Oil-water separator

Abstract

The invention discloses an oil-water separator, and relates to the technical field of oil-water separation. The oil-water separator comprises a shell and a filter element assembly, a separation cavity is formed in the shell, and an oil inlet and an oil outlet are formed in the shell. The filter element assembly is coaxially arranged in the separation cavity and divides the separation cavity into a dirty oil channel and a clean oil collecting cavity which are distributed in the radial direction. The filter element assembly comprises at least two filter element units stacked in the axial direction. Wherein each filter element unit comprises a central pipe and a filter material which are sequentially and coaxially arranged from inside to outside, a clean oil flow channel is formed in the central pipe, an annular separation flow channel is formed between the central pipe and the inner wall of the filter material, and an oil inlet flow channel is formed between the outer wall of the filter material and the inner wall of the shell. A communication unit is arranged between every two adjacent filter element units, and the communication units are configured to enable fluid of the separation flow channels of the adjacent filter element units to be communicated and enable the clean oil flow channels of all the filter element units to be communicated to form a clean oil collection cavity. The filtering and separating area is greatly increased, and the large-flow fuel oil treatment requirement is met.

Description

Technical Field

[0001] This invention relates to the field of oil-water separation technology, and more particularly to an oil-water separator. Background Technology

[0002] With the widespread application of high-horsepower engines in marine power, construction machinery, generator sets, and other fields, higher demands are placed on the reliability and durability of fuel systems. Especially with the promotion and use of alternative fuels such as biodiesel, the fuel itself has a stronger hygroscopic property, and the high workload and high fuel circulation flow of engines significantly increase the risk and harm of water contamination in the fuel. The presence of water can cause corrosion of metal components in the fuel system, accelerate the wear of precision parts, and may promote microbial growth, seriously affecting engine performance and service life.

[0003] Traditional oil-water separators typically employ a single filter element structure, whose processing capacity and separation efficiency are limited by a finite filtration area and a single flow channel design. Faced with the high fuel flow requirements of high-horsepower engines, simply increasing the filter element size leads to problems such as space constraints and soaring costs. While using multiple filter elements arranged in parallel can meet flow requirements, it often results in uneven flow field distribution and inconsistent loads on each filter element, making it difficult to achieve stable and efficient water separation. Furthermore, the system integration and reliability face challenges. Summary of the Invention

[0004] The purpose of this invention is to provide an oil-water separator that can effectively balance high flow rate processing capacity and consistently high separation efficiency within a limited space, in order to meet the stringent requirements of modern high-horsepower engines, especially those using biodiesel fuel, for fuel cleanliness.

[0005] To achieve this objective, the present invention adopts the following technical solution: An oil-water separator, comprising: The outer casing has a separation chamber inside, and the outer casing has an oil inlet and an oil outlet. A filter element assembly is coaxially disposed within the separation chamber and divides the separation chamber into radially distributed dirty oil channels and a clean oil collection chamber; the filter element assembly includes at least two filter element units stacked axially. Each filter element unit includes a central tube and a filter material arranged coaxially from the inside to the outside. A clean oil flow channel is formed inside the central tube, and an annular separation channel is formed between the central tube and the inner wall of the filter material. A connecting unit is provided between two adjacent filter elements. The connecting unit is configured to connect the separation channels of the adjacent filter elements and to connect the clean oil channels of all filter elements to form the clean oil collecting chamber.

[0006] As an optional solution for the oil-water separator, the filter element assembly is provided with a first end cap and a second end cap at both axial ends, the first end cap abutting against the outer shell, and the second end cap being sealed to the outer shell; The connecting unit is a connecting end cap disposed between two adjacent filter cartridge units.

[0007] As an alternative to the oil-water separator, the central tube includes a hydrophobic mesh cylinder and a guide plate spirally wound around the outer wall of the hydrophobic mesh cylinder, with the guide plate and the inner wall of the filter media forming the separation channel.

[0008] As an optional embodiment of the oil-water separator, the connecting end cap includes: The plate body has two side surfaces that are respectively connected to the end faces of two adjacent filter element units; The first convex ring and the second convex ring protrude coaxially from both sides of the plate body and are respectively sealed and inserted into the central tube of the two adjacent filter element units. The inner holes of the first convex ring and the second convex ring are connected to form a clean oil communication channel. A third protruding ring protrudes from one side surface of the plate and surrounds the outside of the first protruding ring, and at least one first connecting groove is formed between the third protruding ring and the first protruding ring; At least one connecting sleeve protrudes from the other side surface of the plate and is spaced apart from the second convex ring; the inner hole of the connecting sleeve is connected to the first connecting groove, together forming an oil-water connecting channel.

[0009] As an alternative to the oil-water separator, the outer casing includes a cylindrical shell, a top cover connected to the top of the shell, and a water collection cup connected to the bottom of the shell; The first end cap abuts against the upper cover, and the second end cap is sealed to the housing. The oil inlet is located on the housing and near the top cover, and the oil outlet is located on the housing and near the water collection cup.

[0010] As an alternative to the oil-water separator, the center of the second end cap is provided with a downwardly extending connecting sleeve; The housing is provided with an oil outlet pipe, one end of which forms the oil outlet, and the middle side wall of the oil outlet pipe is provided with a communication port that communicates with the clean oil collection chamber. The bottom end of the connecting sleeve is inserted into the connecting port and sealed to the oil outlet pipe.

[0011] As an optional embodiment of the oil-water separator, the centerline of the communication port is eccentrically set to the centerline of the housing; Two limiting protrusions are provided on the outer periphery of the connecting port, and two limiting grooves are provided on the second end cover accordingly; the distance between the two limiting protrusions and the center line of the connecting port is not equal, and the two limiting protrusions and the two limiting grooves are matched one-to-one to limit the installation position of the filter assembly in the circumferential direction, forming an anti-misinstallation structure. An axial limiting step is formed between the connecting port and the limiting protrusion to restrict the axial movement of the filter assembly.

[0012] As an optional feature of the oil-water separator, the oil inlet is provided with an oil inlet check valve that only allows oil to flow into the dirty oil channel; The oil outlet is equipped with a one-way valve that only allows oil to flow out of the clean oil collection chamber.

[0013] As an optional embodiment of the oil-water separator, the oil inlet check valve includes a first valve seat, a first valve core, and a first spring. The first valve seat is fixed inside the oil inlet pipe connected to the oil inlet, and the first valve core is axially movable inside the first valve seat. The first spring can apply a sealing force to the first valve core. The oil outlet check valve includes a second valve seat, a second valve core, and a second spring. The second valve seat is fixed inside the oil outlet pipe connected to the oil outlet. The second valve core is axially movable and disposed inside the second valve seat. The second spring can apply a sealing force to the second valve core.

