JP6257250B2 - mechanical seal - Google Patents

Description

  The present invention relates to a mechanical seal used in a fluid machine that handles a high-temperature fluid such as boiler feed water and that requires forced cooling.

  The mechanical seal includes a housing through which a rotating shaft of a fluid machine such as a pump passes. A driven ring (rotating ring) that is fixed to the rotating shaft and rotates integrally is disposed in the housing, and a seat ring (fixed ring) that is pressed along the axial direction is disposed. ing. In these outer peripheral portions, a sealing liquid chamber filled with a sealing liquid (pumped water) for removing frictional heat between the driven ring and the seat ring is formed.

  In this mechanical seal, when the pumping temperature supplied by the fluid machine is high, it is necessary to forcibly cool and circulate the sealing liquid made of the pumped water and to remove the frictional heat between the driven ring and the seat ring. Therefore, in Patent Document 1, a heat exchange chamber is provided on the outer periphery of the sealing liquid chamber, and the coolant is circulated and supplied from the outside of the housing into the heat exchange chamber. In addition, a cooling tube is disposed in the heat exchange chamber, and the sealing liquid is forcedly cooled by circulating the sealing liquid in the sealing liquid chamber through the cooling tube.

  However, the heat exchange chamber of the mechanical seal of Patent Document 1 forms a sealing liquid inflow passage that extends in the radial direction from the sealing liquid chamber and an opening, and a sealing liquid outflow passage that extends in the axial direction and opens, Further, the cooling liquid inflow path and the cooling liquid outflow path for circulating the cooling liquid are formed so as to extend from the radially outer side of the housing. As a result, the cooling tube disposed inside the heat exchange chamber has a complicated shape in which a pipe is wound so as to form a spiral shape and a second winding portion is further provided on the inside thereof. There is a problem of being bad. In addition, since it is necessary to dispose a cooling tube having a complicated shape in a heat exchange chamber having a complicated shape, there is a problem that workability during assembly and maintenance is poor.

JP-A-11-82754

  It is an object of the present invention to provide a mechanical seal that simplifies a heat exchange chamber and a cooling member for forced cooling and can improve workability during assembly and maintenance.

  In order to solve the above-mentioned problems, a mechanical seal of the present invention is fixed to a casing of a fluid machine, passes through a rotating shaft of the fluid machine, and is rotatably disposed in the housing. A rotating ring that rotates integrally, a fixed ring that is non-rotatably disposed in the housing and forms a sliding surface by contacting the rotating ring, and a seal formed on the outer periphery of the rotating ring A liquid chamber, an annular heat exchange chamber formed in an outer peripheral portion of the sealing liquid chamber, a sealing liquid inflow passage and a sealing liquid outflow passage for communicating the sealing liquid chamber and the heat exchange chamber, A cooling liquid inflow path and a cooling liquid outflow path, which are communicated with the heat exchange chamber and circulate and supply the cooling liquid outside the housing, and are disposed in the heat exchange chamber and sealed from the sealing liquid inflow path The liquid and the cooling liquid from the cooling liquid inflow path are partitioned and flowed A cylindrical cooling member, has a configuration comprising, a circulation means for circulating a sealing liquid from said sealing liquid inlet passage through the cooling member and the sealing fluid outflow passage to the sealing liquid chamber.

  In this mechanical seal, the sealing liquid and the cooling liquid are partitioned and flowed by a substantially cylindrical cooling member in the heat exchange chamber. Thereby, the hot sealing liquid is cooled by the cooling liquid. Moreover, since the cooled sealing liquid is supplied to the sealing liquid chamber, the frictional heat of the rotating ring and the stationary ring can be reliably removed by the sealing liquid. Moreover, since the heat exchange chamber has a simplified configuration, the cooling member disposed in the heat exchange chamber can also be simplified. Therefore, workability during assembly and maintenance can be improved.

Specifically, in the first aspect of the present invention, the cooling member is configured to cause one of the sealing liquid and the cooling liquid to flow in the radial direction and the other to flow in the axial direction in the heat exchange chamber.
  In the second aspect of the present invention, the cooling member has a cylindrical shape that is liquid-tightly arranged in the heat exchange chamber, and either the sealing liquid or the cooling liquid flows. And a second flow path through which either the sealing liquid or the cooling liquid flows.
  Furthermore, in the third aspect of the present invention, the cooling member has a substantially cylindrical shape constituted by a plurality of divided units, and each of the divided units has a first flow of either a sealing liquid or a cooling liquid. A second flow path that has one flow path and in which either the sealing liquid or the cooling liquid flows is formed between the adjacent divided units in the heat exchange chamber. In this third aspect, each of the divided units has a sector shape, and the first flow path is formed with the sealing liquid inflow path or the cooling liquid inflow path that opens at one end side in the axial direction of the heat exchange chamber. It is preferable that the sealing liquid outflow path or the cooling liquid outflow path that opens at the other end side in the axial direction of the heat exchange chamber is connected.

In this mechanical seal, the sealing liquid inflow path and the sealing liquid outflow path are opened at one end side and the other end side in either the axial direction or the radial direction of the heat exchange chamber, and the cooling liquid It is preferable that the inflow path and the coolant outflow path are opened at one end side and the other end side in either the axial direction or the radial direction of the heat exchange chamber. Here, the one end side and the other end side in the radial direction include both an inner peripheral portion and an outer peripheral portion that are both ends of the radius and each outer peripheral portion that is both ends of the diameter in the annular heat exchange chamber. In this way, the heat exchange chamber can be reliably simplified and can be reliably flowed so that the sealing liquid and the cooling liquid intersect.

