JP5921995B2 - mechanical seal - Google Patents

Description

  The present invention relates to a mechanical seal used in a fluid machine.

  The mechanical seal includes a housing through which a rotating shaft of a fluid machine such as a pump passes and forms a sealing liquid chamber for cooling around the rotating shaft. A driven ring (rotating ring) that rotates integrally with the rotary shaft is disposed in the housing so as to be positioned in the sealing liquid chamber, and a seat ring (the ring) is pressed along the axial direction. (Fixed ring) is provided. The inside of the sealing liquid chamber is filled with a sealing liquid (pumped water) for removing frictional heat between the driven ring and the seat ring.

  The mechanical seal has a cooling mechanism for cooling the sealing liquid whose temperature is increased by removing the frictional heat and the high-temperature sealing liquid itself. As this cooling mechanism, there is a mechanism for forcibly cooling the sealing liquid by disposing a water-cooled heat exchanger outside the housing and circulating the external cooling water and the sealing liquid in the sealing liquid chamber. .

  However, a mechanical seal with a water-cooled heat exchanger installed outside the housing connects a pair of sealing liquid pipes that connect the sealing liquid chamber and the heat exchanger, a cooling water source, and a heat exchanger. A pair of cooling water pipes and a water supply pump for supplying the cooling water are required. For this reason, these incidental facilities have a great restriction on the design and production of mechanical seals and require maintenance, which increases costs.

  In the mechanical seal of Patent Document 1, an air-cooled heat exchanger is disposed outside the housing, and the sealing liquid is cooled by passing the sealing liquid through the air-cooled heat exchanger. Further, the mechanical seal of Patent Document 2 is configured such that a heat radiation fin is integrally provided on a seal cover constituting the housing and the heat radiation fin is cooled by a fan to cool the sealing liquid in the seal cover.

  Since the mechanical seals of Patent Documents 1 and 2 do not require a cooling water pipe and a water supply pump for supplying cooling water, it is possible to simplify ancillary facilities and suppress an increase in cost. However, since the mechanical seal of Patent Document 1 still requires piping for sealing liquid for circulatingly supplying the sealing liquid, there is a restriction in design and production. On the other hand, since the mechanical seal of Patent Document 2 does not require piping for sealing liquid, the degree of freedom in design and manufacture is improved. However, the seal cover is cooled via the radiation fin and sealed via the seal cover. Since the stop liquid is cooled, the sealing liquid cannot be efficiently cooled.

JP 9-89119 A JP 2009-250432 A

  An object of the present invention is to provide a mechanical seal capable of efficiently cooling the sealing liquid without increasing the number of incidental facilities.

In order to solve the above problems, a mechanical seal of the present invention is fixed to a casing of the fluid machine in a state of passing through the rotating shaft of the fluid machine, and forms a sealing liquid chamber around the rotating shaft . A rotating ring that is rotatably disposed in the sealing liquid chamber of the housing and rotates integrally with the rotating shaft, and is non-rotatably disposed in the sealing liquid chamber of the housing and rotates. A fixed ring in which a ring abuts to form a sliding surface, a fin portion fixed to the housing and protruding in the axial direction of the rotating shaft, and a heat dissipation member having a sealing liquid channel formed in the fin portion And an inflow passage and an outflow passage formed in the housing for communicating the sealing liquid chamber and the sealing liquid passage of the heat radiating member, and the rotary shaft, Stop liquid from the inflow path to the sealing liquid Road and through the outlet channel has a configuration and a circulating means for circulating the said sealing liquid chamber.

  In this mechanical seal, a heat dissipating member having a sealing liquid channel is disposed on the outer peripheral portion of the sealing liquid chamber of the housing, and an inflow path and an outflow path for communicating the sealing liquid path and the sealing liquid chamber are provided in the housing. It is the structure provided in. Therefore, it is not necessary to provide ancillary equipment such as a pipe for sealing liquid to the housing, so that space can be saved and the degree of freedom in design and production can be improved. And a sealing liquid can be efficiently cooled in the sealing liquid flow path of each fin part.

