Oil-water separation filter element and filter

Abstract

The oil-water separation filter element comprises an annular filter medium, a first end cover, a second end cover and a central framework, the first end cover and the second end cover are connected to the two ends of the annular filter medium, and the annular filter medium is provided with a central cavity arranged around the central axis of the annular filter medium; the first end cover is provided with a first conduit part of a water discharge conduit; the central framework is arranged in the central cavity, and the central framework is provided with a second guide pipe part of a water discharge guide pipe; one end of the third conduit part is communicated with the second conduit part on the central skeleton, and the other end of the third conduit part extends out of the central cavity. According to the technical scheme, one part of the water discharging guide pipe is arranged on the central framework in the central cavity of the annular filtering medium, so that the situation that the installation volume of the filter element in the filter is occupied by the part of the external guide pipe is avoided, the capacity of arranging more filtering media in the filter is improved, and the filtering efficiency of the filter is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to filter technology field especially relates to an oil -water separation filter core and filter. BACKGROUND

[0002] The water and particulate impurities in fuel are extremely harmful to the fuel supply system of the internal combustion engine: the presence of water can cause poor lubrication, causing wear and corrosion of the fuel injection nozzle and high-pressure pump; particulate impurities (such as dust, metal powder, etc.) can accelerate the wear of the high-pressure pump and cause the fuel injection nozzle to be blocked.

[0003] In the fuel supply system, a fuel filter with oil-water separation function is generally provided to clean the fuel and remove water and particulate impurities in the fuel. With the progress of technology, the development of internal combustion engines towards high efficiency and energy saving requires the filter to meet the lightweight design and have higher filtration performance and service life.

[0004] Most of the current fuel filters use cylindrical filters for filtration. When a particulate filter is arranged in a tubular housing and also includes a water separator, the particulate filter and the water separator are usually arranged concentrically in the center part of the tubular housing relative to the filter medium. The particulate filter and the water separator reduce particulate matter and water in the fuel before the fuel is delivered to the engine. However, the filter medium and the water separator of this structure cannot separate enough water in the limited space, and it is not enough to meet the requirements of modern engines for the can-shaped filter assembly.

[0005] In the prior art, Chinese patent (publication number 104768626 B) discloses a tubular filter wall, a first support plate fixed at the end of the filter wall, and a second support plate fixed at the opposite end of the filter wall, each support plate defining a respective portion of a water discharge conduit from which water is separated from fuel during fuel filtration. It also includes a connecting sleeve that can be connected to the portion and is arranged outside the filter wall.

[0006] However, due to insufficient design of the structure of the filter assembly, although the above structure facilitates the collection of water in the filter set and the effective, simple and repeatable positioning of the discharge element, the external connecting sleeve increases the installation volume of the filter element in the filter, thereby reducing the ability to set more filter medium in the filter. UTILITY MODEL CONTENTS

[0007] The main purpose of the utility model is to provide an oil-water separation filter core and filter, which aims to solve the technical problem that the external connecting sleeve currently increases the installation volume of the filter element in the filter, and reduces the ability to set more filter medium in the filter.

[0008] To achieve the above purpose, the oil-water separation filter core provided by the utility model comprises:

[0009] a ring-shaped filter medium having a central cavity defined about a central axis thereof;

[0010] a first end cover and a second end cover connected to two ends of the ring-shaped filter medium, the first end cover being provided with a first conduit portion of the water discharge conduit;

[0011] a central skeleton provided in the central cavity and coaxially arranged, the central skeleton being provided with a second conduit portion of the water discharge conduit; and

[0012] a third conduit portion in communication with the second conduit portion on the central skeleton and extending out of the central cavity.

[0013] Optionally, the first conduit portion and the first end cover are integrally formed.

[0014] Optionally, the second conduit portion and the central skeleton are integrally formed.

[0015] Optionally, the first conduit portion and the second conduit portion are tightly fitted at the connection therebetween.

[0016] Optionally, the central skeleton is circumferentially provided with a plurality of rib plates spirally ascending, and openings for fuel to pass through are formed between the rib plates.

[0017] Optionally, further comprising a water-blocking mesh, the water-blocking mesh being annular and coaxially located in the central cavity.

