WO2021200938A1 - 摺動部品 - Google Patents
摺動部品 Download PDFInfo
- Publication number
- WO2021200938A1 WO2021200938A1 PCT/JP2021/013524 JP2021013524W WO2021200938A1 WO 2021200938 A1 WO2021200938 A1 WO 2021200938A1 JP 2021013524 W JP2021013524 W JP 2021013524W WO 2021200938 A1 WO2021200938 A1 WO 2021200938A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- groove
- dynamic pressure
- fluid
- pressure generating
- sliding
- Prior art date
Links
- 238000011109 contamination Methods 0.000 abstract description 21
- 230000007246 mechanism Effects 0.000 abstract description 10
- 239000012530 fluid Substances 0.000 description 172
- 238000007789 sealing Methods 0.000 description 51
- 230000003068 static effect Effects 0.000 description 30
- 230000004048 modification Effects 0.000 description 10
- 238000012986 modification Methods 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 229910052799 carbon Inorganic materials 0.000 description 7
- 230000006698 induction Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3404—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal
- F16J15/3408—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal at least one ring having an uneven slipping surface
- F16J15/3412—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal at least one ring having an uneven slipping surface with cavities
-
- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/74—Sealings of sliding-contact bearings
-
- 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
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3404—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal
- F16J15/3408—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal at least one ring having an uneven slipping surface
- F16J15/3424—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal at least one ring having an uneven slipping surface with microcavities
Definitions
- the present invention relates to sliding parts that rotate relative to each other, for example, sliding parts used in a shaft sealing device for shaft-sealing the rotating shaft of a rotating machine in an automobile, a general industrial machine, or other sealing fields, or an automobile or a general industrial machine. Or other sliding parts used for bearings of machines in the bearing field.
- a mechanical seal is provided with a pair of annular sliding parts that rotate relative to each other and slide between sliding surfaces.
- it has been desired to reduce the energy lost due to sliding for environmental measures and the like.
- the mechanical seal shown in Patent Document 1 is provided with a dynamic pressure generating mechanism on the sliding surface of one of the sliding parts.
- This dynamic pressure generation mechanism has a conduction groove that communicates with the outer space in which the sealed fluid exists and extends in the radial direction, and a dynamic pressure generation groove that extends from the conduction groove in the circumferential direction and has a closed end. Is formed deeper than the dynamic pressure generating groove.
- a sliding component such as Patent Document 1
- the conductive groove is filled with the fluid, the fluid is surely supplied from the conductive groove to the dynamic pressure generating groove during the relative rotation of the sliding component.
- the conduction groove is deeper than the dynamic pressure generation groove and is filled with a large amount of fluid, and contamination may accumulate in the conduction groove, causing contamination to get caught between the sliding surfaces and cause abstract wear. there were.
- the present invention has been made by paying attention to such a problem, and an object of the present invention is to provide a sliding component capable of suppressing the accumulation of contamination in a conduction groove.
- the sliding parts of the present invention are An annular sliding component that is placed at a location where the rotating machine rotates relative to another and slides relative to other sliding components.
- the sliding surface of the sliding component is provided with a conduction groove communicating with the external space and a dynamic pressure generating groove communicating with the conduction groove and extending in the circumferential direction and having a closed end portion.
- the bottom of the conduction groove has at least a part of an inclined surface inclined in the radial direction.
- the fluid on the upper surface side of the conduction groove mainly receives a shearing force, and a vortex-like flow centered on the radial direction is generated in the conduction groove, and this vortex-like flow is an inclined surface. Due to the influence of the above, the fluid is inclined along the inclined surface, and a component flowing in the radial direction is generated in the fluid in the conduction groove. In this way, it is possible to induce the flow of fluid flowing in the radial direction in the conduction groove and discharge the contamination flowing into the conduction groove to the outside of the conduction groove to prevent the contamination from accumulating in the conduction groove.
- the inclined surface may be formed at the bottom of the conduction groove over the entire area in the radial direction. According to this, the fluid flows smoothly in the radial direction in the conduction groove.
- the radial end of the conduction groove on the external space side may be wider in the circumferential direction than the end on the radial opposite side of the external space.
- the peripheral surface on the radial outer space side of the sliding component and the side wall surface of the conduction groove are likely to be formed at an blunt angle in other words, in other words, due to the viscosity of the sliding component. Since it is easy to move along the peripheral surface on the radial outer space side and the side wall surface of the conduction groove, it is easy to take in the fluid in the external space into the conduction groove, and it is easy to discharge the fluid in the conduction groove to the external space.
