EP2673471A2 - Dichtungselement für kreiskolbenmaschine - Google Patents
Dichtungselement für kreiskolbenmaschineInfo
- Publication number
- EP2673471A2 EP2673471A2 EP12700992.6A EP12700992A EP2673471A2 EP 2673471 A2 EP2673471 A2 EP 2673471A2 EP 12700992 A EP12700992 A EP 12700992A EP 2673471 A2 EP2673471 A2 EP 2673471A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- sealing
- seal member
- channel
- sealing element
- rotary piston
- 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.)
- Granted
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 241
- 239000012530 fluid Substances 0.000 claims abstract description 32
- 230000003068 static effect Effects 0.000 claims abstract description 29
- 229920002313 fluoropolymer Polymers 0.000 claims description 17
- 239000004811 fluoropolymer Substances 0.000 claims description 17
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 10
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 10
- 239000004814 polyurethane Substances 0.000 claims description 10
- 229920001577 copolymer Polymers 0.000 claims description 9
- 239000013536 elastomeric material Substances 0.000 claims description 9
- 229920002635 polyurethane Polymers 0.000 claims description 9
- 239000000945 filler Substances 0.000 claims description 5
- 229920002725 thermoplastic elastomer Polymers 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims description 3
- 229920001519 homopolymer Polymers 0.000 claims description 2
- 239000000463 material Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 230000033001 locomotion Effects 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 239000013013 elastic material Substances 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229920001169 thermoplastic Polymers 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 239000004416 thermosoftening plastic Substances 0.000 description 3
- 238000007514 turning Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- -1 perfluoroalkyl vinyl ethers Chemical class 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000002318 adhesion promoter Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- KDFQYGBJUYYWDJ-UHFFFAOYSA-N azane;sodium Chemical compound N.[Na] KDFQYGBJUYYWDJ-UHFFFAOYSA-N 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- UUAGAQFQZIEFAH-UHFFFAOYSA-N chlorotrifluoroethylene Chemical group FC(F)=C(F)Cl UUAGAQFQZIEFAH-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- HCDGVLDPFQMKDK-UHFFFAOYSA-N hexafluoropropylene Chemical group FC(F)=C(F)C(F)(F)F HCDGVLDPFQMKDK-UHFFFAOYSA-N 0.000 description 1
- 229920006258 high performance thermoplastic Polymers 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 229920001643 poly(ether ketone) Polymers 0.000 description 1
- 229920001601 polyetherimide Polymers 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 229920003225 polyurethane elastomer Polymers 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B31/00—Component parts, details, or accessories not provided for in, or of interest apart from, other groups
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C19/00—Sealing arrangements in rotary-piston machines or engines
- F01C19/005—Structure and composition of sealing elements such as sealing strips, sealing rings and the like; Coating of these elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C19/00—Sealing arrangements in rotary-piston machines or engines
- F01C19/10—Sealings for working fluids between radially and axially movable parts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
- F04C15/003—Sealings for working fluid between radially and axially moving parts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
- F04C15/0034—Sealing arrangements in rotary-piston machines or pumps for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
- F04C15/0038—Shaft sealings specially adapted for rotary-piston machines or pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
- F04C27/008—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine
- F04C27/009—Shaft sealings specially adapted for pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C1/00—Rotary-piston machines or engines
- F01C1/02—Rotary-piston machines or engines of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F01C1/063—Rotary-piston machines or engines of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents with coaxially-mounted members having continuously-changing circumferential spacing between them
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C9/00—Oscillating-piston machines or engines
- F01C9/002—Oscillating-piston machines or engines the piston oscillating around a fixed axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
- F05C2225/04—PTFE [PolyTetraFluorEthylene]
Definitions
- the present invention relates to a sealing element for a rotary piston machine for sealing a run in an annular gap, rotatable about a rotation axis lever, wherein the sealing element is rotationally symmetrical with respect to the axis of rotation.
