JP2011072910A - Filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the flow resistance of a liquid to be filtered while maintaining high filtering capacity. <P>SOLUTION: There is disclosed a filter including a mesh member 12 with a plurality of hexagonal small holes 11A, 11B, 11C formed thereon. Upon drawing a first imaginary circle and a concentric second imaginary circle thereon of a diameter √2 times as large as the diameter of the first imaginary circle, two opposite sides of the small hole 11A touch the first imaginary circle, and six angles a1 to a6 of the small hole 11A are disposed in an area outside of the first imaginary circle up to the second imaginary circle. The area of the opening of the small hole 11A is set to be greater than the area of an imaginary square inscribed in the second imaginary circle. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a filter for filtering a fluid.

  Conventionally, a filter that filters a fluid to be filtered such as engine oil has a mesh portion in which a large number of small holes are formed (see, for example, Patent Documents 1 and 2). The small hole of the filter of patent document 1 is a rectangle. Moreover, the small hole of the filter of patent document 2 is a hexagon. By adopting a hexagonal shape, it is possible to improve the aperture ratio of the filter and reduce the resistance when the fluid to be filtered flows.

JP 2001-179770 A JP 2000-186784 A

  By the way, when the fluid to be filtered passes through the filter, a flow resistance is generated. Since the resistance at this time leads to a loss, there is a demand to reduce as much as possible.

  On the other hand, in order to improve the filtration performance of the filter, the small holes in the mesh portion may be reduced. However, there is a problem that the smaller the small hole, the greater the flow resistance of the fluid to be filtered. This is the same whether it is a square hole or a hexagonal hole.

  This invention is made | formed in view of this point, The place made into the objective is to enable it to reduce the distribution | circulation resistance of the to-be-filtered fluid, ensuring high filtration performance.

  1st invention is a filter which has a mesh part in which many hexagonal small holes for filtering a to-be-filtered fluid were formed, Comprising: 1st virtual circle and 1st virtual concentric with the 1st virtual circle When a second virtual circle having a diameter √2 times the diameter of the circle is drawn, at least one pair of opposing sides of the small hole touches the first virtual circle, and the six corners of the small hole are The small hole is positioned in a region from the outside of the first virtual circle to the second virtual circle, and the opening area of the small hole is set to be larger than the area of the virtual regular square inscribed in the second virtual circle It is a feature.

  That is, as shown in FIG. 9, assuming that a virtual square inscribed in the second virtual circle is formed as a small hole in the mesh portion, a round shape that can be captured by the small hole of the regular square. The diameter of the foreign matter is not less than the dimension X1 between two opposing sides of a regular square. The dimension X1 between the two sides is equal to the diameter of the first imaginary circle because the square is inscribed in the second imaginary circle having a diameter √2 times that of the first imaginary circle. In other words, the diameter of the smallest round foreign material that can be captured by the virtual square small hole is equal to or larger than the diameter of the first virtual circle. In the present invention, as shown in FIG. 10, the two opposite sides A and B of the small hole are in contact with the first virtual circle, so that the round foreign matter is caught by these two sides A and B and captured. Is done. Thereby, it is possible to capture the round foreign matter in the same manner as in the case where the virtual regular square is a small hole.

  On the other hand, as shown in FIG. 11, the width dimension of the flat foreign material that can be captured by the small hole of the virtual regular square is the same as the diagonal length X2 of the regular square, and is therefore equal to the diameter of the second virtual circle. Become. In the present invention, as shown in FIG. 12, by positioning the six corners of the small hole in the region on the second virtual circle from the outside of the first virtual circle, the flat foreign matter is replaced with a virtual regular rectangular small hole. It is possible to capture evenly, or it is possible to capture even smaller objects than flat foreign objects that can be captured by a virtual regular square.

  Moreover, the flow resistance of the fluid to be filtered is reduced by making the opening area of the small holes larger than the virtual regular square.

  According to a second invention, in the first invention, at least a pair of corners of the small holes facing each other are positioned on the second virtual circle.

  According to a third aspect, in the second aspect, the six corners of the small hole are positioned on the second virtual circle.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the small hole is formed long in a predetermined direction, and the longitudinal direction of the small hole is set to correspond to the flow direction of the fluid to be filtered. It is characterized by this.