The sealing liquid inflow path is opened at a position away from the sliding surface of the sealing liquid chamber, and the sealing liquid outflow path is opened at a position close to the sliding surface of the sealing liquid chamber. It is preferable. If it does in this way, the sealing liquid cooled through the heat exchange chamber can be supplied to the sliding surface where frictional heat is generated most, and it can cool efficiently.
Further, it is preferable that a cooling liquid chamber communicating with the cooling liquid inflow path is further provided on the outer periphery of the stationary ring. In this way, the housing and the stationary ring can be reliably cooled by using the coolant as well.

  And the said housing is provided with the housing main body fixed to the said casing, and the cover which obstruct | occludes the casing opposite to the said casing of the said housing main body, from the said sealing liquid inflow path and the said sealing liquid outflow path It is preferable that a part of the sealing liquid flow path and a part of the cooling liquid flow path including the cooling liquid inflow path and the cooling liquid outflow path are formed in the cover. In this way, the heat exchange effect between the sealing liquid and the cooling liquid can be obtained even in the cover. Therefore, the radial size of the housing body including the cooling member can be reduced.

  In the mechanical seal of the present invention, the structure of the heat exchange chamber including the position where each pair of inflow passage and outflow passage is formed is simple, so that the cooling member can be simplified and the workability during assembly and maintenance is improved. it can.

It is sectional drawing which shows the mechanical seal of 1st Embodiment of this invention. It is sectional drawing which cut | disconnected FIG. 1 in the predetermined position. It is a perspective view which shows a cooling member. It is sectional drawing which shows the mechanical seal of 2nd Embodiment. It is sectional drawing which shows the mechanical seal of 3rd Embodiment. It is sectional drawing which shows the mechanical seal which the cooling member of 4th Embodiment used. It is a perspective view which shows the cooling member of 4th Embodiment. It is sectional drawing which shows the modification of the cooling member of 4th Embodiment. It is sectional drawing which shows the other modification of the cooling member of 4th Embodiment. It is sectional drawing which shows the mechanical seal of 5th Embodiment. It is sectional drawing which cut | disconnected FIG. 10 in the predetermined position. It is sectional drawing which cut | disconnected FIG. 10 in the other position. It is sectional drawing which shows the modification of a mechanical seal.

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

(First embodiment)
FIG. 1 shows a mechanical seal 10 according to a first embodiment of the present invention. The mechanical seal 10 includes a housing 11 that is fixed to a casing 1 of a fluid machine (for example, a boiler feed water pump that handles high-temperature fluid). A rotating shaft 2 disposed in the casing 1 is passed through the housing 11, and a driven ring 17 that is a rotating ring and a seat ring 20 that is a stationary ring are disposed around the rotating shaft 2. The mechanical seal 10 of the present embodiment is configured to remove (forcibly cool) frictional heat between the driven ring 17 and the seat ring 20 by circulating the sealing liquid in the housing 11 and cooling with the cooling liquid.

  The housing 11 includes a housing main body 12 that is fixed to the casing 1 with bolts, and a cover 13 that closes the atmosphere side (opposite side of the casing 1) end of the housing main body 12. The housing body 12 is disposed so as to be in contact with the casing 1, and the space between them is sealed with a seal packing. The cover 13 is fixed to the housing main body 12 with bolts (not shown), and the space between them is sealed with seal packing.

  A sleeve 14 is fitted to the rotary shaft 2 so as to be located in the housing 11. The sleeve 14 is fixed to the rotary shaft 2 by a fixing member 15 so as to rotate integrally with the rotary shaft 2. The sleeve 14 and the rotary shaft 2 are sealed with seal packing. The holder 16 is fixed to the sleeve 14 so as to rotate integrally with the casing 1 side. A part of the driven ring 17 is accommodated in the holder 16. The follower ring 17 is not rotatable with respect to the holder 16 but is movable in a direction (axial direction) along the axis of the rotary shaft 2. A seal packing is disposed on the inner peripheral portion of the driven ring 17. A compression ring 18 is disposed between the holder 16 and the driven ring 17. A spring 19 is provided between the compression ring 18 and the holder 16 for elastically urging the driven ring 17 outward along the axis of the rotary shaft 2.

  A seat ring 20 is disposed on the outer side where the driven ring 17 is biased. The seat ring 20 is disposed so as to be sandwiched between the housing body 12 and the cover 13. The seat ring 20 is held in the housing 11 so as not to rotate by inserting a pin 21 fixed to the cover 13. The seat ring 20 is sealed between the housing main body 12 and the cover 13 by seal packing. The driven ring 17 and the seat ring 20 are formed so that the facing positions along the axial direction of the rotating shaft 2 are perpendicular to the axis of the rotating shaft 2. Then, when the driven ring 17 is elastically pressed against the seat ring 20 by the urging force of the spring 19, the contact portion seals the sealing liquid chamber 23, which will be described later, from the atmosphere side. 22 is configured.

  In this embodiment, the material of the driven ring 17 is carbon, and the material of the seat ring 20 is silicon carbide. However, the material of the driven ring 17 and the seat ring 20 is not limited to this. Generally, carbon is used on one side, and ceramics, cemented carbide, stainless steel, or the like can be used on the other side.

