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WO2008048123A2 - Joint pour raccord à compression - Google Patents

Joint pour raccord à compression Download PDF

Info

Publication number
WO2008048123A2
WO2008048123A2 PCT/NZ2007/000314 NZ2007000314W WO2008048123A2 WO 2008048123 A2 WO2008048123 A2 WO 2008048123A2 NZ 2007000314 W NZ2007000314 W NZ 2007000314W WO 2008048123 A2 WO2008048123 A2 WO 2008048123A2
Authority
WO
WIPO (PCT)
Prior art keywords
seal
fitting
perimeter portion
compression
perimeter
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.)
Ceased
Application number
PCT/NZ2007/000314
Other languages
English (en)
Inventor
Brian Haigh
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.)
Haigh Tooling Ltd
Original Assignee
Haigh Tooling Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Haigh Tooling Ltd filed Critical Haigh Tooling Ltd
Publication of WO2008048123A2 publication Critical patent/WO2008048123A2/fr
Anticipated expiration legal-status Critical
Ceased 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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on, or into, one of the joint parts
    • F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
    • F16L19/0212—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member using specially adapted sealing means

Definitions

  • the present invention relates to a seal for a plumbing fitting and in particular to a seal for a compression joint, i.e. a joint where two pipes are connected together using a compression nut and a seal.
  • the present invention further relates to a compression joint incorporating this seal.
  • seal of the present invention has been developed especially for sink waste traps, and therefore will be described with particular reference to this application. However, it will be appreciated that the seal of the present invention may be used for any of a range of applications where a compression joint is required, and a second embodiment will be described with reference to a larger-scale, general- purpose compression joint.
  • a compression joint to connect, e.g. a pipe with a fitting such as an S-bend.
  • a compression joint an annular seal is fitted around the outer surface of the pipe, which has a slightly smaller outer diameter than the internal diameter of the fitting with which it is to be connected.
  • the end of the pipe carrying the seal is then slid into the end of the fitting; the end is externally screw threaded.
  • a compression nut is then slid over the outer surface of the pipe and over the joint area; the compression nut is internally screw threaded with a tapered thread.
  • the compression joint described above can be very fiddly to use in practice:- bearing in mind that the joint may have to be made in a very confined space and/or working at an awkward angle, removing the compression nut from the end of the fitting, sliding both the nut and a loose seal onto the end of the pipe, engaging the end of the pipe with the fitting, and then tightening the nut, can be a difficult job. Disclosure of Invention
  • the present invention provides a seal for a compression joint, said seal including an annulus having:
  • the cross-sectional shape of the seal is bilaterally symmetrical, such that the seal is reversible in use.
  • each perimeter portion terminates in a flat at each outer edge of the seal.
  • the present invention further provides a seal assembly for a compression joint, said seal assembly including:
  • each spacing ring being made of a more rigid material than the or each seal
  • the or each seal having: a substantially smooth inner surface; and outer surface having a perimeter portion around each edge of the seal and a central section between the perimeter portions; each perimeter portion being at a first angle to said inner surface; the thickness of the central section being greater than the thickness of either of the perimeter portions; the material of which the seal is made and the thickness of the outer edge of each perimeter portion being such that each perimeter portion can flex inwards when subjected to an inward pressure in use; - the portion of each spacing ring adjacent each edge of the or each seal being inclined at a second angle which is different to said first angle, such that when each perimeter portion of the or each seal is forced into contact with said adjacent portion of said spacing ring, the spacing ring effects inward flexion of said perimeter portion.
  • Figure 1 is a side view of a seal in accordance with a first embodiment of the present invention
  • Figure 2 is a cross-section through the seal of Figure 1 ;
  • Figure 3 is a longitudinal section through the parts of a compression joint in accordance with the first embodiment of the present invention, before assembly;
  • Figure 4 is a longitudinal section through an assembled compression joint in accordance with Figure 3;
  • Figure 5 is a longitudinal section through the parts of a compression joint in accordance with a second embodiment, before assembly;
  • Figure 6 is a longitudinal section through an assembled compression joint in accordance with Figure 5;
  • Figure 7 is an enlargement of part of Figure 6;
  • Figure 8 is a cross-section through a further embodiment of a seal.
  • a seal 10 in accordance with the present invention is an annulus with a smooth inner surface 11 and a shaped outer surface 12.
  • the two perimeter portions 13, 14 of the seal each have an angle of inclination a relative to the surface 11 of approximately 45°.
  • Each portion 13, 14 terminates at its outer edge in a flat 15, 16, rather than tapering to a feather edge.
  • the flat 15, 16 means that each edge of the seal is robust and is not easily damaged, but the taper of the perimeter portions provides comparatively flexible edges which can flex inwards when a compression nut is tightened over the seal.
  • the height of each flat 15, 16 is 11-12% of the total thickness of the seal.
  • the seal is a good fit inside the nut, to prevent the seal becoming misplaced before or during fitting.
  • the clearance between the exterior of the seal and the nut should be of the order of 0.2mm. It also is important that there is adequate clearance (typically 1-1.5mm) between the interior of the seal and the exterior of the pipe to be fitted within the seal, so that the pipe can slide easily through the seal during fitting.
  • each perimeter portion 13, 14 Immediately adjacent each perimeter portion 13, 14 is an inclined portion 17, 18 which has an angle of inclination b relative to the surface 11 of about 15°. Centrally between the inclined portions 17, 18 is a rib 19 which is parallel to the surface 11. The inclined portions 17 and 18 and the rib 19 together make up the central section of the seal.
