WO2010001683A1 - ダブルメカニカルシール装置 - Google Patents
ダブルメカニカルシール装置 Download PDFInfo
- Publication number
- WO2010001683A1 WO2010001683A1 PCT/JP2009/060268 JP2009060268W WO2010001683A1 WO 2010001683 A1 WO2010001683 A1 WO 2010001683A1 JP 2009060268 W JP2009060268 W JP 2009060268W WO 2010001683 A1 WO2010001683 A1 WO 2010001683A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- seal
- ring
- machine
- rotary
- diameter
- Prior art date
Links
- 238000007789 sealing Methods 0.000 claims description 83
- 230000002093 peripheral effect Effects 0.000 claims description 37
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 238000013461 design Methods 0.000 abstract description 7
- 238000012986 modification Methods 0.000 abstract description 6
- 230000004048 modification Effects 0.000 abstract description 6
- 230000013011 mating Effects 0.000 description 33
- 238000009434 installation Methods 0.000 description 14
- 239000007788 liquid Substances 0.000 description 13
- 238000010791 quenching Methods 0.000 description 11
- 230000000171 quenching effect Effects 0.000 description 11
- 239000012530 fluid Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 229910010271 silicon carbide Inorganic materials 0.000 description 3
- 229920002943 EPDM rubber Polymers 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 229920000459 Nitrile rubber Polymers 0.000 description 2
- 229920006169 Perfluoroelastomer Polymers 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3464—Mounting of the seal
- F16J15/348—Pre-assembled seals, e.g. cartridge seals
- F16J15/3484—Tandem seals
Definitions
- the present invention relates to an outside cartridge type double mechanical seal device which is a double seal in which two seal sliding surfaces are formed on the back surface and is mounted on the outside (outer surface) of the apparatus main body.
- Mechanical seals used as shaft seals for centrifugal pumps, etc. are in a state where there is no liquid on the sliding surface of the mechanical seal because the staffin box where the mechanical seal is installed temporarily becomes negative pressure when starting. May occur, and the sliding surface may be seized or damaged.
- a mechanical seal of this type is conventionally equipped with a double mechanical seal (sometimes simply referred to as a double seal), and a quenching liquid is allowed to flow between the two seals.
- the double seal is often used when it is not desired to let the fluid inside the machine leak out, or when the liquid inside the machine crystallizes when dried.
- Measures to apply double seals to shaft seals of centrifugal pumps, etc. may include remodeling mechanical seals that previously used gland packing.
- a mechanical seal is mounted using the space in the staffin box (for example, refer to Japanese Utility Model Publication No. 3094 (Patent Document 1)).
- the double seal requires a length in the axial direction, even if the space in the staffin box is used, the axial dimension cannot be secured, and the double seal may not be mounted. Therefore, when it is absolutely necessary to mount a double seal, the pump itself must be modified or mounted, or an expensive mechanical seal with a special design must be used.
- Patent Document 2 Japanese Patent Application Publication No. 200347113 (Patent Document 2)). reference.
- Patent Document 2 Japanese Patent Application Publication No. 200347113
- the present invention has been made in view of such problems, and the object thereof is not to use the space in the staffin box, and it is not necessary to perform special design or modification on the mounting device side.
- An object of the present invention is to provide a general-purpose double mechanical seal device that is small enough to be mounted on the outer surface of the device.
- a double mechanical seal device of the present invention is installed on a rotary shaft so as to rotate integrally with the rotary shaft, and a rotary ring in which seal surfaces are formed on both surfaces in the axial direction,
- An inner fixed ring that is disposed on the inner side of the rotary ring and has a seal surface that is in close contact with the seal surface on the inner side of the rotary ring at the end of the rotary ring;
- An outer fixing ring that is disposed on the outer side of the rotating ring and has a sealing surface that is in close contact with the sealing surface on the outer side of the rotating ring at the end of the rotating ring, and the inner fixing ring
- a seal case that is movably supported in a direction, and a seal cover that passes through the rotation shaft and is attached to an outer surface of a device having the rotation shaft, the seal case, the inner fixed ring, the rotation ring, and Accommodates the outer fixed ring
- Both of them include a seal cover that supports the outer fixed
- the seal case that has been conventionally supported in the axial direction can be supported in the radial direction, and this can be disposed at the inner end of the seal cover.
- a small double mechanical seal device can be provided.
- the seal cover has an inner hole through which the rotating shaft passes and which accommodates the seal case, the inner fixed ring, the rotating ring, and the outer fixed ring. And a flange portion having a groove for passing a member for attaching the seal cover to the outer surface of the device, the groove being cut from the outer diameter side to the inner diameter side of the rotating shaft.
- the seal case is supported and installed in the radial direction at the inner end of the seal cover by a screw member installed so as to reach the inner hole in the inner diameter direction further from the inner diameter side of the groove. It is characterized by.
- the double mechanical seal device of the present invention having such a configuration, since the seal case is fixed by the screw member from the bottom of the groove for the embedded bolt of the seal cover, the support of the seal case from the radial direction is supported by the space. Efficient and reliable.
- the double mechanical seal device includes a radial width of a sliding surface between the seal surface of the inner fixed ring and the seal surface of the rotary ring on the inner side, and the outer side of the machine. At least one of the radial widths of the sliding surface between the sealing surface of the stationary ring and the sealing surface outside the machine of the rotating ring is formed to be 3 mm or less.
