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WO2013128535A1 - Structure d'étanchéité d'axe pour réceptacle - Google Patents

Structure d'étanchéité d'axe pour réceptacle Download PDF

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Publication number
WO2013128535A1
WO2013128535A1 PCT/JP2012/054696 JP2012054696W WO2013128535A1 WO 2013128535 A1 WO2013128535 A1 WO 2013128535A1 JP 2012054696 W JP2012054696 W JP 2012054696W WO 2013128535 A1 WO2013128535 A1 WO 2013128535A1
Authority
WO
WIPO (PCT)
Prior art keywords
container
rotating member
seal structure
shaft
fixed
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
Application number
PCT/JP2012/054696
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English (en)
Japanese (ja)
Inventor
博 青山
澤田　貴彦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to PCT/JP2012/054696 priority Critical patent/WO2013128535A1/fr
Publication of WO2013128535A1 publication Critical patent/WO2013128535A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
    • B63H25/52—Parts for steering not otherwise provided for
    • 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
    • F16J15/50—Sealings between relatively-movable members, by means of a sealing without relatively-moving surfaces, e.g. fluid-tight sealings for transmitting motion through a wall
    • F16J15/52—Sealings between relatively-movable members, by means of a sealing without relatively-moving surfaces, e.g. fluid-tight sealings for transmitting motion through a wall by means of sealing bellows or diaphragms

Definitions

  • the present invention relates to a shaft seal structure for a container that is pivotally arranged on a rudder in seawater of a ship.
  • Patent Document 2 there is a description that a seal is used for a rotating part of an underwater work vehicle, and even if the water pressure outside the container in water rises, a wave is applied so that an excessive surface pressure is not applied to the seal material (seal ring 9).
  • wear of the sliding material pressure receiving bush 7 is prevented by using the plate (corrugated plate 6) so that the sliding material (pressure receiving bush 7) is in contact with the rotating shaft.
  • Patent Document 3 a clean pressurized fluid (grease) is sprayed onto the sliding surfaces of the rotating part and the stationary part, so that the shaft can rotate stably even in a solution containing sludge (sludge). The idea that it can also prevent the wear of is described.
  • Patent Document 4 describes an idea of pressing with a pressurized fluid (seal fluid) so that the surface pressure of the rotating seal rings (first and second mechanical seals) is appropriately applied.
  • Patent Document 5 grease is injected into the chambers (inner and outer spaces 11a and 11b) provided on the left and right of the bearing (sealed bearing 3) even when the rotating shaft expands and contracts in the axial direction due to thermal expansion.
  • Patent Document 6 describes an idea for preventing wear of a seal ring as a seal material by injecting pressurized water (high pressure fluid) into a gap between a seal case and a seal ring and lubricating the water. Yes.
  • JP-A-2-283972 JP 49-1113061 (drawings, etc.) Japanese Utility Model Publication No. 43-8839 JP 2011-99532 A Japanese Patent Laid-Open No. 7-158643 JP 63-163073 A
  • the conventional technology has the following problems to be solved.
  • the contact surface pressure of the sliding material of the sealing material should be increased to avoid the movement of fluid inside and outside the container of the structure. (Pressure load), it is necessary to make a gap as a fluid movement path small.
  • the above-described prior art provides a structure in which the rotation shaft can rotate a plurality of rotations (two or more rotations), there are many cases where a plurality of rotations are not necessarily required depending on the rotating part of the apparatus.
  • the rudder of a ship, the rudder of a submarine, the connection part of the work arm of an underwater power shovel do not need to have a structure that can rotate a plurality of times, and is used within a finite rotation angle, for example, within a range of 180 degrees.
  • the present invention can be used even in a corrosive environment such as seawater where there is a pressure difference between the inside and outside of the container on which the rotation shaft is pivoted, and the shaft seal of the rotation angle variable container where the rotation torque does not become excessively large
  • the purpose is to provide a structure.
  • the shaft seal structure of the container according to claim 1 includes a rotating member that is rotatably supported by a container that isolates the inner space from the outer space, and one end portion fixed to the container integrally with the rotating member. The other end portion is fixed integrally, and a sealing member having a sealing property for sealing the inner space of the container from the outer space is provided.
  • the container shaft seal structure according to claim 2 is arranged with a cylindrical shape between a rotating member and a container to which the rotating member is rotatably attached, and one end of the cylindrical member is A sealing member that is integrally fixed to one of the rotating members that rotates and the other end of which is integrally fixed to the container, and that seals and seals the internal space of the container from the external space;
  • the rotating member and the container are supported by a sliding member that positions the central axis of the rotating member and a positioning member that positions each other in the direction of the central axis, and the sliding member is located inside the container.
  • the shaft seal structure of the container according to claim 11 is a cylindrical first seal having sealing properties and elasticity for sealing the inner space of the container from the outer space between the relatively rotating rotating member and the container.
