (11).

3. The multi-stage fuel filter device according to claim 1, characterized in that: The sealing method of the cover plate (13) and the base (14) includes welding, gluing, buckling, clamping or a combination thereof.

4. The multi-stage fuel filter device according to any one of claims 1 to 3, characterized in that: The edge of the cover plate (13) is provided with a fastening piece (131), the opening portion (141) of the base (14) is provided with a fastening piece (142), and the fastening piece (131) and the fastening piece (142) are correspondingly engaged to seal the cover plate (13) to the base (14).

5. The multi-stage fuel filter device according to claim 1, characterized in that: The support fence (21) has a plurality of transverse ribs (211), and the transverse ribs (211) are arranged at staggered intervals.

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