JP2011058515A - Mechanical seal device and fixing method of rotary ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mechanical seal device which allows a rotary ring to be compactly and easily fixed to a rotary shaft, and a fixing method of the rotary ring employed for a mechanical seal. <P>SOLUTION: A mechanical seal device comprises a rotary ring 50 which contains an inner peripheral surface 50b formed with a stopper engaging groove therein, a fixing ring 30, a sleeve 34 which contains a rotary ring locking surface 36 fixed to the rotary shaft to lock the rotary ring and an outer peripheral surface containing a stopper accommodation groove 40 opposed to the stopper engaging groove and a through hole 42 communicating to the stopper accommodation groove, a stopper member 60 which contains a first part engaged with the stopper accommodation groove in the sleeve and a second part engaged with the stopper engaging groove in the rotary ring and has a substantially C-shaped outer shape, and a knock pin 62 which contains one end inserted into the through hole and the other end arranged in the stopper accommodation groove and brought into contact with a stopper member and supports a second part of the stopper member toward the radial outside. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a mechanical seal device capable of compactly fixing a rotating ring with respect to a rotating shaft and a fixing method of the rotating ring used for the mechanical seal.

  In the mechanical seal device, various forms have been proposed as a structure for fixing the rotating ring to the rotating shaft. Among them, as a conventional technique for compactly fixing the rotating ring with respect to the rotating shaft, for example, grooves are formed in both the rotating ring and the retainer, and a stopper is inserted between both grooves. A technique for fixing a rotating ring is known (for example, see Patent Document 1).

  However, the conventional technology that inserts a stopper into the groove formed on both the rotating ring and the retainer has a problem that it takes time to assemble because the wire constituting the stopper is bent or the wire is caught in the groove at the time of insertion. have.

JP 2001-141076 A

  The present invention has been made in view of such problems, and an object of the present invention is to provide a mechanical seal device capable of compactly and easily fixing the rotary ring to the rotary shaft and a rotary ring used in the mechanical seal. It is to provide a fixing method.

In order to solve the above-mentioned problem, a mechanical seal device of the present invention according to claim 1 is provided.
A rotating ring side seal surface formed on at least one surface in the axial direction of the rotating shaft, and an inner peripheral surface facing the rotating shaft and having a stopper engaging groove formed thereon, A rotating ring installed on the rotating shaft so as to rotate integrally with the rotating shaft;
A stationary ring including a stationary ring side sealing surface that slides in close contact with the rotating ring side sealing surface;
A rotating ring locking surface that is fixed to the rotating shaft and locks the rotating ring from the outside or the inside of the machine in the axial direction, and a stopper storage groove that is disposed so as to face the stopper engaging groove. An outer peripheral surface formed, and a sleeve in which a radial through hole communicating with the stopper storage groove is formed;
A first portion engaged with the stopper receiving groove of the sleeve; and a second portion engaged with the stopper engaging groove of the rotating ring and having a substantially C-shaped outer shape. A stopper member;
One end portion inserted into the through hole, and the other end portion disposed in the stopper receiving groove and contacting the stopper member, and the second portion of the stopper member is disposed in the radial direction. And a knock pin that supports the outer side.

  The mechanical seal device of the present invention having such a configuration is compact without requiring a wide space in the axial direction and the radial direction in the rotating ring fixing structure. The sleeve has a through hole. By inserting a knock pin into the through hole, the second portion of the stopper member is moved outward in the radial direction, and the second portion is engaged with the stopper of the rotating ring. It can be engaged with the groove. That is, in the mechanical seal device according to the present invention, before attaching the rotating ring to the sleeve, the stopper member is arranged in the stopper receiving groove of the sleeve in advance, and after attaching the rotating ring to the sleeve, a part of the stopper member is placed. It can be engaged with the stopper engaging groove of the rotating ring. Therefore, unlike the prior art, the mechanical seal device according to the present invention does not require the stopper member to be inserted into the groove after the rotary ring is attached to the sleeve, and is easy to assemble.

  Further, for example, in the mechanical seal device according to the present invention, the stopper engaging groove of the rotating ring may be an L-shaped groove having a substantially L-shaped longitudinal section. By making the stopper engaging groove an L-shaped groove, the processing for forming the stopper engaging groove in the rotating ring becomes easy. If the stopper engaging groove is an L-shaped groove, a jig is inserted into the stopper engaging groove, and the second portion of the stopper member is pushed back into the stopper receiving groove of the sleeve, so that the fixing of the rotating ring can be easily released. can do.

  Further, for example, in the mechanical seal device according to the present invention, the stopper engaging groove of the rotating ring may include a straight portion represented by a straight line in a transverse section. The straight portion of the stopper engaging groove can serve as a rotation stopper that prevents the rotating ring from rotating with respect to the sleeve by locking the second portion of the stopper member in the rotation direction. Therefore, since such a mechanical seal device does not require a separate structure for stopping the rotation of the rotating ring, the structure for fixing the rotating ring can be simplified, and is suitable for downsizing.

  Further, for example, in the mechanical seal device according to the present invention, the stopper member may be made of a soft material that is plastically deformed in contact with the knock pin. By using a stopper member made of a soft material as the stopper member, the load acting on the knock pin for supporting the stopper member in the radial direction is reduced. In addition, since the force required to temporarily fix the knock pin to the through hole after the knock pin is inserted into the through hole until the sleeve is inserted into the rotating shaft, such a mechanical seal is further assembled. Is easy.

