WO2010023120A1 - Douille pour raccord de tubes - Google Patents

Douille pour raccord de tubes Download PDF

Info

Publication number
WO2010023120A1
WO2010023120A1 PCT/EP2009/060567 EP2009060567W WO2010023120A1 WO 2010023120 A1 WO2010023120 A1 WO 2010023120A1 EP 2009060567 W EP2009060567 W EP 2009060567W WO 2010023120 A1 WO2010023120 A1 WO 2010023120A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
socket
gasket
pipe
opening
Prior art date
Application number
PCT/EP2009/060567
Other languages
English (en)
Inventor
Kai Olsen
Anders NYGÅRD
Bjørn BÆVER
Roar Gravningen
Original Assignee
Kongsberg Esco A/S
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 Kongsberg Esco A/S filed Critical Kongsberg Esco A/S
Publication of WO2010023120A1 publication Critical patent/WO2010023120A1/fr

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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L37/00—Couplings of the quick-acting type
    • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
    • F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
    • F16L37/0842—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of a ring which is split into a plurality of component parts which are held in place by means of a resilient ring member
    • 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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L37/00—Couplings of the quick-acting type
    • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
    • F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
    • F16L37/0845—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of retaining members associated with the packing member

Definitions

  • the present invention relates to a socket for a pipe joint and to a pipe joint comprising such a socket.
  • the socket is suitable for joining buried pipes, e.g. in water supply systems.
  • Pipes for water supply systems typically carry water under a high pressure. Furthermore, they are typically laid in the ground without any other retaining structures than the soil itself. Thus, an accurate alignment of the pipes, angularly as well as radially, is difficult to attain. Also, the pipes vary in diameter, both due to different places of manufacture, due to ageing and due to varying water pressure. When laying the pipes, access to the joints often takes place through narrow wells, which substantially limit the freedom to move for the working personnel. When a defective joint has to be replaced, the work often takes place in a hole dug into the ground, which adds the risk of contaminating the joint with sand or soil during working.
  • joints typically require accurate alignment and a dirt-free environment in order to function reliably and maintain their properties over long periods of time, or a large freedom to move for the working personnel, or both.
  • the latter especially applies to joints, which require clamps, nuts or bolts to be tensioned by means of a wrench or another handheld tool.
  • US 5,360,218 discloses a socket joint for pressurized fluid carrying pipes incorporating a radially-compressed gasket locked in position by toothed inserts each having an inclined face which slides on and bears against a similarly inclined face of a support member embedded in an anchoring heel of the gasket.
  • the inserts slide on the support members without undergoing rotation in order to avoid penetration of the insert teeth into the male pipe end and an attendant perforation thereof.
  • a socket for a pipe joint comprising:
  • a housing having an opening formed therein, the opening being adapted to receive an end of a pipe to be joined to the socket,
  • a resilient, annular gasket arranged in an interior part of the housing, and being attached to an inner wall of the housing in a substantially fluid tight manner, the gasket defining an inner rim adapted to abut an outer wall of a pipe being inserted through the opening of the housing, and
  • a generally annular gasket support arranged in an interior part of the housing and in such a manner that it is adapted to support the gasket, at least when the pipe joint is subjected to an internal pressure, the gasket support comprising at least two support members, each being mounted in a pivotally movable manner in the interior part of the housing.
  • the socket of the invention is a female socket in the sense that it is adapted to receive an end of a pipe in the interior part of the housing, the pipe being inserted through the opening of the housing.
  • the term 'housing' should be interpreted to mean a part which is substantially closed. Accordingly, when a pipe has been inserted in the socket via the opening of the housing, the interior part of the housing forms a cavity which is closed and separated from the surroundings. Obviously, the cavity may be part of a larger cavity formed by the connected pipes, valves etc.
  • the housing may advantageously be made from a metal, such as cast iron, brass or steel.
  • the housing may be a single piece. Alternatively, it may comprise two or more separate parts. In this case the housing parts may be connected by releasable means, such as a bayonet coupling, threaded portions or bolts, in order to allow servicing of the pipe joint.
  • the socket comprises a resilient, annular gasket arranged in an interior part of the housing. Accordingly, the annular gasket is arranged inside the closed cavity formed by the housing as described above.
  • the gasket is annular, i.e. it extends entirely along a perimeter of an inner wall of the housing.
  • the annular gasket is resilient. This should be interpreted to mean that it is made from a material and has a thickness which allows it to change its shape, at least to a certain extent.
  • the annular gasket may advantageously be made from a rubber or from a rubber-like plastic material. Accordingly, the annular gasket is capable of adapting its shape in accordance with the shape of a pipe being received in the socket. Thereby a substantially tight fit between the pipe and the annular gasket can be ensured.
