Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16J—PISTONS; CYLINDERS; SEALINGS
  • F16J15/00—Sealings
  • F16J15/16—Sealings between relatively-moving surfaces
  • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
  • F16J15/3404—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal

Definitions

• the invention relates to a mechanical seal assembly according to the preamble of claim 1, which comprises an integrated heat transfer device.
• Mechanical seal assemblies are known in the prior art in various configurations. During use, relatively high temperatures can occur at the mechanical seal. High temperatures are caused, inter alia, by high temperatures of the medium to be sealed, for example in hot water applications or in applications in the refinery industry and the petrochemical industry. Due to the high temperatures of the media to be sealed, the components of the mechanical seal can also assume relatively high temperatures. However, this can lead to distortions on the sliding surfaces of the sliding rings. This leads in particular to restrictions of the areas of use of the mechanical seals, in particular in applications for hot media.
• the mechanical seal assembly according to the invention has the advantage that it allows improved heat dissipation by providing a built-in the sliding ring heat transfer device. In this case, it is not necessary according to the invention to use large quantities of cooling medium, but a heat occurring at the mechanical seal can be dissipated directly in the vicinity of the place of origin with a reduced amount of coolant.
• an inlet opening for supplying the cooling medium and an outlet opening for discharging the cooling medium are provided on the stationary seal ring.
• the integrated heat transfer device is arranged in an inner region of the stationary sliding ring and connects the inlet opening with the outlet opening.
• a temperature at the mechanical seal in particular directly at a sealing gap between the sliding surfaces of the sliding rings, can be effectively reduced, so that overall an increased service life and better running properties of the mechanical seal arrangement can be achieved.
• any heat generated by friction between the two slip rings can be dissipated directly and quickly.
• any existing dry running of the mechanical seal assembly it is also possible for any existing dry running of the mechanical seal assembly to take place, if appropriate, over a relatively long period of time by virtue of the effective heat dissipation by means of the heat transfer device integrated in the stationary sliding ring.
• the mechanical seal assembly according to the invention also has improved emergency running properties.
• the integrated heat transfer device comprises a porous internal structure, which is arranged in the inner region of the stationary sliding ring.
• the porous inner structure comprises a plurality of interconnected pores, through which the cooling medium can flow. Since the porous inner structure is arranged in the entire interior of the stationary seal ring, can Also, the entire seal ring are flowed through with the cooling medium, so that an effective and uniform cooling can be achieved.
• the porous inner structure preferably forms an entire inner area of the stationary sliding ring, wherein the inner area is delimited by an edge area of preferably constant thickness.
• the porous inner structure is made of silicon carbide.
• an internal structure is first produced by means of PU foam, which is then converted into carbon at high temperatures and then reactively bonded to silicon carbide by enrichment with liquid silicon. This results in an interior area with pores of substantially equal size, with adjacent pores each interconnected.
• the edge region of the stationary sliding ring is also made of silicon carbide.
• the inlet opening is preferably arranged at 180 ° with respect to the outlet opening. This makes it possible for the cooling medium to flow from the inlet opening along both halves of the stationary sliding ring to the outlet opening.
• a diameter of the inlet opening is equal to a diameter of the outlet opening.
• the stationary seal ring is rectangular in section and the porous inner region is also formed uniformly rectangular in section along the circumference.
• a diameter of the inlet opening is approximately one third or more than one third of a width of the inner region of the stationary sliding ring.
• a blocking means of the slip ring sealing arrangement is used as the coolant.
• the mechanical seal assembly of the present invention is particularly useful in hot water applications, in refinery or petrochemical applications, or in critical applications, e.g. in explosion-proof rooms. Also, the mechanical seal assembly according to the invention can be used preferably in multiple seals, in which a flushing and cooling takes place directly with the template or barrier medium.
