WO2009155945A1 - Fluidic device - Google Patents
Fluidic device Download PDFInfo
- Publication number
- WO2009155945A1 WO2009155945A1 PCT/EP2008/005198 EP2008005198W WO2009155945A1 WO 2009155945 A1 WO2009155945 A1 WO 2009155945A1 EP 2008005198 W EP2008005198 W EP 2008005198W WO 2009155945 A1 WO2009155945 A1 WO 2009155945A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- piston
- fluid
- fibers
- fiber material
- june
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
- F15B15/1452—Piston sealings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0401—Valve members; Fluid interconnections therefor
- F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1457—Piston rods
- F15B15/1461—Piston rod sealings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
- F16J15/3288—Filamentary structures, e.g. brush seals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/56—Other sealings for reciprocating rods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
- F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
- F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides
- F16K11/0712—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides comprising particular spool-valve sealing means
Definitions
- the invention relates to a fluid power device, comprising a housing which has at least one piston receptacle in which at least one piston is mounted axially displaceable, wherein between a peripheral side of the piston and the inner side of the piston receiving side facing the circumferential side fluid-tight, sealing the piston enclosing sealant are arranged.
- Such a fluidic device in the form of a valve device is known for example from EP 1 564 458, wherein here a valve spool is provided, which is associated with a sealing device having a plurality of elastomer sealing elements.
- the elastomer sealing elements each have an inner sealing area, which serves as a dynamic sealing edge for sealing against the valve spool.
- Sealing edge is the friction between the sealing element and the associated movable component, in this case the
- the object of the invention is to provide a fluid power device of the type mentioned, which is reliable compared to conventional fluid power devices and less susceptible to wear.
- the fluidic device according to the invention is characterized in that the piston and / or the inner side of the piston receptacle facing the piston is provided with fiber material for forming the sealing means.
- a brush seal arrangement for a fluid power device in the form of a pump is already known from WO 03/036097 A1
- the brush seal arrangement is used for sealing the annular gap between a rotating component in the form of a shaft and a stationary housing.
- the piston can be provided peripherally with fiber material.
- the inside of the piston receptacle facing the piston can be provided with fiber material.
- the fibrous material may extend substantially substantially the entire axial length of the piston.
- the piston is provided with fiber material in the axial direction. It is also possible to provide a plurality of partial regions of the piston arranged one behind the other in the axial direction at a distance from one another with fiber material.
- fiber material natural and / or synthetic fibers can be used.
- synthetic fibers these may be man-made fibers, in particular polymer fibers, or industrial fibers, for example glass fibers and / or carbon fibers and / or metal fibers.
- the fiber material is formed by staple fibers.
- the fiber material is formed by relatively movable fibers.
- the fibers may each have a first end fixedly connected to the piston or the piston receptacle and a piston receptacle assigned to the piston or of the piston.
- the fibers can thus be arranged like mats, for example, fibers from the piston in the radial direction, directed towards the piston receiving point, protrude.
- the fiber material is formed by bristles.
- the bristles may be part of at least one brush element that is material or form-fitting connected to the piston and / or the piston receptacle.
- the fiber material is formed from flock fibers, with which the piston and / or the piston receptacle is flocked.
- the sealing means have sealing fluid which is incorporated in intermediate spaces between the fiber material.
- the sealing fluid has a relatively high viscosity, whereby it reliably holds in the interstices.
- the piston has at least one circumferentially extending guide band for guidance in the associated piston receptacle.
- lateral forces can be absorbed so that they do not have to be absorbed by the fiber material.
- the dimensioning of the fibers of the fiber material for example, the choice of the appropriate fiber diameter or the fiber length, regardless of acting on the piston transverse forces can be made.
- the fluid power device is a fluidic linear drive. It can be used with at least one piston rod stocked or rodless linear drives. It is possible, for example, to use a pneumatic working cylinder, in particular, whose piston receptacle is subdivided by the piston into two working chambers, at least one of which can be acted upon by pressure medium, in particular compressed air, the working chambers being formed via the sealing material formed from fibrous material, optionally with addition sealing fluid, fluid-tight, in particular airtight sealed from each other.
- a pneumatic working cylinder in particular, whose piston receptacle is subdivided by the piston into two working chambers, at least one of which can be acted upon by pressure medium, in particular compressed air, the working chambers being formed via the sealing material formed from fibrous material, optionally with addition sealing fluid, fluid-tight, in particular airtight sealed from each other.