In this mechanical seal, the fin portion is composed of a plurality of annular protrusions having different diameters with one end side in the axial direction being opened and the other end side being closed, and the inner space being the sealing liquid flow path. has a closing member for closing the opening side of each fin portion, it is preferable that the communication passage for communicating said sealing fluid channel is provided adjacent to the closing member in the radial direction.
Alternatively, the fin portion is composed of a plurality of arc-shaped convex portions having different diameters with one end side in the axial direction being opened and the other end side being closed, and having the internal space as the sealing liquid flow path. has a closing member for closing the opening side, it is preferable that the communication passage for communicating said sealing fluid channel is provided adjacent to the closing member in the radial direction.
In these cases, the out of the fin portion, and the inlet passage into the fins of the outer end or inner end in the radial direction are connected, the outlet channel in the fin portion of the inner end or outer end in the radial direction It is preferable that they are connected.
In addition, the fin portion is formed of a spiral convex portion having one end side in the axial direction opened and the other end side closed, and the internal space serving as the sealing liquid channel, and the opening side of the fin portion is closed. and has a closure member which has said inlet channel is connected to the outer end or inner end in the radial direction of the fin portion, the outlet channel is connected to the inner end or outer end in the radial direction of the fin portion It is good also as a structure.
In this way, since the sealing liquid can be sequentially passed through the sealing liquid flow paths of the fin portions, a sufficient distance (time) for cooling the sealing liquid can be ensured. Therefore, the sealing liquid can be reliably and efficiently cooled.

Moreover, it is preferable that a fan for blowing cooling air to the heat radiating member is disposed on the rotating shaft. If it does in this way, a fan will rotate in response to a rotating shaft by operation of a fluid machine, and it can blow cooling air to a fin part. Therefore, the cooling efficiency can be improved.
In this case, it is preferable that a duct member covering the heat radiating member and the fan is disposed on the outer peripheral portion of the housing. In this way, since the fan air passage can be partitioned, the cooling efficiency can be further improved.

Further, the housing includes a base fixed to the casing, and a seal cover fixed to be positioned on the opposite side of the casing with respect to the base and having the sealing liquid chamber formed therein, radiating member, said the outer peripheral portion of the sealing cover in a state of being disposed in a liquid-tight manner, Tei Rukoto fixed to the base is preferred. If it does in this way, a rotation ring and a fixed ring can be removed integrally with a rotating shaft by canceling fixation of a seal cover to a base. Therefore, cleaning at the time of maintenance and parts replacement can be easily performed.

Furthermore, it is preferable that a heat barrier portion is provided between the housing and the casing. In this way, heat conduction from the fluid machine to the housing can be reduced. Therefore, the cooling efficiency of the sealing liquid in each fin part can further be improved.

  In the mechanical seal of the present invention, the heat dissipating member is disposed in the housing, and the housing is provided with an inflow path and an outflow path for communicating the sealing liquid chamber of the housing and the sealing liquid flow path of the heat dissipating member. There is no need to install additional facilities such as piping. Therefore, space can be saved and the degree of freedom in designing and manufacturing the mechanical seal can be improved. Moreover, since the sealing liquid can be efficiently cooled in the sealing liquid flow path of each fin portion, the frictional heat between the rotating ring and the stationary ring can be reliably removed.

It is sectional drawing which shows the mechanical seal of 1st Embodiment of this invention. It is a principal part expanded sectional view of FIG. It is a perspective view which shows the heat radiating member of FIG. It is a disassembled perspective view which shows the reverse side of the heat radiating member of FIG. It is principal part sectional drawing of a thermal radiation member. It is sectional drawing which shows the state which removed the seal cover of the housing. 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 of 4th Embodiment.