- the coil spring can be reduced in size while maintaining the same seal pressure by reducing the surface width of the seal sliding surface.
- the size of the apparatus can be reduced.
- a balance value of at least one of the inner fixed ring and the outer fixed ring is formed to be 70% to 130%. .
- the double mechanical seal device of the present invention having such a configuration, in the seal portion formed with a balance value of 70% to 130%, it is possible to seal with the same seal characteristics with respect to both positive and negative pressures, A highly versatile sealing device can be realized.
- the machine-side stationary ring is formed at a predetermined position on the back surface of the seal surface of the machine-side stationary ring.
- An O-ring is interposed between the inner peripheral surface, and the O-ring is installed so as to seal the space on both sides of the seal surface on the back surface of the seal surface.
- the inner diameter of the sliding surface between the sealing surface of the in-machine stationary ring and the sealing surface of the sealing ring are substantially the same, and the O-ring of the sealing case
- the outer diameter of the sliding surface between the sealing surface of the in-machine stationary ring and the sealing surface of the sealing ring is substantially the same.
- the balance value of the inner seal ring is formed in the range of 70% to 130%. Even if it is a case where it is a case where it is a case where it is low pressure, it can seal with a substantially the same sealing characteristic. That is, it can be formed as either a double seal type seal or a tandem type seal.
- the outer fixed ring is formed at a predetermined position on the back surface of the seal surface of the outer fixed ring, and between the outer peripheral surface of the outer fixed ring and the seal cover.
- An O-ring is interposed between the inner peripheral surface, and the O-ring is installed so that the space on both sides of the seal surface is sealed by the O-ring on the back surface of the seal surface.
- the inner diameter of the sliding surface of the sealing surface of the outer stationary ring and the sealing surface of the sealing ring are substantially the same, and the O-ring of the sealing cover And the outer diameter of the sliding surface between the sealing surface of the machine-side stationary ring and the sealing surface of the sealing ring is substantially the same.
- the balance value of the outer seal ring is formed to be 70% to 130%, so that the pressure in the intermediate chamber is made higher than the pressure outside the machine. Even if it is a case where it is a case where it is a case where it is low pressure, it can seal with a substantially the same sealing characteristic.
- At least one of a combination of the material of the inner fixed ring and the material of the rotating ring and a combination of the material of the outer fixed ring and the material of the rotating ring is silicon carbide (SiC). And silicon carbide (SiC), carbon and silicon carbide (SiC), cemented carbide and cemented carbide, or carbon and cemented carbide.
- the double mechanical seal device of the present invention having such a configuration, it is possible to provide a general-purpose and highly durable seal device that can be used at high temperatures with little wear.
- FIG. 1 is a cross-sectional view illustrating a configuration of a sealing device according to an embodiment of the present invention, and is a cross-sectional view illustrating a state in which the sealing device is mounted on a staffin box.
- FIG. 2 is an axial plan view showing a state in which the sealing device shown in FIG. 1 is fitted to the rotating shaft.
- FIG. 3 is an enlarged view of a fitting installation location between the in-machine seal ring and the seal case of the sealing device shown in FIG. 1, and is a diagram for explaining the balance value of the sealing device.
- a sealing device according to an embodiment of the present invention will be described with reference to FIGS.
- it is a sealing device used as a shaft seal of a centrifugal pump, has a double seal in which two sliding surfaces are configured to be back to back, and is mounted in the form of a cartridge on the outer surface of a staffin box
- the present invention will be described using a sealing device as an example.
- FIG. 1 is a cross-sectional view showing the configuration of the sealing device 1 of the present embodiment, and is a cross-sectional view in which the sealing device 1 is mounted as a cartridge on an outer surface 82 of a device main body (staffin box) 80.
- 2 is an axial plan view showing a state in which the sealing device 1 shown in FIG.
- FIG. 3 is an enlarged view of a fitting installation location between the in-machine seal ring 41 and the seal case 44 of the sealing device 1 shown in FIG. 1 and is a diagram for explaining the balance value of the sealing device 1. .
- a shaft hole 81 is formed in the staffin box 80 of the centrifugal pump, and a rotation shaft 70 rotatably supported by a bearing (not shown) passes through the shaft hole 81. .
- the sealing device 1 according to the present invention is attached to the outer surface 82 around the shaft hole 81 of the staffin box 80 by embedded bolts 83 installed on the outer surface 82.
- the shaft hole 81 side (left side in the figure) of the staffin box 80 is the inside space A, and the opposite side (right side in the figure) is the outside space and the atmosphere space B.
- the sealing device 1 includes a seal cover 10, a sleeve 20, a mating ring 30, an in-machine seal ring 41 having an in-machine seal ring 41 and an in-machine seal surface 32 of the mating ring 30, and an atmosphere side seal ring 51 and a mating ring 30.
- An outboard side (atmosphere side) seal portion 50 having an outboard side sealing surface 33 of the ting ring 30 is provided.
- the inner surface of the seal cover 10 is formed in a flange shape, and the planar shape in the axial direction is formed in a substantially square shape as shown in FIG.
- installation grooves 15 are formed that are cut from the outer corner portion to the inner diagonal direction.
- the seal cover 10 has an internal hole 11 that is continuous with the shaft hole 81 of the staffin box 80 and allows the rotary shaft 70 to pass when the seal cover 10 is attached to the staffin box 80. Is formed.