  According to the first invention, when the first imaginary circle and the second imaginary circle having a diameter √2 times the first imaginary circle are drawn concentrically, the two opposing sides of the small holes in the mesh portion are Since the six corners of the small hole are located in the area from the outside of the first virtual circle to the second virtual circle, it is equal to or more than the case where the small hole is a regular square. While obtaining high filtration performance, the flow resistance of the fluid to be filtered can be reduced by increasing the opening area of the small holes.

  According to the second invention, since the two opposite corners of the small hole are positioned on the second virtual circle, the opening area of the small hole can be sufficiently increased, and the flow resistance of the fluid to be filtered can be further increased. It can be further reduced.

  According to the third invention, by positioning the six corners of the small hole on the second virtual circle, the opening area of the small hole can be further increased, and the flow resistance of the fluid to be filtered can be further reduced. .

  According to the fourth invention, since the longitudinal direction of the small hole is set along the flow direction of the fluid to be filtered, the fluid to be filtered can flow smoothly, and the flow resistance of the fluid to be filtered can be further reduced. .

It is a disassembled perspective view of an oil strainer. It is the perspective view which looked at a part of mesh part from the oil flow direction downstream. It is sectional drawing in the III-III line of FIG. It is a top view which expands and shows a part of mesh part. It is a figure which shows the small hole of the mesh part concerning the modification 1. FIG. It is the figure which looked at a part of mesh part concerning modification 2 from the oil flow direction upstream. It is the VII-VII sectional view taken on the line of FIG. FIG. 7 is a view corresponding to FIG. 6 according to Modification 3. It is a figure explaining the magnitude | size of the round foreign material which can be capture | acquired with a virtual square small hole. It is a figure explaining the magnitude | size of the round foreign material which can be caught with the small hole concerning this invention. It is a figure explaining the magnitude | size of the flat foreign material which can be capture | acquired with a virtual square small hole. It is a figure explaining the magnitude | size of the flat foreign material which can be caught with the small hole concerning this invention.

    Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature and is not intended to limit the present invention, its application, or its use.

  FIG. 1 is an exploded perspective view of an oil strainer 1 including a filter 10 according to an embodiment of the present invention. The oil strainer 1 is disposed in an oil pan (not shown) of an automobile engine and filters oil (filtered fluid) stored in the oil pan. In addition to the engine, the oil strainer 1 can be disposed, for example, in an oil pan of an automatic transmission.

  The oil strainer 1 includes a case 20 that houses the filter 10 in addition to the filter 10.

  The case 20 is formed to be long in a predetermined direction, and includes an upper member 21 and a lower member 22 that are divided vertically. Both the upper member 21 and the lower member 22 are formed by molding a resin material. The upper member 21 includes an upper wall portion 24 and a peripheral wall portion 25 extending downward from the peripheral edge portion of the upper wall portion 24. The lower member 22 includes a bottom wall portion 26 and a peripheral wall portion 27 extending upward from the peripheral edge portion of the bottom wall portion 26. Then, an oil flow path (not shown) is formed inside the case 20 by joining both the members 21 and 22 together with the lower end of the peripheral wall portion 25 of the upper member 21 and the lower end of the peripheral wall portion 27 of the lower member 22. It has become so.

  A suction pipe portion 28 is formed on the bottom wall portion 26 of the lower member 22 on one side in the longitudinal direction of the case 20. The suction pipe portion 28 communicates with the oil flow path and protrudes downward. The lower end of the suction pipe portion 28 is positioned in the vicinity of the bottom wall portion of the oil pan with the oil strainer 1 mounted on the engine.

  A flange 30 extending outward is formed on the peripheral wall portion 27 of the lower member 22. Further, a step portion 31 into which the filter 10 is fitted is formed on the inner surface of the peripheral wall portion 27 of the lower member 22.

  A discharge pipe portion 34 is formed on the upper wall portion 24 of the upper member 21 on the other side in the longitudinal direction of the case 20. The discharge pipe portion 34 communicates with the oil flow path and protrudes upward. As shown in FIG. 3, the oil sucked into the oil flow path in the case 20 from the suction pipe portion 28 flows upward to the other side in the longitudinal direction of the case 20 and is discharged from the discharge pipe portion 34. It has become.

