JP6353778B2 - Mechanical seal support device - Google Patents

Description

  The present invention relates to a support device for a mechanical seal.

  Patent Document 1 discloses a mechanical seal that is disposed on a portion of a rotating shaft of a fluid machine such as a pump that protrudes from the fluid machine to the outside. The mechanical seal includes a housing through which the rotation shaft passes, and a sleeve disposed on the rotation shaft so as to be positioned in the through hole of the housing. The mechanical seal includes a rotating ring fixed to the sleeve and a fixed ring fixed to the housing. The rotating ring rotates integrally with the rotating shaft via the sleeve. A contact portion between the rotating ring and the fixed ring constitutes a sliding surface that seals the inside and the outside.

  The sleeve on which the rotating ring is arranged is prevented from rotating in the circumferential direction with respect to the rotating shaft, but is movable in the axial direction. During the operation of the fluid machine, since the pressure on the inner side of the housing becomes higher than the pressure on the outer side, a thrust force in the direction along the rotation axis acts on the sleeve. This thrust force increases when the pressure at the shaft seal is high or when the diameter of the rotating shaft is large. Therefore, in the worst case, liquid leakage may occur between the rotating ring and the stationary ring. However, Patent Document 1 does not describe any countermeasure against the thrust force generated during operation.

Japanese Patent Application Laid-Open No. 2014-88956

  An object of the present invention is to provide a support device for a mechanical seal that can resist a thrust force during operation.

  The present invention has a housing in which a rotation shaft is rotatably penetrated, and extends from the inside of the housing to the outside of the housing. The rotation shaft is non-rotatable in the circumferential direction and is movable in the axial direction A mechanical seal supporting device including a protective member arranged, wherein the first fixing portion is provided on an outer peripheral portion of the rotating shaft so as to be located outside the housing, and is located outside the housing. A second fixing portion that is provided on an outer peripheral portion of the protection member and is spaced apart from the first fixing portion in an axial direction of the rotating shaft; and one end side of the first fixing portion is disposed on the second fixing portion. A support device for a mechanical seal, comprising: a fixing member, the other end side of which is disposed on a fixing portion, and a fastening member that is engaged to adjust an interval between the first and second fixing portions. In the present invention, the first fixed portion provided on the outer peripheral portion of the rotating shaft refers to the outer peripheral portion of the fixed sleeve when the outer peripheral portion of the rotating shaft has a fixed sleeve that is not movable in the circumferential direction and cannot be axially moved. The structure to provide is included. That is, the member fixed integrally with the rotating shaft is regarded as a part of the rotating shaft.

  In this support device, a first fixing portion provided on the rotating shaft and a second fixing portion provided on the protection member are engaged with a fastening member so that the interval can be adjusted, outside the housing. At the time of assembly, by adjusting the tightening amount of the tightening member, it is possible to adjust the mounting position of the protective member that can move in the axial direction with respect to the rotating shaft. Further, when a thrust force along the axis of the rotating shaft acts on the protection member during operation, the thrust force is transmitted from the second fixing portion provided on the protection member to the first fixing portion via the tightening member. And since the 1st fixing | fixed part is provided in the rotating shaft, it can oppose reliably the thrust force which acts on a protection member. Therefore, the reliability regarding a mechanical seal can be improved.

  The first fixing portion is a split ring that is separate from the rotary shaft, and a positioning recess is provided on one of the rotary shaft and the split ring, a positioning convex is provided on the other, and the positioning recess is provided with the positioning A projection is fitted to position the split ring on the rotating shaft. In this way, the configuration of the rotating shaft and the first fixed portion can be simplified, and therefore it can be manufactured easily and reliably. Further, since the rotating shaft and the first fixed portion are assembled by the engagement of the positioning concave portion and the positioning convex portion, the thrust force in the direction along the axis can be reliably countered.

  The split ring is divided into two or more, and the positioning concave portion and the positioning convex portion are formed in an annular shape extending in the circumferential direction. If it does in this way, the assembly workability of the split ring which is the 1st fixed part to a rotating shaft can be improved. In addition, since the positioning concave portion and the positioning convex portion are formed in an annular shape, a large engagement area can be secured. Therefore, the thrust force along the axial direction of the rotating shaft can be reliably countered.