  • the annular gasket is attached to an inner wall of the housing in a substantially fluid tight manner.
  • the annular gasket may, e.g., be attached to the inner wall by means of a suitable kind of welding, by means of a suitable glue, by a protruding part of the gasket being inserted into a groove formed in the inner wall of the housing, or in any other suitable manner providing the required fluid tightness.
  • the annular gasket defines an inner rim which is adapted to abut an outer wall of a pipe being inserted through the opening of the housing. This should be interpreted to mean that the inner rim is in contact with the outer wall of the pipe, preferably along the entire perimeter of the outer wall of the pipe. Since the annular gasket is resilient, the outer wall of the pipe may deform and/or slightly move the inner rim of the annular gasket as the pipe is inserted in the socket. It should be noted that the inner rim may contact the outer wall of the pipe only along a thin line.
  • the contact between the annular gasket and the outer wall of the pipe may cover a somewhat larger area, such as a band arranged along the perimeter of the pipe, and the gasket will, in this case, fit tightly around the pipe for a part of the length of the pipe.
  • the inner rim of the annular gasket should be interpreted to be the part of the annular gasket which is in contact with the outer wall of a pipe being inserted in the socket. Accordingly, the extension of the inner rim may depend on the size of the pipe which is inserted.
  • the inner rim preferably has a cross sectional shape which matches, or at least is capable of adapting to, the cross sectional shape of a pipe being inserted through the opening of the housing.
  • the inner rim preferably defines an opening with a substantially circular cross section, in which case it matches a pipe having a substantially circular cross section.
  • the opening defined by the inner rim may advantageously have a cross sectional shape which matches this cross section. Thereby a tight fit between the annular gasket and the pipe can be ensured.
  • the socket comprises a generally annular gasket support which is arranged in an interior part of the housing.
  • the term 'generally annular' should be interpreted to mean that it extends at least substantially along a perimeter of an inner wall of the housing. It may, however, be formed by or comprise several individual parts, which may possibly be arranged spaced apart along the perimeter.
  • the gasket support is arranged in such a manner that it is adapted to support the gasket, at least when the pipe joint is subjected to an internal pressure, i.e. a pressure inside the cavity/pipe.
  • the gasket support is preferably arranged relative to the annular gasket in such a manner that it limits the annular gasket's ability to move and/or change shape, at least in certain directions.
  • the gasket support may be arranged to abut at least a part of the annular gasket, at least when the pipe joint is subjected to an internal pressure. When the pipe joint is not subjected to an internal pressure, the gasket support is not necessarily arranged to support the annular gasket, although this may be the case.
  • the gasket support is preferably made from a relatively stiff material, such as a suitable plastic material or a metal, such as stainless steel.
  • the gasket support ensures that the shape of the annular gasket is not changed in a manner which compromises the fluid tightness of the gasket/wall interface, and that a firm abutment is maintained between the annular gasket and the outer wall of the pipe. Since the gasket support is generally annular, such a tight fit is maintained along the entire perimeter of the outer wall of the pipe, and the risk of leaks is thereby minimised.
  • the gasket support comprises at least two support members, each being mounted in a pivotally movable manner in the interior part of the housing.
  • the support members preferably form the part of the gasket support which is actually supporting, e.g. abutting, the annular gasket.
  • the support members in combination present a support surface towards the annular gasket. Since the support members are pivotally movable they may allow the annular gasket to move to a certain extent, the support members moving along with the annular gasket, while preventing the annular gasket from deforming, at least in areas which are arranged in abutment with the support members. Such movements may allow the annular gasket to adapt to an even wider range of diameters of pipes. Furthermore allow an axial misalignment of the pipe and the socket and to allow tolerance for minor angle shift between the joining pipes.
  • the support members may in combination cover an essentially continuous, annular surface, said essentially continuous, annular surface being arranged to provide support for the annular gasket.
  • annular surface' should be interpreted to mean that the gasket and the gasket support are dimensioned so that any openings occurring in the support surface between the individual support members are small enough to ensure that when the socket is subjected to an internal pressure within the allowable pressure range for the piping system of which the socket will be part, the gasket or part hereof will not protrude through the openings to an extent which could cause a leak or damage the gasket.
  • the support members of the gasket support may be arranged in such a manner that pivotal movements of one or more of the support members causes changes in the area of an opening defined by the inner rim of the gasket.
  • the inner rim is the part of the annular gasket which abuts an outer wall of a pipe being inserted in the socket.
