GB2603761A - Mechanical seal bellows - Google Patents

Mechanical seal bellows Download PDF

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Publication number
GB2603761A
GB2603761A GB2101837.9A GB202101837A GB2603761A GB 2603761 A GB2603761 A GB 2603761A GB 202101837 A GB202101837 A GB 202101837A GB 2603761 A GB2603761 A GB 2603761A
Authority
GB
United Kingdom
Prior art keywords
hvof
resistance
bellows
coating
shall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB2101837.9A
Other versions
GB2603761B (en
Inventor
Colverson Andrew
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AES Engineering Ltd
Original Assignee
AES Engineering Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AES Engineering Ltd filed Critical AES Engineering Ltd
Priority to GB2101837.9A priority Critical patent/GB2603761B/en
Publication of GB2603761A publication Critical patent/GB2603761A/en
Application granted granted Critical
Publication of GB2603761B publication Critical patent/GB2603761B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F16J15/3452—Pressing means the pressing force resulting from the action of a spring
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C23C4/123—Spraying molten metal
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material
    • C23C4/08—Metallic material containing only metal elements
    • 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
    • F16J15/348—Pre-assembled seals, e.g. cartridge seals
    • 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
    • F16J15/3496—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member use of special materials
    • 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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying

Abstract

A mechanical seal assembly for sealing a rotatable shaft against a stationary housing is provided. The mechanical seal assembly comprises: a sealing face 1; a face holder 2, a drive-end 4 and a bellows arrangement 3. The bellows arrangement 3 comprises a plurality of profiles connected at both peak and trough in a stack, to effectively act as a spring for biasing the sealing face 1 to form a seal. The bellows arrangement 3 is at least partially coated by using a High Velocity Oxygen Fuel (HVOF) coating process. The HVOF coating may typically consist of chromium, cobalt, molybdenum, bronze and zirconium.

Description

Mechanical Seal Bellows
Field of the Invention
The present invention relates to a mechanical seal, and specifically aims to improve the wear resistance, corrosion resistance, fatigue resistance, oxidation resistance and/or thermal resistance of said mechanical seal by coating the bellows arrangement with any one of a number of materials with beneficial qualities and properties which are imparted via the use of a High Velocity Oxygen Fuel (HVOF) coating process.
Moreover, this process can also restore the surface finish of used parts which are to be refurbished, as the process can improve or restore the surface finish of said part.
Background to the Invention
Mechanical seals are of commonplace in a multitude of industries for providing a seal between rotating and stationary components. The seal is created by one sealing face rotating against a stationary sealing face.
When specifying mechanical seals for equipment and applications with a high risk of chemical or thermal attack, it is commonplace to opt for a mechanical seal with a bellows arrangement, thus improving the thermal and/or chemical resistance of the mechanical seal. Although the primary reason for selecting a bellows mechanical seal may be to mitigate thermal or chemical attack of elastomeric elements, a bellows mechanical seal may also be selected to compensate for misalignment, vibration or thermal expansion in a given application.
Despite the fact that a bellows seal arrangement performs well in high temperature applications, or those where aggressive chemicals are present, there are applications which exceed the current physical limits of the product in terms of either chemical or thermal resistance, in which case an inventive step is required to improve the resistance of the product to these environments and applications. In this instance, the invention will employ the aforementioned HVOF process to coat the bellows arrangement in a material or materials with beneficial qualities and properties.
The HVOF process is a thermal spraying process in which a spray of high impact, high pressure and high kinetic energy particles is directed at the exposed surfaces of a part in order for a coating layer of material to develop. The spray consists of a fuel and oxygen mix, which is ignited in a combustion chamber, allowing the high pressure gas to be accelerated from the application nozzle towards the part. A powdered coating material is introduced to the high pressure gas mixture as it is sprayed onto the part.
This method of coating provides a very dense high quality coating with a high bond strength and low porosity, consisting of thin overlapping platelets.
Statements of Invention
Accordingly, the present invention is directed to, but not solely to, a bellows mechanical seal assembly for sealing a rotatable shaft to a fixed housing, said seal comprising rotational components fixed relative to the shaft and stationary components fixed relative to the housing, said rotational component(s) comprising a bellows arrangement of seal face, face holder, drive-end and bellows consisting of a stack of a plurality of profiles welded together at both peak and trough to effectively act as a spring to provide seal face pressure.
Said bellows arrangement shall be coated in a layer of a material with beneficial qualities and properties where the application warrants, such as in high temperature or arduous chemical environments.
Preferably said coating is imparted to the bellows arrangement components through the use of an HVOF coating method.
More preferably, said HVOF coating shall consist of a material or materials whose properties are desirable and beneficial to the finished product.
More preferably, said benefits may include, but are not limited to, improved wear resistance, corrosion resistance, fatigue resistance, oxidation resistance and thermal resistance.
Preferably said HVOF process can be used to produce a variety of coatings.
More preferably, said HVOF coating may consist of, but is not limited to, chromium, cobalt, molybdenum, bronze and zirconium.
More preferably, said HVOF coating may be applied to a variety of surfaces, including, but not limited to, metals, alloys, ceramics and carbides.
Preferably, said HVOF coating is produced to be of uniform thickness.
More preferably, said HVOF coating shall be of a thickness a minimum of 50 microns. However, the coating can have a thickness between 1 and 50 microns in some 20 applications.
Brief Description of the Drawings
The accompanying drawings are as follows: Figure 1 is a cross sectional view of a typical bellows arrangement.
Detailed Description of the Invention
The invention will now be described, by way of examples only, with reference to the 5 accompanying drawings.
Referring to Figure 1 of the accompanying drawings, there is shown the cross sectional view of a typical bellows (3), shown coupled with drive-end (4), face holder (2) and seal face (1) to create the bellows arrangement. The seal face (1) is retained in the face holder (2) by way of a shrink fit. The bellows (3), constructed of a stack of 12 pairs of profiles connected in such a way that they form a spring-like construction, is welded to both the drive-end (4) and the face holder (2).
Any exposed surfaces of the bellows (3), face holder (2) and drive end (4) shown in Figure 1 may be coated with the aforementioned HVOF coating method, with an appropriate material or materials. Said material or materials shall be selected so as to give the finished product improved performance or resistance in a number of key areas such as wear resistance, corrosion resistance, fatigue resistance, oxidation resistance and/or thermal resistance. Moreover, the coating, when applied, shall be of a uniform thickness, and shall have a high bond strength and low porosity, consisting of thin overlapping platelets.