  A flange 35 is formed at the upper end portion of the discharge pipe portion 34. The flange 35 is formed with an insertion hole 35a for a fastening member (not shown). The oil strainer 1 is fastened and fixed to the engine by a fastening member inserted through the insertion hole 35a.

  A flange 36 extending outward is formed on the peripheral wall portion 25 of the upper member 21. The flange 36 is welded to the flange 30 of the lower member 22 over the entire circumference. The flange 30 and the flange 36 are preferably welded using a welding method such as vibration welding or hot plate welding, but may be bonded using an adhesive, for example, although not shown, The upper member 21 and the lower member 22 may be coupled by providing a claw on one side of the lower member 22 and providing a hole portion for engaging the claw on the other side and engaging the claw with the hole portion. Good.

  As shown in FIG. 2, the filter 10 includes a mesh portion 12 having a large number of small holes 11 and a frame portion 13 provided so as to surround the outer peripheral portion of the mesh portion 12. The frame portion 13 is integrally formed of a resin material. That is, the filter 10 is an injection molded product.

  As shown in FIG. 3, the frame portion 13 is formed so as to protrude to the upstream side (lower side) and the downstream side (upper side) in the oil flow direction. The mesh portion 12 is disposed so as to be positioned between the upper wall portion 24 and the lower wall portion 26 of the case 20. In this state, the lower end portion of the frame portion 13 of the filter 10 is fitted into the stepped portion 31 of the lower member 22, and the upper end portion of the frame portion 13 is welded to the flange 36 of the upper member 21, whereby the filter 10 is positioned and fixed. Is done. The frame portion 13 of the filter 10 is preferably vibration welded or hot plate welded to the flange 36, but may be bonded using an adhesive. For example, although not shown, the frame portion 13 is attached to the upper portion. The member 21 and the lower member 22 may be sandwiched in the vertical direction.

  The mesh part 12 is formed in a substantially rectangular flat plate shape. As shown in FIG. 2, all the small holes 11 of the mesh part 12 are formed in a hexagonal shape so as to be regularly arranged. As shown in FIG. 4, the peripheral edge portion of the small hole 11 </ b> A is formed of first to sixth side constituent portions A <b> 1 to A <b> 6. A peripheral edge portion of the small hole 11B adjacent to the small hole 11A is formed of first to sixth side component parts B1 to B6. The peripheral edge portion of the small hole 11C adjacent to the small hole 11A and the small hole 11B is formed of first to sixth side constituent portions C1 to C6.

  The fourth side component B4 of the small hole 11B is common to the first side component A1 of the small hole 11A. Further, the third side component C3 of the small hole 11C is common to the sixth side component A6 of the small hole 11A. Further, the second side component C2 of the small hole 11C is common to the fifth side component B5 of the small hole 11B.

  Since all the small holes 11 of the mesh portion 12 have the same shape, the shape of the small holes 11A will be described in detail below in association with the first virtual circle and the second virtual circle. The first virtual circle is a circle having an arbitrary diameter. The second virtual circle is a circle having a diameter that is √2 times the diameter of the first virtual circle, and is located concentrically with the first virtual circle.

  The opposing second side component A2 and fifth side component A5 of the small hole 11A extend in parallel to each other, and the lengths thereof are the first, third, fourth, and sixth side components A1, A3, A3. It is set longer than A4 and A6. In addition, the first, third, fourth, and sixth side components A1, A3, A4, and A6 are all set to the same length. The first side component A1 and the fourth side component A4 extend in parallel with each other, and the third side component A3 and the sixth side component A6 also extend in parallel with each other.

  The widths of the first to sixth side components A1 to A6 are set so as to become narrower toward the upstream side in the oil flow direction. Therefore, as shown in FIG. 3, the cross-sectional area of the small hole 11A increases toward the upstream side in the oil flow direction, and the opening area upstream of the small hole 11A in the oil flow direction is larger than the opening area on the downstream side. Is also getting wider.

