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WO2018194060A1 - Dispositif de filtrage - Google Patents

Dispositif de filtrage Download PDF

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Publication number
WO2018194060A1
WO2018194060A1 PCT/JP2018/015878 JP2018015878W WO2018194060A1 WO 2018194060 A1 WO2018194060 A1 WO 2018194060A1 JP 2018015878 W JP2018015878 W JP 2018015878W WO 2018194060 A1 WO2018194060 A1 WO 2018194060A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
hole
inner cylinder
flow
substantially cylindrical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2018/015878
Other languages
English (en)
Japanese (ja)
Inventor
信 石塚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yamashin Filter Corp
Original Assignee
Yamashin Filter Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yamashin Filter Corp filed Critical Yamashin Filter Corp
Publication of WO2018194060A1 publication Critical patent/WO2018194060A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D19/00—Degasification of liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
    • B01D29/90—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding

Definitions

  • the present invention relates to a filter device.
  • a suction passage is provided in the lower part of a substantially cylindrical container, a return passage is provided on the side of the container, an inner cylinder is suspended from the top of the container, and the height direction of the container is provided on the outer peripheral surface of the inner cylinder.
  • a power steering oil tank provided with a rectifying plate extending in a protruding manner. In this power steering oil tank, since the flow of the oil swirling in the circumferential direction in the container is obstructed by the rectifying plate, the speed component in the circumferential direction of the oil is reduced, and the occurrence of vortex in the container is prevented.
  • the spiral flow (swirl flow) of the liquid swirling in the circumferential direction in the container is effective for removing air contained in the liquid. Since the air that has passed through the filter causes a problem, it is desirable to remove the air contained in the liquid using a swirling flow. However, since the swirl flow can contribute to a decrease in filtration performance, it is desirable to suppress the swirl flow in the vicinity of the filter medium.
  • the present invention has been made in view of such circumstances, and an object of the present invention is to provide a filter device capable of suppressing swirling flow in the vicinity of the filter medium while generating swirling flow to remove air contained in the liquid.
  • a filter device includes, for example, a substantially cylindrical filter medium that filters liquid, and a substantially cylindrical inner member that is lower than the height of the filter medium and contacts the inner peripheral surface of the filter medium.
  • the filter element has a lower end in contact with the inflow portion, and the inflow portion has a substantially cylindrical hole opened at the upper end surface, and both ends of the side surface of the inflow portion and the hole.
  • a liquid is caused to flow into the swirled liquid to generate a swirling flow, and the rectifying member is provided in the vicinity of the lower end of the filter element.
  • the substantially cylindrical filter medium in the substantially cylindrical filter case, the substantially cylindrical filter medium, the substantially cylindrical inner cylinder that is lower than the height of the filter medium and abuts the inner peripheral surface of the filter medium, A filter element is provided.
  • the inflow portion that covers the lower end of the filter case is formed with a substantially cylindrical hole that opens to the upper end surface, and the tubular portion whose both ends open to the side surface of the inflow portion and the side surface of the hole is an arbitrary side surface of the hole.
  • the liquid flows into the hole from the tangential direction at the point. Thereby, the swirl
  • the height direction positions of the lower end of the filter medium and the lower end of the inner cylinder are substantially the same, and a plurality of portions provided along the first central axis that is the central axis of the filter element are provided in the hollow portion of the inner cylinder.