- a rotary piston engine is z. As described in the published patent application DE 10 2007 001 021 AI. This comprises an annular channel, which is curved along an at least partial arc of a circle, and in which a piston can be displaced by pressurization with a fluid in a movement along the circular arc. This movement is transmitted via a lever connected to the piston on a rotary body having a coaxial with the annular channel axis of rotation. With the rotary piston engine, a torque can thus be directly generated by hydraulic forces, in contrast to a conventional hydraulic piston, which generates a linear force.
- the lever is designed as a substantially circular traction sheave, which rotates with the piston about the axis of rotation and the edge region is guided in an annular gap in the wall of the annular channel.
- this annular gap must extend over the entire length of the circular arc which is to be available for a movement of the piston, ie in extreme cases along the entire circumference of a circle.
- This places high demands on the required sealing of the annular channel against leakage of the hydraulic fluid between the walls of the annular channel and the lever.
- the tightness must be ensured both in the static state (stop of the piston and the lever) and in the dynamic state (movement of the piston and the lever) as well as under pressure. be guaranteed different pressures of the hydraulic fluid, which may typically be up to about 150 bar.
- the sealing element of the aforementioned type in that the sealing element comprises a dynamic range and a static range
- the dynamic range has an axial sealing surface facing the annular gap, and a radial sealing surface facing the interior of an annular channel surrounding the annular gap of the rotary piston engine;
- the static region is used for fixing the sealing element to the rotary piston machine, and wherein in the static region, a channel is formed, which is acted upon by a fluid.
- two sealing elements For sealing the lever of a rotary piston engine two sealing elements according to the invention are respectively provided, which are arranged on opposite sides of the annular gap and abut the axial sealing surfaces on opposite surfaces of the disc-shaped lever.
- the sealing elements are fixed to the rotary piston engine by e.g. are received in corresponding recesses of the wall of the annular channel.
- the dynamic region along whose axial and radial sealing surface the lever or the piston slides during operation of the rotary piston engine, must assume the seal with respect to the hydraulic fluid.
- the contact pressure or surface pressure between the sealing surfaces and the moving parts must therefore be at least as great as the pressure of the hydraulic fluid on the pressurized side of the piston (system pressure).
- the contact pressure should not be too high to avoid unnecessary friction losses.
- the thus required variation of the contact pressure is effected according to the invention characterized in that the formed in the static region of the sealing member channel is acted upon by the pressurized hydraulic fluid.
- This loading is thus carried out from the static side (via corresponding feeds for the hydraulic fluid), wherein the pressure in the channel is transferred from the static region to the dynamic region of the sealing element and thus a counter-pressure acting on the sealing surfaces is generated.
- the contact pressure of the sealing element increases in accordance with the pressure of the hydraulic fluid in the annular channel, against which the seal is to take place.
- the sealing effect of the sealing element according to the invention is thus more or less self-regulating when the channel is exposed to the hydraulic fluid.
- the self-regulating effect in the application of the channel with the hydraulic fluid can be adjusted so that both in the static and in the dynamic state a sufficient contact force is present, for.
- a surface pressure which is about 10% above the system pressure.
- the dynamic range and the static range of the sealing element according to the invention may consist of the same material.
- the sealing element may be formed in one piece in this case in particular. Suitable materials are in particular fluoropolymers such as PTFE or TFE copolymers in question.
- the sealing element comprises a first sealing part, which forms the dynamic range, and a second sealing part, which forms the static area.
- the second sealing part is connected along the sealing surfaces opposite sides of the first sealing member with this.
- the first and second sealing parts are each rotationally symmetrical with respect to the axis of rotation, i.
- the sealing element has in each case substantially the same cross-sectional shape along various planes containing the axis of rotation. According to the annular channel of the rotary piston engine, the sealing element may extend along the entire circumference of a circle, i. be annular, or only along a partial arc.
- the immediate dynamic sealing function is adopted in the two-piece embodiment of the sealing element according to the invention by the first sealing part.
- This is preferably formed from a non-elastomeric fluoropolymer.