  • the pivotal movements of the support members allow the annular gasket to abut pipes of various sizes in a fluid tight manner. Furthermore allow an axial misalignment of the pipe and the socket or a minor angle shift between the joining pipes.
  • the support members and the gasket may define an annular sloping surface extending from the inner wall of the housing to the inner rim of the gasket in a direction radially inwards of the housing and axially away from the opening of the housing.
  • the inner rim of the annular gasket will tend to move along, due to the tight fit between the annular gasket and the outer wall of the pipe. Due to the direction of the slope of the sloping surface, such a movement of the inner rim will cause the sloping surface to be moved in a direction away from the inner wall of the housing, thereby decreasing the area of the opening defined by the inner rim. As a consequence, the grip between the annular gasket and the pipe tightens, thereby preventing leaks.
  • the gasket may have a substantially conical or a frusto-conical shape, e.g. defining a sloping surface as described above.
  • the apex of the cone may advantageously face in a direction away from the opening of the housing.
  • the gasket support may be arranged adjacent to the gasket between the gasket and the opening of the housing.
  • the gasket and the support members further define a sloping surface as described above, the following advantages can be obtained.
  • the pressurised medium When a pressure is applied to the inside of the socket and the pipe, the pressurised medium will exert a force on the gasket, which is directed partly radially outwards and partly axially towards the opening of the housing, thereby forcing the gasket against the support members, and thus also forcing radially inner ends of these against the outside of the pipe.
  • the support members are preferably fabricated from a material, which is strong enough to withstand the force to an extent where their radially inner ends in the axial direction remain further away from the housing opening than their radially outer ends.
  • the support surface is dimensioned to prevent the gasket from moving beyond the support members.
  • any openings in the support surface occurring between the individual support members are so small that the gasket or parts hereof are prevented from moving through the openings to an extent which could cause a leak or damage the gasket.
  • the support members ensure that the gasket retains a generally conical shape with the apex facing away from the housing opening. This ensures that the pressure inside the pipe will force the radially inner rim of the gasket against the pipe, wherefore the joint between the socket and the pipe is inherently fluid tight in case of an overpressure inside the socket and the pipe.
  • due to the direction of the slope of the sloping surface if the pipe is moved in a reverse direction, e.g.
  • each of the support members may comprise a fixed end which is attached to the inner wall of the housing and a free end arranged opposite to the fixed end, and the free end of a support member may be moved axially when the support member performs pivotal movements.
  • axial movements of a free end of a support member in a direction towards the opening of the housing may cause the area of the opening defined by the inner rim of the gasket to decrease, and axial movements of a free end of a support member in a direction away from the opening of the housing may cause the area of the opening defined by the inner rim of the gasket to increase, at least when the pipe joint is subjected to an internal pressure.
  • the free ends of the support members may be biased in a direction towards the opening of the housing.
  • the support members allow the opening defined by the inner rim of the annular gasket to attain the smallest possible area, since only the outer wall of a pipe inserted in the socket will push the inner rim radially outwards.
  • a very tight fit between the annular gasket and the outer wall of the pipe is ensured.
  • any dirt, which may have gathered on the outside of the pipe will be scraped off by the support members during insertion of the pipe.
  • the bias force may be exerted by the gasket or by other elastic or spring means. Alternatively or additionally, the bias force may originate from elastic properties of the support members themselves or part hereof.
  • the gasket support may comprise an annular part to which the support members are attached by means of an elastic link, the elastic link providing the bias force.
  • the annular part of the gasket support and the support members may be part of a single, integrally moulded elastic part.
  • the surface of the support members facing towards the housing opening may be provided with projections, depressions, adhesive material or the like in order to increase their ability to remove dirt during insertion of the pipe.
  • the free ends of the support members may be provided with teeth and/or a rough surface that engage the inserted pipe and - due to the inclination of the support members - counteract the retraction of the pipe from the socket.
  • Each of the support members may be pivotally movable independently of the other support members. Thereby varying pipe diameters as well as misalignment between the socket and the pipe may easily be adapted to. Furthermore, no other assembling procedures are required than the axial insertion of a male end of the pipe into the socket.
  • the gasket may comprise an annular sealing projection adapted to engage with a part of the inner wall of the housing in order to establish a substantially fluid tight sealing between the inner wall of the housing and the gasket.
  • the annular sealing projection may, e.g., be in the form of an O-ring like projection which can be received in a matching groove formed in the inner wall of the housing, thereby providing the required fluid tightness between the annular gasket and the inner wall of the housing.