  • a rectifying member having a plate-like portion is provided. Since the rectifying member is provided in the vicinity of the lower end of the filter element, the hydraulic oil flowing into the inflow portion passes through the space between the rectifying member and the inner cylinder and flows into the hollow portion of the filter element. Thereby, the flow of the hydraulic oil is rectified into a flow in a direction along the first central axis, and the swirling flow in the vicinity of the filter medium can be suppressed. As a result, it is possible to prevent a decrease in filtration performance due to the swirling flow.
  • the tubular portion has a substantially cylindrical round hole portion that opens to the side surface, and a connecting portion that connects the round hole portion and the hole, and the round hole portion is a plan view.
  • the central axis is provided at a position intersecting the first central axis, and the connecting portion is inclined with respect to the round hole portion in a plan view, and the connecting portion is a flow path as it approaches the hole.
  • the area may be gradually reduced.
  • the central axis of the round hole portion is provided at a position intersecting the first central axis, and the connecting portion is inclined with respect to the round hole portion, so that it remains compatible with the conventional filter device.
  • the swirl flow can be generated in the hydraulic oil. Further, as the flow path area of the connecting portion gradually decreases as it approaches the hole, the flow velocity is increased and a swirl flow is likely to occur in the hydraulic oil.
  • the plurality of holes may be formed at a position overlapping the inner cylinder in the height direction, and an air vent hole may be formed in the vicinity of the upper end of the filter case.
  • hydraulic fluid can be filtered using the whole filter medium.
  • the air removed from the liquid can be discharged outside from the air vent hole located at a position higher than the liquid level.
  • the height of the inner cylinder may be not more than half of the height of the filter medium. Thereby, the fall of the filtration performance by an inner cylinder can be suppressed.
  • the swirling flow in the vicinity of the filter medium can be suppressed while generating the swirling flow to remove the air contained in the liquid.
  • FIG. 2 is a perspective view showing an outline of the return filter 1, and is a view showing a state cut along a plane along the central axis A. It is the figure which cut
  • FIG. FIG. 6 is a view in which an inflow portion 41 is cut along a line B.
  • FIG. 4 is a cross-sectional view of the return filter 1 taken along the line CC.
  • FIG. 1 is a perspective view showing a main part of an outline of a hydraulic oil tank 100 (corresponding to a liquid tank of the present invention) in which a return filter 1 according to an embodiment of the present invention is provided.
  • the hydraulic oil tank 100 is installed in a working machine (not shown) (for example, a hydraulic device), and is a tank for storing hydraulic oil provided in a hydraulic circuit for hydraulic oil supplied to the hydraulic device. is there. In the hydraulic circuit, the hydraulic oil is introduced into the hydraulic oil tank 100 through the hydraulic device.
  • a working machine for example, a hydraulic device
  • the hydraulic oil is introduced into the hydraulic oil tank 100 through the hydraulic device.
  • the hydraulic oil tank 100 mainly has a box-shaped tank body 101.
  • the tank body 101 is hollow inside, and the return filter 1 and the suction strainer 9 are mainly provided inside the tank body 101.
  • a hole 101b into which the return filter 1 is inserted is formed in the upper surface 101a of the tank body 101.
  • a lid member 20 (detailed later) of the return filter 1 is provided on the upper surface 101a.
  • a bolt insertion hole (not shown) is formed in the peripheral portion of the lid member 20. By screwing a bolt into the bolt insertion hole, the lid member 20 (that is, the return filter 1) is fastened to the tank body 101.
  • the upper surface 101a is provided with an air breather (not shown) that filters air that enters the tank main body 101 along with the upper and lower oil levels so that dust and the like do not enter the hydraulic oil.
  • an outlet 101d for allowing the hydraulic oil in the tank body 101 to flow out to a hydraulic pump (not shown) is provided.
