GB2126289A - Fluid seal - Google Patents

Fluid seal Download PDF

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Publication number
GB2126289A
GB2126289A GB08224092A GB8224092A GB2126289A GB 2126289 A GB2126289 A GB 2126289A GB 08224092 A GB08224092 A GB 08224092A GB 8224092 A GB8224092 A GB 8224092A GB 2126289 A GB2126289 A GB 2126289A
Authority
GB
United Kingdom
Prior art keywords
seal
shaft
seals
lip
face
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
GB08224092A
Other versions
GB2126289B (en
Inventor
John Eric Brown
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.)
WEST AND SONS
Original Assignee
WEST AND SONS
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 WEST AND SONS filed Critical WEST AND SONS
Priority to GB08224092A priority Critical patent/GB2126289B/en
Publication of GB2126289A publication Critical patent/GB2126289A/en
Application granted granted Critical
Publication of GB2126289B publication Critical patent/GB2126289B/en
Expired legal-status Critical Current

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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
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3208—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip provided with tension elements, e.g. elastic rings
    • 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
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/322—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip supported in a direction perpendicular to the surfaces
    • 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
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/324—Arrangements for lubrication or cooling of the sealing itself

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Sealing Devices (AREA)

Abstract

A shaft seal has an annular body portion 11 from which projects in an axial direction an annular lip portion 12, the lip portion 12 at one axial end being connected to the body and at its opposite axial end terminating in an annular surface for engaging a shaft, the annular surface including a first axially extending portion 17 for sealing against said shaft and a second axially extending portion 18 for engaging the shaft to provide support for the first portion. The second portion 18 includes a series of slots 70, each slot communicating with a bore to allow flow of fluid on both sides of the lip portion to provide cooling for the lip portion. <IMAGE>