- Fluoropolymers in particular PTFE or TFE copolymers (see below), are distinguished by high abrasion resistance, high chemical and thermal resistance and low frictional resistance. The latter property is essential because the axial sealing surface of the first sealing part extends over the entire extent of the lever in the circumferential direction and is therefore relatively large. Excessively high friction would lead to considerable losses in power transmission as well as heavy lever wear.
- the non-elastomeric fluoropolymers also have, in particular, a low distribution of frictional force, ie the static friction and the sliding friction are approximately the same or differ only insignificantly. As a result, an undesirable stick-slip effect, ie a jerky initiation of movement of the piston, can be largely avoided.
- the dynamic range or the first sealing part of the sealing element according to the invention also has a radial sealing surface through which this seal is supplemented.
- the radial sealing surface forms a part of the peripheral surface of the annular channel and is in each case partially against the piston, which moves along the annular channel.
- the radial sealing surface thus contributes (in addition to the seal of the piston) for sealing the pressurized side of the piston against the non-pressurized side.
- the axial sealing surface and the radial sealing surface abut each other along an edge, which is formed in a circle or in the form of a partial circular arc. This edge runs along the outer circumference of the lever.
- the second sealing part is preferably formed of an elastomeric material in a two-piece sealing element according to the invention. This achieves a certain bias, i. the first sealing part is pressed against the lever due to the elastic properties of the second sealing part. This contact force is sufficient at least for the static state of the rotary piston engine, i. for the case when the piston is not in motion and the fluid imparting the movement is not or only slightly pressurized.
- the axial sealing surface of the dynamic region or of the first sealing part can lie in a plane perpendicular to the axis of rotation.
- the entire axial sealing surface bears against the surface of the lever, which is also perpendicular to the axis of rotation.
- the axial sealing surface is inclined with respect to a plane perpendicular to the axis of rotation.
- the axial sealing surface is then only in the region of the edge between the axial and the radial sealing surface on the surface of the lever.
- the dynamic range is slightly deformed by the action of the channel with the hydraulic fluid and the inclined axial sealing surface pressed in the direction of the lever, ie, the effective sealing surface is continuously increased with increasing hydraulic pressure until the entire axial sealing surface bears against the lever.
- the inclination of the axial sealing surface is desirably not more than 8 °, with an inclination in the range of 1 ° to 3 ° being particularly preferred.
- the choice of the appropriate angle of inclination is i.a. also depends on the material chosen (eg on the nature of the non-elastomeric fluoropolymer of the first seal part).
- the axial sealing surface has one or more grooves.
- the effective sealing surface can be reduced or distributed over a larger area in the radial direction, which is particularly advantageous in order to adapt the extent of the axial sealing surface to the geometry of the channel formed in the static region.
- the grooves may be arranged concentrically around the axis of rotation or have a twist to return hydraulic fluid which has penetrated between the sealing surface and the lever, by the rotation of the lever in the direction of the annular channel.
- the grooves may also serve as a reservoir for a lubricant (e.g., grease) applied to the sealing surface.
- the non-elastomeric fluoropolymer of the first seal member preferably comprises, as already mentioned above, a homopolymeric PTFE or a copolymer of tetrafluoroethylene with at least one comonomer.
- the at least one comonomer is preferably selected from hexafluoropropylene, perfluoroalkyl vinyl ethers, perfluoro (2,2-dimethyl-l, 3-dioxole) and chlorotrifluoroethylene.
- Hompolymeres PTFE is characterized by an extremely high thermal and chemical resistance and by a very low coefficient of friction, whereby it can be used advantageously in the context of the present invention.
- PTFE although it is a thermoplastic polymer, due to its extremely high melt viscosity is not from the melt, so z. B. by injection molding, processable.
- a first sealing part made of PTFE can be produced in particular by machining (eg turning).
- Copolymers of tetrafluoroethylene and the above-mentioned fluorine compounds are referred to as a modified PTFE at a relatively low comonomer content, which is also not melt-processible. However, with a slight increase in the comonomer content, it is possible to obtain melt-processible fluoropolymers while retaining the advantageous properties of the PTFE almost completely.
- Such copolymers are z.