- the fluid-technical device prefferably be a valve and for the piston to be formed by a valve piston designed in particular as a valve slide.
- the piston receptacle can be formed directly by a housing recess formed in the housing, which is bounded by the housing wall, or by a component mounted fixedly in the housing, for example in the form of a seal arrangement in which the piston is movably mounted.
- FIG. 1 is a schematic illustration, shown in longitudinal section, of a first exemplary embodiment of the fluid power device according to the invention in the form of a fluidic working cylinder;
- FIG. 2 is a schematic representation, shown in longitudinal section, of a second exemplary embodiment of the fluid power device according to the invention in the form of a valve;
- Figure 3 is an enlarged view of the detail X of Figure 1, in which case the flock fibers are shown significantly enlarged.
- the fluidic device 11 is shown by way of example in the form of a fluidic working cylinder.
- the working cylinder has a cylinder housing 12 with a housing recess 13 in which a piston 14 is mounted so as to be axially displaceable.
- the working cylinder is exemplified in the form of a double-acting pneumatic cylinder, wherein the piston 14, the housing recess 13 into two working chambers 15a, 15b divided, each of which can be acted upon with compressed air.
- the piston can be moved back and forth in the axial direction.
- the piston is also connected to a piston rod 16, which is guided out of the cylinder housing 12 via a housing cover 17.
- An interface (not shown) is located on the piston rod 16, via which the linear movement generated as a result of the compressed-air application of the piston 14 can be picked up.
- the sealing means 20 arranged.
- the peripheral side 18 of the piston 14 is flocked with fibrous material in the form of flock fibers.
- the flocking is of course arranged around the piston 14, in which case only a portion of the total length of the piston 14 is flocked in the axial direction. It is of course possible to flock a plurality of axially adjacent portions of the piston 14.
- the piston 14 can be provided on the circumference with a guide band 29 (dash-dotted representation).
- a guide tape is not necessarily necessary.
- Fibrous fibers are chemical fibers, in particular polymer fibers and / or industrial fibers, for example glass fibers and / or carbon fibers and / or metal fibers.
- continuous filaments of flock fiber material for example metal, preferably steel, and / or polymer material, for example polyamide, are cut to the appropriate cutting lengths.
- the cut lengths of such flock fibers can range from 0.01 mm to 20 mm in length. Typical cutting lengths are in the range of 0.5 mm to 5 mm.
- the diameter of the flock fibers may be in the range of a few ⁇ meters, for example 4 to 15 ⁇ meters.
- Lengths and fiber diameters of the flat fibers can vary within a wide range, in particular flocking is possible in which flock fibers of different cutting lengths and fiber diameter are combined with one another.
- flock fibers are first charged in a flock emitter and then fly along the field lines of a strong electrostatic field in the direction of the peripheral side of the piston and / or inside of the piston receiver prepared with a binder, in particular flock adhesive.
- the flock fibers can be applied at any angle to the peripheral side of the piston 14, but preferably they are substantially perpendicular to the peripheral side 18.
- flock adhesives are, for example, aqueous dispersion adhesive, in particular 2-component adhesive, for example polyurethane two-component -Glue .
- hot melt adhesive as the flock adhesive, in particular in the form of a thermoplastic or a hot-melt foil.
- the fibers are each adhesively bonded to the piston 14 with a first end 30, while the second end 31 is oriented towards the inside of the housing recess and is freely movable.
- FIG. 1 also shows the situation that the passage of the piston rod 16 is sealed by further sealing means 22.
- fiber material in the form of flock fibers is also used to form the further sealant.
- the flock fibers 23 are shown once more in an enlarged view.
- the flock fibers can have an increased roughness on their outer side, whereby an additional surface is created, which contributes to the fluid-tight sealing of the two working chambers 15a, 15b.
- Between adjacent flock fibers 23 are intermediate spaces 24, which are at least partially filled by a sealing fluid 25.
- sealing fluid is a liquid with high viscosity.
- the bristles 35 are part of a plurality of brush elements 36, of which a single example is shown.
- the brush elements have a base body 37 to which the individual bristles are attached.
- the base body in turn is positively connected, for example in a groove-like recess (not shown), attached to the piston 14.
- the sealing of the passage of the piston rod can be realized by brush elements.
- FIG. 2 shows a second exemplary embodiment of the fluid power device 11 according to the invention.
- a valve is provided here, with a valve housing 26 in which a piston receptacle 13 is in the form of a sealing device mounted in a housing recess of the valve housing.
