JP2013237023A - Filter element and filter apparatus provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter element using a filter medium fine in texture for a filter body, and capable of preventing the filter body from clogging and being obstructed even if filtering a fluid that contains a great amount of particles with a small particle size, and a filter apparatus provided with the same.SOLUTION: A filter body 22 where a fuel passes in the thickness direction of a filter medium is composed of a first filter medium 221 provided for a part of a fuel passing area in an extension direction of the filter medium, and a second filter medium 222 provided for the remainder of the fuel passing area. The second filter medium 222 is formed to be finer in texture and have higher filtration performance than the first filter medium 221.

Description

  The present invention relates to a filter element for filtering a fluid such as fuel supplied to an internal combustion engine of a vehicle, for example, and a filter device including the filter element.

  2. Description of the Related Art Conventionally, there is a filter device that includes a filter element having a filter body and filters fuel that passes through the filter body in the thickness direction of the filter medium. As such an apparatus, an apparatus in which the entire passage region of the fuel is configured with the same filter medium in the spreading direction of the filter medium is known (for example, see Patent Document 1).

JP 2009-106878 A

  However, in the filter device of the above prior art, if the filter body is made of a fine filter medium for the purpose of improving the filtration performance of the filter element, clogging occurs when a fluid containing a large amount of particles having a small particle diameter is filtered. There is a problem that it is likely to occur. For example, when the fluid fuel is light oil and the paraffin component in the light oil is solidified into a small particle size under a low temperature environment, the filter medium is uniformly clogged and clogged. May cause a bug.

  The present invention has been made in view of the above points. Even when a fine filter medium is used for the filter body and a fluid containing a large amount of particles having a small particle diameter is filtered, the filter body is clogged and clogged. An object of the present invention is to provide a filter element capable of preventing this and a filter device including the same.

In order to achieve the above object, in the present invention,
The filter body (22)
A first filter medium (221) provided in a part of a fluid passage region in the spreading direction of the filter medium;
And a second filter medium (222) that is provided in the remaining part of the passage region and has a finer mesh than the first filter medium and has a high filtering performance.

  According to this, a part of the fluid passage region of the filter body is the first filter medium that is coarser than the second filter medium, and the second filter medium that is finer than the first filter medium is used for the remainder. Therefore, when a fluid containing a large amount of particles having a small particle size is filtered, even if the second filter medium is fine and has high filtration performance, the first filter medium is coarser than the second filter medium. hard.

  That is, even if the filter body constituted by the second filter medium having a fine mesh and a high filtration performance is clogged and clogged, the filter medium according to the present invention is used as the first filter medium. It is possible to allow fluid to pass through, and it is possible to prevent the filter body from being uniformly clogged and blocked. Thus, even if a fine filter medium is used for the filter body and a fluid containing a large amount of particles having a small particle diameter is filtered, the filter body can be prevented from being clogged and clogged.

  In addition, the code | symbol in the parenthesis attached | subjected to each said means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

1 is a longitudinal sectional view showing a schematic configuration of a fuel filter device 1 according to a first embodiment to which the present invention is applied. It is the II-II sectional view taken on the line of FIG. 1, and only the filter body 22 is illustrated. It is the perspective view which expanded and illustrated two layers of the filter body 22, and has shown the partial cross section. It is a schematic diagram which shows the fuel passage state of the filter body 22, and has shown the oil permeation state in normal environment. It is a schematic diagram which shows the fuel passage state of the filter body 22, and has shown the oil passage state in a low-temperature environment. It is a graph which shows the filtration efficiency of a filter body. It is a graph which shows the change of the pressure loss of the filter body in a low temperature environment. It is sectional drawing which shows a part of 22 A of filter bodies in 2nd Embodiment.

  A plurality of modes for carrying out the present invention will be described below with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. In the case where only a part of the configuration is described in each embodiment, the other parts of the configuration are the same as those described previously. In addition to the combination of parts specifically described in each embodiment, the embodiments may be partially combined as long as the combination is not particularly troublesome.

(First embodiment)
A first embodiment to which the present invention is applied will be described with reference to FIGS.

  A fuel filter device 1 shown in FIG. 1 is used in, for example, a common rail system that supplies fuel to a diesel engine that is an internal combustion engine. The fuel filter device 1 is mounted, for example, in the engine room of a vehicle in the posture shown in FIG. 1 and is interposed in a fuel supply path for supplying fuel in the fuel tank to the high-pressure pump. Etc. are removed. In the present embodiment, the fuel filter device 1 corresponds to a filter device, and the fuel corresponds to a fluid.

  As shown in FIG. 1, the fuel filter device 1 includes a housing 10, a filter element 20, an introduction pipe 30, an outlet pipe 40, and the like. The filter element 20 is accommodated in the housing 10. The introduction pipe 30 is provided on the upper surface of the housing 10 and is for introducing fuel into the housing 10. A lead-out pipe 40 is also provided on the upper surface of the housing 10, and is for leading fuel out of the housing 10.

  The housing 10 includes a case 11 and a cap 12. The case 11 is a cup-shaped (bottomed cylindrical) member that constitutes the outer shell, and the cap 12 is a member that is attached to the upper opening end of the case 11. Both the case 11 and the cap 12 are made of polyamide resin, for example. The cap 12 is attached to the case 11 by joining the flange portion projecting radially outward from the upper end portion of the case 11 and the outer peripheral edge portion of the cap 12 by welding, for example.

  The filter element 20 includes a center pipe 21 that is a central cylinder, a filter body 22, a packing 24, an adhesive 25, and the like. The filter body 22 is made of, for example, a non-woven body of rayon resin fibers. The center pipe 21 is made of, for example, polyamide resin, and is disposed so as to penetrate the center of the filter body 22 in the vertical direction. A through passage 211 that penetrates in the vertical direction (in the axial direction of a cylindrical portion 111 described later) is formed inside the center pipe 21. The packing 24 is provided on the upper end surface of the center pipe 21. The adhesive 25 is provided on the upper part of the outer peripheral surface of the filter body 22.

  The packing 24 is a sealing member that seals between the upper end of the center pipe 21 and the lower surface of the cap 12 in a circumferential shape so as to surround the downstream opening of the introduction pipe 30. The adhesive 25 is a seal member that seals between the outer peripheral surface of the filter medium 22 and the inner peripheral surface of a cylindrical portion 111 described later of the case 11. As long as the seal 24 seals between the upper end of the center pipe 21 and the lower surface of the cap 12, the packing 24 may be provided in advance on the cap 12 side by, for example, two-color molding. The adhesive 25 may be provided in advance on the case 11 side by, for example, two-color molding as long as it seals between the outer peripheral surface of the filter medium 22 and the inner peripheral surface of the cylindrical portion 111. .

  In the case 11, for example, a cylindrical tubular portion 111 extending in the vertical direction and a bottom surface portion 112 provided so as to close the lower end of the tubular portion 111 are integrally formed. The filter element 20 is disposed in a relatively upper portion inside the tubular portion 111 in the housing 10, and an outer peripheral surface is in contact with the entire circumference along the inner peripheral surface of the tubular portion 111. In the housing 10, an upper space 10 a is formed above the filter medium 22 of the filter element 20, and a lower space 10 b larger than the upper space is formed below the filter element 20.

  The lower space 10 b forms a water reservoir chamber 13 for storing water separated from fuel passing through the housing 10. A drain port 113 for discharging the water stored in the water reservoir 13 to the outside of the housing 10 is formed at the lowermost portion of the cylindrical portion 111. A drain cock 14 for opening and closing the drain port 113 is attached to the drain port 113.

  As shown in FIG. 2, a sheet-like filter body 22 is wound around a center pipe 21 that is a core material (not shown) to constitute a main part of the filter element 20. As shown in FIGS. 2 and 3, the filter body 22 is a sheet body formed by bonding a flat plate-like first filter medium 221 and a corrugated second filter medium 222. The second filter medium 222 of the present embodiment is a corrugated plate having a cross section in which semicircular arcs are continuous, and the folded portion between adjacent arcs is bonded to the first filter medium 221. Note that the upper side of the filter body 22 shown in FIG. 3 is the lower side in FIG.

  The first filter medium 221 and the second filter medium 222 are formed of filter media having different filtration performance. The second filter medium 222 has finer eyes than the first filter medium 221, and has a higher filtering performance than the first filter medium 221.

  Specifically, the second filter medium 222 is configured by rayon resin fibers that are fibrillated by, for example, a beating process that generates unraveling of the rayon resin fibers that form the first filter medium 221. Here, the fibrillation is to form a branched structure such as fluffing and flapping on the outer surface of the fiber. The second filter medium 222 has finer eyes than the first filter medium 221 in which fibers that have not been fibrillated are entangled with each other because the fibrillated fibers are entangled with each other.

