GB2065243A - Improvements to seals between relatively rotatable parts - Google Patents

Improvements to seals between relatively rotatable parts Download PDF

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Publication number
GB2065243A
GB2065243A GB7939705A GB7939705A GB2065243A GB 2065243 A GB2065243 A GB 2065243A GB 7939705 A GB7939705 A GB 7939705A GB 7939705 A GB7939705 A GB 7939705A GB 2065243 A GB2065243 A GB 2065243A
Authority
GB
United Kingdom
Prior art keywords
seal
annular
component
face
face seal
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.)
Withdrawn
Application number
GB7939705A
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.)
WOODVILLE POLYMER ENG
Original Assignee
WOODVILLE POLYMER ENG
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 WOODVILLE POLYMER ENG filed Critical WOODVILLE POLYMER ENG
Priority to GB7939705A priority Critical patent/GB2065243A/en
Priority to DE19803042908 priority patent/DE3042908A1/en
Publication of GB2065243A publication Critical patent/GB2065243A/en
Withdrawn legal-status Critical Current

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
    • F16J15/36—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

Abstract

A rotary face seal assembly comprises a face seal (14) sealed into a recess (15) in an annular seal component (10) which engages a housing so as to form a fluid-tight seal between the housing and the seal assembly. The face seal component (14) is adapted to engage a counterface component mounted on a rotary shaft (not shown). The seal between the annular seal component (10) and the face seal (14) is effected by means of a bead (17) formed on one surface which is compressed into a groove (18) of trapezoidal section formed in the other surface. The face seal component (14) and annular seal (10) are held in close contact by a rigid element (19) bonded to the annular seal component (10). Unintentional displacement of the face seal component (14) is prevented by a lip (20), formed on the recessed portion (11), which extends over the face seal component (14). The face seal assembly may be mounted on the rotary shaft with the counterface component being mounted on the housing. <IMAGE>

Description

SPECIFICATION Improvements to seals between relatively rotatable parts The invention relates to means for providing a liquid-tight seal between two elements which rotate relative to one another, for example, a shaft and a housing through which the shaft extends.
In seal assemblies of this kind, a seal ring or face seal component is carried by one of the relatively rotatable elements and this face seal engages a flat face on a counterface component which is sealed to the other rotatable element. The face seal component is usually carried by a resilient annular seal component which fits tightly to one of the rotatable parts and which is attached to the face-seal component in such a way as to form a liquid-tight seal. In the past this seal between the annular and face seal component has been made by bonding the surfaces of the two parts together but it may be desirable to replace the face seal component if it has become worn or damaged and incapable of providing an efficient seal and this cannot be done without replacing the whole unit if the two parts are bonded together.It is the aim of the present invention to provide an improved method of sealing together the annular and face seal components.
In accordance with the invention there is provided a rotary face seal assembly for providing a seal between a shaft and a housing, or other parts rotatable relative to one another, comprising an annular seal component composed of a resilient material, for engaging a housing or other part, a face seal component sealed to the annular seal and adapted to press against a counterface component provided on the shaft or other part; the face seal component being retained in a recess in the annular seal component, one of the surfaces at the interface between the annular and face seal components having formed on it a bead which seats in a groove formed in the other surface at the interface in such a way that a fluid-tight seal is formed between the annular and face seal components.
The assembly preferably has a rigid annular element bonded to the resilient annular seal component in the vicinity of the face seal component, this rigid element holding the resilient recessed portion of the annular seal component in close contact with the surface of the face seal component. For example, the rigid element may have an angled cross section and embraces an inwardly directed shoulder provided by the recessed portion of the annular seal.
The assembly is preferably such that the recessed portion of the annular seal is formed, e.g.
moulded, with a lip which extends over a surface of the face seal component.
The bead formed on one of the surfaces at the interface between the annular and face seal components may be semi-circular in crosssection, while the corresponding groove may be of trapezoidal cross-section and of such dimensions that the bead may have to be compressed slightly in order for it to be seated in the groove.
The assembly will usually comprise a resilient means, such as a helical spring, which acts so as to urge the annular and face seal components away from each other in an axial direction.
One embodiment of such a seal assembly will now be described in detail with reference to the drawing which is a half section through the seal assembly.
The assembly comprises an annular seal component 10 composed of a resilient material and consisting of two end portions 11 and 12 separated by a flexible bellows or diaphragm 13.
The annular seal component is fitted by forcing the portion 12 into a recess in a machine housing (not shown), the dimensions of the annular seal portion 12 being such that it fits tightly into the recess and forms a fluid-tight seal between the housing and the seal assembly. A face seal component 14 is located in a recess 1 5 in the portion 11 of the annular seal, this face seal component 14 having a flat surface 1 6 which engages a counterface component (not shown) provided on the rotating shaft. The inner face of the recess 1 5 has formed on it a bead 1 7 of semi-circular cross-section and this bead 1 7 seats in a groove 1 8 formed in the corresponding surface of the face seal component 14.This groove 1 8 has a trapezoidal cross-section and has dimensions such that, in order to bring the surfaces of the annular seal portion 11 and face seal component 14 into contact with one another, the bead 1 7 must be slightly compressed as it is forced into the groove 18. The bead 17 is therefore in very close contact with the walls of the groove 1 8 and this close contact forms an effective fluid-tight seal between the annular 10 and face seal 14 components.
In order to ensure that proper contact is maintained between the annular seal portion 11 and the face seal component 14, a rigid element 19 is bonded to the cylindrical inner face and the annular radial face of the annular seal portion 11.
This rigid element 19 prevents the relatively thin and flexible walls of the recess 1 5 from bowing outward and creating gaps between the annular seal portion 11 and the face seal component 14.
The recessed portion 11 is also moulded so as to form a lip 20 which extends over a tapered surface 21 of the face seal component 14, thus preventing inadvertent displacement of the face seal component 14 during handling. In order to fit the face seal component 14, the resilient lip 20 is distorted radially outward allowing the face seal component 14 to be pressed into the recess 1 5.
The resilience of the material causes the lip 20 to return to its unstressed moulded shape, preventing unintentional removal of the face seal component 14.
In order to provide an efficient fluid-tight seal, the face seal component 14 must be kept in close contact with the counterface component (not shown). Moreover, a certain amount of axial movement of the components relative to one another due to wear is inevitable. It is therefore necessary to include in the assembly a means for urging the face seal component 14 and counterface component into sealing contact with each other at all times, relative axial motion being permitted by the flexible bellows 13. In this embodiment a compressed helical spring 22 is mounted between the recessed portion 11 of the annular seal component 10 and its other portion 12. The spring 22 bears at one end against the annular surface of the rigid element 19 and at the other, against a second rigid element 23 which is located inside the annular seal portion 12. This has the effect of distributing the pressure exerted by the spring 22 equally around the circumference of the portions 11 and 12 and avoids the possibility of the resilient material of the annular seal component 10 being damaged by the ends of the spring 22.
This is not the only possible embodiment of the assembly; the counterface component could equally well be mounted on the housing and the face seal component 14 on the shaft. Also, the bead 17 could be moulded onto the face seal component 14 and the groove 18 formed in the annular seal portion 1 but space usually dictates the arrangement described in detail above.

