Mechanical seal

Abstract

To provide a mechanical seal which can stably achieve a vibration control function.SOLUTION: A vibration control member 11 has a support surface part 112 fixed to a stationary side element Q or a rotary side element R from an axial direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a mechanical seal, for example, a mechanical seal for sealing a rotating shaft. [Background technology]

[0002] Mechanical seals are used by being installed between the housing of a fluid equipment and a rotating shaft that passes through the housing. Specifically, mechanical seals have the function of preventing leakage of the sealed fluid by using the biasing force of a biasing means to bring the sliding surfaces of a stationary seal ring attached to the housing into sliding contact with the sliding surface of a rotating seal ring attached to the rotating shaft.

[0003] Some of these mechanical seals are known to be equipped with vibration-damping members to prevent squealing, which occurs when one of the stationary and rotating seal rings, which are held in a cantilevered position, slides radially relative to the other.

[0004] For example, a mechanical seal with a vibration-damping member as shown in Patent Document 1 includes a stationary seal ring fixed to a housing, a rotary seal ring fixed to a rotary shaft via a biasing means, and a vibration-damping member fixed to the rotary shaft. One end of the biasing means is held between a clamp fitted onto the rotary shaft. The other end of the biasing means is held by a retaining member fitted onto the rotary seal ring. The vibration-damping member is composed of four claws cantilevered by the clamp and an O-ring placed between each claw and the retaining member.

[0005] This allows the O-ring to elastically deform when the cantilevered rotating seal ring attempts to move relative to the O-ring in the precession or radial direction. This allows the vibration-damping member to prevent excessive movement of the rotating seal ring and continue to hold the axis of the rotating seal ring in approximately the same position. As a result, the vibration-damping member can suppress squealing when the mechanical seal is in use. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2024-33685 A (pages 6 and 7, Figure 2) Summary of the Invention [Problem to be solved by the invention]

[0007] In the mechanical seal of Patent Document 1, the claws are fixed radially to a clamp fixed to a rotating shaft with bolts, preventing the claws from moving axially. However, because the claws are fixed to the outer surface of the clamp, manufacturing tolerances and other factors can cause interference between the inner surface of the claws and the outer surface of the clamp, resulting in tilting or distortion of the claws and potentially preventing the vibration-damping function of the claws from functioning reliably. Furthermore, when the claws are fixed radially, there is a risk that the claws and the clamps may become misaligned in the axial direction.

[0008] The present invention has been made in view of these problems, and has as its object to provide a mechanical seal that can stably exhibit vibration damping function. [Means for solving the problem]

[0009] In order to solve the above problems, the mechanical seal of the present invention comprises: a pair of seal rings fixed to the stationary element and the rotating element; a biasing means for biasing one of the pair of seal rings toward the other; a vibration-damping member having a vibration-damping portion disposed on an outer diameter side of the one seal ring or a retaining member that holds the seal ring; an elastic member disposed between the one seal ring or the retaining member and the vibration damping portion, The vibration-damping member has a support surface portion that is axially fixed to the stationary-side element or the rotating-side element. With this, the support surface portion of the vibration-damping member is fixed axially to the stationary element or the rotating element, thereby preventing tilting or distortion of the vibration-damping portion due to interference with one of the seal rings or retaining members, and allowing the vibration-damping function to be stably exerted.

[0010] The vibration-damping portion may have a shape that follows the circumferential direction of the stationary-side element or the rotating-side element, and the support surface portion may be integrally provided at one end of the vibration-damping portion. This allows the vibration-damping portion to maintain a shape that follows the circumferential direction, thereby enabling the vibration-damping function to be stably exerted.

[0011] The support surface portion may be annular. According to this, since the support surface portion is annular, the vibration-damping portion is less likely to deform.

[0012] The vibration damping portion may be cylindrical. This allows the vibration-damping portion to have an integral structure, which increases the strength of the vibration-damping portion and makes it less likely to deform.

[0013] The vibration damping portion may be formed with a through hole that penetrates in the radial direction. With this, when the vibration-damping member is attached, the state of the elastic member can be confirmed from the outside through the through hole.