- a first sealing part made of such a material may e.g. produced by injection molding, which is more efficient in terms of production technology than a machining operation.
- a melt processable TFE copolymer having a melting point in the range 315-324 ° C is offered by the ElringKlinger Kunststofftechnik GmbH under the trademark Moldflon ®.
- the fluoropolymer may additionally contain one or more fillers.
- fillers are known in the art and include, for. As graphite, carbon fibers, molybdenum sulfide and high-performance thermoplastics such.
- polyether ketones As polyether ketones, polyphenylene sulfides, polyetherimides, etc.
- type and amount of fillers depends in particular on the type of fluoropolymer used.
- the elastomeric material of the second sealing part preferably comprises a thermoplastic elastomer, in particular an elastomeric polyurethane.
- Elastomeric polyurethane has sufficient elasticity to provide the necessary preload of the sealing element in the static state, but at the same time it is hard enough to be machined.
- the thermoplastic property allows production of the second sealing part, for example by means of injection molding.
- elastomeric polyurethane has high chemical resistance, compressive strength and wear resistance.
- thermoplastic elastomers in principle other, typically non-thermoplastic elastomers with a sufficient chemical resistance to the hydraulic fluid can be used for the second sealing part in the context of the invention, such as.
- fluororubber nitrile rubber, silicone rubber or EPDM.
- the first and second sealing parts of the sealing element according to the invention may be connected together in different ways, e.g. by a form or adhesion.
- the two sealing parts are materially connected to one another.
- a cohesive connection ensures a lasting stability of the sealing element and for the best possible transmission of force between the first and the second sealing part, in particular also when the channel of the second sealing part with the hydraulic fluid.
- the two sealing parts can be glued together, for example, by means of a suitable adhesive or adhesion promoter.
- a suitable adhesive or adhesion promoter In the case of the fluoropolymers of the first sealing part, however, this often requires a preceding surface treatment, for example by means of plasma etching or by means of sodium ammonia etching. It is particularly favorable if the second sealing part is melted onto the first sealing part. This requires corresponding thermoplastic properties of the material of the second sealing part, as they are for. B. are given in elastomeric polyurethane. An additional adhesive can be dispensed with in this case.
- first and the second sealing part are produced by coextrusion of the non-elastomeric fluoropolymer and the elastomeric material.
- both materials are thermoplastically processable, which is the case in particular when using a thermoplastic TFE copolymer for the first sealing part.
- the production of such a sealing element is particularly efficient since neither of the two sealing parts has to be produced by machining (eg turning).
- the channel formed in the static portion and in the second sealing portion, respectively makes it possible to increase the pressing force of the axial sealing surface to the surface of the lever by introducing the pressurized hydraulic fluid into the channel.
- this also applies, albeit to a lesser extent, to the contact force of the radial sealing surface (or a portion of the radial sealing surface) on the piston.
- the channel runs along its circumferential direction, in accordance with the rotational symmetry of the sealing element, and the delivery of the fluid is conveniently effected via one or more fluid feeds in the wall of the annular channel of the rotary piston machine ending in the recess receiving the sealing element.
- the channel is closed towards the first sealing part.
- the fluid introduced into the channel does not come into contact with the first sealing part, but the force transmission takes place over a region of the elastomeric material of the second sealing part.
- This design allows the channel to open outwardly along the entire circumference of the sealing member without the second sealing member losing its structural integrity.
- the second sealing part can be produced by injection molding as well as by machining (eg turning) without any special effort.
- the channel formed in the second sealing part can be undercut, in such a way that widens the bottom portion of the channel in the direction of the radial sealing surface of the first sealing part.
- the thickness of the elastic material between the channel and the first sealing member is reduced in the radial direction and the pressing force of the radial sealing surface due to the pressurization of the channel is enhanced.
- the channel formed in the second sealing part is open towards the first sealing part.
- the hydraulic fluid introduced into the channel comes into direct contact with the first sealing part, in particular with a region of the first sealing part having the axial sealing surface, so that the force transmission is particularly effective.