  • a sealing member and a second sealing member are disposed, and the first sealing member has one end of the cylindrical shape fixed integrally with the rotating member and rotates together with the rotating member, and the other end is
  • the second seal member is fixed integrally with the container, and is disposed closer to the rotation axis of the rotating member in the radial direction than the first seal member, and the one end of the cylindrical shape
  • a rotating member fixed integrally with the rotating member and rotating with the rotating member; the other end is fixed integrally with the container; and the rotating member and the container are a sliding member for positioning the central axis of the rotating member; , Positioning in the direction of the central axis of each other
  • An air chamber is provided between the first and second sealing members and the container, and is maintained at a pressure between the pressure outside the container and the pressure inside the container. ing.
  • a shaft seal structure for a container with a variable rotation angle that can be used even in a corrosive environment such as seawater where there is a pressure difference between the inside and outside of the container in which the rotation shaft is pivoted, and the rotation torque does not become excessively large. realizable.
  • FIG. 2 is a perspective view of a cross-section of the truncated cone-shaped soft elastic body of Embodiment 1 cut along a center plane.
  • (a) is the perspective view of the cross section which cut
  • (b) is the cross section which cut the truncated cone-shaped soft elastic body of the other example 2 in the center plane
  • FIG. 10 is a cross-sectional view taken along the central cross section of the rotation shaft of the seal structure of Embodiment 5. . It is sectional drawing cut
  • FIG. 10 is a side view of a deep sea research ship having a watertight container seal structure according to a ninth embodiment.
  • Embodiments of the present invention will be described below with reference to the accompanying drawings.
  • FIG. 1 is a partially cutaway perspective view of the main part of the seal structure for a watertight container according to Embodiment 1 of the present invention.
  • the seal structure S of the watertight container according to the first embodiment is pivotally inserted through the watertight container 3 that seals the internal space P from the seawater (external space G) and the wall plate 3p of the watertight container 3 and has a finite angle.
  • a rotating shaft 1 that performs a rotational motion of less than 180 degrees.
  • the watertight container 3 is partially cut away.
  • the external space G of the watertight container 3 is, for example, deep sea, and the internal space P of the watertight container 3 is filled with air.
  • the internal space P of the watertight container 3 is a human work place.
  • a disc-shaped rotating member 2 having a center hole 2o through which the rotating shaft 1 is inserted is fixed to the rotating shaft 1 by welding or the like.
  • the rotary shaft 1 is disposed so as to penetrate from the seawater of the external space G to the internal space P of the watertight container 3.
  • the rotating shaft 1 is fixed to an inner ring of a positioning bearing 4 that determines the center position, and an outer ring of the bearing 4 is fixed to a support 5 fixed to a wall plate 3p of the watertight container 3. Thereby, the rotating shaft 1 is rotatable with respect to the watertight container 3.
  • the rotating shaft 1 rotates around the center line 1o of the rotation center.
  • a thrust bearing that can support a thrust load is used as the bearing 4.
  • the rotation center (center line 1o) of the rotating shaft 1 is fixed with respect to the watertight container 3 by fixing the bearing 4 fixed to the inside of the watertight container 3 to the inner ring.
  • the outer ring of the bearing 4 is fixed to the support 5 fixed to the watertight container 3, whereby the axial position of the rotary shaft 1 is positioned with respect to the watertight container 3.
  • the watertight container 3 is comprised with the metal etc. which have rust prevention property, as long as predetermined intensity
  • a fixing member 7 through which the rotary shaft 1 is inserted is fixed to the wall plate 3p of the watertight container 3 by bolting, welding or the like.
  • the fixing member 7 is provided with a center hole 7a, and is formed in a shape having a cylindrical portion 7e and a disc-shaped flange portion 7f formed at one end of the cylindrical portion 7e.
  • the fixing member 7 is formed of a rust-proof metal such as stainless steel, but the material is arbitrary as long as the material has rust-proof properties.
  • the fixing member 7 is fixed to the watertight container 3 with a bolt through welding or a sealant so that there is no movement of fluid inside and outside the watertight container 3.
  • the fixing member 7 is installed in the watertight container 3 so that the central axis of the central hole 7a of the fixing member 7 and the central axis of the rotating shaft 1 substantially coincide with each other.
  • FIG. 2 is a perspective view of a cross section obtained by cutting a frustoconical soft elastic body at the center plane.
  • a top 6p of a soft elastic body 6 (see FIG. 2) having a hollow frustoconical shape is fixed to the rotating shaft 1, and a bottom 6t of the soft elastic body 6 is fixed to a fixing member 7.
  • the soft elastic body 6 is made of rubber, and its thickness (thickness dimension) is determined so as not to be damaged by the pressure difference between the inside and outside of the watertight container 3.
  • the soft elastic body 6 is formed of rubber such as natural rubber, nitrile rubber, or silicone rubber.
  • the soft elastic body 6 may be made of a material other than rubber as long as it has water tightness (sealability) and elastic properties.
  • the soft elastic body 6 is vulcanized and bonded to the rotating shaft 1 and the fixed member 7 so that the fluids in the inner and outer spaces P and G of the watertight container 3 such as air and seawater do not leak.
  • Fixed As shown in FIG. 2, the frustoconical soft elastic body 6 centering on the center line 6o is embedded with fibers 8 (8a, 8b) that are continuous reinforcing fibers in the circumferential direction and the generatrix direction perpendicular thereto.