[0018] Optionally, the water-blocking mesh is fixed to the central skeleton for intercepting water in fuel flowing radially inward through the openings.

[0019] Optionally, the first conduit portion comprises a transverse portion perpendicular to the axial direction of the ring-shaped filter medium, and a vertical portion parallel to the axial direction of the ring-shaped filter medium.

[0020] The utility model further provides a filter, which comprises:

[0021] an oil-water separation filter element, which is the oil-water separation filter element described above;

[0022] a housing having a first passage for fuel to be filtered to enter, a second passage for filtered fuel to flow out, and a third passage for separated water to be discharged; the oil-water separation filter element divides the internal volume of the housing into a contaminated cavity in communication with the first passage and a clean cavity in communication with the second passage, and at least one conduit portion of the water discharge conduit is connected to the third passage.

[0023] Optionally, the oil-water separation filter core is provided with a sealing element for sealing connection with the inner wall of the shell to separate the dirty cavity from the clean cavity.

[0024] Optionally, the second end cover is provided with a second through hole in the center for communication between the central cavity and the bottom of the shell, and the third conduit part extends to the bottom of the shell.

[0025] Optionally, the second end cover and / or the central framework closes one end of the central cavity to separate the dirty cavity from the clean cavity, and the third conduit part is arranged in the second end cover and / or the central framework and extends to the bottom of the shell.

[0026] In the technical scheme of the utility model, by arranging a part of the water discharge conduit on the central framework in the central cavity of the annular filter medium, the installation volume of the filter core in the filter is avoided from being occupied by the external conduit part, so that the capacity of the filter core for arranging more filter media in the filter is improved, and the filtering efficiency of the filter is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the structures shown in these drawings without creative labor.

[0028] Figure 1 It is a perspective view of an embodiment of the oil-water separation filter core provided by the utility model;

[0029] Figure 2 It is a perspective view of an embodiment of the oil-water separation filter core provided by the utility model; Figure 1 It is a perspective view of an embodiment of the oil-water separation filter core provided by the utility model;

[0030] Figure 3 It is a perspective view of an embodiment of the oil-water separation filter core provided by the utility model; Figure 1 It is a perspective view of an embodiment of the oil-water separation filter core provided by the utility model;

[0031] Figure 4 It is a perspective view of an embodiment of the oil-water separation filter core provided by the utility model; Figure 3 It is a perspective view of an embodiment of the oil-water separation filter core provided by the utility model;

[0032] Figure 5 It is a perspective view of an embodiment of the oil-water separation filter core provided by the utility model; Figure 1 It is a perspective view of an embodiment of the oil-water separation filter core provided by the utility model;

[0033] Figure 6 It is a perspective view of an embodiment of the oil-water separation filter core provided by the utility model; Figure 1 It is a perspective view of an embodiment of the oil-water separation filter core provided by the utility model;

[0034] Figure 7A three-dimensional schematic view of one embodiment of the filter provided by the utility model;

[0035] Figure 8 A Figure 7 top view;

[0036] Figure 9 A Figure 8 sectional view of B-B section in the middle;

[0037] Figure 10 A sectional view of another embodiment of the filter provided by the utility model.

[0038] In the drawing: oil-water separation filter element-100, annular filter medium-1, central cavity-1a, first end cover-2, first through hole-2a, transverse part-21, vertical part-22, second end cover-3, second through hole-3a, central framework-4, opening-4a, second conduit part-41, rib plate-42, water blocking net-43, water tank-44, third conduit part-5, sealing element-6, filter-1000, shell-200, first channel-200a, second channel-200b, third channel-200c, contaminated cavity-200d, clean cavity-200e, shell-201, screw cap-202, central tube-203, water level sensor-204.

[0039] The implementation, functional features and advantages of the utility model will be further described with reference to the drawings in combination with embodiments. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the application will be clearly and completely described in combination with the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0041] In order to better describe and illustrate the embodiments of the application, one or more drawings can be referred to, but additional details or examples used to describe the drawings should not be considered as limiting the scope of the utility model creation, the currently described embodiments or any one of the preferred modes of the application.