  • the portions 13 and 14 are equal in width, as are the portions 17 and 18, so that the seal is symmetrical and reversible:- it cannot be placed in the fitting the wrong way round.
  • the seal is formed with the rib 19 simply for ease of manufacture; this feature is not essential.
  • the seal may be made of any suitable tough, resilient, compressible material, e.g. thermoplastic rubber.
  • Figures 3 and 4 show the parts of a typical compression joint:- a compression nut 20, the upper part of a fitting 21 , a pipe 22 and the seal 10.
  • the compression nut 20 and the corresponding portion of the fitting 21 are standard compression joint design.
  • the compression nut 20 is then tightened down onto the screw thread 24 of the fitting 21 in the usual way, applying pressure in the direction of arrows P. This pushes one perimeter portion 13 of the seal 10 into tight engagement with the rim 23 of the compression nut and the other perimeter portion 14 of the seal into engagement with the tapered upper edge 25 of the fitting 21.
  • Both the outer rim 23 of the compression nut and the upper edge 25 of the fitting 21 are tapered to an angle less than the angle of the corresponding perimeter portion 13, 14 of the seal; typically, the rim 23 and the edge 25 tapered at an angle of about 27°.
  • a seal for a compression joint is provided by a multipart sealing assembly 50, which includes two seals 51 ,52 and three spacing rings 53, 54 and 55.
  • the arrangement shown in these Figures is suitable for use with larger-diameter pipes (e.g. 200mm external diameter) and may be used e.g. to secure a single pipe to another fitting or to secure to pipes together end to end.
  • each of the seals 51 ,52 is identical to the seal 10 described with reference to Figures 1 and 2.
  • the seals 51 ,52 may be formed separately, as shown in Figure 5, or may be formed with a connecting web 56 (shown in broken lines) connecting the adjacent edges of the seals.
  • the connecting web 56 is used simply for convenience in handling the seals 51 ,52 and does not contribute to the formation of a seal.
  • Each of the spacing rings 53-55 is an annulus made of a rigid, tough, abrasion resistant, low friction material (e.g. polypropylene) and has a cross-sectional shape as shown in Figure 7:- the outer surface 60 is smooth and the inner surface provides a central rib 62 flanked on each side by a sloping peripheral portion 63,64.
  • the spacing rings are bilaterally symmetrical in cross-section.
  • the angle of inclination of each sloping peripheral portion 63,64 is less than the angle of the corresponding perimeter portion 13,14 of the seal; typically the angle of inclination x is approximately 27° compared to the angle a of the perimeter portion is 13,14 of approximately 45°.
  • Each seal 51 ,52 is arranged with a spacing ring on each side of the seal; if a connecting web 56 is formed between adjacent seals, then the spacing ring overlies the web.
  • a half-thickness spacing ring 55 may be used in place of a full thickness spacing ring, since only half of the spacing ring will be required.
  • an angled compression surface can be formed on the interior of the compression nut, as described with reference to the first embodiment.
  • the frictional forces are such that the compression nut tends to lock onto the seal material and twist the seal out of alignment, and so it is preferred to provide a top spacing ring 55 (whether half or full thickness) to provide a low friction surface over which the compression nut can slide.
  • the seal is accommodated in the interior of an externally screw threaded fitting 70, rather than in the interior of the compression nut.
  • the interior of the fitting 70 is smooth walled, and the seals 51 ,52 and spacing rings 53-55 are a snug fit inside the fitting.
  • the fitting 70 may be formed at the end of another fitting, or may be formed as a separate collar if it is to be used to connect two pipes end to end.
  • the seals 51 ,52 and spacing rings 53-55 are arranged alternately inside the fitting 70, with each seal 51 ,52 arranged with a spacing ring at each side.
  • the half thickness spacing ring 55 is positioned around the outermost edge of the outermost seal 51.
  • An internally threaded compression nut 71 of known type is partially engaged with the external screw thread on the fitting 70, and a pipe 73 to be connected to the fitting 70 is pushed into the fitting 70, to the desired position relative to the fitting.
  • the compression nut 71 is then tightened on to the fitting 70 in known manner, applying pressure in the direction of arrows P.
  • each of the seals 51 ,52 is compressed, in the same manner as described with reference to Figures 1-4, with the seals 51 ,52 being pushed tightly against the adjacent spacing rings 53-55 so that the difference between the angles of inclination a and x results in the perimeter portions 13,14 of each seal being flexed or rolled inwards towards the pipe 63 to form a tight seal against the pipe.
  • Figure 8 shows a cross-section through a three seal sealing assembly 80 in which three seals 81 ,82,83, are formed with a connecting web 84 and are separated by spacing rings 85 - 88.
  • the perimeter portions of each seal are cut as right angles steps, with each step in providing a first portion 90 which is spaced from, but in a plane parallel to, the inner surface 89, and the second portion 91 which lies in a plane at right angles to the plane of the first portion.
  • Adjacent seals are separated by spacing rings 85 - 88; the spacing rings are formed with inclined sides 93,94 which are inclined at an acute angle to the base 95 of the ring.
  • the angle of inclination y is depicted as approximately 45° but may in fact be any of a wide range of acute angles.
  • the precise angles of the perimeter portions of the seal and the angles of the corresponding portions of the rim and the edge (in the case of the embodiment of Figures 1 - 4) or of the spacing rings (in the case of the embodiments of Figures 5 - 8) are not important, since the only requirement is that the rim and edge/spacing rings can distort the perimeter portions of the seals when pressure is applied by the compression nut in the direction of arrow P.
  • the rim and edge/spacing rings must be made of a more rigid material than the seal or seals, and the angles of the perimeter portion of each seal must be different to the angle of the corresponding portion of the rim and edge/spacing rings.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gasket Seals (AREA)