  The tightening member includes a bolt that penetrates the first fixing portion from the opposite side of the housing, and a nut that is screwed into the bolt and contacts the surface of the first fixing portion on the housing side. In this way, it is possible to reliably counter the thrust force of the rotating shaft applied from the inner side to the outer side of the housing. The nut is a locking nut. In this way, displacement of the nut position relative to the bolt can be prevented.

  The support device for a mechanical seal of the present invention can improve the assembly workability because the axial mounting position of the protection member relative to the rotating shaft can be adjusted by tightening the tightening member. Moreover, since the rotating shaft and the protective member are engaged via the first and second fixing portions, it is possible to counter the thrust force along the axis of the rotating shaft that acts on the protective member during operation. Therefore, the reliability regarding a mechanical seal can be improved.

Sectional drawing of the mechanical seal using the support apparatus of 1st Embodiment. The disassembled perspective view of a support apparatus. Sectional drawing which shows a 1st assembly process. Sectional drawing which shows a 2nd assembly process. Sectional drawing which shows a 3rd assembly process. Sectional drawing of the support apparatus of 2nd Embodiment. The front view of the support apparatus of 3rd Embodiment. Sectional drawing of the support apparatus of 3rd Embodiment. The front view of the support apparatus of 4th Embodiment. Sectional drawing of the support apparatus of 4th Embodiment. Sectional drawing of the mechanical seal using the support apparatus of 5th Embodiment. Sectional drawing of the support apparatus of 6th Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 shows a mechanical seal 10 using a support device 40 according to a first embodiment of the present invention. The mechanical seal 10 is disposed in a portion of the casing 2 of the fluid machine (for example, the pump 1) through which the rotary shaft 3 is penetrated, and prevents an internal liquid (for example, pumped water) from leaking to the outside (atmosphere side). The mechanical seal 10 includes a housing 11 that is fixed to the casing 2 and a sleeve 20 that is disposed on the outer peripheral portion of the rotary shaft 3. The support device 40 according to the present invention makes it possible to finely adjust the mounting position of the rotary shaft 3 and the sleeve 20 along the axis L of the rotary shaft 3, and also to the thrust force acting on the sleeve 20 during the operation of the pump 1. Oppose.

(Details of mechanical seal)
As shown in FIG. 1, the housing 11 of the mechanical seal 10 includes a through hole 12 through which the rotary shaft 3 passes so as to extend from the inside to the outside. The housing 11 is provided with a water injection portion 14 for injecting water from the outside in order to increase the internal pressure when the pump 1 is started. Further, the housing 11 is provided with an exhaust part 15 for discharging air when water is injected.

  The sleeve 20 is a cylindrical protective member disposed on the outer peripheral portion of the rotary shaft 3 so as to extend from the inside of the housing 11 to the outside of the housing 11 through the through hole 12. An O-ring (seal part) 21 that seals between the sleeve 20 and the rotary shaft 3 is disposed on the inner peripheral part of the sleeve 20. On the outer peripheral portion of the rotary shaft 3, key grooves 4 that are recessed in the radial direction and extending in the axial direction are provided at predetermined intervals in the circumferential direction. The sleeve 20 is provided with a key groove 22 corresponding to the key groove 4. The key groove 22 is opened at one end surface of the sleeve 20. A square columnar key 23 is arranged in the key grooves 4 and 22. The key 23 is a rotation-preventing member that restricts the circumferential movement of the sleeve 20 relative to the rotation shaft 3 and prevents the rotation. Thereby, the sleeve 20 is integrally rotated by the rotation of the rotating shaft 4. However, the sleeve 20 is movable along the axis L of the rotary shaft 4 because the key groove 22 is a concave groove extending in the axial direction and opening at one end surface. In addition, the restriction mechanism that prevents the rotation of the sleeve 20 with respect to the rotation shaft 3 so as not to rotate in the circumferential direction and that can be moved in the axial direction is not limited to the combination of the key grooves 4 and 22 and the key 23. Changes can be made accordingly.

