WO2024075740A1 - シールリング - Google Patents
シールリング Download PDFInfo
- Publication number
- WO2024075740A1 WO2024075740A1 PCT/JP2023/036090 JP2023036090W WO2024075740A1 WO 2024075740 A1 WO2024075740 A1 WO 2024075740A1 JP 2023036090 W JP2023036090 W JP 2023036090W WO 2024075740 A1 WO2024075740 A1 WO 2024075740A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- seal ring
- recesses
- recess
- axis
- sliding
- 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
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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
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C19/00—Sealing arrangements in rotary-piston machines or engines
- F01C19/005—Structure and composition of sealing elements such as sealing strips, sealing rings and the like; Coating of these elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
- F04C27/008—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
Definitions
- the present invention relates to a seal ring.
- Annular seal rings have been used to close the gap between a fixed member and a movable member that faces the fixed member and moves relative to the fixed member.
- a seal ring is provided between the movable scroll and a thrust plate that supports the movable scroll to seal a low-pressure chamber that communicates with a compression chamber formed by the movable scroll and fixed scroll and prevent refrigerant leakage (see, for example, Patent Document 1).
- the seal ring contacts the movable scroll or thrust plate in the axial direction of the seal ring and slides against the movable scroll or thrust plate.
- the movable scroll rotates eccentrically.
- the seal ring also rotates eccentrically with the movable scroll, or rotates eccentrically relative to the movable scroll.
- the seal ring slides against the thrust plate or movable scroll based on the eccentric rotation of the movable scroll, providing resistance (sliding resistance) to the rotational driving force that rotates the movable scroll eccentrically.
- the contact portion of the seal ring wears with use.
- the contact portion of the seal ring deforms with use. This deformation can increase sliding resistance.
- the seal ring of a conventional scroll compressor is required to have a configuration in which sliding resistance does not increase even if the contact portion of the seal ring deforms over time.
- the seal ring of a conventional scroll compressor is required to have a configuration in which sliding resistance does not increase over time.
- the object of the present invention is to provide a seal ring that can suppress the increase in sliding resistance over time.
- the seal ring of the present invention is a seal ring for closing a gap between two members that move relative to each other, and is annular about an axis, and has one side which is an annular surface facing one side in the axial direction, and the other side which is an annular surface facing the other side in the axial direction, and at least one of the one side and the other side forms a gap between one or the other of the two members when it comes into contact with one or the other of the two members, and the gap is gradually reduced by wear of at least one of the one side and the other side due to contact with one of the two members.
- At least one of the one side surface and the other side surface has a plurality of portions that protrude toward the facing side.
- the multiple protruding portions are spaced apart around the axis.
- a seal ring when the one side surface comes into contact with one of the two members, the gap is formed between the one side surface and one of the two members, and when the other side surface comes into contact with the other of the two members, the gap is formed between the other side surface and the other of the two members.
- the one side surface has a plurality of one-side inner recesses that are recesses that are spaced apart from one another in the circumferential direction and open on the inner side, and also has a plurality of one-side outer recesses that are recesses that are spaced apart from one another in the circumferential direction and open on the outer side, each of the one-side inner recesses has a bottom surface that is a surface that expands in diameter as it approaches the one side in the axial direction, and each of the one-side outer recesses has a bottom surface that is a surface that contracts in diameter as it approaches the one side in the axial direction.
- each of the inner peripheral recesses on one side continuously expands in diameter as it moves toward the one side in the axial direction.
- each of the outer peripheral recesses on one side continuously reduces in diameter as it moves toward the one side in the axial direction.
- each of the inner peripheral recesses on one side intermittently expands in diameter as it moves toward the one side in the axial direction.
- each of the outer peripheral recesses on one side is discontinuously tapered in diameter as it moves toward the one side in the axial direction.
- each of the inner peripheral recesses on one side and each of the outer peripheral recesses on one side are radially opposed to each other.
- the other side has a plurality of other side inner recesses that are recesses that are spaced apart from one another in the circumferential direction and open on the inner side, and also has a plurality of other side outer recesses that are recesses that are spaced apart from one another in the circumferential direction and open on the outer side, each of the other side inner recesses having a bottom surface that is a surface that expands in diameter as it approaches the other side in the axial direction, and each of the other side outer recesses having a bottom surface that is a surface that contracts in diameter as it approaches the other side in the axial direction.
- each of the other-side inner circumferential recesses continuously expands in diameter as it moves toward the other side in the axial direction.
- each of the other-side outer peripheral recesses continuously reduces in diameter as it approaches the other side in the axial direction.
- each of the other-side inner circumferential recesses discontinuously expands in diameter as it moves toward the other side in the axial direction.
- each of the other-side outer peripheral recesses tapers discontinuously in diameter as it moves toward the other side in the axial direction.
- each of the inner circumferential recesses on the other side and each of the outer circumferential recesses on the other side are radially opposed to each other.
- the seal ring of the present invention can suppress the increase in sliding resistance over time.
- FIG. 1 is a front view of a seal ring according to a first embodiment of the present invention
- FIG. 2 is a side view of the seal ring shown in FIG. 2 is a cross-sectional perspective view showing a portion of the seal ring shown in FIG. 1
- 2 is a cross-sectional view of the seal ring taken along line AA in FIG. 1
- 2 is a cross-sectional view of the scroll compressor showing the seal ring shown in FIG. 1 in a used state attached to the scroll compressor to which the seal ring is applied.
- 6 is a diagram illustrating a schematic view of a relative movement of a seal ring with respect to a thrust plate during eccentric rotation of an eccentric portion of the scroll compressor illustrated in FIG. 5 .
- FIG. 5 is a schematic view of a relative movement of a seal ring with respect to a thrust plate during eccentric rotation of an eccentric portion of the scroll compressor illustrated in FIG. 5 .
- FIG. 6 is a side view of a seal ring according to a second embodiment of the present invention.
- 8 is a cross-sectional perspective view showing a portion of the seal ring shown in FIG. 7.
- 9 is a cross-sectional view of the seal ring taken along line BB in FIG. 8 .
- FIG. 10 is a plan view of a seal ring according to a third embodiment of the present invention.
- FIG. 11 is a cross-sectional perspective view showing a portion of the seal ring shown in FIG. 10 .
- 11 is a cross-sectional view of the seal ring taken along line CC in FIG. 10 .
- FIG. 11 is a cross-sectional perspective view showing a portion of a seal ring according to a third embodiment of the present invention.
- 14 is a cross-sectional view of the seal ring taken along line DD in FIG. 13.
- FIG. 1 is a plan view of a seal ring 1 according to a first embodiment of the present invention
- FIG. 2 is a side view of the seal ring 1
- FIG. 3 is a cross-sectional perspective view showing a part of the seal ring 1.
- the seal ring according to the present invention is a seal ring for closing a gap between two members that move relative to each other.
- the seal ring according to the present invention is used to close a gap between opposing surfaces that move relative to each other between two members that move relative to each other.
- the seal ring according to the present invention is provided between a movable scroll and a thrust plate that supports the movable scroll in a scroll compressor used in an automobile air conditioning system, for example, to seal a low-pressure chamber that communicates with a compression chamber formed by the movable scroll and the fixed scroll to prevent refrigerant leakage.
- the seal ring 1 according to the embodiment of the present invention is used in a scroll compressor. Note that the objects (applicable objects) to which the seal ring 1 according to the embodiment of the present invention is applied are not limited to those described above.
- the seal ring 1 is annular around the axis x, and has one side surface 1a, which is an annular surface facing one side in the direction of the axis x, and the other side surface 1b, which is an annular surface facing the other side in the direction of the axis x.
- a gap 1c is formed between the one or the other of these two components.
- the gap 1c is gradually reduced by wear of at least one of the one side surface 1a and the other side surface 1b due to contact with one of the movable scroll and thrust plate.
- the configuration of the seal ring 1 will be specifically described below.
- At least one of the one side surface 1a and the other side surface 1b has a plurality of convex portions 1d that protrude toward the side it faces.