Abstract

Cette invention concerne un joint pour raccord à compression, lequel joint comprend un élément annulaire comportant une surface intérieure sensiblement lisse et une surface extérieure comportant d'une part une partie de périmètre autour de chaque bord du joint et d'autre part une partie centrale entre les parties de périmètre. Selon cette invention, l'épaisseur de la partie centrale est supérieure à celle des parties de périmètre et la matière dans laquelle le joint est fabriqué de même que l'épaisseur du bord extérieur de chaque partie de périmètre permettent à chaque partie de périmètre d'être pliée vers l'intérieur en cas de pression vers l'intérieur en cours d'utilisation.
PCT/NZ2007/000314 2006-10-20 2007-10-19 Joint pour raccord à compression Ceased WO2008048123A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ550701 2006-10-20
NZ55070106 2006-10-20

Publications (1)

Publication Number Publication Date
WO2008048123A2 true WO2008048123A2 (fr) 2008-04-24

Family

ID=39314481

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NZ2007/000314 Ceased WO2008048123A2 (fr) 2006-10-20 2007-10-19 Joint pour raccord à compression

Country Status (1)

Country Link
WO (1) WO2008048123A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111102405A (zh) * 2020-01-18 2020-05-05 湖南天力瑞家新材科技股份有限公司 一种新型管道连接件
CN111156361A (zh) * 2020-01-18 2020-05-15 湖南天力瑞家新材科技股份有限公司 一种管件密封连接件
CN111188954A (zh) * 2020-01-18 2020-05-22 湖南天力瑞家新材科技股份有限公司 一种新型管道连接件

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111102405A (zh) * 2020-01-18 2020-05-05 湖南天力瑞家新材科技股份有限公司 一种新型管道连接件
CN111156361A (zh) * 2020-01-18 2020-05-15 湖南天力瑞家新材科技股份有限公司 一种管件密封连接件
CN111188954A (zh) * 2020-01-18 2020-05-22 湖南天力瑞家新材科技股份有限公司 一种新型管道连接件

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