  A sealing liquid chamber 23 filled with sealing water (sealing liquid) made of fluid (pumped water) handled by the fluid machine is formed in the housing 11 so as to be positioned on the outer peripheral portion of the driven ring 17. . The atmosphere side of the sealing liquid chamber 23 is sealed with a sliding surface 22. A pumping ring 24 that constitutes a circulating means for circulating the sealing liquid is disposed on the casing 1 side of the sealing liquid chamber 23. The pumping ring 24 is fixed to the sleeve 14 so as to be positioned at the end of the holder 16, and can be rotated integrally by the rotation of the rotating shaft 2. The pumping ring 24 is provided with a labyrinth 25 a for blocking the inflow of pumped water in the casing 1 on the outer peripheral portion located at a predetermined distance from the inner peripheral surface of the insertion portion 12 a of the housing body 12. Further, a groove extending in the axial direction with a predetermined interval in the circumferential direction is provided on the outer peripheral portion of the pump ring 24 on the sealing liquid chamber 23 side. A blade portion 25b is formed by a portion where the groove is not formed. The blade portion 25 b causes the sealing liquid in the sealing liquid chamber 23 to flow outward in the radial direction, and passes from the sealing liquid inflow path 29 through the cooling member 35 and the sealing liquid outflow path 30 to enter the sealing liquid chamber 23. Circulate to

  In the housing 11, a heat exchange chamber 26 having a cylindrical cross section viewed from the axial direction of the rotary shaft 2 is formed so as to be positioned on the outer peripheral portion of the sealing liquid chamber 23. In the present embodiment, the housing body 12 includes a first body 12A that is fixed to the casing 1 and a second body 12B that is provided with a cover 13. These first and second main bodies 12A and 12B are fixed at the inner peripheral screw portion of the cover member 28, so that the sealing liquid chamber 23 positioned on the outer periphery of the driven ring 17 and the outer periphery of the sealing liquid chamber 23 are positioned. Heat exchange chamber 26 is formed. The sealing liquid chamber 23 and the heat exchange chamber 26 are partitioned by a cylindrical partition member 27. The partition member 27 and the first and second main bodies 12A and 12B are sealed with seal packing. Further, the outer peripheral portion of the heat exchange chamber 26 is sealed by a cylindrical cover member 28. The cover member 28 and the first and second main bodies 12A and 12B are sealed with seal packing.

  The sealing liquid chamber 23 and the heat exchange chamber 26 are communicated with each other by a sealing liquid inflow path 29 and a sealing liquid outflow path 30 that form a sealing liquid flow path. One end of the sealing liquid inflow passage 29 is opened so as to be located on the outer peripheral portion of the pumping ring 24 which is a position away from the sliding surface 22. The other end of the sealing liquid inflow passage 29 is opened so as to be positioned on one (right) end side in the axial direction of the heat exchange chamber 26. Specifically, the other end of the sealing liquid inflow passage 29 is an annular opening 29 a having the same axis as the axis of the heat exchange chamber 26, and this annular opening 29 a is in the axial direction of the heat exchange chamber 26. Opened (communication) at the end. One end of the sealing liquid outflow path 30 is opened so as to be located at the end of the seat ring 20 that is in the vicinity of the sliding surface 22. The other end of the sealing liquid outflow path 30 is opened so as to be positioned on the other (left) end side of the heat exchange chamber 26. Specifically, the other end of the sealing liquid outflow passage 30 is an annular opening 30 a similar to the sealing liquid inflow passage 29, and this annular opening 30 a is the end of the heat exchange chamber 26 in the axial direction. It is opened at.

  In the housing 11, an annular coolant chamber 31 is provided so as to be positioned on the outer periphery of the seat ring 20. The coolant chamber 31 is formed by providing a recess in the housing body 12. Cooling water (cooling liquid) is supplied to the cooling liquid chamber 31 from a cooling liquid supply unit (not shown) disposed outside the housing 11. The coolant is also circulated and supplied into the heat exchange chamber 26.

  The housing 11 is provided with a cooling liquid inflow path 32 and a cooling liquid outflow path 34 that constitute a cooling liquid flow path in order to circulate and supply the cooling liquid to the cooling liquid chamber 31 and the heat exchange chamber 26. The coolant inflow passage 32 is formed so that one end is located on the outer peripheral portion of the housing 11 and the other end extends in the radial direction and communicates with the coolant chamber 31. The cooling liquid inflow path 32 includes a flow dividing portion 33, and the flow dividing portion 33 is opened so as to be positioned on the inner peripheral portion of the heat exchange chamber 26. Specifically, the end of the flow dividing portion 33 is an annular opening 33 a that is inscribed in the cylindrical heat exchange chamber 26, and the annular opening 33 a is an inner peripheral portion in the radial direction of the heat exchange chamber 26. Open (communication). The coolant outflow passage 34 is formed so that one end is located in the outer peripheral portion of the housing 11 near the end portion on the casing 1 side, and the other end is opened so as to be located in the outer peripheral portion of the heat exchange chamber 26. Specifically, the other end of the coolant outflow passage 34 is an annular opening 34 a that circumscribes the cylindrical heat exchange chamber 26, and the annular opening 34 a is an outer peripheral portion in the radial direction of the heat exchange chamber 26. It is opened at. That is, with respect to the heat exchange chamber 26, the coolant inflow path 32 is opened at one end side in the radial (radial) direction, and the coolant outflow path 34 is opened at the other end side in the radial direction.

  In this heat exchange chamber 26, the sealing liquid inflow passage 29 and the sealing liquid outflow path 30 are opened at both ends in the axial direction, so that the sealing liquid circulated and supplied flows in the axial direction. Further, since the cooling liquid inflow path 32 and the cooling liquid outflow path 34 are open at both ends in the radial direction, the circulatingly supplied cooling liquid flows in the radial direction. A cooling member 35 is disposed in the heat exchange chamber 26 in order to partition and flow the sealing liquid and the cooling liquid without mixing them.

  The cooling member 35 is a cylindrical member formed of a material having excellent thermal conductivity such as a copper alloy. A seal packing 36 that seals the housing body 12 is disposed on the outer peripheral portion and the inner peripheral portion of the cooling member 35. With these seal packings 36, the cooling member 35 is liquid-tightly arranged in the heat exchange chamber 26. As shown in FIGS. 2 and 3, the cooling member 35 is provided with a large number of first flow paths 37 extending in the axial direction and a large number of second flow paths 38 extending in the radial direction and penetrating therethrough. ing. The first flow path 37 of the present embodiment is a set of four provided so as to be adjacent in the radial direction, and a plurality of sets of the first flow paths 37 are provided at predetermined intervals in the circumferential direction. In addition, the second flow paths 38 are provided as a set of three adjacent to each other in the axial direction, and a plurality of sets of the second flow paths 38 are provided at predetermined intervals in the circumferential direction. As shown in FIG. 1, the set of first flow paths 37 adjacent in the radial direction are all located in the annular openings 29a and 30a for the sealing liquid, and the second flow paths 38 adjacent in the axial direction are arranged. The sets are all located in the annular openings 33a, 34a for the coolant.

