WO1988003047A1 - Filter for hydraulic systems having packing with constant side action for the screw-on cartridge unit and having a glogging indicator responding to differentiated pressure - Google Patents
Filter for hydraulic systems having packing with constant side action for the screw-on cartridge unit and having a glogging indicator responding to differentiated pressure Download PDFInfo
- Publication number
- WO1988003047A1 WO1988003047A1 PCT/IT1986/000091 IT8600091W WO8803047A1 WO 1988003047 A1 WO1988003047 A1 WO 1988003047A1 IT 8600091 W IT8600091 W IT 8600091W WO 8803047 A1 WO8803047 A1 WO 8803047A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- head
- filter
- hydraulic systems
- clogging
- seat
- Prior art date
Links
- 238000012856 packing Methods 0.000 title claims abstract description 18
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 5
- 239000012530 fluid Substances 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 230000000007 visual effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 2
- 108091006146 Channels Proteins 0.000 claims 4
- 239000000956 alloy Substances 0.000 claims 1
- 229910045601 alloy Inorganic materials 0.000 claims 1
- 230000000284 resting effect Effects 0.000 claims 1
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 241000282326 Felis catus Species 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D27/00—Cartridge filters of the throw-away type
- B01D27/08—Construction of the casing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
- B01D35/143—Filter condition indicators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/30—Filter housing constructions
- B01D35/306—Filter mounting adapter
Definitions
- the packing between cartridge holder and the head fixed to pipes supplying the system is generally placed at the front in relation to coupling surfaces and its action therefore gen ⁇ erally takes place in the same direction as that in which the cartridge is screwed on.
- Subject of the invention is a filter for hydraulic systems, consisting os a replaceable cartridge whose holder is screwed onto the head to be mounted on the down piping, comprising an annular packing acting transversally in relation to the screw ing direction, and a clogging detector .sensitive to differen ⁇ ces in pressure upstream and downstream of the head. Due to its independence from screwing play and from any irre ⁇ gularity in this process, packing so placed avoids leaks and passage of fluid between head and cartridge holder, also en ⁇ suring precision in operation of the detector.
- the head comprises an annular seat communicating with the fluid input aperture and an internal threaded connector , coaxial to the annular seat, communicating with the fluid out let aperture.
- the container comprises a small axial head having a cylindri- neck matching with the above annular head, and a central threaded hole for fluid outflow, coaxial to said neck, made to allow the head .connector to be screwed on.
- the above invented annular packing is placed between the in- ner cylindrical face of the annular seat of the head, and the outer cylindrical faces of the neck on the small head of the container.
- the container is made of steel and is fixed to the small head by its edge being bent back, preferably * to form an over- turned "U", round the outer raised rim of the small head so as to create a hermetic, stable and secure seal.
- the small head is die-cast and is preferably of aluminium or aluminium alloys.
- the clogging detector comprises a cylindrical body in whose cylindrical seat on the head there are two chambers, a front one communicating by a small channel with the outlet aper ⁇ ture of the head, and an inner annular chamber communicating by another small channel with the inlet aperture of the head.
- a piston sliding inside said cylindrical body also creates two chambers, a front one communicating with the front cham ber of the detector's cylindrical seat, and an inner annu ⁇ lar one communicating by means of a small channel with the annular chamber of said cylindrical seat.
- a spring pushes the piston towards the back end of the detector.
- the warning is made by means of a slider moving freely in a longitudinal direction outside the body of the detector to which a permanent magnet is fixed.
- Polarities of said magnets, on the opposing faces, are equal.
- One half of the slider is green and the other half red.
- the slider When moved to its end-stroke position, denoting a clogged filter, the slider works a switch that closes the electric circuit operating a visual or an acoustic warning. Characteristics and purposes of the invention will be made still clearer by the examples of its application here fol ⁇ lowing illustrated by drawings.
- FIG. 1 Side view of the head, partially exposed.
- Fig. 2 Replaceable cartridge with container.
- Fig. 3 The filter mounted and in a clogged condition.
- the head (10) is connected to the hydraulic system by .means of the inflow aperture (11) and outflow aperture (12).
- Aperture (11) communicates with the annular seat (13) pro ⁇ vided with the channel (14) for the packing (15).
- Aperture (12) communicates with the outer threaded connec ⁇ tion (16), axial to the seat (13) and concentric to it.