  As shown in FIG. 4, the center Xc of the small hole 11A is made to coincide with the center of the first virtual circle. At this time, the inner edge of the second side component A2 and the inner edge of the fifth side component A5 are in contact with the first virtual circle. In addition, the angle a1 formed by the first side component A1 and the sixth side component A6 and the angle a4 formed by the third side component A3 and the fourth side component A4 are the second virtual It is positioned on a circle. A corner a2 formed by the first side component A1 and the second side component A2, a corner a3 formed by the second side component A2 and the third side component A3, and a fourth side component A4 The angle a5 formed by the fifth side component A5 and the corner a6 formed by the fifth side component A5 and the sixth side component A6 are also positioned on the second virtual circle.

  The dimension between the corners a1 and a4 of the small hole 11A is set longer than the dimension between the second side component A2 and the fifth side component A5. That is, the small hole 11A has a shape that is long in the vertical direction in FIG.

  The opening area of the small hole 11A can be arbitrarily set according to the lengths of the first to sixth side components A1 to A6 and the positions of the corners a1 to a6. In this embodiment, the opening area of the small hole 11A on the downstream side in the oil flow direction is set to be larger than the area of a virtual regular square inscribed in the second virtual circle.

  The filter 10 is accommodated in the case 20 so that the longitudinal direction of the small hole 11 coincides with the longitudinal direction of the case 20.

  Next, the case where oil is filtered with the oil strainer 1 configured as described above will be described. When the oil pump of the engine is operated, the oil is sucked into the oil flow path in the case 20 from the suction pipe portion 28 of the case 20 as shown in FIG. The flow of oil in the oil flow path is a flow toward the discharge pipe portion 34, but the discharge pipe portion 34 is away from the suction pipe portion 28 and in the longitudinal direction of the case 20. As shown by an arrow Y in FIG. Therefore, the longitudinal direction of the small hole 11 corresponds to the oil flow direction. The angle α formed between the arrow Y and the upstream surface of the mesh portion 12 in the oil flow direction is 60 degrees in this embodiment, but is more than 60 degrees depending on the shape of the case 20 and the shape and position of the mesh section 12. It may be a small angle or a large angle. The oil flow may be a flow perpendicular to the mesh portion 12.

  The oil is filtered by passing through the small holes 11 of the mesh portion 12. If round foreign matter is mixed in the oil, as shown in FIG. 4, if the diameter is not less than the dimension X1 between the second side component A2 and the fifth side component A5, the second, It is caught by the fifth side constituent parts A2 and A5 and captured. That is, as shown for reference in FIG. 9, assuming that a virtual regular square inscribed in the second virtual circle is formed as a small hole, a round shape that can be captured by the small hole of the virtual regular square A round foreign object having the same diameter as the foreign object can be captured by the small hole 11 of the present embodiment.

  Further, when flat foreign matter is mixed in the oil, if the width is not less than the dimension X2 between the corners a2 and a5, the flat foreign matter is caught and captured. That is, as shown for reference in FIG. 11, the dimension X2 is the same as the diagonal length of the virtual regular square inscribed in the second virtual circle, and is therefore the same as the flat foreign matter that can be captured by the small hole of the virtual regular square. A flat foreign material having a width can be captured by the small hole 11 of the present embodiment.

  In addition, since the opening area of the small holes 11 is made larger than the virtual regular square, the oil flow resistance is reduced.

  As described above, according to this embodiment, the inner edges of the second side component A2 and the fifth side component A5 of the small hole 11A are positioned so as to contact the first virtual circle, and the six small holes 11A have six positions. Since the corners a1 to a6 are positioned on the second virtual circle, the opening area of the small hole 11A is increased while obtaining a filtration performance equivalent to that obtained when the small hole is a virtual square inscribed in the second virtual circle. Thus, the oil distribution resistance can be reduced.

  Further, by positioning all the corners a1 to a6 of the small hole 11A on the second virtual circle, the opening area of the small hole 11A can be sufficiently increased, and the oil flow resistance can be further reduced.

  In addition, since the longitudinal direction of the small hole 11A is set along the oil flow direction, the oil can flow smoothly, and this can further reduce the oil flow resistance.