[0042] In the description of the utility model, it should be explained that the directions or position relationships indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like are the position relationships based on the position relationships shown in the drawings, and are only for the convenience of describing the utility model, and do not indicate that the device must have a specific direction or be operated in a specific direction, so it should not be understood as a limitation on the utility model.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0044] Because the prior art does not fully design the structure of the filter assembly, the above structure, although promoting the effective, simple and repeatable positioning of the water collecting and discharging element in the filter group, increases the installation volume of the filter element in the filter, thereby reducing the ability to set more filter medium in the filter.

[0045] In view of this, the utility model provides an oil-water separation filter core, Figures 1-6 For the oil-water separation filter core embodiment provided by the utility model, please refer to Figures 1-6 The oil-water separation filter core 100 comprises annular filter medium 1, first end cover 2 and second end cover 3 connected to both ends of annular filter medium 1, and central framework 4.

[0046] Specifically, annular filter medium 1 is in a straight cylinder shape, is made of filter material, has openings at both ends, and has a central cavity 1a arranged around the central axis inside; first end cover 2 and second end cover 3 are connected to both ends of annular filter medium 1 by means of hot melt welding, adhesive bonding and the like; wherein, first end cover 2 is provided with a first conduit portion 21 / 22 of the water discharging conduit, so that water can flow through first end cover 2. Central framework 4 is in a tubular structure, is arranged coaxially in the central cavity 1a, and is connected to first end cover 2 and second end cover 3 at both ends, and / or the outer periphery of central framework 4 is connected to the inner wall of annular filter medium 1, so that annular filter medium 1 can be supported and prevented from collapsing; central framework 4 is provided with a second conduit portion 41 of the water discharging conduit, which is connected to the first conduit portion 21 / 22, so that water can flow through central framework 4. It also includes a third conduit portion 5, one end of which is connected to the second conduit portion 41 on the central framework 4, and the other end extends out of the central cavity 1a, that is, the end face of the second end cover 3.

[0047] In the technical scheme of the utility model, by arranging a part of the water discharging conduit on the central framework 4 in the central cavity 1a of the annular filter medium 1, the conduit is avoided to be arranged on the outside of the annular filter medium 1, so that the installation volume of the filter core 100 in the filter is not occupied, thereby improving the ability to set more filter medium 1 in the filter, and further improving the filtering efficiency of the filter.

[0048] To avoid separately installing the first conduit portion 21 / 22 of the water discharging conduit, please refer toFigure 6 In an embodiment of the present application, the first conduit portion 21 / 22 and the first end cover 2 are integrally formed, and the passage is formed inside the first end cover 2 by integrally injection molding, and the openings are formed on the two end faces of the first end cover 2.

[0049] To avoid separately installing the second conduit portion 41 of the water discharge conduit, please refer to Figure 6 In an embodiment of the present application, the second conduit portion 41 and the center skeleton 4 are integrally formed, and the passage is formed on the main body of the center skeleton 4 by integrally injection molding, and the passage extends in the axial direction. In this embodiment, the openings at both ends of the passage are arranged close to the first end cover 2 and the second end cover 3, respectively.

[0050] To make the first conduit portion 21 / 22 and the second conduit portion 41 of the water discharge conduit communicate, please refer to Figure 3 and 6 In an embodiment of the present application, the connection between the first conduit portion 21 / 22 and the second conduit portion 41 is tightly matched, so that the interface is sealed to prevent water leakage. Specifically, the inlet of the first conduit portion 21 / 22 on the first end cover 2 faces the center cavity 1a, and the inlet and outlet of the second conduit portion 41 are arranged on the two ends of the center skeleton 4. Moreover, one end of the center skeleton 4 is provided with an annular water groove 44, the outlet of the second conduit portion 41 is arranged on the bottom of the water groove 44, and the wall of the water groove 44 tightly abuts against the end face of the first end cover 2, so that the connection between the first conduit portion 21 / 22 and the second conduit portion 41 is sealingly communicated to facilitate the flow of water.