[0014] The elastic member may be annular, and the holding member may be provided with an annular groove in which the elastic member is disposed. According to this, the elastic member is accommodated in the annular groove of the holding member, and therefore the elastic member is prevented from falling off the holding member when the vibration damping member is attached.

[0015] The inner edge of the vibration-damping portion on the tip side may be a tapered surface that widens toward the tip. This prevents the elastic member from being damaged when the vibration-damping member is attached.

[0016] The inner edge of the vibration-damping portion on the tip side may be a curved surface that is convex toward the inner diameter side. This prevents the elastic member from being damaged when the vibration-damping member is attached.

[0017] In order to solve the above problems, the mechanical seal of the present invention comprises: a pair of seal rings fixed to the stationary element and the rotating element; a biasing means for biasing one of the pair of seal rings toward the other; a vibration-damping member having a vibration-damping portion disposed on an outer diameter side of the one seal ring or a retaining member that holds the seal ring; an elastic member disposed between the one seal ring or the retaining member and the vibration damping portion, The vibration-damping member has a restricting portion that restricts axial movement of the stationary element or the rotating element. According to this, when the vibration-damping member is fixed to the stationary element or the rotating element, the regulating portion regulates the relative axial movement between the vibration-damping member and either the stationary element or the rotating element, thereby enabling the vibration-damping function to be stably exerted. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a cross-sectional view showing a mechanical seal according to a first embodiment of the present invention. [Figure 2] 1 is a view of the mechanical seal of the first embodiment as seen from the axial direction. [Figure 3] 1A is an enlarged view of a main part of the vibration damping member of Example 1 as seen from the axial direction, FIG. 1B is a cross-sectional view taken along line AA in FIG. 1A, and FIG. 1C is a cross-sectional view taken along line BB in FIG. [Figure 4] 1A is a schematic diagram showing a state before the vibration-damping member is assembled to the rotating element, and FIG. 1B is a schematic diagram showing a state after the vibration-damping member is assembled to the rotating element. [Figure 5] 10(a) to 10(c) are diagrams showing modified examples of the tip shape of the vibration-damping member. [Figure 6] FIG. 10 is a perspective view showing a vibration damping member according to a second embodiment of the present invention. [Figure 7] FIG. 10 is a view of a vibration damping member according to a third embodiment of the present invention, as viewed from the axial direction. [Figure 8] FIG. 10 is a view of a mechanical seal according to a fourth embodiment of the present invention as viewed from the axial direction. [Figure 9] FIG. 10 is a perspective view showing a vibration damping member according to a fourth embodiment. [Figure 10] FIG. 10 is a cross-sectional view showing a mechanical seal according to a fifth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A mechanical seal according to the present invention will be described below with reference to the following examples. [Example]

[0020] A mechanical seal according to a first embodiment will be described with reference to Fig. 1 to Fig. 4. In the following description, the left side of Fig. 1 will be referred to as the left side, and the right side of Fig. 1 will be referred to as the right side. Fig. 1 shows a cross-section taken along the 3 o'clock position and a position between 10 o'clock and 11 o'clock in Fig. 2.

[0021] As shown in Figure 1, the mechanical seal 1 of this embodiment is used in the field of shaft sealing for pumps, mixers, etc. The mechanical seal 1 is attached to provide a seal between a housing 2 and a rotating shaft 3.

[0022] The mechanical seal 1 is mainly composed of a stationary element Q, a rotating element R, and a vibration damping mechanism 10.

[0023] The stationary element Q includes a case 4. The rotating element R includes a bellows 6, a clamp 7, a retainer 8 as a holding member, a coil spring 80 as a biasing means, and a set ring 9. A vibration damping mechanism 10 is provided on the rotating element R side.

[0024] A stationary seal ring 5 is disposed between the housing 2 and a case 4 fixed to the housing 2 in a non-rotating state and in a state in which its movement in the axial direction is restricted.

[0025] The bellows 6 is formed in a substantially cylindrical shape and includes, from the right side, a bellows portion 61 and a base end portion 62. The right end of the bellows portion 61 is adhesively fixed to the rotary seal ring 60.