- the plurality of convex portions 1d form a gap 1c between the one side surface 1a or the other side surface 1b and the movable scroll or thrust plate.
- the plurality of convex portions 1d are provided, for example, at intervals around the axis x. Specifically, for example, when the one side surface 1a comes into contact with one of the movable scroll and the thrust plate, a gap 1c is formed between the one side surface 1a and the movable scroll or the thrust plate.
- a gap 1c is formed between the one side surface 1a and the movable scroll or the thrust plate.
- a gap 1c may be formed between the one side surface 1a and the movable scroll or the thrust plate.
- a gap 1c may be formed between the movable scroll and the thrust plate.
- the seal ring 1 has a sliding surface 10 as one side surface 1a and a fixed surface 20 as the other side surface 1b.
- the sliding surface 10 has a plurality of inner recesses 30 as one-side inner recesses that are recesses that are formed spaced apart in the circumferential direction and open on the inner circumferential side, and also has a plurality of outer recesses 40 as one-side outer recesses that are recesses that are formed spaced apart in the circumferential direction and open on the outer circumferential side.
- Each of the inner recesses 30 has a bottom surface 31 that is a surface that expands in diameter as it moves toward one side in the direction of the axis x.
- Each of the outer recesses 40 has a bottom surface 41 that is a surface that contracts in diameter as it moves toward one side in the direction of the axis x.
- the side in the direction of arrow a in the direction of axis x will be referred to as the upper side (one side), and the side in the direction of arrow b (see FIG. 2) in the direction of axis x will be referred to as the lower side (the other side).
- the inner circumferential side is the side approaching the axis x (the direction of arrow c in FIG. 2) in the direction perpendicular to the axis x (hereinafter also referred to as the "radial direction")
- the outer circumferential side is the side moving away from the axis x in the radial direction (the direction of arrow d in FIG. 2).
- the seal ring 1 is made of a resin material. Specifically, as shown in Figures 1 to 3, the seal ring 1 has a rectangular or nearly rectangular cross section perpendicular to the extension direction of the seal ring 1, and has an inner peripheral surface 2 which is an annular surface facing the inner peripheral side, and an outer peripheral surface 3 which is an annular surface facing the outer peripheral side and is formed opposite to the inner peripheral surface 2.
- the inner peripheral surface 2 extends between the inner peripheral end of the sliding surface 10 and the inner peripheral end of the fixed surface 20, and the outer peripheral surface 3 extends between the outer peripheral end of the sliding surface 10 and the outer peripheral end of the fixed surface 20.
- An example of the resin material for the seal ring 1 is polyether ether ketone (PEEK).
- the sliding surface 10 is a surface formed as a sliding surface that is pressed against a thrust plate and slides on the thrust plate when the seal ring 1 is attached to a scroll compressor, which will be described later.
- the sliding surface 10 is an annular surface that spreads on a plane or approximately a plane perpendicular or approximately perpendicular to the axis x, and extends along a circular ring or approximately a circular ring centered or approximately centered on the axis x.
- the sliding surface 10 is formed with a plurality of inner recesses 30 and a plurality of outer recesses 40.
- the sliding surface 10 is recessed downward at the portions of the inner recesses 30 and the outer recesses 40, and a plurality of convex portions 1d are formed by the inner recesses 30 and the outer recesses 40.
- the inner recesses 30 are arranged side by side at intervals in the circumferential direction, for example, at equal or approximately equal angular intervals around the axis x.
- the outer recesses 40 are arranged side by side at intervals in the circumferential direction, for example, at equal or approximately equal angular intervals around the axis x.
- each of the inner recesses 30 and each of the outer recesses 40 are arranged back to back in the radial direction.
- the seal ring 1 is formed with a plurality of inner recesses 30 and a plurality of outer recesses 40, and the sliding surface 10 has an annular surface portion 11, a plurality of inner rib surface portions 12, and a plurality of outer rib surface portions 13, as shown in FIG. 1.
- the annular surface portion 11 is an annular surface portion of the sliding surface 10
- the inner rib surface portion 12 is a surface portion of the sliding surface 10 that extends from the annular surface portion 11 to the inner periphery
- the outer rib surface portion 13 is a surface portion of the sliding surface 10 that extends from the annular surface portion 11 to the outer periphery. Note that in the drawings, only some of the inner rib surface portions 12 and the outer rib surface portions 13 are labeled with reference numerals.
- the fixed surface 20 is the surface that is supported by and fixed to the movable scroll when the seal ring 1 is in use, as described below.
- the fixed surface 20 is an annular surface that extends on a plane or approximately a plane perpendicular or approximately perpendicular to the axis x, as shown in Figures 1 to 3, for example, and is a circular or approximately annular surface with the axis x as its center or approximately center.
- the inner peripheral surface 2 is, for example, a cylindrical surface or an approximately cylindrical surface with the axis x as its central axis or approximate central axis, as shown in Figs. 1 and 2
- the outer peripheral surface 3 is, for example, a cylindrical surface or an approximately cylindrical surface with the axis x as its central axis or approximate central axis, as shown in Figs. 1 and 2.
- each inner recess 30 extends circumferentially along an arc when viewed in the direction of the axis x, for example, extends circumferentially along a circular arc or an approximately circular arc.
- each inner recess 30 when viewed in the direction of the axis x, extends circumferentially in an arc shape along an arc of central angle ⁇ 1 within a range of central angle ⁇ 1 (range between dotted lines R) centered on the axis x.
- the radial width (width r1) of each inner recess 30 is, for example, constant or approximately constant throughout the extension direction (circumferential direction) of the inner recess 30.
- each outer recess 40 extends circumferentially along an arc when viewed in the direction of the axis x, for example, extending circumferentially along a circular arc or an approximately circular arc.
- each outer recess 40 has a shape similar or approximately similar to each inner recess 30 when viewed in the direction of the axis x on the outer circumferential side of each inner recess 30. In the illustrated example, as shown in FIG.
- the radial width (width r2) of each outer recess 40 is, for example, constant or approximately constant over the extension direction (circumferential direction) of the outer recess 40.
- the width r1 of each inner recess 30 is, for example, the same or approximately the same as the width r2 of each outer recess 40.
- the inner recess 30 and the outer recess 40 are back-to-back with each other.
- the inner recess 30 and the outer recess 40 do not have to be back-to-back with each other.
- the range of central angle ⁇ 1 in which the inner recess 30 extends range between two radial lines of central angle ⁇ 1 (see dotted lines R in FIG. 1)
- the range of central angle ⁇ 2 in which the outer recess 40 extends range between two radial lines of central angle ⁇ 2 (see dotted lines R in FIG.
- FIG. 4 is a cross-sectional view of the seal ring 1 taken along line A-A in FIG. 1. That is, FIG. 4 is a cross-sectional view of the seal ring 1 taken along a cross section perpendicular to the circumferential extension direction of the seal ring 1. As shown in FIG. 1, the bottom surface 31 of each inner recess 30 expands within a range of a central angle ⁇ 1 (range between dotted lines R) when viewed in the direction of the axis x. As shown in FIG.
- each inner recess 30 expands in diameter from the bottom to the top in the direction of the axis x, and the distance (diameter D1) from the axis x increases as it moves upward in the direction of the axis x.
- the bottom surface 31 of each inner recess 30 continuously expands in diameter, for example, as it moves upward in the direction of the axis x.
- the bottom surface 31 in a cross section perpendicular to the extension direction of the seal ring 1, the bottom surface 31 outlines a straight line or an approximately straight line inclined downward at an inclination angle ⁇ 1 with respect to the annular surface portion 11 of the sliding surface 10.
- each inner recess 30 is a flat surface or a substantially flat surface that is inclined downward with respect to the annular surface portion 11 of the sliding surface 10, as shown in, for example, Figures 3 and 4.
- the value of the inclination angle ⁇ 1 of the bottom surface 31 is, for example, 0.3° to 2°.
- each inner recess 30 is connected to the inner peripheral surface 2 at its inner end (inner peripheral end 31a), and the inner peripheral end 31a of the bottom surface 31 of each inner recess 30 is located lower in the axis x direction than the inner rib surface portion 12 of the sliding surface 10. In this way, each inner recess 30 forms an opening 32 in the inner peripheral surface 2. Also, as shown in Figures 3 and 4, the bottom surface 31 of each inner recess 30 is smoothly connected to the annular surface portion 11 of the sliding surface 10 at its outer peripheral end (outer peripheral end 31b).
- each inner recess 30 has side surfaces 33 and 34 that extend below the two opposing circumferential ends (ends 12a and 12b) of the two opposing inner rib surface portions 12 in the circumferential direction.
- the side surfaces 33 and 34 are flat or approximately flat surfaces that extend parallel or approximately parallel to a plane including the axis x, and are wedge-shaped or approximately wedge-shaped surfaces.
- the side surfaces 33 and 34 have the same or approximately the same shape and size.
- the side surfaces 33 and 34 do not have to be flat, and may be, for example, curved surfaces or surfaces that combine curved surfaces and flat surfaces.
- the shape of the side surfaces 33 and 34 is not limited to a wedge shape, and may be other shapes according to the shape of the bottom surface 31.
- the side surfaces 33 and 34 may be along a surface that is inclined toward a plane including the axis x.
- the bottom surface 31 is not limited to an inclined plane as described above, but may be, for example, a curved surface or a surface that is a combination of a curved surface and a plane. Specifically, for example, the bottom surface 31 may be a surface that, in cross section, describes an arc such as a circular arc that is convex upward, or the bottom surface 31 may be a surface that, in cross section, describes an arc such as a circular arc that is convex downward.
- each outer recess 40 spreads over a range of a central angle ⁇ 2 (range between dotted lines R) when viewed in the direction of the axis x.
- the bottom surface 41 of each outer recess 40 is tapered from the bottom to the top in the direction of the axis x, and the distance (diameter D2) from the axis x becomes smaller as it moves upward in the direction of the axis x.
- the bottom surface 41 of each outer recess 40 is tapered continuously, for example, as it moves upward in the direction of the axis x. Specifically, for example, as shown in FIG.
- the bottom surface 41 draws a straight or approximately straight outline inclined downward at an inclination angle ⁇ 2 with respect to the annular surface portion 11 of the sliding surface 10.
- the bottom surface 41 of each outer recess 40 is a flat surface or approximately flat surface inclined downward with respect to the annular surface portion 11 of the sliding surface 10, for example, as shown in FIGS. 3 and 4.
- the inclination angle ⁇ 1 of the bottom surface 31 of each inner recess 30 and the inclination angle ⁇ 2 of the bottom surface 41 of each outer recess 40 are the same angle or approximately the same angle.
- the value of the inclination angle ⁇ 2 of the bottom surface 41 is, for example, 0.3° to 2°.
- the inclination angle ⁇ 1 of the bottom surface 31 of each inner recess 30 and the inclination angle ⁇ 2 of the bottom surface 41 of each outer recess 40 may be different angles.
- each outer recess 40 is connected to the outer peripheral surface 3 at its outer peripheral end (outer peripheral end 41a), and the outer peripheral end 41a of the bottom surface 41 of each outer recess 40 is located lower in the axis x direction than the outer rib surface portion 13 of the sliding surface 10. In this way, each outer recess 40 forms an opening 42 in the outer peripheral surface 3. Also, as shown in Figures 3 and 4, the bottom surface 41 of each outer recess 40 is smoothly connected to the annular surface portion 11 of the sliding surface 10 at its inner peripheral end (inner peripheral end 41b).
- each outer recess 40 has side surfaces 43 and 44 that extend below the two opposing circumferential ends (ends 13a and 13b) of the two opposing outer rib surfaces 13.
- the side surfaces 43 and 44 are flat or approximately flat surfaces that extend parallel or approximately parallel to a plane including the axis x, and are wedge-shaped or approximately wedge-shaped surfaces.
- the side surfaces 43 and 44 have the same or approximately the same shape and size.
- the side surfaces 43 and 44 do not have to be flat, and may be, for example, curved surfaces or surfaces that combine curved surfaces and flat surfaces.
- the shape of the side surfaces 43 and 44 is not limited to a wedge shape, and may be other shapes according to the shape of the bottom surface 41.
- the side surfaces 43 and 44 may be along a surface that is inclined toward a plane including the axis x.
- the bottom surface 41 is not limited to an inclined plane as described above, but may be, for example, a curved surface or a surface that is a combination of a curved surface and a plane. Specifically, for example, the bottom surface 41 may be a surface that, in cross section, describes an arc such as a circular arc that is convex upward, or the bottom surface 41 may be a surface that, in cross section, describes an arc such as a circular arc that is convex downward.
- each inner recess 30 forms a recess on the inner circumference side of the sliding surface 10, in which the area in a cross section perpendicular to the radial direction or the area in a cross section of a cylindrical surface with the axis x as the central axis gradually decreases from the opening 32 on the inner circumference side toward the outer peripheral end 31b on the outer circumference side.
- each outer recess 40 forms a recess on the outer circumference side of the sliding surface 10, in which the area in a cross section perpendicular to the radial direction or the area in a cross section of a cylindrical surface with the axis x as the central axis gradually decreases from the opening 42 on the outer circumference side toward the inner inner peripheral end 41b on the inside.
- Figure 5 is a cross-sectional view of the scroll compressor 100, to which the seal ring 1 is applied, showing the seal ring 1 in use when attached to the scroll compressor 100.
- the scroll compressor 100 is used, for example, in an automobile air conditioning system, and sucks in, compresses, and discharges a refrigerant.
- the refrigerant is, for example, a gas mixed with mist-like lubricating oil.
- the scroll compressor 100 has a housing 101, a rotating shaft 102, an inner casing 103, a scroll compression mechanism 104, a thrust plate 105, and a drive motor 106.
- the housing 101 has a cylindrical casing 107 and a cover 108 that closes the upper opening of the casing 107.
- a low pressure chamber 110 to which low pressure refrigerant is supplied from a refrigerant circuit (not shown) through an intake port 109
- a high pressure chamber 111 from which high pressure refrigerant compressed by the scroll compression mechanism 104 is discharged
- a back pressure chamber 112 to which a portion of the refrigerant compressed by the scroll compression mechanism 104 is supplied together with lubricating oil.
- the back pressure chamber 112 is formed inside a cylindrical inner casing 103 housed inside the casing 107.
- the cover 108 is formed with a discharge communication passage 113 that communicates between the refrigerant circuit (not shown) and the high pressure chamber 111.
- a part of a back pressure communication passage 114 that connects the high pressure chamber 111 and the back pressure chamber 112 is formed in the cover 108 by branching off from the discharge communication passage 113.
- the discharge communication passage 113 is provided with an oil separator 115 that separates the lubricating oil from the refrigerant.
- the inner casing 103 is fixed with its upper end in contact with the end plate 121 of the fixed scroll 120 that constitutes the scroll compression mechanism 104.
- a suction communication passage 116 that penetrates radially is formed at the upper end of the inner casing 103. Therefore, the low pressure chamber 110 is formed from the outside of the inner casing 103 to the inside of the inner casing 103 via the suction communication passage 116. The refrigerant supplied to the inside of the inner casing 103 through the suction communication passage 116 is sucked into the scroll compression mechanism 104.
- the scroll compression mechanism 104 has a fixed scroll 120 fixed to the cover 108, and a movable scroll 125 housed inside the inner casing 103.
- the fixed scroll 120 is made of metal, and has a spiral wrap 122 protruding from the lower surface of a disk-shaped end plate 121.
- the fixed scroll 120 also has a recess 123 formed on the upper surface of the end plate 121 that is recessed downward, and this recess 123 and the lower surface of the cover 108 form a high-pressure chamber 111.
- the movable scroll 125 is made of metal and has a spiral wrap 127 that protrudes from the upper surface of a disk-shaped end plate 126.
- the movable scroll 125 also has a boss 128 that protrudes from a position away from the center of the lower surface (lower surface 126a) of the end plate 126.