  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). The mechanical seal 10 of the present embodiment is provided with an air-cooled heat radiating member 31 on the outer peripheral portion of the housing 11, and the sealing liquid in the sealing liquid chamber 21 is circulated and supplied to the heat radiating member 31. The liquid can be efficiently cooled.

  The housing 11 is disposed through the rotary shaft 2 protruding from the casing 1, and includes a sealing liquid chamber 21 positioned around the rotary shaft 2. A driven ring 25 that is a rotating ring and a seat ring 28 that is a stationary ring are disposed in the sealing liquid chamber 21. Specifically, the housing 11 includes a base 12 fixed to the casing 1 by bolting, and a seal cover 17 fixed to the base 12 by bolting.

  The base 12 has an annular shape having an opening 13 through which the rotary shaft 2 passes. The opening 13 of the base 12 is provided with an annular mounting portion 14 that protrudes toward the casing 1 in a direction (axial direction) along the axis of the rotary shaft 2. The base 12 is fixed to the casing 1 by allowing the bolts 15 to pass through the attachment portions 14 in the axial direction. In addition, between the attachment part 14 and the casing 1 is sealed with seal packing. In a state where the base 12 is attached to the casing 1, a heat barrier portion 16 having a predetermined gap is formed between the outer peripheral portion of the attachment portion 14, that is, between the base 12 and the casing 1.

  The seal cover 17 has a cylindrical shape whose outer diameter is smaller than the outer diameter of the base 12, and is disposed on the atmosphere side opposite to the casing 1 with respect to the base 12. The seal cover 17 is fixed to the base 12 through the bolts 18 along the axial direction. The seal cover 17 and the base 12 are sealed with seal packing. As shown in FIG. 2, a gap portion 19 having substantially the same inner diameter communicating with the opening portion 13 of the base 12 is provided in the inner peripheral portion of the seal cover 17, and a cylindrical cover member 20 is disposed on the inner peripheral wall thereof. Has been. The inside of the cover member 20 forms a sealing liquid chamber 21 that is formed around the rotary shaft 2 and is filled with a sealing liquid made of fluid (pumped water) handled by the fluid machine.

  A sleeve 22 is fitted on the rotary shaft 2 so as to be located in the housing 11. The sleeve 22 is fixed to the rotating shaft 2 by a fixing member 23 so as not to move, and rotates integrally with the rotating shaft 2. The sleeve 22 and the rotary shaft 2 are sealed with seal packing.

  A holder 24 is fixed to the sleeve 22 so as to be positioned on the casing 1 side in the sealing liquid chamber 21. A part of a driven ring 25 that rotates integrally with the rotary shaft 2 is accommodated in the holder 24. The follower ring 25 is non-rotatable with respect to the holder 24 (rotating shaft 2), but is arranged so as to be movable in the axial direction of the rotating shaft 2. A seal packing is disposed between the driven ring 25 and the sleeve 22. A compression ring 26 is disposed between the driven ring 25 and the holder 24. A spring 27 is provided between the compression ring 26 and the holder 24 for elastically urging the driven ring 25 along the axis of the rotary shaft 2 toward the atmosphere.

  A seat ring 28 is disposed on the atmosphere side in the sealing liquid chamber 21, that is, on the front end of the driven ring 25 urged by the spring 27. The seat ring 28 is held in the sealing liquid chamber 21 so as not to rotate by inserting a pin 29 fixed to the seal cover 17. The seat ring 28 and the seal cover 17 are sealed with seal packing. The driven ring 25 and the seat ring 28 are formed so that the facing positions along the axial direction of the rotary shaft 2 are perpendicular to the axis of the rotary shaft 2. Then, when the driven ring 25 is elastically pressed against the seat ring 28 by the urging force of the spring 27, the abutting portion forms the sliding surface 30 that seals the sealing liquid chamber 21 against the atmosphere side. Configure.