  • a suction strainer 9 is provided on the upper side (+ z side) of the outlet 101d in order to prevent foreign matter from entering the hydraulic pump. The hydraulic oil stored in the hydraulic oil tank 100 is sucked into a hydraulic pump (not shown) via the suction strainer 9 and supplied again to the hydraulic device.
  • Suction strainer 9 has a substantially cylindrical filter medium.
  • the filter medium is, for example, a metal plate-like member in which a large number of holes are formed, and is formed into a substantially cylindrical shape by connecting both ends and rounding into a cylindrical shape.
  • the side surface 101e of the tank body 101 is provided with an inflow pipe 102 that allows hydraulic oil to flow into the tank body 101.
  • the inflow pipe 102 passes through the tank body 101, and the hydraulic oil is guided to the return filter 1 through the inflow pipe 102.
  • the hydraulic oil is filtered by the return filter 1 and stored in the hydraulic oil tank 100.
  • FIG. 2 is a perspective view showing an outline of the return filter 1 and is a view showing a state cut along a plane along the central axis A.
  • FIG. 2 is a perspective view showing an outline of the return filter 1 and is a view showing a state cut along a plane along the central axis A.
  • the return filter 1 mainly includes a filter case 10, a lid member 20, a filter element 30, a lower case 40, and a rectifying member 50.
  • the filter case 10 is a substantially cylindrical member and is made of metal.
  • the upper end of the filter case 10 is provided on the lid member 20, and the lower end of the filter case 10 is provided on the lower case 40.
  • a plurality of holes 10 a and 10 b through which hydraulic oil passes are formed on the side surface of the filter case 10.
  • the hole 10a is an outflow portion that communicates the space S2 between the filter case 10 and the filter element 30 and the external space S3 (see FIG. 1).
  • the hole 10 b is an air vent hole provided in the vicinity of the upper end of the filter case 10.
  • the lid member 20 is a member that covers the upper end surface of the filter case 10.
  • the lid member 20 mainly has a first lid 21 and a second lid 22.
  • the first lid 21 and the second lid 22 are integrated by a bolt (not shown).
  • the first lid 21 is a plate-like member that is fixed to the upper side of the upper surface 101a (see FIG. 1), and has a hole 21a formed substantially at the center.
  • the filter case 10 is inserted into the hole 21a.
  • the second lid 22 has a substantially plate-like flange portion 22a and convex portions 22b and 22c.
  • the flange portion 22 a is fixed to the upper side of the first lid 21.
  • the convex portions 22b and 22c are formed so as to protrude downward ( ⁇ z direction) from the flange portion 22a.
  • the convex portion 22 b is inserted into the inner peripheral surface of the filter case 10. As a result, the filter case 10 is sandwiched between the first lid 21 and the second lid 22.
  • the convex portion 22 c is provided on the filter element 30.
  • the filter element 30 is a substantially cylindrical member as a whole, and is provided inside the filter case 10.
  • the filter element 30 mainly includes an inner cylinder 31, an outer cylinder 32, a filter medium 33, and plates 34 and 35.
  • the inner cylinder 31 and the outer cylinder 32 are substantially hollow cylindrical members having openings at both ends.
  • the inner cylinder 31 and the outer cylinder 32 are formed using a highly corrosion-resistant material (metal or resin).
  • the inner cylinder 31 is provided inside the filter medium 33, and the outer cylinder 32 is provided outside the filter medium 33.
  • the inner cylinder 31 covers the periphery of the rectifying member 50 (described in detail later) and contacts the inner peripheral surface of the filter medium 33.
  • the lower end of the inner cylinder 31 is substantially the same as the lower end of the filter medium 33 in the height direction.
  • the height of the inner cylinder 31 is lower than the height of the filter medium 33 (here, less than half the height of the filter medium 33).
  • the hole 10a is formed at a position overlapping the inner cylinder 31 in the height direction (z direction).
  • the height of the outer cylinder 32 is substantially the same as the height of the filter medium 33.
  • the outer cylinder 32 is formed with a large number of holes 32a through which the hydraulic oil passes substantially throughout.
  • the filter medium 33 is for filtering the hydraulic oil and has a substantially cylindrical shape having a thickness in the radial direction.
  • the filter medium 33 is formed by folding a filter paper made of synthetic resin, paper, or the like, and connecting both ends of the filter paper folded and rounding it into a cylindrical shape.
  • a plate 34 is provided at one end of the filter medium 33, and a plate 35 is provided at the other end.
  • the plate 34 and the plate 35 are members having a substantially disc shape or a bottomed substantially cylindrical shape, and are formed using resin or metal.
  • the plate 34 covers the lower ends of the inner cylinder 31, the outer cylinder 32 and the filter medium 33.
  • the plate 34 is provided in the inflow part 41 (detailed later).
  • the plate 35 covers the upper ends of the outer cylinder 32 and the filter medium 33.
  • the convex portion 22 c is fitted into the hollow portion 35 a of the plate 35.
  • the filter element 30 is provided inside the filter case 10.
  • the lower case 40 is a member that allows fluid to flow into the hollow portion (space S1) of the filter element 30, and has a substantially cylindrical inflow portion 41 that covers the lower end of the filter case 10.
  • the inflow portion 41 is formed with a substantially cylindrical hole 41b that opens to the upper end surface 41a, and a tubular portion 41d that both ends open to the side surface of the inflow portion 41 and the side surface of the hole 41b.
  • the tubular portion 41d communicates the hole 41b and the external space S3.
  • a valve 42 is provided on the bottom surface of the substantially cylindrical hole 41b.
  • the valve 42 opens and closes according to the difference between the pressure in the space S1 and the pressure in the external space S3. Since the valve 42 can use a known technique, a detailed description thereof is omitted.
  • the valve 42 is not essential.
  • FIG. 3 is a view in which the inflow portion 41 is cut along the central axis A.
  • FIG. 4 is a view of the inflow portion 41 cut along the line B (see FIGS. 2 and 3). 3 and 4 indicate the flow of hydraulic oil.
  • the upper end surface 41a is formed with a hole 41f into which the lower end of the filter case 10 is inserted and a hole 41g into which the plate 35 is inserted.
  • the hole 41b has a small diameter portion 41e.
  • the hole 41g is formed around the small diameter portion 41e.
  • the tubular portion 41d mainly has a substantially cylindrical round hole portion 41h that opens to the side surface 41c, and a connecting portion 41i that connects the round hole portion 41h and the hole 41b.
  • the round hole portion 41h is an opening in which the inflow pipe 102 is provided, and is provided at a position where the central axis A1 of the round hole portion 41h intersects the central axis A in a plan view (when viewed from the z direction).
  • the connecting portion 41i is inclined with respect to the round hole portion 41h in plan view.
  • the central axis A2 of the connecting portion 41i is inclined by approximately 30 degrees to approximately 45 degrees with respect to the central axis A1 in plan view.
  • the channel area of the connecting portion 41i gradually decreases as it approaches the hole 41b. Therefore, the flow rate of the hydraulic oil when flowing into the hole 41b from the connecting portion 41i is faster than the flow rate of the hydraulic oil flowing through the inflow pipe 102.
  • a swirl flow is easily generated in the hydraulic oil, and bubbles are easily collected in the center of the swirl flow.
  • the rectifying member 50 is a member provided in the hollow portion of the filter element 30 (here, the inner cylinder 31), and rectifies the flow of hydraulic oil from the swirl flow to the upward flow.
  • FIG. 5 is a CC cross-sectional view of the return filter 1.
  • the rectifying member 50 has a plurality of plate-like portions 51 provided along the central axis A.
  • the four plate-like portions 51 are provided so as to have a substantially cross shape in plan view.
  • the hydraulic oil flows between the inner cylinder 31 and the plate-like part 51.
  • the plate-like portion 51 and the inner cylinder 31 are provided along the central axis A. The flow is rectified into a flow in the direction along the plate-like portion 51 (here, upward).