  • fibers 8 (8a, 8b) that are continuous reinforcing fibers in the circumferential direction and the generatrix direction perpendicular thereto.
  • Glass fiber, carbon fiber, silicon carbide fiber, organic fiber, metal wire, or the like is used as the type of fiber 8. Since the fiber 8 is intended to reinforce the soft elastic body 6, a fiber 8 having a tensile strength greater than that of the soft elastic body 6 is selected.
  • the radial load with respect to the center line 1 o of the rotating shaft 1 is shared by the fibers 8 a arranged in the circumferential direction, and the axial direction of the rotating shaft 1
  • the fiber 8b in the direction of the generatrix of the soft elastic body 6 shares the load.
  • the orientation of the fibers 8 (8a, 8b) can suppress resistance to torsional deformation in the rotational direction (arrow ⁇ 1, ⁇ 2 direction in FIG. 1) of the soft elastic body 6.
  • the rotation angle (rotation angles of arrows ⁇ 1 and ⁇ 2 in FIG. 1) can be increased by increasing the axial height of the soft elastic body 6.
  • the bearing 4 and the support 5 can share the load in the axial direction (in the direction of the center line 1o of the rotating shaft 1 in FIG. 1). It is possible to suppress a large axial tensile load. This produces an effect of increasing the allowable number of repetitions of the rotational movement of the rotating shaft 1. Accordingly, there is no movement of fluid across the inside and outside of the watertight container 3 even under a high seawater pressure environment, and the compact and long-life seal in which the rotary shaft 1 can perform a rotational motion of a finite rotational angle (rotational motion of arrows ⁇ 1 and ⁇ 2 in FIG. 1) Can provide structure.
  • the driving force of the rotating shaft 1 is determined by the torsional deformation force depending on the elastic coefficient (lateral elastic coefficient) of the soft elastic body 6, it can be small. Further, it can be retrofitted to a machine having an existing rotating part.
  • the rotation angle of the rotating shaft 1 can be arbitrarily adjusted by changing the dimension of the soft elastic body 6 in the direction of the center line 6o in FIG. For example, when the rotation angle of the rotary shaft 1 is small, the size of the soft elastic body 6 in the direction of the center line 6o in FIG. 2 is shortened, while when the rotation angle of the rotary shaft 1 is large, the soft elastic body 6 The dimension in the direction of the center line 6o in FIG.
  • the present invention can also be applied to a rotary drive unit of a machine used in various chemical environments and a rotary drive unit of a machine used in a vacuum environment such as space.
  • FIG. 3A is a perspective view of a cross section of the truncated cone-shaped soft elastic body of the other example 1 cut along the center plane
  • FIG. 3B shows the truncated cone-shaped soft elastic body of the other example 2. It is a perspective view of the section cut at the center plane.
  • the fibers 8a are arranged in the circumferential direction.
  • the fibers 8a1 are inclined with respect to the circumferential direction as shown in FIG.
  • the fibers 8a2 may be arranged in a wavy shape having a curvature along the circumferential direction. Thereby, it is possible to cope with an increase in the rotation angle of the rotary shaft 1 without increasing the dimension of the soft elastic body 6 in the direction of the center line 6o (see FIG. 2).
  • FIG. 4A is a perspective view of a fixing portion between the soft elastic body and the fixing member of the second embodiment
  • FIG. 4B is a vertical cross section of the fixing portion of the soft elastic body and the fixing member of the second embodiment.
  • FIG. 5 is a cross-sectional view taken along line AA in FIG.
  • the sealing structure of the watertight container according to the second embodiment is configured such that the soft elastic body 6 can be easily fixed by the fixing member 7 and the pressing member 9 in a deformed state within the elastic limit.
  • the bottom 6t at one end of the soft elastic body 6 has its deformation allowance s2 determined by the shape of the step 9a of the pressing member 9. Specifically, by inserting the bolt 10 through a hole (not shown) of the pressing member 9 and screwing the bolt 10 to the fixing member 7, the soft elastic body 6 is fixed to the fixing member 7 by compressing the deformation margin s 2.
  • the holding member 9 has an opening 9k in the center portion having the shape of a step 9a that maintains a certain distance so that the soft elastic body 6 is not excessively compressed and deformed when the soft elastic body 6 is sandwiched between the fixing members 7. It has a ring shape (see FIG. 4A).
  • the deformation allowance s2 of the soft elastic body 6 is a deformation amount that only requires deformation within the elastic limit even when the soft elastic body 6 repeatedly undergoes torsional deformation, and the fixing portion of the soft elastic body 6 with the fixing member 7 is fixed. The watertightness is maintained.
  • the step dimension s3 of the step 9a of the pressing member 9 is set to be within a range of 8% to 30% of the thickness (thickness dimension) t1 of the soft elastic body 6. If it is less than 8%, the elastic deformation at the time of fixing the pressing member 9 is insufficient and there is a risk of water leakage. On the other hand, if it exceeds 30%, the elastic deformation is too large, and the fatigue life is shortened. Is aged.