Description

SPECIFICATION Fluid seal The present invention relates to seals, in particular to a fluid seal intended for sealing high pressure fluids.
Various aspects of the present invention are hereinafter described with reference to the accompanying drawings, in which: Figure lisa perspective view of a seal according to the present invention.
Figure 2 is an axial section ofthe seal shown in Figure 1 taken along line ll-ll.
Figure 3 is a part axial section through the seal of Figure 1 shown in situ.
The seal according to the present invention is generally shown at 10, and includes an annular body 11 from which depends an annular sealing lip 12. The body 11 and lip 12 are integrally connected and are formed in one piece from a suitable plastics material by machining or moulding.
Asuitable plastics material is one which is rigid but has sufficient flexibility forthe requirements of the seal. For instance, plastics materials such as polyamides are suitable.
The lip 12 in section, as shown in Figure 2, widens progressively from its connection with the body 11 toward its terminal end. The terminal end of the seal 10 includes an annular seal face 15which, in use, engages the shaft 20 (Figure 3)to be sealed.
The seal face 15 includestwo discrete portions which perform different functions Viz, a first portion 17 which is of an axial length sufficientto provide a seal to prevent seapage offluid along the shaft to be sealed and a second portion 18 which is of an axial length sufficient to prevent deformation ofthe first portion when the seal 10 is in use.
In use the seal 10 is located so thatthe outerface 1 2a ofthe lip 11 sealingly abuts an annular seat 40 formed in a housing 41 and the seal face 15 abuts the shaft 20.
The body 12 of the seal is placed under an axial loading so thatthe face 12a is urged into contact with seat 40 and face 15 is urged into contact with the shaft.
In the arrangement shown in Figure 3, a pair of seals 10 are located in a chamber 50 and arranged in a back to backfashion with a spacer ring 54 located therebe tween.The chamber 50 includes a pair of end walls 51, 52 respectively againstwhich the outer face 1 2a of a respective seal 10 sealing ly abuts. Accordingly seals 10 serve to seal against loss offluid between shaft 20 and walls 51,52 ofthe chamber. In use pressurised fluid, for instance water is supplied to chamber 50 via duct 56 and the pressurised water exits from chamber 50 to pass along duct 56' formed in the shaft 20. Such an arrangement is envisaged for use in mining wherein shaft 20 carries a mineral cutting drum which contains waterjets which serve to assist winning of the mineral.Accordingly the water is supplied at a very high pressure, usually in the region of 10,000 p.s.i. to 20,000 p.s.i.
A series of compression springs 60 are spaced circumferentially about each seal and extend between a seal 10 and the spacer ring 54. In use, when the seals 10 and spacer ring 54, with springs 60 located therebetween, are fitted into the chamber 50 their combined axial length is greaterthan the axial spacing between walls 51,52. Accordingly after fitting, the springs 60 are compressed and so place each seal 10 under an axial loading and so maintains faces 12a and 15 in sealing abutment with the chamber walls 51,52 and shaft 20 respectively.
As seen in Figure 2 a series of slots 70 are provided in lip 11 which divide second portion 18 into discrete circumferentially extending portions. Bores 71 extending through the lip 12 and are provided in orderto providea passagewayforfluidinchamber50for equalising fluid pressure on both sides of the lip 12.
The slots 70 serve to increase the flexibility ofthe lip 12 so that when the seal 10 is placed under axial compression the seal portion 17 can seal correctly and abut against the shaft 20 with sufficient pressure.
Additionaily the slots 70 serve to assist in cooling of the seal 10 in use due to passage of fluid through the slots 70 and bores 71. This is advantageous as it serves to discourage the temperature of the lip 12 rising too high which could cause excessive extrusion ofthe plastics material from which the seal is made.
The seals 10 shown in Figure3 may be located within chamber 50 so as to be stationary relative thereto or be allowed to rotate relative thereto. In the first situation, keyways may be formed in the outer periphery of each seal 10, suitable keys being located therein so as to restrain relative rotation between each seal 10 and the chamber 50. In the second situation, dowels (not shown) are provided which extend axially between the seals 10 as to secure them together for rotation in unison. Due to the friction between face 15 and shaft 20 the seals 10 will be encouraged to rotate.
Resistance to rotation of seals 10 is created by friction between each face 1 2a and seat 40 and between the outer periphery of the body of the seal 10 and the chamberwalls 53. By varying the axial length of contact between the outer periphery of seal 10 and wall 53 it is possible to vary the amount of resistance to rotation of the seals and thereby vary the speed of rotation ofthe seals when in use.
Accordingly, since seals 10 are permitted to rotate the amount of wear of seal face 15 is reduced and seal face 12a is exposed to a wear condition thereby creating a distribution of wear between faces 15 and 12a.
CLAIMS (filed on 16.8.83) 1. Ashaftseal having an annularbody portion from which projects in an axial direction an annular lip portion, the lip portion at one axial end being connected to the body and at its opposite axial end terminating in an annular surface for engaging the shaft, the annular surface including a first axially extending portion for sealing against said shaft and a second axially extending portion for engaging the shaft to provide supportforthe first portion.