- the boss 128 accommodates an eccentric portion 102a formed on the upper end of the rotating shaft 102 so that it can rotate relatively.
- the eccentric portion 102a of the rotating shaft 102 and the counterweight portion 102b that protrudes from the upper end of the rotating shaft 102 in the outer circumferential direction form an eccentric mechanism that rotates the rotating shaft 102 eccentrically.
- the seal ring 1 is fixed to the lower surface 126a of the end plate 126 of the movable scroll 125. Specifically, the portion of the seal ring 1 on the fixed surface 20 side is fixed to the lower surface 126a of the end plate 126 of the movable scroll 125 so that the sliding surface 10 of the seal ring 1 faces downward and is located lower than the lower surface 126a of the movable scroll 125.
- the thrust plate 105 is an annular metal member.
- a conventionally known seal ring 117 is fixed to the lower surface (lower surface 105a) of the thrust plate 105.
- the thrust plate 105 is provided below the movable scroll 125.
- the seal ring 117 contacts the inner peripheral surface of the inner casing 103, and the thrust plate 105 is fixed to the inner casing 103 via the seal ring 117.
- the upper surface (upper surface 105b) of the thrust plate 105 contacts the sliding surface 10 of the seal ring 1.
- the thrust plate 105 functions as a thrust bearing that receives the thrust load of the movable scroll 125 in the axis x1 direction via the seal ring 1.
- the axis x1 is the axis of the movable scroll 125, and the axis x1 of the movable scroll 125 coincides or approximately coincides with the axis x of the seal ring 1.
- a through hole 105c is formed in the thrust plate 105, and the boss 128 of the movable scroll 125 passes through this through hole 105c.
- the through hole 105c is formed with a diameter large enough to allow eccentric rotation of the boss 128 by the eccentric part 102a of the rotating shaft 102 inserted into the boss 128.
- the movable scroll 125 rotates eccentrically about the axis x2 of the rotating shaft 102 due to the eccentric rotation of the eccentric part 102a of the rotating shaft 102, and the sliding surface 10 of the seal ring 1 slides relative to the upper surface 105b of the thrust plate 105 with eccentric rotation.
- the seal ring 1 and the seal ring 117 divide the low pressure chamber 110 formed on the outer periphery of the movable scroll 125 and the back pressure chamber 112 formed below the movable scroll 125 inside the inner casing 103.
- the back pressure chamber 112 is formed as a sealed space by a conventionally known seal ring 118 that closes the annular space between the through hole 103a through which the rotating shaft 102 passes and the rotating shaft 102 formed in the inner casing 103.
- a back pressure communication passage 114 that is formed across the cover 108, the fixed scroll 120, and the inner casing 103 and communicates the high pressure chamber 111 and the back pressure chamber 112 is provided with an orifice (not shown), and the refrigerant in the high pressure chamber 111, which has been reduced in pressure by the orifice, is supplied to the back pressure chamber 112 together with the lubricating oil separated by the oil separator 115.
- the pressure in the back pressure chamber 112 is adjusted to be higher than the pressure in the low pressure chamber 110.
- the inner casing 103 is formed with a pressure relief hole 119a that penetrates radially and connects the low pressure chamber 110 and the back pressure chamber 112, and a pressure adjustment valve 119b is provided in the pressure relief hole 119a.
- the pressure adjustment valve 119b opens when the pressure in the back pressure chamber 112 exceeds a set value.
- a compression chamber 104a is formed between the wrap 122 of the fixed scroll 120 and the wrap 127 of the movable scroll 125, and the compression chamber 104a is connected to the high-pressure chamber 111 via a discharge hole 124, which is a hole that penetrates the end plate 121 of the fixed scroll 120.
- the eccentric portion 102a rotates eccentrically, and the movable scroll 125 moves eccentrically relative to the fixed scroll 120.
- the radial contact position of the wraps 122, 127 moves sequentially in the rotational direction, and the compression chamber 104a formed between the wraps 122, 127 gradually shrinks as it moves toward the center.
- the refrigerant sucked from the low pressure chamber 110 into the compression chamber 104a of the scroll compression mechanism 104 is compressed, and high pressure refrigerant is discharged into the high pressure chamber 111 through the discharge hole 124 of the fixed scroll 120.
- the movable scroll 125 rotates eccentrically together with the seal ring 1.
- the axis x of the seal ring 1 rotates around the axis x2 of the rotating shaft 102 and describes a circle. Due to this eccentric rotation of the movable scroll 125, the sliding surface 10 of the seal ring 1 slides in a circular motion on the upper surface 105b of the thrust plate 105.
- Figure 6 is a diagram that shows a schematic diagram of the relative movement of the seal ring 1 with respect to the thrust plate 105 during the eccentric rotation of the eccentric portion 102a.
- the annular area (sliding area S) centered on the axis x2 of the rotating shaft 102, indicated by dots in FIG. 6, is the area where the sliding surface 10 of the seal ring 1 slides on the upper surface 105b of the thrust plate 105 during eccentric rotation of the eccentric part 102a.
- the seal ring 1 has multiple internal recesses 30 on the sliding surface 10, forming multiple gaps 1c between the upper surface 105b of the thrust plate 105 and the sliding surface 10.
- the pressure of the refrigerant (fluid) containing lubricating oil in each internal recess 30 is increased, thereby maintaining or strengthening the fluid film between the upper surface 105b of the thrust plate 105 and the sliding surface 10 of the seal ring 1.
- each internal recess 30 opens into the back pressure chamber 112 at an opening 32, and the fluid in the back pressure chamber 112 enters the internal recess 30 from the opening 32.
- each inner recess 30 when the fluid flows toward the outer circumferential end 31b of each inner recess 30 or toward the side surface 33 or side surface 34 of the inner rib surface portion 12 that faces the rotational direction of the thrust plate 105 due to the relative movement of the bottom surface 31 with respect to the upper surface 105b of the thrust plate 105 or the pressure in the back pressure chamber 112, the fluid hits the outer circumferential end 31b or the side surface 33 or side surface 34 of the inner rib surface portion 12, and the pressure in the part of the fluid close to the outer circumferential end 31b or the side surface 33 or side surface 34 of the inner rib surface portion 12 increases. This type of dynamic pressure action is induced in each inner recess 30.
- each inner recess 30 pressurizes the fluid film formed in the gap between the annular surface portion 11, the inner rib surface portion 12, and the outer rib surface portion 13 of the sliding surface 10 and the upper surface 105b of the thrust plate 105, making it easier to maintain the thickness of the fluid film formed in the gap between the annular surface portion 11, the inner rib surface portion 12, and the outer rib surface portion 13 of the sliding surface 10 and the upper surface 105b of the thrust plate 105.
- each inner recess 30 the fluid flows toward the outer peripheral end 31b.
- the fluid flows toward the outer peripheral end 31b, the fluid is pushed from the inner peripheral end 31a toward the outer peripheral end 31b.
- the bottom surface 31 of each inner recess 30 is a plane or approximately flat surface that continuously expands in diameter as it moves upward and inclines toward the upper surface 105b of the thrust plate 105 from the inner peripheral side to the outer peripheral side, and the cross-sectional area of each inner recess 30 approximately parallel to a plane perpendicular to the radial direction becomes smaller from the inner peripheral side to the outer peripheral side.
- each inner recess 30 the pressure of the fluid pushed toward the outer peripheral end 31b increases from the opening 32 side toward the outer peripheral part 31b, and the pressure of the part of the fluid close to the outer peripheral end 31b becomes high.
- the high pressure fluid generated in each internal recess 30 as described above mainly pressurizes the fluid film formed in the gap between the annular surface portion 11 of the sliding surface 10 and the upper surface 105b of the thrust plate 105, and the pressure of the fluid film formed in the gap between the annular surface portion 11 of the sliding surface 10 and the upper surface 105b of the thrust plate 105 increases.
- the pressure of the fluid film formed in the gap between the annular surface portion 11 of the sliding surface 10 and the upper surface 105b of the thrust plate 105 increases, the height of the gap between the annular surface portion 11 of the sliding surface 10 and the upper surface 105b of the thrust plate 105 increases, and the fluid flows into the increased gap, increasing the amount of fluid in the gap between the annular surface portion 11 of the sliding surface 10 and the upper surface 105b of the thrust plate 105, and increasing the thickness of the fluid film.
- the side surface 33 or side surface 34 of the inner rib surface portion 12 rises from the bottom surface 31 of each inner recess 30 in a direction along the axis x direction, away from the bottom surface 31.
- the side surface 33 or side surface 34 is flat or approximately flat.
- the fluid flows toward the side surface 33 or side surface 34 of the inner rib surface portion 12, which faces the rotation direction of the thrust plate 105, in each inner recess 30, the fluid hits the side surface 33 or side surface 34 of the inner rib surface portion 12, and the pressure of the part of the fluid close to the side surface 33 or side surface 34 of the inner rib surface portion 12 increases.
- This high-pressure fluid generated in each inner recess 30 mainly pressurizes the fluid film formed in the gap between the inner rib surface portion 12 of the sliding surface 10 and the upper surface 105b of the thrust plate 105, and the pressure of the fluid film formed in the gap between the inner rib surface portion 12 of the sliding surface 10 and the upper surface 105b of the thrust plate 105 increases.
- the seal ring 1 has multiple outer recesses 40 on the sliding surface 10, forming multiple gaps 1c between the upper surface 105b of the thrust plate 105 and the sliding surface 10.
- the pressure of the refrigerant (fluid) containing lubricating oil in each outer recess 40 is increased, thereby maintaining or strengthening the fluid film between the upper surface 105b of the thrust plate 105 and the sliding surface 10 of the seal ring 1.
- each outer recess 40 opens into the low pressure chamber 110 at an opening 42, and the fluid in the low pressure chamber 110 enters the outer recess 40 from the opening 42.
- each outer recess 40 when the fluid flows toward the inner circumferential end 41b of each outer recess 40 or toward the side surface 43 or side surface 44 of the outer rib surface portion 13 that faces the rotational direction of the thrust plate 105 due to the relative movement of the bottom surface 41 with respect to the upper surface 105b of the thrust plate 105 or the pressure within the low pressure chamber 110, the fluid hits the inner circumferential end 41b or the side surface 43 or side surface 44 of the outer rib surface portion 13, and the pressure in the part of the fluid close to the inner circumferential end 41b or the side surface 43 or side surface 44 of the outer rib surface portion 13 increases. In each inner recess 40, such a dynamic pressure action is induced.
- each outer recess 40 pressurizes the fluid film formed in the gap between the annular surface portion 11, the inner rib surface portion 12, and the outer rib surface portion 13 of the sliding surface 10 and the upper surface 105b of the thrust plate 105, making it easier to maintain the thickness of the fluid film formed in the gap between the annular surface portion 11, the inner rib surface portion 12, and the outer rib surface portion 13 of the sliding surface 10 and the upper surface 105b of the thrust plate 105.
- each inner recess 40 the fluid flows toward the inner circumferential end 41b.
- the fluid flows toward the inner circumferential end 41b, the fluid is pushed from the outer circumferential end 41a toward the inner circumferential end 41b.
- the bottom surface 41 of each outer recess 40 is a plane or approximately flat surface that continuously reduces in diameter as it moves upward and inclines toward the upper surface 105b of the thrust plate 105 from the outer circumferential side toward the inner circumferential side, and the cross-sectional area of each outer recess 40 approximately parallel to a plane perpendicular to the radial direction decreases from the outer circumferential side toward the inner circumferential side.
- each outer recess 40 the pressure of the fluid pushed toward the inner circumferential end 41b increases from the opening 42 side toward the inner circumferential part 41b, and the pressure of the part of the fluid close to the inner circumferential end 41b increases.
- the high pressure fluid generated in each outer recess 40 as described above mainly pressurizes the fluid film formed in the gap between the annular surface portion 11 of the sliding surface 10 and the upper surface 105b of the thrust plate 105, and the pressure of the fluid film formed in the gap between the annular surface portion 11 of the sliding surface 10 and the upper surface 105b of the thrust plate 105 increases.
- the pressure of the fluid film formed in the gap between the annular surface portion 11 of the sliding surface 10 and the upper surface 105b of the thrust plate 105 increases, the height of the gap between the annular surface portion 11 of the sliding surface 10 and the upper surface 105b of the thrust plate 105 increases, and the fluid flows into the increased gap, increasing the amount of fluid in the gap between the annular surface portion 11 of the sliding surface 10 and the upper surface 105b of the thrust plate 105, and increasing the thickness of the fluid film.
- the side surface 43 or side surface 44 of the outer rib surface portion 13 rises from the bottom surface 41 of each outer recess 40 in a direction along the axis x direction, away from the bottom surface 41.
- the side surface 43 or side surface 44 is flat or approximately flat.
- the fluid hits the side surface 43 or side surface 44 of the outer rib surface portion 13, and the pressure of the part of the fluid close to the side surface 43 or side surface 44 of the outer rib surface portion 13 increases.
- This high-pressure fluid generated in each outer recess 40 mainly pressurizes the fluid film formed in the gap between the outer rib surface portion 13 of the sliding surface 10 and the upper surface 105b of the thrust plate 105, and the pressure of the fluid film formed in the gap between the outer rib surface portion 13 of the sliding surface 10 and the upper surface 105b of the thrust plate 105 increases.
- the effect of the dynamic pressure action generated in each inner recess 30 and each outer recess 40 maintains or strengthens (increases) the overall thickness of the fluid film between the sliding surface 10 of the seal ring 1 and the upper surface 105b of the thrust plate 105.
- This suppresses microscopic, partial, direct contact between the sliding surface 10 and the upper surface 105b without the lubricating oil film.
- it is possible to suppress or improve the decrease in lubricity between the sliding surface 10 and the upper surface 105b.
- the sliding resistance of the seal ring 1 is reduced, the frictional resistance against the movable scroll 125 is reduced, and the driving torque of the drive motor 106 can be reduced.
- the fluid film formed in the gap between the annular surface portion 11, the inner rib surface portion 12, and the outer rib surface portion 13 of the sliding surface 10 and the upper surface 105b of the thrust plate 105 is pressurized from both the inner recess 30 side and the outer recess 40 side, so that the gap between the annular surface portion 11, the inner rib surface portion 12, and the outer rib surface portion 13 of the sliding surface 10 and the upper surface 105b of the thrust plate 105 can be further increased, and more fluid flows into the increased gap, so that the thickness of the fluid film in the gap between the annular surface portion 11, the inner rib surface portion 12, and the outer rib surface portion 13 of the sliding surface 10 and the upper surface 105b of the thrust plate 105 can be further increased.
- the lubrication between the sliding surface 10 and the upper surface 105b can be further improved, the sliding resistance of the seal ring 1 can be further reduced, the frictional resistance against the movable scroll 125 can be further reduced, and the driving torque of the drive motor 106 can be further reduced.
- each inner recess 30 and each outer recess 40 are radially opposed to each other and lined up in the radial direction. Therefore, a pair of inner recesses 30 and outer recesses 40 lined up in the radial direction can efficiently provide the dynamic pressure action and the effect of the dynamic pressure action between the sliding surface 10 of the seal ring 1 and the upper surface 105b of the thrust plate 105.
- a thrust load is applied to the seal ring 1 against the thrust plate 105, and the sliding surface 10 of the seal ring 1 is worn due to the sliding of the seal ring 1 against the thrust plate 105.
- the seal ring 1 is made of a resin material, the sliding surface 10 of the seal ring 1 may be easily worn due to the sliding of the seal ring 1 against the thrust plate 105. If the dynamic pressure action of the inner recess 30 and the outer recess 40 is reduced or eliminated due to this wear, the above-mentioned lubricating performance of the seal ring 1 and the effect of reducing the sliding resistance of the seal ring 1 cannot be obtained.