  In the above embodiment, all the corners a1 to a6 of the small hole 11A are positioned on the second imaginary line. However, the present invention is not limited to this, and for example, the corners a2 and a3 are as shown in Modification 1 shown in FIG. , A5, a6 may be positioned in a region between the outside of the first virtual circle and the second virtual circle, and only the opposite corners a1, a4 may be positioned on the second virtual circle. Further, the corners a1 to a6 may be positioned in the region from the outside of the first virtual circle to the second virtual circle, and are not limited to the positions described above. For example, only the opposing corners a2 and a5 may be positioned on the second virtual circle, or only the opposing corners a3 and a6 may be positioned on the second virtual circle. Further, all of the corners a1 to a6 may not be positioned on the second virtual circle.

  Further, as in Modification 2 shown in FIG. 6, the mesh portion 12 may be formed with a protrusion 14 that protrudes upstream in the oil flow direction. The protrusions 14 are positioned in the vicinity of the intersections of the side components of the small hole 11. Further, as shown in FIG. 7, the height of the projection 14 is set so as not to hit the mainstream streamline of oil (indicated by a broken-line arrow in the figure). When the flat foreign material 100 (indicated by phantom lines in FIG. 7) adheres to the mesh portion 12 in such a posture that the small foreign material 100 closes the small hole 11, the protrusion 14 has oil between the opening of the small hole 11 and the flat foreign material 100. This is to form a gap that can be circulated so that the small hole 11 is not completely blocked. The formation position of the protrusion 14 may be a middle portion in the longitudinal direction of the side component part of the small hole 11. Moreover, the number and the formation position of the protrusion 14 can be set arbitrarily. Further, the shape of the protrusion 14 may be a shape that extends in the longitudinal direction of the side component. Furthermore, instead of the protrusions 14, only a part of the side components may be formed so as to protrude upstream in the oil flow direction.

  Further, as in Modification 3 shown in FIG. 8, ribs 15 that protrude toward the upstream side of the oil flow may be formed only on a part of the side portion of the small hole 11 of the mesh portion 12. In the third modification, the strength of the mesh portion 12 can be improved, and as described in the second modification, the small hole 11 can be prevented from being completely blocked by the flat foreign matter. Although not shown, the ribs may be provided so as to protrude toward the downstream side in the oil flow direction.

  Further, the lengths of the six side constituent portions of the small hole 11 may all be different. Further, only one set of side component parts facing each other, or two sets of side component parts facing each other, and each of the side component parts of three sets of side component parts facing each other may have the same length. Also, only two adjacent (one set) side component parts, or two sets of adjacent side component parts, and three adjacent side component parts of each set of side component parts have the same length. Good.

  Further, in the above-described embodiment, the opposing side component portions extend in parallel to each other. However, the present invention is not limited to this, and at least one opposing side component portion extends in parallel. Just do it.

  Moreover, although the said embodiment demonstrated the case where this invention was applied to the oil strainer 1, it is also possible to apply not only to this but the apparatus which filters water, and the apparatus which filters air.

  As described above, the filter according to the present invention can be applied to, for example, an oil strainer.

DESCRIPTION OF SYMBOLS 1 Oil strainer 10 Filter 12 Mesh part 11A Small hole A1-A6 1st-6th edge structure part a1-a6 Corner

Claims (4)

A filter having a mesh portion formed with a large number of hexagonal small holes for filtering a fluid to be filtered,
When a first virtual circle and a second virtual circle having a diameter √2 times the diameter of the first virtual circle concentrically with the first virtual circle are drawn,
At least one set of two sides facing each other of the small hole is in contact with the first virtual circle,
The six corners of the small hole are positioned in the region from the outside of the first virtual circle to the second virtual circle,
An opening area of the small hole is set larger than an area of a virtual regular square inscribed in the second virtual circle. The filter of claim 1,
A filter, wherein at least a pair of opposite corners of a small hole are positioned on a second virtual circle. The filter according to claim 2, wherein
A filter characterized in that six corners of the small hole are positioned on the second virtual circle. The filter according to any one of claims 1 to 3,
The small hole is formed long in a predetermined direction, and the longitudinal direction of the small hole is set so as to correspond to the flow direction of the fluid to be filtered.

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