2. A shaft seal according to Claim 1, wherein the second portion is divided into discrete circum ferentiallyextending portions.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Fluid seal The present invention relates to seals, in particular to a fluid seal intended for sealing high pressure fluids. Various aspects of the present invention are hereinafter described with reference to the accompanying drawings, in which: Figure lisa perspective view of a seal according to the present invention. Figure 2 is an axial section ofthe seal shown in Figure 1 taken along line ll-ll. Figure 3 is a part axial section through the seal of Figure 1 shown in situ. The seal according to the present invention is generally shown at 10, and includes an annular body 11 from which depends an annular sealing lip 12. The body 11 and lip 12 are integrally connected and are formed in one piece from a suitable plastics material by machining or moulding. Asuitable plastics material is one which is rigid but has sufficient flexibility forthe requirements of the seal. For instance, plastics materials such as polyamides are suitable. The lip 12 in section, as shown in Figure 2, widens progressively from its connection with the body 11 toward its terminal end. The terminal end of the seal 10 includes an annular seal face 15which, in use, engages the shaft 20 (Figure 3)to be sealed. The seal face 15 includestwo discrete portions which perform different functions Viz, a first portion 17 which is of an axial length sufficientto provide a seal to prevent seapage offluid along the shaft to be sealed and a second portion 18 which is of an axial length sufficient to prevent deformation ofthe first portion when the seal 10 is in use. In use the seal 10 is located so thatthe outerface 1 2a ofthe lip 11 sealingly abuts an annular seat 40 formed in a housing 41 and the seal face 15 abuts the shaft 20. The body 12 of the seal is placed under an axial loading so thatthe face 12a is urged into contact with seat 40 and face 15 is urged into contact with the shaft. In the arrangement shown in Figure 3, a pair of seals 10 are located in a chamber 50 and arranged in a back to backfashion with a spacer ring 54 located therebe tween.The chamber 50 includes a pair of end walls 51, 52 respectively againstwhich the outer face 1 2a of a respective seal 10 sealing ly abuts. Accordingly seals 10 serve to seal against loss offluid between shaft 20 and walls 51,52 ofthe chamber. In use pressurised fluid, for instance water is supplied to chamber 50 via duct 56 and the pressurised water exits from chamber 50 to pass along duct 56' formed in the shaft 20. Such an arrangement is envisaged for use in mining wherein shaft 20 carries a mineral cutting drum which contains waterjets which serve to assist winning of the mineral.Accordingly the water is supplied at a very high pressure, usually in the region of 10,000 p.s.i. to 20,000 p.s.i. A series of compression springs 60 are spaced circumferentially about each seal and extend between a seal 10 and the spacer ring 54. In use, when the seals 10 and spacer ring 54, with springs 60 located therebetween, are fitted into the chamber 50 their combined axial length is greaterthan the axial spacing between walls 51,52. Accordingly after fitting, the springs 60 are compressed and so place each seal 10 under an axial loading and so maintains faces 12a and 15 in sealing abutment with the chamber walls 51,52 and shaft 20 respectively. As seen in Figure 2 a series of slots 70 are provided in lip 11 which divide second portion 18 into discrete circumferentially extending portions. Bores 71 extending through the lip 12 and are provided in orderto providea passagewayforfluidinchamber50for equalising fluid pressure on both sides of the lip 12. The slots 70 serve to increase the flexibility ofthe lip 12 so that when the seal 10 is placed under axial compression the seal portion 17 can seal correctly and abut against the shaft 20 with sufficient pressure. Additionaily the slots 70 serve to assist in cooling of the seal 10 in use due to passage of fluid through the slots 70 and bores 71. This is advantageous as it serves to discourage the temperature of the lip 12 rising too high which could cause excessive extrusion ofthe plastics material from which the seal is made. The seals 10 shown in Figure3 may be located within chamber 50 so as to be stationary relative thereto or be allowed to rotate relative thereto. In the first situation, keyways may be formed in the outer periphery of each seal 10, suitable keys being located therein so as to restrain relative rotation between each seal 10 and the chamber 50. In the second situation, dowels (not shown) are provided which extend axially between the seals 10 as to secure them together for rotation in unison. Due to the friction between face 15 and shaft 20 the seals 10 will be encouraged to rotate. Resistance to rotation of seals 10 is created by friction between each face 1 2a and seat 40 and between the outer periphery of the body of the seal 10 and the chamberwalls 53. By varying the axial length of contact between the outer periphery of seal 10 and wall 53 it is possible to vary the amount of resistance to rotation of the seals and thereby vary the speed of rotation ofthe seals when in use. Accordingly, since seals 10 are permitted to rotate the amount of wear of seal face 15 is reduced and seal face 12a is exposed to a wear condition thereby creating a distribution of wear between faces 15 and 12a. CLAIMS (filed on 16.8.83)
1. Ashaftseal having an annularbody portion from which projects in an axial direction an annular lip portion, the lip portion at one axial end being connected to the body and at its opposite axial end terminating in an annular surface for engaging the shaft, the annular surface including a first axially extending portion for sealing against said shaft and a second axially extending portion for engaging the shaft to provide supportforthe first portion.
2. A shaft seal according to Claim 1, wherein the second portion is divided into discrete circum ferentiallyextending portions.
3. A shaft seal according to Claim 1 or 2, wherein bores passing through the lip portion are provided at circumferentiallyspaced locations.
4. A shaft seal according to any preceding Claim, wherein the body portion and lip portion are formed integrally from a suitable rigid plastics material.
5. A shaft seal according to Claim 4wherein the plastics material is a polyamide.
6. A shaft seal substantially as described with reference to the accompanying drawings.
7. A shaft seal unit including a pair of shaft seals according to any preceding Claim, the shaftseals being axially spaced from one another and biasing means located between the shaft seals for urging the shaft seals apart.
8. A shaft seal unit substantially as described with reference to Figure 3 of the accompanying drawings.
GB08224092A 1982-08-20 1982-08-20 Fluid seal Expired GB2126289B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08224092A GB2126289B (en) 1982-08-20 1982-08-20 Fluid seal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08224092A GB2126289B (en) 1982-08-20 1982-08-20 Fluid seal