Claims (4)

  1. Claims 1. A mechanical seal assembly for sealing a rotatable shaft to a stationary housing and comprising: a face holder, a drive-end and a bellows arrangement comprising a plurality of profiles connected at both peak and trough in a stack, so as to effectively act as a spring; wherein said bellows arrangement shall be at least partially coated through the use of an HVOF coating process.
  2. 2. A bellows arrangement according to claim 1, wherein said HVOF coating shall be of a material or materials whose properties are desirable, and beneficial to the finished product; wherein said HVOF coating shall improve the wear resistance, corrosion resistance, fatigue resistance, oxidation resistance and/or thermal resistance of the finished product; wherein said HVOF coating shall consist of one or more of a variety of coating materials; wherein said HVOF coating may consist of, but is not limited to, chromium, cobalt, molybdenum, bronze and zirconium; wherein said HVOF coating may be applied to surfaces of which the materials of construction may consist of, but are not limited to, metals, alloys, ceramics and carbides.
  3. An HVOF coated bellows arrangement according to claim 2, wherein said HVOF coating shall be of a uniform thickness, regardless of the complexity of the surface geometry of the part to be coated; Wherein said HVOF coating shall be of a thickness of a minimum of 50 microns.
  4. 4. A method of improving the wear resistance, corrosion resistance, fatigue resistance, oxidation resistance and/or thermal resistance of a bellows mechanical seal comprising at least a portion of the bellows of the seal by a HVOF coating process.
GB2101837.9A 2021-02-10 2021-02-10 Mechanical seal bellows Active GB2603761B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2101837.9A GB2603761B (en) 2021-02-10 2021-02-10 Mechanical seal bellows

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2101837.9A GB2603761B (en) 2021-02-10 2021-02-10 Mechanical seal bellows

Publications (2)

Publication Number Publication Date
GB2603761A true GB2603761A (en) 2022-08-17
GB2603761B GB2603761B (en) 2023-06-14

Family

ID=82493861

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2101837.9A Active GB2603761B (en) 2021-02-10 2021-02-10 Mechanical seal bellows

Country Status (1)

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GB (1) GB2603761B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013220883A1 (en) * 2013-10-15 2015-04-16 Witzenmann Gmbh Flexible metal conduit
WO2016133954A1 (en) * 2015-02-18 2016-08-25 Eaton Corporation Blow-out resistant seal and assembly
EP3450805A1 (en) * 2016-04-27 2019-03-06 Eagle Industry Co., Ltd. Mechanical seal
WO2020128740A1 (en) * 2018-12-21 2020-06-25 Freni Brembo S.P.A. Method of making a brake disc and brake disc for a disc brake

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013220883A1 (en) * 2013-10-15 2015-04-16 Witzenmann Gmbh Flexible metal conduit
WO2016133954A1 (en) * 2015-02-18 2016-08-25 Eaton Corporation Blow-out resistant seal and assembly
EP3450805A1 (en) * 2016-04-27 2019-03-06 Eagle Industry Co., Ltd. Mechanical seal
WO2020128740A1 (en) * 2018-12-21 2020-06-25 Freni Brembo S.P.A. Method of making a brake disc and brake disc for a disc brake

Also Published As

Publication number Publication date
GB2603761B (en) 2023-06-14

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