WO2017002691A1 - 摺動部品 - Google Patents
摺動部品 Download PDFInfo
- Publication number
- WO2017002691A1 WO2017002691A1 PCT/JP2016/068586 JP2016068586W WO2017002691A1 WO 2017002691 A1 WO2017002691 A1 WO 2017002691A1 JP 2016068586 W JP2016068586 W JP 2016068586W WO 2017002691 A1 WO2017002691 A1 WO 2017002691A1
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- WO
- WIPO (PCT)
- Prior art keywords
- sealing ring
- groove
- side sealing
- sliding
- fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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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
- 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
- F16J15/3416—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 with at least one continuous groove
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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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/12—Shaft sealings using sealing-rings
- F04D29/122—Shaft sealings using sealing-rings especially adapted for elastic fluid pumps
-
- 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
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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
- 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
- F16C33/06—Sliding surface mainly made of metal
- F16C33/10—Construction relative to lubrication
- F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
- F16C33/106—Details of distribution or circulation inside the bearings, e.g. details of the bearing surfaces to affect flow or pressure of the liquid
- F16C33/1065—Grooves on a bearing surface for distributing or collecting the liquid
-
- 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
- F16C33/06—Sliding surface mainly made of metal
- F16C33/10—Construction relative to lubrication
- F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
- F16C33/106—Details of distribution or circulation inside the bearings, e.g. details of the bearing surfaces to affect flow or pressure of the liquid
- F16C33/107—Grooves for generating pressure
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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
- 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
- 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
- F16C33/741—Sealings of sliding-contact bearings by means of a fluid
- F16C33/743—Sealings of sliding-contact bearings by means of a fluid retained in the sealing gap
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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
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/784—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race
- F16C33/7843—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc
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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
- F16J15/162—Special parts or details relating to lubrication or cooling of the sealing itself
-
- 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
- F16J15/3464—Mounting of the seal
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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
- F16J15/36—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member connected by a diaphragm or bellow to the other member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2240/00—Components
- F05D2240/55—Seals
Definitions
- the present invention relates to a sliding part suitable for a sliding part, for example, a mechanical seal, a bearing, and the like.
- the present invention relates to a sliding component such as a seal ring or a bearing that requires a fluid to be interposed in the sliding surface to reduce friction and prevent fluid from leaking from the sliding surface.
- a mechanical seal which is an example of a sliding component
- its performance is evaluated by a leakage amount, a wear amount, and a torque.
- the performance is improved by optimizing the sliding material and sliding surface roughness of the mechanical seal, and low leakage, long life, and low torque are realized.
- further improvement in the performance of mechanical seals is required, and technical development that exceeds the framework of conventional techniques is required.
- the present invention promotes fluid circulation on the sliding surface while maintaining the contradictory conditions of sealing and lubrication, prevents deposits on the sliding surface, and maintains the sealing function of the sliding surface for a long period of time.
- An object of the present invention is to provide a sliding part that can be made to move.
- the sliding component of the present invention firstly includes a pair of sliding components that slide relative to each other, one sliding component is a fixed-side sealing ring, and the other sliding component is A rotation-side sealing ring having a fluid circulation groove communicated with a high-pressure fluid side through an inlet portion and an outlet portion and separated from a low-pressure fluid side by a land portion on a sliding surface of the fixed-side sealing ring.
- the rotating side sealing ring is provided with a larger outer diameter and a smaller inner diameter than the stationary side sealing ring, and a rotational force transmission for transmitting the rotational force of the rotating shaft to the outer periphery of the rotating side sealing ring.
- a groove in which a claw of the member is loosely fitted is provided, and the circumferential width of the groove is smaller than the circumferential length of the inlet portion and the outlet portion of the fluid circulation groove, and the rotation-side sealing ring
- the surface width between the inner diameter of the groove and the inner diameter of the sliding surface of the fixed seal ring is WMR, and the width of the sliding surface of the fixed seal ring
- WSR is WSR, it is characterized in that it is set within the range of 0.75 ⁇ WMR / WSR ⁇ 1.4.
- the sliding component of the present invention is secondly characterized in that, in the first feature, a plurality of the grooves are provided in the circumferential direction, and one of the plurality of grooves is an inlet portion of one fluid circulation groove. When it is in a position facing the other, the other groove is arranged so as not to be in a position facing the outlet portion of the fluid circulation groove. According to this feature, the pressure difference between the inlet portion and the outlet portion of the fluid circulation groove can be increased and reliably generated, and the generation of deposits in the fluid circulation groove can be further prevented. .
- the sliding surface of the fixed-side sealing ring is provided with a fluid circulation groove that communicates with the high-pressure fluid side through the inlet and outlet portions and is isolated from the low-pressure fluid side by the land portion.
- the ring has a large outer diameter and a small inner diameter with respect to the fixed-side sealing ring, and a groove in which a claw of a rotational force transmitting member that transmits the rotational force of the rotating shaft is loosely fitted on the outer periphery of the rotational-side sealing ring
- the circumferential width of the groove is smaller than the circumferential length of the inlet and outlet portions of the fluid circulation groove, and the inner diameter of the rotary seal ring and the fixed seal ring slide.
- the surface width between the inner surface of the moving surface is WMR and the surface width of the sliding surface of the fixed-side sealing ring is WSR, it should be set within the range of 0.75 ⁇ WMR / WSR ⁇ 1.4. Due to this, there is a pressure difference between the inlet and outlet of the fluid circulation groove, and it is constantly changing alternately. Since the fluid in the fluid circulation groove repeatedly moves, even if the sealed fluid contains a substance that causes deposits, it is possible to prevent the formation of deposits in the fluid circulation groove and to seal the sliding surface over a long period of time. Can be maintained.
- a plurality of grooves are provided in the circumferential direction, and when one of the plurality of grooves is at a position facing the inlet portion of one fluid circulation groove, the other groove is an outlet of the fluid circulation groove.
- the pressure difference between the inlet portion and the outlet portion of the fluid circulation groove can be made large and surely generated, and the generation of deposits in the fluid circulation groove Can be further prevented.
- FIG. 2 is a cross-sectional view taken along the line AA of the sliding part of FIG. 1 and is cut at a portion close to the sliding surface in order to explain the characteristics of the sliding surface.
- FIG. 3 is a diagram similar to FIG. 2, showing Example 2.
- Example 1 of this invention With reference to FIG.1 and FIG.2, the sliding component which concerns on Example 1 of this invention is demonstrated.
- a mechanical seal which is an example of a sliding component will be described as an example.
- the outer peripheral side of the sliding part constituting the mechanical seal is described as the high pressure fluid side (sealed fluid side), and the inner peripheral side is described as the low pressure fluid side (atmosphere side).
- FIG. 1 is a longitudinal sectional view showing an example of a mechanical seal, which is an inside type that seals a sealed fluid on a high-pressure fluid side that is about to leak from the outer periphery of the sliding surface toward the inner peripheral direction.
- An annular rotation-side seal ring 5 is provided, and the cartridge 4 slides opposite to the rotation-side seal ring 5 and is an annular fixed-side seal ring 6 that is the other sliding part that is movable in the axial direction.
- a cup gasket 9 is provided between the sleeve 2 and the rotation-side sealing ring 5. That is, this mechanical seal prevents the sealed fluid from flowing out from the outer periphery of the rotating shaft 1 to the atmosphere side on the sliding surfaces S of the rotating side sealing ring 5 and the fixed side sealing ring 6. .
- the sleeve 2 functions as a rotational force transmitting member that transmits the rotational force of the rotary shaft 1 to the rotary seal ring 5.