  An annular sealing liquid chamber 16 filled with a sealing liquid is formed between the casing 2 closed by the housing 11 and the sleeve 20. A flange portion 24 that protrudes radially outward is provided at the inner end of the sleeve 20 so as to be located in the sealing liquid chamber 16. A holder 30 is disposed on the flange portion 24, and a rotating ring 32 is disposed inside the holder 30. A spring 34 is disposed between the holder 30 and the rotating ring 32 to urge the rotating ring 32 toward the outside. Thereby, the rotary ring 32 is disposed so as to be non-rotatable in the circumferential direction and movable in the axial direction with respect to the holder 30. The rotary ring 32 rotates integrally with the rotary shaft 3 via the sleeve 20. A stationary ring 36 is disposed inside the housing 11. The stationary ring 36 is disposed so as not to rotate in the circumferential direction. The rotating ring 32 is elastically pressed against the inner end of the fixed ring 36. A contact portion between the rotating ring 32 and the fixed ring 36 is a sliding surface 38 that seals the inside and the outside of the sealing liquid chamber 16.

(Details of support device)
As shown in FIGS. 1 and 2, the support device 40 is disposed so as to be located outside the housing 11. Specifically, the split ring (first fixing portion) 42 provided on the outer peripheral portion of the rotating shaft 3, the collar (second fixing portion) 50 provided on the outer peripheral portion of the sleeve 20, and the tightening arranged over these. And a member 56.

  As shown in FIG. 2, the split ring (split ring) 42 is divided into two or more (two in this embodiment) divided bodies 43A and 43B. The divided bodies 43 </ b> A and 43 </ b> B have the same inner diameter as the outer diameter of the rotating shaft 3. The thickness in the direction along the axis L of the divided bodies 43A and 43B is a dimension setting having a strength set with respect to the force in the direction along the axis L. An annular positioning recess 5 that is recessed in the radial direction and extending in the circumferential direction is provided on the outer peripheral portion of the rotating shaft 3. The split bodies 43A and 43B are provided with annular positioning convex portions 44 that protrude inward in the radial direction and extend in the circumferential direction. The positioning convex part 44 protrudes from the inner peripheral part of the end opposite to the housing 11 of the divided bodies 43A and 43B.

  One end of each of the divided bodies 43A and 43B is provided with an insertion hole 45 through which a bolt 48 with a hexagonal hole, which is a first fixing member, is inserted. In addition, a bolt hole 46 is provided at the other end of each of the divided bodies 43A and 43B. The divided bodies 43 </ b> A and 43 </ b> B are arranged on the outer peripheral portion of the rotating shaft 3, and the positioning convex portion 44 is fitted into the positioning concave portion 5. Thereafter, the bolt 48 is tightened into the first bolt hole 46 through the insertion hole 45. Thereby, the split ring 42 can be positioned and fixed at a predetermined position on the axis L of the rotary shaft 3. The divided bodies 43A and 43B are provided with two insertion holes 47 and 47, respectively. The insertion hole 47 is provided so as to extend in parallel along the axis L of the rotation shaft 3.

  As shown in FIGS. 1 and 2, the collar 50 is fixed to the housing 11 side with an interval along the axis L of the rotation shaft 3 with respect to the split ring 42. The collar 50 is an annular ring having the same inner diameter as the outer diameter of the rotating shaft 3, and includes a stepped portion 51 fitted to the outer end of the sleeve 20 on one end side in the axial direction. On the outer peripheral surface of the end portion of the sleeve 20, a locking recess 25 is provided that is recessed in the radial direction with a predetermined interval in the circumferential direction. The collar 50 is provided with a bolt hole 52 corresponding to the locking recess 25 so as to open at the stepped portion 51. The collar 50 is fitted on the outer end of the sleeve 20, and a hexagon socket set screw (set bolt) 53, which is a second fixing member, is locked to the locking recess 25 through the bolt hole 52. Thereby, the collar 50 can be positioned and fixed to the sleeve 20. The collar 50 is provided with bolt holes 54 corresponding to the insertion holes 47 of the split ring 42 with a predetermined interval in the circumferential direction.