- the dynamic pressure generating groove may communicate with each other at a portion shallower than the inclined surface as a whole. According to this, a large communication region between the dynamic pressure generation groove and the conduction groove can be secured, and a step is formed between the conduction groove and the dynamic pressure generation groove, so that the contamination existing in the conduction groove generates the dynamic pressure. It is difficult to enter the groove.
- the inclined surface may be continuous with the sliding surface. According to this, the fluid is easily discharged between the conduction groove and the sliding surface.
- the side wall portion of the conduction groove may have an arc shape when viewed from the axial direction. According to this, the fluid in the conduction groove flows smoothly in the radial direction along the side wall portion.
- the dynamic pressure generation groove may communicate with the external space. According to this, even if contamination flows into the dynamic pressure generation groove, the contamination is likely to be discharged to the external space.
- the dynamic pressure generation groove and the external space may be separated by a land portion. According to this, since it is possible to suppress the fluid in the dynamic pressure generation groove from leaking to the external space, it is possible to generate positive pressure and negative pressure as high dynamic pressure in the dynamic pressure generation groove.
- the external space according to the present invention may be an outer space existing on the outer diameter side of the sliding component or an inner space existing on the inner diameter side of the sliding component.
- FIG. 1 It is a vertical cross-sectional view which shows an example of the mechanical seal in Example 1 of this invention. It is the figure which looked at the sliding surface of the static sealing ring from the axial direction. It is a cross-sectional view of AA. It is a BB cross-sectional view. It is the schematic which shows the flow of the fluid in the conduction groove and the dynamic pressure generation groove at the time of relative rotation. It is the schematic which shows the flow of the fluid in the conduction groove at the time of relative rotation. It is explanatory drawing which shows the modification 1 of the static sealing ring of Example 1. FIG. It is explanatory drawing which shows the modification 2 of the static sealing ring of Example 1. FIG. It is explanatory drawing which shows the modification 3 of the static sealing ring of Example 1. FIG.
- the sliding parts according to the first embodiment will be described with reference to FIGS. 1 to 6.
- a mode in which the sliding component is a mechanical seal will be described as an example.
- a mode in which the sealed fluid F exists in the inner space S1 as the outer space on the inner diameter side of the mechanical seal and the atmosphere A exists in the outer space S2 as the outer space on the outer diameter side will be described as an example. ..
- dots may be added to the grooves and the like formed on the sliding surface in the drawings.
- the mechanical seal for general industrial machinery shown in FIG. 1 is an outside type that seals the sealed fluid F that tends to leak from the inner diameter side to the outer diameter side of the sliding surface.
- a mode in which the sealed fluid F is a high-pressure liquid and the atmosphere A is a gas having a lower pressure than the sealed fluid F is illustrated.
- the mechanical seal is fixed to the rotary seal ring 20 as another annular sliding component provided on the rotary shaft 1 so as to be rotatable together with the rotary shaft 1 via the sleeve 2, and to the housing 4 of the attached device.
- the sliding surface 11 of the static sealing ring 10 and the sliding surface 21 of the rotary sealing ring 20 slide closely with each other.
- the sliding surface 21 of the rotary sealing ring 20 is a flat surface, and the flat surface is not provided with a recess such as a groove.
- the static sealing ring 10 and the rotary sealing ring 20 are typically formed of SiC (hard material) or a combination of SiC (hard material) and carbon (soft material), but the sliding material is not limited to this. It can be applied as long as it is used as a sliding material for mechanical seals.
- the SiC includes a sintered body using boron, aluminum, carbon and the like as a sintering aid, and materials composed of two or more types of phases having different components and compositions, for example, SiC and SiC in which graphite particles are dispersed.
- carbon in which carbon and graphite are mixed.
- metal materials, resin materials, surface modification materials (coating materials), composite materials and the like can also be applied.
- the rotary sealing ring 20 slides relative to the static sealing ring 10 counterclockwise as shown by an arrow.
- a plurality of (8 in the first embodiment) dynamic pressure generating mechanisms 14 are evenly arranged in the circumferential direction on the inner diameter side.
- the portion of the sliding surface 11 other than the dynamic pressure generating mechanism 14 is a land 12 whose upper portion forms a flat end surface.
- a positive pressure generating mechanism such as dimples may be formed on the outer diameter side of the sliding surface 11.