- the sleeve 2 is fitted to the rotary shaft 1 and the high pressure of the inner cylindrical portion 2 a. It has a disk part 2b extending in the outer diameter direction from the fluid side, and an outer cylinder part 2c extending from the outer diameter side of the disk part 2b to the low pressure fluid side, and a cup gasket 9 is provided on the low pressure fluid side of the substantially U-shaped cross section.
- the rotation side sliding ring 5 is held.
- the cup gasket 9 is provided across the anti-sliding surface side and the inner peripheral surface of the rotation-side sliding ring 5.
- one of the sliding surface widths is made large so that it is possible to cope with the case where the rotation centers of the rotation-side sealing ring 1 and the stationary-side sealing ring 5 do not exactly match, that is, The outer diameter is increased and the inner diameter is decreased to form the outer diameter side sliding surface allowance So and the inner diameter side sliding surface allowance Si.
- the part in which the rotation-side seal ring 5 and the stationary-side seal ring 6 are actually slid is referred to as a slide part Ss. To do.
- a slide part Ss To do.
- the outer diameter of the rotation-side seal ring 5 is larger than the outer diameter of the fixed-side seal ring 6, and the inner diameter of the rotation-side seal ring 5 is smaller than the inner diameter of the fixed-side seal ring 6.
- a moving surface allowance So and an inner diameter side sliding surface allowance Si are formed in the rotation-side seal ring 5.
- the outer diameter and the inner diameter of the sliding portion Ss and the sliding surface S of the fixed-side sealing ring 6 are the same.
- the material of the rotating side sealing ring 5 and the stationary side sealing ring 6 is selected from silicon carbide (SiC) having excellent wear resistance and carbon having excellent self-lubricating properties.
- SiC silicon carbide
- both are SiC or rotating.
- the side sealing ring 5 can be made of SiC and the stationary side sealing ring 6 can be combined with carbon.
- FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, in which the sliding portion Ss of the stationary-side sealing ring 6 is shown by hatching, and there is a recess (groove) as a surface texture formed on the sliding surface. It is shown in white. The concave portion (groove) as the surface texture will be described in detail later.
- the outer diameter side of the sliding surface S is the high-pressure fluid side
- the inner diameter side is the low-pressure fluid side, for example, the atmosphere side
- the rotation-side sealing ring 5 is rotated counterclockwise.
- the outer cylinder portion 2c of the sleeve 2 is provided intermittently and partially in the circumferential direction.
- the outer cylinder portion 2c has a claw shape having a constant width in the circumferential direction, and 4 etc. in the circumferential direction. Is provided.
- the tip in the axial direction of the outer cylinder portion 2 c extends to the front of the sliding surface S of the rotation side sealing ring 5.
- the claw-like outer tube portion 2c may be called a claw.
- grooves 15 in which the claws 2 c are loosely fitted are provided in the circumferential direction on the outer periphery of the rotation-side seal ring 5 in four equal intervals, and the claws 2 c are loosely fitted in the grooves 15.
- the claws 2c and the grooves 15 are not limited to four, but may be one or more, and are not limited to equal distribution.
- the sliding surface S of the fixed-side sealing ring 6 is a hatched portion, and the surface width is WSR.
- the sliding surface S of the rotating side sealing ring 5 is provided with a sliding surface margin allowance So on the outer diameter side and a sliding surface margin allowance Si on the inner diameter side.
- the diameter of the bottom portion 15a of the groove 15 (in the present invention, sometimes referred to as “groove inner diameter”) 15a is larger than the outer diameter 6a of the sliding surface of the stationary seal ring 6.
- WMR / WSR is set to 1.4 or less.
- WMR / WSR is set to 1.2 or less. More preferably, WMR / WSR is set to 1.1 or less. The reason for this will be described in detail later.
- the sliding surface S of the fixed-side sealing ring 6 communicates with the high-pressure fluid side, and the low-pressure fluid side is the smooth portion R of the sliding surface (in the present invention, the “land portion”).
