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
  • F16J15/36—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member connected by a diaphragm or bellow to the other member
  • F16J15/363—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member connected by a diaphragm or bellow to the other member the diaphragm or bellow being made of metal
• • 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
  • F16J15/3464—Mounting of the seal
  • F16J15/3468—Means for controlling the deformations of the contacting faces

Definitions

• the present invention relates to a mechanical seal assembly with a coated bellows unit for ensuring a function of the bellows unit.
• the mechanical seal assembly according to the invention with the features of claim 1 has the advantage that deposits on a bellows element of a bellows unit can be prevented. Thereby, a life and reliability of the bellows unit and in particular a mobility of a bellows member can be maintained for a long time.
• the bellows unit comprises a bellows element, a bellows carrier and a sliding ring carrier.
• the bellows element is fluid-tightly connected to the bellows carrier and the sliding ring carrier.
• the bellows element has a non-stick coating on a product side which is in contact with the medium to be sealed.
• the complete product side of the bellows unit i.e., the bellows member, the bellows carrier and the slip ring carrier, has the coating.
• the bellows element is a metal bellows, in particular with a large number of bellows folds.
• a sliding ring is loosely inserted into the slip ring carrier of the bellows unit. As a result, stresses or distortions or the like. Can be avoided in the sliding ring.
• the complete bellows unit is provided with a non-stick coating on one product side, i.e., the flexible bellows member, the bellows carrier and the slip ring carrier.
• the metal bellows is already attached to the bellows support and the slip ring carrier, e.g. welded.
• the sliding ring need not be arranged in the sliding ring carrier, since the sliding ring is later loosely inserted into the slip ring carrier.
• the non-stick coating is a DLC coating.
• DLC coatings have very good non-stick properties and can be easily and inexpensively applied to the product side of the bellows unit with a relatively small thickness.
• the non-stick coating preferably has a thickness in a range of 1/200 to 1/10, in particular 1/100 of a bellows thickness. This ensures that a dimension of the bellows unit changes only minimally in the radial direction through the coating.
• the Thickness of the coating on the bellows unit is preferably in a range of 0.1 ⁇ to 20 ⁇ and is in particular in a range of 0.7 ⁇ to 3 ⁇ .
• the mechanical seal assembly further comprises a first sleeve having a first annular flange at a first end, and preferably a second annular flange at a second end.
• the first sleeve is provided to connect the loosely fitted slip ring with the slip ring carrier.
• the slide ring carrier has a groove for receiving the first annular flange, wherein between the groove and the first annular flange a snap connection is provided.
• the snap connection is thus provided by an undercut, so that a quick and easy Lanemontage the first sleeve on Gleitringmik is possible.
• the first sleeve comprises a second annular flange and the loosely mounted sliding ring has a shoulder on a side facing the other sliding ring side.
• the bellows member has a plurality of bellows creases, each bellows fold having a maximum depth which is equal to or less than a double maximum width of the bellows fold. This definition of the depth to the width of the bellows fold ensures that all areas of the bellows fold can be coated.
• a secondary seal in particular an O-ring, is arranged between the loosely inserted slide ring and the slide ring carrier.
• the secondary seal is used in particular to fix the loosely inserted slide ring in Gleitringong. The fixation by means of the secondary seal thereby ensures that no undesirable stresses or the like. Are introduced into the loosely inserted seal ring.
• the secondary seal is preferably provided in an annular recess on the sliding ring carrier.
• a ratio of a hardness of the coated bellows member to an modulus of elasticity of the coated bellows member is in a range of 1: 6 to 1: 8.
• the ratio of hardness to modulus of coated Balgelements is particularly preferably 1: 7.
• the non-stick coating is provided on the bellows unit throughout.
• the non-stick coating is entirely provided on a product side, i.e., all areas of the bellows unit which are in contact with the medium to be sealed.
• a first welded connection is formed between the metal bellows and the bellows carrier, and a second welded connection is formed between the metal bellows and the sliding ring carrier.
• the two welds are preferred before Coating of the bellows unit made to prevent damage to the coating by subsequent welding operations.
• the bellows unit has a first non-stick coating on the product-facing side and a second non-stick coating on the atmosphere side.
• the bellows unit and in particular the bellows element is coated from both sides.
• deposits on the atmosphere side of the bellows unit may also be prevented from forming deposits or the like.
• a thickness of the second coating is particularly preferably equal to a thickness of the first coating.
• the coatings are preferably the same. More preferably, the bellows unit, i. the bellows element, the bellows carrier and the sliding ring carrier, completely coated from both sides.
• the mechanical seal assembly according to the invention is particularly preferably used for sealing media in which deposits often occur.
• Such media are, for example, liquid concrete or hot water, with limescale often arise in hot water.
• Fig. 1 is a schematic sectional view of a mechanical seal assembly according to a first embodiment of the invention
• FIG. 2 is a schematic sectional view of a bellows unit of FIG. 1;
• FIG. 3 is a schematic sectional view of a loop of a bellows element of FIG. 2; and FIG. 4 is a schematic sectional view of a loop of a bellows element of FIG.
