SE516190C2

SE516190C2 - Included in a pipe joint to preferably polyethylene pipe, pipe coupling end, method and apparatus for its manufacture and way to joint such pipe ends

Info

Publication number: SE516190C2
Application number: SE0001335A
Authority: SE
Inventors: Lennart Berg
Original assignee: Lennart Berg
Priority date: 2000-04-11
Filing date: 2000-04-11
Publication date: 2001-11-26
Also published as: SE0001335D0; WO2001077567A1; AU2001247039A1; SE0001335L

Abstract

The present invention relates to a pipe-connecting part (12) provided on at least one of the pipe-ends (11) included in a pipe-connection (1) preferably for polyethylene pipes intended for high media pressures. The pipe-connecting part (12) consists of a step-formed sleeve (14) with the same inside diameter all along its length and at least two from the central part of the sleeve (14) on both sides of a step (15) in both directions reaching sleeve-parts (16, 17). One of the sleeve-parts (16) is made with a sharp edge in its free end to make possible the cut-away of a predetermined part (19) of the inner mantle-surface of the pipe (2) during fitting, while at the same time the sleeve-part (16) has an outside dimension somewhat larger than the inside diameter of the actual pipe-end (11) and the other sleeve-part (17) has an outside dimension mainly as large as the outside diameter of the actual pipe-end (11) and is co-operative with parts included in the pipe-connection (1). The invention also relates to a method and a device for manufacturing a pipe-connecting part equipped pipe-end, included in said pipe-connection.

Description

pø-v-m»wf.v,qf-f»-,,.,v-~... -f - v..-,~.~-,.....--v|~w-v,.ﬂ,.ﬁﬂv~,«»>mw...,...>.~, - ._ vu.,ns.f,n~fv-nwf--ww»w;mn»mvn.mh~,... w 516 190 . ,....«,f.-...v-ww--n n u u . ø - - n o n nu nn o Syftet med föreliggande uppfinning är att undanröja de nack- delar som beskrivs ovan och åstadkomma en rörskarv' med en rörkopplingsförsedd ände av inledningsvis nämnd typ samt ett förfarande och en anordning för tillverkning av densamma. De för uppfinningen utmärkande särdragen finns angivna i efter- följande patentkrav. pø-vm »wf.v, qf-f» - ,,., v- ~ ... -f - v ..-, ~. ~ -, .....-- v | ~ wv ,. ﬂ , .ﬁﬂ v ~, «»> mw ..., ...>. ~, - ._ vu., ns.f, n ~ fv-nwf - ww »w; mn» mvn.mh ~, .. .w 516 190. , .... «, f.-... v-ww - n n u u. The object of the present invention is to obviate the disadvantages described above and to provide a pipe joint with a pipe-coupled end of the type mentioned in the introduction and a method and a device for manufacturing the same. The features characteristic of the invention are set out in the following claims.

Tack vare uppfinningen har man nu åstadkommit en rörskarv, som pä ett utmärkt sätt fyller sina syften samtidigt som tillväga- gångssàttet att skarva med hjälp av det monteringsdon, som används enligt uppfinningen, är snabbt och billigt att genom- föra samtidigt som framstàllningskostnaden av själva skarven enligt uppfinningen kan hållas låg. Med hjälp av rörkopplings- delen enligt uppfinningen kan man åstadkomma en rörskarv för speciellt polyetenrör som garanterar en fullständigt säker tätning även för höga medietryck utan behov av någon elektrisk utrustning. Medelst rörkopplingsdelen, som ingår i skarven, kan man förutom att skarva sådana rörlängder, som har anslutnings- delar stumsvetsade på fabrik, nu även ansluta rör av valfri längd. Denna metod baseras på att polyeten vid uppvärmning till runt l20° C mjuknar så mycket att man lätt kan skära i materialet och en annan förutsättning år att plasten har ett lågt värmeledningstal, eftersom det yttre partiet av röret av stabiliseringsskäl ej skall mjukna, vilket icke heller sker om temperaturen där år endast ca ll0°C.Thanks to the invention, a pipe joint has now been provided which fulfills its purposes in an excellent manner, while the method of splicing by means of the mounting device used according to the invention is quick and inexpensive to carry out at the same time as the manufacturing cost of the joint itself. according to the invention can be kept low. With the aid of the pipe coupling part according to the invention, a pipe joint can be provided for special polyethylene pipes which guarantees a completely safe seal even for high medium pressures without the need for any electrical equipment. By means of the pipe coupling part, which is included in the joint, in addition to splicing such pipe lengths, which have connecting parts butt-welded at the factory, it is now also possible to connect pipes of any length. This method is based on the polyethylene softening when heated to around 120 ° C so much that it is easy to cut the material and another condition is that the plastic has a low thermal conductivity, since the outer part of the pipe should not soften for stabilization reasons, which neither occurs if the temperature there is only about 110 ° C.

Uppfinningen beskrivs närmare nedan med hjälp av ett före- draget utföringsexempel, under- hänvisning' till bifogade rit- ning, pà vilken Fig. 1 visar en schematisk längdsektionsvy av en skarv av två plaströr enligt föreliggande uppfinning, Fig. 2 visar en vy ovanifrån av den i fig. 1 visade skarven, Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig.The invention is described in more detail below by means of a preferred embodiment, with reference to the accompanying drawing, in which Fig. 1 shows a schematic longitudinal sectional view of a joint of two plastic pipes according to the present invention, Fig. 2 shows a top view of the joint shown in Fig. 1, Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Figs.

Såsom framgår av fig. - n o | n n o n n u no u 516 190 a .... nu visar ett tvärsnitt genom skarven längs linjen III-III i fig. 1, visar en lângdsektionsvy av en i skarven enligt fig. 1 ingående rörkopplingsdel enligt föreliggande uppfin- ning, visar en schematisk snittvy av en anordning i form av ett monteringsdon för montering av den i fig. 4 visade rörkopplingsdelen i en rörânde och vilket don visas i ett första moment då detta lägesfixerats över den ak- tuella rörânden och innan rörkopplingsdelen skjutits in i röret, visar det i fig. 5 visade monteringsdonet i ett läge då rörkopplingsdelen inskjutits i röret och innan monte- ringsdonets såg eller kniv avlägsnat överskottsmaterial i röret, visar en längdsektionsvy genom rörânden. med färdig- monterad rörkopplingsdel med påsatt, kraftupptagande rundfläns för samverkan med ett i rörskarven ingående ytterhus, visar en längdsektionsvy av själva monteringsdonet, och 9 visar en ândvy av det i fig. 8 visade monteringsdonet, 1 utgörs uppfinningen enligt ett före- draget utföringsexempel av en rörskarv 1 till polyetenrör 2,3 avsedda för höga medietryck.As shown in Fig. - n o | nnonnu no u 516 190 a .... now shows a cross section through the joint along the line III-III in Fig. 1, shows a longitudinal sectional view of a pipe coupling part according to the present invention included in the joint according to Fig. 1, shows a schematic sectional view of a device in the form of a mounting device for mounting the pipe coupling part shown in Fig. 4 in a pipe end and which device is shown in a first step when this is positioned over the actual pipe end and before the pipe coupling part is pushed into the pipe, it shows in fig. 5 shows the mounting device in a position when the pipe coupling part is inserted into the pipe and before the mounting device's saw or knife has removed excess material in the pipe, shows a longitudinal sectional view through the pipe end. with pre-assembled pipe coupling part with attached, force-absorbing round flange for cooperation with an outer housing included in the pipe joint, shows a longitudinal sectional view of the mounting device itself, and 9 shows an end view of the mounting device shown in Fig. 8, 1 the invention is according to a preferred embodiment of a pipe joint 1 to polyethylene pipes 2,3 intended for high medium pressures.