[0026] The rotary seal ring 60 slides relative to the stationary seal ring 5. The stationary seal ring 5 and the rotary seal ring 60 are ceramic molded products that are low-friction members.

[0027] The stationary seal ring 5 and the rotating seal ring 60 are not limited to being made of ceramics, but may be made of SiC (hard material) and SiC (hard material) and a combination of SiC and carbon (soft material). Any sliding material used for mechanical seals can be used. Examples of SiC include sintered bodies using boron, aluminum, carbon, or other sintering aids, as well as materials consisting of two or more phases with different components and compositions, such as SiC with dispersed graphite particles, reaction-sintered SiC consisting of SiC and Si, SiC-TiC, and SiC-TiN. Examples of carbon include a mixture of carbonaceous and graphite materials, resin-molded carbon, and sintered carbon. In addition to the above sliding materials, metal materials, resin materials, surface-modified materials (coating materials), and composite materials can also be used.

[0028] The bellows portion 61 is formed in a bellows shape and is configured to be expandable and contractible in the axial direction. The base end portion 62 is configured in a cylindrical shape. The inner diameter of the base end portion 62 is approximately the same as the outer diameter of the rotating shaft 3. The bellows portion 61 and the base end portion 62 are molded metal or resin parts.

[0029] The bellows portion 61 may be fixed by any known fixing method other than adhesion, such as welding, shrink fitting, etc. The bellows portion 61 and the rotary seal ring 60 may be integrally molded from the same material, and the configuration of the bellows 6 may be changed as appropriate.

[0030] As shown in Figure 2, the clamp 7 is composed of a pair of split clamp pieces 70 and two bolts 71. The split clamp pieces 70 are formed in a semicircular arc shape. In Figure 2, the set ring 9 is shaded to clearly show the split clamp pieces 70.

[0031] 1 and 2, the clamp 7 has a pair of split clamp pieces 70 fitted onto the base end 62 of the bellows 6 and fastened together with two bolts 71, thereby crimping the base end 62 to the rotating shaft 3 and fixing it in a sealed state. Note that, although not shown in detail, by fastening the split clamp pieces 70 together, the clamp 7 is fixed to the set ring 9 in a state where its relative movement is restricted.

[0032] Furthermore, the left surface 7a of the clamp 7 has four equally spaced female screw holes 7b recessed toward the shaft and open to the left. The left surface 7a of the clamp 7 is perpendicular to the axial direction. In other words, the left surface 7a of the clamp 7 forms a surface that intersects with the axial direction of the rotating element R.

[0033] An annular adapter 72 that constitutes the rotating element R is fixed to the clamp 7. Preferably, the adapter 72 is made up of multiple pieces that are divided in the circumferential direction. A rotation prevention pin 73 is also fixed to the clamp 7.

[0034] The retainer 8 is formed in a cylindrical shape with a step on the inner diameter side. The outer peripheral surface 8a of the retainer 8 is provided approximately concentrically with the outer peripheral surface of the clamp 7. An annular groove 81 that opens in the outer diameter direction is formed in the outer peripheral surface 8a of the retainer 8. An O-ring 15, which will be described later, is accommodated in the annular groove 81.

[0035] The inner diameter side of the right end of the retainer 8 is expanded so that the rotary seal ring 60 can be fitted inside. Furthermore, relative rotation between the retainer 8 and the rotary seal ring 60 is restricted by anti-rotation means. In this embodiment, the right end of the retainer 8 is formed with a notch that penetrates radially and opens to the right in the axial direction, and into this notch is inserted the head of an anti-rotation pin that is fixed to the rotary seal ring 60 and protrudes outward (not shown). Note that the configuration of the anti-rotation means may be modified as appropriate.

[0036] A plurality of recesses 82 that are recessed in the axial direction and open toward the left are formed on the left end surface of the retainer 8. One end of the coil spring 80 is inserted into the recesses 82, and the coil spring 80 is disposed between the retainer 8 and the adapter 72 in an axially compressed state.

[0037] Furthermore, relative rotation between the clamp 7 and the retainer 8 is restricted by anti-rotation means. In this embodiment, one end of an anti-rotation pin 73 fixed to the clamp 7 is inserted into a recess 83 that is provided in the retainer 8 and opens to the left and outer diameter sides. The configuration of the anti-rotation means may be changed as appropriate.