  As shown in FIG. 1, a heat dissipating member 31 for cooling the sealing liquid is disposed on the outer peripheral portion of the seal cover 17 that is the outer peripheral portion of the sealing liquid chamber 21. The heat dissipating member 31 includes an annular mounting portion 32 that is arranged by being moved and fitted in the axial direction with respect to the seal cover 17. The mounting portion 32 is provided with a bolt hole 33 penetrating in the axial direction and fixed to the base 12 by a bolt 34. A plurality (three in the present embodiment) of fin portions 35 </ b> A to 35 </ b> C that protrude along the axial direction of the rotating shaft 2 are provided on the outer peripheral portion of the mounting portion 32. As shown in FIGS. 3 and 4, each of the fin portions 35 </ b> A to 35 </ b> C includes an annular convex portion having the same axis and different diameters. Each of the fin portions 35A to 35C has a hollow shape in which one end side in the axial direction is opened and the other end side is closed, and the internal space constitutes the sealing liquid channels 36A to 36C. A reinforcing connecting rib 37 is provided between the mounting portion 32 and the fin portions 35A to 35C. Moreover, you may give the coating and coating for improving thermal conductivity to the surface of each fin part 35A-35C.

  The casing 1 side of the heat radiating member 31, that is, the opening side of each of the fin portions 35 </ b> A to 35 </ b> C is closed by a closing member 38. The closing member 38 is made of an annular plate material fitted to the opening side end face of the heat radiating member 31. The closing member 38 is provided with a bolt hole 39 corresponding to the bolt hole 33 of the heat radiating member 31, and is fixed together by bolting the heat radiating member 31. In addition, between the closing member 38 and the heat radiating member 31 and between the closing member 38 and the casing 1 are sealed with seal packing.

  The heat dissipating member 31 of the present embodiment has a configuration in which an inflow passage 45 described later is connected to the fin portion 35A located at the radially outer end, and an outflow passage 46 described later is connected to the fin portion 35C at the radially inner end. Yes. The closing member 38 is provided with an inlet side connection port 40 communicating with the inflow path 45 so as to be positioned in the sealing liquid flow path 36A of the fin portion 35A. The heat dissipating member 31 is provided with an outlet side passage 41 communicating with the outflow passage 46 in the mounting portion 32 further radially inward of the fin portion 35C. The outlet side passage 41 penetrates from the opening side end surface toward the inner peripheral portion, and the opening portion 13 on the inner peripheral portion side constitutes the outlet side connection port 42. Further, the heat dissipating member 31 is provided with an annular groove 43 that is expanded outward in the radial direction at the center of the inner peripheral portion where the outlet side connection port 42 is formed. On both sides of the annular groove 43 in the axial direction, seal packing for sealing the space between the seal cover 17 and the seal cover 17 is disposed.

  Further, the closing member 38 is provided with communication passages 44A to 44C for communicating the fin portions 35A to 35C and the outlet side passage 41 adjacent in the radial direction. The communication path 44A is for communicating the sealing liquid flow paths 36A and 36B in the fin portions 35A and 35B, and is provided at a position facing the inlet side connection port 40 in the radial direction. The communication path 44B communicates the sealing liquid flow paths 36B and 36C in the fin portions 35B and 35C, and is provided at a position facing the communication path 44A in the radial direction. The communication path 44C communicates the sealing liquid flow path 36C in the fin portion 35C with the outlet-side path 41, and is provided at a position facing the communication path 44B in the radial direction. Moreover, each communication path 44A-44C has a pair of through-hole penetrated to the sealing liquid flow paths 36A-36C to communicate, and a continuous groove provided so that these through-holes may be continued. It is a configuration.

  As shown in FIG. 1, the housing 11 communicates with the sealing liquid chamber 21 and the sealing liquid flow paths 36 </ b> A to 36 </ b> C of the heat dissipating member 31 to circulate and supply the sealing liquid, and An outflow channel 46 is provided. The inflow path 45 is provided so as to extend radially outward from the opening 13 with respect to the base 12 so as to be continuous with the inlet side connection port 40 of the closing member 38. The outflow passage 46 is provided so as to penetrate the seal cover 17 in the radial direction so as to be continuous with the outlet side connection port 42 (annular groove 43) of the heat dissipation member 31. In the present embodiment, the cover member 20 provided on the inner peripheral portion of the seal cover 17 is provided with an outflow portion 47 that communicates with the outflow passage 46. The outflow portion 47 is configured such that the sealing liquid is discharged onto the sliding surface 30 between the driven ring 25 and the seat ring 28.