[0014] As an optional embodiment of the oil-water separator, the oil inlet check valve further includes a first support frame, the first valve core is disposed inside the first support frame, one end of the first spring abuts against the first support frame, and the other end abuts against the first valve core. The oil outlet check valve also includes a second support frame, the second valve core is disposed outside the second support frame, one end of the second spring abuts against the second support frame, and the other end abuts against the second valve core.

[0015] As an optional embodiment of the oil-water separator, the first support frame includes a first support plate and a first support rib perpendicularly connected to the first support plate. The first support rib is spaced apart along the circumference of the first support plate. One end of the first spring abuts against the first support plate, and the first support rib is engaged with the first valve seat. The second support frame includes a second support plate and a second support rib perpendicularly connected to the second support plate. The second support rib is spaced apart along the circumference of the second support plate. One end of the second spring abuts against the second support plate, and the second support rib is engaged with the second valve seat.

[0016] As an optional embodiment of the oil-water separator, a first flap is vertically connected to the outer side of the first support rib. The first flap cooperates with the inner wall of the oil inlet pipe connected to the oil inlet, and an oil inlet channel is formed between adjacent first flaps. A second flap is vertically connected to the outer side of the second support rib. The second flap cooperates with the inner wall of the oil outlet pipe connected to the oil outlet, and an oil outlet channel is formed between adjacent second flaps.

[0017] As an optional embodiment of the oil-water separator, the top of the housing is provided with an oil filling hole, which is sealed by an oil filling plug; The top of the oil filler plug is provided with a tool operating part, and a limiting space is formed inside the tool operating part for use with a special disassembly and assembly tool.

[0018] As an optional solution for the oil-water separator, the tool operating section is provided with multiple radially extending limiting ribs, which divide the limiting space into multiple slots for cooperating with special disassembly and assembly tools.

[0019] The beneficial effects of this invention are: The oil-water separator provided by this invention significantly increases the filtration and separation area without increasing the radial installation space by configuring the filter element assembly as including at least two filter element units stacked axially, thus meeting the high-flow-rate fuel treatment requirements of high-horsepower engines. Each filter element unit includes a central tube and filter media arranged coaxially from the inside to the outside. The oil is forced to pass radially through the filter media with oleophilic and hydrophobic properties from the outside to the inside, and the water is effectively intercepted and collected in the separation channel, ensuring that each filter element unit is in a highly efficient working state. With multiple filter element units working simultaneously, the overall separation efficiency is greatly increased, thereby meeting the high water separation requirements under harsh conditions such as biodiesel. Integrating the filter element assembly into the separation chamber of the housing, the radial separation design of the dirty oil channel and the clean oil collection chamber in the separation chamber avoids short-circuiting or local dead zones of the fluid, ensuring that the fuel flow is evenly distributed among the filter element units. This achieves high flow rate and high separation efficiency while effectively controlling the overall flow resistance, which is beneficial to the stable operation of the engine fuel system. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the oil-water separator provided in an embodiment of the present invention; Figure 2 yes Figure 1 Sectional view along the middle AA direction; Figure 3 This is a top view of the housing provided in an embodiment of the present invention; Figure 4 This is a cross-sectional view of the housing provided in an embodiment of the present invention; Figure 5 This is a cross-sectional view of the housing and filter element assembly after assembly according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the second end cap provided in an embodiment of the present invention; Figure 7 This is a top view of the second end cap provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the filter assembly provided in an embodiment of the present invention; Figure 9 This is a first structural schematic diagram of the filter assembly with concealed filter media provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of the central tube of one of the filter element units provided in an embodiment of the present invention; Figure 11 This is a schematic diagram of the first structure of the connecting end cap provided in an embodiment of the present invention; Figure 12 This is a schematic diagram of the second structure of the filter assembly with the filter material hidden, provided in an embodiment of the present invention. Figure 13 This is a schematic diagram of the second structure of the connecting end cap provided in an embodiment of the present invention; Figure 14 This is a schematic diagram of the structure of the central tube of another filter element unit provided in an embodiment of the present invention; Figure 15 This is a schematic diagram of the oil inlet check valve provided in an embodiment of the present invention; Figure 16 This is a cross-sectional view of the oil-water separator provided in this embodiment of the invention at the oil inlet pipe; Figure 17 This is a schematic diagram of the oil outlet check valve provided in an embodiment of the present invention; Figure 18 This is a schematic diagram of the structure of the first support frame provided in an embodiment of the present invention; Figure 19 This is a schematic diagram of the structure of the oil injection plug provided in an embodiment of the present invention; Figure 20 This is a front view of the oil filling plug provided in an embodiment of the present invention; Figure 21 yes Figure 20 BB-direction sectional view in the middle; Figure 22 yes Figure 20 CC-direction sectional view.

[0021] In the picture: 1. Outer shell; 11. Top cover; 111. Limiting platform; 112. First flange; 113. First sealing ring; 12. Housing; 121. Oil inlet pipe; 122. Oil outlet pipe; 1221. Connecting port; 1222. Limiting protrusion; 1223. Connecting pipe; 13. Water collection cup; 14. Locking ring; 15. Second plug; 2. Filter element unit; 21. Central tube; 211. Guide vane; 212a. First connecting sleeve; 212b. Second connecting sleeve; 213. Inner support rib; 214. Outer support rib; 2141. First limiting block; 2142. Second limiting block; 22. Filter media; 3. First end cap; 4. Second end cap; 41. Connecting sleeve; 411. Fourth sealing groove; 42. Limiting groove; 43. Second connecting groove; 44. Third sealing ring; 45. Fourth sealing ring; 46. Third sealing groove; 5. Connecting end cap; 51. Plate body; 52. First convex ring; 53. Second convex ring; 54. Third convex ring; 55. Connecting sleeve; 56. First connecting groove; 57. Outer plate; 58. Outer flange; 6. Oil inlet check valve; 61. First valve seat; 62. First valve core; 621. First valve core head; 622. First connecting rod; 63. First spring; 64. First support frame; 641. First support plate; 642. First support rib; 6421. First locking foot; 643. First flap; 7. Oil outlet check valve; 71. Second valve seat; 72. Second valve core; 721. Second valve core head; 722. Second connecting rod; 73. Second spring; 74. Second support frame; 741. Second support plate; 742. Second support rib; 743. Second flap; 75. Guide tube; 8. Oil filler plug; 81. Tool operating part; 82. Limiting space; 821. Limiting rib. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0024] Unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and connections within two components or interactions between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0025] Unless otherwise expressly specified and limited, "above" or "below" a 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 a 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" of a 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.