The fixing method according to the present invention includes:
A rotating ring fixing method used in a mechanical seal device,
A rotating ring locking surface that can be fixed to the rotating shaft and that locks the rotating ring from the outside or inside of the machine in the axial direction of the rotating shaft, and a surface that faces the rotating ring, and a stopper storage groove is formed. An outer peripheral surface, and a step of preparing a sleeve in which a radial through hole communicating with the stopper storage groove is formed;
A procedure for installing a stopper member having a substantially C-shaped outer shape in the stopper receiving groove of the sleeve;
A rotating ring side seal surface formed on at least one surface of the rotating shaft in the axial direction, and a stopper engaging groove disposed on the surface facing the rotating shaft and facing the stopper storing groove. A step of locking the rotating ring including the inner peripheral surface formed with the rotating ring locking surface of the sleeve;
The stopper member is inserted into the through hole of the sleeve from the inside in the radial direction, and the tip of the knock pin projects from the through hole into the stopper housing groove to push the stopper member outward in the radial direction. Engaging a part thereof with the stopper engaging groove of the rotating ring.

  In the fixing method according to the present invention, before the rotating ring is attached to the sleeve, the stopper member is previously arranged in the stopper receiving groove of the sleeve, and after the rotating ring is attached to the sleeve, a part of the stopper member is attached to the rotating ring. It can be engaged with the stopper engaging groove. Therefore, unlike the prior art, the fixing method according to the present invention does not require the stopper member to be inserted into the groove after the rotary ring is attached to the sleeve, and the wire is bent or the wire is caught in the groove at the time of insertion. Therefore, the rotating ring can be easily fixed.

FIG. 1 is a longitudinal sectional view showing a configuration of a mechanical seal device according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view schematically showing first to third steps in an assembling procedure for fixing the rotating ring. FIG. 3 is a longitudinal sectional view schematically showing a fourth stage in the assembly procedure for fixing the rotating ring. FIG. 4 is an enlarged view in which the periphery of the rotating ring in the schematic cross-sectional view shown in FIG. 3 is enlarged. FIG. 5 is a longitudinal sectional view schematically showing a fifth stage in the assembly procedure for fixing the rotating ring. FIG. 6 is a cross-sectional view schematically showing a third stage in the assembly procedure for fixing the rotating ring. FIG. 7 is a cross-sectional view schematically showing a fourth stage in the assembly procedure for fixing the rotating ring. FIG. 8 is a cross-sectional view schematically showing a fifth stage in the assembly procedure when the rotating ring is fixed. 9A and 9B are a plan view and a longitudinal sectional view showing the shape of the rotary ring locking surface formed on the sleeve in the mechanical seal device shown in FIG. 10 is a longitudinal sectional view and a plan view showing the shape of a surface engaged with the rotating ring locking surface shown in FIG. 9 among the surfaces included in the rotating ring of the mechanical seal device shown in FIG. 1. FIG. 11 is a plan view and a longitudinal sectional view showing the shape of a rotary ring included in the mechanical seal device according to the second embodiment of the present invention.

First Embodiment A mechanical seal device according to an embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the present invention will be described by exemplifying a mechanical seal device mounted in a cartridge format with respect to a housing of a device through which a rotating shaft passes. In this embodiment, the description will be made using a single seal mechanical seal having one sliding surface. However, the mechanical seal device according to the present invention is not limited to this. For example, two sliding surfaces are back-to-back. The mechanical seal apparatus of the double seal structure arrange | positioned in may be sufficient.

  FIG. 1 is a cross-sectional view showing the configuration of the mechanical seal device 10 of the present embodiment, and shows a state in which the mechanical seal device 10 is mounted on a housing 72. As shown in FIG. 1, a shaft hole 73 is formed in the housing 72, and the rotating shaft 70 passes through the shaft hole 73. The mechanical seal device 10 is installed with respect to the housing 72 and the rotation shaft 70 so as to seal a gap between the rotation shaft 70 penetrating the shaft hole 73 and the housing 72. As shown in FIG. 1, the shaft hole 73 side (the left side in the figure) is the inboard side space A with respect to the mechanical seal device 10, and the opposite side in the axial direction (the right side in the figure) is the outboard side space B (for example, the atmosphere side) ).

  The mechanical seal device 10 includes a rotary ring 50, a fixed ring 30, a sleeve 34, a stopper member 60, a knock pin 62, and a seal cover 12 as main components. Further, the mechanical seal device 10 includes a sleeve collar 24, a set screw 26, a stationary ring rotation stop pin 22, a spring 20, an O-ring, and the like as other components.

  In the mechanical seal device 10, the rotation ring side seal surface 52 of the rotation ring 50 and the fixed ring side seal surface 32 of the fixed ring 30 slide closely to each other, so that the space between the machine interior space A and the machine exterior space B is maintained. Seal to form a mechanical seal.

  The seal cover 12 is installed in the housing 72 of the apparatus main body. The seal cover 12 is fixed to the housing 72 by tightening each bolt 16 in a bolt hole (not shown) formed in the housing 72. That is, in FIG. 1, the bolt 16 fixes the seal cover 12 to the housing 72 via the nut 14. As shown in FIG. 1, an O-ring 18 is interposed between the inboard end surface 12 a of the seal cover 12 and the outer surface 72 a of the housing 72. Thereby, the space between the inboard end surface 12a of the seal cover 12 and the outer surface 72a of the housing 72 is reliably sealed.

  The seal cover 12 accommodates the rotary ring 50 and the fixed ring 30. The seal cover 12 is formed with an internal hole 13 that communicates with the shaft hole 73 when the seal cover 12 is fixed to the housing 72. The inner hole 13 is penetrated by the rotating shaft 70, and the fixed ring 30, the rotating ring 50, a part of the sleeve 34, and the like are disposed inside the inner hole 13.

  A stationary ring installation portion 15 that protrudes in a stepped manner toward the inner peripheral side (rotation shaft 70 side) is formed at the machine outer end of the seal cover 12. That is, the inner hole 13 of the seal cover 12 includes a large-diameter portion 13a which is a part inside the machine from the fixed ring installation portion 15, and a small-diameter portion 13b whose inner diameter is smaller than the large diameter portion 13a by the fixed ring installation portion 15. Consists of.

  The fixed ring 30 is fitted and installed in the fixed ring installation part 15. An inner peripheral step surface 15 a that is substantially parallel to a plane orthogonal to the rotation shaft 74 and faces the inside of the machine is formed on the inner peripheral surface 15 d of the fixed ring installation portion 15. On the other hand, an outer peripheral step surface 30a is formed on the outer peripheral surface 30e of the fixed ring 30 so as to be substantially parallel to a plane orthogonal to the rotation shaft 74 and facing the outside of the machine. The fixed ring 30 is disposed such that the outer peripheral step surface 30 a of the fixed ring 30 faces the inner peripheral step surface 15 a of the fixed ring installation portion 15. An O-ring 28 is disposed in an annular space having a rectangular cross section formed between the outer peripheral step surface 30a and the inner peripheral step surface 15a. As described above, the fixed ring 30 is fitted into the fixed ring installation portion 15 with the O-ring 28 interposed therebetween, so that the fixed ring outer peripheral surface 30e of the fixed ring 30 and the installation portion inner peripheral surface 15d of the fixed ring installation portion 15 are fixed. The space is sealed.

  A fixed ring rotation stop pin 22 that protrudes inward in the axial direction machine is provided on the machine inner end face 15 b of the fixed ring installation part 15. The fixed ring 30 protrudes outward in the radial direction, and has a flange portion 30b in which a guide groove for fitting the fixed ring rotation stop pin 22 is formed. The end of the fixed ring rotation stop pin 22 is fitted into a guide groove formed in the flange portion 30 b of the fixed ring 30, and prevents the fixed ring 30 from rotating relative to the seal cover 12.

  The fixed ring installation portion 15 is provided with a spring 20 that presses the fixed ring 30 toward the rotating ring 50. That is, a plurality of spring seats 15c are provided in the circumferential direction on the inboard end surface 15b of the fixed ring installation portion 15, and the springs 20 are installed on the spring seats 15c. The spring 20 is held between the spring seat 15 c of the fixed ring installation part 15 and the flange part machine outer side end face 30 c of the flange part 30 b of the fixed ring 30. Thus, the seal cover 12 supports the stationary ring 30 via the spring 20 so as to be movable along the axial direction.

  The stationary ring 30 includes a stationary ring side sealing surface 32 which is one sealing surface in the mechanical seal. That is, a protrusion 30 d that protrudes toward the rotary ring 50 disposed on the inner side of the fixed ring 30 is formed at the end of the fixed ring 30 on the inner side. A fixed ring side seal surface 32 that slides in close contact with the rotary ring side seal surface 52 included in the rotary ring 50 is formed on the inner end surface of the projection 30d. Since the fixed ring 30 is pressed toward the rotary ring 50 by the spring 20, when the rotary shaft 70 starts rotating, the fixed ring side seal surface 32 closely slides against the rotary ring side seal surface 52 of the rotary ring 50. Move.

  The rotating ring (mate ring) 50 includes a rotating ring side seal surface 52 that is the other seal surface of the mechanical seal. The rotary ring side seal surface 52 is formed on an end surface 50 a (rotary ring machine outer side end surface) of the rotary ring 50 on the outer side in the axial direction, and slides closely with the fixed ring side seal surface 32. The rotating ring 50 is fitted and installed on the rotating shaft 70 via the sleeve 34 and rotates integrally with the rotating shaft 70.

  The rotating ring 50 is locked to the rotating ring locking surface 36 of the sleeve 34. The sleeve 34 includes a rotary ring locking surface 36 that is substantially parallel to a plane orthogonal to the rotation shaft 70 and faces the inside of the machine. That is, the rotary ring locking surface 36 locks the rotary ring machine outer end surface 50a of the rotary ring 50 from the machine side in the axial direction.

  As shown in FIG. 4 in which the periphery of the rotating ring 50 is enlarged, a sleeve engaging groove 54 is formed on the outer end surface 50 a of the rotating ring machine 50.

  The sleeve engaging groove 54 is formed on the rotary ring inner peripheral surface 50b side of the rotary ring outer end surface 50a of the rotary ring 50, and is formed on both the rotary ring outer rotary end surface 50a and the rotary ring inner peripheral surface 50b. Has an opening. That is, the sleeve engagement groove 54 in the present embodiment is an L-shaped groove having a substantially L-shaped vertical cross section.

  Further, the sleeve 34 is formed with an engaging projection 37 that is engaged with the sleeve engaging groove 54. The engagement protrusion 37 protrudes from the rotary ring locking surface 36 of the sleeve 34 to the inner side in the axial direction. Furthermore, as shown in FIG. 10, the sleeve engagement groove 54 includes a straight portion 54 a that is represented by a straight line in the cross section. Further, as shown in FIG. 9, the engagement protrusion 37 formed on the sleeve 34 also includes a straight portion 37a represented by a straight line in the cross section. The sleeve engagement groove 54 of the rotary ring 50 and the engagement protrusion 37 of the sleeve 34 are arranged so that the straight portions 54a and 37a are engaged with each other. This prevents the rotary ring 50 from rotating relative to the sleeve 34.

  As shown in FIG. 4 in which the periphery of the rotating ring 50 is enlarged, a stopper engaging groove 56 is formed on the inner surface 50b of the rotating ring which is a surface facing the rotating shaft 70 among the surfaces of the rotating ring 50. Yes.

  As shown in FIG. 4, the stopper engaging groove 56 is formed at the inner end of the rotary ring 50 on the inner peripheral surface 50 b of the rotary ring 50, and the rotary ring inner end surface 50 c of the rotary ring 50 and the rotary ring Both of the 50 inner peripheral surfaces 50b of the rotating ring have openings. That is, the stopper engaging groove 56 in the present embodiment is an L-shaped groove having a substantially L-shaped longitudinal section.

  As shown in FIG. 1, a part of the stopper member 60 is engaged with the stopper engaging groove 56. The stopper member 60 has a substantially C-shaped outer shape as shown in FIG. 6B, and is constituted by a wire such as a wire. As shown in FIGS. 1 and 8, the sleeve outer peripheral surface 38 is formed with a stopper housing groove 40 disposed so as to face the stopper engaging groove 56, and another part of the stopper member 60. Is engaged with the stopper receiving groove 40. That is, the stopper member 60 includes a first portion 60 a engaged with the stopper housing groove 40 of the sleeve 34 and a second portion 60 b engaged with the stopper engaging groove 56 of the rotating ring 50. (See FIG. 8).

  The stopper member 60 cannot move in the axial direction because the first portion 60 a is engaged with the stopper housing groove 40. The rotary ring 50 is prevented from moving inward in the axial direction by engaging the second portion 60 b of the stopper member 60 with the stopper engaging groove 56. Further, since the rotary ring 50 is prevented from moving outward in the axial direction by the rotary ring locking surface 36 of the sleeve 34, the relative movement to any side along the axial direction with respect to the sleeve 34 is also prevented. Has been.

  The length (depth) of the stopper engaging groove 56 formed in the rotating ring 50 in the radial direction is preferably smaller than the diameter of the wire constituting the stopper member 60. This is because all of the stopper member 60 is accommodated in the stopper engaging groove 56, and the rotating ring 50 together with the stopper member 60 is prevented from falling off from the sleeve 34 to the inner side in the axial direction.

  A plurality of radial through holes 42 are formed in the sleeve 34 in the circumferential direction. The through hole 42 communicates with the stopper housing groove 40 from the sleeve inner peripheral surface 39 of the sleeve 34.

  A knock pin 62 is inserted into the through hole 42. As shown in FIG. 8B, the inner end 62 a of the knock pin 62 is inserted into the through hole 42, and the outer end 62 b of the knock pin 62 is disposed in the stopper receiving groove 40 of the sleeve 34. Is done. An end 62b on the outer peripheral side of the knock pin 62 is in contact with the stopper member 60 from the inner peripheral side.

  The portion of the stopper member 60 that is in contact with the knock pin 62 from the inner peripheral side swells outward in the radial direction, as shown in FIG. Therefore, the portion of the stopper member 60 that is in contact with the knock pin 62 from the inner peripheral side corresponds to the second portion 62b that is engaged with the stopper engaging groove 56 of the rotating ring 50 in the circumferential direction. (FIG. 8). Here, as shown in FIG. 1, since the inner peripheral side of the sleeve 34 is penetrated by the rotating shaft 70, the knock pin 62 does not fall off from the sleeve inner peripheral surface 39 side of the sleeve 34. Therefore, the knock pin 62 can support the second portion 62b of the stopper member 60 toward the outer side in the radial direction.

  As shown in FIG. 1, the sleeve 34 has a hollow cylindrical outer shape, and is fixed to the rotating shaft 70 in a state where the rotating shaft 70 is held. A U-shaped groove for accommodating an O-ring 44 is formed in the sleeve inner peripheral surface 39 of the sleeve 34, and the O-ring 44 includes the sleeve inner peripheral surface 39 of the sleeve 34 and the rotary shaft outer peripheral surface of the rotary shaft 70. Seal between 70a. The sleeve 34 is fixed to the rotating shaft 70 by the set screw 26 and can rotate integrally with the rotating shaft 70. That is, the sleeve collar 24 is fitted to the sleeve outer peripheral surface 38 at the end portion on the machine outer side of the sleeve 34. The set screw 26 is inserted from the outer peripheral side of the sleeve collar 24, and the sleeve collar 24 and the sleeve 34 are integrally screwed to the rotating shaft 70 and fixed. By screwing the set screw 26 to the rotating shaft 70, the assembly structure in which the rotating ring 50 is attached to the sleeve 34 is fixedly installed on the rotating shaft 70.

  Of the sleeve inner peripheral surface 39 of the sleeve 34, the vicinity of the opening on the inner peripheral side of the through hole 42 formed in the sleeve 34 is a relief portion 39 a having a slightly larger inner diameter than other portions constituting the sleeve inner peripheral surface 39. Is formed (FIG. 4). The escape portion 39a makes the surface required for processing accuracy fitted to the rotary shaft 70 as small as possible, and prevents distortion or the like when drilling or threading the sleeve 34 from affecting the fitting surface. Formed for. Alternatively, the escape portion 39a is formed so that the temporary fixing agent of the knock pin 62 does not adhere to the vicinity of the opening and obstruct the insertion of the rotary shaft 70.

  Hereinafter, a fixing method for fixing the rotating ring 50 included in the mechanical seal device 10 shown in FIG. 1 to the rotating shaft 70 via the sleeve 34 will be described with reference to FIGS. FIG. 2 is a vertical cross-sectional view (a cross-sectional view with a cross section including the axial center 74 of the rotating shaft 70) schematically showing first to third stages in the assembly procedure for fixing the rotating ring 50.

  When the rotary ring 50 is fixed to the rotary shaft 74 in the mechanical seal device 10 shown in FIG. 1, first, the rotary ring 50 is installed on the sleeve 34. In the first stage in the assembling procedure for fixing the rotary ring 50, the sleeve 34 shown in FIG. 2 is prepared.

  As shown in FIG. 2, the sleeve 34 has a rotating ring locking surface 36 that locks the rotating ring 50 from the outside in the axial direction of the rotating shaft 70. Further, a stopper housing groove 40 and an O-ring housing groove 48 are formed on the sleeve outer peripheral surface 38 of the sleeve 34.

  Further, the sleeve 34 is formed with a radial through hole 42 communicating with the stopper housing groove 40. FIG. 6A is a cross-sectional view of the sleeve 34 (a cross-sectional view taken along a cross section orthogonal to the axial center 74 of the rotating shaft 70), and is a view showing a cross section passing through the stopper housing groove 40. As shown in FIG. 6A, the sleeve 34 has four through holes 42 formed therein. Each through-hole 42 is formed at substantially equal intervals in the circumferential direction.

  As shown in FIG. 2, the rotary ring locking surface 36 locks the rotary ring 50 inserted from the machine inner side with respect to the sleeve 34 from the machine outer side, so that the stopper storage groove 40 and the O-ring storage groove 48 are It is formed inside the machine with respect to the rotary ring locking surface 36. However, in another embodiment, the rotating ring locking surface may lock the rotating ring inserted from the outside of the machine from the inside of the machine. In that case, the stopper storage groove and the O-ring storage groove may be formed outside the machine with respect to the rotating ring locking surface.

  Next, in the procedure 2, the O-ring 46 shown in FIG. 2 is attached to the sleeve 34 prepared in the procedure 1. The O-ring 46 is stored in an O-ring storage groove 48 formed on the sleeve outer peripheral surface 38 of the sleeve 34.

  Furthermore, in the procedure 3, the stopper member 60 shown in FIG. 2 is attached to the sleeve 34 prepared in the procedure 1. FIG. 6B is a cross-sectional view of the stopper member 60. As shown in FIG. 6B, the stopper member 60 has a substantially C-shaped outer shape that extends in the circumferential direction and is partially cut, and is constituted by a wire such as a wire. The material constituting the stopper member 60 is not particularly limited, but a material having appropriate elasticity, ductility and malleability can be used. The stopper member 60 can be manufactured using steel materials, such as SUS, for example.

  As shown in FIG. 3, the stopper member 60 is housed in a stopper housing groove 40 formed on the sleeve outer peripheral surface 38 of the sleeve 34. Here, since the stopper member 60 can be attached to the sleeve 34 before the rotating ring 50 is attached to the sleeve 34, the stopper member 60 is easily attached to the sleeve 34. For example, a stopper member 60 as shown in FIG. 6B is expanded in the radial direction within a range in which the stopper member 60 can be elastically deformed, and a part of the stopper member 60 is engaged with the stopper housing groove 40. Thereafter, the stopper member 60 can be easily attached to the stopper housing groove 40 by contracting the stopper member 60 in the radial direction by elastic deformation of the stopper member 60.

  As shown in FIG. 4, the entire stopper member 60 is housed in the stopper housing groove 40 from when the stopper member 60 is attached to the sleeve 34 until the knock pin 62 is inserted into the through hole 42. That is, the length (depth) of the stopper housing groove 40 formed in the sleeve 34 in the radial direction is larger than the diameter of the wire constituting the stopper member 60. Further, the stopper member 60 can be brought into close contact with the storage groove inner peripheral surface 40a of the stopper storage groove 40 by its own elastic force.

  In Procedure 4, the rotating ring 50 shown in FIG. 2 is attached to the sleeve 34 to which the O-ring 46 and the stopper member 60 are attached. FIG. 3 is a longitudinal sectional view showing a state immediately after the rotating ring 50 is attached to the sleeve 34 in the procedure 4. FIG. 4 is an enlarged view in which the periphery of the rotating ring 50 in the schematic cross-sectional view shown in FIG. 3 is enlarged.

  As shown in FIG. 3, the rotating ring 50 is inserted into the sleeve 34 from the inside of the machine and is locked to the rotating ring locking surface 36 of the sleeve 34. In the procedure 4, when the rotary ring 50 is inserted into the sleeve 34, the rotary ring inner peripheral surface 50 b of the rotary ring 50 can pass through the outer diameter side (outer side in the radial direction) of the stopper member 60. This is because, as shown in FIG. 4, the depth of the stopper receiving groove 40 is designed to be larger than the diameter of the stopper member 60, and when the rotary ring 50 is inserted, the entire stopper member 60 is inserted into the stopper receiving groove 40. It is because it is stored.

  As shown in FIG. 4, the rotating ring 50 is attached to the sleeve 34 so that the sleeve engaging groove 54 of the rotating ring 50 and the engaging protrusion 37 of the sleeve 34 are engaged. Thereby, the center of the rotating ring 50 and the center of the sleeve 34 can be matched, and the center of the rotating ring 50 and the axis center 74 of the rotating shaft 70 to which the sleeve 34 is attached can be easily matched. Further, as shown in FIGS. 9 and 10, the sleeve engaging groove 54 and the engaging protrusion 37 have straight portions 54a and 37a that engage with each other. Therefore, the rotating ring 50 is prevented from rotating relative to the sleeve 34, and can rotate integrally with the rotating shaft 70 when the sleeve 34 is fixed to the rotating shaft 70.

  In the state immediately after the procedure 4 is finished, as shown in FIGS. 3 and 4, the rotary ring 50 is not restricted to move inward in the axial direction machine and can fall out in the axial direction machine. Is in a state. As shown in FIG. 7, in the state immediately after the completion of the procedure 4, the stopper member 60 is entirely stored in the stopper storage groove 40, and the stopper member 60 is inserted into the stopper engagement groove 56 of the rotary ring 50. This is because they are not engaged.

  In step 5, as indicated by an arrow 61 in FIG. 3, the knock pin 62 is inserted from the inner diameter side (the inner side in the radial direction) of the through hole 42 of the sleeve 34, and a part of the stopper member 60 is engaged with the stopper of the rotating ring 50. By engaging with the groove 56, the rotating ring 50 is fixed. In the present embodiment, as shown in FIG. 7, knock pins 62 are inserted into the four through holes 42 formed in the sleeve 34.

  FIG. 5 is a schematic cross-sectional view showing a state after the knock pin 62 is inserted. The knock pin 62 is inserted to a position where at least the rear end surface of the knock pin 62 substantially coincides with the sleeve inner peripheral surface 39 of the sleeve 34. Since the length of the knock pin 62 is designed to be at least longer than the length of the through hole 42, the tip of the knock pin 62 protrudes from the through hole 42 and protrudes into the stopper housing groove 40 communicating with the through hole 42.

  Therefore, the stopper member 60 stored in the stopper storage groove 40 is pushed and expanded to the outer diameter side by the knock pin 62. As a result, a part of the knock pin 62 is moved to the stopper engagement groove 56 of the rotating ring 50 disposed at a position facing the stopper storage groove 40 and is engaged with the stopper engagement groove 56.

  FIG. 8A is a cross-sectional view showing the state of the stopper member 60 after the knock pin 62 is inserted. As shown in FIG. 8A, the outer peripheral portion of the stopper member 60 that is close to the portion that is in contact with the knock pin 62 from the inner peripheral side is moved to the stopper engaging groove 56, and the stopper engaging groove 56 is engaged.

  As shown in FIG. 8B, which is a partially enlarged view of FIG. 8A, the knock pin 62 inserted into the sleeve 34 from the inside in the radial direction is the first end portion 62 a inserted into the through hole 42. And a second end 62 b that is disposed in the stopper housing groove 40 and contacts the stopper member 60. That is, the knock pin 62 inserted into the sleeve 34 supports the second portion 60b toward the outer side in the radial direction even when the second portion 60b tries to move toward the inner side in the radial direction. The engagement between the stopper 60 and the stopper engaging groove 56 can be maintained.

  However, the portion of the stopper member 60 that is separated from the knock pin 62 in the circumferential direction and the inner peripheral portion remain in the stopper housing groove 40 of the sleeve 34 even after the knock pin 62 is inserted. Thus, the stopper member 60 is engaged with the first portion 60a engaged with the stopper housing groove 40 of the sleeve 34 and the stopper engaging groove of the rotary ring 50 by inserting the knock pin 62. The second portion 60b is deformed.

  Even after the knock pin 62 is inserted, the stopper member 60 cannot move in the axial direction because the first portion 60a is engaged with the stopper engaging groove. The rotary ring 50 is prevented from moving inward in the axial direction by engaging the second portion 60 b of the stopper member 60 with the stopper engaging groove 56. Further, since the rotary ring 50 is prevented from moving outward in the axial direction by the rotary ring locking surface 36 of the sleeve 34, it does not move in any direction along the axial direction with respect to the sleeve 34. Fixed.

  In addition, it is preferable that the stopper member 60 is comprised with the soft material which contacts the knock pin 62 in the procedure 5, and plastically deforms. By using a soft material as the material of the stopper member 60, the load acting on the knock pin 62 to support the stopper member 60 toward the outer side in the radial direction is reduced. Further, since the force required to temporarily fix the knock pin 62 to the through hole 42 from when the knock pin 62 is inserted into the through hole 42 to when the sleeve 34 is inserted into the rotation shaft 70, such a force is reduced. The mechanical seal device 10 is further easy to assemble.

  The end 62b on the outer peripheral side of the knock pin 62 may be temporarily fixed to the through hole 42 with an adhesive or the like in order to prevent the knock pin 62 from falling off from the sleeve inner peripheral surface 39 side of the sleeve 34. . Further, as shown in FIG. 1, the knock pin 62 according to the present embodiment, after the sleeve 34 is fixed to the rotary shaft 70 with the rotary shaft 70 being held in, does not require any special fixing means. It does not fall out of the through hole 42. This is because the knock pin 62 is held in the through hole 42 by the inner peripheral surface of the stopper member 60 and the rotary shaft outer peripheral surface 70 a of the rotary shaft 70.

  In step 6, the cartridge type mechanical seal device 10 is assembled by combining the sleeve 34 (FIG. 5) to which the rotating ring 50 is fixed and the other parts constituting the mechanical seal 10. Specifically, for example, the sleeve 34 and the fixed ring 30 to which the rotary ring 50 is fixed are attached to the seal cover 12.

  In the mechanical seal device 10, the rotary ring 50 and the fixed ring 30 are each made of a material such as silicon carbide (silicon carbide, SiC), carbon, cemented carbide or the like. Preferably, the combination of the stationary ring 30 and the rotating ring 50 includes a combination of silicon carbide (SiC) and silicon carbide (SiC), a combination of carbon and silicon carbide (SiC), cemented carbide and cemented carbide, respectively. A combination or a combination of carbon and cemented carbide is preferred.

  The O-rings 18, 28, 44, and 46 of the mechanical seal device 10 are made of fluorine rubber, nitrile rubber, EPDM, perfluoroelastomer, or the like.

  As described above, the mechanical seal device 10 according to the present embodiment is compact without requiring a wide space in the axial direction and the radial direction in the fixing structure of the rotary ring 50. Further, in the mechanical seal device 10 according to the present embodiment, the rotary ring 50 does not move in the axial direction regardless of whether the inner space A is a positive pressure or a negative pressure with respect to the outer space B. Stable sealing characteristics can be obtained. Further, since the C-shaped stopper member 60 and the rotating ring 50 are in contact with each other, the contact area between the rotating ring 50 and the stopper member 60 is larger than in the technique of supporting the rotating ring with pins or the like, and the seal surface 52 is distorted. hard.

  Further, a through hole 42 is formed in the sleeve 34. By inserting a knock pin 62 into the through hole 42, the second portion 60b of the stopper member 60 is moved outward in the radial direction, and the second The portion 62 b can be engaged with the stopper engaging groove 56 of the rotating ring 50. That is, in the mechanical seal device 10 according to the present embodiment, before the rotary ring 50 is attached to the sleeve 34, the stopper member 60 is arranged in advance in the stopper storage groove 40 of the sleeve 34, and the rotary ring 50 is attached to the sleeve 34. After that, a part of the stopper member 60 can be engaged with the stopper engaging groove 56 of the rotating ring 50. Therefore, unlike the prior art, the mechanical seal device 10 according to this embodiment does not require the stopper member 60 to be inserted into the groove after the rotary ring 50 is attached to the sleeve 34, and is easy to assemble.

  In addition, since the mechanical seal device 10 according to the present embodiment does not require the stopper member 60 to be inserted into the groove after the rotary ring 50 is attached to the sleeve 34, the stopper member 60 is made of a plastic material. A wire that easily deforms can be used. This is because, in the prior art in which a wire must be inserted into the groove, a stiff (not easily plastically deformed) wire must be used, but this is not necessary in the mechanical seal device 10 according to the present embodiment. Furthermore, since the mechanical seal device 10 according to the present embodiment can use an inexpensive one as the stopper member 60, it is advantageous in terms of cost. This is because the mechanical seal device 10 according to the present embodiment does not strictly require the mechanical characteristics of the stopper member 60 as compared with the related art in which a wire must be inserted into the groove.

  However, the stopper member 60 is preferably made of a soft material that is plastically deformed in contact with the knock pin 62. By using a soft material as the material of the stopper member 60, the load acting on the knock pin 62 to support the stopper member 60 toward the outer side in the radial direction is reduced. Further, since the force required to temporarily fix the knock pin 62 to the through hole 42 from when the knock pin 62 is inserted into the through hole 42 to when the sleeve 34 is inserted into the rotation shaft 70, such a force is reduced. The mechanical seal device 10 is further easy to assemble.

  As shown in FIGS. 1 and 5, the stopper engaging groove 56 of the rotating ring 50 is preferably an L-shaped groove having a substantially L-shaped longitudinal section. By making the stopper engaging groove 56 into an L-shaped groove, the processing for forming the stopper engaging groove 56 in the rotating ring 50 becomes easier compared to a U-shaped groove or the like. If the stopper engaging groove 56 is an L-shaped groove, a jig is inserted into the stopper engaging groove 56 from the inside of the axial direction machine, and the second portion 60b of the stopper member 60 is inserted into the stopper receiving groove 40 of the sleeve 34. By pushing back to, the rotation of the rotating ring 50 can be released and the rotating ring 50 can be easily disassembled. For this reason, the mechanical seal device 10 according to the present embodiment is easy to disassemble and has excellent maintainability.

Second Embodiment FIG. 11 is a plan view (FIG. 11 (a)) and a longitudinal sectional view (FIG. 11 (b)) showing the shape of a rotary ring 80 included in a mechanical seal device according to a second embodiment of the present invention. It is. The mechanical seal according to the second embodiment is the same as the mechanical seal according to the first embodiment except that the structure related to the rotation stop of the rotary ring 80 is different. Therefore, description of portions other than the rotary ring 80 is omitted.

  As shown in FIG. 11, a stopper engagement groove 82 is formed on the inner surface 80 b of the rotating ring 80 as in the inner surface 50 b of the rotating ring according to the second embodiment. However, the stopper engaging groove 82 according to the second embodiment includes a straight portion 82a represented by a straight line in the cross section as shown in FIG.

  Similarly to the stopper engaging groove 56 according to the first embodiment, the L-shaped groove portion 82b of the stopper engaging groove 82 of the rotary ring 80 is engaged with the second portion 60b (FIG. 8A) of the stopper member 60. Combined. Further, the straight portion 82a in the rotary ring 80 according to the second embodiment also contacts the second portion 60b, and the rotary ring 82 moves in the rotational direction with respect to the sleeve 34 and the rotary shaft 70 (FIG. 1). To prevent.

  As described above, the straight portion 82a of the stopper engaging groove 82 rotates to prevent the rotation ring 80 from rotating with respect to the sleeve 34 by locking the second portion 60b of the stopper member 60 in the rotation direction. Can serve as a stop. Therefore, the mechanical seal device according to the second embodiment does not need to be separately provided with the sleeve engagement groove 54 that is a structure for stopping the rotation of the rotary ring 50 according to the first embodiment. Therefore, the mechanical seal device according to the second embodiment can simplify the fixing structure of the rotary ring 82 and is suitable for downsizing. The mechanical seal device according to the second embodiment has the same effect as the mechanical seal according to the first embodiment.

  The above-described embodiments are described for facilitating understanding of the present invention, and do not limit the present invention. Each element disclosed in the embodiments includes all design changes and equivalents belonging to the technical scope of the present invention, and various suitable modifications can be made.

  The present invention is applicable as a shaft seal device for a rotating shaft to any device having a rotating shaft. For example, it can be used for shaft seals such as centrifugal pumps and agitators.

DESCRIPTION OF SYMBOLS 10 ... Mechanical seal apparatus 30 ... Fixed ring 32 ... Fixed ring side sealing surface 34 ... Sleeve 36 ... Rotating ring latching surface 38 ... Sleeve outer peripheral surface 39 ... Sleeve inner peripheral surface 40 ... Stopper storage groove 42 ... Through-hole 50, 80 ... Rotating ring 50b ... Rotating ring inner peripheral surface 52 ... Rotating ring side seal surface 56 ... Stopper engaging groove 60 ... Stopper member 60a ... First portion 60b ... Second portion 62 ... Knock pin 62a ... First end 62b ... Second end portion 70 ... Rotating shaft 82a ... Stopper engagement groove straight portion

Claims (5)

A rotating ring side seal surface formed on at least one surface in the axial direction of the rotating shaft, and an inner peripheral surface that is a surface facing the rotating shaft and has a stopper engaging groove formed thereon, A rotating ring installed on the rotating shaft so as to rotate integrally with the rotating shaft;
A stationary ring including a stationary ring side sealing surface that slides in close contact with the rotating ring side sealing surface;
A rotating ring locking surface that is fixed to the rotating shaft and locks the rotating ring from the outside or the inside of the machine in the axial direction, and a stopper storage groove that is disposed so as to face the stopper engaging groove. An outer peripheral surface formed, and a sleeve in which a radial through hole communicating with the stopper storage groove is formed;
A first portion engaged with the stopper receiving groove of the sleeve; and a second portion engaged with the stopper engaging groove of the rotating ring, and having a substantially C-shaped outer shape. A stopper member;
One end portion inserted into the through hole and the other end portion disposed in the stopper storage groove and contacting the stopper member, and the second portion of the stopper member is disposed in the radial direction. A knock pin that supports the outside,
A mechanical seal device comprising:   The mechanical seal device according to claim 1, wherein the stopper engaging groove of the rotating ring is an L-shaped groove having a substantially L-shaped longitudinal section.   The mechanical seal device according to claim 1, wherein the stopper engaging groove of the rotating ring includes a straight portion represented by a straight line in a cross section.   The mechanical seal device according to any one of claims 1 to 3, wherein the stopper member is made of a soft material that is plastically deformed in contact with the knock pin. A rotating ring fixing method used in a mechanical seal device,
A rotating ring locking surface that can be fixed to the rotating shaft and that locks the rotating ring from the outside or inside of the machine in the axial direction of the rotating shaft, and a surface that faces the rotating ring, and a stopper storage groove is formed. An outer peripheral surface, and a step of preparing a sleeve in which a radial through hole communicating with the stopper storage groove is formed;
A procedure for installing a stopper member having a substantially C-shaped outer shape in the stopper receiving groove of the sleeve;
A rotating ring side seal surface formed on at least one surface of the rotating shaft in the axial direction, and a stopper engaging groove disposed on the surface facing the rotating shaft and facing the stopper storing groove. A step of locking the rotating ring including the inner peripheral surface formed with the rotating ring locking surface of the sleeve;
The stopper member is inserted into the through hole of the sleeve from the inside in the radial direction, and the tip of the knock pin projects from the through hole into the stopper housing groove to push the stopper member outward in the radial direction. Engaging a part of the rotary engaging ring with the stopper engaging groove of the rotating ring;
Including fixing method.

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