- each inner recess 30 is a plane or approximately flat surface that slopes downward from the annular surface portion 11 toward the inner circumference and that continuously expands in diameter from the bottom to the top in the axial x direction.
- the bottom surface 41 of each outer recess 40 is a plane or approximately flat surface that slopes downward from the annular surface portion 11 toward the outer circumference and that continuously reduces in diameter from the bottom to the top in the axial x direction.
- the seal ring 1 can maintain high lubricity between the sliding surface 10 and the upper surface 105a based on the dynamic pressure action of each of the inner recesses 30 and each of the outer recesses 40, and can maintain low sliding resistance of the seal ring 1, can maintain low friction resistance of the seal ring 1 against the movable scroll 125, and can maintain low driving torque of the drive motor 106.
- the seal ring 1 according to the first embodiment of the present invention can suppress the increase over time in the sliding resistance of the seal ring 1 against the thrust plate 105.
- Fig. 7 is a side view of the seal ring 4 according to the second embodiment of the present invention
- Fig. 8 is a cross-sectional perspective view showing a portion of the seal ring 4
- Fig. 9 is a cross-sectional view of the seal ring 4 taken along line B-B in Fig. 8.
- Fig. 9 is a cross-sectional view of a section corresponding to the cross-section of the seal ring 1 shown in Fig. 4 above.
- the seal ring 4 according to the second embodiment of the present invention differs from the seal ring 1 described above in that it has a sliding surface 10 instead of a fixed surface 20 as the other side surface 1b. That is, the seal ring 4 has a pair of sliding surfaces 10 facing each other in the direction of the axis x.
- the upper sliding surface 10 and the lower sliding surface 10 are symmetrical in the direction of the axis x.
- the upper sliding surface 10 and the lower sliding surface 10 do not have to be symmetrical in the direction of the axis x.
- the upper inner recesses 30 and the lower inner recesses 30 may have different shapes and sizes, and do not have to be located at corresponding positions in the direction of the axis x.
- the upper outer recesses 40 and the lower outer recesses 40 may have different shapes and sizes, and do not have to be located at corresponding positions in the direction of the axis x.
- both of the two surfaces facing away from each other in the direction of the axis x are sliding surfaces 10, so there is no need to check the orientation of the seal ring 4 when attaching it to the scroll compressor 100, making it easy to attach the seal ring 4.
- the seal ring 4 acts in the same manner as the above-mentioned seal ring 1 when in use, and can exert the same dynamic pressure action and dynamic pressure action effects as the seal ring 1, and can maintain the dynamic pressure action even if friction of the sliding surfaces 10 progresses.
- the seal ring 4 according to the second embodiment of the present invention can suppress the increase over time in the sliding resistance of the seal ring 1 against the thrust plate 105.
- the seal ring 5 according to the third embodiment of the present invention differs from the above-mentioned seal ring 1 mainly in the shape of the bottom surface of each inner recess and in the shape of the bottom surface of each outer recess.
- the same reference numerals are used to designate the same configuration as seal ring 1 or configurations having similar functions, and their description is omitted, and only the configurations that differ from seal ring 1 will be described.
- FIGS. 10 to 12 are plan views of a seal ring 5 according to a third embodiment of the present invention
- FIG. 11 is a cross-sectional perspective view showing a portion of the seal ring 5
- FIG. 12 is a cross-sectional view of the seal ring 5 taken along line C-C in FIG. 10.
- the seal ring 5 has a sliding surface 15 that is different from the sliding surface 10 of the seal ring 1.
- the sliding surface 15 of the seal ring 5 has a plurality of inner recesses 35 and a plurality of outer recesses 45, which are respectively provided in the same manner as the plurality of inner recesses 30 and the plurality of outer recesses 40 on the sliding surface 10 of the seal ring 1.
- the sliding surface 15 has an annular surface portion 11, an inner rib surface portion 12, and an outer rib surface portion 13, similar to the sliding surface 10.
- the inner recess 35 of the seal ring 5 has a bottom surface 36 with a different shape than the bottom surface 31 of the inner recess 30 of the seal ring 1.
- the outer recess 45 of the seal ring 5 has a bottom surface 46 with a different shape than the bottom surface 41 of the outer recess 40 of the seal ring 1.
- each inner recess 35 increases in diameter from the bottom to the top in the axial x direction, and the distance from the axis x (diameter D3) increases as it moves upward in the axial x direction.
- the bottom surface 36 of each inner recess 35 increases in diameter, for example, discontinuously as it moves upward in the axial x direction.
- the bottom surface 36 is a stepped surface having steps 37, 38, and 39.
- the inclination angle formed by the bottom surface 36 is, for example, the same as the inclination angle ⁇ 1 of the bottom surface 31 of the inner recess 30 described above.
- the inclination angle formed by the bottom surface 36 may be different from the inclination angle ⁇ 1 of the bottom surface 31.
- the step 37 has a surface portion 37a and a step portion 37b.
- the surface 37a is a surface that extends in an arc shape within the range of the central angle ⁇ 1 (range between dotted lines R) centered on the axis x, for example, an arc-shaped surface that extends along the arc that extends within the range of the central angle ⁇ 1, and a surface that extends parallel or approximately parallel to a plane perpendicular to the axis x.
- the step portion 37b is a cross-sectionally arc-shaped surface that extends upward from the end on the outer periphery side of the surface portion 37a, for example, a cross-sectionally arc-shaped surface that extends along the arc that extends within the range of the central angle ⁇ 1, and a surface that extends parallel or approximately parallel to a cylindrical surface or approximately cylindrical surface with the axis x as the central axis or approximately the central axis.
- the surface portion 37a and the step portion 37b may be smoothly connected, or may not be smoothly connected by a right angle or the like.
- the step 38 has a surface portion 38a and a step portion 38b, similar to the step 37.
- the surface portion 38a extends from the upper end of the step portion 37b toward the outer periphery, and is, for example, a surface similar or approximately similar to the surface portion 37a.
- the step portion 38b extends upward from the outer periphery end of the surface portion 38a, and is, for example, a surface similar or approximately similar to the step portion 37b.
- the surface portion 38a and the step portion 37b may be smoothly connected, or may not be smoothly connected by orthogonal or the like.
- the surface portion 38a and the step portion 38b may be smoothly connected, or may not be smoothly connected by orthogonal or the like.
- the step 39 has a surface portion 39a and a step portion 39b, similar to the step 38.
- the surface portion 39a extends from the upper end of the step portion 38b toward the outer periphery, and is, for example, a surface similar or approximately similar to the surface portion 38a.
- Step portion 39b extends upward from the outer peripheral end of surface portion 39a, and is, for example, a surface similar or approximately similar to step portion 38b.
- Step portion 39b is connected to annular surface portion 11 of sliding surface 10.
- Surface portion 39a and step portion 38b may be smoothly connected, or may not be smoothly connected at right angles, etc.
- Surface portion 39a and step portion 39b may be smoothly connected, or may not be smoothly connected at right angles, etc.
- Step portion 39b and annular surface portion 11 may be smoothly connected, or may not be smoothly connected at right angles, etc.
- each inner recess 35 forms an opening 32 in the inner peripheral surface 2, similar to the inner recess 30 described above.
- the surface portions 37a, 38a, and 39a of the steps 37, 38, and 39 are not limited to surfaces parallel to a plane perpendicular to the axis x.
- the surface portions 37a, 38a, and 39a may be, for example, flat or approximately flat surfaces inclined upward from the inner periphery to the outer periphery with respect to the plane perpendicular to the axis x, and may not be flat surfaces, and may be surfaces of other shapes.
- the step portions 37b, 38b, and 39b of the steps 37, 38, and 39 are not limited to surfaces parallel to a cylindrical surface.
- the step portions 37b, 38b, and 39b may be, for example, surfaces parallel or approximately parallel to a conical surface that expands in diameter toward the upper side, and may be surfaces of other shapes.
- the bottom surface 36 has three steps (steps 37, 38, and 39), but the number of steps on the bottom surface 36 is not limited to three, and may be one or two, or four or more.