  • the soft elastic body 6 is stepped on the pressing member 9. No deformation more than that determined by the shape of 9a occurs. That is, the pressing member 9 has an effect as a stopper for deformation that does not lead to compression deformation (crushing) that destroys the soft elastic body 6.
  • the amount of compressive deformation at the end of the soft elastic body 6 within the range of 8% to 30% of the thickness (thickness dimension) t1, an appropriate sealing effect can be continuously maintained, and The fatigue life is prolonged and the reliability of the soft elastic body 6 is improved.
  • FIG. 5 is a cross-sectional view taken along the center line of the rotation shaft of the seal structure of the third embodiment.
  • the rotation shaft 1 is pivoted through the opening 3 k of the watertight container 3.
  • a fixing member 7 in which a cylindrical portion 7e having a central hole 7o through which the rotary shaft 1 is inserted and a disc-shaped flange portion 7f is formed is fixed.
  • a rotating member 2 that is inward of the fixing member 7 is fixed to the rotating shaft 1 on the rotating shaft 1.
  • the rotating member 2 has a bottomed cylindrical shape having a center hole 2o through which the rotating shaft 1 is inserted.
  • the truncated cone-shaped soft elastic body 6 has a top portion 6 p fixed to the cylindrical portion 7 e of the fixing member 7 and a bottom portion 6 t fixed to the tip portion 2 s of the rotating member 2.
  • a thrust bearing 11 is installed between the rotating member 2 and the fixed member 7, and the thrust bearing 11 rotatably supports the rotating shaft 1 on the watertight container 3 and thrust load in the direction of the rotating shaft 1 (FIG. 5). In the direction of arrow ⁇ 1).
  • a plurality of tetrafluoroethylene sheets 12 (12a, 12b) having a low friction coefficient (static / dynamic friction coefficient) are inserted between the soft elastic body 6 and the rotating member 2.
  • the sheets 12 (12a, 12b) are preferably formed in a predetermined shape such as a truncated cone shape. Thereby, even when the rotating shaft 1 and the rotating member 2 perform the rotational movement, the sheet 12 (12a, 12b) maintains the same shape, and the rotational movement of the rotating member 2 is performed by the soft elastic body 6 and the sheet 12. , Can be inhibited. Further, the friction force acting between the soft elastic body 6 and the rotating member 2 is reduced by the sheet 12, the soft elastic body 6 receives pressure from the fluid in the external space G, and the soft elastic body 6 is inside the rotating member 2. It sticks to the peripheral surface and suppresses the hindrance of the rotational motion of the rotary shaft 1 (see arrow ⁇ 3 in FIG. 5).
  • the soft elastic body 6 sticks to the inner peripheral surface of the rotating member 2 via the tetrafluoroethylene sheet 12 at seawater pressure.
  • a sheet 12 made of tetrafluoroethylene having a low friction coefficient exists between the soft elastic body 6 and the inner peripheral surface of the rotary member 2, so that a high surface pressure is obtained.
  • the frictional force between the soft elastic body 6 and the rotary member 2 is reduced, and the rotary shaft 1 can be rotated at a low torque.
  • the sheet 12 having a low friction coefficient is interposed, so that the rotary shaft 1 can be rotated with a small torque.
  • the thrust bearing 11 is present in the air chamber on the watertight container 3 side, the structure is compact. In addition, there is an effect that seawater is not immersed in the thrust bearing 11 and malfunctions due to corrosion of the thrust bearing 11 and adhesion of dust hardly occur.
  • tetrafluoroethylene is exemplified as the material of the sheet 12, but other materials may be selected as long as the static / dynamic friction coefficient is low.
  • the case where there are two sheets 12 is illustrated, but the number of sheets 12 may be one or three or more. If a plurality of sheets 12 are used, the effect of reducing the coefficient of friction between the soft elastic body 6 and the rotating member 2 is large. Therefore, a plurality of sheets 12 are preferable. However, if two sheets 12 are used, the configuration is simple and the necessary function can be achieved. Most desirable.
  • FIG. 6 is a perspective view in which a main part of a watertight container showing the seal structure of Embodiment 4 is cut away.
  • Embodiment 4 demonstrates the other example of the seal structure of a watertight container.
  • a disc-shaped rotating member 2 in which an opening 2 o through which the rotating shaft 1 is inserted is fixed to the rotating shaft 1.
  • a disk-shaped fixing member 7 having a center hole 7k is fixed to the watertight container 3 with a bolt (not shown) via welding or a sealing material, and the internal space P and the external space G of the watertight container 3 are It is fixed so that there is no fluid movement between the two.
  • the fixing member 7 is installed in the watertight container 3 so that the central axis of the central hole 7k and the central axis of the rotating shaft 1 substantially coincide with each other.
  • the rotating shaft 1 penetrates from the outer space G to the inner space P of the watertight container 3 and is fixed to the inner ring of the positioning bearing 4 that determines the center of the rotating shaft 1.
  • the outer ring of the bearing 4 is fixed to a support 5 fixed to the watertight container 3. Thereby, the rotating shaft 1 is rotatable with respect to the watertight container 3.
  • the rotation shaft 1 is positioned at the center of rotation in the watertight container 3 by the bearing 4, and is positioned by the bearing 4 and the support 5 in the axial direction.