Rörskarven 1 uppvisar anslut- ningsdelar 4,5 där åtminstone den ena har en obruten cylindrisk eller konisk form och vilka är sammandragbart hophàllbara medelst ett ytterhus 6. Ytterhuset 6 utgörs av två halvor 7 och 8 vilka är hopdragbara med hjälp av skruvar 9 och muttrar 10. I det visade utföringsexemplet utgörs den ena anslutningsdelen 4 . ,,...,......-.«.,.,,.,,.,,,,,,.,..,,,,,,,,,,,..,,..,.,,,....vf-»..._ . , _, ..,., ,..,...,..,,',~wwn-w_,,,,,.wﬂv-f,-f,v,,.-..,.>.-~ ._ , ....._.m-.-...,«ww«wvm-Wfv-wm-m,.._.. .. _ tm."-ﬂw.".,,,¶----,-...W."»,.-,.-,.,.W...v -- . ...vvu.,,....,,..,,...,..,......,,.W...,...,,.,,,..,...,.,,...WW n .. nu u . . - . . . o o - ~ u» 516 1 90 - -; av ett till valfri längd kapat rör 2, i vars ände 11 en rör- kopplingsdel 12, som kan 'vara tillverkad av rostfritt stål eller annat lämpligt material, är anbringad med hjälp av ett monteringsdon 13.The pipe joint 1 has connecting parts 4,5, at least one of which has an unbroken cylindrical or conical shape and which are contractibly collapsible by means of an outer housing 6. The outer housing 6 consists of two halves 7 and 8 which are contractible by means of screws 9 and nuts 10. In the exemplary embodiment shown, the one connecting part is 4. ,, ..., ......-. «.,. ,,. ,,. ,,,,,,., .. ,,,,,,,,,,, ,, ,,. .,. ,,, .... vf - »..._. , _, ..,.,, .., ..., .. ,, ', ~ wwn-w _ ,,,,,. w ﬂ v-f, -f, v ,, .- ..,.>. - ~ ._, ....._. m -.-..., «ww« wvm-Wfv-wm-m, .._ .. .. _ tm. "- ﬂ w.". ,,, ¶ ----, -... W. "», .-, .-,.,. W ... v -. ... vvu. ,, .... ,, .. ,,. .., .., ...... ,,. W ..., ... ,,. ,,, .., ...,. ,, ... WW n .. nu u. 516 1 90 - - of a pipe 2 cut to any length, at the end of which a pipe coupling part 12, which may be made of stainless steel or other suitable material, is attached with by means of a mounting device 13.

Rörkopplingsdelen 12, som närmare visas i fig. 4, utgöres av en med en plan anliggningsyta 14' utformad hylsa 14, som uppvisar samma innerdiameter' utmed. hela sin längd. men åtminstone två från hylsans 14 mittparti 15 åt vardera hållet sig sträckande hylspartier 16 och 17 med i det visade fallet olika ytter- diametrar. Det första hylspartiet 16, som har den mindre yt- terdiametern, har en spetsfasad ände 18 och en dimension, som är' något större än den. aktuella rörändens 11 innerdiameter.The pipe coupling part 12, which is shown in more detail in Fig. 4, consists of a sleeve 14 'formed with a flat abutment surface 14, which has the same inner diameter' along it. its entire length. but at least two sleeve portions 16 and 17 extending from the central portion 15 of the sleeve 14 in each direction, in the case shown, have different outer diameters. The first sleeve portion 16, which has the smaller outer diameter, has a pointed end 18 and a dimension slightly larger than that. the inner diameter of the current pipe end 11.