[0026] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] like Figures 1-9As shown, this embodiment provides an oil-water separator, including a housing 1 and a filter element assembly. The housing 1 has a separation chamber inside and an oil inlet and an oil outlet on its surface. The filter element assembly is coaxially disposed within the separation chamber and divides the separation chamber into radially distributed dirty oil channels and a clean oil collection chamber. The filter element assembly includes at least two filter element units 2 stacked axially. Each filter element unit 2 includes a central tube 21 and a filter media 22 arranged coaxially from the inside to the outside. A clean oil flow channel is formed inside the central tube 21, and an annular separation flow channel is formed between the central tube 21 and the inner wall of the filter media 22. A connecting unit is provided between two adjacent filter element units 2. The connecting unit is configured to allow fluid communication between the separation flow channels of adjacent filter element units 2 and to connect the clean oil flow channels of all filter element units 2 to form a clean oil collection chamber.

[0028] The oil-water separator provided in this embodiment achieves a significant increase in filtration and separation area without increasing radial installation space by configuring the filter element assembly as including at least two filter element units 2 stacked axially, thus meeting the high-flow-rate fuel treatment requirements of high-horsepower engines. Each filter element unit 2 includes a central tube 21 and filter media 22 arranged coaxially from the inside to the outside. Oil is forced to pass radially through the filter media 22, which has oleophilic and hydrophobic properties, from the outside to the inside. Water is effectively intercepted and collected in the separation channel, ensuring that each filter element unit 2 is in a highly efficient working state. With multiple filter element units 2 working simultaneously, the overall separation efficiency is greatly increased, thereby meeting the high water separation requirements under harsh conditions such as biodiesel. Integrating the filter element assembly into the separation chamber of the housing 1, the radial separation design of the dirty oil channel and the clean oil collection chamber in the separation chamber avoids short-circuiting or local dead zones of the fluid, ensuring that the fuel flow is evenly distributed among the filter element units 2. This achieves high flow rate and high separation efficiency while effectively controlling the overall flow resistance, which is beneficial to the stable operation of the engine fuel system.

[0029] In one embodiment, the filter element assembly has a first end cap 3 and a second end cap 4 at its two axial ends, respectively. The first end cap 3 abuts against the outer shell 1, and the second end cap 4 is sealed to the outer shell 1. The first end cap 3 and the second end cap 4 serve as the axial boundaries of the filter element assembly, forming a dirty oil channel together with the inner wall of the outer shell 1. Simultaneously, the second end cap 4 separates the heavily contaminated dirty oil channel from the clean oil flowing from the clean oil collection chamber to the bottom of the outer shell 1 and the water flowing from the separation channel to the bottom of the outer shell 1, preventing untreated oil or oil containing water from directly entering the bottom of the outer shell 1. The reliable sealing connection ensures that the necessary oil pressure can be formed and maintained inside the outer shell 1, driving the oil to flow along the designed path. At the same time, it prevents oil leakage from the gap between the filter element assembly and the outer shell 1, ensuring that all oil is forcibly separated through the filter media 22, thereby improving separation efficiency. The first end cap 3 and the second end cap 4 provide axial clamping force and radial positioning reference for the entire stacked filter element assembly, ensuring stable operation of the filter element assembly within the outer shell 1 and preventing displacement of internal components due to vibration or fluid impact.

[0030] In one embodiment, the outer casing 1 includes a cylindrical casing 12, an upper cover 11 connected to the top of the casing 12, and a water collection cup 13 connected to the bottom of the casing 12; a first end cap 3 abuts against the upper cover 11, and a second end cap 4 is sealed to the casing 12; an oil inlet is located on the casing 12 and near the upper cover 11, and an oil outlet is located on the casing 12 and near the water collection cup 13. The oil inlet is located on the upper part of the casing 12 near the upper cover 11. Untreated dirty oil enters the dirty oil channel from the upper part of the casing 12, and the liquid level is lower than the first end cap 3, so it will not enter the space above the first end cap 3 through the gap between the first end cap 3 and the upper cover 11. Some heavy water and large particulate pollutants can undergo preliminary sedimentation by gravity before entering the filter assembly, reducing the burden on the filter assembly. The separated liquid water has a higher specific gravity than oil, so it naturally settles downwards and collects in the water collection cup 13 at the bottom, facilitating centralized discharge. Meanwhile, the purified clean oil is drawn out from the oil outlet near the water collection cup 13 on the housing 12, maximizing the use of gravity and improving separation efficiency. The housing 1 has a split design, so when replacing the filter assembly, simply open the top cover 11 to remove it. Furthermore, the water collection cup 13 can be disassembled independently, allowing the water to be emptied without disassembling the entire filter assembly, making operation convenient.

[0031] The outer casing 1 is placed vertically, and the filter element assembly is installed vertically inside the outer casing 1. The upper cover 11 is connected to the casing 12 by a locking ring 14. The end of the upper cover 11 connected to the casing 12 is provided with a first flange 112. A first sealing groove is provided below the first flange 112, and a first sealing ring 113 is provided in the first sealing groove. The locking ring 14 is threadedly connected to the casing 12, and the upper end of the locking ring 14 is engaged with the first flange 112 to press the first sealing ring 113 tightly, thereby ensuring the sealing at the connection between the upper cover 11 and the casing 12. A limiting platform 111 is provided at the top of the inner wall of the upper cover 11. The first end cover 3 abuts against the limiting platform 111 to achieve the upper limit of the filter element assembly. The end of the water collecting cup 13 connected to the housing 12 has a second flange, a second sealing groove, and a second sealing ring. After the housing 12 and the water collecting cup 13 are threaded together, the lower end of the housing 12 abuts against the second flange and presses the second sealing ring tightly, ensuring the sealing of the connection between the housing 12 and the water collecting cup 13. The outer peripheral wall of the second end cover 4 has a third sealing groove 46, and a third sealing ring 44 is provided in the third sealing groove 46. The third sealing ring 44 fits tightly against the inner wall of the housing 12, thereby ensuring the sealing of the dirty oil passage.

[0032] In one embodiment, the second end cap 4 has a downwardly extending connecting sleeve 41 at its center; the housing 12 has an oil outlet pipe 122, one end of which forms an oil outlet, and the middle side wall of the oil outlet pipe 122 has a connecting port 1221 that communicates with the clean oil collection chamber; the bottom end of the connecting sleeve 41 is inserted into the connecting port 1221 and sealed to the oil outlet pipe 122. All the clean oil separated from the filter element units 2 eventually collects in the clean oil collection chamber and enters the oil outlet pipe 122 under the guidance of the connecting sleeve 41. This vertical flow path avoids the clean oil from generating eddies, reduces flow resistance, and is beneficial for meeting high flow rate requirements.