- the peripheral surface of the inner hole 11 is in order from the inner side to the outer side direction of the seal case mounting surface 11a, the first throttle surface 11b, the expansion surface 11c, the second throttle surface 11d, and the first It is formed on the three diaphragm surfaces 11f.
- a positioning portion 12 is formed at the end of the seal cover 10 on the outside of the machine.
- the positioning portion 12 has a positioning groove 12 a on the outer peripheral surface of the end portion of the seal cover 10.
- each of the installation grooves 15 described above is further directed diagonally inward, and penetrates the seal case mounting surface 11 a of the seal cover 10.
- a screw groove 17 is formed.
- the seal cover 10 is formed with four radial fluid flow paths that connect from the outer peripheral surface to the internal hole 11.
- the four fluid flow paths are three quenching liquid injection paths 13 and one quenching liquid discharge path 14.
- a pipe screw hole that can be connected to a pipe is formed in the port of each flow path 13 and 14.
- each of the flow paths 13 and 14 communicates with an opening formed in the expansion surface 11c of the inner hole 11 of the seal cover 10, and the inner seal part 40, the outer seal part 50, and the inner holes of the seal cover 10 are connected.
- 11 is connected to an intermediate chamber 19 of the sealing device 1 surrounded by 11.
- the quenching liquid injected through the pipe is injected into the intermediate chamber 19 from the quenching liquid injection path 13 and flows directly to the outer peripheral surfaces of the in-machine seal part 40 and the out-of-machine seal part 50. And discharged from the quenching liquid discharge path 14. Thereby, the heat generated when the seal sliding surface of each seal portion slides is cooled, and impurities adhering to each seal portion are cleaned.
- the seal case 44 is installed on the seal case mounting surface 11a of the seal cover 10 by the set screw 18 screwed into the screw groove 17 formed at the back end of the installation groove 15 of the seal cover 10 as described above. Yes.
- the seal case 44 is installed at the innermost end of the seal cover 10, in other words, at the end of the seal device 1.
- the outer peripheral corner portion of the outer side of the seal case 44 is formed with an L-shaped groove in the circumferential direction, and also in the inner corner portion of the first throttle surface 11b of the inner hole 11 of the seal cover 10 facing the circumferential direction.
- An L-shaped groove is formed in the.
- An O-ring 46 is disposed in an annular space having a rectangular cross section formed by these opposing L-shaped grooves, whereby the seal cover 10 and the seal case 44 are sealed.
- an in-machine seal ring 41 is fitted and installed so as to be axially movable.
- a fixing pin 48 that protrudes outward in the axial direction and is fitted into a guide groove 47 formed in a flange portion 42 of the inner seal ring 41 described later is installed on the outer end surface of the seal case 44.
- a plurality of spring seats are provided in the circumferential direction on the outer end face of the seal case 44, and a coil spring 49 is held between the opposite face of the flange portion 42 of the inner seal ring 41 described later. It has a configuration.
- the in-machine seal ring 41 is a seal ring that constitutes one seal surface of the in-machine seal part 40, and is fitted and installed on the inner peripheral side of the seal case 44 so as to be axially movable as described above.
- the machine-side seal ring 41 has a seal surface 43 formed on the machine-side end surface.
- the seal surface 43 is slidably in close contact with the machine-side seal surface 32 of a rotating ring (mate ring) 31 described later.
- An inner seal portion 40 is configured.
- a stepped portion 41 a having a step in the axial direction is formed on the outer peripheral surface of the machine inner seal ring 41.
- a stepped portion 44a having a step in the axial direction is formed on the inner peripheral surface of the seal case 44 so as to face the stepped portion 41a of the inboard seal ring 41 (see FIGS. 1 and 3).
- An annular space having a rectangular cross section is formed by the stepped portion 41a and the stepped portion 44a, and an O-ring 45 is disposed in the annular section.
- the seal case 44 and the in-machine seal ring 41 are fitted to each other while being sealed between them.
- fluorine rubber, nitrile rubber, EPDM, perfluoroelastomer, or the like is used as the material of the O-ring 45.
- the outer peripheral side of the machine inner seal ring 41 is formed in a flange portion 42, and a guide groove 47 is formed in the flange portion 42 in the axial direction.
- a fixing pin 48 formed on the outer end surface of the seal case 44 is inserted into the guide groove 47.
- the fixing pin 48 and the guide groove 47 are in a state in which they can be moved relative to each other in the axial direction and locked in the circumferential direction. Thus, it is movable in the axial direction, and is installed so as not to rotate in the circumferential direction (rotating direction of the rotating shaft 70).
- a plurality of spring seats are provided in the circumferential direction on the surface of the flange portion 42 of the machine inner seal ring 41 that faces the seal case 44, and the spring seat formed on the machine outer end face of the seal case 44 A coil spring 49 is held therebetween. Thereby, the inner seal ring 41 is pressed outward in the axial direction, that is, in the direction of the mating ring 30.
- a relatively large gap is formed between the inner peripheral surface side of the inner seal ring 41 and the outer peripheral surface of the rotary shaft 70, and the sealed fluid contained in the inner space A contains slurry. Even in such a case, the sealed fluid can be distributed without being solidified and clogged.
- the surface width (the length in the radial direction) of the seal surface (sliding surface) 43 is 3 mm or less.
- the thickness is preferably 1 mm to 3 mm.