• Figure 1 is a schematic sectional view of a mechanical seal assembly according to a preferred embodiment of the invention.
• the mechanical seal assembly 1 comprises a stationary seal ring 2, which is arranged on a housing member 11, and a rotating seal ring 3, which is arranged on a rotating shaft 4 and in common with the shaft 4 rotated about a rotation axis XX.
• the rotating seal ring 3 is fixed by means of a fixing device 6 on the rotating shaft 4.
• the fixing device 6 is fixed by means of a screw element 8, e.g. a worm screw, attached to the shaft 4.
• one or more spring elements 7 are arranged in the fixing device 6, which apply in the axial direction of the shaft a biasing force ü- on a thrust washer 9 on the rotating seal ring 3.
• the rotating seal ring 3 is further sealed by means of a first O-ring 10 on the shaft 4.
• a circumferential sealing gap 5 is maintained between the stationary seal ring 2 and the rotating seal ring 3, via which in a known manner a seal between two rooms.
• the stationary sliding ring 2 is constructed in such a way that it encloses an outer edge region 2 a and a peripheral edge region 2 a.
• NEN inner region 2b comprises with rectangular cross-section.
• the inner region 2b is formed as an integrated heat transfer device and is formed by a plurality of individual pores 14, which are each connected to adjacent pores.
• the inner region 2b is formed as a porous inner structure, through which a cooling medium can flow.
• an inlet opening 12 and an outlet opening 13 are formed in the stationary seal ring 2.
• the inlet opening 12 communicates with an inlet bore 17, which is provided in the housing member 11, in connection and the outlet opening 13 communicates with a drain hole 18 in connection.
• the stationary seal ring 2 is sealed relative to the housing component 11 by means of a second and third O-ring 15, 16.
• a cooling medium is supplied through the inlet bore 17 and the inlet opening 12 into the porous interior region 2 b of the stationary sliding ring 2. Since the pores 14 are formed in the entire inner region 2b of the stationary seal ring 2, a connection is formed via the pores 14 between the inlet opening 12 and the outlet opening 13, through which the supplied cooling medium can flow. In this case, since the inlet opening 12 and the outlet opening 13 opposite each other by 180 °, the cooling medium through both ring halves of the stationary seal ring 2 to the outlet port 13 to flow. From the outlet port 13, the cooling medium is then discharged through the drain hole 18 (arrow B).
• the cooling medium can absorb heat and thus allow a temperature drop directly on the stationary seal ring 2 and in particular on the sealing gap 5. Since a diameter of the inlet opening 12 and the outlet opening 13 in each case has approximately one third of a width C of the inner area 2 b, it is ensured that sufficient cooling medium can also flow to the inner edge area 2 a of the stationary sliding ring 2.
• a heat transfer device integrated into the stationary seal ring 2 which ensures direct and immediate removal of heat in the region of the sealing gap 5.
• the multiplicity of pores 14 in the inner region 2 b of the stationary sliding ring 2 thus provide a micro-transmission device, as a result of which, in particular, distortions of the sliding surfaces of the sliding rings 2, 3 can be avoided.
• a preliminary Temperature of the cooling medium easily a defined temperature in the sealing gap 5 can be adjusted, in particular, a temperature of the stationary seal ring 2 can be maintained at a temperature level of the cooling medium.
• a service life of the mechanical seal assembly can be significantly extended and, in addition, the improved heat dissipation in the region of the sealing gap also enables better emergency running properties of the mechanical seal assembly, eg in dry running, which leads to increased friction and thus increased heat.
• the mechanical seal assembly according to the invention is preferably used in applications with higher temperatures or poor lubricating properties of the mechanical seal.
• an upper temperature limit for the hot water can be increased. In this case, the integrated heat transfer device can be provided very inexpensively.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Mechanical Sealing (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 2008
  • 2008-06-18 DE DE202008008158U patent/DE202008008158U1/de not_active Expired - Lifetime
• 2009
  • 2009-06-10 US US12/737,134 patent/US20110169225A1/en not_active Abandoned
  • 2009-06-10 WO PCT/EP2009/004201 patent/WO2009152991A1/de active Application Filing
  • 2009-06-10 JP JP2011513927A patent/JP2011524504A/ja active Pending
  • 2009-06-10 EP EP09765571A patent/EP2286118A1/de not_active Withdrawn

Non-Patent Citations (1)

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