- the cartridge (25), Figs. 2, 3, is mounted in the cylindri cal steel container (26) with small die-cast discoid head (27).- " having an axial neck (28), a series of circular holes (29) set radially for fluid inflow, and a central internal ⁇ ly threaded hole (30) for screwing onto the connection (16) of the head.
- the steel container (26) is fixed to the small head (27) by said container's edge (31) being bent back, to form an over turned "IT", all round the outer upward facing rim (32) of said small head, thus creating a hermetic, stable and se ⁇ cure seal.
- the aperture (11) in the head communicates with chamber(18) by means of the channel (20) while aperture (12) communi- cates with the chamber (19) by means of channel (21).
- the detector (40) comprises the cylindrical body (41 ) with its threading (42) to allow it to screw on to the threaded seat (22) of the top (17) of the head, with its tubular end (43) and packing (44).
- the piston (45) slides inside the cylindrical body and is held down on the bottom of the body (41) by the calibrated compression spring (46) which at the front connects to the locking ring (47) .
- the permanent magnet (48) is fixed to the back end of the piston.
- An annular slider can. slide axially on the outer cylindri ⁇ cal surface of the body (41) , a permanent annular magnet being fixed to said slider which consists of two halves, one red (50) and the other green (49).
- the magnets (48) and (51) lie opposite one another and their polarities .are of the same sign.
- the annular packing ( 60 ) on the piston (45) creates the front chamber (43) communicating with the chamber (19) in the cylindrical seat (22) of the head, and the annular in ⁇ ner chamber (61) communicating by means of the small chan ⁇ nel (62) with the annular chamber (18) in the above seat.
- the head (10) is installed by connecting the apertures (11) and (12) respectively with the delivery and return pipes.
- the container (26) with cartridge (25) is mounted on the head by screwing the threaded hole (30) onto the connector (16).
- the packing (1 ) is placed to fit against the outer faces (33) of the neck (28) of the container ensuring its seal.
- pressure A in the cham ⁇ ber (61) communicating through the small tube (62) with the chamber (18), which in turn communicates with the fluid upstream of the filter, is less than overall pressure B which includes the pressure of fluid in chamber (19), com ⁇ municating with the fluid downstream of the filter, plus the tension of the spring (46) .
- the green half (49) of the slider lies in view behind the transparent window '' (53) of the ring (52).
- Seal pressure is independent both of the force applied to screwing on the cartridge holder and of its axial position.
- Working pressure can therefore reach values many times higher than that obtainable with ordinary filters having packing squeezed frontally.
- the differentiated pressure clogging detector indicates values that are perfectly correct in relation to calibra- tion of the spring, since the packing between cartridge holder and the head ensures a constant seal being affected neither by any play nor by irregularities in the way the holder is screwed on.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Fluid-Pressure Circuits (AREA)
- Filtration Of Liquid (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI891908A FI891908A0 (en) | 1986-10-22 | 1989-04-21 | FILTER FOER HYDRAULIC SYSTEM, FOERSETT MED EN PACKNING MED KONSTANT TAETNINGSVERKAN I SIDLED FOER EN PAOSKRUVBAR PATRONENHET SOM AER FOERSEDD MED EN TILL TRYCKFOERAENDRINGAR REAGERANDE BLOCKERINGSINDIKATOR. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT8622083A IT1213509B (en) | 1986-10-22 | 1986-10-22 | FILTER FOR HYDRAULIC WITH CLOGGING INDICATOR DIFFERENT IN PRESSURE AND GASKET WITH CONSTANT LATERAL ACTION FOR THE SCREWABLE CARTRIDGE. |
IT22083A/86 | 1986-10-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1988003047A1 true WO1988003047A1 (en) | 1988-05-05 |
Family
ID=11191238