- the dynamic pressure generation mechanism 14 includes a fluid guide groove 15 as a conduction groove communicating with the inner space S1, a first dynamic pressure generation groove 16 for generating positive pressure extending counterclockwise from the fluid guide groove 15 in the circumferential direction.
- a second dynamic pressure generating groove 17 for generating a negative pressure extending clockwise from the fluid guiding groove 15 is provided.
- the fluid guide groove 15 is directed toward the flat surface of the land 12 along the bottom surface 15a as a semicircular bottom portion having a convex shape on the outer diameter side when viewed from the axial direction and the arcuate side edge of the bottom surface 15a. It is composed of a vertically extending side wall portion 15b.
- the communication portion 15c (that is, the radial end portion on the outer space side) communicating with the inner space S1 in the fluid guide groove 15 is a portion on the top side of the outer diameter side of the fluid guide groove 15, that is, the outermost diameter portion. It is formed wider in the circumferential direction than 15d.
- the bottom surface 15a is an inclined surface 15a formed of a plane that gradually becomes shallower in the radial direction from the inner diameter side to the outer diameter side, and the outermost diameter portion 15d of the bottom surface 15a (that is, the end portion on the side opposite to the external space in the radial direction). ) Extends to the flat surface of the land 12. That is, a surface that is inclined over the entire radial direction of the bottom surface 15a is formed. Further, the fluid guide groove 15 has a maximum width W1 in the radial direction in the outermost diameter portion 15d.
- the innermost diameter portion of the fluid guide groove 15, that is, the communication portion 15c has the deepest depth D1.
- the depth D1 of this example is 100 ⁇ m.
- the deepest depth D1 of the fluid guide groove 15 can be freely changed.
- the fluid guide groove 15 has a symmetrical shape in the circumferential direction with reference to the virtual line LN (see FIG. 5) extending in the radial direction.
- the start end portion 16A of the relative rotation communicates with the fluid guide groove 15, and the end portion 16B of the relative rotation is closed.
- the first dynamic pressure generating groove 16 has a bottom surface 16a that is flat from the start end portion 16A to the end portion 16B and parallel to the flat surface of the land 12, and the land 12 from the end edge of the end portion 16B of the bottom surface 16a. It is composed of a wall portion 16b extending vertically toward the flat surface of the bottom surface 16a and a side wall portion 16c extending vertically from the side edge on the outer diameter side of the bottom surface 16a toward the flat surface of the land 12, and is composed of the inner diameter side of the bottom surface 16a. The side edge of the is connected to the inner space S1.
- the width W2 in the radial direction of the first dynamic pressure generating groove 16 is constant over the circumferential direction, and the width W2 is smaller than the width W1 (W1> W2).
- the first dynamic pressure generation groove 16 has a constant depth D2 from the start end portion 16A to the end end portion 16B.
- the depth D2 of this example is 10 ⁇ m.
- the depth D2 of the first dynamic pressure generating groove 16 can be freely changed, but the depth D2 is preferably 1/10 times or less of the depth D1.
- the second dynamic pressure generation groove 17 has a bottom surface 17a that is flat from the start end portion 17A to the end portion 17B and parallel to the flat surface of the land 12, and the land 12 from the edge of the end portion 17B of the bottom surface 17a. It is composed of a wall portion 17b extending vertically toward the flat surface of the bottom surface 17a and a side wall portion 17c extending vertically from the side edge on the outer diameter side of the bottom surface 17a toward the flat surface of the land 12, and is composed of the inner diameter side of the bottom surface 17a. The side edge of the is connected to the inner space S1.
- the second dynamic pressure generation groove 17 has a constant depth D3 from the start end portion 17A to the end end portion 17B.
- the depth D2 of the first dynamic pressure generating groove 16 and the depth D3 of the second dynamic pressure generating groove 17 may have different dimensions.
- the depth D3 of the second dynamic pressure generating groove 17 can be freely changed, but the depth D3 is preferably 1/10 times or less of the depth D1.
- the first dynamic pressure generating groove 16 and the second dynamic pressure generating groove 17 have a symmetrical shape in the circumferential direction with reference to the virtual line LN extending in the radial direction.
- first dynamic pressure generating groove 16 and the second dynamic pressure generating groove 17 communicate with each other in a region shallower than the bottom surface 15a of the fluid induction groove 15. That is, a step is formed by the side wall portion 15b interposed between the bottom surface 15a of the fluid guide groove 15, the first dynamic pressure generating groove 16, and the second dynamic pressure generating groove 17.
- the sealed fluid F in the first dynamic pressure generating groove 16 moves from the start end portion 16A toward the end end portion 16B, and is shown by the arrow L3 accordingly. As described above, the sealed fluid F in the fluid guide groove 15 flows into the first dynamic pressure generation groove 16.
- the pressure of the sealed fluid F in the first dynamic pressure generating groove 16 that has moved toward the end portion 16B is increased in the wall portion 16b and its vicinity. That is, a positive pressure is generated in and near the wall portion 16b.
- the sealed fluid F in the inner space S1 is one in the first dynamic pressure generating groove 16.
- the sealed fluid F in the first dynamic pressure generation groove 16 partially flows out into the inner space S1 as shown by the arrow L1''.
- the sealed fluid F in the second dynamic pressure generating groove 17 moves from the starting end portion 17A toward the ending portion 17B and flows out into the fluid guiding groove 15.
- Negative pressure is generated in the second dynamic pressure generation groove 17 in which the sealed fluid F moves toward the end portion 17B.
- the pressure at the start end portion 17A is lower than the pressure at the end portion 17B.
- the sealed fluid F in the inner space S1 is one in the second dynamic pressure generating groove 17.
- the sealed fluid F in the second dynamic pressure generation groove 17 partially flows out into the inner space S1.
- the sealed fluid F in the fluid guide groove 15, particularly the sealed fluid F in the upper part of the fluid guide groove 15, is from the second dynamic pressure generation groove 17 side to the first dynamic pressure generation groove 16. Move in the circumferential direction toward the side.
- the sealed fluid F in the inner space S1 partially flows into the fluid guide groove 15, and is indicated by the arrow L5.
- the sealed fluid F in the fluid guide groove 15 partially flows out into the inner space S1.
- the positive pressure increases in the wall portion 16b of the first dynamic pressure generating groove 16 and its vicinity, as shown by the arrow L6.
- the sealed fluid F of the first dynamic pressure generating groove 16 flows out from the terminal portion 16B between the sliding surfaces 11 and 21.
- the sealed fluid F of the first dynamic pressure generating groove 16 flows out between the sliding surfaces 11 and 21 in the outer diameter direction from the corner portion composed of the wall portion 16b and the side wall portion 16c.
- the negative pressure generated at the starting end portion 17A becomes large, and the sealed fluid F between the sliding surfaces 11 and 21 existing in the vicinity of the starting end portion 17A is transferred to the second dynamic pressure generating groove. Since it can be pulled into the 17 and returned to the fluid guide groove 15, it is possible to prevent the sealed fluid F between the sliding surfaces 11 and 21 from leaking into the outer space S2.
- the pressure of the sealed fluid F in the fluid guide groove 15 is increased by the shearing force to generate a positive pressure, which causes an arrow.
- the sealed fluid F in the fluid guide groove 15 slightly flows out between the sliding surfaces 11 and 21.
- the bottom surface 15a of the fluid guide groove 15 is inclined in the radial direction so as to gradually become shallower toward the outer diameter side, the volume of fluid that can flow depending on the radial position of the fluid guide groove 15 is increased. Different, thereby causing a difference in velocity depending on the radial position, and the vortex flow F1 has a component flowing in the radial direction. Further, since the bottom surface 15a is inclined, the fluid flows smoothly in the radial direction.
- the sealed fluid in the fluid guiding groove 15 Since the pressure of F is higher on the outermost diameter portion 15d side than on the communication portion 15c side, the sealed fluid F in the inner space S1 shown by the arrow L4 does not easily flow to the outermost diameter portion 15d of the fluid guide groove 15. For example, most of the sealed fluid F of the arrow L4 flows to the radial center portion of the fluid guide groove 15 and then flows back toward the inner space S1 (that is, the flow of the arrow L5).
- the sealed fluid F in the fluid guide groove 15 is affected by the inclined bottom surface 15a, and the spiral flow is inclined in the radial direction. F1 is generated. Therefore, since a component that flows in the radial direction is generated in the sealed fluid F in the fluid guide groove 15, the contamination that has flowed into the fluid guide groove 15 can be discharged to the outside of the fluid guide groove 15, and the contamination accumulates in the fluid guide groove 15. Can be suppressed. Further, a part of the sealed fluid F in the fluid guide groove 15 is increased in pressure at the portion of the side wall portion 15b on the side of the first dynamic pressure generating groove 16 and flows out between the sliding surfaces 11 and 21, so that the fluid is guided. The radial flow of the sealed fluid F in the groove 15 is promoted (see arrow L7 in FIGS. 5 and 6).
- the contamination flowing into the fluid guide groove 15 is discharged to the inner space S1 mainly together with the flow of the sealed fluid F flowing out from the fluid guide groove 15 to the inner space S1 (FIGS. 5 and 6). See arrow L5). Further, a part of the contamination is discharged between the sliding surfaces 11 and 21 together with the flow of the sealed fluid F flowing out from the fluid guide groove 15 between the sliding surfaces 11 and 21 (arrows L7 in FIGS. 5 and 6). reference). The amount of contamination discharged between the sliding surfaces 11 and 21 is smaller than the amount of contamination discharged into the inner space S1.
- the vortex flow F1 generated in the fluid guide groove 15 can wind up the contamination accumulated on the bottom surface 15a of the fluid guide groove 15 and move it in the radial direction together with the sealed fluid F, so that the contamination can be moved to the outside of the fluid guide groove 15. Easy to discharge.
- the bottom surface 15a of the fluid guide groove 15 is a flat surface inclined and extending from the communication portion 15c to the outermost diameter portion 15d of the bottom surface 15a. That is, the sealed fluid F of the fluid guide groove 15 flows smoothly in the radial direction.
- the flat surface may be formed as long as the sealed fluid F flows in the radial direction, and may have a step portion that does not obstruct the radial flow or an uneven surface that is unavoidable in manufacturing.
- the communicating portion 15c communicating with the inner space S1 in the fluid guiding groove 15 is formed wider in the circumferential direction than the portion on the top side on the outer diameter side of the fluid guiding groove 15, it is inside the static sealing ring 10.
- the peripheral surface and the side wall portion 15b of the fluid guide groove 15 are formed at an angle (blunt angle) along the circumferential direction, and the fluid is viscous to the inner peripheral surface of the static sealing ring 10 and the side wall portion 15b of the fluid guide groove 15. Since it is easy to move along the above, the sealed fluid F in the inner space S1 is easily taken into the fluid guide groove 15, and the sealed fluid F in the fluid guide groove 15 is easily discharged into the inner space S1.
- first dynamic pressure generating groove 16 and the second dynamic pressure generating groove 17 communicate with each other in a region shallower than the bottom surface 15a of the fluid induction groove 15. According to this, a large communication region between the first dynamic pressure generating groove 16 and the second dynamic pressure generating groove 17 and the fluid guiding groove 15 can be secured, and the bottom surface 15a of the fluid guiding groove 15 and the first dynamic pressure generating groove 16 can be secured. Since a step is formed by the side wall portion 15b between the and the second dynamic pressure generating groove 17, the contamination existing in the fluid induction groove 15 is formed in the first dynamic pressure generating groove 16 and the second dynamic pressure generating groove 17. Difficult to enter. Further, since the height of the side wall portion 15b can be secured, the spiral flow F1 can be easily formed in the radial direction.
- the fluid guide groove 15 since the outermost diameter portion 15d of the bottom surface 15a of the fluid guide groove 15 extends to the flat surface of the land 12 and is continuous, the fluid is discharged between the fluid guide groove 15 and the sliding surfaces 11 and 21. This can be done and the radial flow of the sealed fluid F in the fluid guide groove 15 can be promoted.
- the side wall portion 15b of the fluid guide groove 15 has an arc shape when viewed from the axial direction. According to this, since the corner portion is not formed in the side wall portion 15b, the sealed fluid F in the fluid guide groove 15 does not stay and flows smoothly in the radial direction along the side wall portion 15b.
- the sealed fluid F in the fluid guide groove 15 is formed on the side wall portion 15b. It flows in a well-balanced manner along.
- first dynamic pressure generating groove 16 and the second dynamic pressure generating groove 17 communicate with the inner space S1, even if the contamination flows into the first dynamic pressure generating groove 16 and the second dynamic pressure generating groove 17. It can be discharged to the inner space S1 together with the arrow L1'' and the arrow L2'', and it is possible to suppress the accumulation of contamination in the first dynamic pressure generation groove 16 and the second dynamic pressure generation groove 17.
- the present invention is not limited to this, and for example, as shown in FIG. 7, the fluid guide groove 151 Is substantially rectangular when viewed from the axial direction, specifically, the inner space S1 side is an arc, the outer space S2 side is a straight line, and both sides in the radial direction are surrounded by straight lines orthogonal to the straight line on the outer space S2 side. You may.
- the fluid guide groove 152 has a substantially trapezoidal shape in which the inner space S1 side is wide when viewed from the axial direction.
- the inner space S1 side is an arc
- the outer space S2 side is a straight line and both sides in the radial direction. May form a shape surrounded by a straight line connected to a straight line on the outer space S2 side at an blunt angle.
- the fluid guide groove 15 has a symmetrical shape in the circumferential direction with respect to the virtual line LN extending in the radial direction.
- the fluid guide is formed.
- the groove 153 may have an elliptical shape that is asymmetrical in the circumferential direction with respect to the virtual line LN extending in the radial direction.
- the fluid guide groove 153 may have a rectangular shape or other polygonal shape that is asymmetrical in the circumferential direction with respect to the virtual line LN.
- the ends of the first dynamic pressure generating groove 16 and the second dynamic pressure generating groove 17 on the inner space S1 side are provided at positions separated from the circumferential end of the fluid guide groove 15 in the circumferential direction.
- the end portion 161a and the end portion 171a on the inner space S1 side of the first dynamic pressure generation groove 161 and the second dynamic pressure generation groove 171 are the circumferences of the fluid induction groove 15. It may be provided at the same position in the circumferential direction as the directional end.
- first dynamic pressure generating groove 16 and the second dynamic pressure generating groove 17 are extended on both sides of the fluid guide groove 15 in the circumferential direction, but as shown in FIG. Only the first dynamic pressure generating groove 162 (that is, the positive pressure generating groove) may extend in the circumferential direction with respect to the fluid guide groove 15.
- only the second dynamic pressure generating groove 172 (that is, the negative pressure generating groove) may extend in the circumferential direction with respect to the fluid guide groove 15.
- a fluid guide groove 15, a first dynamic pressure generating groove 163, and a second dynamic pressure generating groove 173 are formed on the sliding surface 110 of the static sealing ring 100.
- the first dynamic pressure generating groove 163, the second dynamic pressure generating groove 173, and the inner space S1 are partitioned by the land 120.
- the sealed fluid F of the first dynamic pressure generation groove 163 and the second dynamic pressure generation groove 173 from leaking to the inner space S1, so that the first dynamic pressure generation groove 163 and the second dynamic pressure generation are generated.
- the dynamic pressure can be reliably generated in the groove 173, and the inflow of contamination from the inner space S1 into the first dynamic pressure generation groove 163 and the second dynamic pressure generation groove 173 can be suppressed.
- the bottom portion of the conduction groove is inclined in the radial direction and extends to the sliding surface is illustrated, but the present invention is not limited to this, and the bottom portion of the conduction groove is not limited to this. It suffices to have an inclined surface inclined in the radial direction at least a part of the above.
- the bottom portion 154e of the fluid guide groove 154 has a flat surface 154f extending parallel to the flat surface of the land 12 from the end on the inner diameter side toward the outer diameter side, and the outside of the flat surface 154f. It may be composed of an inclined surface of 154 g that is inclined from the radial end portion toward the flat surface of the land 12.
- Example 1 and 2 and Modified Examples 1 to 6 the embodiment in which the bottom portion of the conduction groove is a flat inclined surface is illustrated, but for example, the bottom portion has an inclined surface having a curved surface shape in a cross-sectional view. You may.
- the bottom of the conduction groove is made shallower from the inner diameter side, that is, the side communicating with the external space to the outer space side, that is, the radial closing side of the conduction groove.
- the form in which the space is inclined is illustrated, but the present invention is not limited to this, and for example, the surface may be inclined so as to become shallower from the radial closed side toward the side communicating with the external space.
- the sealed fluid has been described as a high-pressure liquid, but the sealed fluid is not limited to this, and may be a gas or a low-pressure liquid, or may be in the form of a mist in which a liquid and a gas are mixed.
- the fluid on the leak side is the atmosphere A which is a low-pressure gas, but the present invention is not limited to this, and it may be a liquid or a high-pressure gas, or a mist-like mixture of a liquid and a gas. It may be.
- the sealed fluid side has been described as the high pressure side and the leak side as the low pressure side, the sealed fluid side may be the low pressure side and the leak side may be the high pressure side, and the sealed fluid side and the leak side are abbreviated.
- the pressure may be the same.
- the present invention is not limited to this. It may be an inside type that seals the sealed fluid F that leaks from the outer diameter side to the inner diameter side of the moving surface.
- the mechanical seal for general industrial machines has been described as an example as the sliding component, but other mechanical seals for automobiles, water pumps, etc. may be used. Further, the present invention is not limited to the mechanical seal, and may be a sliding component other than the mechanical seal such as a slide bearing.
- the conduction groove and the dynamic pressure generating groove are provided in the static sealing ring
- the conduction groove and the dynamic pressure generating groove may be provided in the rotary sealing ring.
- восем ⁇ dynamic pressure generating mechanisms having a conduction groove and a dynamic pressure generating groove are provided on the sliding surface, but the number thereof may be freely changed. Further, the shapes of the conduction groove and the dynamic pressure generation groove may be freely changed.
- the inclined surface of the conduction groove is exemplified in a form in which the inclined surface is inclined in the radial direction, but the present invention is not limited to this, and the inclined surface has a component inclining in the circumferential direction in addition to the component inclining in the radial direction. You may be doing it.
- Static sealing ring (sliding parts) 11 Sliding surface 12 Land (land part) 14 Dynamic pressure generation mechanism 15 Fluid induction groove (conduction groove) 15a Bottom (bottom) 15b Side wall 15c Communication part (radial end on the external space side) 15d Outermost diameter (radial end on the opposite side of the exterior space) 16 1st dynamic pressure generation groove (dynamic pressure generation groove) 17 Second dynamic pressure generation groove (dynamic pressure generation groove) 20 Rotating sealed ring (other sliding parts) 21 Sliding surface 100 Static sealing ring (sliding parts) 110 Sliding surface 120 Lands 151-153 Fluid guide groove (conduction groove) 161 to 163 1st dynamic pressure generation groove (dynamic pressure generation groove) 171 to 173 2nd dynamic pressure generation groove (dynamic pressure generation groove) A Atmosphere F Sealed fluid F1 Vortex flow S1 Interior space (external space) S2 exterior space (external space)
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanical Sealing (AREA)
Abstract
Description
回転機械の相対回転する箇所に配置され他の摺動部品と相対摺動する環状の摺動部品であって、
前記摺動部品の摺動面には、外部空間に連通する導通溝と、前記導通溝に連通し周方向に延び、閉塞された終端部を有する動圧発生溝と、が備えられており、
前記導通溝の底部は少なくとも一部に径方向に傾斜する傾斜面を有している。
これによれば、摺動部品の相対回転時には、主に導通溝上面側の流体がせん断力を受け、導通溝内で径方向を中心とする渦状の流れが生じ、この渦状の流れは傾斜面の影響を受けて傾斜面に沿うように傾斜し、導通溝内の流体に径方向に流れる成分が生じる。このようにして導通溝内において径方向に往来する流体の流れを誘起して導通溝内に流入したコンタミを導通溝外に排出させて、導通溝内にコンタミが溜まることを抑制できる。
これによれば、導通溝内において流体が径方向に円滑に流れる。
これによれば、摺動部品の径方向外部空間側の周面と、導通溝の側壁面と、が周方向に沿う角度に言い換えると鈍角に形成され易く、流体がその粘性により摺動部品の径方向外部空間側の周面と導通溝の側壁面に沿って移動し易いため、外部空間の流体を導通溝内に取り込みやすく、且つ導通溝内の流体を外部空間に排出しやすい。
これによれば、動圧発生溝と導通溝との連通領域を大きく確保できるとともに、導通溝と動圧発生溝との間に段差が形成されるので、導通溝に存在するコンタミが動圧発生溝内に進入し難い。
これによれば、導通溝と摺動面間との間で流体が排出されやすい。
これによれば、側壁部に沿って導通溝内の流体が径方向に円滑に流れる。
これによれば、動圧発生溝にコンタミが流入しても該コンタミを外部空間に排出しやすい。
これによれば、動圧発生溝内の流体が外部空間に漏れることを抑制できるので、動圧発生溝で高い動圧として正圧、負圧を発生させることができる。
11 摺動面
12 ランド(ランド部)
14 動圧発生機構
15 流体誘導溝(導通溝)
15a 底面(底部)
15b 側壁部
15c 連通部(外部空間側の径方向端部)
15d 最外径部(外部空間とは反対側の径方向端部)
16 第1動圧発生溝(動圧発生溝)
17 第2動圧発生溝(動圧発生溝)
20 回転密封環(他の摺動部品)
21 摺動面
100 静止密封環(摺動部品)
110 摺動面
120 ランド
151~153 流体誘導溝(導通溝)
161~163 第1動圧発生溝(動圧発生溝)
171~173 第2動圧発生溝(動圧発生溝)
A 大気
F 被密封流体
F1 渦状流
S1 内空間(外部空間)
S2 外空間(外部空間)
Claims (8)
- 回転機械の相対回転する箇所に配置され他の摺動部品と相対摺動する環状の摺動部品であって、
前記摺動部品の摺動面には、外部空間に連通する導通溝と、前記導通溝に連通し周方向に延び、閉塞された終端部を有する動圧発生溝と、が備えられており、
前記導通溝の底部は少なくとも一部に径方向に傾斜する傾斜面を有している摺動部品。 - 前記傾斜面は、前記導通溝の底部に径方向の全域に亘って形成されている請求項1に記載の摺動部品。
- 前記導通溝は、前記外部空間側の径方向端部が前記外部空間とは径方向反対側の端部よりも周方向に幅広となっている請求項1または2に記載の摺動部品。
- 前記動圧発生溝は全体が前記傾斜面よりも浅い部分で連通している請求項1ないし3のいずれかに記載の摺動部品。
- 前記傾斜面は、前記摺動面に連続している請求項1ないし4のいずれかに記載の摺動部品。
- 前記導通溝の側壁部は、軸方向から見て円弧状をなしている請求項1ないし5のいずれかに記載の摺動部品。
- 前記動圧発生溝は、前記外部空間に連通していている請求項1ないし6のいずれかに記載の摺動部品。
- 前記動圧発生溝と前記外部空間とは、ランド部により区画されている請求項1ないし6のいずれかに記載の摺動部品。
Priority Applications (5)
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US17/913,153 US20230175587A1 (en) | 2020-03-31 | 2021-03-30 | Sliding component |
KR1020227033234A KR20220146576A (ko) | 2020-03-31 | 2021-03-30 | 슬라이딩 부품 |
JP2022512533A JP7480278B2 (ja) | 2020-03-31 | 2021-03-30 | 摺動部品 |
CN202180021279.XA CN115298462A (zh) | 2020-03-31 | 2021-03-30 | 滑动部件 |
EP21779618.4A EP4130523A4 (en) | 2020-03-31 | 2021-03-30 | SLIDING COMPONENT |
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JP2020-062821 | 2020-03-31 | ||
JP2020062821 | 2020-03-31 |
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WO2021200938A1 true WO2021200938A1 (ja) | 2021-10-07 |
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US (1) | US20230175587A1 (ja) |
EP (1) | EP4130523A4 (ja) |
JP (1) | JP7480278B2 (ja) |
KR (1) | KR20220146576A (ja) |
CN (1) | CN115298462A (ja) |
WO (1) | WO2021200938A1 (ja) |
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EP3739242A4 (en) * | 2018-01-12 | 2021-10-13 | Eagle Industry Co., Ltd. | SLIDING ELEMENT |
JP7242658B2 (ja) * | 2018-05-17 | 2023-03-20 | イーグル工業株式会社 | シールリング |
CN112088267B (zh) * | 2018-05-17 | 2023-01-24 | 伊格尔工业股份有限公司 | 密封环 |
US20210164571A1 (en) * | 2018-05-17 | 2021-06-03 | Eagle Industry Co., Ltd. | Seal ring |
EP3922874A4 (en) * | 2019-02-04 | 2022-11-09 | Eagle Industry Co., Ltd. | SLIDING ELEMENT |
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2021
- 2021-03-30 EP EP21779618.4A patent/EP4130523A4/en active Pending
- 2021-03-30 JP JP2022512533A patent/JP7480278B2/ja active Active
- 2021-03-30 US US17/913,153 patent/US20230175587A1/en active Pending
- 2021-03-30 WO PCT/JP2021/013524 patent/WO2021200938A1/ja unknown
- 2021-03-30 KR KR1020227033234A patent/KR20220146576A/ko not_active Application Discontinuation
- 2021-03-30 CN CN202180021279.XA patent/CN115298462A/zh active Pending
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JPWO2021200938A1 (ja) | 2021-10-07 |
EP4130523A1 (en) | 2023-02-08 |
EP4130523A4 (en) | 2024-04-17 |
KR20220146576A (ko) | 2022-11-01 |
JP7480278B2 (ja) | 2024-05-09 |
US20230175587A1 (en) | 2023-06-08 |
CN115298462A (zh) | 2022-11-04 |
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