[0033] Specifically, such as Figure 1 , Figure 3 , Figure 4 and Figure 16 As shown, the oil outlet pipe 122 extends radially from both ends inside the housing 12 to the outside of the housing 12, with one end forming an oil outlet and the other end being sealed by a first plug.

[0034] An oil inlet pipe 121 is provided on the upper part of the housing 12. The oil inlet pipe 121 is located outside the housing 12, and the middle part of the oil inlet pipe 121 is connected to the inner cavity of the housing 12. One end of the oil inlet pipe 121 forms an oil inlet, and the other end is sealed by a second plug 15. The oil inlet pipe 121 does not occupy the internal space of the housing 12, providing clearance for the installation of the filter element assembly.

[0035] Both the oil outlet pipe 122 and the oil inlet pipe 121 are integrally molded with the shell 12, which reduces the processing difficulty and thus reduces the manufacturing cost.

[0036] Continue to refer to Figures 3-7 The middle sidewall of the oil outlet pipe 122 extends upward from the connecting port 1221 to form a connecting pipe 1223. The connecting sleeve 41 is inserted into the connecting pipe 1223. The outer peripheral wall of the connecting sleeve 41 is provided with a fourth sealing groove 411. The fourth sealing groove 411 is provided with a fourth sealing ring 45. After the connecting sleeve 41 is inserted into the connecting pipe 1223, the fourth sealing ring 45 fits tightly with the inner wall of the connecting pipe 1223 to ensure the sealing of the connection between the connecting pipe 1223 and the connecting sleeve 41 and prevent clean oil leakage.

[0037] Because the filter element assembly has a long axial length, in order to facilitate the installation and positioning of the filter element assembly and the housing 12 when installing the filter element assembly in the housing 12, in one embodiment, the center line of the connecting port 1221 is eccentrically set with the center line of the housing 12. Since the center line of the filter element assembly coincides with the center line of the housing 12, the center line of the second end cap 4 at the lower end of the filter element assembly is eccentrically set with the center line of the connecting port 1221, that is, the center line of the connecting pipe 1223 is eccentrically set with the center line of the connecting sleeve 41.

[0038] Two limiting protrusions 1222 are provided on the outer periphery of the connecting port 1221, and two limiting grooves 42 are provided on the second end cover 4 respectively. The distance between the two limiting protrusions 1222 and the center line of the connecting port 1221 is not equal. The two limiting protrusions 1222 and the two limiting grooves 42 are matched one-to-one to limit the installation position of the filter element assembly in the circumferential direction, forming an anti-misinstallation structure. An axial limiting step is formed between the connecting port 1221 and the limiting protrusions 1222 to limit the axial movement of the filter element assembly.

[0039] The filter element has a relatively long overall length. During the installation of the housing 12, the operator's line of sight is easily obstructed, making it difficult to simultaneously observe the alignment of the connecting sleeve 41 and the connecting tube 1223 of the second end cap 4. By setting the center line of the connecting tube 1223 off-center from the center line of the connecting sleeve 41, the outer diameter of the connecting sleeve 41 is smaller than the inner diameter of the connecting tube 1223, and the off-center distance between the two does not affect the insertion of the connecting sleeve 41 into the connecting tube 1223.

[0040] Two limiting protrusions 1222 are provided on the outer periphery of the connecting port 1221, i.e., the upper outer periphery of the connecting pipe 1223. This allows the installer to simply insert the front rotating filter assembly until the limiting protrusions 1222 enter the limiting groove 42, ensuring automatic alignment between the connecting sleeve 41 and the connecting pipe 1223. The centerline of the connecting pipe 1223 is eccentrically set with the centerline of the connecting sleeve 41, and the distance between the two limiting protrusions 1222 and the centerline of the connecting port 1221 is unequal, preventing the filter assembly from being installed 180° in reverse, forming an anti-misinstallation structure. The second end cap 4 of the filter assembly abuts against the axial limiting step, restricting the filter assembly from moving downward along the axial direction. The axial limiting step and the limiting platform 111 in the upper cover 11 together restrict the axial displacement of the filter assembly, thereby preventing the filter assembly from moving up and down under fluid impact.

[0041] like Figures 7-14 As shown, in one embodiment, the central tube 21 includes a hydrophobic mesh cylinder and a guide plate 211 spirally wound around the outer wall of the hydrophobic mesh cylinder, and a separation flow channel is formed between the guide plate 211 and the inner wall of the filter material 22.

[0042] A second connecting groove 43 is also provided on the second end cap 4. The second connecting groove 43 and the limiting groove 42 are both located on the outer periphery of the connecting sleeve 41. Two sets of the second connecting groove 43 are arranged opposite each other, and the second connecting groove 43 and the limiting groove 42 are staggered. The second connecting groove 43 is used to connect the separation channel and the water collection cup 13. The guide plate 211 is located between the inner frame and the outer frame and is made of metal or plastic. The guide plate 211 is spirally wound and fixed on the central tube 21. The guide plate 211 and the hydrophobic mesh cylinder form a continuous guide channel with a downward tilt angle. The spiral tilt angle of the guide plate 211 generates a downward component force, driving the water flow to make a spiral downward acceleration motion, so that the water flow quickly reaches the bottom of the separation channel and enters the water collection cup 13 through the second connecting groove 43 for collection, avoiding water droplets from accumulating on the surface of the hydrophobic mesh to form a large liquid film and affecting the oil permeability.

[0043] Specifically, the filter material 22 is a pleated structure formed by folding filter paper. The pleated structure surrounds the outer periphery of the central tube 21 and extends along the axial direction of the central tube 21. It is used to filter impurities in the fuel and separate large water particles from the fuel. Small water particles that cannot be separated by the filter material 22 condense into large water particles when passing through the innermost water-collecting layer of the filter material 22. The large water particles are intercepted by the hydrophobic net and remain in the separation channel.

[0044] The hydrophobic mesh cylinder consists of an inner frame and a hydrophobic mesh laid on the outer periphery of the inner frame. The inner frame is composed of four inner support ribs 213 evenly distributed along the circumference. The four inner support ribs 213 together form a circular axial through hole, which constitutes the support skeleton of the clean oil flow channel, ensuring that the clean oil flow channel does not deform under pressure. The clean oil separated by the filter material 22 flows through the hydrophobic mesh to the clean oil flow channel.