  In the mechanical seal 10 configured as described above, the sealing liquid inflow path 29, the sealing liquid outflow path 30, and the first flow path 37 including the sealing liquid chamber 23 constitute a sealing liquid flow path. When the rotating shaft 2 of the fluid machine is rotated, the pumping ring 24 rotates, so that the sealing liquid in the sealing liquid chamber 23 flows into the heat exchange chamber 26 from the sealing liquid inflow path 29 by the blade portion 25b. To do. Then, it flows in the axial direction through each first flow path 37 of the cooling member 35 disposed in the heat exchange chamber 26. Thereafter, the liquid flows into the sealing liquid chamber 23 through the sealing liquid outflow passage 30 and then flows to the casing 1 side. Then, it is circulated again to the sealing liquid inflow passage 29 at the outer peripheral portion of the pumping ring 24.

  At this time, leakage of the sealing liquid to the atmosphere side is prevented by the sliding surface 22 where the driven ring 17 and the seat ring 20 are in sliding contact. Further, the frictional heat of the driven ring 17 and the seat ring 20 generated by the sliding contact is removed by the sealing liquid. However, in the case where the fluid machine is a boiler feed water pump that handles a high temperature fluid, the pumping water as the sealing liquid is at a high temperature, and therefore the frictional heat cannot be sufficiently removed. However, in the present embodiment, the sealing liquid can be forcibly cooled and the frictional heat can be removed by the cooling liquid circulated from the cooling liquid supply unit, and the high-temperature fluid can also be cooled.

  Specifically, the cooling liquid inflow path 32, the cooling liquid outflow path 34, and the second flow path 38 constitute a cooling liquid flow path. When the coolant is supplied from the coolant supply unit to the mechanical seal 10, the coolant is supplied to the coolant chamber 31 through the coolant inflow passage 32. Thereby, the frictional heat generated in the seat ring 20 is forcibly cooled. Further, the coolant flows into the radially inner peripheral portion of the heat exchange chamber 26 through the diverter 33. Then, it flows in the radial direction through each second flow path 38 of the cooling member 35 disposed in the heat exchange chamber 26. Thereafter, the coolant is returned to the coolant supply section through the coolant outflow passage 34.

  That is, the high-temperature sealing liquid flows in the cooling member 35 along the axial direction, and the low-temperature cooling liquid flows so as to intersect along the radial direction. Since the cooling member 35 is formed of a material having excellent thermal conductivity, the sealing liquid is cooled and the temperature of the cooling liquid is raised by heat exchange (equilibrium) action. Further, since the cooled sealing liquid is supplied to the vicinity of the sliding surface 22 of the sealing liquid chamber 23 where the frictional heat is generated most, it can be efficiently cooled.

  In addition, the heat exchange chamber 26 of the present embodiment has a simple configuration in which the inflow passages 29 and 32 and the outflow passages 30 and 34 are opened at both ends in the axial direction and both ends in the radial direction, respectively. The cooling member 35 disposed in the heat exchange chamber 26 has a cylindrical shape, and has a simple configuration in which flow paths 37 and 38 including linear holes penetrating in the axial direction and the radial direction are provided. is there. Therefore, the housing 11 and the cooling member 35 can be easily manufactured, and workability during assembly and maintenance can be improved. Furthermore, the cooling member 35 can easily clean the first and second flow paths 37 and 38 during maintenance.

(Second Embodiment)
FIG. 4 shows the mechanical seal 10 of the second embodiment. The second embodiment is different from the first embodiment in that the coolant chamber 31 is not formed on the outer peripheral portion of the seat ring 20. Specifically, the seat ring 20 is disposed outside the driven ring 17 in the housing 11 of the second embodiment, as in the first embodiment. The seat ring 20 is held in the housing 11 so as not to rotate by inserting a pin 21 fixed to the cover 13. The seat ring 20 and the cover 13 are sealed with seal packing. Further, the space between the seat ring 20 and the housing body 12 constitutes a part of the sealing liquid chamber 23 without being sealed.

  In the mechanical seal 10 of the second embodiment, when the rotary shaft 2 is rotated, the sealing liquid is circulated and supplied in the housing 11 as in the first embodiment. When the cooling liquid is supplied from the cooling liquid supply unit, the seat ring 20 cannot be directly cooled with the cooling liquid, but can be cooled with the sealing liquid cooled with the cooling liquid.

(Third embodiment)
FIG. 5 shows a mechanical seal 10 of the third embodiment. The third embodiment is different from the first embodiment in that the sealing liquid is caused to flow in the radial direction and the cooling liquid is caused to flow in the axial direction with respect to the cooling member 35.

  Specifically, the sealing liquid inflow passage 29 is provided so as to extend from the sealing liquid chamber 23 toward the radially outer side and open at the outer peripheral portion in the radial direction of the heat exchange chamber 26. The sealing liquid outflow path 30 is provided so as to extend from the sealing liquid chamber 23 and open at the radially inner periphery of the heat exchange chamber 26. The coolant inflow passage 32 is provided so as to open from the outer peripheral portion of the housing 11 on the one (left) end side in the axial direction of the heat exchange chamber 26. The coolant outflow passage 34 is provided so as to open from the outer peripheral portion of the housing 11 on the other (right) end side in the axial direction of the heat exchange chamber 26.