Claims (7)

1. A rotary face seal assembly for providing a seal between a shaft and a housing, or other parts rotatable relative to one another, comprising an annular seal component, composed of a resilient material, for engaging a housing or other part, a face seal component sealed to the annular seal component and adapted to press against a counterface component provided on the shaft or other rotatable part; the face seal component being retained in a recess in the annular seal, one of the surfaces at the interface between the annular and face seals having formed on it a bead which seats in a groove, formed in the other surface at the interface, in such a way that a fluidtight seal is formed between the annular and face seal components.
2. A seal assembly as claimed in claim 1 in which a rigid annular element is bonded to the annular seal in the vicinity of the face seal, the rigid element holding the resilient recessed portion of the annular seal component in close contact with the surface of the face seal component.
3. A seal assembly as claimed in claim 1 or 2 in which the recessed portion of the annular seal component is formed with a lip which extends over a surface of the face seal component.
4. A seal assembly as claimed in any of the preceding claims in which the bead formed on one of the surfaces at the interface between annular and face seals, is semicircular in cross-section.
5. A seal assembly as claimed in any of the preceding claims in which the groove at the interface between the annular and face seals is of trapezoidal cross-section and of such dimensions that the bead must be compressed slightly in order for it to be seated in the groove.
6. A seal assembly as claimed in claim 2 in which the rigid annular element has an angled cross-section and embraces an inwardly directed shoulder provided by the recessed portion of the annular seal.
7. A seal substantially as described with reference to the drawing.
GB7939705A 1979-11-16 1979-11-16 Improvements to seals between relatively rotatable parts Withdrawn GB2065243A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB7939705A GB2065243A (en) 1979-11-16 1979-11-16 Improvements to seals between relatively rotatable parts
DE19803042908 DE3042908A1 (en) 1979-11-16 1980-11-14 GASKET BETWEEN COMPONENT ROTATING COMPONENTS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7939705A GB2065243A (en) 1979-11-16 1979-11-16 Improvements to seals between relatively rotatable parts

Publications (1)

Publication Number Publication Date
GB2065243A true GB2065243A (en) 1981-06-24

Family

ID=10509244

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7939705A Withdrawn GB2065243A (en) 1979-11-16 1979-11-16 Improvements to seals between relatively rotatable parts

Country Status (2)

Country Link
DE (1) DE3042908A1 (en)
GB (1) GB2065243A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4841183A (en) * 1986-10-27 1989-06-20 Emerson Electric Co. Dynamoelectric machine construction and method
US5013051A (en) * 1985-12-20 1991-05-07 Eg&G Sealol, Inc. Single component seal
US5340121A (en) * 1992-10-15 1994-08-23 Furon Company Face seal with integral fluorocarbon polymer bellows
US5758880A (en) * 1996-08-28 1998-06-02 Freudenberg-Nok General Partnership Self piloting seal head assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3138608C2 (en) * 1981-09-29 1983-07-14 Kaco Gmbh + Co, 7100 Heilbronn Mechanical seal

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5013051A (en) * 1985-12-20 1991-05-07 Eg&G Sealol, Inc. Single component seal
US4841183A (en) * 1986-10-27 1989-06-20 Emerson Electric Co. Dynamoelectric machine construction and method
US5340121A (en) * 1992-10-15 1994-08-23 Furon Company Face seal with integral fluorocarbon polymer bellows
US5758880A (en) * 1996-08-28 1998-06-02 Freudenberg-Nok General Partnership Self piloting seal head assembly

Also Published As

Publication number Publication date
DE3042908A1 (en) 1981-05-27

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)