- the fluid circulation grooves 10 isolated by (1) are provided in the circumferential direction at four equal intervals.
- the fluid circulation groove 10 is a recess (groove) as the surface texture described above. Note that the number of the fluid circulation grooves 10 is not limited to four, and at least one fluid circulation groove 10 may be provided.
- the fluid circulation groove 10 includes an inlet portion 10a that enters from the high-pressure fluid side, an outlet portion 10b that exits to the high-pressure fluid side, and a communication portion 10c that communicates the inlet portion 10a and the outlet portion 10b in the circumferential direction.
- the fluid circulation groove 10 plays a role of positively introducing and discharging the sealed fluid from the high-pressure fluid side to the sliding portion in order to prevent the fluid containing the corrosion products and the like from being concentrated in the sliding portion Ss.
- the inlet portion 10a and the outlet portion 10b are formed in a wide mouth as shown in the figure so that the sealed fluid is taken into the sliding portion in accordance with the rotation of the mating sliding surface and is easily discharged. In order to reduce leakage, the low pressure fluid side is isolated by the land portion R.
- the inlet portion 10a and the outlet portion 10b are formed in a straight line and are substantially V-shaped.
- the present invention is not particularly limited to this, and an inner angle ⁇ formed between the inlet portion 10a and the outlet portion 10b is determined. It may be larger or smaller, and may be curved (such as an arc) instead of linear.
- the width and depth of the fluid circulation groove 10 are set to optimum values according to the pressure and type (viscosity) of the sealed fluid. An example of the depth is about 100 to 300 ⁇ m.
- the fluid circulation groove 10 is not limited to a substantially V shape, and may be, for example, a U shape. In short, the fluid circulation groove 10 only needs to have an inlet and an outlet connected to the high pressure fluid side.
- the rotation-side sealing ring 5 when the surface width between the inner diameter 15a of the groove 5 and the inner diameter 6b of the sliding surface S of the stationary seal ring 6 is WMR, and the surface width of the sliding surface S of the stationary seal ring 6 is WSR. Since / WSR is set to 1.4 or less, the groove 15 functions as an interference groove that causes a pressure fluctuation with respect to the fluid in the fluid circulation groove 10.
- the groove 15 communicates with the high-pressure fluid side, and is provided in the radial direction so as to be close to the inlet portion 10a and the outlet portion 10b of the fluid circulation groove 10 from the sliding surface allowance So. Pressure fluctuation is caused to the fluid at the inlet 10a and the outlet 10b.
- the groove 15 plays a role of reliably transmitting the rotational force of the rotary shaft 1 to the rotary seal ring 5 and prevents the fluid containing the corrosion products and the like from being concentrated in the sliding portion Ss. This produces an effect of causing pressure fluctuations in the fluid in the fluid circulation groove 10 to prevent the generation of deposits in the fluid circulation groove 10.
- the shape of the groove 15 is substantially rectangular in FIG. 2, but is not limited thereto, and may be, for example, a circle, an ellipse, or a rhombus. It suffices if the bottom portion 15a on the inner diameter side is connected to the inlet portion 10a and the outlet portion 10b of the fluid circulation groove 10 in a position close to each other in the radial direction.
- the grooves 15 are provided in four equal parts in the circumferential direction.
- the circumferential width of each of the plurality of grooves 15 is the circumference of the inlet portion 10 a and the outlet portion 10 b of the fluid circulation groove 10. Since the length is set smaller than the length in the direction, one groove 15 does not face the inlet portion 10a and the outlet portion 10b of the fluid circulation groove 10 at the same time. In the case of FIG.
- the fluid circulation grooves 10 are arranged in four equal parts, and the central angle ⁇ 1 formed by the inlet portion 10a and the outlet portion 10b of the fluid circulation groove 10 is about 45 °, whereas adjacent grooves are 15 is 90 °, so that when the rotation-side sealing ring 5 rotates and any one of the grooves 15 faces the inlet portion 10a of one fluid circulation groove 10, The groove 10 is not located at a position facing the outlet 10 b of the fluid circulation groove 10.