[0051] To make the fuel flow between the center skeleton 4, please refer to Figure 3 and 6 In an embodiment of the present application, the center skeleton 4 is provided with a plurality of rib plates 42 rising in a spiral shape in the circumferential direction, the main body of the center skeleton 4 has a plurality of supports, each rib plate 42 is obliquely connected to the support of the center skeleton 4, and openings 4a through which fuel passes are formed between the rib plates 42. When the fuel is in the center cavity 1a, the fuel can quickly flow on the rib plates 42 under the action of pumping and gradually rise to speed up the speed of the fuel passing through the openings 4a.

[0052] The fuel contains water, in order to separate the fuel and the water, please refer to Figure 3 and 6 In an embodiment of the present application, a water blocking net 43 is further included, the water blocking net 43 is annular and extends in the axial direction, and is coaxially arranged in the center cavity 1a. When the fuel enters the center cavity 1a from the outside of the annular filter medium 1, it will pass through the annular water blocking net 43, the water blocking net 43 can block the water in the fuel, and the fuel with water removed continues to be pumped out.

[0053] In order to fix the water-blocking net 43, please refer to Figure 6 In an embodiment of the present application, the water-blocking net 43 is fixedly connected to the center framework 4, and the connection mode can be hot melting welding, adhesive bonding, etc. The water-blocking net 43 is arranged at the inner periphery of the center framework 4, and relatively closes all the openings on the center framework 4. When the fuel flows along the surface of the rib plate 42 under the pumping action, the fuel passes through the water-blocking net 43 to enter the inside of the center framework 4, so as to intercept the water in the fuel flowing radially inward through the openings.

[0054] Here, it should be noted that the center of one of the first end cover 2 and the second end cover 3 is provided with a first through hole 2a for communicating with the oil outlet channel of the filter, and the pump will generate negative pressure in the oil outlet channel to extract clean fuel in the center cavity 1a. It should be understood that in order to enable the fuel to pass through the water-blocking net 43 under the pumping action, the end of the center framework 4 away from the first through hole 2a is closed, and the end close to the first through hole 2a is open, and the annular water-blocking net 43 and the center framework 4 form a flow space of fuel without water, so that the first through hole 2a directly communicates with the flow space. In this embodiment, the center of the first end cover 2 is provided with the first through hole 2a, and an O-ring for sealingly connecting with the oil outlet channel is arranged.

[0055] Of course, the other one of the first end cover 2 and the second end cover 3 also needs to be provided with a second through hole 3a, so that the water separated from the fuel can flow out of the center cavity 1a. Please refer to Figure 4 In this embodiment, the third conduit portion 5 extends out of the filter element 100 from the through hole. It should be understood that the third conduit portion 5 can be separately provided or integrally provided on the second end cover 3; in this embodiment, it is separately provided, and the end thereof extending out of the filter element 100 is used for sucking the water separated from the filter element 100.

[0056] The inlet and outlet of the first conduit portion 21 / 22 are respectively arranged on the two side end faces of the first end cover 2, in order to avoid interference with the through hole of the first end cover 2. Please refer to Figure 6 In an embodiment of the present application, the first conduit portion 21 / 22 includes a transverse portion 21 perpendicular to the axial direction of the annular filter medium 1, and a vertical portion 22 parallel to the axial direction of the annular filter medium 1, and the transverse portion 21 and the vertical portion 22 are in communication with each other.

[0057] In the present embodiment, since the water inlet is in the third conduit portion 5 and successively flows to the second conduit portion 41, the first conduit portion 21 / 22 to the water outlet of the filter, the inlet of the first conduit portion 21 / 22 is opened on the inner side end face of the first end cover 2 facing the central cavity 1a, and the outlet is on the outer side end face of the first end cover 2. In order to prevent the outlet and the first through hole 2a from interfering with each other, the horizontal portion 21 of the first conduit portion 21 / 22 needs to extend outwardly (preferably radially) from the inlet, the horizontal portion 21 is located inside the first end cover 2, and the vertical portion 22 is a vertical pipe protruding outwardly on the first end cover 2, which extends in the axial direction and is arranged away from the first through hole 2a without interfering with each other, so as to communicate with the water outlet and the oil outlet on the filter housing 201 respectively. An O-ring is arranged on the vertical pipe and sealingly connected with the water outlet.