Hylspartiet 16 är införbart i rörânden 11 samtidigt som en förutbestämd del 19 av rörets 2 inre mantelyta skärs bort. Det andra hylspartiet 17 med den större ytterdiametern har en di- mension, som är i huvudsak lika stor som den aktuella rörändens 11 ytterdiameter och är dessutom samverkbar med de i rörskarven 1 ingående delarna. Vidare uppvisar det andra hylspartiet 17 vid sin yttre mantelyta 20 anliggningsytan 14' för rörânden 11 och en rundfläns 21 av polyeten eller metall för samverkan med ytterhuset 6, vilken skjutits upp på rörkopplingsdelen 12 och intilliggande rörparti och vilken lägesfixerats till rörkopp- lingsdelen 12 medelst en i ett spår 22' i hylspartiet 17 an- ordnad kraftupptagande metallring 22 i två halvor och en lä- gesfixerande spàrring 23, som i sin tur är infäst i ett spår 23' i rundflänsen 21.The sleeve portion 16 is insertable into the pipe end 11 at the same time as a predetermined part 19 of the inner jacket surface of the pipe 2 is cut off. The second sleeve portion 17 with the larger outer diameter has a dimension which is substantially equal to the outer diameter of the actual pipe end 11 and is also cooperable with the parts included in the pipe joint 1. Furthermore, the second sleeve portion 17 has at its outer jacket surface 20 the abutment surface 14 'for the pipe end 11 and a round flange 21 of polyethylene or metal for co-operation with the outer housing 6, which is projected onto the pipe coupling part 12 and adjacent pipe portion and which is positioned to the pipe coupling part 12 by means of a in a groove 22 'in the sleeve portion 17 arranged force-receiving metal ring 22 in two halves and a position-fixing locking ring 23, which in turn is fixed in a groove 23' in the round flange 21.

Det monteringsdon 13, som. används för fixering av rörkopp- lingsdelen 12 i den ena röränden 11 av röret 2, består av en yttre och en inre cylinderdel 24 respektive 25, vilka delar har en längd som överstiger rörkopplingsdelens 12 och är centrerade över varandra och sammanhålles av ett gavelparti 26. De bägge cylinderdelarna 24,25 har ett inbördes avstånd från varandra för bildande av en ringformad spalt 27, som medger rörkopp- lingsdelens 12 inskjutning i spalten 27 till anliggning mot ga- ,..,...,..,».......~.,..,.~.,,,--,p1mr.m... . _ ...H..,,.,......-.~-.W~-y.,..«-f.-,~w.,,...._,_.. , ._.-,,my...-,v,~ww,wrw-w-ww-fl-mfﬂ-~»~--~v.-- v. _ W....,...y.,..,....m-fp--ﬂ.vwn-ﬁ.-r.,,....,.._....._ . _ .....,..W...v,-"m-~««»,m~r-v~<- 516 190 iå-ëÅÃëfffš-ïïšïïfïï velpartiet 26. Vidare uppvisar den inre cylinderdelen 25 ett hàlrum 28 med en värmekälla 29 för uppvärmning inifrån av både rörkopplingsdelen 12 och den aktuella rörände 11, som är in- förbar i spaltens 27 främre parti 27' och till anliggning emot rörkopplingsdelen 12, före dess inskjutning och lägesfixering i röret 2. Monteringsdonet 13 uppvisar vidare på sin inre cylin- derdel 25 en på densamma fastkrympt hylsa 30 samt en i anslut- ning till dess fria ände anordnad hàlság eller kniv 31 med en ytterdiameter, som i huvudsak motsvarar den aktuella rörândens 2 innerdiameter för' möjliggörande av' en avkapning' av' över- skottsmaterial 19 fràn rörets 2 inre mantelyta efter rör- kopplingsdelens 12 fastsâttning.The mounting device 13, which. is used for fixing the pipe coupling part 12 in one pipe end 11 of the pipe 2, consists of an outer and an inner cylinder part 24 and 25, respectively, which parts have a length exceeding the pipe coupling part 12 and are centered over each other and held together by an end portion 26. The two cylinder parts 24,25 have a mutual distance from each other to form an annular gap 27, which allows the pipe coupling part 12 to be inserted into the gap 27 for abutment against the ga, .., ..., .., »... .... ~., ..,. ~. ,,, -, p1mr.m .... _ ... H .. ,,., ......-. ~ -.W ~ -y., .. «- f .-, ~ w. ,, ...._, _ .. , ._.- ,, my ...-, v, ~ ww, wrw-w-ww-fl-mf ﬂ- ~ »~ - ~ v .-- v. _ W ...., ... y., .., .... m-fp-- ﬂ. vwn- ﬁ.- r. ,, ...., .._....._. _ ....., .. W ... v, - "m- ~« «», m ~ rv ~ <- 516 190 iå-ëÅÃëfffš-ïïšïïfïï velpartiet 26. Furthermore, the inner cylinder part 25 has a cavity 28 with a heat source 29 for heating from the inside both the pipe coupling part 12 and the actual pipe end 11, which is insertable in the front part 27 'of the gap 27 and for abutment against the pipe coupling part 12, before its insertion and position fixation in the pipe 2. The mounting member 13 further has its inner cylinder part 25 a sleeve 30 crimped thereon and a neck saw or knife 31 arranged in connection with its free end with an outer diameter, which substantially corresponds to the inner diameter of the pipe end 2 in question in order to 'enable' a cutting 'of' over bulkhead material 19 from the inner mantle surface of the pipe 2 after the pipe coupling part 12 has been fastened.