- Example 1 the following remarkable effects are exhibited.
- the sliding surface of the fixed-side seal ring 6 is provided with a fluid circulation groove 10 that communicates with the high-pressure fluid side through the inlet portion 10a and the outlet portion 10b and is separated from the low-pressure fluid side by the land portion R.
- the rotation-side sealing ring 5 has a larger outer diameter than that of the stationary-side sealing ring 6 and a smaller inner diameter, and a rotational force transmitting member that transmits the rotational force of the rotation shaft to the outer periphery of the rotation-side sealing ring 5
- a groove 15 in which the claw 2c is loosely fitted is provided, and the circumferential width of the groove 15 is smaller than the circumferential length of the inlet portion a and the outlet portion of the fluid circulation groove, and the rotation side sealing is performed.
- any one of the grooves 15 is located at a position facing the inlet 10a of the fluid circulation groove 10, the other grooves 15 are in fluid circulation. Since the groove 10 is disposed so as not to face the outlet portion 10b, the pressure difference between the inlet portion 10a and the outlet portion 10b of the fluid circulation groove 10 can be made large and surely generated. Generation of deposits in the circulation groove 10 can be further prevented.
- Example 2 of this invention With reference to FIG. 3, the sliding component which concerns on Example 2 of this invention is demonstrated.
- the second embodiment is different from the first embodiment in that the inner diameter of the groove 15 is set smaller than the outer diameter 6a of the sliding surface of the stationary seal ring 6, but other basic matters are the same as those of the first embodiment. The same.
- the same reference numerals as those in FIG. 2 indicate the same members, and duplicate descriptions are omitted.
- the diameter of the bottom 15a of the groove 15 provided on the outer periphery of the rotation-side seal ring 5, that is, the inner diameter of the groove 15 is set smaller than the outer diameter 6a of the sliding surface of the fixed-side seal ring 6.
- the surface width between the inner diameter 15a of the groove of the rotating side seal ring 5 and the inner diameter 6b of the sliding surface S of the fixed side sealing ring 6 is WMR, and the surface width of the sliding surface S of the fixed side sealing ring 6 is WSR.
- WMR / WSR is set to 0.75 or more.
- WMR / WSR is set to 0.85 or more. More preferably, WMR / WSR is set to 0.95 or more.
- the rotation-side seal ring 5 When the surface width between the inner diameter 15a of the groove and the inner diameter 6b of the sliding surface S of the stationary seal ring 6 is WMR, and the surface width of the sliding surface S of the stationary seal ring 6 is WSR, WMR / Since the WSR is set to 0.75 or more, the groove 15 functions as an interference groove that causes a pressure fluctuation to the fluid in the fluid circulation groove 10 further.
- the groove 15 communicates with the high-pressure fluid side, extends in the radial direction from the sliding surface margin So to the sliding portion Ss, and is provided to overlap the inlet portion 10a and the outlet portion 10b of the fluid circulation groove 10. Therefore, a further pressure fluctuation is caused to the fluid in the inlet portion 10a and the outlet portion 10b of the fluid circulation groove 10.
- the groove 15 plays a role of reliably transmitting the rotational force of the rotary shaft 1 to the rotary seal ring 5 and prevents the fluid containing the corrosion products and the like from being concentrated in the sliding portion Ss. This produces an effect of preventing the generation of deposits in the fluid circulation groove 10 by causing a better pressure fluctuation to the fluid in the fluid circulation groove 10.
- the fluid circulation groove is provided in the stationary seal ring of the mechanical seal constituting the sliding component and the groove is provided in the outer periphery of the rotation-side seal ring
- the rotation side sealing ring may be provided with a fluid circulation groove
- the fixed side sealing ring may be provided with a groove.