  A pump ring 48 that is fixed to the sleeve 22 and rotates integrally with the rotary shaft 2 is disposed in the opening 13 that is the inlet side of the inflow path 45. As shown in FIG. 2, a labyrinth 49 for blocking the inflow of pumped water in the casing 1 is provided on the outer periphery of the pump ring 48 on the casing 1 side. 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 48 on the sealing liquid chamber 21 side. A blade portion 50 is formed by a portion where the groove is not formed. The blade portion 50 is a circulating means for causing the sealing liquid in the sealing liquid chamber 21 to flow radially outward and to circulate from the inflow path 45 to the sealing liquid chamber 21 through the heat radiation member 31 and the outflow path 46. Configure.

  In the present embodiment, a fan 51 that blows cooling air toward the casing 1 side is disposed on the atmosphere side of the heat radiating member 31. The fan 51 is fixed to the sleeve 22 and rotates integrally with the rotation shaft 2. A duct member 52 is disposed on the outer periphery of the housing 11 so as to cover the fan 51 and the heat dissipation member 31. The duct member 52 is provided with a notch 53 at the front end side in the air blowing direction by the fan 51.

  The mechanical seal 10 configured as described above prevents the pumped water in the casing 1 from flowing into the housing 11 by the labyrinth 49 by rotating the pump ring 48 when the rotating shaft 2 of the fluid machine is rotated. . Further, the sealing liquid in the sealing liquid chamber 21 is prevented from leaking to the atmosphere side by the sliding surface 30 where the driven ring 25 and the sheet ring 28 are in sliding contact. The frictional heat generated by the sliding contact between the driven ring 25 and the seat ring 28 is removed by the sealing liquid. The sealing liquid heated by adsorbing the frictional heat flows to the inflow path 45 of the base 12 by the blade portion 50 of the pump ring 48, passes through the heat radiating member 31, is cooled, and then passes through the outflow path 46. Circulatingly supplied into the sealing liquid chamber 21.

  Specifically, as shown in FIG. 5, the sealing liquid that has flowed into the inflow path 45 of the base 12 flows into the sealing liquid flow path 36 </ b> A in the first fin portion 35 </ b> A from the inlet side connection port 40. In the sealing liquid flow path 36A, after diverting to both sides, it flows into the communication path 44A located at the lower end, and flows into the sealing liquid flow path 36B in the second fin portion 35B in communication. In the sealing liquid flow path 36B, after diverting to both sides in the same manner as described above, it flows into the communication path 44B located at the upper end, and flows into the sealing liquid flow path 36C in the communicated third fin portion 35C. In the sealing liquid channel 36 </ b> C, the gas flows into both sides and then flows into the communication path 44 </ b> C located at the lower end and flows into the communicated outlet side path 41. Then, it is circulated and supplied from the outlet side passage 41 to the sealing liquid chamber 21 from the outlet portion 47 of the cover member 20 through the outlet passage 46 of the seal cover 17.

  At this time, the heat dissipating member 31 of the present embodiment is cooled (heat dissipated) by the fan 51 that rotates in conjunction with the rotating shaft 2. Moreover, the cooling efficiency of the heat radiating member 31 is improved by providing the duct member 52. As a result, the sealing liquid that passes through the sealing liquid flow paths 36 </ b> A to 36 </ b> C of the heat radiating member 31 is sufficiently cooled by the heat exchange action and is circulated and supplied to the sealing liquid chamber 21.