  As shown in FIG. 3, the filter body 22 has an internal space 28 formed therein by bonding a first filter medium 221 and a second filter medium 222. The internal space 28 is a space having a semicircular cross section (a cross section perpendicular to the axis of the cylindrical portion 111), and extends in the vertical direction, with the bottom portion (the ceiling portion in FIG. 1) at the lower end in FIG. It is blocked by the adhesive 223. Therefore, the filter body 22 is a sheet body in which the bottomed tubular filter media 23 forming the inner space 28 which is a semi-cylindrical space (so-called kamaboko-shaped space) are arranged in a line and connected in parallel.

  When the filter body 22 forming this sheet body is wound around the center pipe 21, by adhering an adhesive 224 between the first filter medium 221 and the second filter medium 222 of adjacent layers, The filter body 22 is integrated. As a result, an external space 29 is formed between the first filter medium 221 and the second filter medium 222 of the adjacent layers, which is external to the bottomed tubular filter medium 23 that forms the internal space 28. The adhesive 224 adheres the first filter medium 221 and the second filter medium 222 of the adjacent layers in the vicinity of the open end of the bottomed tubular filter medium 23 (in the vicinity of the upper end of FIG. 3). . A space below the adhesive 224 in FIG. 3 is an external space 29.

  In the fuel filter device 1 configured as described above, the fuel introduced into the housing 10 via the introduction pipe 30 flows through the through passage 211 of the center pipe 21 and flows into the lower space 10b. In the lower space 10 b, moisture condensed from the fuel that has flowed in settles and is stored in the water reservoir 13. The fuel that has flowed into the lower space 10b passes through the filter body 22 of the filter element 20, and at that time, agglomeration of fine water droplets and removal of foreign matters are performed.

  Due to the filter structure described above, all of the fuel that has flowed into the integrated filter body 22 from the lower end face in FIG. 1 (upper end face in FIG. 3) is contained in the internal space 28 shown in FIGS. Flow into. Then, when passing through one of the first filter medium 221 and the second filter medium 222, it is filtered and flows out to the external space 29. The fuel from which moisture and foreign matter have been removed by passing through the filter body 22 flows from the external space 29 through the upper space 10 a shown in FIG. 1 and is led out of the housing 10 through the lead pipe 40.

  For example, in a normal environment where light oil as a fuel is at room temperature, as shown in FIG. 4, when the fuel moves from the internal space 28 to the external space 29, the fuel is both in the first filter medium 221 and the second filter medium 222. Pass through. Aggregation of water droplets in the fuel and removal of foreign matters are performed by both the first filter medium 221 and the second filter medium 222.

  On the other hand, for example, in a low temperature environment in which light oil as a fuel is at a low temperature, the paraffin component in the light oil is solidified into solid fine particles (solid wax particles). When the fuel moves from the internal space 28 to the external space 29, the fine particles of the paraffin component may clog the second fine filter medium 222. In such a case, as shown in FIG. 5, the fuel passes through the first filter medium 221 having a relatively coarse mesh. Aggregation of water droplets in the fuel and removal of foreign substances are performed by the first filter medium 221.

  According to the fuel filter device 1 having the above-described configuration, the filter body 22 through which the fuel passes in the thickness direction of the filter medium includes the first filter medium 221 provided in a part of the fuel passage region in the filter medium spreading direction and the fuel passage. It is comprised with the 2nd filter medium 222 provided in the remainder of the area | region. And the 2nd filter medium 222 is formed more finely than the 1st filter medium 221, and the filtration performance is high.

  Here, the spreading direction of the filter medium is a direction in which the filter medium extends in a direction intersecting the thickness direction of the filter medium through which the fuel passes. The flat plate-shaped first filter medium 221 is a direction in which the flat plate expands, and the corrugated plate-shaped second filter medium 222 is a direction in which the corrugated sheet expands while repeating a semicircular arc shape.

  Therefore, in one tube-shaped filter medium 23, as shown in FIG. 3, a flat plate-like portion (a portion made of the first filter medium 221) and a curved plate-like portion (a second filter medium 222) surrounding the semi-cylindrical internal space 28 are formed. In each part, the direction perpendicular to the thickness direction of the filter medium is the spreading direction of the filter medium. In the curved plate-like portion of the tubular filter medium 23, the direction in which the curved surface extends perpendicularly to the thickness direction of the filter medium is the spreading direction of the filter medium.