[0045] The central tube 21 also includes an outer frame, with guide vanes 211 connected between the inner and outer frames, capable of resisting the wrapping pressure of the external filter media 22 and fluid impact. At the same time, while ensuring strength, it reduces the obstruction of the effective area of ​​the hydrophobic mesh by the structure, ensuring that the oil-water mixture can fully contact the filter media 22, and that clean oil can smoothly pass through the hydrophobic mesh into the clean oil flow channel.

[0046] In one embodiment, the connecting unit is a connecting end cap 5 disposed between two adjacent filter cartridge units 2. Integrating the connecting function into the compact connecting end cap 5 replaces complex external pipelines or internal chambers, allowing multiple filter cartridge units to maintain high space utilization even when axially stacked, thus achieving a highly compact structure.

[0047] For example, the filter assembly includes two filter units 2, namely a first filter unit and a second filter unit. The top of the first filter unit is connected to a first end cap 3, the bottom of the first filter unit and the top of the second filter unit are connected through a connecting end cap 5, and the bottom of the second filter unit is connected to a second end cap 4.

[0048] The inner frame is fixedly connected to two connecting sleeves at both ends. These two connecting sleeves are used to connect with the adjacent connecting end cap 5, the first end cap 3 or the second end cap 4. The specific design can be adapted according to the actual connection object. The structure of the two connecting sleeves can be the same or different.

[0049] The outer frame consists of two symmetrically arranged circumferential outer support ribs 214 located on the outer sides of the two connecting sleeves. Further, the two symmetrical outer support ribs 214 divide the space into two approximately equal regions circumferentially. Within each region, a set of guide vanes 211 is independently arranged, with the two sets of guide vanes 211 having opposite spiral directions. For example, one set is left-handed, and the other is right-handed. Multiple guide vanes 211 are spaced apart in each set. When the filter assembly is installed vertically, the two sets of guide vanes 211 with opposite spiral directions can break up any large vortices that might form in a single direction, resulting in a more uniform fluid distribution along the height of the filter media 22. This avoids excessively high or low local flow velocities, ensuring that the filter media 22 in all areas is fully utilized, thus extending the service life of the filter assembly.

[0050] To meet the filtration requirements of high flow rates, filter element 2 can also be set in two, three, or four or more quantities, depending on the actual flow rate.

[0051] In one embodiment, the connecting end cap 5 includes a plate 51, a first protruding ring 52, a second protruding ring 53, a third protruding ring 54, and at least one connecting sleeve 55. The two side surfaces of the plate 51 are respectively connected to the end faces of two adjacent filter element units 2. The first protruding ring 52 and the second protruding ring 53 protrude coaxially from the two side surfaces of the plate 51 and are respectively sealed and inserted into the central tube 21 of the two adjacent filter element units 2. The inner holes of the first protruding ring 52 and the second protruding ring 53 communicate to form a clean oil communication channel. The third protruding ring 54 protrudes from one side surface of the plate 51 and surrounds the outside of the first protruding ring 52. At least one first connecting groove 56 is formed between the third protruding ring 54 and the first protruding ring 52. At least one connecting sleeve 55 protrudes from the other side surface of the plate 51 and is spaced apart from the second protruding ring 53. The inner hole of the connecting sleeve 55 communicates with the first connecting groove 56, together forming an oil-water communication channel.

[0052] The central tube 21 of the first filter element unit is the first central tube, and the central tube 21 of the second filter element unit is the second central tube. The first convex ring 52 is sealed to the first central tube, and the second convex ring 53 is sealed to the second central tube. The sealing connection between the first convex ring 52 and the first central tube, and between the second convex ring 53 and the second central tube, can be achieved by adhesive sealing or by setting a sealing element at the connection position to ensure sealing.

[0053] In one embodiment, the inner diameter of the first convex ring 52 is larger than the inner diameter of the second convex ring 53, making the clean oil flow channel have a stepped hole structure. The end of the first central tube is provided with a first connecting sleeve 212a. The large hole wall and the stepped surface of the stepped hole are respectively glued and sealed to the outer wall and the bottom end of the first connecting sleeve 212a. The outer periphery of the first connecting sleeve 212a is provided with a fifth sealing groove, and a fifth sealing ring is provided in the fifth sealing groove. The large hole wall and the stepped surface of the stepped hole are coated with glue. The first connecting sleeve 212a is fitted inside the first convex ring 52. The outer wall and the bottom end of the first connecting sleeve 212a are respectively glued and fixed to the large hole wall and the stepped surface. The fifth sealing ring is squeezed between the large hole wall and the fifth sealing groove, ensuring the sealing between the first connecting sleeve 212a and the first convex ring 52. The bottom end of the first connecting sleeve 212a contacts the stepped surface to form a pressure-bearing stop surface. When the filter element assembly is subjected to clean oil pressure or external axial force, the pressure-bearing stop surface can bear most of the pressure load, effectively reducing the shear stress burden of the adhesive layer and making the connection more stable and reliable.

[0054] The end of the second central tube is provided with a second connecting sleeve 212b. The outer wall of the second convex ring 53 and the corresponding side end face of the plate 51 are respectively glued and sealed to the inner wall and top end of the second connecting sleeve 212b. The adhesive sealing and structural fixation increase the sealing area, resulting in not only a good sealing effect but also better torsional and bending resistance.

[0055] For example, multiple first connecting grooves 56 and connecting sleeves 55 are provided one-to-one, together forming an oil-water connecting channel. The first connecting grooves 56 and connecting sleeves 55 are integrally formed with the plate body 51. After assembly, the first connecting grooves 56 and connecting sleeves 55 connect the separation channels of the first filter element unit and the second filter element unit. The oil-water connecting channel is located outside the clean oil connecting channel, and the two are completely isolated from each other. Even under high pressure fluctuations, the two fluids can only flow in their respective sealed independent channels, avoiding the problem of cross-contamination.

[0056] The end faces of the first convex ring 52 and the third convex ring 54 are flush. A first limiting block 2141 is provided at the bottom of the two outer support ribs 214 of the first central tube. The end faces of the second convex ring 53 and the connecting sleeve 55 are flush. A second limiting block 2142 is provided at the top of the two outer support ribs 214 of the second central tube. After the first filter element unit and the second filter element unit are connected through the connecting end cap 5, the first limiting block 2141 abuts against the end faces of the first convex ring 52 and the third convex ring 54, and the second limiting block 2142 abuts against the end faces of the second convex ring 53 and the connecting sleeve 55. Before the adhesive cures, the abutment between the limiting blocks and the flush end faces provides a stable positioning for the filter element unit 2. Simultaneously, it can resist bending moments and torsional loads generated during handling, installation, or impact from internal fluids, preventing excessive relative displacement or deflection between the filter element units 2, and ensuring the centering and stability of the filter element assembly within the housing 12.

