GB1571342A - Shaft sealing arrangement - Google Patents

Shaft sealing arrangement Download PDF

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Publication number
GB1571342A
GB1571342A GB7124/77A GB712477A GB1571342A GB 1571342 A GB1571342 A GB 1571342A GB 7124/77 A GB7124/77 A GB 7124/77A GB 712477 A GB712477 A GB 712477A GB 1571342 A GB1571342 A GB 1571342A
Authority
GB
United Kingdom
Prior art keywords
sealing
housing
sealing element
sleeve
annular
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.)
Expired
Application number
GB7124/77A
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.)
Forsheda Gummifabrik AB
Original Assignee
Forsheda Gummifabrik AB
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
Priority claimed from SE7601750A external-priority patent/SE405161B/en
Priority to FR7704455A priority Critical patent/FR2341795A1/en
Application filed by Forsheda Gummifabrik AB filed Critical Forsheda Gummifabrik AB
Priority to GB7124/77A priority patent/GB1571342A/en
Priority to AU22568/77A priority patent/AU513823B2/en
Priority claimed from US05/772,866 external-priority patent/US4153259A/en
Priority to DE2709243A priority patent/DE2709243C2/en
Publication of GB1571342A publication Critical patent/GB1571342A/en
Expired 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
    • F16J15/162—Special parts or details relating to lubrication or cooling of the sealing itself
    • 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
    • F16J15/40—Sealings between relatively-moving surfaces by means of fluid
    • 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
    • F16J15/54—Other sealings for rotating shafts