  The mechanical seal 10 of the third embodiment can obtain the same operations and effects as those of the first embodiment. Moreover, in this 3rd Embodiment, it is good also as a structure which does not provide the coolant chamber 31 similarly to 2nd Embodiment.

(Fourth embodiment)
6 and 7 show a mechanical seal 10 of the fourth embodiment. The fourth embodiment is greatly different from the first embodiment in that the cooling member 35 has a cylindrical shape constituted by a plurality of fan-shaped divided units 39.

  Specifically, four divided units 39 are disposed in the heat exchange chamber 26 of the housing 11. Each divided unit 39 is formed of a fan-shaped hollow pipe, and is provided with a first connecting portion 40 at one end in the circumferential direction on one surface side along the axial direction, and a second connecting portion 41 at the other end on the other surface side. Is provided. Connection holes (not shown) for connecting the first and second connection portions 41 are provided at both ends of the heat exchange chamber 26 facing in the axial direction instead of the annular opening.

  In the mechanical seal 10 using the division unit 39, the sealing liquid in the sealing liquid chamber 23 flows into the division unit 39 through the sealing liquid inflow path 29 by the rotation of the pumping ring 24. Thereafter, it is circulated to the sealing liquid chamber 23 through the sealing liquid outflow path 30.

  Further, the coolant flows into the inner peripheral portion in the radial direction with respect to the heat exchange chamber 26 through the coolant inflow passage 32. Then, it flows between the divided units 39 and flows to the outer peripheral portion in the radial direction of the heat exchange chamber 26, and returns to the outside of the housing 11 through the cooling liquid outflow path 34.

  As described above, in the fourth embodiment, the cooling member 35 including the dividing unit 39 partitions the sealing liquid and the cooling liquid to flow in the axial direction and the radial direction, and forcibly cools the high-temperature sealing liquid with the cooling liquid. Thus, it can be circulated and supplied to the sealing liquid chamber. Therefore, the same operation and effect as the first embodiment can be obtained. Further, the fourth embodiment can be similarly applied to the mechanical seal 10 of the second embodiment in which the coolant chamber 31 is not provided, and the third embodiment in which the flow direction of the sealing liquid and the coolant is reversed. The present invention can be similarly applied to the mechanical seal 10 in the form.

  In addition, the division | segmentation unit 39 of the cooling member 35 of 4th Embodiment is not restricted to a sector shape, A various change is possible. Specifically, as shown in FIG. 8, an oval shape may be used, and the first connection portion 40 may be provided at one end on one surface side, and the second connection portion 41 may be provided at the other end on the other surface side. Moreover, as shown in FIG. 9, you may comprise by a cylindrical straight pipe. Even if it does in this way, the effect | action and effect similar to 4th Embodiment can be acquired.

(Fifth embodiment)
FIG. 10 shows a mechanical seal 10 of the fifth embodiment. The mechanical seal 10 has a small size in the radial direction of the housing 11 without reducing the heat exchange function of the sealing liquid and the cooling liquid by forming a part of each liquid flow path in the cover 13 of the housing 11. It differs from each embodiment by the point which was made to achieve.

  Similar to the first embodiment, the housing 11 of the fifth embodiment includes a housing main body 12 that is fixed to the casing 1 with bolts, and a cover 13 that closes the opposite end of the housing main body 12 from the casing 1. Among these, the housing body 12 is different from the first embodiment in that it is not divided into the first and second bodies 12A and 12B. The cover 13 is different from the first embodiment in that a sealing liquid outflow path 30 and a cooling liquid outflow path 34 which are part of each liquid flow path are formed.

  Specifically, as shown in FIGS. 10 and 11, the housing main body 12 includes a radially inner inner ring portion 45 located on the rotating shaft 2 side and a radially outer outer ring portion exposed to the atmosphere. 47, and a rib 49 that integrally connects the inner ring portion 45 and the outer ring portion 47 to each other.

  The inner ring portion 45 has a cylindrical shape that partitions the sealing liquid chamber 23 located on the radially inner side and the heat exchange chamber 26 formed between the outer ring portion 47 on the radially outer side. On the casing 1 side of the inner ring portion 45, a reduced diameter insertion portion 46 through which the rotary shaft 2 is rotatably inserted is provided. The outer ring portion 47 has a cylindrical shape that partitions the heat exchange chamber 26 located on the radially inner side and the atmosphere located on the radially outer side. The outer ring portion 47 is formed to have a large radial thickness in order to form a bolt hole for fixing the housing body 12 to the casing 1. Further, the outer ring portion 47 is provided with an expanded portion 48 on the outer side in the axial direction of the inner peripheral portion. A plurality of ribs 49 are provided at predetermined intervals in the circumferential direction, and connect the outer peripheral portion of the insertion portion 46 protruding inward in the axial direction from the outer ring portion 47 and the inner end portion of the outer ring portion 47. The rib 49 is provided with a flow hole 50 for flowing the coolant.

  The casing 1 of the present embodiment is provided with an arrangement portion 1a for accommodating and arranging the rib 49 of the housing main body 12. This arrangement | positioning part 1a is provided with the shaft insertion part 1b which penetrates the rotating shaft 2 rotatably. The tip of the insertion portion 46 is disposed in a liquid-tight manner on the inner surface side of the shaft insertion portion 1b. The interior defined by the arrangement portion 1 a, the insertion portion 46, and the outer ring portion 47 is adjacent to the axial end of the heat exchange chamber 26, and an annular opening 33 a for cooling water that communicates with the heat exchange chamber 26. Configure.

  As shown in FIGS. 10 and 12, the cover 13 is formed of a material having excellent thermal conductivity, and closes the outer end of the housing body 12 in the axial direction. The outer diameter of the cover 13 is set to be the same as the outer diameter of the housing body 12.