- the sealing surface 43 may have a shape that protrudes in a triangular shape toward the inboard side sealing surface 32 of the mating ring 30.
- the in-machine seal ring 41 of the in-machine seal 40 of the present embodiment as shown in FIG. 3, with respect to the annular space in which the O-ring 45 is disposed, The diameter (outer diameter) B I of the surface parallel to the shaft circumferential surface, that is, the inner diameter B I of the annular space in which the O-ring 45 is disposed, and the inner diameter D I of the seal surface 43 are configured to be equal. Yes. Further, the diameter (inner diameter) B O of the surface parallel to the axial peripheral surface of the stepped portion 44 a of the seal case 44, that is, the outer diameter B O of the annular space in which the O-ring 45 is disposed, and the outer diameter of the seal surface 43.
- the balance value BV related to the in-machine seal ring 41 of the in-machine seal part 40 represented by the following formula (1) is 100%, and any side of the sealing surface of the in-machine seal part 40 is Even if the pressure becomes high, the sealing surface can be formed with the same sealing performance. That is, the in-machine seal 40 is a seal that can handle both positive and negative pressures. Even if this balance value is not 100%, the same effect can be obtained if it is in the range of 70% to 130%.
- the third diaphragm surface 11f which is the inner peripheral surface on the outermost side of the inner hole 11 of the seal cover 10, has a smaller inner diameter than the second diaphragm surface 11d adjacent to the inner side.
- the portion of the third diaphragm surface 11f is formed in a shape that protrudes annularly in the direction of the rotation shaft 70.
- a vertical surface 11e that is perpendicular to the axial direction and faces the inside of the machine is formed between the second diaphragm surface 11d and the third diaphragm surface 11f that form the step.
- an outboard seal ring 51 is fitted and installed so as to be axially movable.
- the vertical surface 11e is provided with a fixing pin 58 that protrudes inward in the axial direction and is fitted into a guide groove 57 formed in a flange portion 52 of the outer seal ring 51 described later.
- a plurality of spring seats are provided in the circumferential direction on the machine end face of the vertical surface 11e, and a coil spring 59 is held between the opposite faces of the flange portion 52 of the machine seal ring 51 described later. It has a configuration.
- the machine-side seal ring 51 is a seal ring that constitutes one seal surface of the machine-side seal part 50, and as described above, axially extends toward the inner peripheral side of the third throttle surface 11 f of the inner hole 11 of the seal cover 10. It is fitted and installed movably.
- the machine-side seal ring 51 has a seal surface 53 formed on the machine-side end surface, and the seal surface 53 is slidably in close contact with a machine-side seal surface 33 of a rotating ring (a mating ring) 31 described later.
- the outer seal portion 50 is configured.
- the configuration of the machine outside seal ring 51 is the same as that of the machine inside seal ring 41. That is, the in-machine seal ring 41 and the out-of-machine seal ring 51 are symmetrically disposed on both sides of the in-machine and out-of-machine sides with the mating ring 30 as the axis of symmetry.
- a stepped portion 51 a having a step in the axial direction is formed on the outer peripheral surface of the machine-side seal ring 51.
- the inner side of the third aperture surface 11f of the inner hole 11 of the seal cover 10, that is, the corner between the third aperture surface 11f and the vertical surface 11e is also opposed to the stepped portion 51a of the outer seal ring 51.
- a staircase portion 54a having a step in the axial direction is formed.
- the staircase portion 51a and the staircase portion 54a form an annular space having a rectangular cross section, and an O-ring 55 is disposed in the annular section.
- the inner hole 11 of the seal cover 10 and the outer seal ring 51 are sealed by the O-ring 55 and are fitted so as to be movable in the axial direction.
- the material of the O-ring 55 fluorine rubber, nitrile rubber, EPDM, perfluoroelastomer, or the like is used.
- the outer peripheral side of the outer seal ring 51 is formed in a flange portion 52, and a guide groove 57 is formed in the flange portion 52 in the axial direction.
- a fixing pin 58 formed on the vertical surface 11 e of the inner hole 11 of the seal cover 10 is inserted into the guide groove 57.
- the fixing pin 58 and the guide groove 57 are relatively movable in the axial direction and locked in the circumferential direction, whereby the machine-side seal ring 51 is axially moved with respect to the seal cover 10. It is movable and is installed so as not to rotate in the circumferential direction (rotating direction of the rotating shaft 70).
- a plurality of spring seats are provided in the circumferential direction on the surface of the flange portion 52 of the outside seal ring 51 facing the vertical surface 11e of the inner hole 11 of the seal cover 10 and formed on the vertical surface 11e.
- a coil spring 59 is held between the spring seat.
- the outer seal ring 51 is pressed outward in the axial direction, that is, in the direction of the mating ring 30.
- the surface width (the length in the radial direction) of the seal surface (sliding surface) 53 is 3 mm or less.
- the thickness is preferably 1 mm to 3 mm.
- the sealing surface 53 may protrude in a triangular shape toward the outside sealing surface 33 of the mating ring 30.
- the annular space in which the O-ring 55 is disposed As with the inboard seal ring 41 described above with reference to FIG. 3, the annular space in which the O-ring 55 is disposed, The diameter (outer diameter) (B I ) of the surface parallel to the axial peripheral surface of the stair portion 51a of the machine-side seal ring 51, that is, the inner diameter (B I ) of the annular space in which the O-ring 55 is disposed, and the seal surface The inner diameter (D I ) of 53 is equal.