• the mechanical seal assembly 1 comprises a mechanical seal with a rotating seal ring 2 and a stationary seal ring 3, which define a sealing gap 4 between them.
• the mechanical seal assembly 1 comprises a bellows unit 5, which can be seen in detail from FIG.
• the bellows unit 5 comprises an elastic bellows element 50, a bellows carrier 51 and a sliding ring carrier 52.
• the elastic bellows element 50 is a bellows made of a metal material, in particular spring steel.
• the bellows element is provided as a round bellows. It should be noted that a bellows with sharp folds can be provided as a flexible bellows element.
• a side of the bellows unit 5 facing a product 7 has a non-stick coating 6.
• the non-stick coating 6 is a DLC coating in this embodiment.
• the non-stick coating 6 is completely provided on the side of the bellows unit 5 directed towards the product 7.
• the coating 6 has no interruption or the like. On.
• the bellows support 51 as shown in Fig. 2, further provided a threaded bore 54, which has no coating.
• the threaded bore 54 is covered during the coating process, for example with a plug.
• the bellows unit 5 can be fixed to a second sleeve 12 (see FIG.
• the second sleeve 12 serves to fix the bellows carrier 51 on the shaft 15.
• the non-stick coating 6 has a constant first thickness D1, which has approximately 1/100 of a constant second thickness D2 of the bellows element 50.
• the size ratios of the thicknesses D1 and D2 are not shown to scale for ease of illustration.
• the non-stick coating 6 is completely formed in a bellows fold of the bellows element 50.
• a width B of the bellows fold is defined by a distance between two radially outermost points 16, 17 delimiting the bellows fold.
• a depth T of the bellows crease is defined by a distance of a radially innermost point 18 of the bellows crease to the line connecting the two radially outermost points.
• a depth T corresponds to a double width B of the bellows fold.
• the thickness D1 of the non-stick coating 6 is in a range of 0.1 ⁇ to 20 ⁇ and is in particular between 0.7 ⁇ and 3 ⁇ .
• a secondary seal 9 is provided in the form of an O-ring between the rotating seal ring 2 and the Gleitringanii 52.
• the secondary seal 9 is arranged in a first groove 53 in the sliding ring carrier 52.
• the secondary seal 9 prevents product 7 from the product side to an atmosphere side 70 along the side facing away from the stationary seal ring 3 region of the rotating seal ring 2 passes.
• the stationary seal ring 3 is fixed to a housing 30. The secondary seal 9 thus clamps the rotating seal ring 2 between the slide ring carrier 52 and the first sleeve 1 1 a.
• the Gleitringica 52 takes, as shown in Fig. 1 it can be seen, the rotating seal ring 2 loose.
• the rotating seal ring 2 is fixed at its inner circumference by a first sleeve 1 1.
• the first sleeve 1 1 comprises a cylindrical main body 20, a first annular flange 21 at a first end and a second annular flange 22 at a second end.
• a snap connection 10 is formed between the first annular flange 21 and a second groove 55 in the slip ring carrier 52.
• the snap connection 10 is joined by simple axial sliding of the Gleitringaniis 52 on the first sleeve 1 1.
• the second annular flange 22 prevents in the loosely assembled state of the rotating seal ring 2 that the rotating seal ring 2 is moved in the axial direction X-X in the direction of the stationary seal ring 3.
• the flexible bellows element 50 is connected to the bellows carrier 51 by means of a first weld seam 13 with the sliding ring carrier 52 and a second weld seam 14.
• the bellows element 50 is thus first welded to the bellows carrier 51 and the sliding ring carrier 52.
• the coating then takes place with the non-stick coating 6 of the bellows unit 5, the side of the bellows unit 5 facing the product 7 being completely coated.
• any existing openings with plugs or covers or the like Covered to prevent a coating on inner areas, which are later directed to the atmosphere side 70 in the assembled state, is present.
• the one-sided coating of the bellows unit 5 on the side directed towards the product 7 thus prevents deposits from forming on the side of the bellows unit 5 facing the product 7.
• the non-stick coating 6 prevents the adhesion of such particles.
• the bellows unit 5 of the second embodiment thus comprises a first non-stick coating 6, on the side of the elastic bellows element 50 facing the product 7 and a second non-stick coating 60 on the side of the elastic bellows element 50 facing the atmosphere side 70.
• the second non-stick coating 60 has a third thickness D3.
• the third thickness D3 is equal to the first thickness D1.
• the first and second release coatings are each DLC coatings.
• the two-sided coating of the elastic bellows element 50 ensures that, if the medium to be sealed leaks through the sealing gap between the sliding rings to the atmosphere side 70, deposition on the elastic bellows element 50 on the atmosphere side 70 is prevented.
• a particularly long life and mobility of the bellows unit 5 can be ensured.
• the complete bellows unit, ie the elastic bellows element 50, the bellows support 51 and the sliding ring carrier 52 is completely provided with the non-stick coating.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Mechanical Sealing (AREA)
• Diaphragms And Bellows (AREA)
• Sealing Devices (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=58671579

Family Applications (1)

Country Status (6)

Families Citing this family (1)

Family Cites Families (15)

• 2016
  • 2016-06-30 DE DE102016211816.1A patent/DE102016211816B4/de not_active Expired - Fee Related
• 2017
  • 2017-04-18 CA CA3026147A patent/CA3026147C/en not_active Expired - Fee Related
  • 2017-04-18 CN CN201780039838.3A patent/CN109416127A/zh active Pending
  • 2017-04-18 US US16/311,501 patent/US20190195367A1/en not_active Abandoned
  • 2017-04-18 EP EP17721543.1A patent/EP3478993A1/de not_active Withdrawn
  • 2017-04-18 WO PCT/EP2017/059183 patent/WO2018001592A1/de unknown

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