  • the housing may comprise two housing parts. In this case the sealing projection may advantageously be adapted to be positioned between the two housing parts
  • the socket may further comprise one or more retaining members arranged in an interior part of the housing, each of the retaining members being adapted to perform rotating movements about a rotation axis which is arranged tangentially with respect to a longitudinal axis defined by the housing.
  • the rotating axes of the retaining members are preferably arranged substantially tangentially to the inner wall of the housing and perpendicularly to the longitudinal axis defined by the housing.
  • Each retaining member may comprise a contact face adapted to engage a pipe being inserted via the opening of the housing, thereby establishing a zone of contact, and the rotation axes of the retaining members may be arranged between the zone of contact and the opening of the housing in an axial direction.
  • the retaining members are adapted to retain the pipe, i.e. the retaining members prevent the pipe from leaving the socket.
  • the contact face may be in the form of an edge, in which case the zone of contact is a thin line, or the contact face may be in the form of a surface, in which case the zone of contact covers an area of the outer wall of the pipe.
  • Each contact face may define a curvature being a sector of a circle having an axis of symmetry which is arranged parallel to and eccentrically with respect to the rotation axis of the corresponding retaining member, said rotation axis being arranged axially between the axis of symmetry and the opening of the housing.
  • rotations of a retaining member about the rotation axis will cause the contact face to move inwards or outwards with respect to the interior of the housing. This will be explained in further detail below.
  • the contact faces of the retaining members may be biased in a direction towards the opening of the housing.
  • the bias force may advantageously urge the contact faces into a position where the opening defined by them has a smaller diameter than a defined minimum diameter of pipes adapted to be received in the socket, preferably further allowing for an axial misalignment of the pipe and the socket. In this way, it is ensured that an inserted pipe end is always caught by the retaining members.
  • the bias force may be exerted by spring means.
  • the spring means may be a single device biasing all of the retaining members at the same time.
  • the retaining members may further be prevented from moving radially outwards, preferably by the housing, either directly or indirectly. Hence, an attempt to retract the pipe from the socket will cause the contact faces to move radially inwards, thereby tightening the grip around the pipe, which eventually prevents the pipe from retracting.
  • the contact faces may be provided with teeth or a rough surface in order to increase the friction between the retaining members and the pipe.
  • the teeth may have an asymmetric triangular form arranged so that the insertion of the pipe end is facilitated.
  • the retaining members may be arranged at equal angular distances from each other.
  • the angular width of the contact faces may preferably be dimensioned according to restrictions on the surface pressure on the pipe material.
  • the retaining members may be held in place by a fixing structure.
  • the fixing structure may also serve as the spring means.
  • the fixing structure may be part of the gasket support, preferably as an integrally moulded part thereof.
  • the fixing structure may be part of the housing.
  • the spring means and/or the retaining members to be located below the pipe may be dimensioned stronger than the rest in order to compensate for the weight of heavy pipes during insertion of the pipe into the socket, thereby ensuring that the pipe does not by gravity end up in a position with its axial centre too far below the axial centre of the socket, which could cause leaks or reduce the capability of the retaining members to retain the pipe in the socket.
  • Each retaining member may comprise a bearing projection on one or on both sides with the rotation axis passing through the bearing projections.
  • the fixing structure may comprise an inner bearing surface directed radially outwards and adapted to abut the bearing projections.
  • the inner wall of the housing may comprise an outer bearing surface directed radially inwards and adapted to abut the bearing projections.
  • the outer bearing surface may be arranged in a housing part, which comprises the housing opening.
  • the fixing structure may comprise further means for keeping the bearing projections of the retaining members in abutment with the inner bearing surface, even when the fixing structure and the outer bearing surface are away from each other, e.g. before assembling the socket.
  • the fixing structure may further comprise axial bearing surfaces adapted to abut the bearing projections in the axial directions.
  • the retaining members may be mounted on a fixing structure, and the fixing structure may form part of the annular gasket support. Alternatively, a separate fixing structure may be used, or the retaining members may be mounted directly on the housing.
  • the retaining members may advantageously be made from a metal, such as stainless steel, cast iron or brass, or from a plastic material, depending on the material of the pipes to be inserted in the socket.
  • the socket may further comprise an additional gasket arranged at the opening of the housing.
  • Such an additional gasket may be used for preventing, e.g., dirt, soil or water from entering the socket housing after connecting the pipe and the socket, thus preventing wear or corrosion of parts of the socket or the pipe, e.g. retaining members.