  The sealing liquid outflow passage 30 includes an upstream (inlet) side annular opening 30a located on the radially outer side, a downstream (outlet) side annular opening 30b located on the radially inner side, and these openings 30a. , 30b and a pair of communicating portions 30c. The opening 30 a communicates with an expanded portion 48 located on the radially outer side of the cooling member 35 in the heat exchange chamber 26. The opening 30 b communicates with the sealing liquid chamber 23 located on the radially inner side of the inner ring portion 45. A pair of communication portions 30c are provided so as to extend in the radial direction from the outer peripheral portion of the cover 13 to the opening 30b. The communication part 30c located on the lower side is water-stopped by the plug cap 51 outside the opening part 30a. The communication part 30c located on the upper side is connected to an air vent pipe 52 provided with a valve.

  The coolant outflow path 34 includes a pair of openings 34a and 34a having a semi-annular shape located between the openings 30a and 30b of the sealing liquid outflow path 30, and a connection portion 34b for returning to the coolant supply section. Prepare. Each opening 34 a, 34 a is formed in a C shape whose both ends are located in the vicinity of each communication portion 30 c, 30 c of the sealing liquid outflow passage 30. The connection portion 34b is formed so that one end is located on the outer peripheral portion of the cover 13, and the other end is opened so as to communicate with the one opening portion 34a. One opening 34 a in which the connection portion 34 b is formed communicates with the other opening 34 a in which the connection portion 34 b is not formed by an annular gap 53 formed between the cooling member 35 and the cover 13. Is done.

  A sleeve 14 is fitted to the rotary shaft 2 so as to rotate integrally so as to be positioned in the housing 11. The sleeve 14 is provided with a flange portion 14a so as to be positioned on the casing 1 side. A pumping ring 24 having a labyrinth 25a for blocking the inflow of pumped water in the casing 1 is fixed to the outer peripheral portion of the flange portion 14a. The outer peripheral portion of the pumping ring 24 is in close contact with the inner ring portion 45 of the housing body 12. Further, the pump ring 24 is provided with grooves at a predetermined interval in the circumferential direction, and a blade portion 25b is constituted by a portion where the grooves are not formed. A driven ring 17 that is rotated integrally with the rotary shaft 2 via the sleeve 14 is fixed inside the flange portion 14 a and the pumping ring 24.

  A seat ring 20 is disposed to face the driven ring 17. The seat ring 20 of the present embodiment includes a first ring 20A that is fixed in a holder 16 that is fixed to the cover 13, and a second ring 20B that is connected to the first ring 20A. A spring 19 is disposed between the cover 13 and the seat ring 20. Due to the urging of the spring 19 along the axis of the rotary shaft 2, the seat ring 20 is elastically pressed against the driven ring 17, and the abutting portion of the sliding surface 22 seals the sealing liquid chamber 23. Configure. The sliding surface 22 of this embodiment is located on the radially inner side of the blade portion 25 b of the pump ring 24.

  A sealing liquid chamber 23 is formed in the housing 11 so as to be positioned on the outer peripheral portion of the driven ring 17. Further, a cylindrical heat exchange chamber 26 partitioned by the inner ring portion 45 is formed so as to be positioned on the outer peripheral portion of the sealing liquid chamber 23. The sealing liquid chamber 23 and the heat exchange chamber 26 are communicated with each other by a sealing liquid inflow path 29 formed in the inner ring portion 45 of the housing body 12 and the above-described sealing liquid outflow path 30 formed in the cover 13. . The sealing liquid inflow passage 29 is formed of through holes formed at predetermined intervals in the circumferential direction of the inner ring portion 45 so as to be located on the radially outer side of the blade portion 25 b of the pump ring 24. The pair of sealing liquid inflow passages 29 that are opposed to each other in the radial direction is provided with a well weir portion 29 b (see FIG. 11) that protrudes toward the outer peripheral portion of the pump ring 24.

  The housing 11 circulates and supplies the coolant to the heat exchange chamber 26, and the coolant inlet passage 32 provided in the housing body 12 and the above-described annular opening 33a formed between the housing body 12 and the casing 1 A cooling fluid passage formed of the above-described cooling fluid outflow passage 34 formed in the cover 13 is provided. The coolant inflow path 32 extends in an inclined manner so that one end is located at the center of the outer surface of the outer ring portion 47 of the housing body 12 and the other end is located in the vicinity of the rib 49.

  In the heat exchange chamber 26 of the fifth embodiment, a sealing liquid inflow path 29 that is an inlet of the sealing liquid is provided radially inward at the center in the axial direction, and a sealing liquid outflow path 30 that is an outlet of the sealing liquid. The opening 30a is provided outside in the axial direction and radially outside. An annular opening 33a that is an inlet for the coolant is provided on the inner side in the axial direction, and an opening 34a of the coolant outlet channel 34 that is an outlet for the coolant is provided on the outer side in the axial direction. In the heat exchange chamber 26, as in each embodiment, there is a cooling member 35 that partitions the sealing liquid and the cooling liquid without mixing them, and causes one to flow in the radial direction and the other to flow in the axial direction. It is arranged.

  As shown in FIGS. 10 and 11, the cooling member 35 is a cylindrical member formed of a material having excellent thermal conductivity. A seal packing 36 that seals the housing body 12 is disposed on the outer peripheral portion and the inner peripheral portion of the cooling member 35. The cooling member 35 is provided with a plurality of first flow paths 37 extending in the axial direction and penetrating at a predetermined angle in the circumferential direction. All the first flow paths 37 are assembled so as to be positioned in the openings 34 a of the cover 13. The cooling member 35 is provided with a plurality of second flow passages 38 extending in the radial direction and penetrating at a predetermined angle in the circumferential direction so as to be positioned between the adjacent first flow passages 37, 37. . All the second flow paths 38 are assembled so as to be positioned in the expanded portion 48 of the outer ring portion 47.