- the outer diameter (B O ) and the outer diameter (D O ) of the seal surface 53 are configured to be equal. With this configuration, the balance value related to the outboard seal ring 51 of the outboard seal portion 50 is 100%. In the present invention, even if this balance value is not in the range of 100%, the same effect can be obtained if it is in the range of 70% to 130%.
- the mating ring (rotating ring) 31 having the other sealing surfaces 32 and 33 of the in-machine seal 40 and the out-of-machine seal 50 is further fitted and installed on the sleeve 20 fitted and installed on the rotary shaft 70.
- the sleeve 20 is closely fitted to the peripheral surface of the rotary shaft 70 with the O-ring 23 interposed, and is fixedly installed on the rotary shaft 70 by the sleeve collar 21 at the outer end of the machine.
- the sleeve collar 21 is fitted to the outer peripheral surface of the outer end portion of the sleeve 20 and is fixed to the rotating shaft 70 by the set screw 22.
- a mating ring 30 is fitted to the end of the sleeve 20 on the inner side.
- a machine collar end portion of the sleeve collar 21 is formed in a mating ring installation portion 24 in which the mating ring 30 is fitted and installed.
- the mating ring installation portion 24 of the sleeve 20 is located between the convex portion 25 that defines the position of the outer end of the machine by abutting the mating ring 30 and the inner peripheral surface of the mating ring 30 that is fitted.
- An intervening O-ring 27, a groove 26 for interposing the O-ring 27, a knock pin 29 for preventing the mating ring 30 fitted to the sleeve 20 from coming off and defining the position inside the machine, and the knock pin 29 Has a hole 28 for fitting.
- Positioning grooves 12a are formed in the outer peripheral portion of the seal cover 10 on the outside of the machine, and a plurality of set plates 63 are equally distributed along the positioning grooves 12a. It arrange
- Each set plate 63 is fixedly installed by a socket bolt 64.
- the set plate 63 and the sleeve collar 21 are brought into a predetermined positional relationship, and the seal cover 10 to which the set plate 63 is mounted and the sleeve collar 21 are integrated.
- the relative positional relationship with the sleeve 20 that is constructed is set to a desired positional relationship.
- the mating ring 30 installed on the sleeve 20 and the in-machine seal ring 41 and the out-of-machine seal ring 51 mounted on the seal cover 10 are in a desired positional relationship.
- the surface 43 and the machine-side seal surface 32 of the mating ring 30, and the seal surface 53 of the machine-side seal ring 51 and the machine-side seal surface 33 of the mating ring 30 are each in a predetermined positional relationship and at a predetermined pressure.
- An in-machine seal part 40 and an out-of-machine seal part 50 that slide closely are configured.
- the mating ring 30 is defined by the above-described mating ring installation portion 24 at the end of the inner side of the sleeve 20, that is, on both sides in the axial direction by the convex portion 25 and the sleeve collar 21.
- An O-ring 27 is interposed between the sleeve 20 and the surface, and the sleeve 20, in other words, a predetermined position on the rotary shaft 70 is hermetically fitted.
- the end surface on the machine inner side of the mating ring 30 is formed on the machine inner seal surface 32 that slides closely with the seal surface 43 of the machine inner seal ring 41 and constitutes a part of the machine inner seal portion 40.
- the end surface of the outside of the mating ring 30 is formed on an outboard seal surface 33 that slides in close contact with the seal surface 53 of the outboard seal ring 51 and constitutes a part of the outboard seal portion 50. ing.
- the quenching liquid injection path 13 and the quenching liquid discharge path 14 formed in the seal cover 10 communicate with the intermediate chamber 19, and the quenching liquid is filled at a predetermined pressure.
- the flow of the quenching liquid is configured to pass through the outer peripheral surfaces of the in-machine seal 40 and the out-of-machine seal 50.
- the pressure in the intermediate chamber 19 is set to be higher than the pressure in the machine interior space A.
- the pressure in the intermediate chamber 19 is set to the machine interior. Even if it is lower than the pressure in the space A, it can be handled.
- the pressure in the intermediate chamber 19 may be arbitrarily determined according to the use application of the sealing device 1, the purpose, the type of fluid to be sealed, and the like.
- the sealing device 1 includes a gasket 60 interposed between the outer surface 82 of the staffin box 80 and the inboard end surface of the seal cover 10 when the seal cover 10 is installed in the staffin box 80.
- the gasket 60 is made of resin or metal, and prevents the sealed fluid in the interior space A from leaking between the seal cover 10 and the staffin box 80.
- the mating ring 30, the in-machine seal ring 41, and the out-of-machine seal ring 51 are each made of silicon carbide (silicon carbide, SiC), carbon, cemented carbide, or the like.
- the inner seal ring 41 or the combination of the outer seal ring 51 and the mating ring 30 is a combination of silicon carbide (SiC) and silicon carbide (SiC), respectively, and a combination of carbon and silicon carbide (SiC).
- SiC silicon carbide
- SiC silicon carbide
- SiC silicon carbide
- SiC silicon carbide
- SiC silicon carbide
- a double mechanical seal device can be realized in the cartridge type sealing device without using the internal space of the staffin box 80. Therefore, according to the sealing device 1 of the present embodiment, it is possible to easily double the desired device without special design or modification of the device side such as a pump regardless of the size of the staffin box 80. A seal can be installed.