  One end (head 57a) side of the tightening member 56 is disposed on the split ring 42, and the other end (shaft portion 57b) side is disposed on the collar 50. To do. The tightening member 56 includes a bolt 57 including a hexagonal head portion 57a as viewed along the axial direction and a shaft portion 57b formed with a thread. The bolt 57 passes through the insertion hole 47 of the split ring 42 from the surface opposite (separated) from the housing 11. The distance between the split ring 42 and the collar 50 can be adjusted by screwing and tightening the shaft portion 57 b into the bolt hole 54 of the collar 50.

  The tightening member 56 includes a nut 58 that is screwed into the shaft portion 57 b of the bolt 57 and abuts against the opposing surface of the split ring 42 on the housing 11 side. The nut 58 includes a first nut 59 and a second nut 60, and is a locking nut that suppresses the loosening of the first nut 59 by a wedge action. The first nut 59 is screwed into the shaft portion 57b so as to abut against the opposing surface of the split ring 42. The first nut 59 is provided with a frustoconical fitting convex portion 59 a that protrudes toward the collar 50. The second nut 60 is screwed to the shaft portion 57 b so as to overlap the first nut 59. The second nut 60 is provided with a fitting recess 60a into which the fitting protrusion 59a is fitted on the surface on the split ring 42 side.

  When the support device 40 is assembled to the rotating shaft 3 and the sleeve 20, first, the sleeve 20 is disposed on the outer peripheral portion of the rotating shaft 3. Specifically, the key 23 is disposed in the key groove 4 of the rotating shaft 3, and the sleeve 20 fitted to the outer peripheral portion of the rotating shaft 3 is moved along the rotating shaft 3. Then, the key groove 22 is fitted to the key 23 protruding from the rotary shaft 3. Thereby, the sleeve 20 is attached to the rotating shaft 3 so as not to rotate in the circumferential direction.

  Next, as shown in FIG. 3A, the collar 50 is disposed with respect to the sleeve 20, and the set screw 53 is screwed to fix the sleeve 20 and the collar 50. Next, the bolt 57 is inserted into the insertion hole 47 of the split ring 42, and the first nut 59 and the second nut 60 are temporarily fixed to the tip end side of the shaft portion 57 b of the bolt 57.

  Next, as shown in FIG. 3B, the positioning convex portion 44 of the split ring 42 is fitted into the positioning concave portion 5 of the rotating shaft 3, and the shaft portion 57 b of the bolt 57 is screwed into the bolt hole 54 of the collar 50. At this time, since the split ring 42 is composed of divided parts 43A and 43B, the split ring 42 can be easily arranged at a predetermined position of the rotating shaft 3. Further, since the split ring 42 is a split ring separate from the rotary shaft 3, the configuration can be simplified, and the split ring 42 can be easily and reliably manufactured.

  In this state, the sleeve 20 cannot be rotated in the circumferential direction with respect to the rotating shaft 3 by the engagement of the key groove 22 and the key 23, but can be moved in the axial direction. Therefore, by adjusting the tightening amount of the bolt 57, the position of the rotating ring 32 arranged on the sleeve 20 with respect to the fixed ring 36 arranged on the housing 11 (the urging force of the spring 34) can be adjusted.

  When the distance between the split ring 42 and the collar 50 is adjusted by tightening the bolt 57, the first nut 59 is rotated and brought into contact with the split ring 42 as shown in FIG. 3C. Thereafter, the second nut 60 is rotated and brought into contact with the first nut 59, and is tightened so that the fitting convex portion 59a and the fitting concave portion 60a are fitted with a predetermined pressure contact force.

  Thus, the collar 50 is fixed to the sleeve 20, the split ring 42 is fixed to the rotary shaft 3, and these are fastened by the fastening member 56, so that the mounting position of the sleeve 20 with respect to the rotary shaft 3 can be easily adjusted. Since it can be fixed, assembly workability can be improved. Of course, workability at the time of disassembly can also be improved.