  • the additional gasket may also be adapted to prevent water or air from being sucked into the pipe if an underpressure occurs in the pipe.
  • the additional gasket may be supported by a second gasket support. During assembly of the pipe joint, the additional gasket and the second gasket support may be arranged on the pipe before insertion thereof into the socket, and after the insertion they may be connected to the socket.
  • the additional gasket is preferably made from a resilient material, such as a rubber or a rubber-like plastic material.
  • the socket may further comprise a flange arranged on the housing at a position opposite to the position of the opening of the housing, the flange being adapted to be connected to a flange on, e.g., a valve or a flanged end part of a pipe.
  • the flange may be connected to a flange arranged on another similar or identical socket, or two similar or identical sockets may be incorporated in a single housing.
  • two pipes may be connected via the two sockets, simply by inserting the pipes into a respective one of the sockets, and the angle between the two pipes may be determined by the respective positions of the openings of the housings of the two sockets.
  • the two sockets may be connected by a ball joint, thereby allowing the angle between the pipes to be adjusted on site.
  • the socket may form an integral part of, e.g., a valve or an end of a pipe.
  • a pipe joint comprising a socket according to the first aspect of the invention, and a pipe having its end part inserted in the socket in such a manner that the pipe protrudes through the opening of the housing and in such a manner that the gasket abuts an outer wall of the pipe in a substantially fluid tight manner.
  • Fig. 1 is a perspective view of a socket according to an embodiment of the invention
  • Fig. 2 is a cross sectional and perspective view of the socket of Fig. 1,
  • Fig. 3 is a cross sectional view of the socket of Figs. 1 and 2,
  • Fig. 4 is a schematic illustration of a retaining member for the socket of Figs. 1- 3, and
  • Fig. 5 is a side view of the retaining member of Fig. 4. DETAILED DESCRIPTION OF THE DRAWINGS
  • Fig. 1 is a perspective view of a socket 1 according to an embodiment of the invention.
  • the socket 1 comprises a housing 2 with a first housing part 2a and a second housing part 2b.
  • the first housing part 2a is provided with an opening 3 allowing an end part of a pipe to pass.
  • a gasket 4 is arranged at the opening 3.
  • the second housing part 2b is provided with a flange 5 adapted to be connected to a flange on, e.g., a valve, to a flanged end of a pipe, or to another identical or similar socket 1.
  • Fig. 2 is a cross sectional and perspective view of the socket 1 of Fig. 1, allowing the interior of the housing 2 to be seen.
  • An annular gasket 6 is arranged inside the housing 2.
  • the annular gasket 6 is made from a resilient material, such as a rubber or a rubber-like plastic material.
  • the annular gasket 6 is attached to an inner wall of the housing 2 via an O-ring like sealing projection 7 arranged at the interface between the first housing part 2a and the second housing part 2b.
  • the sealing projection 7 ensures a substantially fluid tight attachment of the annular gasket 6 to the inner wall of the housing 2.
  • the annular gasket 6 extends from the inner wall of the housing 2 to an inner rim 8 in a sloping manner, providing the annular gasket 6 with a substantially conical shape, the apex of the cone facing away from the opening 3 of the housing 2.
  • the inner rim 8 of the annular gasket 6 defines an opening through which an end of a pipe can be received.
  • the socket 1 further comprises an annular gasket support 9 which is provided with a plurality of support members 10, seventeen of which are visible, arranged immediately adjacent to the annular gasket 6.
  • the annular gasket support 9, or at least the support members 10, is made from a relatively stiff material, e.g. a plastic material or stainless steel. Thereby the support members 10 are able to support the annular gasket 6 in such a manner that the substantially conical shape of the annular gasket 6 is maintained.
  • Each of the support members 10 is adapted to perform pivotal movements relatively to the annular part of the annular gasket support 9 and about a pivot point arranged at the interface between the support member 10 and the annular part of the annular gasket support 9.
  • the socket 1 further comprises a plurality of retaining members 11, eight of which are visible, the retaining members 11 being arranged substantially equidistantly along the inner wall of the housing 2.
  • Each of the retaining members 11 is mounted rotatably on the inner wall of the housing 2 in a manner which will be described in further detail below with reference to Figs. 4 and 5.
  • Fig. 3 shows a cross sectional view of the socket 1 of Figs. 1 and 2.
  • the socket 1 of Figs. 1-3 is adapted for connection with pipes having an outer diameter within a range between a defined minimum diameter and a defined maximum diameter.
  • the defined minimum diameter may advantageously correspond to the diameter of the opening defined by the inner rim 8 of the annular gasket 6 when the gasket 6 and the support members 10 are in a relaxed state, i.e. when no outer influences affect the gasket 6 and/or the support members 10.
  • the defined inner diameter is the smallest diameter of a pipe which can be tightly abutted by the inner rim 8 of the annular gasket 6. It may be slightly larger in order to allow for misalignment of the axes of the socket and the pipe.
  • the defined maximum diameter may advantageously be the diameter of the opening 3 of the housing 2. Thereby the maximum defined diameter is the largest diameter of a pipe which is allowed to pass through the opening 3.