  Thus, when the spreading direction of the filter medium is defined, the first filter medium 221 is provided in a part of the region through which the fuel passes in the spreading direction of the filter medium, and the first filter medium 221 is provided in the remainder of the region through which the fuel passes in the spreading direction of the filter medium. Two filter media 222 are provided.

  According to this, even when the fuel containing a large amount of solid particles having a small particle size such as a paraffin component solidified in a low temperature environment is filtered, even if the second filter medium 222 having fine and high filtering performance is clogged. The first filter medium 221 having a coarser mesh than the second filter medium 222 is less likely to be clogged.

  That is, even when the filter body configured with the second filter medium 222 having a fine filter area and a high filtration performance is clogged and clogged, the filter body 22 according to the present embodiment is the first. The fuel can be passed through one filter medium 221. Therefore, it can prevent that the filter body 22 is clogged uniformly and obstruct | occluded. In this way, even when the second filter medium 222 having a fine particle size is used for the filter body 22 and the fuel containing a large amount of particles having a small particle diameter is filtered, the filter body 22 is prevented from being clogged and blocked. be able to.

  In a normal environment, fuel can be filtered with the first filter medium 221 and the second filter medium 222 having relatively high filtration performance. Therefore, the filter body 22 can have a relatively high filtration efficiency.

  Further, in the fuel passage area, the area in which the second filter medium 222 is disposed is wider than the area in which the first filter medium 221 is disposed. Therefore, even if the 1st filter medium 221 is used for a part of fuel passage area, the fall of filtration performance can be controlled. It is preferable that the ratio of the arrangement area of the first filter medium 221 and the arrangement area of the second filter medium 222 is 1: 1.2 to 1.5.

  6 and 7, the filter body 22 of this example is shown by a solid line, and as a comparative example, a filter body that is entirely composed of the same high-efficiency filter paper as the second filter medium 222 is shown by a broken line, and all of the filter body is a first comparative example. A filter body made of the same normal filter paper as that of the filter medium 221 is indicated by a one-dot chain line. Moreover, in FIG. 7, the filter body which used the filter paper for which the whole filtration efficiency is the same as the filter body 22 of this example as a comparative example is shown with the fine broken line.

  The evaluation test of the filtration efficiency whose result is shown in FIG. 6 is based on ISO19438. MIL H 5606 was used as the fuel, and the flow rate was 2.0 L / min. It is said. The dust added to the fuel is ISO12103-1 A3 Medium dust, and the dust concentration is 10 mg / L.

  As shown in FIG. 6, according to the filter body 22 of this example, it is possible to obtain a higher filtration efficiency than a filter body that is entirely composed of normal filter paper. The filter body 22 is a relatively high-performance filter body capable of capturing 98% or more of particles having a particle diameter of 5 μm or more.

  On the other hand, the evaluation test of pressure loss (that is, oil passage resistance) due to clogging of the filter body in the low temperature environment whose results are shown in FIG. 7 is performed under the following conditions. As fuel, JIS No. 2 diesel oil with additives is used. The fuel flow rate is 1.2 L / min. The fuel temperature is −10 ° C.

  As shown in FIG. 7, according to the filter body 22 of this example, the pressure loss due to clogging is less likely to be greater than that of a filter body that is composed entirely of high-efficiency filter paper. In addition, the pressure loss is less likely to be greater than that of a filter using all the filter paper having the same overall filtration efficiency as that of the filter 22.

  In the filter element 20 of the present embodiment, the first filter medium 221 has a flat plate shape, the second filter medium 222 has a corrugated plate shape, and the filter medium 22 is formed by joining the first filter medium 221 and the second filter medium 222. ing. Accordingly, it is possible to easily form a configuration in which the second filter medium 222 is wider in the fuel passage area than the first filter medium 221 is disposed.

(Second Embodiment)
Next, a second embodiment will be described based on FIG.

  2nd Embodiment differs in the structure of a filter body compared with the above-mentioned 1st Embodiment. In addition, the component which attached | subjected the same code | symbol as drawing based on 1st Embodiment, and the other structure which is not demonstrated in 2nd Embodiment are the same as that of 1st Embodiment, and there exists the same effect. It is.