- the seal case 44 is attached to the seal cover 10 by a set screw 18 that is screwed inward in the radial direction from the back end portion of the installation groove 15 of the seal cover 10 through the screw groove 17. It is fixedly installed at the innermost end.
- the seal case 44 that defines the axial position of the in-machine seal ring 41 is supported and fixed in the axial direction in order to clarify the mounting position thereof. It was supposed to require some length in the direction.
- the thickness in the thickness direction (axial direction) of the sealing device 1 can be reduced. .
- the surface widths of the seal surface 43 and the seal surface 53 of the in-machine seal ring 41 and the out-of-machine seal ring 51 are set to 3 mm or less, more preferably 1 to 3 mm. Yes. Therefore, even if small springs are used as the coil spring 49 and the coil spring 59, the surface pressure of the seal sliding surface can be appropriately maintained. Therefore, also in this respect, the apparatus can be downsized without deteriorating the sealing performance.
- the sealing device 1 does not use the space in the staffin box 80 and accommodates a double seal including the inboard seal part 40 and the outboard seal part 50 inside.
- the axial thickness can be reduced to 50 mm or less.
- the corresponding shaft diameter of the rotating shaft 70 is not limited to a specific value and can correspond to an arbitrary shaft diameter. However, if it is at least between 20 mm and 100 mm, the sealing device 1 can have a thickness of 50 mm or less with the same configuration. Can be realized.
- the operating pressure of each sealing device 1 is preferably 2 MPa or less, and more preferably, for example, 1.5 MPa or less.
- the sealing device 1 has the inner diameter B I of the annular space in which the O-ring 45 is disposed in the inner seal ring 41 of the inner seal portion 40. And the inner diameter D I of the seal surface 43 are made equal, and the outer diameter B O of the annular space in which the O-ring 45 is disposed and the outer diameter D O of the seal surface 43 are made equal.
- the balance value (balance ratio) regarding the in-machine seal ring 41 is configured to be approximately 100%. Therefore, the seal surface can be formed with the same sealing performance regardless of which side of the seal surface of the in-machine seal portion 40 has a high pressure.
- both positive and negative pressures or in other words, substantially the same sealing performance for any use mode when the pressure of the quenching liquid is larger or smaller than the fluid pressure in the in-machine space A.
- the sealing device 1 of the present embodiment it is possible to attach the outer surface of the device without using the internal space of the staffin box 80 and without performing any special design or modification on the device side. It was possible to realize a cartridge-type double seal that was sufficiently small.
- the shapes and installation configurations of the machine inner side seal ring 41 and the machine outside seal ring 51 may be arbitrarily changed.
- these balance values are approximately 100%, slight changes may be made.
- the balance value is in the range of 70% to 130%, substantially the same effect as that of the above-described embodiment can be obtained, and the present invention may be implemented in such a form. .