I det visade exemplet användes en gasolbrännare 32 såsom vär- mekälla men vilket annat lämpligt uppvärmningsorgan som helst kan användas för att åstadkomma den nödvändiga uppvärmningen och då exempelvis induktionsvärme, hetluft eller dylikt. I det fall en gasolbrännare 32 används, sträcker sig såsom framgår av fig. 5, dess munstycke 40 in genom en öppning 41 i gavelpartiet 26, varvid dess gaslåga kan breda ut sig och brinna i hälrumet 28.In the example shown, a gas burner 32 is used as a heat source, but any other suitable heating means can be used to provide the necessary heating and then, for example, induction heat, hot air or the like. In the case where a gas burner 32 is used, as shown in Fig. 5, its nozzle 40 extends in through an opening 41 in the end portion 26, whereby its gas flame can spread and burn in the cavity 28.

För att underlätta nmntaget av rörkopplingsdelen 12 kan den yttre cylinderdelens 24 fria ände uppvisa en dragfjäder- anordning 33, vars fria ändparti 34 är fastgörbart ett stycke in på det aktuella röret 2 för att efter applicering av mon- teringsdonet 13 på röränden 11 men före inskjutningen av rör- kopplingsdelen 12 i röret 2, befinna sig i ett aktiverat, sträckt tillstånd. Genom den bildade fjäderkraften kommer så- ledes under monteringsförfarandet rörkopplingsdelen 12 som ett resultat av uppvärmningen att automatiskt tryckas in i röränden 11 och när monteringen är klar avlägsnas dragfjäderanordningen.To facilitate the assembly of the pipe coupling part 12, the free end of the outer cylinder part 24 can have a tension spring device 33, the free end portion 34 of which can be fastened a piece into the relevant pipe 2 so that after application of the mounting member 13 to the pipe end 11 but before insertion of the pipe coupling part 12 in the pipe 2, are in an activated, stretched state. Thus, due to the spring force formed during the mounting process, the pipe coupling part 12 will as a result of the heating be automatically pressed into the pipe end 11 and when the mounting is complete the tension spring device is removed.

Vid monteringen av rörkopplingsdelen 12 placeras denna längst in i monteringsdonet 13 och detta skjuts med styrande passning upp på änden 11 av det aktuella röret 2, som kapats till önskad ...wmwv-wm-mrv,m,-,,-nm,.,,,......, ,,. ,, .m...mw-nww-w-vmn--->»fmv~..w..,--V." ., v, -,._.,v-.w-ﬂ-fnr-»w-wn-f-v-mn-wrf-»mf-m...._._.- . . ...f.-,,.-~,.,.-~»mmwmmmvvfnw~w>--~~ - > 516 19 0 šïï* - *ïš - f* längd. Den inre cylinderdelen 25 värms upp inifrån med hjälp av exempelvis gasolbrännaren 32 och värmen från hylsan 30 strålar mot polyetenrörets inneryta och mot rörkopplingsdelen.When mounting the pipe coupling part 12, this is placed at the far end of the mounting device 13 and this is pushed with a guiding fit onto the end 11 of the current pipe 2, which is cut to the desired ... wmwv-wm-mrv, m, - ,, - nm ,. ,,, ......, ,,. ,, .m ... mw-nww-w-vmn ---> »fmv ~ ..w .., - V."., v, -, ._., v-.w- ﬂ- fnr - »w-wn-fv-mn-wrf-» mf-m ...._._.-.. ... f .- ,, .- ~,., .- ~ »mmwmmmvvfnw ~ w> - The inner cylinder part 25 is heated from the inside by means of, for example, the gas burner 32 and the heat from the sleeve 30 radiates towards the inner surface of the polyethylene pipe and towards the pipe coupling part.