  As shown in FIG. 8, in the filter body 22A of the present embodiment, for example, a flat filter base material 22b is provided over the entire area of the fuel passage region. For example, a flat plate-shaped high-performance filter medium 22c is partially overlaid on the filter base 22b. The high performance filter medium 22c is a filter medium that has finer eyes and higher filtration performance than the filter base material 22b. For the filtration base material 22b, for example, the same filter medium as the first filter medium 221 of the first embodiment can be used. For the high performance filter medium 22c, for example, a filter medium similar to the second filter medium 222 of the first embodiment can be used.

  Of the filter body 22A, the portion consisting only of the filter base 22b is the first filter medium 221A of the present embodiment. Further, in the filter body 22A, a portion where the high-performance filter medium 22c is arranged on the filter base 22b is the second filter medium 222A of the present embodiment. Also in the filter body 22A of the present embodiment, it is preferable that the formation region of the second filter medium 222A is wider than the formation region of the first filter medium 221A.

  According to the configuration of the present embodiment, the same effects as those of the first embodiment can be obtained.

  Further, the filter body 22A is a first filter medium 221A in which a part of the fuel passage region is made of the filter base material 22b, and the remaining part is a second filter medium 222A in which the filter base material 22b and the high-performance filter medium 22c are layered. . According to this, a part of the fuel passage area of the filter 22A is coarser than the second filter medium 222A by partially overlapping the high performance filter medium 22c on the filter base 22b provided in the entire fuel passage area. It is possible to easily form a configuration in which the first filter medium 221A is used, and the remainder is the second filter medium 222A having a finer mesh than the first filter medium 221A.

(Other embodiments)
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  In each said embodiment, although the arrangement | positioning area | region of the 2nd filter medium was made larger than the arrangement | positioning area | region of a 1st filter medium, it is not limited to this. As long as the desired filtration efficiency can be obtained, the arrangement area of the first filter medium may be larger than the arrangement area of the second filter medium.

  Moreover, in each said embodiment, although the flat filter medium and the corrugated filter medium were adhere | attached and the filter body was formed, it is not limited to this. For example, a filter body may be formed by combining a plurality of cylindrical tubular filter media. A filter medium may be formed by combining a relatively coarse tubular filter medium and a relatively fine tubular filter medium. The joining method of the filter media is not limited to adhesion, and may be, for example, welding.

  Further, the filter body is not limited to one made of a plurality of tubular filter media. For example, the filter medium may be formed by folding a sheet-like filter medium. Further, the shape of the filter body, the flow direction of the fuel, and the like are not limited to the above embodiment.

  Moreover, in each said embodiment, although the fuel filter apparatus 1 was used for the common rail system which supplies a fuel to a diesel engine, it is not limited to this. For example, it may be employed in a fuel supply system for a diesel engine using a distribution pump, or may be employed in a fuel supply system for a gasoline engine.

  The filter device to which the present invention is applied is not limited to the fuel filter device. That is, the fluid filtered by the filter body is not limited to fuel.

1 Fuel filter device (filter device)
20 Filter element 22, 22A Filter body 221, 221A First filter medium 222, 222A Second filter medium

Claims (5)

A filter element (20) having a filter body (22) for filtering a fluid passing in the thickness direction of the filter medium,
The filter body is
A first filter medium (221) provided in a part of a passage region of the fluid in the spreading direction of the filter medium;
A filter element comprising: a second filter medium (222) provided in a remaining portion of the passage region and having a finer mesh than the first filter medium and having high filtration performance.   The filter element according to claim 1, wherein the remaining portion is wider than the part of the passage region. The first filter medium has a flat plate shape,
The second filter medium is corrugated,
The filter element according to claim 2, wherein the first filter medium and the second filter medium are joined. A filtration substrate (22b) provided throughout the passage region;
A high-performance filter medium (22c) disposed on the filtration base material in the remaining portion, and having finer eyes and higher filtration performance than the filtration base material,
The part is the first filter medium (221A) made of the filter base material, and the remaining part is the second filter medium (222A) formed by stacking the filter base material and the high-performance filter medium. The filter element according to claim 1 or 2. A filter element according to any one of claims 1 to 4,
A housing (10) for accommodating the filter element therein,
The filter device, wherein the fluid passing through the housing is filtered by the filter element.

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