- a valve slide 27 Within the piston receiving a valve slide 27 is mounted axially displaceable, wherein the valve spool control sections 28a, 28b has small and large diameter.
- sealing means 20 are formed by fiber material in the form of flock fibers 23.
- the sealing means 20 are characterized in that compared to conventional sealant in the form of elastomer sealing elements substantially less friction between the relatively movable components, ie the Piston 14 and the piston receiving occurs. Furthermore, the so-called “stick-slip effect” is prevented, since even with prolonged downtime of the piston 14 and the valve spool 27 due to the formed of fiber material, in particular flock fibers or bristles sealant no increased static friction between the relatively moving components occurs.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2008/005198 WO2009155945A1 (en) | 2008-06-26 | 2008-06-26 | Fluidic device |
DE112008003894T DE112008003894A5 (en) | 2008-06-26 | 2008-06-26 | Fluid technical device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2008/005198 WO2009155945A1 (en) | 2008-06-26 | 2008-06-26 | Fluidic device |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009155945A1 true WO2009155945A1 (en) | 2009-12-30 |
Family
ID=40469811
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2008/005198 WO2009155945A1 (en) | 2008-06-26 | 2008-06-26 | Fluidic device |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE112008003894A5 (en) |
WO (1) | WO2009155945A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103016444A (en) * | 2012-12-31 | 2013-04-03 | 浙江工业大学 | Air-suspending friction-free air cylinder with cylinder barrels for air supply |
CN103016445A (en) * | 2012-12-31 | 2013-04-03 | 浙江工业大学 | Air-suspending frictionless cylinder with pressure equalizing type gas unloading groove |
CN103047220A (en) * | 2012-12-31 | 2013-04-17 | 浙江工业大学 | Cylinder barrel air supply pressure equalizing air floatation friction-free air cylinder |
DE102020200800A1 (en) | 2020-01-23 | 2021-07-29 | Robert Bosch Gesellschaft mit beschränkter Haftung | Arrangement of an electrical machine |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0471073A1 (en) * | 1990-03-06 | 1992-02-19 | Hitachi Construction Machinery Co., Ltd. | Cylinder device |
WO2000053950A1 (en) * | 1999-03-08 | 2000-09-14 | Lord Corporation | Controllable pneumatic apparatus including matrix medium retaining structure and braking devices utilized therein |
WO2003036097A1 (en) * | 2001-10-22 | 2003-05-01 | Sulzer Pumpen Ag | Pump for conveying fluids and mixtures of fluids |
-
2008
- 2008-06-26 WO PCT/EP2008/005198 patent/WO2009155945A1/en active Application Filing
- 2008-06-26 DE DE112008003894T patent/DE112008003894A5/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0471073A1 (en) * | 1990-03-06 | 1992-02-19 | Hitachi Construction Machinery Co., Ltd. | Cylinder device |
WO2000053950A1 (en) * | 1999-03-08 | 2000-09-14 | Lord Corporation | Controllable pneumatic apparatus including matrix medium retaining structure and braking devices utilized therein |
WO2003036097A1 (en) * | 2001-10-22 | 2003-05-01 | Sulzer Pumpen Ag | Pump for conveying fluids and mixtures of fluids |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103016444A (en) * | 2012-12-31 | 2013-04-03 | 浙江工业大学 | Air-suspending friction-free air cylinder with cylinder barrels for air supply |
CN103016445A (en) * | 2012-12-31 | 2013-04-03 | 浙江工业大学 | Air-suspending frictionless cylinder with pressure equalizing type gas unloading groove |
CN103047220A (en) * | 2012-12-31 | 2013-04-17 | 浙江工业大学 | Cylinder barrel air supply pressure equalizing air floatation friction-free air cylinder |
CN103047220B (en) * | 2012-12-31 | 2015-02-18 | 浙江工业大学 | Cylinder barrel air supply pressure equalizing air floatation friction-free air cylinder |
CN103016444B (en) * | 2012-12-31 | 2015-02-25 | 浙江工业大学 | Air-suspending friction-free air cylinder with cylinder barrels for air supply |
CN103016445B (en) * | 2012-12-31 | 2015-02-25 | 浙江工业大学 | Air-suspending frictionless cylinder with pressure equalizing type gas unloading groove |
DE102020200800A1 (en) | 2020-01-23 | 2021-07-29 | Robert Bosch Gesellschaft mit beschränkter Haftung | Arrangement of an electrical machine |
Also Published As
Publication number | Publication date |
---|---|
DE112008003894A5 (en) | 2011-06-01 |
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