[0038] As a result, the retainer 8 is allowed to move in the axial direction, and rotates together with the clamp 7 in response to the rotation of the rotary shaft 3. In addition, the rotary seal ring 60, which is biased by the coil spring 80, is kept in an appropriately tight contact with the stationary seal ring 5.

[0039] The set ring 9 is formed in a cylindrical shape. The set ring 9 is fixed to the rotating shaft 3 by a set screw 90 that is threaded into a female screw hole that penetrates the set ring 9 in the radial direction and is pressed against the rotating shaft 3. The set ring 9 restricts the clamp 7 from moving in the axial and rotational directions relative to the rotating shaft 3.

[0040] The vibration damping mechanism 10 is mainly composed of a vibration damping member 11 and an O-ring 15 as an elastic member.

[0041] 1 to 3, the vibration damping member 11 is a rigid metal molded product in the shape of a cylinder with a bottom. Specifically, the vibration damping member 11 has a cylindrical vibration damping portion 111 extending in the axial direction, and a support surface portion 112 extending radially inward from the left end of the vibration damping portion 111. The vibration damping member 11 may be any rigid body that is not easily elastically deformed, and may be a resin molded product.

[0042] As shown in FIGS. 3(a) and 3(b), the support surface portion 112 is an annular flat plate, and has four through holes 112a that penetrate in the axial direction and are evenly spaced in the circumferential direction.

[0043] 3(a) and 3(c), the vibration damping part 111 has a cylindrical shape with a diameter slightly larger than that of the clamp 7. The vibration damping part 111 has four through holes 111a that penetrate in the radial direction and are evenly spaced in the circumferential direction. The through holes 111a and 112a are out of phase with each other in the circumferential direction.

[0044] Furthermore, a tapered surface 111b that widens toward the right side is formed on the inner edge on the tip side of the vibration suppression portion 111, that is, on the inner edge on the right end side.

[0045] As will be described later, O-ring 15 has its longitudinal ends joined together to form a ring shape. Note that the O-ring may have its ends joined together at two or more locations, and this may be modified as appropriate.

[0046] Next, a description will be given of a method for assembling the vibration suppression mechanism 10 to the rotating element R. First, with reference to Fig. 4(a), the O-ring 15 is fitted into the annular groove 81 of the retainer 8.

[0047] Next, the vibration damping member 11 is inserted from the left end. The inner peripheral surface 112b of the support surface portion 112 of the vibration damping member 11 is formed to have approximately the same diameter as the outer peripheral surface 9a of the set ring 9. This allows the vibration damping member 11 to be inserted stably along the outer peripheral surface 9a of the set ring 9.

[0048] Furthermore, the vibration-damping portion 111 has a diameter slightly larger than that of the clamp 7, so that the inner peripheral surface 111c of the vibration-damping portion 111 is less likely to bite into the outer peripheral surface 7c of the clamp 7 during insertion, making it easier to insert the vibration-damping member 11.

[0049] When the vibration-damping member 11 is inserted, first, the tip of the vibration-damping portion 111 comes into contact with the O-ring 15. At this time, even if the O-ring 15 is pushed axially to the right by the vibration-damping portion 111, the side wall 81a of the annular groove 81 of the retainer 8 restricts the O-ring 15 from moving axially to the right. This restricts the O-ring 15 from rolling up and prevents the O-ring 15 from falling off the retainer 8.

[0050] Furthermore, the inner edge of the tip end of the vibration damping portion 111 forms a tapered surface 111b, so that the O-ring 15 does not get caught on the vibration damping portion 111 during insertion. This prevents damage to the O-ring 15 and makes it less likely to become twisted. Furthermore, the work of inserting the vibration damping member 11 can be carried out smoothly.

[0051] 4(b), the support surface portion 112 is brought into contact with the left surface 7a of the clamp 7. Since the support surface portion 112 can be brought into contact with the left surface 7a of the clamp 7 in the circumferential direction, the inclination of the vibration damping member 11 is corrected, and the vibration damping member 11 can be attached with high precision.

[0052] Next, the vibration-damping member 11 is rotated in the circumferential direction to adjust the positions of the female screw hole 7b of the clamp 7 and the through-hole 112a of the support surface portion 112. At this time, the state of the gap between the retainer 8 and the vibration-damping portion 111 can be confirmed from the outside through the through-hole 111a provided in the vibration-damping portion 111, and it can be inferred whether the installation state of the O-ring 15 is correct (see FIG. 1). For example, it can be inferred whether the O-ring 15 is twisted, and therefore the O-ring 15 can be installed properly.

[0053] Thereafter, bolts 13 serving as fastening means are threaded from the left side through the through holes 112a of the support surface portion 112 into the female screw holes 7b of the clamp 7, thereby fixing the vibration damping member 11 to the clamp 7. In this way, the vibration damping member 11 is fixed to the clamp 7 by the bolts 13 at multiple locations (four locations in this embodiment) around the circumference of the support surface portion 112, so that the vibration damping member 11 is restricted from rotating circumferentially relative to the clamp 7.

[0054] As explained above, because the support surface portion 112 of the vibration damping member 11 is fixed axially to the left surface 7a of the clamp 7, interference between the vibration damping portion 111 and the clamp 7 can be avoided. In other words, the inner peripheral surface 111c of the vibration damping portion 111 can be spaced radially outward from the outer peripheral surface 7c of the clamp 7, preventing tilting or distortion of the vibration damping portion 111 due to interference between the vibration damping portion 111 and the clamp 7. In other words, the vibration damping member 11 can be attached with high precision, and the vibration damping function of the vibration damping member 11 can be stably exerted.

[0055] Furthermore, because the support surface portion 112 has an annular shape, the structural strength of the support surface portion 112 is high, and it is possible to avoid a situation in which the support surface portion 112 is distorted due to contact with the left surface 7a of the clamp 7, resulting in a decrease in the mounting accuracy of the vibration-damping member 11. Furthermore, the structural strength of the vibration-damping portion 111 is also high, making the vibration-damping portion 111 less likely to deform.

[0056] Furthermore, the inner peripheral surface 112b of the support surface portion 112 is in contact with the outer peripheral surface 9a of the set ring 9, restricting the vibration-damping member 11 from moving radially, thereby preventing the bolt 13 from loosening due to vibrations or the like.

[0057] Furthermore, the vibration-damping portion 111 is shaped to follow the outer peripheral surface 7c of the clamp 7, and the support surface portion 112 is provided integrally with the left end of the vibration-damping portion 111. As described above, the support surface portion 112 of the vibration-damping member 11 is fixed axially to the left surface 7a of the clamp 7, so that the vibration-damping portion 111 can easily maintain a state in which it follows the outer peripheral surface 7c of the clamp 7, and the vibration-damping function can be stably exerted.

[0058] Furthermore, the vibration suppressing portion 111 is cylindrical. This allows the vibration suppressing portion 111 to have an integral structure, which provides high structural strength and makes it less likely to deform. Furthermore, the vibration suppressing portion 111 can be formed with high dimensional precision.

[0059] Furthermore, the state of the O-ring 15 can be checked from the outside through the radial through-holes 111a provided in the vibration damping part 111, and heat can be dissipated to the outside from within the vibration damping member 11. Furthermore, even if a load is applied to the vibration damping part 111 due to frictional force with the O-ring 15 or elastic restoring force, the stress can be released through the through-holes 111a, so deformation of the vibration damping part 111 can be suppressed.

[0060] Furthermore, the retainer 8 is provided with an annular groove 81 in which the O-ring 15 is housed, so that the vibration-damping member 11 can be smoothly inserted until the vibration-damping portion 111 comes into contact with the O-ring 15.

[0061] In this embodiment, the tapered surface 111b has a linear cross section, but the present invention is not limited to this.

[0062] For example, as shown in FIG. 5(a), the portion of the tapered surface 111b' on the inner circumferential surface 111c' side of the vibration damping portion 111' may be curved.

[0063] Furthermore, as shown in FIG. 5(b), the inner edge on the tip side of the vibration suppressing portion 111'' may be a curved surface 111b'' that is convex toward the inner diameter side.

[0064] Furthermore, as shown in FIG. 5(c), the tip end 111d of the vibration suppressing portion 111''' may be bent into an arc shape that is convex toward the inner diameter side.

[0065] In this way, by forming the inner edge of the tip of the vibration-damping portion into a tapered or curved surface, it is possible to prevent the O-ring from getting caught on the vibration-damping portion when the vibration-damping member is inserted. [Example]

[0066] Next, a mechanical seal according to a second embodiment will be described with reference to Fig. 6. Note that a description of the same configuration as in the first embodiment will be omitted.

[0067] As shown in Fig. 6, the mechanical seal of this second embodiment uses a vibration-damping member 21. The vibration-damping member 21 has a plurality of slits 211a as through-holes in a vibration-damping portion 211. The slits 211a extend in the axial direction and penetrate in the radial direction.

[0068] Although not shown here, the slit 211a is disposed at a position that radially overlaps with the O-ring 15. Therefore, it is easy to check the state of the O-ring 15 through the slit 211a.

[0069] Furthermore, the slits 211a have a larger opening area than the through holes 111a of Example 1, and are formed in greater numbers, which improves the heat dissipation effect and also facilitates the release of stress acting on the vibration damping portion 211. Furthermore, the vibration damping member 21 can be made lighter than the vibration damping member 11 of Example 1.

[0070] In this way, the shape and number of through holes provided in the vibration suppression section can be freely changed. [Example]

[0071] Next, a mechanical seal according to a third embodiment will be described with reference to Fig. 7. Note that a description of the same configuration as in the first embodiment will be omitted.

[0072] As shown in Figure 7, the mechanical seal of this third embodiment uses a vibration-damping member 31. The vibration-damping member 31 is composed of two divided bodies 31A and 31B. The vibration-damping member 31 can be constructed by connecting the divided bodies 31A and 31B with a plurality of bolts and nuts 31C, which makes it easy to assemble the vibration-damping member 31 to the rotating element. [Example]

[0073] Next, a mechanical seal according to a fourth embodiment will be described with reference to Figures 8 and 9. Note that a description of the same configuration as in the first embodiment will be omitted.

[0074] As shown in FIGS. 8 and 9, the mechanical seal of the fourth embodiment has four vibration-damping members 41 that are equally spaced apart in the circumferential direction.

[0075] The vibration damping member 41 includes a plate-shaped vibration damping portion 411 that is curved in the circumferential direction, and a support plate portion 412 that extends from the left end of the vibration damping portion 411 in the radially inward direction.

[0076] In this embodiment, as in the first embodiment, an O-ring 15 is disposed in the annular groove 81 of the retainer 8 (see FIG. 1).

[0077] Since the vibration-damping member 41 is supported by the support plate portion 412, it is possible to prevent the vibration-damping portion 411 from tilting or distorting, and the vibration-damping member 41 can be attached with high precision.

[0078] Furthermore, when the vibration-damping member 41 is fastened to the clamp 7, the vibration-damping portion 411 can be attached to the O-ring 15 from the outer diameter direction, so that the O-ring 15 is hardly subjected to torsion or axial shear force, making it easier to achieve the desired shape of the O-ring 15 after fastening.

[0079] Furthermore, since the vibration-damping portion 411 can bend radially with the support plate portion 412 as its base end, even after the vibration-damping member 41 is finally fixed to the clamp 7, the O-ring 15 can be released from its twisted state or from the state in which it is subjected to axial shear force, and can be brought into the desired shape at the assembly position.

[0080] In the fourth embodiment, four vibration damping members 41 are used, but the number can be freely changed.

[0081] Although the fourth embodiment exemplifies a configuration in which each vibration-damping member 41 is independent, for example, the support plate portion may be annular in the circumferential direction, with multiple claw-shaped vibration-damping portions extending from the support plate portion. Also, multiple plate-shaped support plate portions may extend from a cylindrical vibration-damping portion.

[0082] Next, a mechanical seal according to a fifth embodiment will be described with reference to Fig. 10. Note that a description of the same configuration as in the first embodiment will be omitted.