  As described above, in the mechanical seal 10 of the present embodiment, the heat dissipating member 31 having the sealing liquid flow paths 36A to 36C is disposed on the outer peripheral portion of the sealing liquid chamber 21 of the housing 11, and the sealing liquid flow paths 36A to 36A are arranged. The housing 11 is provided with an inflow path 45 and an outflow path 46 that allow 36C and the sealing liquid chamber 21 to communicate with each other. Therefore, it is not necessary to provide ancillary equipment such as a pipe for sealing liquid with respect to the housing 11, so that space can be saved and the degree of freedom in design and production can be improved. And sealing liquid can be efficiently cooled in sealing liquid flow path 36A-36C of each fin part 35A-35C.

  Further, since the sealing liquid is circulated and supplied to the sealing liquid chamber 21 after flowing into the fin part 35C from the fin part 35A at the outer end via the fin part 35B, a sufficient distance (time) for cooling is sufficient. Can be secured. Therefore, the sealing liquid can be reliably and efficiently cooled. In addition, more efficient cooling can be performed by the fan 51 and the duct member 52 that rotate integrally with the rotating shaft 2. Moreover, since the heat barrier part 16 is provided between the housing 11 and the casing 1 and heat conduction from the casing 1 to the housing 11 is reduced, the cooling efficiency of the sealing liquid in each fin part 35A to 35C is improved. This can be further improved.

  Furthermore, the housing 11 of the present embodiment includes a base 12 fixed to the casing 1 and a seal cover 17 fixed to the base 12, and a heat dissipation member 31 is disposed on the outer periphery of the seal cover 17. is there. Accordingly, as shown in FIG. 6, the driven ring 25 and the seat ring 28 can be integrally removed together with the rotating shaft 2 and the sleeve 22 by releasing the fixing of the bolt 18 of the seal cover 17. Therefore, cleaning at the time of maintenance and parts replacement can be easily performed.

(Second Embodiment)
FIG. 7 shows a mechanical seal 10 of the second embodiment. This second embodiment is different from the first embodiment in that the protrusion amount (full length) of the fin portions 35A to 35C of the heat radiating member 31 is gradually reduced from the outer end to the inner end in the radial direction. In the first embodiment configured as described above, the same operations and effects as the first embodiment can be obtained. And in 2nd Embodiment, it has the structure where ventilation is easy to escape by the fan 51 outside. Therefore, the cooling efficiency can be further improved.

(Third embodiment)
FIG. 8 shows the heat radiating member 31 of the mechanical seal 10 of the third embodiment. The third embodiment is different from the first embodiment in that the heat dissipating member 31 is constituted by two fan-shaped heat dissipating portions 54A and 54B. Each of the fan-shaped heat radiating portions 54A and 54B includes a mounting portion 32 having a bolt hole 33 and having a predetermined angle (120 degrees in this embodiment). Fin portions 35 </ b> A to 35 </ b> C are formed on the outer peripheral portion of each mounting portion 32. The fin portions 35 </ b> A to 35 </ b> C are hollow arc-shaped convex portions that are open at one end in the axial direction and closed at the other end. The inside of each fin part 35A-35C comprises sealing liquid flow path 36A-36C, The opening side is obstruct | occluded by the obstruction | occlusion member 38. FIG.

  The closing member 38 is provided with an inlet side connection port 40 communicating with the inflow passage 45 so as to be positioned at one end side in the circumferential direction of the fin portion 35A, and is positioned at the other end side in the circumferential direction of the fin portion 35C. In addition, an outlet side passage 41 and an outlet side connection port 42 communicating with the outflow passage 46 are provided. The housing 11 (not shown) is provided with a pair of inflow passages 45, 45 in the base 12, and the seal cover 17 is provided with a pair of outflow passages 46, 46.