  • the socket 1 of Figs. 1-3 preferably functions in the following manner.
  • an end part of the pipe is inserted into the socket 1 via the opening 3 of the housing 2 and moved onwards through the opening defined by the inner rim 8 of the annular gasket 6.
  • the pipe must have an outer diameter which is within the range between the defined minimum diameter and the defined outer diameter. Thereby the pipe has a diameter which exceeds the diameter of the opening defined by the inner rim 8 of the annular gasket 6 in a relaxed state.
  • the pipe pushes against the inner rim 8 of the annular gasket 6, thereby moving the inner rim 8 as well as the free ends of the support members 10 in an axial direction away from the opening 3 of the housing 2.
  • the pressurised medium When a pressure is subsequently applied to the inside of the socket 1 and the pipe, the pressurised medium will exert a force on the annular gasket 6, the force being directed partly radially outwards and partly axially towards the opening 3 of the housing 2. Thereby the annular gasket 6 is forced against the support members 10. The free ends of the support members 10 will thereby be forced against the outer wall of the pipe, which will eventually prevent them from pivoting further. Thus, the support members 10 ensure that a substantially conical shape of the annular gasket 6 is maintained, the apex of the cone facing away from the opening 3 of the housing 2.
  • the support members 10 are dimensioned and arranged such that any openings in the support surface are small enough to prevent the gasket 6 from protruding through the openings to an extent which could cause a leak or damage the gasket 6, even at high pressures inside the socket 1.
  • the allowable dimensions of such openings depend highly on the maximum socket pressure as well as on the type and thickness of the material used for the gasket 6. As an example, a socket 1 having a rubber gasket 6 with a thickness of 4 mm and openings in the support surface with diameters not exceeding 6 mm withstood a test pressure of 28 bar without problems.
  • the pipe further abuts contact faces 12 of the retaining members 11.
  • the retaining members 11 are mounted in such a manner that each of them is rotatable about a rotational axis which is arranged tangentially to the inner wall of the housing 2. Furthermore, the contact faces 12 of the retaining members 11 are curved in such a manner that they form a sector of a circle. The centre of the circle for a given retaining member 11 does not coincide with the rotational axis of that retaining member 11.
  • the retaining members 10 will be caused to rotate about their respective rotational axes by the pipe so that the contact faces 12 move axially away from the opening 3 of the housing 2 and thereby radially outwards, thus increasing the opening defined by them and leaving space for the pipe to be inserted. Furthermore, in the case that it is attempted to retract the pipe from the socket the retaining members 11 will rotate about their respective rotational axes, and thereby the contact faces 12 are caused to move radially inwards, thereby tightening the grip on the pipe. Retraction of the pipe is thereby prevented.
  • the geometry of the retaining members 11 will be described in further detail below with reference to Figs. 4 and 5.
  • the gasket 4 arranged at the opening 3 of the housing 2 prevents unwanted substances, such as dirt, soil or water, from entering the housing 2 of the socket 1 after connection between the pipe and the socket 1, thus preventing or reducing wear and corrosion of the retaining members 11 and other parts of the socket 1 or the pipe.
  • the gasket 4 may further prevent water or air from being sucked into the pipe in the case that an underpressure occurs in the pipe.
  • the gasket 4 is preferably arranged on the pipe prior to assembling of the pipe joint and, after the assembling, is moved into its proper position by hand or with a suitable tool.
  • Fig. 4 is a schematic illustration of a retaining member 11 for the socket 1 of Figs. 1-3.
  • Fig. 4 illustrates that the contact face 12 of the retaining member 11 has a curvature which follows a part of a circle 13.
  • the centre of the circle 13 is arranged at 14.
  • the contact face 12 is provided with teeth which increase the friction between the contact face 12 and a pipe inserted in the socket 1.
  • the retaining member 11 is rotatable about rotation axis 15 which is arranged eccentrically relative to the centre 14 of the circle 13.
  • the rotation axis 15 is arranged closer to the opening 4 of the housing 2 than the centre 14 of the circle 13. Accordingly, rotating the retaining member 11 about rotational axis 15 in a direction that causes the contact face 12 to move towards the opening 4 also causes the contact face 12 to move in the direction indicated by arrow 16.
  • the direction indicated by arrow 16 is substantially radially inwards.
  • the retaining members 11 tighten their grip on the outer wall of the pipe and thereby retain the pipe as described above with reference to Figs. 1-3.
  • Fig. 5 is a side view of the retaining member 11 of Fig. 4.
  • the retaining member 11 is mounted inside the housing 2 of the socket 1 via a fixing structure 17 attached to the housing 2 and a protrusion 18 on the retaining member 11.
  • the fixing structure 17 may advantageously form part of or be mounted on the gasket support 9.
  • the protrusion 18 defines the rotation axis 15 of the retaining member 11.
  • the housing 2 is shown in a cross sectional view.
  • a spring member 19 is attached to the housing, and is arranged in abutment with the retaining member 11. The spring member 19 thereby biases the retaining member 11 in a radially inwards direction and in an axial direction towards the opening 3 of the housing 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)

Abstract

L'invention porte sur une douille (1) pour raccord de tubes comprenant: un logement (2), un joint annulaire élastique (6) disposé à l'intérieur du logement (2), et un support annulaire de joint (9). Le logement (2) présente une ouverture (3) conçue pour recevoir l'extrémité d'un tube devant être raccordé à la douille (1). Le joint annulaire élastique (6), fixé à la paroi intérieure du logement (2) de manière quasiment étanche, présente un bord intérieur (8) butant sur la paroi extérieure du tube insérée dans l'ouverture (3) du logement (2). Le support (9) du joint annulaire est disposé à l'intérieur du logement (2) de manière à supporter le joint (6), au moins quand le joint du tube est soumis à une pression interne. Le support de joint (9) comprend au moins deux éléments (10), montés chacun pivotants et mobiles dans la partie intérieure du logement (2). Le joint annulaire (6) et le support de joint (9) assurent du fait de cette combinaison un ajustement très serré entre le joint (6) et le tube inséré dans la douille (1), particulièrement quand le joint du tube est soumis à la pression interne. La douille (1) est de préférence configurée de telle sorte que des tentatives de retirer le tube de la douille (1) produisent un ajustement encore plus serré. La douille (1) peut comprendre, disposés à l'intérieur du logement (2), un ou plusieurs éléments de retenue (11) conçus pour exécuter des mouvements autour d'un axe de rotation (15) tangent à l'axe longitudinal du logement (2). Les éléments de retenue (11) empêchent le tube de se déplacer dans la douille (1).
PCT/EP2009/060567 2008-08-28 2009-08-14 Douille pour raccord de tubes WO2010023120A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200801183 2008-08-28
DKPA200801183 2008-08-28