- the channel may not be open to the outside along the entire circumference of the sealing member, otherwise the second sealing member would lose its structural integrity.
- one or more apertures are provided in the second sealing member, which preferably extend axially through the second sealing member and terminate in the channel.
- the channel is delimited by a cross-sectionally trough-shaped metal profile which is likewise open toward the first sealing part.
- the metal profile is gives a steel profile.
- the sealing element according to the invention is particularly suitable for use in a rotary piston machine, as described for example in DE 10 2007 001 021 AI.
- the present invention thus also relates to a rotary piston machine having at least one annular channel curved along an at least partially circular arc, in which a piston is movably supported, and an annular gap introduced into the wall of the annular channel, in which a lever rotatable about a rotation axis coaxial with the annular channel is guided, wherein the rotary piston machine comprises at least two sealing elements according to the invention, which are received in corresponding recesses of the wall of the annular channel, so that the axial sealing surfaces of the two sealing elements are respectively oriented towards opposite surfaces of the lever and the radial sealing surfaces of the sealing elements to the interior of the annular channel oriented and abuts a portion of the radial sealing surfaces on the piston.
- the sealing elements are held positively and / or non-positively in the recesses of the wall of the annular channel. It is particularly advantageous if the sealing elements are glued into the recesses, since in this way a particularly stable connection can be created.
- the bond creates, in particular, a rotationally secure fixing of the sealing elements. opposite the wall.
- a polyurethane adhesive is preferably used, in particular if the second sealing part is formed from an elastomeric polyurethane.
- Figure 1 a first embodiment of a sealing element according to the invention
- FIG. 2 shows a detail of a rotary piston machine according to the invention with two sealing elements according to FIG. 1;
- Figure 3 a second embodiment of a sealing element according to the invention.
- Figure 4 a third embodiment of a sealing element according to the invention.
- FIG. 1 shows a first embodiment of a sealing element according to the invention, which is designated as a whole with 10.
- the sealing element 10 is rotationally symmetrical in the form of a ring or a partial circular arc, wherein in the figure 1, a cross section along a plane containing the axis of rotation is shown.
- FIG. 2 shows a section of a rotary piston machine 12 according to the invention, which has two sealing elements 10 according to the invention as shown in FIG 1 includes. Structure and function of such a rotary piston engine are described in detail in DE 10 2007 001 021 AI.
- the sealing element 10 comprises a first sealing part 14 and a second sealing part 16, both of which are rotationally symmetrical with respect to the axis of rotation.
- the first sealing part 14 forms a dynamic range and the second sealing part 16 forms a static area of the two-piece sealing element 10.
- the first sealing member 14 is formed of a non-elastomeric fluoropolymer (eg, PTFE or a melt-processable TFE copolymer), and the second sealing member 16 is formed of an elastomeric material (e.g., an elastomeric polyurethane).
- the two sealing parts 14 and 16 are integrally connected to each other, for. B. by melting the second seal member 16 on the first seal member 14.
- the seal member 10 may also be prepared by coextrusion of the two seal parts 14 and 16.
- the first sealing member 14 includes a radial portion 18 having a radial sealing surface 20 and an axial portion 22 having an axial sealing surface 24.
- the radial sealing surface 20 and the axial sealing surface 24 abut each other along an edge 26, the edge 26 being annular ,
- the second sealing part 16 is radially offset in relation to the radial region 18 and axially relative to the axial region 22.
- the axial sealing surfaces 24 of the two sealing elements 10 are respectively oriented towards opposite surfaces 28 of a lever 30.
- the lever 30 is a substantially circular traction sheave which is fixedly connected on the one hand to a piston 32 and on the other hand to a rotary body (eg a shaft) not shown in FIG.
- the piston 32 is movably mounted in an annular channel 34, and the lever 30 is rotatably guided in an annular gap 36 which is introduced into the wall 38 of the annular channel 32, about the axis of rotation.
- the axial sealing surface 24 of the first sealing member 14 is inclined relative to a plane perpendicular to the axis of rotation, which corresponds to the surface 28 of the lever 30 by an angle of about 2 °.