  As shown in FIG. 1, in the mechanical seal 10 in which the support device 40 is arranged, when the rotary shaft 3 of the pump 1 is rotated, the rotary ring 32 rotates together via the sleeve 20. As a result, the rotating ring 32 and the stationary ring 36 are in sliding contact with each other, and the sealing surface 38 causes the sealing liquid in the casing 2 to flow from the radially outer side to the inner side with respect to the axis L of the rotating shaft 3. Prevent leakage to the side.

  While the pump 1 is being driven, the pressure inside the housing 11 becomes higher than the pressure outside the housing 11. Therefore, a thrust force acts on the sleeve 20 that can move along the axis L with respect to the rotating shaft 3 so as to move to the outside. This thrust force increases when the pressure in the sealing liquid chamber (shaft seal portion) 16 is high or when the diameter of the rotary shaft 3 is large.

  On the other hand, in the present embodiment, the split ring 42 is fixed to the rotary shaft 3 and the collar 50 is fixed to the sleeve 20 outside the housing 11, and these are fastened by the fastening member 56. Therefore, the thrust force acting on the sleeve 20 is transmitted from the collar 50 fixed to the sleeve 20 to the split ring 42 via the tightening member 56. And since the split ring 42 is being fixed to the rotating shaft 3, it can oppose the thrust force which acts on the sleeve 20 reliably, and can prevent the movement of the sleeve 20. FIG. Therefore, since the liquid leakage of the pumped water caused by the thrust force acting can be surely prevented, the reliability related to the mechanical seal can be improved.

  Further, since the positioning concave portion 5 of the rotating shaft 3 and the positioning convex portion 44 of the split ring 42 are formed in an annular shape, a large engagement area can be ensured. Therefore, it is possible to reliably counter the thrust force in the direction along the axis L of the rotating shaft 3. Moreover, since the tightening member 56 includes the nut 58 that abuts against the opposing surface of the split ring 42, it can reliably resist the thrust force of the rotating shaft 3 applied from the inner side to the outer side of the housing 11. In addition, since the nut 58 is composed of a locking nut, the displacement (loosening) of the position of the nut 58 can be prevented.

(Second Embodiment)
FIG. 4 shows a support device 40 of the mechanical seal 10 of the second embodiment. This second embodiment is different from the first embodiment in that the positioning convex portion 44 protrudes from the inner peripheral portion of the end of the split ring 42 on the housing 11 side. In the second embodiment, it is possible to obtain the same operation and effect as the first embodiment. Moreover, in the second embodiment, since the gap (interval) formed between the split ring 42 and the collar 50 can be reduced, the support device 40 can be downsized.

(Third embodiment)
5A and 5B show a support device 40 for the mechanical seal 10 of the third embodiment. The third embodiment is different from the first embodiment in that the pair of split bodies 43A and 43B constituting the split ring 42 are not connected to each other by the bolt 48. In the third embodiment thus configured, the split ring 42 and the collar 50 are engaged with each other by the tightening member 56 as in the first embodiment, so that the assembled state can be reliably maintained. Therefore, the same operations and effects as those in the first embodiment can be obtained.

(Fourth embodiment)
6A and 6B show a support device 40 for the mechanical seal 10 of the fourth embodiment. The fourth embodiment is different from the first embodiment in that the pair of split bodies 43A and 43B constituting the split ring 42 are fixed by an annular ring member 65 instead of the bolt 48. In the fourth embodiment, the split ring 42 composed of the divided bodies 43A and 43B can be reliably fixed as in the first embodiment. Therefore, the same operations and effects as those in the first embodiment can be obtained.

(Fifth embodiment)
FIG. 7 shows a support device 40 of the mechanical seal 10 of the fifth embodiment. In the fifth embodiment, the support device 40 is largely applied to the first embodiment in that the support device 40 is applied to a mechanical seal 10 different from that shown in FIG.

  In detail, the mechanical seal 10 of 5th Embodiment is provided with the housing 11 fixed to the casing 2 similarly to 1st Embodiment. The housing 11 includes a through hole 12 that allows the rotary shaft 3 to pass therethrough in a rotatable manner. In the housing 11 of the second embodiment, a seal portion 17 that is a space (arrangement portion) in which the rotating ring 32 and the stationary ring 36 are arranged is formed so as to open to the outside.