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

Description

(54) A SHAFT SEALING ARRANGEMENT (71) We, FORSHEDA GUMMIFABRIK AB, a Swedish company, of S-330 12 Forsheda, Sweden, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: - The present invention relates to a device for sealing an annular space formed between an opening provided in a member, e.g. in a wall, and rotary shaft extending through said opening.
The Swedish Patent Specification No.
356 112 describes a sealing device intended for complicated sealing cases, such as for sealing in polluted atmosphere containing strongly abrasive particles and for sealing shaft passages wherein the difference of the pressures at each side of the wall through which the shaft extends is considerable. Said sealing device comprises a sealing element consisting of a sleeve enclosing the shaft and consisting of an elastic material, preferably rubber, said sleeve sealing engaging the wall through which the shaft extends.The shaft is formed with one or more channels for supplying pressure fluid to the contact surfaces between the sleeve and the shaft, said contact surfaces being supplied with a fluid of such pressure that the sleeve moves away from contact with the shaft for forming a clearance space between sleeve and shaft when the shaft is rotated, the supplied pressure fluid escaping through the clearance space thus formed to the spaces at each side of the sleeve.
As mentioned above, said sealing device is intended for complicated sealing cases, and the device has an extremely good function. However, it is one drawback that it might be complicated and require a laborious work to apply the sealing device in constructions already present. Thus, it is necessary to provide in the construction channels for supplying pressure fluid, and it can also present considerable problems to prevent abrasive particles and dirt from entering into the space between the shaft of the construction and the sealing element of the sealing device when mounting the sealing device in the polluted atmopshere which is usually present where the sealing device shall be used.
The object of the present invention is to provide a sealing device which obviates the above drawbacks.
In accordance with the invention there is provided a sealing device adapted to be readily mounted as a unit on a rotary shaft and intended for use with a rotary shaft extending through an opening provided in a member, the sealing device effecting a seal between said shaft and said member, said sealing device comprising:: (a) a sleeve of uniform internal diameter to be mounted on the shaft by a simple pushing action and to effect a seal with the shaft, (b) an annular sealing element of elasto meric material surrounding said sleeve and resiliently engaging said sleeve to effect a seal therewith, (c) a housing having a central opening and an annular chamber surround ing said opening, said central open ing receiving said sleeve and said annular chamber receiving said an nular sealing element, said annular sealing element making sealing en gagement with side walls of said annular chamber, and said housing being adapted to be connected to said member so as to make sealing engagement with a surface portion of said member surrounding said open ing provided in the member, and (d) fluid pressure connection means mounted on said housing and fluid pressure passage means provided in said housing and in said annular sealing element whereby pressurized fluid can be supplied between the interengaging surfaces of said an nular sealing element and said sleeve to separate said surfaces and form a clearance space through which pressurized fluid flows during rota tion of the shaft.
Thus, the sealing device according to the invention constitutes a unit which in a simple manner can be included in a construction already present. When the sealing device according to the invention shall seal an opening in a wall, through which opening there extends the shaft, it is only necessary tightly to fasten the housing against the wall, the housing having before that been pushed onto the shaft by pushing the sleeve over said shaft. Even if the mounting of the sealing device takes place in a very polluted atmosphere, no pollution of the sensitive parts of the sealing device can take place as the sealing element is completely enclosed by the housing and the sleeve during the mounting.Furthermore, the mounting is very easy to provide as there in only required a fastening of the housing to a wall and connection of a hose for pressure fluid to the housing which is provided with fittings for making the connection easy.
An embodiment of the invention is hereinafter described, by way of example, with reference to the accompanying drawing which is a partial sectional view of a sealing device according to the invention.
The sealing device according to the embodiment of the invention shown in the drawing is adapted for sealing an annular space between a surface forming an opening 2 in a wall 4 and a shaft 6 extending through said opening. The sealing device comprises a housing consisting of two parts 8 and 10. The housing is of annular shape defining a central opening 12b and is formed with an annular central chamber 12a surrounding the opening 12b. The chamber 12a is formed with a peripheral groove 14 into which there extends a channel 16 provided in the portion 8 of the housing. At its opposite end in relation to the chamber 12a, the channel 16 is provided with a connection fitting 18 screwed into the portion 8 of the housing.In the chamber 12a there is provided an annular sealing element 20 of elastomeric material having a central outwardly extending flange 22 extending into the groove 14 of the chamber 12a. The sealing element 20 is provided at its side surfaces with annular projections 23 sealingly engaging the side walls of the chambers 12a. The sealing element 20 is provided with at least one channel 24 extending radially through the sealing element for connecting the groove 14 to a shallow annular cavity 25 provided at the inner surface of the sealing element.
A sleeve 26 is centrally positioned in the housing 8, 10, and the sealing element 20 is positioned around this sleeve with a certain pretensioning so as to grip the sleeve. Each clearance space between the portion 8 or 10 of the housing at one side and the sleeve 26 at the other side is at one side of the sealing element 20 sealed by means of a sealing ring 28 and at the other side of the sealing element 20 sealed by means of a sealing ring 30 and an annular washer 32. The sealing ring 28 is tensioned on to the sleeve 26 and is provided with a lip contacting the side surface of the portion 8 of the housing. A lip of the sealing ring 30 contacts the washer 32 retained in the portion 10 of the housing.The space 34 in which the sealing ring 30 is positioned in the portion 10 of the housing is connected with the chamber 12a of the housing by the fact that a surface of the portion 10 defining a side surface of the space 34 adjacent the sealing ring 30 is provided with one or more channels 36.
The housing 8, 10 including the sealing element 20, the sleeve 26 and the sealing arrangements 28, 30 and 32 between the sleeve and the housing constitute a sealing unit which in a simple manner can be connected with the wall 4 and the shaft 6 extending through said wall in order to seal the annular space. Thus, the sealing unit is pushed onto the shaft 6 with the sleeve 26 positioned around the shaft 6 to a position wherein the portion 8 of the housing engages the wall 4 around the opening 2.
The housing 8, 10 is sealingly connected with the wall 4 by means of bolts 38 and nuts 40. The fitting 18 is connected with a pressure fluid source, for example water under pressure. Concurrently with the starting of the rotation of the shaft 6 the sealing device is supplied with pressure fluid through the fitting 18, the channel 16 and the channel 24 in the sealing element 20. Thus, the surface between the sealing element 20 and the sleeve 26 is supplied with a pressure fluid which causes the sealing element 20 at the surface contacting the sleeve 26 to lift a short distance therefrom so that there is provided a small clearance space between the sealing element 20 and the sleeve 26. The pressure of the pressure fluid thus supplied is greater than the pressure at each side of the sealing device so that the pressure fluid will escape from both sides of the sealing element 20 through the clearance space thus formed.
At the left side of the sealing element the pressure fluid is allowed directly to escape to the space to the left of the wall 4 by the fact that the lip of the sealing ring 28 is lifted out of contact with the portion 8 of the housing by the pressure fluid. In this case the construction is of such kind that the supply of pressure fluid to said space does not have any harmful influence on the construction. The pressure fluid escaping to the right according to the drawing from the sealing element 20 arrives at the space 34 through the channels 36. Thespace 34 is sealed in the direction of the space positioned to the right of the wall 4 and the sealing device by the fact that the lip of the sealing ring 30 is pressed against the washer 32 by the pressure of the chamber 34.The chamber 34 is provided with a draining channel (not shown), extending radially outwards through the portion 10 of the housing from the space 34 to a connection fitting 42 to which a hose can be connected for draining the pressure fluid away in the desired way.