- the axial sealing surface 24 In the unpressurized state of the sealing member 10 is therefore the axial sealing surface 24 only in the region of the edge 26 on the surface 28, which is sufficient for a seal against the hydraulic fluid in the annular channel 34 in the static, ie unpressurized state.
- the axial sealing surface 24 has a plurality of grooves 40, whereby the effective sealing surface can be reduced or distributed over a larger area in the radial direction.
- the radial sealing surface 20 of the first sealing part 14 faces the interior of the annular channel 34 and abuts the piston 32 in sections.
- the radial sealing surface 20 thus contributes to the sealing of the pressurized side of the piston 32 to the non-pressurized side.
- a channel 42 is formed, which extends along the entire circumference of the sealing element 10.
- the channel 42 is closed to the first seal member 14 and open to the outside throughout.
- the channel 42 is acted upon by one or more fluid feeds 43 in the wall 38 with the pressurized hydraulic fluid.
- a force is transmitted to the axial region 22 of the first sealing part 14 (and to a lesser extent to the radial region 18), so that the inclination of the axial sealing surface 24 is increasingly lifted and finally the entire axial sealing surface 24 on the surface 28 of the lever 30th is applied.
- the sealing effect of the sealing element 10 according to the invention thus increases in accordance with the pressure of the hydraulic fluid to be sealed in the annular channel 34 of the rotary piston engine 12.
- the sealing element 10 of the invention allows by its structure and the choice of materials an optimal sealing effect both in the static state (due to the bias of the elastic material of the second sealing part 16) as well as in the dynamic state (by the pressurization of the channel 42).
- the sealing elements 10 are received in corresponding recesses 44 of the wall 38 of the annular channel 34 and held there positively and / or non-positively.
- the sealing elements 10 are glued into the recesses 44, z. B. by means of a polyurethane adhesive.
- FIG 3 shows a second embodiment of a sealing element according to the invention, which is designated as a whole with 50.
- the seal member 50 is constructed in accordance with the seal member 10 according to the first embodiment except for the differences described below, wherein the same or corresponding elements are respectively provided with the same reference numeral.
- the radial sealing surface 20 of the sealing element 50 has a smaller extent in the axial direction, i. the radial sealing surface 20 is smaller.
- the channel 42 is undercut in the second sealing part 16, i. the bottom portion 52 of the channel 42 has an extension 54 in the radial outward direction.
- FIG. 4 shows a third exemplary embodiment of a sealing element according to the invention, which as a whole is designated 60.
- the sealing element 60 also corresponds to the sealing element 10 according to the first exemplary embodiment except for the differences in construction described below.
- the channel 42 formed in the second sealing part 16 is open toward the first sealing part 14 and is delimited by a steel profile 62, which is trough-shaped in cross-section and likewise open toward the first sealing part 14.
- the pressure of the introduced into the channel 42 hydraulic fluid is transmitted directly to the axial portion 22 of the first seal member 14.
- the steel profile 62 prevents deformation of the elastic material of the second sealing part 16 by the pressure of the hydraulic fluid.
- the steel profile 62 protects the channel 42 from being adversely affected when the second sealing part 16 melts onto the first sealing part 14.
- the channel 42 is closed outwards along the circumference of the second sealing part 16.