  The sleeve 20 is disposed on the rotary shaft 3 so as to be positioned inside the seal portion 17. An O-ring 21 that seals between the sleeve 20 and the rotary shaft 3 is disposed on the inner peripheral portion of the sleeve 20. The sleeve 20 is arranged so as to be non-rotatable in the circumferential direction with respect to the rotary shaft 3 and movable in the axial direction by a key groove 22 formed in the inner peripheral portion and a key 23 arranged in the rotary shaft 3. .

  The support device 40 includes a split ring 42 that is a first fixing portion that is positioned by fitting a positioning convex portion 44 to the positioning concave portion 5 of the rotating shaft 3. The collar 50 that is the second fixing portion is provided integrally with the sleeve 20. The collar 50 is formed with an outer diameter that closes the opening of the seal portion 17 of the housing 11. The stationary ring 36 is disposed in the housing 11 and the rotating ring 32 is disposed in the sleeve 20 so as to be located in the seal portion 17. The rotating ring 32 is in sliding contact with the fixed ring 36 by the rotation of the rotating shaft 3, and the sealing liquid in the casing 2 flows from the inner side to the outer side in the radial direction with respect to the axis L of the rotating shaft 3 by the sliding surface 38. This prevents leakage to the atmosphere side through the through hole 12.

  The support device 40 of the mechanical seal 10 of the fifth embodiment thus configured can obtain the same operations and effects as those of the respective embodiments. Thus, the support device 40 of the present invention is applicable to various mechanical seals 10. In other words, the support device 40 of the present invention is applicable to any mechanical seal 10 that includes the housing 11 through which the rotary shaft 3 is rotatably penetrated and the sleeve 20 disposed so as to extend from the inside of the housing 11 to the outside of the housing 11. It is possible, and the same operation and effect can be obtained.

(Sixth embodiment)
FIG. 8 shows a support device 40 of the mechanical seal 10 of the sixth embodiment. In the sixth embodiment, a fixed sleeve 70 fixed to the outer peripheral portion of the rotary shaft 3 so as to be immovable in the circumferential direction and immovable in the axial direction is disposed, and the mechanical seal 10 and the outer periphery of the fixed sleeve 70 are arranged. The fifth embodiment is different from the fifth embodiment in that the support device 40 is arranged.

  A plurality of fixing holes 71 penetrating in the radial direction are provided in the fixing sleeve 70 at predetermined intervals in the circumferential direction. The rotating shaft 3 is provided with a bolt hole 6 extending in the radial direction. The fixing hole 71 of the fixing sleeve 70 is aligned with the bolt hole 6 and the set bolt 72 is inserted therethrough. As a result, the fixed sleeve 70 is integrally fixed to the rotating shaft 3. Thus, the fixed sleeve 70 provided integrally with the rotary shaft 3 is a part of the rotary shaft 3. The fixing sleeve 70 is formed with a positioning recess 5 for fitting and positioning the positioning protrusion 44 of the split ring 42.

  The support device 40 of the mechanical seal 10 of the sixth embodiment thus configured can obtain the same operations and effects as those of the embodiments.

  In addition, the support apparatus of the mechanical seal of this invention is not limited to the structure of the said embodiment, A various change is possible.

  For example, in the first to fourth embodiments, the separate collar 50 is fixed to the sleeve 20. However, as in the fifth and sixth embodiments, the second fixing portion corresponding to the collar 50 is integrally formed on the sleeve 20. It may be formed. The positioning recess 5 and the positioning protrusion 44 of the rotating shaft 3 and the split ring 42 are provided in an annular shape that is continuous in the circumferential direction. Good. Further, although the positioning recess 5 is provided on the rotating shaft 3 and the positioning projection 44 is provided on the split ring 42, the positioning projection 44 may be provided on the rotating shaft 3 and the positioning recess 5 may be provided on the split ring 42. In addition, a first fixing portion corresponding to the split ring 42 may be integrally provided on the rotating shaft 3. In the first to fourth embodiments, the split ring 42 is arranged directly on the rotary shaft 3, but may be arranged via a fixed sleeve 70 shown in the sixth embodiment. In addition, the first fixing portion corresponding to the split ring 42 and the second fixing portion corresponding to the collar 50 are not limited to an annular shape, and are configured by protrusions protruding outward in the radial direction with a predetermined interval in the circumferential direction. May be. In addition, the split ring 42 is configured by the two divided bodies 43A and 43B, but may be formed by three or more divided bodies.