- the structure of the installation location of the O-ring 45 or the O-ring 55 may be changed, the surface width of the seal surface 43 or the seal surface 53 and the position of the installation location in the radial direction. May be changed.
- the inboard seal ring 41 of the inboard seal part 40 and the outboard seal ring 51 of the outboard seal part 50 are the same configuration, and the mating ring 30 is the axis of symmetry. They were arranged in the axial direction.
- the configuration of the inboard seal ring 41 and the outboard seal ring 51 may be different.
- the outer side seal ring 51 is considered to always have a high pressure on the intermediate chamber 19 side, and the outer side seal part 50 does not need to cope with both positive and negative pressures.
- the balance value may be changed from 100%.
- the present invention can be used for shaft seals of centrifugal pumps.
- it can be used as a shaft seal device for the rotating shaft.
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Abstract
Description
本実施形態においては、遠心ポンプの軸シールとして使用されるシール装置であって、2つの摺動面を背面合わせに構成したダブルシールを有し、スタフィンボックスの外面にカートリッジ形態で装着されるシール装置を例示して本発明を説明する。
図2は、図1に示すシール装置1を回転軸70に嵌合した状態を示す軸方向平面図である。
また、図3は、図1に示すシール装置1の機内側シールリング41とシールケース44との嵌合設置箇所の拡大図であり、シール装置1のバランス値の説明をするための図である。
なお、図1においてはスタフィンボックス80の軸孔81側(図示左側)が機内側空間Aであり、その軸方向反対側(図示右側)が機外側空間であって大気空間Bである。
内部孔11の周面(シールカバー10の内周面)は、機内側から機外側方向に順にシールケース装着面11a、第1絞り面11b、拡張面11c、第2絞り面11d、及び、第3絞り面11fに形成されている。
このような構成において、配管を介して注入されたクエンチング液は、クエンチング液注入路13から中間室19に注入され、直接に機内側シール部40及び機外側シール部50の外周面に流され、クエンチング液排出路14から排出される。これにより、各シール部のシール摺動面の摺動時の発熱が冷却されると共に、各シール部に付着している不純物が洗浄される。
また、シールケース44の機外側端面には、軸方向機外側に突出し、後述する機内側シールリング41のフランジ部42に形成された案内溝47に嵌入される固定ピン48が設置されている。
また、シールケース44の同じく機外側端面には、周方向へ複数のバネ座が設けられており、後述する機内側シールリング41のフランジ部42の対向面との間にコイルスプリング49を保持する構成となっている。
なお、Oリング45の材質は、フッ素ゴム、ニトリルゴム、EPDM、パーフロロエラストマなどが用いられる。
このようにシール面43の面幅を通常よりも狭くすることにより、機内側シールリング41をメイティングリング30方向に押圧するコイルスプリング49の圧力が同一の場合には、シール面43と機内側シール面32との面圧を高めることができる。換言すれば、同じ面圧(シール面圧)を得る場合には、シール面幅を狭くしておくことにより、コイルスプリング49の押圧力を少なくすることが可能となり、コイルスプリング49として小型のスプリングを用いることが可能となる。その結果、シール面圧を下げることなく、小型のスプリングを用いることができ、シール装置1を小型化することが可能となる。
このように構成することにより、次式(1)で表される、機内側シール部40の機内側シールリング41に関するバランス値BVは100%となり、機内側シール部40のシール面のいずれの側が高圧となったとしても、同じシール性能でシール面を形成することができる。すなわち、機内側シール部40が正負両圧に対応可能なシール部となる。なお、このバランス値は100%でなくとも、70%~130%の範囲であれば同様の作用が得られる。
BV=S2 /S1 ×100 …(1)
但し、S1 =π(DO 2-DI 2 )/4
S2 =π(BO 2-BI 2 )/4
また、垂直面11eには、軸方向機内側に突出し、後述する機外側シールリング51のフランジ部52に形成された案内溝57に嵌入される固定ピン58が設置されている。
また、垂直面11eの同じく機外側端面には、周方向へ複数のバネ座が設けられており、後述する機外側シールリング51のフランジ部52の対向面との間にコイルスプリング59を保持する構成となっている。
なお、Oリング55の材質は、フッ素ゴム、ニトリルゴム、EPDM、パーフロロエラストマなどが用いられる。
このようにシール面53の面幅を通常よりも狭くすることにより、機外側シールリング51をメイティングリング30方向に押圧するコイルスプリング59の圧力が同一の場合には、シール面53と機外側シール面33との摺動面圧を高めることができる。換言すれば、同じ摺動面圧(シール面圧)を得る場合には、シール面幅を狭くしておくことにより、コイルスプリング59の押圧力を少なくすることが可能となり、コイルスプリング59として小型のスプリングを用いることが可能となる。その結果、シール面圧を下げることなく、小型のスプリングを用いることができ、シール装置1を小型化することが可能となる。
このように構成することにより、機外側シール部50の機外側シールリング51に関するバランス値は、100%となる。なお、本発明においては、このバランス値は100%でなくとも、70%~130%の範囲であれば同様の作用が得られる。
スリーブ20は、Oリング23を介在させて回転軸70の周面に密接に嵌合されており、機外側端部においてスリーブカラー21により回転軸70に固定設置されている。スリーブカラー21は、スリーブ20の機外側端部の外周面に嵌合し、セットスクリュー22により回転軸70に対して固定される。これにより、スリーブ20とスリーブカラー21とは一体的に回転軸70に固定設置される。このスリーブ20の機内側端部に、メイティングリング30が嵌合される。
スリーブ20のメイティングリング設置部24は、メイティングリング30を当接させることによりその機外側端部の位置を規定する凸部25、嵌合したメイティングリング30の内周面との間に介在されるOリング27及びOリング27を介在させるための溝26、スリーブ20に嵌合したメイティングリング30の抜けを防止するとともにその機内側の位置を規定するためのノックピン29及びそのノックピン29を嵌着するための孔28を有する。
一方、メイティングリング30の機外側の端面は、機外側シールリング51のシール面53と密接し摺動する機外側シール面33に形成されており、機外側シール部50の一部を構成している。