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IT1986/000091 WO1988003047A1 (en) | 1986-10-22 | 1986-12-11 | Filter for hydraulic systems having packing with constant side action for the screw-on cartridge unit and having a glogging indicator responding to differentiated pressure |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0330651A1 (en) |
FI (1) | FI891908A0 (en) |
IT (1) | IT1213509B (en) |
WO (1) | WO1988003047A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2786868A1 (en) * | 1998-12-02 | 2000-06-09 | Manuli Auto France | Pressure sensor assembly for vehicle air conditioning, comprises pressure containing wall with cavity for housing pressure sensor which is secured and made watertight by crimped lip and ring joint at base |
EP1479426A1 (en) * | 2003-05-21 | 2004-11-24 | Levitronix LLC | Filter device and method for indicating the condition of the filter element |
EP1671690A2 (en) | 2004-12-16 | 2006-06-21 | Mann+Hummel Gmbh | Liquid filter |
FR2911796A1 (en) * | 2007-01-25 | 2008-08-01 | Hispano Suiza Sa | Filter e.g. oil filter, clogging monitoring device for e.g. jet prop engine of aircraft, has rod carrying magnetic core, where position of core is determined from electrical voltage at terminals of electronic circuit connected to coils |
EP3771482A1 (en) * | 2019-07-30 | 2021-02-03 | Dana Motion Systems Italia S.R.L. | Adaptor plug for a spin-on filter |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB879324A (en) * | 1958-10-15 | 1961-10-11 | Bendix Corp | Visible filter clogging indicator |
GB1057855A (en) * | 1962-10-25 | 1967-02-08 | Ct De Rech S Hydrauliques Et E | A filter including a clogging indicator |
US3322279A (en) * | 1965-07-15 | 1967-05-30 | Bendix Corp | Filter condition indicator device |
US3325015A (en) * | 1964-07-20 | 1967-06-13 | Walker Mfg Co | Filter seal |
FR1490916A (en) * | 1966-08-29 | 1967-08-04 | Full flow oil filter, especially for internal combustion engines | |
US3375720A (en) * | 1966-02-10 | 1968-04-02 | Michigan Dynamics Inc | Differential pressure indicator |
-
1986
- 1986-10-22 IT IT8622083A patent/IT1213509B/en active
- 1986-12-11 EP EP87900253A patent/EP0330651A1/en not_active Withdrawn
- 1986-12-11 WO PCT/IT1986/000091 patent/WO1988003047A1/en not_active Application Discontinuation
-
1989
- 1989-04-21 FI FI891908A patent/FI891908A0/en not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB879324A (en) * | 1958-10-15 | 1961-10-11 | Bendix Corp | Visible filter clogging indicator |
GB1057855A (en) * | 1962-10-25 | 1967-02-08 | Ct De Rech S Hydrauliques Et E | A filter including a clogging indicator |
US3325015A (en) * | 1964-07-20 | 1967-06-13 | Walker Mfg Co | Filter seal |
US3322279A (en) * | 1965-07-15 | 1967-05-30 | Bendix Corp | Filter condition indicator device |
US3375720A (en) * | 1966-02-10 | 1968-04-02 | Michigan Dynamics Inc | Differential pressure indicator |
FR1490916A (en) * | 1966-08-29 | 1967-08-04 | Full flow oil filter, especially for internal combustion engines |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2786868A1 (en) * | 1998-12-02 | 2000-06-09 | Manuli Auto France | Pressure sensor assembly for vehicle air conditioning, comprises pressure containing wall with cavity for housing pressure sensor which is secured and made watertight by crimped lip and ring joint at base |
EP1479426A1 (en) * | 2003-05-21 | 2004-11-24 | Levitronix LLC | Filter device and method for indicating the condition of the filter element |
EP1671690A2 (en) | 2004-12-16 | 2006-06-21 | Mann+Hummel Gmbh | Liquid filter |
FR2911796A1 (en) * | 2007-01-25 | 2008-08-01 | Hispano Suiza Sa | Filter e.g. oil filter, clogging monitoring device for e.g. jet prop engine of aircraft, has rod carrying magnetic core, where position of core is determined from electrical voltage at terminals of electronic circuit connected to coils |
EP3771482A1 (en) * | 2019-07-30 | 2021-02-03 | Dana Motion Systems Italia S.R.L. | Adaptor plug for a spin-on filter |
US11491427B2 (en) | 2019-07-30 | 2022-11-08 | Dana Motion Systems Italia S.R.L. | Adaptor plug for a spin-on filter |
Also Published As
Publication number | Publication date |
---|---|
EP0330651A1 (en) | 1989-09-06 |
FI891908A (en) | 1989-04-21 |
IT8622083A0 (en) | 1986-10-22 |
FI891908A0 (en) | 1989-04-21 |
IT1213509B (en) | 1989-12-20 |
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