Publications (2)

Publication Number Publication Date
GB2126289A true GB2126289A (en) 1984-03-21
GB2126289B GB2126289B (en) 1986-04-03

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GB08224092A Expired GB2126289B (en) 1982-08-20 1982-08-20 Fluid seal

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2180893A (en) * 1984-08-01 1987-04-08 Festo Kg Segmented annular wiper lip for reciprocating rods
FR2646888A1 (en) * 1989-05-09 1990-11-16 Rexroth Sigma Sealing device for a rotating shaft, particularly for a shaft rotating at high speed
GB2371096A (en) * 1998-05-19 2002-07-17 Simpson Ind Inc A pump seal flushing system for a vehicle fluid pump
GB2404229A (en) * 2003-07-24 2005-01-26 Edgar Padbury Coleman A fluid-tight joint between two relatively rotating parts including a flange component with at least one aperture
WO2016204895A1 (en) * 2015-06-19 2016-12-22 Caterpillar Inc. Mechanical face seal

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1026551A (en) * 1963-01-21 1966-04-20 Johannes Zagorski Improvements in or relating to stuffing boxes for plungers and piston rods of high-pressure engines and the like

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1026551A (en) * 1963-01-21 1966-04-20 Johannes Zagorski Improvements in or relating to stuffing boxes for plungers and piston rods of high-pressure engines and the like

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2180893A (en) * 1984-08-01 1987-04-08 Festo Kg Segmented annular wiper lip for reciprocating rods
FR2646888A1 (en) * 1989-05-09 1990-11-16 Rexroth Sigma Sealing device for a rotating shaft, particularly for a shaft rotating at high speed
GB2371096A (en) * 1998-05-19 2002-07-17 Simpson Ind Inc A pump seal flushing system for a vehicle fluid pump
GB2371096B (en) * 1998-05-19 2002-09-04 Simpson Ind Inc Pump seal flushing system
GB2404229A (en) * 2003-07-24 2005-01-26 Edgar Padbury Coleman A fluid-tight joint between two relatively rotating parts including a flange component with at least one aperture
GB2404229B (en) * 2003-07-24 2007-01-10 Edgar Padbury Coleman Fluid-tight joints between two relatively rotating parts
WO2016204895A1 (en) * 2015-06-19 2016-12-22 Caterpillar Inc. Mechanical face seal
US9951872B2 (en) 2015-06-19 2018-04-24 Caterpillar Inc. Mechanical face seal

Also Published As

Publication number Publication date
GB2126289B (en) 1986-04-03

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19920820