- a sliding surface margin is provided on the fixed-side sealing ring.
- the case where the inner diameters of all the grooves are larger and smaller than the outer diameter of the sliding surface of the stationary seal ring has been described.
- a plurality of these may be provided in the direction to mix these forms.
- the inside seal in which the outer peripheral side of the sliding component constituting the mechanical seal is the high-pressure fluid side (sealed fluid side) and the inner peripheral side is the low-pressure fluid side (atmosphere side) will be described.
- the present invention is not limited to these and can be applied to an outside type seal.
- FIG. 2 and FIG. 3 show the case where the claw 2c is located at the center in the circumferential direction of the groove 15, but the claw 2c is not limited to this, and the claw 2c is arranged in the circumferential direction of the groove 15. It may be arranged close to any one end side.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Sealing (AREA)
Abstract
Description
そのような中で、例えば、水冷式エンジンの冷却に用いられるウォーターポンプのメカニカルシールにおいては、時間の経過とともに不凍液の1種であるLLCの添加剤、例えばシリケートやリン酸塩など(以下、「堆積物発生原因物質」という。)が、摺動面で濃縮され、堆積物が生成されメカニカルシールの機能が低下するおそれのあることが本件発明者において確認された。この堆積物の生成は薬品やオイルを扱う機器のメカニカルシールにおいても同様に発生する現象と考えられる。
この特徴によれば、流体循環溝の入口部と出口部とにおいて、圧力差が存在し、それが絶えず交互に変動している状態になり、流体循環溝内おける流体は移動を繰り返すため、被密封流体が堆積物発生原因物質を含む場合でも、流体循環溝における堆積物の発生を防止することができ、長期間にわたり摺動面の密封機能を維持させることができる。
この特徴によれば、流体循環溝の入口部と出口部との圧力差を大きく、かつ、確実に生じさせることができ、流体循環溝における堆積物の発生を、より一層、防止することができる。
(1)固定側密封環の摺動面には、入口部及び出口部を介して高圧流体側に連通され、低圧流体側とはランド部により隔離された流体循環溝が設けられ、回転側密封環は固定側密封環に対して外径が大きく、かつ、内径が小さく形成され、回転側密封環の外周には回転軸の回転力を伝達する回転力伝達部材の爪が遊嵌される溝が設けられ、溝の周方向の幅は、流体循環溝の入口部と出口部との周方向の長さに比べて小さく、かつ、回転側密封環の溝の内径と固定側密封環の摺動面の内径との間の面幅をWMRとし、固定側密封環の摺動面の面幅をWSRとした場合、0.75<WMR/WSR<1.4の範囲内に設定されることにより、流体循環溝の入口部と出口部とにおいて、圧力差が存在し、それが絶えず交互に変動している状態になり、流体循環溝内おける流体は移動を繰り返すため、被密封流体が堆積物発生原因物質を含む場合でも、流体循環溝における堆積物の発生を防止することができ、長期間にわたり摺動面の密封機能を維持させることができる。
なお、以下の実施例においては、摺動部品の一例であるメカニカルシールを例にして説明する。また、メカニカルシールを構成する摺動部品の外周側を高圧流体側(被密封流体側)、内周側を低圧流体側(大気側)として説明する。