中間室19には、前述したようにシールカバー10に形成されたクエンチング液注入路13及びクエンチング液排出路14が連通しており、クエンチング液が所定の圧力で充填されているとともに、機内側シール部40及び機外側シール部50の外周面をクエンチング液の流れが通過するように構成されている。これにより、各シール部のシール摺動面の摺動時の発熱が冷却されると共に、各シール部に付着している不純物が洗浄される。
なお、通常のダブルシールとして用いる場合には、中間室19の圧力は機内側空間Aの圧力よりも高圧に設定されるが、本実施形態のシール装置1は、中間室19の圧力が機内側空間Aの圧力よりも低い場合であっても対応可能なものである。中間室19の圧力は、シール装置1の使用用途、目的、封止対象流体の種類等に応じて任意に決定してよい。
なお、回転軸70の対応軸径は、特定の値に限定されず任意の軸径に対応可能であるが、少なくとも20mm~100mmの間であれば、同一の構成により厚み50mm以下でシール装置1を実現することができる。
また、その場合の各シール装置1の使用圧力は、2MPa以下であることが好ましく、より好ましくは、例えば1.5MPa以下の使用圧力が好適である。
例えば、これらのバランス値は略100%としたが、若干の変更を行ってもよい。例えば、バランス値70%~130%の範囲であれば、実質的に前述した実施形態の作用と同じ作用効果が得られるものであり、本願発明をそのような形態で実施しても何ら差し支えない。
Claims (7)
- 回転軸と一体に回転するように当該回転軸に設置され、軸方向の両面にシール面が形成されている回転環と、
前記回転環の機内側に配置され、前記回転環側の端部に、当該回転環の機内側の前記シール面に密接摺動するシール面が形成されている機内側固定環と、
前記回転環の機外側に配置され、前記回転環側の端部に、当該回転環の機外側の前記シール面に密接摺動するシール面が形成されている機外側固定環と、
前記機内側固定環を軸方向に移動自在に支持するシールケースと、
前記回転軸が貫通されて、当該回転軸を有する装置の外面に取り付けられるシールカバーであって、前記シールケース、前記機内側固定環、前記回転環及び前記機外側固定環を収容するとともに、機外側の端部において前記機外側固定環を軸方向に移動自在に支持するシールカバーとを有し、
前記シールケースは、前記シールカバーから径方向に支持されて、当該シールカバーの機内側の端部に設置されていることを特徴とするダブルメカニカルシール装置。 - 前記シールカバーは、
前記回転軸が貫通されるとともに前記シールケース、前記機内側固定環、前記回転環及び前記機外側固定環を収容する内部孔と、
当該シールカバーを前記装置の外面に取り付けるための部材を通過させるための溝であって、前記回転軸の外径側から内径側方向に切り込まれた溝を有するフランジ部と
を有し、
前記シールケースは、前記溝の内径側からさらに内径方向に前記内部孔に達するように設置される螺子部材により、前記シールカバーの機内側の端部において径方向に支持され設置されている
ことを特徴とする請求項1に記載のダブルメカニカルシール装置。 - 前記機内側固定環の前記シール面と前記回転環の機内側の前記シール面との摺動面の径方向の幅、及び、前記機外側固定環の前記シール面と前記回転環の機外側の前記シール面との摺動面の径方向の幅の少なくともいずれか一方が、3mm以下に形成されていることを特徴とする請求項1又は2に記載のダブルメカニカルシール装置。
- 前記機内側固定環及び前記機外側固定環の少なくともいずれか一方のバランス値が、70%~130%に形成されていることを特徴とする請求項1~3のいずれかに記載のダブルメカニカルシール装置。
- 前記機内側固定環は、当該機内側固定環の前記シール面の背面の所定箇所において、当該機内側固定環の外周面と前記シールケースの内周面との間にOリングを介在させて、当該Oリングにより前記シール面の両側の空間を当該シール面の背面においてシールするように設置されており、
当該機内側固定環の前記Oリングが配置されている前記外周面の径と、当該機内側固定環の前記シール面と前記密封環の前記シール面との摺動面の内径とがほぼ同じであり、
前記シールケースの前記Oリングが配置されている前記内周面の径と、当該機内側固定環の前記シール面と前記密封環の前記シール面との摺動面の外径とがほぼ同じであることを特徴とする請求項4に記載のダブルメカニカルシール装置。 - 前記機外側固定環は、当該機外側固定環の前記シール面の背面の所定箇所において、当該機外側固定環の外周面と前記シールカバーの内周面との間にOリングを介在させて、当該Oリングにより前記シール面の両側の空間を当該シール面の背面においてシールするように設置されており、
当該機外側固定環の前記Oリングが配置されている前記外周面の径と、当該機外側固定環の前記シール面と前記密封環の前記シール面との摺動面の内径とがほぼ同じであり、
前記シールカバーの前記Oリングが配置されている前記内周面の径と、当該機外側固定環の前記シール面と前記密封環の前記シール面との摺動面の外径とがほぼ同じであることを特徴とする請求項4に記載のダブルメカニカルシール装置。 - 前記機内側固定環の材質と前記回転環の材質との組み合わせ、及び、前記機外側固定環の材質と前記回転環の材質との組み合わせの少なくとも一方が、炭化ケイ素(SiC)と炭化ケイ素(SiC)の組み合わせ、カーボンと炭化ケイ素(SiC)の組み合わせ、超硬合金と超硬合金の組み合わせ、あるいは、カーボンと超硬合金の組み合わせであることを特徴とする請求項1~6のいずれかに記載のダブルメカニカルシール装置。
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JP2010518969A JP5345619B2 (ja) | 2008-07-04 | 2009-06-04 | ダブルメカニカルシール装置 |
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WO2014069098A1 (ja) * | 2012-11-02 | 2014-05-08 | イーグル工業株式会社 | メカニカルシール装置 |
JPWO2014069098A1 (ja) * | 2012-11-02 | 2016-09-08 | イーグル工業株式会社 | メカニカルシール装置 |
JP2016166628A (ja) * | 2015-03-09 | 2016-09-15 | 日本ピラー工業株式会社 | ダブルメカニカルシール |
JP2016166630A (ja) * | 2015-03-09 | 2016-09-15 | 日本ピラー工業株式会社 | ドライコンタクトシール |
JP2017089800A (ja) * | 2015-11-12 | 2017-05-25 | イーグル工業株式会社 | 密封装置 |
JP2021011943A (ja) * | 2019-07-09 | 2021-02-04 | イーグルブルグマンジャパン株式会社 | メカニカルシール |
JP7154714B2 (ja) | 2019-07-09 | 2022-10-18 | イーグルブルグマンジャパン株式会社 | メカニカルシール |
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JPWO2010001683A1 (ja) | 2011-12-15 |
EP2299149B1 (en) | 2016-09-14 |
EP2299149A4 (en) | 2015-09-30 |
JP5345619B2 (ja) | 2013-11-20 |
CN102084161A (zh) | 2011-06-01 |
US20110101617A1 (en) | 2011-05-05 |
CN102084161B (zh) | 2015-05-27 |
US8382121B2 (en) | 2013-02-26 |
EP2299149A1 (en) | 2011-03-23 |
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