As shown in the drawing, the portions 8 and 10 of the housing are provided with two further connection fittings 44 connected wtih one end of each of two radially extending channels (not shown) in the housing, said channels opening into the chamber 12a at the outer surface of the sealing element 20 at each side of the flange 22 of the sealing element. The channels connected with the fittings 44 can be supplied with a pressure fluid acting on the outer surface of the sealing element.
Thus, such pressure fluid acts for pressing the sealing element 20 against the sleeve 26. This provides for a further possibility of controlling the position of the sealing element 20 in relation to the sleeve 26.
With regard to the manufacturing as well as with regard to the function it is advantageous to manufacture the housing 8, 10 as well as the sleeve 26 from a plastics material, preferably polyethylene.
It is preferred to manufacture the housing 8, 10 from two portions, as is shown in the drawing, said portions being sealingly connected with each other.
It appears from the above description that it is by means of a sealing device according to the invention extremely easy to provide sealing of an annular opening between two machine elements. Especially when the mounting is to take place in polluted atmosphere the sealing device according to the invention offers great advantages.
The sealing element 20 of elastomeric material is completely enclosed by the housing 8, 10 and no dirt can come into the space between the sealing element 20 and the opposite surface together with which the sealing element shall cooperate.
In the previously known mounting of sealing element of the kind described above, the sealing element has cooperated directly with the shaft which in polluted atmosphere has caused considerably difficulties to get rid of dirt particles from the contact surface.
The invention can be modified within the scope of the following claims.
WHAT WE CLAIM IS: - 1. A sealing device adapted to be readily mounted as a unit on a rotary shaft and intended for use with a rotary shaft extending through an opening provided in a member, the sealing device effecting a seal between said shaft and said member, said sealing device comprising:: (a) a sleeve of uniform internal diameter to be mounted on the shaft by a simple pushing action and to effect a seal with the shaft, (b) an annular sealing element of elasto meric material surrounding said sleeve and resiliently engaging said sleeve to effect a seal therewith, (c) a housing having a central opening and an annular chamber surrounding said opening, said central opening receiving said sleeve and said annular chamber receiving said annular seal ing element, said annular sealing element making sealing engagement with side walls of said annular cham ber, and said housing being adapted to be connected to said member so as to make sealing engagement with a surface portion of said member surrounding said opening provided in the member, and (d) fluid pressure connection means mounted on said housing and fluid pressure passage means provided in said housing and in said annular seal ing element whereby pressurized fluid can be supplied between the inter engaging surfaces of said annular sealing element and said sleeve to separate said surfaces and form a clearance space through which pres surized fluid flows during rotation of the shaft.
2. A sealing device, according to Claim 1, in which sealing rings are provided adjacent opposite axial ends of the annular sealing element to provide for sealing between the housing and the sleeve.
3. A sealing device, according to Claim
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. to the space to the left of the wall 4 by the fact that the lip of the sealing ring 28 is lifted out of contact with the portion 8 of the housing by the pressure fluid. In this case the construction is of such kind that the supply of pressure fluid to said space does not have any harmful influence on the construction. The pressure fluid escaping to the right according to the drawing from the sealing element 20 arrives at the space 34 through the channels 36. Thespace 34 is sealed in the direction of the space positioned to the right of the wall 4 and the sealing device by the fact that the lip of the sealing ring 30 is pressed against the washer 32 by the pressure of the chamber 34.The chamber 34 is provided with a draining channel (not shown), extending radially outwards through the portion 10 of the housing from the space 34 to a connection fitting 42 to which a hose can be connected for draining the pressure fluid away in the desired way. As shown in the drawing, the portions 8 and 10 of the housing are provided with two further connection fittings 44 connected wtih one end of each of two radially extending channels (not shown) in the housing, said channels opening into the chamber 12a at the outer surface of the sealing element 20 at each side of the flange 22 of the sealing element. The channels connected with the fittings 44 can be supplied with a pressure fluid acting on the outer surface of the sealing element. Thus, such pressure fluid acts for pressing the sealing element 20 against the sleeve 26. This provides for a further possibility of controlling the position of the sealing element 20 in relation to the sleeve 26. With regard to the manufacturing as well as with regard to the function it is advantageous to manufacture the housing 8, 10 as well as the sleeve 26 from a plastics material, preferably polyethylene. It is preferred to manufacture the housing 8, 10 from two portions, as is shown in the drawing, said portions being sealingly connected with each other. It appears from the above description that it is by means of a sealing device according to the invention extremely easy to provide sealing of an annular opening between two machine elements. Especially when the mounting is to take place in polluted atmosphere the sealing device according to the invention offers great advantages. The sealing element 20 of elastomeric material is completely enclosed by the housing 8, 10 and no dirt can come into the space between the sealing element 20 and the opposite surface together with which the sealing element shall cooperate. In the previously known mounting of sealing element of the kind described above, the sealing element has cooperated directly with the shaft which in polluted atmosphere has caused considerably difficulties to get rid of dirt particles from the contact surface. The invention can be modified within the scope of the following claims. WHAT WE CLAIM IS: -
1. A sealing device adapted to be readily mounted as a unit on a rotary shaft and intended for use with a rotary shaft extending through an opening provided in a member, the sealing device effecting a seal between said shaft and said member, said sealing device comprising:: (a) a sleeve of uniform internal diameter to be mounted on the shaft by a simple pushing action and to effect a seal with the shaft, (b) an annular sealing element of elasto meric material surrounding said sleeve and resiliently engaging said sleeve to effect a seal therewith, (c) a housing having a central opening and an annular chamber surrounding said opening, said central opening receiving said sleeve and said annular chamber receiving said annular seal ing element, said annular sealing element making sealing engagement with side walls of said annular cham ber, and said housing being adapted to be connected to said member so as to make sealing engagement with a surface portion of said member surrounding said opening provided in the member, and (d) fluid pressure connection means mounted on said housing and fluid pressure passage means provided in said housing and in said annular seal ing element whereby pressurized fluid can be supplied between the inter engaging surfaces of said annular sealing element and said sleeve to separate said surfaces and form a clearance space through which pres surized fluid flows during rotation of the shaft.
2. A sealing device, according to Claim 1, in which sealing rings are provided adjacent opposite axial ends of the annular sealing element to provide for sealing between the housing and the sleeve.
3. A sealing device, according to Claim
1 or Claim 2, in which the housing is provided with fluid pressure passage means for the discharge of the pressurised fluid.
4. A sealing device, according to any preceding claim, in which the housing and the sleeve consist of plastics material.
5. A sealing device, according to Claim 4, in which the plastics material is polyethylene.
6. A sealing device, adapted to be readily mounted as a unit on a rotary shaft, substantially as hereinbefore described with reference to, and as illustrated in, the accompanying drawing.
GB7124/77A 1976-02-17 1977-02-21 Shaft sealing arrangement Expired GB1571342A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR7704455A FR2341795A1 (en) 1976-02-17 1977-02-16 Enclosed unit for sealing an axle through a partition - is suitable for mounting in a dusty atmosphere around an existing machine (SW 12.9.77)
GB7124/77A GB1571342A (en) 1976-02-17 1977-02-21 Shaft sealing arrangement
AU22568/77A AU513823B2 (en) 1976-02-17 1977-02-23 Shaft seal
DE2709243A DE2709243C2 (en) 1976-02-17 1977-03-03 Method and device for sealing a shaft