[0083] As shown in FIG. 10, the vibration damping member 511 has a vibration damping portion 511A, a support surface portion 511B, and a cylindrical portion 511C extending leftward from the inner diameter end of the support surface portion 511B.

[0084] A through-hole 511a that penetrates in the radial direction is formed at the left end of the vibration suppression portion 511A. A through-hole 511Ca that penetrates in the radial direction and serves as a restriction portion is formed in the cylindrical portion 511C.

[0085] A recess 59a recessed toward the inner diameter side is formed in the set ring 59 of this embodiment 5. A female screw hole 57b recessed toward the inner diameter side from the outer circumferential surface is formed in the clamp 57.

[0086] Next, the assembly of the vibration damping member 511 will be described.

[0087] When vibration damping member 511 is inserted from the left end, the inner peripheral surface of cylindrical portion 511C slides along the outer peripheral surface of set ring 59. After support surface portion 511B abuts against left surface 57a of clamp 57, through-hole 511Ca of cylindrical portion 511C and recess 59a of set ring 59 are aligned so as to overlap in the radial direction.

[0088] With the through hole 511Ca of the cylindrical portion 511C and the recess 59a of the set ring 59 overlapping in the radial direction, the through hole 511a of the vibration suppression portion 511A and the female screw hole 57b of the clamp 57 are aligned in the radial direction.

[0089] Thereafter, the set pin 52 is press-fitted from the outside into the recess 59a of the set ring 59 through the through-hole 511Ca of the cylindrical portion 511C and fixed therein. This restricts the axial movement of the vibration damping member 511 relative to the set ring 59.

[0090] With the axial movement of the vibration-damping member 511 restricted relative to the set ring 59, a bolt 571 is fastened to the female screw hole 57b of the clamp 57 through the through hole 511a of the vibration-damping portion 511A.

[0091] Since the axial movement of the vibration damping member 511 is restricted by the interference between the set pin 52 and the cylindrical portion 511C, the axial movement of the vibration damping member 511 can be restricted when the bolt 571 is fastened from the radial direction.

[0092] The restricting portion of the vibration-damping member is not limited to that of Example 5. Specifically, it is sufficient if a recessed and projecting fitting portion is provided between the vibration-damping member and the element to which it is fixed, and for example, a protrusion may be provided on the vibration-damping member side and a recess may be provided on the element to which it is fixed.

[0093] Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention also includes modifications and additions that do not deviate from the gist of the present invention.

[0094] For example, in the above-described Examples 1 to 5, the vibration-damping member is provided on the rotating element, but it may be provided on the stationary element. It is preferable that the vibration-damping member is provided on the member on which the biasing member is disposed.

[0095] Furthermore, in the first to fifth embodiments, the biasing means is provided on the rotating element, but this is not limiting, and the biasing means may be provided on the stationary element.

[0096] Furthermore, in the first to fifth embodiments, the vibration-damping member is described as being fixed to a clamp, but this is not limiting and the vibration-damping member may be fixed to a surface that intersects with the axial direction of a set ring or a sleeve that is fitted onto the rotating shaft, or may be changed as appropriate as long as it is a rotating-side element. The same applies to the case where the biasing member is disposed on the stationary-side element, and the vibration-damping member may be fixed to any surface that intersects with the axial direction of the stationary-side element, for example, to a surface that intersects with the axial direction of the housing.

[0097] Furthermore, in Examples 1 to 4, the left surface of the clamp to which the support surface portion of the vibration-damping member is fixed is perpendicular to the axial direction, but the surface to which the support surface portion of the vibration-damping member is attached may be any surface that intersects the axial direction, and may, for example, be inclined relative to the axial direction.

[0098] Furthermore, in Examples 1 to 5, the configuration in which a retaining member is provided has been exemplified, but the retaining member may be omitted. In this case, it is sufficient that an elastic member is disposed between the inner peripheral surface of the vibration-damping portion of the vibration-damping member and the outer peripheral surface of the seal ring.

[0099] Furthermore, in the above-described Examples 1 to 5, the inner peripheral surface of the support surface portion is in contact with the outer peripheral surface of the set ring, but it is not necessary for the inner peripheral surface to be in contact with the outer peripheral surface of the set ring.