すなわち、このメカニカルシールは、回転側密封環5と固定側密封環6との互いの摺動面Sにおいて、被密封流体が回転軸1の外周から大気側へ流出するのを防止するものである。
カップガスケット9は回転側摺動環5の反摺動面側及び内周面に跨って設けられる。
図1においては、回転側密封環5の外径が固定側密封環6の外径より大きく、また、回転側密封環5の内径が固定側密封環6の内径より小さく、外径側の摺動面余裕代So及び内径側の摺動面余裕代Siが回転側密封環5に形成されている。
図1の場合、固定側密封環6の摺動部分Ssと摺動面Sとの外径及び内径は一致している。
図2において、摺動面Sの外径側が高圧流体側であり、また、内径側が低圧流体側、例えば大気側であり、回転側密封環5は反時計方向に回転するものとする。
なお、本発明においては、爪状の外筒部2cを爪と呼ぶことがある。
一方、回転側密封環5の外周には、爪2cが遊嵌される溝15が周方向に4等配で設けられ、溝15内に爪2cが遊嵌されるようになっている。
爪2c及び溝15は、4等配に限らず、1以上あればよく、また、等配に限らない。
爪2cが溝15内に遊嵌されることにより、回転軸1の回転力は回転側密封環5に確実に伝達される。
回転側密封環5の外周に溝15が設けられ、溝15の内径が固定側密封環6の摺動面の外径6aに対して大きく設定される場合、回転側密封環5の溝の内径15aと固定側密封環6の摺動面Sの内径6bとの間の面幅をWMRとすると、WMR/WSRは、1.4以下に設定される。好ましくは、WMR/WSRは、1.2以下に設定される。より好ましくは、WMR/WSRは、1.1以下に設定される。
この理由については、後に詳しく説明する。
なお、流体循環溝10は4個に限らず、少なくとも1個設けられればよく、また、等配である必要もない。
また、図2の場合、流体循環溝10は4等配で設けられ、流体循環溝10の入口部10aと出口部10bとのなす中心角θ1は約45°であるのに対し、隣接する溝15のなす中心角θは90°であるから、回転側密封環5が回動して、いずれかの溝15が1つの流体循環溝10の入口部10aに対向する位置にあるとき、他の溝10は流体循環溝10の出口部10bに対向する位置にはない。
いま、溝15の1つが、ある流体循環溝10の入口部10aに対向する位置に達すると、入口部10a内の流体の圧力が上昇する。この際、出口部10bに対向する位置には他の干渉溝15がないように設定されているため、該出口部10b内の流体の圧力上昇はなく、入口部10aの圧力>出口部10b、の圧力の状態になる。
次に、該溝15が、その流体循環溝10の出口部10bに対向する位置に達すると、出口部10b内の流体の圧力が上昇する。この際、入口部10aに対向する位置には他の溝15がないように設定されているため、該入口部10b内の流体の圧力上昇はなく、入口部10aの圧力<出口部10bの圧力、の状態になる。
すなわち、1つの流体循環溝10に着目すると、溝15の作用により、入口部10aと出口部10bとの圧力差が存在し、それが絶えず交互に変動している状態になる。
(1)固定側密封環6の摺動面には、入口部10a及び出口部10bを介して高圧流体側に連通され、低圧流体側とはランド部Rにより隔離された流体循環溝10が設けられ、回転側密封環5は固定側密封環6に対して外径が大きく、かつ、内径が小さく形成され、回転側密封環5の外周には回転軸の回転力を伝達する回転力伝達部材の爪2cが遊嵌される溝15が設けられ、溝15の周方向の幅は、流体循環溝の入口部aと出口部との周方向の長さに比べて小さく、かつ、回転側密封環5の溝の内径15aと固定側密封環6の摺動面Sの内径6bとの間の面幅をWMRとし、固定側密封環6の摺動面Sの面幅をWSRとした場合、WMR/WSRは1.4以下に設定されているため、流体循環溝10の入口部10aと出口部10bとにおいて、圧力差が存在し、それが絶えず交互に変動している状態になり、流体循環溝10内おける流体は移動を繰り返すため、被密封流体が堆積物発生原因物質を含む場合でも、流体循環溝10における堆積物の発生を防止することができ、長期間にわたり摺動面の密封機能を維持させることができる。
(2)溝15は、周方向に複数設けられ、これら複数の溝15は、いずれかの溝15が流体循環溝10の入口部10aに対向する位置にあるとき、他の溝15が流体循環溝10の出口部10bに対向する位置にないように配設されるため、流体循環溝10の入口部10aと出口部10bとの圧力差を大きく、かつ、確実に生じさせることができ、流体循環溝10における堆積物の発生を、より一層、防止することができる。