  • One end surface 13a in the axial direction of a cylindrical soft elastic body 13 is fixed to the rotating member 2 fixed to the rotating shaft 1, and a metal disc 14 is fixed to the other end surface 13b.
  • the metal disk 14 is fixed to the one end face 13a of the soft elastic body 13 below.
  • the soft elastic body 13 and the metal disk 14 are fixed to each other and laminated.
  • the cylindrical soft elastic body 13 has a central hole 13k having a diameter larger than the outer diameter of the rotary shaft 1 extending in the axial direction, and the rotary shaft 1 is inserted through the hole 13k.
  • a hole having a shape similar to the hole 13k is also provided in the metal disk 14 in the axial direction, and the rotary shaft 1 is inserted through the hole.
  • a combination of the cylindrical soft elastic body 13 and the metal disk 14 is fixed to each other and stacked in the axial direction of the multi-stage rotating shaft 1.
  • the lowermost soft elastic body 13 is fixed to a fixing member 7 fixed to the watertight container 3.
  • the soft elastic body 13 is made of rubber or the like as in the first embodiment. In the radial direction of the soft elastic body 13, the pressure of the fluid in the external space G is applied from the outside, while the pressure of the fluid in the internal space P is applied from the inside. Is determined so as not to be broken by the pressure difference between the inside and outside of the watertight container 3. In addition, since the metal disk 14 is fixed to the soft elastic body 13, the pressure resistance increases.
  • the cylindrical soft elastic body 13 and the rotating member 2 or the fixed member 7 are vulcanized and bonded so that there is no leakage of fluid inside and outside the watertight container 3, such as seawater in the external space G or air in the internal space P.
  • the rotation angle of the rotation shaft 1 (see arrows ⁇ 4 and ⁇ 5 in FIG. 6) is finite, but when the rotation angle of the rotation shaft 1 is large, the axial dimensions of the cylindrical soft elastic body 13 and the metal disk 14 are large.
  • s4 that is, by increasing the number of layers of the soft elastic body 13 and the metal disk 14, the torsional deformation of the soft elastic body 13 can be reduced.
  • the soft elastic body 13 is supported by the metal disk 14 even if the pressure in the external space G increases, so that the cylindrical shape is reduced. It is suppressed that the soft elastic body 13 is crushed or crushed in the radial direction.
  • the cylindrical soft elastic body 13 and the metal disk 14 are laminated, it is possible to cope with the magnitude of the rotation angle of the rotary shaft 1 by increasing or decreasing the number of lamination. Further, by adjusting the number of layers and the outer diameter and radial thickness of the soft elastic body 13 and the metal disk 14, it is possible to cope with an increase in the fluid pressure in the external space G.
  • the cylindrical soft elastic body 13 and the metal disk 14 have a simple configuration, and can easily cope with a change in the pressure difference of the fluid between the external space G and the internal space P.
  • FIG. 7 is a cross-sectional view taken along the center cross section of the rotation shaft of the seal structure of the fifth embodiment.
  • a disc-shaped rotating member 2 having a central hole 2o through which the rotating shaft 1 is inserted is fixed to the rotating shaft 1.
  • a fixed member 7 having a central hole 7o through which the rotary shaft 1 is inserted and having a cylindrical portion 7a and a disc portion 7b formed is fixed to the watertight container 3.
  • the disc-shaped rotating member 2 and the disc portion 7b of the fixing member 7 include a cylindrical soft elastic body 13 having a larger inner diameter than the cylindrical portion 7a and the thrust bearing 11 of the fixing member 7, and a metal circle.
  • a soft elastic laminate 13S composed of the plate 14 is fixed.
  • the rotating member 2, the thrust bearing 11, and the fixed member 7 are positioned in the axial direction and the radial direction of the rotating shaft 1 while receiving the axial load of the rotating shaft 1.
  • the soft elastic laminate 13S is rotated smoothly (see arrows ⁇ 4 and ⁇ 5 in FIG. 7) by torsional deformation due to the low lateral elastic modulus of the soft elastic body 13.
  • the thrust bearing 11 for positioning the rotary shaft 1 and the cylindrical portion 7a of the fixed member 7 are included in the seal structure, unlike the fourth embodiment (see FIG. 6). It becomes. Further, since the thrust bearing 11 is present in the air chamber on the watertight container 3 side, seawater is not immersed in the thrust bearing 11, so that the thrust bearing 11 is prevented from corroding and entering the dust, and the operation is caused by the corrosion and dust adhering. There is an effect that it is difficult for defects to occur.
  • FIG. 8 is a cross-sectional view taken along the central cross section of the rotation shaft of the watertight container seal structure of the sixth embodiment.
  • Embodiment 6 is an example of the seal structure of the watertight container 3 corresponding to the case where the pressure difference between the external space G and the internal space P of the watertight container 3 is large.
  • a rotating member 2 having a central hole 2o through which the rotating shaft 1 is inserted is fixed to the rotating shaft 1 by welding or the like.
  • the rotating member 2 includes a disc portion 2e having a center hole 2o and a cylindrical partition wall 15.