  • the rectifying member 50 is provided near the lower end of the filter element 30. As a result, the hydraulic oil flowing into the space S1 from the hole 41b can be rectified at the earliest possible stage. Further, since the periphery of the rectifying member 50 is covered by the inner cylinder 31, the inner cylinder 31 prevents the operating oil before rectification from flowing to the filter medium 33, and only the rectified hydraulic oil is filtered by the filter medium 33. Thereby, the fall of the filtration performance by a swirl flow can be prevented.
  • the rectifying member 50 has four plate-like portions 51, but the number of plate-like portions 51 may be plural. Further, the shape of the plate-like portion 51 is not limited to the illustrated form. For example, the four plate-like parts 51 may be in contact with only the inner cylinder 31 and the substantially cross-shaped central part may be hollow.
  • FIGS. 1 to 4 indicate the flow of hydraulic oil.
  • Hydraulic oil is flowing in the hydraulic circuit during operation of the hydraulic system. As shown in FIG. 1, the hydraulic oil flows into the inflow portion 41 through the inflow pipe 102. As shown in FIG. 2, the hydraulic oil has a high flow velocity while passing through the tubular portion 41 d and swirls inside the hole 41 b. As a result, the air contained in the hydraulic oil collects in the center of the vortex.
  • the hydraulic oil is filtered by flowing from the inside to the outside of the filter medium 33, and the filtered hydraulic oil flows out into the space S2 through the holes 32a.
  • the filter medium 33 by the inner cylinder 31 Since only the rectified hydraulic oil is filtered by the filter medium 33 by the inner cylinder 31, it is possible to prevent a decrease in filtration performance due to the swirling flow. Moreover, since the height of the inner cylinder 31 is half or less of the height of the filter medium 33, the fall of the filtration performance by the inner cylinder 31 can be suppressed. Further, the hydraulic oil can be filtered using the entire filter medium 33 by forming the hole 10a at a position overlapping the inner cylinder 31 in the height direction.
  • the filtered hydraulic oil flows downward in the space S2. And as shown in FIG. 1, it flows out out of the space S2 to the external space S3 through the hole 10a which is an outflow part.
  • the air that has flowed into the space S1 floats toward the oil level L (see FIG. 1), and is discharged out of the filter case 10 through the hole 10b.
  • the tubular portion 41d has the round hole portion 41h provided at a position where the central axis A1 intersects the central axis A, so that it remains compatible with the conventional filter device, A swirling flow can be generated inside the inflow portion 41 to remove air from the liquid.
  • the center axis of the return filter 1 and the center axis of the suction strainer 9 coincide, but the position of the suction strainer 9 is not limited to this.
  • the central axis of the return filter 1 and the central axis of the suction strainer 9 are used. It is desirable to match.
  • the connecting portion 41i is a substantially straight pipe, and the central axis A2 is inclined by approximately 30 to 45 degrees with respect to the central axis A1, but the shape of the connecting portion 41i is limited to this. Absent.
  • the connecting portion may be a curved pipe.
  • the wall surface of the connecting portion may be in contact with the side surface of the hole 41b at the point P.
  • the height of the inner cylinder 31 is less than or equal to half the height of the filter medium 33, but the height of the inner cylinder 31 only needs to be lower than the height of the filter medium 33. However, it is desirable that the height of the inner cylinder 31 be as low as possible and at least half the height of the filter medium 33 so as not to deteriorate the filtration performance.
  • substantially is a concept that includes not only exactly the same but also errors and deformations that do not lose the identity.
  • substantially orthogonal is not limited to being strictly orthogonal, and is a concept including an error of, for example, several degrees. Further, for example, when simply expressing as orthogonal, parallel, coincidence, etc., not only strictly orthogonal, parallel, coincidence, etc. but also cases of substantially parallel, substantially orthogonal, substantially coincidence, etc. are included.
  • neighboring means including an area in a certain range (which can be arbitrarily determined) near the reference position.
  • a certain range which can be arbitrarily determined

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtration Of Liquid (AREA)
  • Power Steering Mechanism (AREA)
  • Degasification And Air Bubble Elimination (AREA)

Abstract

La présente invention est apte à supprimer un écoulement rotationnel à proximité d'un matériau filtrant tout en éliminant l'air inclus dans un liquide et généré par l'écoulement rotationnel. L'intérieur du boîtier de filtre 10 est pourvu d'un élément filtrant 30 ayant un matériau filtrant sensiblement cylindrique 33, et un cylindre interne sensiblement cylindrique 31 qui entre en contact avec la surface circonférentielle interne du matériau filtrant 31et est plus court que la hauteur du matériau filtrant 33. Une partie d'admission 41 pour recouvrir l'extrémité inférieure du boîtier de filtre 10 a un trou sensiblement cylindrique 41b formé à l'intérieur de celui-ci qui est ouvert au niveau de la surface d'extrémité supérieure de celui-ci. Une partie en forme de tube 41d, dont les deux extrémités s'ouvrent sur la surface latérale de la partie d'admission 41 et la surface latérale du trou 41b, amène le fluide à s'écouler à l'intérieur du trou 41b à partir de la direction tangentielle à un point souhaité le long de la surface latérale du trou 41b. La section creuse du cylindre interne 31 est pourvue d'un élément de redressement d'écoulement 50 qui a une pluralité de parties en forme de plaque disposées le long d'un premier axe central A. Les emplacements dans la direction de hauteur de l'extrémité inférieure du matériau filtrant 33 et de l'extrémité inférieure du cylindre interne 31 sont sensiblement identiques, et l'élément de redressement d'écoulement 50 est disposé à proximité de l'extrémité inférieure de l'élément filtrant 30.
PCT/JP2018/015878 2017-04-20 2018-04-17 Dispositif de filtrage Ceased WO2018194060A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-084012 2017-04-20
JP2017084012A JP6866216B2 (ja) 2017-04-20 2017-04-20 フィルタ装置

Publications (1)

Publication Number Publication Date
WO2018194060A1 true WO2018194060A1 (fr) 2018-10-25

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Application Number Title Priority Date Filing Date
PCT/JP2018/015878 Ceased WO2018194060A1 (fr) 2017-04-20 2018-04-17 Dispositif de filtrage

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JP (1) JP6866216B2 (fr)
WO (1) WO2018194060A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113766961A (zh) * 2019-03-20 2021-12-07 Smc株式会社 过滤器元件

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3486306A (en) * 1968-04-05 1969-12-30 Joseph J Blackmore Liquid downflow air purging means for a vortex type de-aerator and the like
JPH01104315A (ja) * 1987-07-30 1989-04-21 Mitsubishi Oil Co Ltd 原動機または油圧機器における潤滑油中の固体および気体異物の一体型分離除去装置
JP2000042312A (ja) * 1998-07-28 2000-02-15 Asahi Kikai Seisakusho:Kk 濾過方法および濾過装置
JP2006142261A (ja) * 2004-11-24 2006-06-08 Takeo Yoshida 濾過器
JP3123449U (ja) * 2005-12-12 2006-07-20 協伸工業株式会社 螺旋流入式ストレーナ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3486306A (en) * 1968-04-05 1969-12-30 Joseph J Blackmore Liquid downflow air purging means for a vortex type de-aerator and the like
JPH01104315A (ja) * 1987-07-30 1989-04-21 Mitsubishi Oil Co Ltd 原動機または油圧機器における潤滑油中の固体および気体異物の一体型分離除去装置
JP2000042312A (ja) * 1998-07-28 2000-02-15 Asahi Kikai Seisakusho:Kk 濾過方法および濾過装置
JP2006142261A (ja) * 2004-11-24 2006-06-08 Takeo Yoshida 濾過器
JP3123449U (ja) * 2005-12-12 2006-07-20 協伸工業株式会社 螺旋流入式ストレーナ

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113766961A (zh) * 2019-03-20 2021-12-07 Smc株式会社 过滤器元件
CN113766961B (zh) * 2019-03-20 2023-04-04 Smc株式会社 过滤器元件
US11980839B2 (en) 2019-03-20 2024-05-14 Smc Corporation Filter element

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JP2018176134A (ja) 2018-11-15
JP6866216B2 (ja) 2021-04-28

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