[0057] In one embodiment, the connecting end cap 5 further includes an outer peripheral plate 57 surrounding the outer periphery of the plate body 51, with both sides of the outer peripheral plate 57 protruding from the corresponding sides of the plate body 51. The outer peripheral plate 57 serves to protect the internal oil-water and clean oil connecting channels from damage. Any accidental bumps or friction from the side will be absorbed by the outer peripheral plate 57, thereby protecting the inner first protruding ring 52, second protruding ring 53, third protruding ring 54, and connecting sleeve 55, reducing the risk of leakage due to assembly damage.

[0058] In one embodiment, the outer peripheral wall of the outer plate 57 is provided with a radially outwardly extending outer flange 58. The outer flange 58 structure is equivalent to adding a "flange edge" to the outer edge of the outer plate 57, increasing the section modulus and bending stiffness of the edge region of the outer plate 57. When the housing 12 applies a large axial clamping force to the filter element unit 2, the outer plate 57 with the outer flange 58 can effectively convert the concentrated load into a uniformly distributed load and transmit it more stably to the plate 51 and the filter element unit 2, preventing the outer plate 57 itself from collapsing or deforming under high pressure, thereby better protecting the oil-water communication channel and the clean oil communication channel from damage.

[0059] The filter assembly provided in this embodiment uses a connecting end cap 5 to stack multiple filter units 2 axially. Adjacent filter units 2 are sealed together by a first connecting sleeve 212a at the bottom of the central tube 21 of one filter unit 2, which is connected to the inner wall of the first protruding ring 52 of the connecting end cap 5 and the stepped surface formed between the first protruding ring 52 and the plate 51. The second connecting sleeve 212b at the top of the central tube 21 of the other filter unit 2 is connected to the second protruding ring 53 by a sleeve and adhesive bonding. Repeating this process allows for the axial stacking of multiple filter units 2 and the connecting end cap 5 as needed. A first limiting block 2141 abuts against the flush-set end faces of the first protruding ring 52 and the third protruding ring 54, and a second limiting block 2142 abuts against the flush-set end faces of the second protruding ring 53 and the connecting sleeve 55, providing precise axial positioning and bearing capacity. The first end cap 3 and the second end cap 4 are installed on both ends of the filter element assembly stacked along the axial direction, and then the assembly is installed as a whole into the housing 12. The first end cap 3 abuts against the upper cover 11, and the second end cap 4 is sealed to the housing 12, thereby achieving a seal between the housing 12 and the filter element assembly. A dirty oil channel is formed between the outer wall of the filter element assembly and the inner wall of the housing 12.

[0060] When the filter assembly is working, fuel enters the dirty oil channel from the oil inlet on the housing 12. Under pressure, the fuel passes through the filter media 22 of each filter element unit 2, filtering out impurities and separating large water particles from the fuel. Small water particles that cannot be separated by the filter media 22 condense into large water particles when passing through the innermost water-gathering layer of the filter media 22 and remain in the separation channel. The hydrophobic mesh intercepts the large water particles gathered by the filter media 22. The clean oil that passes through the filter media 22 enters the clean oil channel through the hydrophobic mesh. The guide plate 211 guides the water in the separation channel to move downwards in an accelerated rotation. After passing through the oil-water connecting channel between adjacent filter element units 2, it finally collects in the water collection cup 13 at the bottom of the housing 12. The clean oil in the clean oil channel passes through the clean oil connecting channel between adjacent filter element units 2 and is finally discharged from the oil outlet of the housing 12.

[0061] After a period of use, the filter element assembly of the oil-water separator needs to be replaced with a new one. During disassembly and assembly, loosen and remove the locking ring 14 that secures the upper cover 11 to the housing 12, and open the upper cover 11. Then, simply pull the filter element assembly upwards to remove it from the housing 12. Next, insert the new filter element assembly axially into the housing 12, aligning its bottom connecting sleeve 41 with and inserting it into the connecting port 1221 on the side wall of the oil outlet pipe 122 inside the housing 12. Then, rotate the filter element assembly circumferentially so that the two unequally spaced limiting protrusions 1222 on the oil outlet pipe 122 respectively engage with the corresponding limiting grooves 42 on the bottom surface of the second end cover 4. When the bottom surface of the second end cover 4 abuts against the axial limiting step above the limiting protrusions 1222, it indicates that the filter element assembly has been rotated to the correct position and axially installed. Close the upper cover 11 and re-lock it to the housing 12 using the locking ring 14 to complete the replacement.

[0062] It should be noted that in the overall vehicle layout of this top-mounted structure, if the fuel-water separator is installed higher than the fuel tank, fuel in the fuel-water separator and upstream pipeline may siphon back to the fuel tank under gravity after the engine is turned off. This can cause air to enter the fuel system, creating "air lock," which may result in insufficient fuel supply, difficulty starting, or unstable operation after starting the engine.

[0063] To solve the above technical problems, such as Figures 15-18 As shown, the oil inlet is equipped with an inlet check valve 6 that only allows oil to flow into the dirty oil passage; the oil outlet is equipped with an outlet check valve 7 that only allows oil to flow out of the clean oil collection chamber. When the engine is turned off and the fuel pump stops working, the inlet check valve 6 at the oil inlet closes, cutting off the path from the oil-water separator back to the fuel tank. At the same time, the outlet check valve 7 at the oil outlet also closes automatically, preventing fuel in the clean oil collection chamber and the outlet pipe 122 from flowing back into the oil-water separator or being sucked back into the air. Fuel cannot be siphoned back to the lower fuel tank under the action of gravity, thus ensuring that the oil-water separator and the inlet pipe 121 are always full of oil after the engine is stopped, eliminating the "air resistance" problem that requires a long time of pumping oil and venting air when restarting due to the oil circuit being emptied.

[0064] In one embodiment, the inlet check valve 6 includes a first valve seat 61, a first valve core 62, and a first spring 63. The first valve seat 61 is fixed inside the inlet pipe 121 connected to the inlet port, and the first valve core 62 is axially movable inside the first valve seat 61. The first spring 63 can apply a sealing force to the first valve core 62. The outlet check valve 7 includes a second valve seat 71, a second valve core 72, and a second spring 73. The second valve seat 71 is fixed inside the outlet pipe 122 connected to the outlet port, and the valve core is axially movable inside the second valve seat 71. The second spring 73 can apply a sealing force to the second valve core 72. The spring preload provided by the first spring 63 and the second spring 73 is a constant preset sealing force. As long as the reverse pressure is lower than this preset sealing force, the valve can remain closed, effectively preventing fuel siphon backflow under any pressure difference. Under the continuous spring pressure, the valve core can make slight axial compensation, continue to maintain tight contact, thereby extending its service life and maintaining long-term anti-backflow performance.