  • a fixing member 7 is fixed to the watertight container 3 in the vicinity of the opening 3 k formed in the watertight container 3.
  • the fixing member 7 includes a disc portion 7e in which the center hole 7o is formed, a first cylindrical portion 7f in which the center hole 7o is formed on the inner peripheral surface, and a first portion provided outside the first cylindrical portion 7f. 2 cylindrical portions 7g are formed.
  • the rotary shaft 1 is pivoted from the external space G to the internal space P of the watertight container 3 through the opening 3k of the watertight container 3 and the center hole 7o of the fixing member 7 fixed to the watertight container 3. .
  • the one ring 11a of the thrust bearing 11A is fixed to the tip of the first cylindrical portion 7f of the fixing member 7 fixed to the watertight container 3, while the disk portion 2e of the rotating member 2 fixed to the rotating shaft 1 is fixed.
  • the other wheel 11b of the thrust bearing 11A is fixed to the one surface of the thrust bearing 11A.
  • a second thrust bearing 11 ⁇ / b> B is provided at the tip 15 s of the partition wall 15 of the rotating member 2 between the disk portion 7 e of the fixed member 7.
  • the rotary shaft 1 is configured to be rotatable with respect to the fixed member 7 by the first and second thrust bearings 11A and 11B.
  • the rotary shaft 1 is positioned in the axial direction and in the radial direction by the first and second thrust bearings 11A and 11B and the fixing member 7.
  • two hollow frustoconical first and second soft elastic bodies 16 and 17 are arranged.
  • the frustoconical first soft elastic body 16 is arranged at a position far from the rotary shaft 1 in the radial direction, and the second soft elastic body 17 is closer to the rotary shaft 1 than the first soft elastic body 16. Placed in.
  • the first soft elastic body 16 having a truncated cone shape far from the rotation shaft 1 has one end face (end portion) at the tip end portion 7g1 of the second cylindrical portion 7g of the fixing member 7 and the central axis of the rotation shaft 1.
  • the other end face (end portion) is fixed so as to substantially coincide with the center of rotation, and the other end face (end portion) is fixed to the front end portion 15s of the partition wall 15 of the rotating member 2, and the center axis thereof is fixed so as to substantially coincide with the rotation center of the rotating shaft 1.
  • the second soft elastic body 17 having a truncated cone shape close to the rotating shaft 1 has one end face (end portion) at the tip 15 s of the partition wall 15 of the rotating member 2 and its central axis approximately at the rotational center of the rotating shaft 1.
  • the other end face (end portion) is fixed to the distal end portion 7f1 of the first cylindrical portion 7f of the fixing member 7 so that the central axis thereof substantially coincides with the rotation center of the rotary shaft 1. .
  • a hole 18 communicating from the watertight container 3 is a circle of the fixing member 7.
  • the fluid in the bag-like pressure adjusting bag 19 communicates with the hole 18. Nitrogen gas, compressed air, oil or the like is used as the fluid.
  • the pressure adjustment bag 19 is disposed inside a box-shaped pressure vessel 20 having a sealed structure, and for example, nitrogen gas is filled between the inner surface of the pressure vessel 20 and the outer surface of the pressure adjustment bag 19.
  • the gas pressure is arbitrarily changed by a pressure adjusting device 21 using a gas cylinder or a piston mechanism.
  • the command pressure of the gas pressure is determined by the measured value of the pressure sensor 22 that measures the external pressure of the watertight container 3 (pressure in the external space G).
  • the pressure by the pressure adjustment bag 19 is controlled to be an intermediate pressure between the external pressure and the internal pressure of the watertight container 3 measured by the pressure sensor 22, and the pressure of the air chamber k 1 is an intermediate pressure between the external pressure and the internal pressure. It becomes.
  • the first and second soft elastic bodies 16 and 17 are made of rubber alone or fiber reinforced rubber as shown in FIGS. 2 and 3, and the thickness (thickness dimension) of the water-tight container 3
  • the pressure difference between the internal space P and the external space G is determined so as not to be destroyed (collapsed).
  • the first and second soft elastic bodies 16, 17 are vulcanized and bonded to the rotating member 2 and the fixed member 7, and a fluid such as seawater or air leaks between the internal space P and the external space G of the watertight container 3. There is no close contact.
  • the external pressure of the watertight container 3 (the pressure of the external space G) is extremely high.
  • the thickness (thickness dimension) becomes large, and it is possible to cope with the case where shear deformation (torsional deformation) is difficult.
  • the air chamber k1 maintained at an intermediate pressure between the external pressure and the internal pressure of the watertight container 3 is provided between the first and second soft elastic bodies 16 and 17 and the watertight container 3,
  • the pressure acting on the first and second soft elastic bodies 16 and 17 decreases. Therefore, the thickness (thickness dimension) of the first and second soft elastic bodies 16 and 17 can be reduced, and shear deformation (torsional deformation) can be easily performed.
  • the pressure acting on the soft elastic body can be increased by providing a larger number of soft elastic bodies according to the external pressure. Can be reduced to any value.