[0058] Figures 7-9 An embodiment of the filter is provided for filtering fuel in a motor vehicle engine system, as shown in Figures 7-9 The filter 1000 comprises the oil-water separation filter element 100 and the housing 200, the housing 200 is cup-shaped and comprises a housing body 201 having an opening and a screw cap 202 for sealingly connecting with the opening, both of which define an internal volume of the housing 200, the oil-water separation filter element 100 is contained in the internal volume of the housing 200, the housing 200 has a first passage 200a for the fuel to be filtered to enter, a second passage 200b for the filtered fuel to flow out, and a third passage 200c for the separated water to be discharged. The oil-water separation filter element 100 divides the internal volume of the housing 200 into a contaminated cavity 200d in communication with the first passage 200a and a clean cavity 200e in communication with the second passage 200b, and the first conduit portion 21 / 22 of the water discharge conduit is connected with the third passage 200c. It should be noted that the vertical portion 22 (vertical pipe) of the first conduit portion 21 / 22 is provided with a sealing ring and connected with the third passage 200c, so that the first conduit portion 21 / 22 and the third passage 200c are sealingly communicated. In addition, in other embodiments, the third conduit portion 5 of the water discharge conduit can also be connected with the third passage 200c.

[0059] In the present embodiment, since the water-blocking net 43 is arranged in the central cavity 1a, the outer side of the annular filter medium 1 is used for intercepting contaminants, and the inner side (central cavity 1a) of the annular filter medium 1 is used for containing clean fuel.

[0060] In order to extract the clean fuel in the central cavity 1a, as shown in Figure 9The shell 200 is provided with a center tube 203 forming a second channel 200b, which is sealingly connected with the first through hole 2a on the first end cover 2 of the filter element 100 through an O-ring, and extends into the center cavity 1a, so that the second channel 200b communicates with the center cavity 1a, that is, the cleaning cavity 200e of the oil-water separation filter element 100, and the clean fuel in the center cavity 1a can be pumped into the second channel 200b.

[0061] To separate the contaminated cavity 200d from the cleaning cavity 200e, please refer to Figure 9 In an embodiment of the present application, the oil-water separation filter element 100 is provided with a sealing element 6, which is an O-ring, and the outer periphery of the second end cover 3 is provided with an annular structure, and the O-ring is installed in the annular structure in a sleeving manner, and is used for sealingly connecting with the inner wall of the shell 200. Therefore, the outer side of the filter element 100 (excluding the lower part of the O-ring) and the inner wall of the shell 200 are separated, and the fuel pumped in through the first channel 200a first enters the contaminated cavity 200d, and then passes through the annular filter medium 1 to filter the particulate matter, and enters the cleaning cavity 200e (the center cavity 1a), and then passes through the water-blocking net 43, and finally enters the second channel 200b.

[0062] To enable water to deposit at the bottom of the shell 201, please refer to Figure 9 In an embodiment of the present application, the center of the second end cover 3 is provided with a second through hole 3a, which is used for communicating the center cavity 1a with the bottom of the shell 200, thereby forming the cleaning cavity 200e. The fuel flows on each spiral rising rib plate 42 of the center framework 4 and enters the water-blocking net 43, and the water is separated and accumulated on the water-blocking net 43. Since the specific gravity of water is greater than that of fuel, the water gradually sinks and finally deposits at the bottom of the shell 201. Therefore, the end portion of the center framework 4 corresponding to the second through hole 3a is partially closed to prevent the water-free fuel inside the annular water-blocking net 43 from flowing back, and is partially open to enable the water in the water-containing fuel outside the water-blocking net 43 to sink to the bottom of the shell 201 through the second through hole 3a. To enable the third conduit portion 5 to contact the water at the bottom of the shell 201, the third conduit portion 5 extends to the bottom of the shell 200.

[0063] In addition, the bottom of the shell 201 is provided with a water level sensor 204 for monitoring the water level of the water in the bottom of the shell, when the water level reaches the warning line, the water level sensor 204 will feedback to the control system to warn personnel to drain water. Since the water level sensor 204 is centrally arranged at the center position of the shell 201, in order to avoid interference with the third conduit portion 5, the third conduit portion 5 is inclinedly connected to the second conduit portion 41 of the central framework 4 relative to the axis. It should be understood that the third conduit portion 5 is a separately replaceable suction pipe, which includes a vertical portion capable of being inserted into the second conduit portion 41, and an offset portion arranged inclinedly relative to the axis.