- the introduction of the fluid into the channel 42 via one or more holes 64 which extend in the axial direction through the second sealing member 16 and the steel profile 62.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sealing Devices (AREA)
- General Details Of Gearings (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011003934A DE102011003934A1 (de) | 2011-02-10 | 2011-02-10 | Dichtungselement für Kreiskolbenmaschine |
PCT/EP2012/051076 WO2012107279A2 (de) | 2011-02-10 | 2012-01-25 | Dichtungselement für kreiskolbenmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2673471A2 true EP2673471A2 (de) | 2013-12-18 |
EP2673471B1 EP2673471B1 (de) | 2020-09-02 |
Family
ID=45529107
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12700992.6A Active EP2673471B1 (de) | 2011-02-10 | 2012-01-25 | Dichtungselement für kreiskolbenmaschine |
Country Status (5)
Country | Link |
---|---|
US (1) | US9074475B2 (de) |
EP (1) | EP2673471B1 (de) |
CN (1) | CN103502573B (de) |
DE (1) | DE102011003934A1 (de) |
WO (1) | WO2012107279A2 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT201800004699A1 (it) * | 2018-04-19 | 2019-10-19 | Guarnizione d'emergenza | |
DE102019112796A1 (de) * | 2019-05-15 | 2020-11-19 | HR Flurfördergeräte GmbH | Kreiskolbenmaschine |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1328410A (en) * | 1915-09-07 | 1920-01-20 | Howard L Weed | Rotary engine |
US1476784A (en) * | 1920-01-02 | 1923-12-11 | Weed Differential Rotary Motor | Rotary internal-combustion engine |
US1944875A (en) * | 1926-02-26 | 1934-01-30 | Bullington Motors | Sealing means for annular cylinder engines |
GB591781A (en) * | 1943-08-05 | 1947-08-28 | Richard Lee Snyder | Improvements in or relating to rotary internal combustion engines |
US2997318A (en) * | 1957-08-01 | 1961-08-22 | Parker Hannifin Corp | Sealing rings for rods and shafts |
US3825272A (en) * | 1971-05-19 | 1974-07-23 | Townsend Engineering Co | Face seal for food processing equipment |
US3829106A (en) * | 1972-12-04 | 1974-08-13 | Crane Packing Co | High pressure lip seal |
JPS564061U (de) * | 1979-06-22 | 1981-01-14 | ||
US4560174A (en) * | 1983-12-02 | 1985-12-24 | Berco S.P.A. | Multi lip seal |
JPH01169669U (de) * | 1988-05-23 | 1989-11-30 | ||
AU6502890A (en) * | 1989-10-04 | 1991-04-28 | Archimedes Associates, Inc. | Rotary piston machine seal |
DE4333047C1 (de) * | 1993-09-29 | 1994-10-27 | Freudenberg Carl Fa | Dichtungsanordnung |
US6290235B1 (en) * | 1997-07-02 | 2001-09-18 | Parker-Hannifin Corporation | Sealing system for a reciprocating shaft |
US6737165B1 (en) | 1998-08-06 | 2004-05-18 | Omlidon Technologies Llc | Melt-processible poly(tetrafluoroethylene) |
US20060145426A1 (en) * | 2004-12-30 | 2006-07-06 | Schroeder Gary W | Rotary seal |
US8029714B2 (en) * | 2005-09-12 | 2011-10-04 | Federal-Mogul World Wide, Inc. | Radial seal and method of making |
DE102007001021B4 (de) | 2007-01-02 | 2010-11-18 | Heinz Raubacher | Kreiskolbenmaschine |
JP5507273B2 (ja) * | 2010-01-26 | 2014-05-28 | Nok株式会社 | 密封装置およびこれを用いるポンプ装置 |
-
2011
- 2011-02-10 DE DE102011003934A patent/DE102011003934A1/de not_active Withdrawn
-
2012
- 2012-01-25 CN CN201280008462.7A patent/CN103502573B/zh not_active Expired - Fee Related
- 2012-01-25 WO PCT/EP2012/051076 patent/WO2012107279A2/de active Application Filing
- 2012-01-25 EP EP12700992.6A patent/EP2673471B1/de active Active
-
2013
- 2013-08-07 US US13/961,333 patent/US9074475B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2012107279A2 * |
Also Published As
Publication number | Publication date |
---|---|
DE102011003934A1 (de) | 2012-08-16 |
EP2673471B1 (de) | 2020-09-02 |
WO2012107279A3 (de) | 2013-07-25 |
US20130319222A1 (en) | 2013-12-05 |
US9074475B2 (en) | 2015-07-07 |
WO2012107279A2 (de) | 2012-08-16 |
CN103502573B (zh) | 2016-08-10 |
CN103502573A (zh) | 2014-01-08 |
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