- each outer recess 45 is tapered from the bottom to the top in the axial x direction, and the distance (diameter D4) from the axis x increases as it moves upward in the axial x direction.
- the bottom surface 46 of each outer recess 45 is tapered intermittently, for example, as it moves upward in the axial x direction.
- the bottom surface 46 is a stepped surface having steps 47, 48, and 49.
- the inclination angle formed by the bottom surface 46 is, for example, the same as the inclination angle ⁇ 2 of the bottom surface 41 of the outer recess 40 described above.
- the inclination angle formed by the bottom surface 46 may be different from the inclination angle ⁇ 2 of the bottom surface 41.
- the step 47 has a surface portion 47a and a step portion 47b.
- the surface 47a is a surface that extends in an arc shape within the range of the central angle ⁇ 2 (range between dotted lines R) centered on the axis x, and is, for example, an arc-shaped surface that extends along the arc that extends within the range of the central angle ⁇ 2, and is a surface that extends parallel or approximately parallel to a plane perpendicular to the axis x.
- the step portion 47b is a cross-sectionally arc-shaped surface that extends upward from the end on the outer periphery side of the surface 47a, and is, for example, a cross-sectionally arc-shaped surface that extends along the arc that extends within the range of the central angle ⁇ 2, and is a surface that extends parallel or approximately parallel to a cylindrical surface or approximately cylindrical surface with the axis x as the central axis or approximately the central axis.
- the surface portion 47a and the step portion 47b may be smoothly connected, or may not be smoothly connected by a right angle or the like.
- the step 48 has a surface portion 48a and a step portion 48b, similar to the step 47.
- the surface portion 48a extends from the upper end of the step portion 47b toward the inner circumference, and is, for example, a surface similar or approximately similar to the surface portion 47a.
- the step portion 48b extends from the inner circumference end of the surface portion 48a toward the upper side, and is, for example, a surface similar or approximately similar to the step portion 47b.
- the surface portion 48a and the step portion 47b may be smoothly connected, or may not be smoothly connected by orthogonal or the like.
- the surface portion 48a and the step portion 48b may be smoothly connected, or may not be smoothly connected by orthogonal or the like.
- the step 49 has a surface portion 49a and a step portion 49b, similar to the step 48.
- the surface portion 49a extends from the upper end of the step portion 48b toward the inner circumference, and is, for example, a surface similar or approximately similar to the surface portion 48a.
- Step portion 49b extends upward from the inner peripheral end of surface portion 49a, and is, for example, a surface similar or approximately similar to step portion 48b.
- Step portion 49b is connected to annular surface portion 11 of sliding surface 10.
- Surface portion 49a and step portion 48b may be smoothly connected, or may not be smoothly connected at right angles, etc.
- Surface portion 49a and step portion 49b may be smoothly connected, or may not be smoothly connected at right angles, etc.
- Step portion 49b and annular surface portion 11 may be smoothly connected, or may not be smoothly connected at right angles, etc.
- each outer recess 45 forms an opening 42 in the outer peripheral surface 3, similar to the outer recess 40 described above.
- the surface portions 47a, 48a, and 49a of the steps 47, 48, and 49 are not limited to surfaces parallel to a plane perpendicular to the axis x.
- the surface portions 47a, 48a, and 49a may be, for example, flat or approximately flat surfaces inclined upward from the inner periphery to the outer periphery with respect to the plane perpendicular to the axis x, and may not be flat surfaces, and may be surfaces of other shapes.
- the step portions 47b, 48b, and 49b of the steps 47, 48, and 49 are not limited to surfaces parallel to a cylindrical surface.
- the step portions 47b, 48b, and 49b may be, for example, surfaces parallel or approximately parallel to a conical surface that expands in diameter toward the upper side, and may be surfaces of other shapes. Furthermore, the bottom surface 46 has three steps (steps 47, 48, and 49), but the number of steps on the bottom surface 46 is not limited to three, and may be one or two, or four or more.
- each inner recess 35 forms a recess on the inner periphery side of the sliding surface 15, in which the area in a cross section perpendicular to the radial direction or the area in a cross section of a cylindrical surface with the axis x as the central axis gradually decreases from the opening 32 on the inner periphery side to the outer periphery end 36b on the outer periphery side.
- each outer recess 45 forms a recess on the outer periphery side of the sliding surface 15, in which the area in a cross section perpendicular to the radial direction or the area in a cross section of a cylindrical surface with the axis x as the central axis gradually decreases from the opening 42 on the outer periphery side to the inner inner periphery end 46b on the inside.
- the outer periphery end 36b of each inner recess 35 is the outer periphery side end of the bottom surface 36 and is the upper end of the step 39b of the step 39.
- the inner periphery end 46b of each outer recess 45 is the inner periphery side end of the bottom surface 46 and is the upper end of the step 49b of the step 49.
- the seal ring 5 has an inner recess 35 with a bottom surface 36 that expands in diameter as it moves upward in the direction of the axis x, and an outer recess 45 with a bottom surface 46 that contracts in diameter as it moves upward in the direction of the axis x, similar to the inner recess 30 and the outer recess 40 of the seal ring 1 described above.
- the seal ring 5 exerts the effects of dynamic pressure action and dynamic pressure action similar to the seal ring 1, and similar to the seal ring 1, high lubricity can be maintained between the sliding surface 15 of the seal ring 5 and the upper surface 105b of the thrust plate 105, low sliding resistance of the seal ring 5 can be maintained, frictional resistance against the movable scroll 125 can be maintained low, and low drive torque of the drive motor 106 can be maintained.
- each inner recess 35 in the seal ring 5, is a stepped surface that slopes downward from the annular surface portion 11 toward the inner circumference and that intermittently expands in diameter as it moves upward in the direction of the axis x.
- the bottom surface 46 of each outer recess 45 is a surface that slopes downward from the annular surface portion 11 toward the outer circumference and that intermittently reduces in diameter as it moves upward in the direction of the axis x.
- the bottom surface 36 that slopes downward toward the inner circumference can be left for the worn annular surface portion 11, and the bottom surface 46 that slopes downward toward the outer circumference can be left. More specifically, even if the sliding surface 15 of the seal ring 5 is worn, the structure formed by the annular surface portion 11 and the bottom surface 36 before the wear can be maintained between the annular surface portion 11 and the bottom surface 36, and the structure formed by the annular surface portion 11 and the bottom surface 46 before the wear can be maintained between the annular surface portion 11 and the bottom surface 46.
- the seal ring 5 can maintain high lubricity between the sliding surface 15 of the seal ring 5 and the upper surface 105b of the thrust plate 105 based on the dynamic pressure action of each of the inner recesses 35 and each of the outer recesses 45, and can maintain low sliding resistance of the seal ring 5, can maintain low frictional resistance against the movable scroll 125, and can maintain low driving torque of the drive motor 106.
- the seal ring 5 according to the third embodiment of the present invention can suppress the increase over time in the sliding resistance of the seal ring 5 against the thrust plate 105.
- Figure 13 is a cross-sectional perspective view showing a portion of the seal ring 6 according to the fourth embodiment of the present invention
- Figure 14 is a cross-sectional view of the seal ring 6 taken along line D-D in Figure 13.
- the seal ring 6 according to the fourth embodiment of the present invention is different from the seal ring 5 described above in that it has a sliding surface 15 instead of the fixed surface 20 as the other side surface 1b. That is, the seal ring 6 has a pair of sliding surfaces 15 facing each other in the direction of the axis x.
- the upper sliding surface 15 and the lower sliding surface 15 are symmetrical in the direction of the axis x.
- the upper sliding surface 15 and the lower sliding surface 15 do not have to be symmetrical in the direction of the axis x.
- the upper inner recesses 35 and the lower inner recesses 35 may have different shapes and sizes, and may not be located at corresponding positions in the direction of the axis x.
- the upper outer recesses 45 and the lower outer recesses 45 may have different shapes and sizes, and may not be located at corresponding positions in the direction of the axis x.