[0100] Furthermore, in the first to fifth embodiments, the vibration-damping portion is provided with through-holes or slits that penetrate in the radial direction, but the through-holes or slits may not necessarily be provided.

[0101] In addition, in the first to fifth embodiments, the elastic member is an O-ring, but this is not limited to this and may be a packing with a rectangular cross section, an elliptical cross section, or an X-shaped cross section. Furthermore, the elastic member is not limited to being annular, and multiple elastic members may be provided in the circumferential direction between the vibration damping part and the retainer.

[0102] Furthermore, the elastic member may be held in position by adhesion, or the elastic member may be attached and fixed to the tip of the vibration-damping part, and the holding means for holding the elastic member may be changed as appropriate.

[0103] In addition, in the above-described Examples 1 to 5, the rotary seal ring is described as being part of a bellows, but this is not limiting and the rotary seal ring may be a single seal ring without the bellows portion, etc. This also applies to the case where a vibration-damping member is applied to a stationary seal ring.

[0104] Furthermore, in the above-described Examples 1 to 5, the biasing means is described as being a coil spring, but this is not limited to this, and the biasing means may also be a bellows, a coiled wave spring, or rubber, or a combination of any of these, or may be modified as appropriate.

[0105] Furthermore, in the above-described Examples 1 to 5, an annular groove 81 for accommodating an O-ring 15 is provided in the retainer 8, but this is not limited to this, and a groove for accommodating an elastic member may be provided on the inner peripheral surface of the vibration-damping portion of the vibration-damping member. [Explanation of symbols]

[0106] 1 Mechanical seal 2. Housing 3 Rotation Axis 5 Stationary sealing ring 6 Bellows 7 Clamp 7a Left side (intersecting surface) 8 Retainer (retaining member) 9 Set Rings 10. Vibration control mechanism 11 Vibration-damping member 13 Bolt (fastening means) 15 O-ring (elastic member) 60 Rotating seal ring 61 Bellows section 62 Proximal end 80 Coil spring (biasing means) 81 Annular groove 81a Side wall 111 Vibration control section 111a Through hole 111b Tapered surface 112 Support surface section Q Stationary element R Rotation side element

Claims

1. a pair of seal rings fixed to the stationary element and the rotating element; a biasing means for biasing one of the pair of seal rings toward the other; a vibration-damping member having a vibration-damping portion disposed on an outer diameter side of the one seal ring or a retaining member that holds the seal ring; an elastic member disposed between the one seal ring or the retaining member and the vibration damping portion, The vibration-damping member is a mechanical seal having a support surface portion that is axially fixed to the stationary element or the rotating element.

2. 2. The mechanical seal according to claim 1, wherein the vibration damping portion is shaped along the circumferential direction of the stationary element or the rotating element, and the support surface portion is integrally provided at one end of the vibration damping portion.

3. 2. The mechanical seal according to claim 1, wherein the support surface portion is annular.

4. 4. The mechanical seal according to claim 1, wherein the vibration-damping portion is cylindrical.

5. The mechanical seal according to claim 4, wherein the vibration-damping portion is formed with a through-hole that penetrates in the radial direction.

6. 2. The mechanical seal according to claim 1, wherein the elastic member is annular, and the retaining member is provided with an annular groove in which the elastic member is disposed.

7. 2. The mechanical seal according to claim 1, wherein the inner edge of the vibration-damping portion on the tip side is a tapered surface that widens toward the tip.

8. 2. The mechanical seal according to claim 1, wherein the inner edge of the vibration-damping portion at the tip end thereof is a curved surface that is convex toward the inner diameter side.

9. a pair of seal rings fixed to the stationary element and the rotating element; a biasing means for biasing one of the pair of seal rings toward the other; a vibration-damping member having a vibration-damping portion disposed on an outer diameter side of the one seal ring or a retaining member that holds the seal ring; an elastic member disposed between the one seal ring or the retaining member and the vibration damping portion, The vibration-damping member is a mechanical seal having a restricting portion that restricts axial movement of the stationary element or the rotating element.

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