  In the mechanical seal 10 configured as described above, the sealing liquid inflow path 29, the sealing liquid outflow path 30, and the second flow path 38 including the sealing liquid chamber 23 constitute a sealing liquid flow path. When the rotary shaft 2 of the fluid machine is rotated, the pump ring 24 rotates in the housing 11 via the sleeve 14. Then, the sealing liquid in the sealing liquid chamber 23 is stirred by the blade portion 25b in the circumferential direction and radially outward. The sealing liquid at the outer peripheral portion of the pumping ring 24 flows into the heat exchange chamber 26 through the sealing liquid inflow passage 29 of the inner ring portion 45 by a blocking action by the well weir portion 29b. Then, it flows radially outward through the second flow paths 38 of the cooling member 35 disposed in the heat exchange chamber 26. Then, after flowing into the expansion part 48 of the heat exchange chamber 26, it is circulated from the outer opening 30 a of the sealing liquid outflow passage 30 through the communication part 30 c to the sealing liquid chamber 23 from the inner opening 30 b. .

  In the mechanical seal 10, the coolant inflow path 32, the annular opening 33 a, the coolant outflow path 34, and the first flow path 37 constitute a coolant flow path. When the coolant is supplied from the coolant supply unit to the mechanical seal 10, it flows into the annular opening 33 a through the coolant inflow path 32. After that, after flowing in the axial direction through each first flow path 37 of the cooling member 35 disposed in the heat exchange chamber 26, it is returned to the cooling liquid supply section through the cooling liquid outflow path 34.

  In the cooling member 35, the high-temperature sealing liquid flows in the radial direction through the second passage 38, and the low-temperature cooling liquid flows in the axial direction through the first passage 37. In the cover 13, the low-temperature coolant flows in the circumferential direction toward the connection portion 34 b through the opening 34 a, and the high-temperature sealing liquid is located on the inner side from the opening 30 a located outside the opening 34 a. It flows toward the opening 30b. Since the cover 13 and the cooling member 35 are formed of a material having excellent thermal conductivity, the sealing liquid is cooled and the temperature of the cooling liquid is raised by heat exchange (equilibrium) action.

  The mechanical seal 10 of 5th Embodiment can acquire the effect | action and effect similar to each embodiment. Moreover, in the fifth embodiment, the heat exchange action between the sealing liquid and the cooling liquid can be obtained not only in the heat exchange chamber 26 partitioned by the cooling member 35 but also in the cover 13. Therefore, even if the heat exchange chamber 26 including the cooling member 35 is made small, the heat exchange efficiency can be supplemented in the cover 13. Therefore, the size of the housing body 12 including the cooling member 35 in the radial direction can be reduced.

  The mechanical seal 10 of the present invention is not limited to the configuration of the above embodiment, and various modifications can be made.

  For example, in the first to fourth embodiments, the inflow passages 29 and 32 and the outflow passages 30 and 34 are opened to the inner peripheral portion and the outer peripheral portion, which are both ends of the radius of the heat exchange chamber 26, but both ends of the diameter You may make it open in the opposing position of the outer peripheral part which is. Further, as in the fifth embodiment, one may be opened at the inner side or the outer side in the radial direction, and the other may be opened at one end in the axial direction.

  In the first to third and fifth embodiments, the cylindrical cooling member 35 is provided with the first flow path 37 penetrating in the axial direction and the second flow path 38 penetrating in the radial direction. 13, a first flow path 55 that flows in from the radial direction and flows out in the axial direction and a second flow path 56 that flows in from the axial direction and flows out in the radial direction are provided, and a sealing liquid is provided on one side. It is good also as a structure which is made to flow and makes a cooling fluid flow to the other. In this modified example, a packing (O-ring) 57 is provided in the cooling liquid outflow path 34 of the cooling member 35 in order to prevent the sealing liquid and the cooling liquid from mixing. Even if it does in this way, the effect | action and effect similar to each embodiment can be acquired.

  Moreover, the cooling member 35 of 1st Embodiment is provided in the main body which makes | forms a cylindrical shape, the 1st flow path 37 is adjacent to radial direction as one set, and the 2nd flow path 38 is adjacent to an axial direction, and is 3 Although provided as one set, as in the fifth embodiment, only one continuous oval shape may be provided and provided at predetermined intervals in the circumferential direction.

  In the fifth embodiment, the sealing liquid outflow path 30 and the cooling liquid outflow path 34 which are part of the liquid flow path are provided in the cover 13, but the sealing liquid inflow path 29 and the cooling liquid inflow path 32 are provided. May be provided. Further, the sealing liquid inflow path 29 and the cooling liquid outflow path 34 may be provided, and the sealing liquid outflow path 30 and the cooling liquid inflow path 32 may be provided.

  Further, the fifth embodiment in which a part of the liquid flow path is formed in the cover 13 may be configured to directly cool the seat ring 20 with the coolant as in the first embodiment. In the fifth embodiment, the sealing liquid may flow in the axial direction and the cooling liquid may flow in the radial direction.

  Further, the specific shapes of the driven ring 17 and the seat ring 20 are not limited to the configuration of the embodiment as long as the basic functions such as the configuration of the sliding surface 22 can be realized. The circulating means is not limited to the pumping ring 24 and is not limited to the configuration of the embodiment as long as the sealing liquid can be circulated.