実施例2は、溝15の内径が、固定側密封環6の摺動面の外径6aより小さく設定される点で実施例1と相違するが、その他の基本的な事項は実施例1と同じである。
なお、図3において、図2と同じ符号は同じ部材を示しており、重複する説明は省略する。
2 スリーブ
2a 内筒部
2b 円盤部
2c 外筒部
3 ハウジング
4 カートリッジ
5 回転側密封環
6 固定側密封環ハウジング
7 コイルドウェーブスプリング
8 ベローズ
9 カップガスケット
10 流体循環溝
10a 入口部
10b 出口部
10c 連通部
15 溝
15a 溝の底部
R ランド部
S 摺動面
Ss 摺動部分
So 外径側の摺動面余裕代
Si 内径側の摺動面余裕代
Claims (2)
- 互いに相対摺動する一対の摺動部品を備え、 一方の摺動部品は固定側密封環であり、他方の摺動部品は回転側密封環であって、前記固定側密封環の摺動面には、入口部及び出口部を介して高圧流体側に連通され、低圧流体側とはランド部により隔離された流体循環溝が設けられ、前記回転側密封環は前記固定側密封環に対して外径が大きく、かつ、内径が小さく形成され、前記回転側密封環の外周には回転軸の回転力を伝達する回転力伝達部材の爪が遊嵌される溝が設けられ、前記溝の周方向の幅は、流体循環溝の入口部と出口部との周方向の長さに比べて小さく、かつ、回転側密封環の溝の内径と固定側密封環の摺動面の内径との間の面幅をWMRとし、固定側密封環の摺動面の面幅をWSRとした場合、0.75<WMR/WSR<1.4の範囲内に設定されることを特徴とする摺動部品。
- 前記溝は、周方向に複数設けられ、これら複数の溝は、いずれかの溝が1つの流体循環溝の入口部に対向する位置にあるとき、他の溝が当該流体循環溝の出口部に対向する位置にないように配設されることを特徴とする請求項1に記載の摺動部品。
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| WO2020040234A1 (ja) | 2018-08-24 | 2020-02-27 | イーグル工業株式会社 | 摺動部材 |
| EP3862600B1 (en) | 2018-10-01 | 2025-05-21 | Eagle Industry Co., Ltd. | Sliding member |
| KR102661123B1 (ko) | 2018-10-24 | 2024-04-29 | 이구루코교 가부시기가이샤 | 슬라이딩 부재 |
| KR102589959B1 (ko) * | 2018-11-30 | 2023-10-17 | 이구루코교 가부시기가이샤 | 슬라이딩 부품 |
| JP7345998B2 (ja) | 2018-12-21 | 2023-09-19 | イーグル工業株式会社 | 摺動部品 |
| WO2020162025A1 (ja) | 2019-02-04 | 2020-08-13 | イーグル工業株式会社 | 摺動部品 |
| CN117432709A (zh) | 2019-02-14 | 2024-01-23 | 伊格尔工业股份有限公司 | 滑动部件 |
| EP3929454B1 (en) | 2019-02-21 | 2024-07-17 | Eagle Industry Co., Ltd. | Sliding components |
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Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2017002691A1 (ja) | 2018-04-12 |
| EP3315832A4 (en) | 2019-03-13 |
| CN107709852A (zh) | 2018-02-16 |
| EP3315832B1 (en) | 2020-01-15 |
| CN107709852B (zh) | 2020-05-12 |
| US10655736B2 (en) | 2020-05-19 |
| AU2016286781A1 (en) | 2018-01-18 |
| US20180187784A1 (en) | 2018-07-05 |
| EP3315832A1 (en) | 2018-05-02 |
| JP6616932B2 (ja) | 2019-12-04 |
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