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE7601750A SE405161B (en) 1976-02-17 1976-02-17 DEVICE FOR SEALING AN RING-OPENED BETWEEN TWO MACHINE ELEMENTS
GB7124/77A GB1571342A (en) 1976-02-17 1977-02-21 Shaft sealing arrangement
US05/772,866 US4153259A (en) 1976-02-17 1977-02-28 Shaft sealing arrangement

Publications (1)

Publication Number Publication Date
GB1571342A true GB1571342A (en) 1980-07-16

Family

ID=29407308

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7124/77A Expired GB1571342A (en) 1976-02-17 1977-02-21 Shaft sealing arrangement

Country Status (1)

Country Link
GB (1) GB1571342A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2483539A1 (en) * 1980-05-27 1981-12-04 Reliance Electric Co
GB2118641A (en) * 1982-04-22 1983-11-02 Crane Packing Limited Company Seal assembly
GB2140880A (en) * 1983-04-21 1984-12-05 Mitsubishi Heavy Ind Ltd Shaft sealer
GB2252597A (en) * 1991-02-06 1992-08-12 Cocksedge Eng Ltd Seals for roller assemblies
EP0511608A1 (en) * 1991-04-27 1992-11-04 VEMAG Maschinenbau GmbH Feeder unit in a hopper, especially for a sausage stuffing machine
GB2333331A (en) * 1997-12-31 1999-07-21 Lewis Patrick A marine propeller shaft seal

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2483539A1 (en) * 1980-05-27 1981-12-04 Reliance Electric Co
NL8102396A (en) * 1980-05-27 1981-12-16 Reliance Electric Co ARMY SEAL.
GB2118641A (en) * 1982-04-22 1983-11-02 Crane Packing Limited Company Seal assembly
GB2140880A (en) * 1983-04-21 1984-12-05 Mitsubishi Heavy Ind Ltd Shaft sealer
GB2252597A (en) * 1991-02-06 1992-08-12 Cocksedge Eng Ltd Seals for roller assemblies
GB2252597B (en) * 1991-02-06 1994-08-10 Cocksedge Eng Ltd Improvements in roller assemblies
EP0511608A1 (en) * 1991-04-27 1992-11-04 VEMAG Maschinenbau GmbH Feeder unit in a hopper, especially for a sausage stuffing machine
US5352150A (en) * 1991-04-27 1994-10-04 Klaus Markwardt Feeding device installed in a loading bin, for special use in a sausage filling machine
GB2333331A (en) * 1997-12-31 1999-07-21 Lewis Patrick A marine propeller shaft seal

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee