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
  • F16J15/3436—Pressing means
  • F16J15/344—Pressing means the pressing force being applied by means of an elastic ring supporting the slip-ring
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/08—Sealings
  • F04D29/10—Shaft sealings
  • F04D29/12—Shaft sealings using sealing-rings
  • F04D29/126—Shaft sealings using sealing-rings especially adapted for liquid pumps
• • 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
  • F16J15/38—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member sealed by a packing

Definitions

• the present invention relates t ⁇ a rotary mechanical seal for rotating shafts passing into a pressure vessel, and in particular, to such a seal for a slurry pump.
• each seal ring having a lapped seal face opposing the seal face on the other ring.
• Resilient means such as coil springs and/or bellows urge one seal ring face towards the other in sealing relation.
• Prior art seals rely on an elastomeric annular member in a fully surrounded close clearance groove to keep the pumped product from leaking, whilst providing the resilience in the axial direction to ensure the spring force is transmitted to the stationary face.
• Figure 1 Shown in Figure 1 is a typical mechanical seal. This utilises a coil spring 1 to urge the stationary sealing ring face 2 toward the rotating sealing ring 3.
• An elastomeric annular member in this case an O-ring provides the seal between the axially adjustable stationary holder 5 and the seal housing 6. This mechanical seal is susceptible to failure because of clogging of particles in the small gap 7.
• the present invention seeks to ameliorate this disadvantage by providing an elastomeric annular member of suitable size, and a groove of appropriate design so as to obviate clogging or crystalising in the gap between the seal face holder and the housing.
• Figure 3 illustrates a second embodiment utilising a duality of annular sealing elements where both stationary and rotating elements are spring urged towards each other.
• Figure 4 describes the size and shape of the groove for the elastomeric annular member.
• the stationary housing 8 projects into the pump casing and contains seal face 12.
• the rotating seal face carrier 9 being spring urged by an elastomeric member in compression 13.
• the rotating seal holder 10 contains the groove of the present ivention and the elastomeric annular member 11.
• Figure 3 shows two seal face carriers 9, both resiliently mounted in the annular elastomeric member 11, and spring urged by elastomeric member 13.
• Figure 4 shows details of the groove of one embodiment of the present invention.
• Angle 14 is shallow, preferably less than 45 degrees to avoid hang-up of material or bridging across the gap between point 16 and the seal face holder or carrier 17.
• Angle 15 is shallow, preferably less than 45 degrees, and designed to provide retention of the elastomeric member during installation and adjustment.
• the cross-sectional area of the groove is such that the annular elastomeric member 11 should protrude or be equal in protrustion to the point 16 of the seal housing 17.
• the point 16 should be no less in height than half the overall groove height to ensure maximum resilience of the elastomer in transmiting the spring forces.
• the cross-sectional shape of the elastomeric member is not 30 critical, and standard O-ring or rectangular sections may be adopted.
• the major benefit of the above features is to allow the seal carrier to remain axially free within the housing and to transmit the spring force to the faces.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Mechanical Sealing (AREA)
• Diaphragms And Bellows (AREA)
• Reciprocating Pumps (AREA)
• Sealing Material Composition (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=3772308

Family Applications (1)

Country Status (3)

Citations (3)

Family Cites Families (2)

• 1988
  • 1988-06-29 AU AU19904/88A patent/AU612384B2/en not_active Ceased
  • 1988-06-29 EP EP19880905607 patent/EP0328568A4/en not_active Withdrawn
  • 1988-06-29 WO PCT/AU1988/000220 patent/WO1989000247A1/en not_active Application Discontinuation

Patent Citations (3)

Non-Patent Citations (1)

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