[0065] In one embodiment, the inlet check valve 6 further includes a first support frame 64, a first valve core 62 disposed within the first support frame 64, and one end of the first spring 63 abutting against the first support frame 64 and the other end abutting against the first valve core 62; the outlet check valve 7 further includes a second support frame 74, a second valve core 72 disposed outside the second support frame 74, and one end of the second spring 73 abutting against the second support frame 74 and the other end abutting against the second valve core 72.

[0066] Specifically, the first support frame 64 includes a first support plate 641 and first support ribs 642 perpendicularly connected to the first support plate 641. The first support ribs 642 are spaced apart circumferentially along the first support plate 641. One end of the first spring 63 abuts against the first support plate 641, and the first support ribs 642 are engaged with the first valve seat 61. The second support frame 74 includes a second support plate 741 and second support ribs 742 perpendicularly connected to the second support plate 741. The second support ribs 742 are spaced apart circumferentially along the second support plate 741. One end of the second spring 73 abuts against the second support plate 741, and the second support ribs 742 are engaged with the second valve seat 71.

[0067] The first support frame 64 provides a flat, rigid support surface for the first spring 63 and the second support frame 74 provides a support surface for the second spring 73, ensuring that the compression and reset of the first spring 63 and the second spring 73 always proceed along the preset axis. The spring force of the first spring 63 and the second spring 73 can be accurately transmitted to the first valve core 62 and the second valve core 72, avoiding bending, jamming, or abnormal stress of the springs due to uneven end contact, thereby ensuring the stability and repeatability of the valve opening or closing action.

[0068] Specifically, the first support plate 641 has a first guide hole in the middle, and the second support plate 741 has a second guide hole in the middle.

[0069] The first valve core 62 includes a first connecting rod 622 and a first valve core head 621 located at one end of the first connecting rod 622. A first spring 63 is sleeved on the first connecting rod 622, with one end of the first spring 63 connected to the first support plate 641 and the other end connected to the first valve core head 621. The other end of the first connecting rod 622 passes through a first guide hole. A first valve is provided inside the first valve seat 61. The first valve core head 621 closes the first valve under the elastic force of the first spring 63. When fuel enters the first valve seat 61 through the fuel inlet, the first valve core head 621 compresses the first spring 63 under the action of fuel pressure, thereby opening the first valve and allowing fuel to enter the dirty oil passage through the fuel inlet pipe 121.

[0070] The second valve core 72 includes a second connecting rod 722 and a second valve core head 721 located at one end of the second connecting rod 722. A second spring 73 is sleeved on the second connecting rod 722, with one end connected to the second support plate 741 and the other end connected to the second valve core head 721. The other end of the second connecting rod 722 passes through a second guide hole. A second valve is provided inside the oil outlet pipe 122. The second valve core head 721 closes the second valve under the elastic force of the second spring 73. When clean oil enters the oil outlet pipe 122 through the connecting port 1221 and acts on the second valve core head 721, it drives the second valve core head 721 to compress the second spring 73, thereby opening the second valve and allowing clean oil to flow out from the oil outlet pipe 122 through the oil outlet check valve 7 and the oil outlet. Furthermore, a guide tube 75 is connected inside the second guide hole, providing guidance for the movement of the second connecting rod 722.

[0071] The end of the first support rib 642 away from the first support plate 641 is bent inward to form a first locking foot 6421. The first valve seat 61 is provided with a first locking position. The first locking foot 6421 and the first locking position are engaged to lock the first support frame 64 onto the first valve seat 61.

[0072] The end of the second support rib 742 away from the second support plate 741 is bent inward to form a second locking foot. The second valve seat 71 is provided with a second locking position. The second locking foot and the second locking position are engaged to lock the second support frame 74 onto the second valve seat 71.

[0073] In one embodiment, a first flap 643 is vertically connected to the outer side of the first support rib 642. The first flap 643 cooperates with the inner wall of the oil inlet pipe 121 connected to the oil inlet, forming an oil inlet channel between adjacent first flaps 643. A second flap 743 is vertically connected to the outer side of the second support rib 742. The second flap 743 cooperates with the inner wall of the oil outlet pipe 122 connected to the oil outlet, forming an oil outlet channel between adjacent second flaps 743. The arrangement of the first flap 643 and the second flap 743 serves two purposes: firstly, by cooperating with the inner walls of the oil inlet pipe 121 and the oil outlet pipe 122, it ensures a stable connection between the first support frame 64 and the first valve seat 61, and between the second support frame 74 and the second valve seat 71; secondly, the formed oil inlet and oil outlet channels reduce fluid flow resistance.

[0074] In one embodiment, such as Figure 2 , Figures 19-22 As shown, the top of the outer casing 1 is provided with an oil filling hole, which is sealed by an oil filling plug 8. The oil filling hole is located on the top of the upper cover 11 and is mainly used to pre-inject sufficient fuel into the separation chamber after the filter assembly is replaced, so as to purge air and ensure that the oil-water separator and upstream pipeline are full before the engine is started.

[0075] To facilitate the application of force to install and remove the oil filler plug 8, a tool operating part 81 is provided on the top of the oil filler plug 8. A limiting space 82 is formed inside the tool operating part 81 for use with a special installation and removal tool. The height of the limiting space 82 is slightly greater than the thickness of the special installation and removal tool, so that the special installation and removal tool can be inserted into the limiting space 82.

[0076] Specifically, the tool operating part 81 is provided with multiple radially extending limiting ribs 821. The multiple limiting ribs 821 divide the limiting space 82 into multiple slots for cooperating with special disassembly and assembly tools, so as to achieve efficient torque transmission.

[0077] The above description is only a preferred embodiment of the present invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present invention. The content of this specification should not be construed as a limitation of the present invention.

Claims

1. An oil-water separator, characterized in that, include: The outer casing (1) has a separation chamber inside, and the outer casing (1) has an oil inlet and an oil outlet; The filter element assembly is coaxially disposed within the separation chamber and divides the separation chamber into radially distributed dirty oil channels and a clean oil collection chamber; the filter element assembly includes at least two filter element units (2) stacked axially; Each filter element unit (2) includes a central tube (21) and a filter material (22) arranged coaxially from the inside to the outside. A clean oil flow channel is formed inside the central tube (21), and an annular separation flow channel is formed between the central tube (21) and the inner wall of the filter material (22). A connecting unit is provided between two adjacent filter element units (2), and the connecting unit is configured to connect the separation flow channels of the adjacent filter element units (2) and connect the clean oil flow channels of all filter element units (2) to form the clean oil collection cavity.