[0064] Referring to Figure 10 In another embodiment of the present application, the second end cover 3 and the central framework 4 close one end of the central cavity 1a, at this time, the outer side of the filter core 100 and the inner wall of the shell 200 are the pollution-containing cavity 200d, and the central cavity 1a is the cleaning cavity 200e, so that the pollution-containing cavity 200d and the cleaning cavity 200e are separated. The third conduit portion 5 passes through the closed end of the central framework 4 and extends to the bottom of the shell 201, since the outer side of the filter core 100 is not provided with a sealing element, the pollutants intercepted in the pollution-containing cavity 200d and water (water enters the pollution-containing cavity 200d from the cleaning cavity 200e through the filter medium 1) can all settle at the bottom of the shell 201, so that the third conduit portion 5 can not only extract water, but also extract pollutants, and discharge to the outside through the third channel 200c.

[0065] The technical features of the above embodiments can be combined in any manner. In order to make the description simple, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0066] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. An oil-water separation cartridge, characterized by, include: An annular filter medium (1) having a central cavity (1a) set around its central axis; A first end cap (2) and a second end cap (3) are connected to both ends of the annular filter medium (1). The first end cap (2) is provided with the first conduit portion (21, 22) of the water discharge conduit (21, 22; 41; 5). A central frame (4) is provided in the central cavity (1a), the central frame (4) having a second conduit portion (41) of a water discharge conduit (21, 22; 41; 5); and, The third conduit portion (5) is connected at one end to the second conduit portion (41) on the central skeleton (4), and at the other end extends to the outside of the central cavity (1a) and is inclined relative to the axis.

2. The oil-water separation cartridge of claim 1, wherein, The first catheter portion (21, 22) and the second catheter portion (41) fit together tightly at the connection point.

3. The oil-water separation cartridge of claim 1, wherein, The central frame (4) is provided with a plurality of spirally rising ribs (42) along the circumference, and an opening (4a) for fuel to pass through is formed between each of the ribs (42).

4. The oil-water separation cartridge of claim 3, wherein, It also includes a water-blocking net (43), which is annular and located within the central cavity (1a).

5. The oil-water separation cartridge of claim 3 or 4, wherein, The water-blocking net (43) is fixed to the central frame (4) and is used to intercept water in the fuel that flows radially inward through the opening (4a).

6. The oil-water separation cartridge of claim 1, wherein, The first conduit portion (21, 22) includes a transverse portion (21) perpendicular to the axial direction of the annular filter medium (1) and a vertical portion (22) parallel to the axial direction of the annular filter medium (1).

7. A filter characterized by include: Oil-water separator filter element (100), wherein the oil-water separator filter element is the oil-water separator filter element according to any one of claims 1-6; The housing (200) has a first channel (200a) for the fuel to be filtered to enter, a second channel (200b) for the filtered fuel to flow out, and a third channel (200c) for the discharge of separated water; the oil-water separator filter element (100) divides the internal volume of the housing (200) into a contaminated chamber (200d) communicating with the first channel (200a) and a clean chamber (200e) communicating with the second channel (200b), and at least one conduit portion of the discharge conduit (21, 22; 41; 5) is connected to the third channel (200c).

8. The filter of claim 7, wherein The oil-water separator filter element (100) is provided with a sealing element (6) for sealing connection with the inner wall of the housing (200) to separate the contaminated chamber (200d) from the clean chamber (200e).

9. The filter of claim 8, wherein The second end cap (3) has a second through hole (3a) at its center for connecting the central cavity (1a) and the bottom of the outer shell (200), and the third conduit portion (5) extends to the bottom of the outer shell (200).

10. The filter of claim 7, wherein The second end cover (3) and / or the center skeleton (4) close one end of the center cavity (1a) to separate the dirty cavity (200d) from the clean cavity (200e), and the third conduit portion (5) is arranged in the second end cover (3) and / or the center skeleton (4) and extends to the bottom of the shell (200).

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