DESCRIPTION OF SYMBOLS 1 ... Casing 2 ... Rotating shaft 10 ... Mechanical seal 11 ... Housing 12 ... Housing main body
13 ... cover 14 ... sleeve 17 ... driven ring (rotating ring)
20 ... Seat ring (fixed ring)
22 ... Sliding surface 23 ... Sealing liquid chamber 24 ... Pumping ring (circulation means)
DESCRIPTION OF SYMBOLS 26 ... Heat exchange chamber 29 ... Sealing liquid inflow path 30 ... Sealing liquid outflow path 31 ... Cooling liquid chamber 32 ... Cooling liquid inflow path 33 ... Diverging part 34 ... Cooling liquid outflow path 35 ... Cooling member 37 ... 1st flow path 38 ... second flow path 39 ... divided unit

Claims (9)

A housing fixed to the casing of the fluid machine and passing through the rotating shaft of the fluid machine;
A rotating ring disposed rotatably in the housing and rotating integrally with the rotating shaft;
A stationary ring disposed in the housing in a non-rotatable manner, wherein the rotating ring contacts and forms a sliding surface;
A sealing liquid chamber formed on the outer periphery of the rotating ring;
An annular heat exchange chamber formed on the outer periphery of the sealing liquid chamber;
A sealing liquid inflow path and a sealing liquid outflow path for communicating the sealing liquid chamber and the heat exchange chamber;
A coolant inflow passage and a coolant outflow passage, which are communicated with the heat exchange chamber and circulate and supply the coolant outside the housing;
A substantially cylindrical cooling member that is disposed in the heat exchange chamber and separates and flows the sealing liquid from the sealing liquid inflow path and the cooling liquid from the cooling liquid inflow path;
A circulating means for circulating a sealing liquid from the sealing liquid inflow path to the sealing liquid chamber through the cooling member and the sealing liquid outflow path;
Bei to give a,
In the heat exchange chamber, the cooling member is configured to cause one of a sealing liquid and a cooling liquid to flow in the radial direction and the other to flow in the axial direction . A housing fixed to the casing of the fluid machine and passing through the rotating shaft of the fluid machine;
A rotating ring disposed rotatably in the housing and rotating integrally with the rotating shaft;
A stationary ring disposed in the housing in a non-rotatable manner, wherein the rotating ring contacts and forms a sliding surface;
A sealing liquid chamber formed on the outer periphery of the rotating ring;
An annular heat exchange chamber formed on the outer periphery of the sealing liquid chamber;
A sealing liquid inflow path and a sealing liquid outflow path for communicating the sealing liquid chamber and the heat exchange chamber;
A coolant inflow passage and a coolant outflow passage, which are communicated with the heat exchange chamber and circulate and supply the coolant outside the housing;
A substantially cylindrical cooling member that is disposed in the heat exchange chamber and separates and flows the sealing liquid from the sealing liquid inflow path and the cooling liquid from the cooling liquid inflow path;
A circulating means for circulating a sealing liquid from the sealing liquid inflow path to the sealing liquid chamber through the cooling member and the sealing liquid outflow path;
Bei to give a,
The cooling member has a cylindrical shape that is liquid-tightly disposed in the heat exchange chamber, and includes either a first flow path through which one of the sealing liquid and the cooling liquid flows, and any of the sealing liquid and the cooling liquid. A mechanical seal having a second flow path through which the other flows . A housing fixed to the casing of the fluid machine and passing through the rotating shaft of the fluid machine;
A rotating ring disposed rotatably in the housing and rotating integrally with the rotating shaft;
A stationary ring disposed in the housing in a non-rotatable manner, wherein the rotating ring contacts and forms a sliding surface;
A sealing liquid chamber formed on the outer periphery of the rotating ring;
An annular heat exchange chamber formed on the outer periphery of the sealing liquid chamber;
A sealing liquid inflow path and a sealing liquid outflow path for communicating the sealing liquid chamber and the heat exchange chamber;
A coolant inflow passage and a coolant outflow passage, which are communicated with the heat exchange chamber and circulate and supply the coolant outside the housing;
A substantially cylindrical cooling member that is disposed in the heat exchange chamber and separates and flows the sealing liquid from the sealing liquid inflow path and the cooling liquid from the cooling liquid inflow path;
A circulating means for circulating a sealing liquid from the sealing liquid inflow path to the sealing liquid chamber through the cooling member and the sealing liquid outflow path;
Bei to give a,
The cooling member has a substantially cylindrical shape constituted by a plurality of divided units,
Each of the divided units has a first flow path through which either the sealing liquid or the cooling liquid flows.
A mechanical seal characterized in that a second flow path through which either the sealing liquid or the cooling liquid flows is formed between the adjacent divided units in the heat exchange chamber . Each of the divided units has a fan shape,
Wherein said first flow path, and the sealing liquid inlet passage or the coolant inlet passage opening at one end side in the axial direction before Symbol heat exchange chamber, open at the other axial end side of the heat exchange chamber mechanical seal according to claim 3, characterized in that connects the sealing fluid outflow passage or the coolant outlet passage. The cooling member, in the heat exchange chamber, to any one of claims 2 to 4, characterized in that flowing the other in the axial direction together with flowing the one of the sealing liquid and the cooling liquid in the radial direction The mechanical seal described. While opening the sealing liquid inflow path and the sealing liquid outflow path at one end side and the other end side in either the axial direction or the radial direction of the heat exchange chamber,
6. The cooling liquid inflow path and the cooling liquid outflow path are opened at one end side and the other end side of either the axial direction or the radial direction of the heat exchange chamber , respectively. The mechanical seal of any one of Claims . The sealing liquid inflow path is opened at a position away from the sliding surface of the sealing liquid chamber, and the sealing liquid outflow path is opened at a position close to the sliding surface of the sealing liquid chamber. The mechanical seal according to any one of claims 1 to 6, wherein the mechanical seal is provided. The mechanical seal according to any one of claims 1 to 7 , further comprising a cooling liquid chamber communicating with the cooling liquid inflow path in an outer peripheral portion of the stationary ring. The housing includes a housing main body fixed to the casing, and a cover that closes an end opposite to the casing of the housing main body,
The cover includes a part of a sealing liquid flow path including the sealing liquid inflow path and the sealing liquid outflow path, and a part of the cooling liquid flow path including the cooling liquid inflow path and the cooling liquid outflow path. mechanical seal according to any one of claims 1 8, characterized in that formed on.

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