- both of the two surfaces facing away from each other in the direction of the axis x serve as sliding surfaces 15, so there is no need to check the orientation of the seal ring 6 when attaching it to the scroll compressor 100, making it easy to attach the seal ring 6. Furthermore, the seal ring 6 acts in the same manner as the above-mentioned seal ring 5 when in use, and can exert the same dynamic pressure action and dynamic pressure action effects as the seal ring 5, and can maintain the dynamic pressure action even if friction of the sliding surfaces 15 progresses.
- the seal ring 6 according to the fourth embodiment of the present invention can suppress the increase over time in the sliding resistance of the seal ring 6 against the thrust plate 105.
- each configuration may be appropriately and selectively combined so as to achieve at least some of the above-mentioned problems and effects.
- the shape, material, arrangement, size, etc. of each configuration in the above-mentioned embodiments may be appropriately changed depending on the specific usage mode of the present invention.
- Inlet communication passage 117, 118... seal rings, 119a... pressure relief hole, 119b... pressure regulating valve, 120... fixed scroll, 121... end plate, 122... wrap, 123... recess, 124... discharge hole, 125... movable scroll, 126... end plate, 126a... lower surface, 127... wrap, 128... boss, D1, D2, D3, D4... diameter, ⁇ 1, ⁇ 2... central angle, ⁇ 1, ⁇ 2... inclination angle, r1, r2... width, S... sliding area, x, x1, x2... axis
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Abstract
Description
Claims (16)
- 互いに相対運動する2つの部材間の隙間を閉塞するためのシールリングであって、
軸線周りに環状であり、
前記軸線方向の一方の側に面する環状の面である一方側面と、
前記軸線方向の他方の側に面する環状の面である他方側面と、を備え、
前記一方側面及び前記他方側面の少なくとも一方は、前記2つの部材の一方又は他方に接触した際に、前記2つの部材の一方又は他方との間に隙間を形成し、
前記隙間は、前記一方側面及び前記他方側面の少なくとも一方の、前記2つの部材の一方との接触による摩耗によって、漸減するようになっている、
ことを特徴とするシールリング。 - 前記一方側面及び前記他方側面の少なくとも一方は、前記面する側に向かって突出する部分を複数有している、
ことを特徴とする請求項1に記載のシールリング。 - 前記複数の突出する部分は、前記軸線周りに間隔を空けて設けられている、
ことを特徴とする請求項2に記載のシールリング。 - 前記一方側面は、前記2つの部材の一方に接触した際に、前記2つの部材の一方との間に前記隙間を形成し、
前記他方側面は、前記2つの部材の他方に接触した際に、前記2つの部材の他方との間に前記隙間を形成する、
ことを特徴とする請求項1に記載のシールリング。 - 前記一方側面は、周方向において互いに離間して形成された内周側において開口する凹部である一方側内周側凹部を複数有しており、また、周方向において互いに離間して形成された外周側において開口する凹部である一方側外周側凹部を複数有しており、
前記一方側内周側凹部の各々は、前記軸線方向において前記一方の側に向かうに連れて拡径する面である底面を有しており、
前記一方側外周側凹部の各々は、前記軸線方向において前記一方の側に向かうに連れて縮径する面である底面を有している、
ことを特徴とする請求項1に記載のシールリング。 - 各前記一方側内周側凹部の前記底面は、前記軸線方向において前記一方の側に向かうに連れて連続して拡径している、
ことを特徴とする請求項5に記載のシールリング。 - 各前記一方側外周側凹部の前記底面は、前記軸線方向において前記一方の側に向かうに連れて連続して縮径している、
ことを特徴とする請求項5又は6に記載のシールリング。 - 各前記一方側内周側凹部の前記底面は、前記軸線方向において前記一方の側に向かうに連れて断続して拡径している、
ことを特徴とする請求項5に記載のシールリング。 - 各前記一方側外周側凹部の前記底面は、前記軸線方向において前記一方の側に向かうに連れて断続して縮径している、
ことを特徴とする請求項5又は8に記載のシールリング。 - 前記一方側内周側凹部の各々と前記一方側外周側凹部の各々とは夫々、径方向において背向している、
ことを特徴とする請求項5に記載のシールリング。 - 前記他方側面は、周方向において互いに離間して形成された内周側において開口する凹部である他方側内周側凹部を複数有しており、また、周方向において互いに離間して形成された外周側において開口する凹部である他方側外周側凹部を複数有しており、
前記他方側内周側凹部の各々は、前記軸線方向において前記他方の側に向かうに連れて拡径する面である底面を有しており、
前記他方側外周側凹部の各々は、前記軸線方向において前記他方の側に向かうに連れて縮径する面である底面を有している、
ことを特徴とする請求項5に記載のシールリング。 - 各前記他方側内周側凹部の前記底面は、前記軸線方向において前記他方の側に向かうに連れて連続して拡径している、
ことを特徴とする請求項11に記載のシールリング。 - 各前記他方側外周側凹部の前記底面は、前記軸線方向において前記他方の側に向かうに連れて連続して縮径している、
ことを特徴とする請求項11又は12に記載のシールリング。 - 各前記他方側内周側凹部の前記底面は、前記軸線方向において前記他方の側に向かうに連れて断続して拡径している、
ことを特徴とする請求項11に記載のシールリング。 - 各前記他方側外周側凹部の前記底面は、前記軸線方向において前記他方の側に向かうに連れて断続して縮径している、
ことを特徴とする請求項11又は14に記載のシールリング。 - 前記他方側内周側凹部の各々と前記他方側外周側凹部の各々とは夫々、径方向において背向している、
ことを特徴とする請求項11に記載のシールリング。
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08159051A (ja) | 1994-12-09 | 1996-06-18 | Daikin Ind Ltd | スクロール形圧縮機 |
| JP2002089467A (ja) * | 2000-09-07 | 2002-03-27 | Mitsubishi Heavy Ind Ltd | スクロール型流体機械 |
| WO2021125201A1 (ja) * | 2019-12-17 | 2021-06-24 | イーグル工業株式会社 | 摺動部品 |
| WO2022009769A1 (ja) * | 2020-07-06 | 2022-01-13 | イーグル工業株式会社 | 摺動部品 |
| WO2022009766A1 (ja) * | 2020-07-06 | 2022-01-13 | イーグル工業株式会社 | 摺動部品 |
| WO2023286559A1 (ja) * | 2021-07-13 | 2023-01-19 | Ntn株式会社 | スクロールコンプレッサの環状シール部材 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8079656B2 (en) | 2006-12-22 | 2011-12-20 | Palo Alto Research Center Incorporated | Method for decimation of images |
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- 2023-10-03 WO PCT/JP2023/036090 patent/WO2024075740A1/ja not_active Ceased
- 2023-10-03 KR KR1020257011049A patent/KR20250059509A/ko active Pending
- 2023-10-03 JP JP2024555815A patent/JPWO2024075740A1/ja active Pending
- 2023-10-03 EP EP23874867.7A patent/EP4600531A1/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08159051A (ja) | 1994-12-09 | 1996-06-18 | Daikin Ind Ltd | スクロール形圧縮機 |
| JP2002089467A (ja) * | 2000-09-07 | 2002-03-27 | Mitsubishi Heavy Ind Ltd | スクロール型流体機械 |
| WO2021125201A1 (ja) * | 2019-12-17 | 2021-06-24 | イーグル工業株式会社 | 摺動部品 |
| WO2022009769A1 (ja) * | 2020-07-06 | 2022-01-13 | イーグル工業株式会社 | 摺動部品 |
| WO2022009766A1 (ja) * | 2020-07-06 | 2022-01-13 | イーグル工業株式会社 | 摺動部品 |
| WO2023286559A1 (ja) * | 2021-07-13 | 2023-01-19 | Ntn株式会社 | スクロールコンプレッサの環状シール部材 |
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| Publication number | Publication date |
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| JPWO2024075740A1 (ja) | 2024-04-11 |
| CN119998574A (zh) | 2025-05-13 |
| EP4600531A1 (en) | 2025-08-13 |
| KR20250059509A (ko) | 2025-05-02 |
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