  The fastening member 56 has a nut 58 made of a locking nut arranged on the opposing surface of the split ring 42, but a pair of general-purpose nuts (a double nut with no fitting convex portion 59a and no fitting concave portion 60a formed). ) May be used. The nut 58 may be a single general purpose nut. A washer may be used to prevent loosening. The tightening member 56 is not limited to the configuration including the bolts 57 and the nuts 58, but can be configured to adjust the interval between the first fixing portion corresponding to the split ring 42 and the second fixing portion corresponding to the collar 50. If there is, it can be changed as desired.

1 ... Pump (fluid machine)
DESCRIPTION OF SYMBOLS 2 ... Casing 3 ... Rotating shaft 4 ... Key groove 5 ... Positioning recessed part 6 ... Bolt hole 10 ... Mechanical seal 11 ... Housing 12 ... Through-hole 14 ... Water injection part 15 ... Exhaust part 16 ... Sealing liquid chamber 17 ... Seal part 20 ... Sleeve (protective member)
21 ... O-ring (seal member)
DESCRIPTION OF SYMBOLS 22 ... Key groove 23 ... Key 24 ... Flange part 25 ... Locking recessed part 30 ... Holder 32 ... Rotating ring 34 ... Spring 36 ... Fixed ring 38 ... Sliding surface 40 ... Supporting device 42 ... Split ring (1st fixing part)
43A, 43B ... Divided body 44 ... Positioning convex part 45 ... Insertion hole 46 ... Bolt hole 47 ... Insertion hole 48 ... Bolt 50 ... Collar (second fixing part)
51 ... Step 52 ... Bolt hole 53 ... Set screw 54 ... Bolt hole 56 ... Tightening member 57 ... Bolt 57a ... Head 57b ... Shaft part 58 ... Nut (loosening prevention nut)
59 ... first nut 59a ... fitting convex portion 60 ... second nut 60a ... fitting concave portion 65 ... ring member 70 ... fixing sleeve 71 ... fixing hole 72 ... set bolt

Claims (5)

A housing through which a rotating shaft is rotatably passed;
A support device for a mechanical seal, comprising: a protective member that extends from the inside of the housing to the outside of the housing, is non-rotatable in the circumferential direction with respect to the rotation shaft, and is disposed so as to be movable in the axial direction. ,
A first fixing portion provided on an outer peripheral portion of the rotating shaft so as to be located outside the housing;
A second fixing portion that is provided on an outer peripheral portion of the protection member located outside the housing, and is positioned at an interval from the first fixing portion in the axial direction of the rotating shaft;
A mechanical seal comprising: a fastening member having one end side disposed on the first fixing portion and the other end side disposed on the second fixing portion, and an engagement between the first fixing portion and the second fixing portion so as to be adjustable. Support device.   The first fixing portion is a split ring that is separate from the rotary shaft, and a positioning recess is provided on one of the rotary shaft and the split ring, a positioning convex is provided on the other, and the positioning recess is provided with the positioning The mechanical seal support device according to claim 1, wherein a projection is fitted to position the split ring on the rotation shaft.   The mechanical seal support device according to claim 2, wherein the split ring is divided into two or more, and the positioning recess and the positioning protrusion are formed in an annular shape extending in a circumferential direction.   The tightening member includes a bolt penetrating from the opposite side to the housing with respect to the first fixing portion, and a nut that is screwed into the bolt and contacts the surface of the first fixing portion on the housing side. The mechanical seal support device according to any one of claims 1 to 3.   The mechanical nut support device according to claim 4, wherein the nut is a locking nut.

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