  In the third embodiment configured as described above, the same operations and effects as the first embodiment can be obtained. Moreover, since the cooling air by the fan 51 can pass between the fan-shaped heat radiation portions 54A and 54B adjacent in the circumferential direction, the cooling efficiency of the sealing liquid via the heat radiation member 31 can be improved. The heat radiating member 31 is not limited to the two fan-shaped heat radiating portions 54A and 54B, and may be divided into three or more. Further, the protruding amounts in the axial direction of the fin portions 35A to 35C may be provided equally as in the first embodiment, or may be provided so as to increase toward the center as in the second embodiment.

(Fourth embodiment)
FIG. 9 shows a heat radiating member 31 of the mechanical seal 10 of the fourth embodiment. The fourth embodiment is different from the respective embodiments in that one fin portion 35 spirally wound around a circular heat radiating member 31 is provided. That is, the heat radiating member 31 includes a mounting portion 32 having a bolt hole 33 at the center, and a fin portion 35 formed of a spiral convex portion is provided on the outer peripheral portion so that the radius gradually increases. The fin portion 35 is open at one end side and closed at the other end side, and constitutes a sealing liquid channel 36 in which the internal space is continuous. The closing member 38 that closes the opening side of the fin portion 35 is provided with an inlet side connection port 40 that communicates with the inflow path 45 so as to be positioned at the radially outer end of the fin portion 35. An outlet side passage 41 and an outlet side connection port 42 communicating with the outflow passage 46 are provided so as to be positioned at the inner end of the outlet side 46.

  In the fourth embodiment configured as described above, the sealing liquid flowing in from the outer end of the fin portion 35 flows while rotating in one direction toward the center, and is cooled in the meantime. Therefore, the same operations and effects as those of the first embodiment can be obtained. Moreover, since the number of holes formed in the closing member 38 can be reduced in the fourth embodiment, the number of seal packings for sealing can be reduced. In addition, the protrusion amount of the fin part 35 may be provided equally as in the first embodiment, or may be provided so as to gradually increase toward the center as in the second embodiment.

  In addition, the mechanical seal 10 of this invention is not limited to the structure of the said embodiment, A various change is possible.

  For example, in the first to third embodiments, the sealing liquid is caused to flow from the fin portion 35A located at the outer end and the sealing liquid is caused to flow out from the fin portion 35C located at the inner end. It is good also as a structure which makes a sealing liquid flow in from the fin part 35C located, and makes a sealing liquid flow out from the fin part 35A located in an outer side end. Similarly, in the fourth embodiment, the sealing liquid is allowed to flow from the outer end of the fin portion 35 and the sealing liquid is allowed to flow from the inner end. However, the sealing liquid is allowed to flow from the inner end and from the outer end. It is good also as a structure which flows out sealing liquid. Moreover, in the embodiment, the outflow passage 46 is provided in the seal cover 17 and the outflow passage 46 and the fin portions 35 and 35A to 35C are connected via the outlet side passage 41. However, the base 12 and the seal cover 17 It is good also as a structure which provides the outflow channel connected to, and provides the exit side connection port in the closure member 38.

  Further, in each embodiment, one inlet side connection port 40 and one outlet side connection port 42 are provided in one heat radiating member 31 (in the third embodiment, fan-shaped heat radiating portions 54A and 54B). It is good also as a structure provided 2 or more according to the fluid flow condition. In particular, two or more outlet side connection ports 42 (outlet side passages 41) corresponding to the outflow passages 46 (outflow portions 47) are provided at predetermined intervals in the circumferential direction, which tends to cool the fixed seat ring 28. Is preferable because it does not occur. Of course, the number of the inlet side connection ports 40 and the number of the outlet side connection ports 42 may be different, and the opening area (diameter) may be changed according to the flow path resistance. Thereby, the passage time of the sealing liquid passing through the heat radiating member 31 can be adjusted.

  Further, the fin portions 35, 35A to 35C may be provided with plate-like fins or protrusions protruding outward so that the cooling performance can be further improved. In addition, instead of the fan 51, a forced cooling box surrounding the fin portions 35, 35A to 35C of the heat radiating member 31 is provided, and external cooling water can be circulated and supplied into the forced cooling box. Also good.

DESCRIPTION OF SYMBOLS 1 ... Casing 2 ... Rotating shaft 10 ... Mechanical seal 11 ... Housing 12 ... Base 16 ... Heat barrier part 17 ... Seal cover 21 ... Sealing liquid chamber 22 ... Sleeve 25 ... Drive ring (rotating ring)
28 ... Seat ring (fixed ring)
DESCRIPTION OF SYMBOLS 30 ... Sliding surface 31 ... Radiation member 35, 35A-35C ... Fin part 36, 36A-36C ... Sealing liquid flow path 38 ... Closure member 40 ... Inlet side connection port 41 ... Outlet side channel 42 ... Outlet side connection port 44A 44C ... Communication passage 45 ... Inlet passage 46 ... Outlet passage 47 ... Outlet portion 51 ... Fan 52 ... Duct members 54A, 54B ... Fan-shaped heat radiation portion

Claims (9)

A housing fixed to the casing of the fluid machine in a state of passing through the rotating shaft of the fluid machine, and forming a sealing liquid chamber around the rotating shaft;
A rotating ring disposed rotatably in the sealing liquid chamber of the housing and rotating integrally with the rotating shaft;
A fixed ring that is non-rotatably disposed in the sealing liquid chamber of the housing and that forms a sliding surface by contacting the rotary ring;
A fin portion fixed to the housing and projecting in the axial direction of the rotating shaft; and a heat dissipating member having a sealing liquid channel formed in the fin portion;
An inflow path and an outflow path formed in the housing and communicating the sealing liquid chamber and the sealing liquid flow path of the heat dissipation member;
Circulating means disposed on the rotary shaft and circulates the sealing liquid in the sealing liquid chamber from the inflow path to the sealing liquid chamber through the sealing liquid flow path and the outflow path. And mechanical seal. The fin portion is composed of a plurality of annular convex portions having different diameters with one end side in the axial direction being opened and the other end side being closed, and the internal space being the sealing liquid flow path.
Claim 1, wherein said having a closing member for closing the opening side of each fin portion, the communication passage is provided for communicating the sealing liquid flow path adjacent the closing member in the radial direction The mechanical seal as described in. The fin portion is formed of a plurality of arc-shaped convex portions having different diameters with one end side in the axial direction being opened and the other end side being closed, and the inner space being the sealing liquid flow path.
Claim 1, wherein said having a closing member for closing the opening side of each fin portion, the communication passage is provided for communicating the sealing liquid flow path adjacent the closing member in the radial direction The mechanical seal as described in. The inflow passage is connected to the fin portion at the radially outer end or inner end of the fin portions, and the outflow passage is connected to the fin portion at the radially inner end or outer end . The mechanical seal according to claim 2, wherein the mechanical seal is provided. The fin portion is formed of a spiral convex portion whose one end side in the axial direction is opened and the other end side is closed, and whose internal space is the sealing liquid flow path,
While having a closing member that closes the opening side of the fin portion,
The inflow passage is connected to an outer end or an inner end in the radial direction of the fin portion, and the outflow passage is connected to an inner end or an outer end in the radial direction of the fin portion. The mechanical seal according to 1. The mechanical seal according to any one of claims 1 to 5, wherein a fan for blowing cooling air to the heat radiating member is disposed on the rotating shaft. The mechanical seal according to claim 6, wherein a duct member that covers the heat radiating member and the fan is disposed on an outer peripheral portion of the housing. The housing includes a base that is fixed to the casing, and a seal cover that is fixed so as to be positioned on the opposite side of the casing with respect to the base and in which the sealing liquid chamber is formed,
The heat dissipation member, said in a state of being disposed in a liquid-tight manner to the outer peripheral portion of the seal cover, the mechanical seal according to any one of claims 1 to 7, characterized in Tei Rukoto secured to said base . The mechanical seal according to any one of claims 1 to 8, wherein a heat barrier portion is provided between the housing and the casing.

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