  • the pressure of the air chamber k1 is exemplified as an intermediate pressure between the external pressure and the internal pressure. However, the pressure of the air chamber k1 is between the internal space P and the external space G. Other pressures may be selected as long as they are pressures.
  • FIG. 9 is a perspective view of the watertight container seal structure according to the seventh embodiment, with the main part cut away.
  • a cylindrical rotating member 2 having a center hole 2 o through which the rotating shaft 1 is inserted is fixed to the rotating shaft 1.
  • the rotating shaft 1 penetrates from the outer space G to the inner space P of the watertight container 3 and is pivotally mounted on the watertight container 3 so as to perform an actuator (not shown) to perform a rotational motion (see arrows ⁇ 6 and ⁇ 7 in FIG. 9). Z)).
  • a fixing member 7 Fixed to the watertight container 3 is a fixing member 7 in which a central hole 7o into which the rotary shaft 1 is fitted is formed.
  • the fixing member 7 has a disc-shaped flange portion 7f and a cylindrical portion 7e in which a center hole 7o is formed.
  • the fixing member 7 is fixed to the watertight container 3 with a bolt through welding or a sealant so that the fluid inside and outside the watertight container 3 does not move.
  • the fixing member 7 is installed in the watertight container 3 so that the central axis of the central hole 7o and the central axis of the rotary shaft 1 substantially coincide.
  • a cylindrical spacer 27 having a desired distance between the two is provided between the rotating member 2 and the fixed member 7, a cylindrical spacer 27 having a desired distance between the two is provided.
  • a member having a low coefficient of friction is selected so that the rotating member 2 and the fixed member 7 can smoothly rotate with each other so that excessive resistance torque does not act on the rotating shaft 1.
  • the spacer 27 is made of, for example, a thrust bearing or a tetrafluoroethylene material.
  • the spacer 27 may use other members.
  • the waterproof covering 28 is attached so as to cover the outer surfaces of the rotating member 2, the fixing member 7, and the spacer 27.
  • FIG. 10 is a perspective view showing an example of the waterproof covering according to the seventh embodiment.
  • FIG. 10 shows a case where two portions 28g1 and 28g2 where the outer diameter of the waterproof covering 28 is large are provided.
  • two portions 28g1 and 28g2 having large outer diameters are provided, and a plurality of large pleat-shaped irregularities 28o are provided in a direction oblique to the axial direction of the waterproof cover 28. ing.
  • the rotary shaft 1 rotates (see arrows ⁇ 6 and ⁇ 7 in FIG. 9)
  • the fold-like unevenness 28o extends, and the portions 28g1 and 28g2 whose outer diameters are increased become thinner, so that the waterproof coating is provided.
  • the body 28 can be followed by deformation without becoming resistance to the rotational movement of the rotary shaft 1 (see arrows ⁇ 6 and ⁇ 7 in FIG. 9).
  • the waterproof covering 28 is made of rubber or a polymer material-based resin sheet, and is made of a material that does not transmit liquid such as seawater.
  • the waterproof covering 28 and the outer peripheral surface of the rotating member 2 or the fixing member 7 are bonded with an adhesive so that liquid (fluid) does not enter. In this way, close contact is made so that there is no leakage of fluid inside and outside the watertight container 3, such as seawater in the external space G or air in the internal space P.
  • a surface pressure from the outer peripheral surface of the waterproof covering 28 to the rotating member 2 or the fixing member 7 may be applied by a band 29 in order to enhance the waterproof effect.
  • the waterproof covering 28 has a portion 28 g in which the diameter near the center in the height direction is larger than the outer diameter of the rotating member 2 and the fixed member 7.
  • the portion 28g having a large outer diameter has a sufficient length in the circumferential direction when the waterproof covering 28 is made of a non-elastic material, and the rotary shaft 1 rotates (see FIG. 9). (See arrows [alpha] 6 and [alpha] 7), the rotation member 2, the spacer 27, and the fixing member 7 become thinner along the outer surface, and the rotational movement is not hindered.
  • the waterproof covering 28 is made of an elastic material
  • the rotary shaft 1 rotates (see arrows ⁇ 6 and ⁇ 7 in FIG. 9)
  • the torsional deformation determined by the lateral elastic modulus is performed within the elastic limit.
  • a low friction sheet 30 formed in a cylindrical shape is provided inside the portion 28g having a large outer diameter in order to reduce the frictional force between the waterproof covering 28 and the rotating member 2 or the fixing member 7. , One or more are installed.
  • FIG. 11 shows a cylinder made of the low friction sheet 30.
  • the material of the low friction sheet 30 is made of a cloth woven with tetrafluoroethylene or organic fibers.
  • organic fibers include polybenzimidazole, polyparaphenylene benzobisoxazole, aromatic polyamide, polyarylate, and fibers made of aromatic polyester, but other fibers may be used.
  • the portions 28g, 28g1, and 28g2 in which the outer diameter of the waterproof covering 2 is large have a sufficient circumferential length. Or torsional deformation, and the amount of expansion or shear deformation is within an allowable range. Therefore, the rotating shaft 1 can be repeatedly rotated with little resistance (see arrows ⁇ 6 and ⁇ 7 in FIG. 9) without breaking the waterproof covering 28.