Publications (1)

Publication Number Publication Date
WO2010023120A1 true WO2010023120A1 (fr) 2010-03-04

Family

ID=41471023

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/060567 WO2010023120A1 (fr) 2008-08-28 2009-08-14 Douille pour raccord de tubes

Country Status (1)

Country Link
WO (1) WO2010023120A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3202367A1 (de) * 1981-02-03 1982-10-21 Contraves AG, 8052 Zürich Steckmuffen-rohrverbindung
DE3116061A1 (de) * 1981-04-22 1982-11-11 WOCO Franz-Josef Wolf & Co, 6483 Bad Soden-Salmünster Steckmuffe
US5067751A (en) * 1990-07-27 1991-11-26 American Cast Iron Pipe Company Gasket for field adaptable push-on restrained joint and joint thus produced
EP1092904A1 (fr) * 1999-10-15 2001-04-18 M.O.L. GUMMIVERARBEITUNG GMBH & Co. KG Joint d'étanchéité pour un raccord à manchon entre deux tuyaux

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3202367A1 (de) * 1981-02-03 1982-10-21 Contraves AG, 8052 Zürich Steckmuffen-rohrverbindung
DE3116061A1 (de) * 1981-04-22 1982-11-11 WOCO Franz-Josef Wolf & Co, 6483 Bad Soden-Salmünster Steckmuffe
US5067751A (en) * 1990-07-27 1991-11-26 American Cast Iron Pipe Company Gasket for field adaptable push-on restrained joint and joint thus produced
EP1092904A1 (fr) * 1999-10-15 2001-04-18 M.O.L. GUMMIVERARBEITUNG GMBH & Co. KG Joint d'étanchéité pour un raccord à manchon entre deux tuyaux

Similar Documents

Publication Publication Date Title
US9341298B2 (en) End cap for a hydraulic fitting
KR101249324B1 (ko) 각을 이루어 배향된 공동을 갖는 커플링
RU2404390C2 (ru) Гидравлическая муфта
RU2373450C2 (ru) Соединительная муфта для труб
CA2721782C (fr) Raccord de canalisation avec presse-joint d'etancheite
JP2008506904A (ja) 流量調整を有するクイックコネクトを備えた給水遮断弁
US6279964B1 (en) Multiple-piece elbow assembly
US20220356974A1 (en) Swivelling coupling with external sealing element
US7828335B2 (en) Interchangeable pipe coupling
US10041613B1 (en) Universal coupling
JP2003232474A (ja) 管継手
WO2010023120A1 (fr) Douille pour raccord de tubes
US6286877B1 (en) Dual seal pipe coupling
RU2333416C2 (ru) Быстроразъемное шарнирное соединение для турбопроводов, содержащее запорное средство, установленное с возможностью вращения по отношению к охватывающей детали
TWI624612B (zh) 管接頭
JP6980204B2 (ja) マンホール用下水バイパス装置
PT2196713E (pt) Dispositivo, método e jogo de peças para formar uma união de montagem à pressão com um tubo
JP3762387B2 (ja) 管路の接続構造
RU2287733C1 (ru) Способ ремонта стеклопластикового трубопровода и ремонтный комплект для его осуществления
US20030080563A1 (en) Irrigation valve
JP4660186B2 (ja) 継手保持部材及び継手保持部材と継手部材とからなる器具
US9739401B1 (en) Pipe gripping elements and pipe joint restraints incorporating same
KR101796386B1 (ko) 소방용 스탠드 파이프
JP2007255684A (ja) 管継手
JP6913418B1 (ja) マンホールの下水バイパス装置用止水プラグ

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 09781868

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 09781868

Country of ref document: EP

Kind code of ref document: A1