WO2021230081A1 - 摺動部品 - Google Patents
摺動部品 Download PDFInfo
- Publication number
- WO2021230081A1 WO2021230081A1 PCT/JP2021/016916 JP2021016916W WO2021230081A1 WO 2021230081 A1 WO2021230081 A1 WO 2021230081A1 JP 2021016916 W JP2021016916 W JP 2021016916W WO 2021230081 A1 WO2021230081 A1 WO 2021230081A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- relative rotation
- sliding
- peripheral surface
- sliding component
- communication portion
- Prior art date
Links
- 230000002093 peripheral effect Effects 0.000 claims abstract description 79
- 239000012530 fluid Substances 0.000 claims abstract description 70
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 27
- 239000000356 contaminant Substances 0.000 abstract description 5
- 230000008595 infiltration Effects 0.000 abstract 1
- 238000001764 infiltration Methods 0.000 abstract 1
- 238000007789 sealing Methods 0.000 description 71
- 230000003068 static effect Effects 0.000 description 48
- 238000011109 contamination Methods 0.000 description 35
- 230000005484 gravity Effects 0.000 description 12
- 239000000463 material Substances 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 238000000926 separation method Methods 0.000 description 3
- 239000003595 mist Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 241001272720 Medialuna californiensis Species 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
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000010008 shearing Methods 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
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- 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
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
-
- 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
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
- F16C17/045—Sliding-contact bearings for exclusively rotary movement for axial load only with grooves in the bearing surface to generate hydrodynamic pressure, e.g. spiral groove thrust 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
- 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
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/24—Brasses; Bushes; Linings with different areas of the sliding surface consisting of different materials
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- 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
-
- 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 field, or an automobile or a general industrial machine. Or other sliding parts used in the 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 in the circumferential direction from the conduction groove and has a closed end. Is formed deeper than the dynamic pressure generation groove. According to this, during the relative rotation of the sliding component, the sealed fluid is introduced from the outer space into the dynamic pressure generating groove through the conduction groove, and the sealed fluid moves toward the end of the dynamic pressure generating groove. Therefore, positive pressure is generated at the end of the dynamic pressure generation groove, the sliding surfaces are separated from each other, and the sealed fluid is interposed between the sliding surfaces to improve the lubricity.
- Patent Document 1 Although the lubricity is improved by providing the dynamic pressure generation groove, the contamination mixed in the sealed fluid during the relative rotation of the sliding component is also introduced from the conduction groove and then moves. It was introduced into the pressure generation groove and eventually entered between the sliding surfaces, and there was a risk that contamination would get caught between the sliding surfaces and cause abstract wear.
- 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 contamination from entering a dynamic pressure generation groove.
- the sliding parts of the present invention are An annular sliding part that is placed in a relative rotating part of a rotating machine and slides relative to other sliding parts.
- the sliding surface of the sliding component is provided with a dynamic pressure generating groove having a communication portion communicating with the external space and a closing portion relative to the rotation downstream of the communication portion.
- the sliding component is provided with a guiding means for guiding the fluid in the external space in a direction different from the peripheral surface extending downstream of the relative rotation of the communication portion upstream in the relative rotation direction of the communication portion.
- the fluid upstream in the relative rotation direction of the communicating portion flows to the downstream side of the relative rotation of the communicating portion without facing the communicating portion by the guiding means, and the flow flows to the communicating portion.
- a fluid with a slower speed is flowing in, and its flow rate is also small. Since the contamination having a large specific gravity flows along the flow having a relatively high flow velocity, the contamination flows downstream of the relative rotation of the communication portion, and it becomes difficult to reach the communication portion. In this way, it is possible to prevent contamination from entering the dynamic pressure generation groove.
- the guiding means may be the peripheral surface of the relative rotation upstream arranged on the external space side with respect to the peripheral surface of the relative rotation downstream. According to this, a step having a step in the radial direction is formed by the peripheral surface of the relative rotation upstream and the peripheral surface of the relative rotation downstream, and the fluid in the relative rotation upstream from the communication portion is in a direction different from the peripheral surface in the relative rotation downstream. It is possible to prevent the contamination from entering the dynamic pressure generation groove.
- the guiding means may extend to a position where it overlaps the communication portion in the radial direction. According to this, it is possible to surely suppress the contamination from entering the dynamic pressure generation groove.
- An inclined surface that inclines so as to become deeper from the communication portion toward the external space may be provided. According to this, when the fluid in the external space is introduced into the communication portion, the contamination having a large specific gravity comes into contact with the inclined surface and is separated from the fluid flow, so that the contamination enters the dynamic pressure generation groove. It can be suppressed.
- the guiding means may be a recess provided on the sliding surface and open to the external space. According to this, since the fluid in the external space can be guided in a direction different from the peripheral surface on the relative rotation downstream side of the communicating portion by the concave portion, the guiding means can be made a simple structure.
- the side wall of the recess may be curved in the axial direction. According to this, the fluid in the recess is smoothly guided along the side wall.
- the side wall of the recess may have an inclined surface that is inclined in the circumferential direction and extends in the radial direction in a direction away from the end portion on the external space side toward the communication portion side. According to this, the fluid in the recess is smoothly guided along the inclined surface.
- FIG. 2 is a cross-sectional view taken along the line AA of FIG. It is a schematic diagram which shows the flow of the sealed fluid at the time of relative rotation. It is a vertical sectional view which shows the flow of the sealed fluid at the time of relative rotation. It is a schematic diagram which shows the sliding component in Example 2 of this invention. It is a schematic diagram which shows the sliding component in Example 3 of this invention. It is a schematic diagram which shows the sliding component in Example 4 of this invention. It is a schematic diagram which shows the sliding component in Example 5 of this invention. It is a schematic diagram which shows the sliding component in Example 6 of this invention.
- the sliding parts according to the first embodiment will be described with reference to FIGS. 1 to 5.
- 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 sliding component of the annular shape 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.
- It is mainly composed of a secondary seal 9 for sealing and an urging means 7 arranged between the case 5 and the static sealing ring 10, and the static sealing ring 10 is axially urged by the urging means 7.
- 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 containing 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.
- resin molded carbon, sintered carbon and the like can be used, including carbon in which carbonaceous and graphitic 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 in a clockwise direction as shown by an arrow.
- a plurality of (8 in the first embodiment) groove mechanisms 14 are evenly arranged in the circumferential direction on the inner diameter side.
- the portion of the sliding surface 11 other than the groove mechanism 14 is a land 12 whose upper portion forms a flat end surface.
- a positive pressure generation mechanism such as a dimple may be formed on the outer diameter side of the sliding surface 11.
- the outline of the groove mechanism 14 will be described with reference to FIGS. 2 and 3.
- the deep groove portion 17 is shown shallower than it actually is.
- the groove mechanism 14 has a concave groove 15 communicating with the inner space S1 and extending in the circumferential direction, and a dynamic pressure generating groove 16 provided on the outer diameter side of the concave groove 15.
- the dynamic pressure generating groove 16 communicates with the concave groove 15.
- the dynamic pressure generating groove 16 includes a deep groove portion 17 extending in the outer diameter direction from the end portion on the upstream side of the relative rotation of the concave groove 15, and a shallow groove portion extending in the circumferential direction from the outer diameter end portion of the deep groove portion 17 toward the downstream side of the relative rotation. It is composed of 18.
- the deep groove portion 17 is a portion where the sealed fluid F is conducted to the shallow groove portion 18, and the shallow groove portion 18 is a portion where dynamic pressure is substantially generated.
- the inner diameter end of the deep groove portion 17 is a communication portion 17A that communicates with the inner space S1 through the concave groove 15.
- the deep groove portion 17 has a bottom surface 17a that is flat in the radial direction and parallel to the flat surface of the land 12, and a wall portion 17b that extends vertically from the outer diameter end of the bottom surface 17a toward the flat surface of the land 12.
- the side surfaces 17c and 17d extending vertically from both side edges of the bottom surface 17a in the circumferential direction toward the flat surface of the land 12.
- the deep groove portion 17 has a constant depth D1 over the radial direction.
- the shallow groove portion 18 extends in the circumferential direction in the circumferential direction in parallel with the inner peripheral surface 10a edge of the static sealing ring 10 in the axial direction, and the start end portion 18A of the relative rotation upstream communicates with the deep groove portion 17 and the end portion of the relative rotation downstream. 18B is blocked by the wall portion 18a. That is, the end portion 18B of the shallow groove portion 18 functions as a closing portion.
- the shallow groove portion 18 has a constant depth D2 over the circumferential direction, and the depth D2 is shallower than the depth D1 (D1> D2).
- the depth D2 of the shallow groove portion 18 can be freely changed, but the depth D2 is preferably 1/10 times or less of the depth D1.
- the concave groove 15 is perpendicular to the flat surface of the land 12 from the outer edge of the bottom surface 15a as an inclined surface that is inclined so as to be deeper from the outer diameter end portion to the inner diameter end portion and the bottom surface 15a excluding the communication portion 17A. It is partitioned by an extending peripheral surface 15b and side surfaces 15c and 15d at both ends of the bottom surface 15a in the circumferential direction. That is, the peripheral surface 15b is also the inner peripheral surface 15b of the land 12 that radially partitions the concave groove 15 and the shallow groove portion 18.
- the peripheral surface 15b is a curved surface having the same diameter as the communication portion 17A and extending downstream of the relative rotation of the communication portion 17A.
- the peripheral surface 15b is arranged on the outer diameter side of the inner peripheral surface 10a of the static sealing ring 10.
- a step having a step in the radial direction due to the inner peripheral surface 10a, the communication portion 17A and the peripheral surface 15b, specifically, axially viewed, the inner peripheral surface 10a, the side surface 15c, and the communication portion 17A and the peripheral surface 15b are used for cranking.
- a step is formed.
- the concave groove 15 has the deepest inner diameter end, that is, the opening communicating with the inner space S1, and the depth D3 is deeper than the depth D1 (D1 ⁇ D3).
- the sealed fluid F in the shallow groove portion 18 moves from the start end portion 18A toward the end portion 18B, and along with this, the sealed fluid F in the deep groove portion 17 Flows into the shallow groove portion 18.
- the pressure of the sealed fluid F in the shallow groove portion 18 that has moved toward the end portion 18B is increased in the wall portion 18a constituting the end portion 18B of the shallow groove portion 18 and its vicinity. That is, a positive pressure is generated in and near the wall portion 18a, the sealed fluid F flows out between the sliding surfaces 11 and 21 as shown by the arrow F11, and the sliding surfaces 11 and 21 are separated from each other to improve lubricity. improves.
- the sealed fluid F in the inner space S1 passes through the concave groove 15 from the inner peripheral surface 10a of the static sealing ring 10 located upstream of the relative rotation of the concave groove 15, and the relative rotation of the concave groove 15. It is roughly classified into a flow F1 flowing toward the inner peripheral surface 10a'of the static sealing ring 10 located downstream and a flow F2 sucked into the deep groove portion 17.
- This flow F1 is a flow generated by a shearing force accompanying the rotation of the sliding surface 21 (see FIG. 1) of the rotary sealing ring 20, flows along the inner peripheral surface 10a of the static sealing ring 10, and has a concave groove 15. At the point, it meanders in the outer diameter direction and flows.
- the flow F2 is a flow in which the flow of the sealed fluid F (see arrows F10 and F11) is generated in the shallow groove portion 18 having a volume smaller than that of the concave groove 15, and is sucked into the communication portion 17A from the concave groove 15. As described above, the flow F2 has a slower speed than the flow F1.
- the flow F1 reaches the peripheral surface 15b beyond the communication portion 17A from the inner peripheral surface 10a of the static sealing ring 10 located on the inner diameter side of the communication portion 17A and the peripheral surface 15b, and flows to the relative rotation downstream side. ing. That is, the inner peripheral surface 10a of the static sealing ring 10 functions as a guiding means for guiding the sealed fluid F in a direction different from that of the communication portion 17A and the peripheral surface 15b.
- the contamination C1 having a large specific gravity contained in the sealed fluid F flows along the flow F1 having a relatively high flow velocity, most of the contamination C1 flows to the peripheral surface 15b downstream of the relative rotation of the communication portion 17A. It is difficult to reach 17A. That is, it is difficult for the contamination C1 having a large specific gravity to enter the dynamic pressure generation groove 16.
- the contamination C1 introduced into the concave groove 15 comes into contact with the bottom surface 15a of the concave groove 15 and is separated from the flow F1, so that the contamination C1 enters the dynamic pressure generation groove 16. It's getting harder to do.
- the side surface 15c (see FIG. 4) upstream of the relative rotation in the concave groove 15 is provided on an extension of the side surface 17c upstream of the relative rotation in the deep groove portion 17. According to this, since the end portion 10b downstream of the relative rotation of the inner peripheral surface 10a of the static sealing ring 10 can be brought closer to the communicating portion 17A in the circumferential direction, a flow F1 that surely exceeds the communicating portion 17A can be formed. ..
- the corners formed by the inner peripheral surface 10a of the static sealing ring 10 and the side surface 15c of the concave groove 15 form a substantially right angle, the direction of the flow F1 and the direction of the flow F2 of the sealed fluid F are significantly different. Since the inertia due to the flow F1 greatly acts on the contamination C1 having a large specific gravity, it is difficult to follow the flow F2 and it is easy to flow along the flow F1.
- the sealed fluid F upstream in the relative rotation direction of the communication portion 17A has the communication portion 17A due to the inner peripheral surface 10a of the static sealing ring 10.
- the flow F2 flows into the peripheral surface 15b extending to the downstream side of the relative rotation of the communication portion 17A, and the flow F2 having a slower speed than the flow F1 flows into the communication portion 17A. Further, the flow rate of the flow F2 is smaller than the flow rate of the flow F1. Since the contamination C1 having a large specific gravity flows along the flow F1 having a relatively high flow velocity, the contamination C1 flows downstream of the relative rotation of the communication portion 17A, and it becomes difficult to reach the communication portion 17A. In this way, since the contamination C1 can be prevented from entering the dynamic pressure generation groove 16, it is possible to prevent the contamination C1 from flowing out between the sliding surfaces 11 and 21 and causing abstract wear.
- a part of the contamination (not shown) having a smaller specific gravity than the contamination C1 may enter the dynamic pressure generation groove 16 along the flow F2, but such a contamination having a small specific density is fragile or soft. In most cases, there is no risk of causing abbreviated wear between the sliding surfaces 11 and 21.
- the embodiment in which the end portion 10b downstream of the relative rotation of the inner peripheral surface 10a of the static sealing ring 10 is provided on the extension line of the side surface 17c of the deep groove portion 17, is not limited to this, and is stationary.
- the end portion of the inner peripheral surface 10a of the sealing ring 10 on the downstream side of the relative rotation may be located upstream of the side surface 17c of the deep groove portion 17. That is, the side surface 15c of the concave groove 15 may have a divergent shape so as to incline toward the upstream of the relative rotation toward the inner diameter side.
- the inner peripheral end portion of the sliding surface 11 is cut out to form the concave groove 15, so that the inner peripheral surface 10a of the static sealing ring 10 and the communication portion 17A and the peripheral surface 15b have a diameter.
- the form of forming a step having a step in the direction is exemplified, but the present invention is not limited to this, and the communication portion of the dynamic pressure generating groove is provided at a position having the same diameter as the inner peripheral surface of the sliding component, and the inner circumference of the sliding component is provided.
- a protruding portion protruding toward the inner diameter side from the surface is provided upstream of the relative rotation of the communicating portion, and a step having a step in the radial direction is formed by the inner peripheral surface of the protruding portion and the inner peripheral surface of the communicating portion and the sliding component. You may.
- the inner peripheral surface of the protrusion functions as a guiding means.
- the end portion 200b of the inner peripheral surface 200a of the static sealing ring 200 on the relative rotation downstream is located on the relative rotation downstream of the side surface 17c of the deep groove portion 17.
- the land 212 has an eaves portion 212a extending downstream from the inner diameter end of the side surface 15c of the concave groove 15 so as to cover the communication portion 17A. That is, the eaves portion 212a overlaps with the communication portion 17A in the radial direction.
- the flow F20 of the sealed fluid F sucked into the deep groove portion 17 is separated from the flow F1 by the eaves portion 212a, so that the contamination C1 flowing along the flow F1 becomes extremely difficult to follow the flow F20. Therefore, it is possible to reliably prevent the contamination C1 (see FIGS. 4 and 5) from entering the dynamic pressure generation groove 16.
- the sliding component of the third embodiment is a so-called bi-rotation type that can handle both clockwise and counterclockwise directions.
- the static sealing ring 300 includes a deep groove portion 17, a shallow groove portion 18 extending in the clockwise direction from the deep groove portion 17, and a shallow groove portion 18 ′ extending in the counterclockwise direction from the deep groove portion 17.
- a dynamic pressure generation groove 316 having a T-shape in the axial direction is provided.
- the concave groove 315A provided on the inner diameter side of the deep groove portion 17 is formed by being cut out to have the same width as the circumferential width of the deep groove portion 17, and lands 312 remain on both sides of the concave groove portion 315A in the circumferential direction. doing.
- the counterclockwise side of the concave groove 315A in FIG. 7 is referred to as a land 312a
- the clockwise side of the concave groove 315A is referred to as a land 312b.
- Concave grooves 315B and 315B'extending in the circumferential direction are formed adjacent to the lands 312 on both sides of the concave groove 315A in the circumferential direction.
- the concave grooves 315B, 315B' have a peripheral surface 315b, 315b' that extends in the circumferential direction with the same diameter as the communication portion 17A across the lands 312a, 312b, and the side surfaces 315c on the land 312a, 312b side of the peripheral surfaces 315b, 315b'. It is partitioned by 315d. As will be described later, the side surfaces 315c and 315d function as guiding means.
- the sealed fluid F upstream of the relative rotation of the communication portion 17A moves along the peripheral surface 315b'of the concave groove 315B', and the direction is changed in the inner diameter direction, that is, in the inner space S1 direction by the side surface 315c. After that, it becomes a flow F30 that flows downstream of the relative rotation beyond the communication portion 17A. As described above, the flow F30 is guided by the side surface 315c in a direction different from the peripheral surface 315b of the communication portion 17A and the concave groove 315B, that is, in the inner diameter direction, so that it is difficult to reach the communication portion 17A.
- the sealed fluid F upstream of the relative rotation of the communication portion 17A moves along the peripheral surface 315b of the concave groove 315B, and is directed in the inner diameter direction, that is, in the inner space S1 direction by the side surface 315d. After being changed, it becomes a flow that flows downstream of the relative rotation beyond the communication portion 17A. As described above, the flow is guided by the side surface 315d in a direction different from the peripheral surface 315b'of the communication portion 17A and the concave groove 315B', that is, in the inner diameter direction, so that it is difficult to reach the communication portion 17A.
- the deep groove portion 17 may extend to the inner peripheral surface 300a of the static sealing ring 300.
- an axially visible L-shaped dynamic pressure generating groove 416 having a deep groove portion 417 and a shallow groove portion 418, and a relative rotation upstream of the deep groove portion 417.
- a recess 420 as a guiding means provided apart from the above is provided. The separation width between the deep groove portion 417 and the recess 420 can be freely changed.
- the communication portion 417A of the deep groove portion 417 is formed to have the same diameter as the inner peripheral surface 400a of the static sealing ring 400, and communicates with the inner space S1.
- the recess 420 has a half-moon shape when viewed in the axial direction, and has a communication portion 420A communicating with the inner space S1. That is, the side wall 420a of the recess 420 forms a semicircular curved surface in the axial direction. Further, the communication portion 420A is formed along the inner peripheral surface 400a of the static sealing ring 400.
- the sealed fluid flows from the inner peripheral surface 400a upstream of the relative rotation of the recess 420 to the downstream of the relative rotation through the recess 420 in the vicinity of the sliding surfaces 411,21.
- a flow F40 of F and a flow F41 of the sealed fluid F sucked into the communication portion 417A from the vicinity of the communication portion 417A are generated.
- the speed of this flow F40 is higher than that of the flow F41.
- the flow F40 moves along the side wall 420a of the recess 420, is changed in the inner diameter direction from the end of the side wall 420a downstream of the relative rotation, that is, to the inner space S1, and then crosses the communication portion 417A to the communication portion 417A. It reaches the inner peripheral surface 400a'as a peripheral surface extending to the downstream side of the relative rotation, and flows to the downstream side of the relative rotation.
- the contaminant C1 having a large specific gravity contained in the sealed fluid F flows along the flow F40 having a relatively high flow velocity, most of the contaminant C1 flows to the inner peripheral surface 400a'on the relative rotation downstream of the communication portion 417A. It is difficult to reach the communication portion 417A. That is, it is difficult for the contamination C1 having a large specific gravity to enter the dynamic pressure generation groove 416.
- the guiding means can be made a simple structure.
- the side wall 420a of the recess 420 has a curved surface in the axial direction, the sealed fluid F in the recess 420 can be smoothly guided along the side wall 420a.
- the sliding surface 511 of the static sealing ring 500 is provided with a dynamic pressure generating groove 416 similar to that of the fourth embodiment and a guiding means provided apart from each other upstream of the relative rotation of the deep groove portion 417.
- a plurality of recesses 520 and the like are provided. The separation width between the deep groove portion 417 and the recess 520 and the separation width between the recesses 520 can be freely changed.
- the recess 520 has a triangular shape when viewed in the axial direction, and has a communication portion 520A that communicates with the inner space S1.
- the recess 520 extends from the outer diameter end of the first side wall 520a while inclining toward the downstream side of relative rotation from the inner peripheral surface 500a of the static sealing ring 500. It is provided with a second side wall 520b as an inclined surface extending in the inner diameter direction while being inclined toward the downstream side of relative rotation.
- a sealed fluid flows from the inner peripheral surface 500a upstream of the relative rotation of the recess 520 to the downstream of the relative rotation through each recess 520 in the vicinity of the sliding surfaces 511,21.
- a flow F50 of the fluid F and a flow F51 of the sealed fluid F sucked into the communication portion 417A from the vicinity of the communication portion 417A are generated.
- the speed of this flow F50 is higher than that of the flow F51.
- the flow F50 moves along the second side wall 520b of the recess 520, is changed in the inner diameter direction from the end of the second side wall 520b downstream of the relative rotation, that is, in the inner space S1 direction, and then crosses the communication portion 417A.
- the communication portion 417A reaches the inner peripheral surface 500a'as a peripheral surface extending to the downstream side of the relative rotation, and flows to the downstream side of the relative rotation.
- the contaminant C1 having a large specific gravity contained in the sealed fluid F flows along the flow F50 having a relatively high flow velocity, most of the contaminant C1 flows to the inner peripheral surface 500a'on the relative rotation downstream of the communication portion 417A. It is difficult to reach the communication portion 417A. That is, it is difficult for the contamination C1 having a large specific gravity to enter the dynamic pressure generation groove 416.
- the recess 520 Since the inner diameter end of the second side wall 520b of the recess 520 forms an inclined surface located on the relative rotation downstream side of the outer diameter end of the second side wall 520b, the recess 520 is formed along the second side wall 520b.
- the sealed fluid F inside can be smoothly guided.
- the guiding means may be an inclined surface having a curved surface in which the second side wall 520b has a protrusion on the outer diameter side instead of the concave portion 520.
- the sliding surface 611 of the static sealing ring 600 is provided with a dynamic pressure generating groove 616 composed of a deep groove portion 617 and a shallow groove portion 618.
- the deep groove portion 617 communicates with the inner space S1 and extends in the circumferential direction, and the wall portion 617c and the wall portion 617d of the deep groove portion 617 are inclined upstream from the inner diameter end toward the outer diameter end and substantially thereof. It extends in parallel.
- the wall portion 617d and the inner peripheral surface 600a of the static sealing ring 600 function as guiding means.
- the shallow groove portion 618 extends in the outer diameter direction from the end portion upstream of the relative rotation of the deep groove portion 617. Specifically, the wall portion 618c and the wall portion 618d of the shallow groove portion 618 are inclined in the downstream of the relative rotation from the inner diameter end to the outer diameter end and extend in parallel.
- the starting end portion 618A of the shallow groove portion 618 functions as a communication portion that communicates with the inner space S1 through the deep groove portion 617.
- the sealed fluid F in the deep groove portion 617'adjacent to the relative rotation upstream of the arbitrary deep groove portion 617 is the peripheral surface 617b'of the deep groove portion 617'.
- the flow F60a flows downstream of the relative rotation beyond the starting end portion 618A, that is, to the peripheral surface 617b.
- the sealed fluid F flowing along the inner peripheral surface 600a of the statically sealed ring 600 upstream of the relative rotation of the starting end portion 618A exceeds the starting end portion 618A and meanders in the outer diameter direction at a position where the deep groove portion 617 exists.
- the flow is F60b.
- the speeds of these flows F60a and F60b are higher than those of the flow F61.
- the contamination C1 having a large specific gravity contained in the sealed fluid F flows along the flows F60a and F60b having a relatively high flow velocity, most of the contamination C1 is the peripheral surface of the peripheral rotation downstream of the starting portion 618A. Since it flows to 617b, it is difficult to reach the starting end portion 618A.
- end portion 600b on the inner peripheral surface 600a of the static sealing ring 600 located downstream of the relative rotation is located downstream of the inner diameter end of the wall portion 618c of the shallow groove portion 618, and the flows F60a and F60b are separated from the flow F61. Therefore, it becomes extremely difficult for the contamination C1 flowing along the flows F60a and F60b to follow the flow F61.
- a dynamic pressure generating groove including a deep groove portion having a communication portion with an inner space and a shallow groove portion having a closed portion has been described as an example, but the dynamic pressure generating groove is a communicating portion. It may be a spiral groove or the like that is inclined in the circumferential direction and extends in the radial direction and has a constant depth in the longitudinal direction.
- the closed portion of the dynamic pressure generating groove may be configured to generate dynamic pressure.
- the cross-sectional area of the end portion of the dynamic pressure generating groove downstream of the relative rotation may gradually decrease in the extending direction.
- the sealed fluid has been described as a high-pressure liquid, the sealed fluid is not limited to this, and may be a gas or a low-pressure liquid, or may be a mist in which a liquid and a gas are mixed.
- the fluid on the leak side is an atmosphere which is a low-pressure gas
- the present invention is not limited to this and may be a liquid or a high-pressure gas, or may be a mist in which a liquid and a gas are mixed.
- 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. It may be the same pressure.
- an example is an example of an outside type that seals the sealed fluid F that leaks from the inner diameter side to the outer diameter side of the sliding surface, but the present invention is not limited to this, and the outer diameter of the sliding surface is not limited to this. It may be an inside type that seals the sealed fluid F that leaks from the side toward the inner diameter side.
- the mechanical seal for general industrial machines has been described as an example, but other mechanical seals for automobiles and water pumps may be used.
- 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 dynamic pressure generating groove may be provided in the rotary sealing ring.
- the concave groove and the concave portion both have a bottom surface, but the present invention is not limited to this, and the concave portion formed in the radial direction of the sliding component along the concave axial direction, in other words, does not have a bottom surface. It may be a recess.
- Static sealing ring (sliding parts) 10a Inner peripheral surface (guidance means) 11 Sliding surface 12 Land 15 Concave groove 15a Bottom surface (inclined surface) 15b Peripheral surface 16 Dynamic pressure generation groove 17A Communication part 18B Termination part (closed part) 20 Rotating sealed ring (other sliding parts) 21 Sliding surface 200 Static sealing ring (sliding parts) 200a Inner peripheral surface (guidance means) 212a Eaves 300 Static Sealed Ring (Sliding Parts) 315b, 315b'Peripheral surface 315c, 315d Side surface 316 Dynamic pressure generation groove 400 Static sealing ring (sliding part) 400a'Inner peripheral surface (peripheral surface) 416 Dynamic pressure generation groove 420 Recess (induction means) 420a Side wall 500 Static sealing ring (sliding part) 500a'Inner peripheral surface (peripheral surface) 520 Recess (guidance means) 520b Second side wall A Atmosphere
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Sealing (AREA)
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (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連通部と該連通部よりも相対回転下流の閉塞部とを有する動圧発生溝が設けられ、
前記摺動部品は、前記連通部の相対回転下流に延びる周面と異なる方向に前記外部空間内の流体を誘導する誘導手段を前記連通部の相対回転方向上流に備えている。
これによれば、摺動部品の相対回転時には、連通部の相対回転方向上流の流体は、誘導手段により、連通部に向かわず連通部の相対回転下流側に流れ、連通部には当該流れに比べ速度の遅い流体が流れ込んでおりその流量も少ない。比重が大きいコンタミは流速の比較的速い当該流れに沿って流れるため、コンタミは連通部の相対回転下流に流れることとなり連通部に到達しにくくなる。このようにして、コンタミが動圧発生溝内に進入することを抑制できる。
これによれば、相対回転上流の周面と相対回転下流の周面とにより径方向に段を有する段差が形成され、連通部よりも相対回転上流の流体を相対回転下流の周面と異なる方向に誘導させ、コンタミが動圧発生溝内に進入することを抑制できる。
これによれば、コンタミが動圧発生溝内に進入することを確実に抑制できる。
これによれば、外部空間内の流体が連通部に導入されるときに、比重が大きいコンタミは傾斜面に接触して流体の流れから分離されるので、コンタミが動圧発生溝内に進入することを抑制できる。
これによれば、凹部により外部空間内の流体を連通部の相対回転下流側の周面と異なる方向に誘導できるので、誘導手段を簡素な構造とすることができる。
これによれば、側壁に沿って凹部内の流体が円滑に誘導される。
これによれば、傾斜面に沿って凹部内の流体が円滑に誘導される。
10a 内周面(誘導手段)
11 摺動面
12 ランド
15 凹溝
15a 底面(傾斜面)
15b 周面
16 動圧発生溝
17A 連通部
18B 終端部(閉塞部)
20 回転密封環(他の摺動部品)
21 摺動面
200 静止密封環(摺動部品)
200a 内周面(誘導手段)
212a 庇部
300 静止密封環(摺動部品)
315b,315b’ 周面
315c,315d 側面
316 動圧発生溝
400 静止密封環(摺動部品)
400a’ 内周面(周面)
416 動圧発生溝
420 凹部(誘導手段)
420a 側壁
500 静止密封環(摺動部品)
500a’ 内周面(周面)
520 凹部(誘導手段)
520b 第2側壁
A 大気
C1 コンタミ
F 被密封流体
S1 内空間(外部空間)
S2 外空間(外部空間)
Claims (7)
- 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連通部と該連通部よりも相対回転下流の閉塞部とを有する動圧発生溝が設けられ、
前記摺動部品は、前記連通部の相対回転下流に延びる周面と異なる方向に前記外部空間内の流体を誘導する誘導手段を前記連通部の相対回転方向上流に備えている摺動部品。 - 前記誘導手段は、前記相対回転下流の周面よりも前記外部空間側に配置された前記相対回転上流の周面である請求項1に記載の摺動部品。
- 前記誘導手段は前記連通部と径方向に重畳する位置まで延びている請求項2に記載の摺動部品。
- 前記連通部から前記外部空間に向けて深くなるように傾斜する傾斜面を備えている請求項2または3に記載の摺動部品。
- 前記誘導手段は、前記摺動面に設けられ前記外部空間に開口する凹部である請求項1に記載の摺動部品。
- 前記凹部の側壁は、軸方向視で曲面をなしている請求項5に記載の摺動部品。
- 前記凹部の側壁は、前記外部空間側の端部から前記連通部側に離れる方向に周方向に傾斜して径方向に延びる傾斜面をなしている請求項5または6に記載の摺動部品。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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CN202180033197.7A CN115552155A (zh) | 2020-05-11 | 2021-04-28 | 滑动部件 |
EP21804030.1A EP4151870A4 (en) | 2020-05-11 | 2021-04-28 | SLIDING COMPONENT |
KR1020227039593A KR20230002688A (ko) | 2020-05-11 | 2021-04-28 | 슬라이딩 부품 |
JP2022521825A JPWO2021230081A1 (ja) | 2020-05-11 | 2021-04-28 | |
US17/923,565 US20230184288A1 (en) | 2020-05-11 | 2021-04-28 | Sliding component |
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JP2020083388 | 2020-05-11 | ||
JP2020-083388 | 2020-05-11 |
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PCT/JP2021/016916 WO2021230081A1 (ja) | 2020-05-11 | 2021-04-28 | 摺動部品 |
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US (1) | US20230184288A1 (ja) |
EP (1) | EP4151870A4 (ja) |
JP (1) | JPWO2021230081A1 (ja) |
KR (1) | KR20230002688A (ja) |
CN (1) | CN115552155A (ja) |
WO (1) | WO2021230081A1 (ja) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012046749A1 (ja) | 2010-10-06 | 2012-04-12 | イーグル工業株式会社 | 摺動部品 |
WO2016035860A1 (ja) * | 2014-09-04 | 2016-03-10 | イーグル工業株式会社 | メカニカルシール |
WO2019013233A1 (ja) * | 2017-07-13 | 2019-01-17 | イーグル工業株式会社 | 摺動部材 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH06105105B2 (ja) * | 1989-03-03 | 1994-12-21 | 日本ピラー工業株式会社 | 端面非接触形メカニカルシール |
JP6798776B2 (ja) * | 2015-10-16 | 2020-12-09 | 株式会社リケン | シールリング |
EP3816488B1 (en) * | 2018-05-17 | 2023-09-27 | Eagle Industry Co., Ltd. | Seal ring |
-
2021
- 2021-04-28 US US17/923,565 patent/US20230184288A1/en active Pending
- 2021-04-28 EP EP21804030.1A patent/EP4151870A4/en active Pending
- 2021-04-28 WO PCT/JP2021/016916 patent/WO2021230081A1/ja unknown
- 2021-04-28 KR KR1020227039593A patent/KR20230002688A/ko unknown
- 2021-04-28 CN CN202180033197.7A patent/CN115552155A/zh active Pending
- 2021-04-28 JP JP2022521825A patent/JPWO2021230081A1/ja active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012046749A1 (ja) | 2010-10-06 | 2012-04-12 | イーグル工業株式会社 | 摺動部品 |
WO2016035860A1 (ja) * | 2014-09-04 | 2016-03-10 | イーグル工業株式会社 | メカニカルシール |
WO2019013233A1 (ja) * | 2017-07-13 | 2019-01-17 | イーグル工業株式会社 | 摺動部材 |
Non-Patent Citations (1)
Title |
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See also references of EP4151870A4 |
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KR20230002688A (ko) | 2023-01-05 |
EP4151870A1 (en) | 2023-03-22 |
EP4151870A4 (en) | 2024-05-29 |
JPWO2021230081A1 (ja) | 2021-11-18 |
US20230184288A1 (en) | 2023-06-15 |
CN115552155A (zh) | 2022-12-30 |
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