  • the waterproof covering 28 is expected to adhere to the outer periphery of the rotating member 2, the fixing member 7, and the spacer 27 with a high surface pressure.
  • the low friction sheet 30 is sandwiched between them, the friction coefficient between the inner surface of the waterproof covering 28 and the low friction sheet 30 and the low friction sheet 30 and the rotation member 2, the fixing member 7, and the spacer 27 Since the friction coefficient between them is kept low, the rotary shaft 1 has the effect of being able to rotate with a low torque.
  • the small elastic deformation of the waterproof covering 28 produces an effect of extending the fatigue life with repeated use. Further, by providing the waterproof covering 28 with portions 28g, 28g1, 28g2 having a large outer diameter and / or a plurality of large pleated irregularities 28o, a material having no elastic properties, for example, cloth-like fibers, A resin material that is thinly molded can also be used.
  • the outer diameter is Either a large portion or a plurality of large pleated irregularities may be formed.
  • FIG. 12 is a side view of a ship having the seal structure of the watertight container according to the eighth embodiment.
  • Embodiment 8 demonstrates the example of the ship F using the seal structure of a watertight container.
  • the seal structures of the first to seventh embodiments are applied to the shaft seal portion 23s of the rudder 23 that determines the traveling direction of the ship F.
  • the rudder 23 does not need to perform a plurality of rotations, for example, a rotation larger than 360 °, and is a structure having a rotation axis with a rotation angle within a finite angle range, for example, within 90 °.
  • the sealing performance of the shaft seal portion 23s of the rudder 23 can be maintained for a long time without being affected by the environment such as fresh water or seawater, and the rotational torque of the rudder 23 can be reduced with power.
  • FIG. 13 is a side view of a deep-sea research ship incorporating the seal structure of the watertight container of the ninth embodiment.
  • the seal structures of the first to seventh embodiments are applied to the shaft seal portion 24s of the sub rudder 24, the shaft seal portion 25s of the horizontal rudder 25, and the shaft seal portion 26s of the vertical rudder 26 that cause the submarine W to dive.
  • These rudders 24, 25, and 26 do not need to make a plurality of rotations, and are structures having a rotation axis with a rotation angle within a finite angle range, for example, within 180 degrees.
  • the sealability of the shaft seal portions 24s, 25s, and 26s of each rudder is maintained for a long period of time even in an environment where high water pressure during submergence works without being affected by the environment such as fresh water and seawater. It is. Moreover, the rotational torque of the rudder 24, 25, 26 can be small.
  • the sheet 12 is disposed between the rotating member 2 fixed to the rotating shaft 1 and the soft elastic body 6 (see FIG. 5) is illustrated.
  • the sheet 12 may be watertight. You may arrange

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Sealing Devices (AREA)
PCT/JP2012/054696 2012-02-27 2012-02-27 Structure d'étanchéité d'axe pour réceptacle Ceased WO2013128535A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107187099A (zh) * 2017-07-18 2017-09-22 中国工程物理研究院化工材料研究所 用于等静压成型工艺柔性模具进料口快速密封方法和装置
EP3252327A1 (fr) * 2016-06-01 2017-12-06 The Boeing Company Ensembles de palier de butée compacts, assemblages mécaniques comprenant des ensembles de palier de butée compacts et procédés de fourniture d'un mouvement de rotation limité dans un ensemble de palier de butée compact

Citations (3)

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Publication number Priority date Publication date Assignee Title
JP2009057087A (ja) * 2007-08-31 2009-03-19 Mitsubishi Heavy Industries Food & Packaging Machinery Co Ltd ロータリ充填機の充填バルブ自動洗浄装置
JP2011089797A (ja) * 2009-10-20 2011-05-06 Olympus Corp ロータリーエンコーダ及びそれを用いた医療用マニピュレータ
JP2011252519A (ja) * 2010-06-01 2011-12-15 Jtekt Corp ボールジョイント用ダストカバー

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009057087A (ja) * 2007-08-31 2009-03-19 Mitsubishi Heavy Industries Food & Packaging Machinery Co Ltd ロータリ充填機の充填バルブ自動洗浄装置
JP2011089797A (ja) * 2009-10-20 2011-05-06 Olympus Corp ロータリーエンコーダ及びそれを用いた医療用マニピュレータ
JP2011252519A (ja) * 2010-06-01 2011-12-15 Jtekt Corp ボールジョイント用ダストカバー

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3252327A1 (fr) * 2016-06-01 2017-12-06 The Boeing Company Ensembles de palier de butée compacts, assemblages mécaniques comprenant des ensembles de palier de butée compacts et procédés de fourniture d'un mouvement de rotation limité dans un ensemble de palier de butée compact
US10344798B2 (en) 2016-06-01 2019-07-09 The Boeing Company Compact thrust bearing assemblies, mechanical assemblies including compact thrust bearing assemblies, and methods of providing limited rotational motion in a compact thrust bearing assembly
CN107187099A (zh) * 2017-07-18 2017-09-22 中国工程物理研究院化工材料研究所 用于等静压成型工艺柔性模具进料口快速密封方法和装置

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