2. The oil-water separator according to claim 1, characterized in that, The filter assembly has a first end cap (3) and a second end cap (4) at its two axial ends respectively. The first end cap (3) abuts against the outer shell (1), and the second end cap (4) is sealed to the outer shell (1). The connecting unit is a connecting end cap (5) disposed between two adjacent filter element units (2).

3. The oil-water separator according to claim 2, characterized in that, The central tube (21) includes a hydrophobic mesh cylinder and a guide plate (211) spirally wound around the outer wall of the hydrophobic mesh cylinder, and the guide plate (211) and the inner wall of the filter material (22) form the separation channel.

4. The oil-water separator according to claim 2 or 3, characterized in that, The connecting end cap (5) includes: The plate (51) has two side surfaces that are respectively connected to the end faces of two adjacent filter elements (2); The first protruding ring (52) and the second protruding ring (53) protrude coaxially from the two side surfaces of the plate (51) respectively, and are respectively sealed and inserted into the central tube (21) of the two adjacent filter element units (2). The inner holes of the first protruding ring (52) and the second protruding ring (53) are connected to form a clean oil communication channel. The third protruding ring (54) protrudes from one side surface of the plate (51) and surrounds the outside of the first protruding ring (52). At least one first connecting groove (56) is formed between the third protruding ring (54) and the first protruding ring (52). At least one connecting sleeve (55) protrudes from the other side surface of the plate (51) and is spaced apart from the second convex ring (53); the inner hole of the connecting sleeve (55) is connected to the first connecting groove (56) to form an oil-water connecting channel.

5. The oil-water separator according to claim 2, characterized in that, The outer shell (1) includes a cylindrical shell (12), a top cover (11) connected to the top of the shell (12), and a water collection cup (13) connected to the bottom of the shell (12); The first end cap (3) abuts against the upper cover (11), and the second end cap (4) is sealed to the housing (12); The oil inlet is located on the housing (12) and near the top cover (11), and the oil outlet is located on the housing (12) and near the water collection cup (13).

6. The oil-water separator according to claim 5, characterized in that, The second end cap (4) has a downwardly extending connecting sleeve (41) at its center; The housing (12) is provided with an oil outlet pipe (122), one end of which forms the oil outlet, and the middle side wall of the oil outlet pipe (122) is provided with a communication port (1221) that communicates with the clean oil collection chamber. The bottom end of the connecting sleeve (41) is inserted into the connecting port (1221) and sealed to the oil outlet pipe (122).

7. The oil-water separator according to claim 6, characterized in that, The centerline of the communication port (1221) is offset from the centerline of the housing (12); Two limiting protrusions (1222) are provided on the outer periphery of the connecting port (1221), and two limiting grooves (42) are provided on the second end cover (4) respectively. The distance between the two limiting protrusions (1222) and the center line of the connecting port (1221) is not equal. The two limiting protrusions (1222) and the two limiting grooves (42) are matched one-to-one to limit the installation position of the filter assembly in the circumferential direction and form an anti-misinstallation structure. An axial limiting step is formed between the connecting port (1221) and the limiting protrusion (1222) to restrict the axial movement of the filter assembly.

8. The oil-water separator according to claim 1, characterized in that, The oil inlet is equipped with an oil inlet check valve (6) that only allows oil to flow into the dirty oil channel; The oil outlet is equipped with an oil outlet check valve (7) that only allows oil to flow out of the clean oil collection chamber.

9. The oil-water separator according to claim 8, characterized in that, The oil inlet check valve (6) includes a first valve seat (61), a first valve core (62), and a first spring (63). The first valve seat (61) is fixed inside the oil inlet pipe (121) connected to the oil inlet. The first valve core (62) is axially movable inside the first valve seat (61). The first spring (63) can apply a sealing force to the first valve core (62). The oil outlet check valve (7) includes a second valve seat (71), a second valve core (72), and a second spring (73). The second valve seat (71) is fixed inside the oil outlet pipe (122) connected to the oil outlet. The second valve core (72) is axially movable inside the second valve seat (71). The second spring (73) can apply a sealing force to the second valve core (72).

10. The oil-water separator according to claim 9, characterized in that, The oil inlet check valve (6) also includes a first support frame (64), the first valve core (62) is disposed in the first support frame (64), one end of the first spring (63) abuts against the first support frame (64), and the other end abuts against the first valve core (62); The oil outlet check valve (7) also includes a second support frame (74), the second valve core (72) is located outside the second support frame (74), one end of the second spring (73) abuts against the second support frame (74), and the other end abuts against the second valve core (72).

11. The oil-water separator according to claim 10, characterized in that, The first support frame (64) includes a first support plate (641) and a first support rib (642) perpendicularly connected to the first support plate (641). The first support rib (642) is spaced apart along the circumference of the first support plate (641). One end of the first spring (63) abuts against the first support plate (641). The first support rib (642) is engaged with the first valve seat (61). The second support frame (74) includes a second support plate (741) and a second support rib (742) perpendicularly connected to the second support plate (741). The second support rib (742) is spaced apart along the circumference of the second support plate (741). One end of the second spring (73) abuts against the second support plate (741). The second support rib (742) is engaged with the second valve seat (71).

12. The oil-water separator according to claim 11, characterized in that, The first support rib (642) is vertically connected to the outer side of the first flap (643), and the first flap (643) and the inner wall of the oil inlet pipe (121) connected to the oil inlet cooperate to form an oil inlet channel between adjacent first flaps (643); The second support rib (742) is vertically connected to a second flap (743), and the second flap (743) and the inner wall of the oil outlet pipe (122) connected to the oil outlet cooperate to form an oil outlet channel between adjacent second flaps (743).

13. The oil-water separator according to claim 1, characterized in that, The top of the outer casing (1) is provided with an oil injection hole, which is sealed by an oil injection plug (8); The top of the oil filler plug (8) is provided with a tool operating part (81), and a limiting space (82) is formed in the tool operating part (81) for use with a special disassembly and assembly tool.

14. The oil-water separator according to claim 13, characterized in that, The tool operating part (81) is provided with multiple radially extending limiting ribs (821), and the multiple limiting ribs (821) divide the limiting space (82) into multiple slots for cooperating with the special disassembly and assembly tool.

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