Såsom närmare visas i fig. 5 uppvärms under monteringen av rörkopplingsdelen 12 materialet på rörändens insida och det tunna partiet av rörkopplingsdelen 12 värms upp till den lämp- liga temperaturen. Tack vare den fjäderkraft som monterings- donet 13 påverkas av dras sedan den spetsfasade rörkopplings- delen 12 automatiskt och/eller med hjälp av montören in i röret 2 då plasten blir tillräckligt mjuk. När anordningen kallnat fasthålles rörkopplingsdelen 12 med mycket kraftigt grepp i polyetenröret beroende på skillnaden i värmeutvidgningskoef- ficienterna för polyeten och stål.As shown in more detail in Fig. 5, during the assembly of the pipe coupling part 12, the material on the inside of the pipe end is heated and the thin portion of the pipe coupling part 12 is heated to the appropriate temperature. Thanks to the spring force by which the mounting member 13 is actuated, the pointed-phase pipe coupling part 12 is then pulled automatically and / or with the aid of the fitter into the pipe 2 when the plastic becomes sufficiently soft. When the device has cooled down, the pipe coupling part 12 is held with very strong grip in the polyethylene pipe due to the difference in the coefficients of thermal expansion of polyethylene and steel.

Det material som rörkopplingsdelen 12 tränger undan under mon- teringsförfarandet skärs bort av hålsågen 31, som sitter längst fram på monteringsdonet 13 efter det att polyetenmaterialet kallnat något, varvid hålsågen 31 roteras fram och åter sam- tidigt som monteringsdonet dras ut. Detta förfaringssätt inne- bär ett säkerställande av att överskottsmaterialet alltid av- lägsnas. Den hållfasthetsminskning man då får hos röränden kan kompenseras genom att i rören med valfri längd använda material med större godstjocklek.The material that the pipe coupling part 12 displaces during the mounting process is cut off by the hole saw 31, which is located at the front of the mounting device 13 after the polyethylene material has cooled slightly, whereby the hole saw 31 is rotated back and forth at the same time as the mounting device is pulled out. This procedure means ensuring that the excess material is always removed. The reduction in strength that is then obtained at the pipe end can be compensated by using materials with a greater wall thickness in the pipes of any length.

Såsom närmare framgår av fig. 7 sätts sedan rundflänsen 21, som är avsedd att samverka med ytterhuset 6, fast på rör- kopplingsdelen 12 och intilliggande rörparti och låses till rörkopplingsdelen med den kraftupptagande metallringen 22 och spårringen 23. Röret 2 är nu klart att sammanfogas med ett in- tilliggande, andra rör 3 för bildande av den rörskarv 1, som visas i fig. 1. Härvid' skjuts nu rörkopplingsdelens 12 fria hylsparti 17 in och tåtar mot en tätning 35 i form av en O- ring, som är anordnad i ett inåt vettande spår 36 i ett skarv- organ 37 i form av en metallhylsa 38, som är fastkrympt eller fastpressad i anslutningsdelen 5 i den angränsande, fria rör- --,.4f.,.,.,.---m-.,”.--.--f. . ., ,. _, , . n.,H.-i,.vv~,,..,..,.,.ﬂ-".-~,ﬂ--~.-..WW-fi -- - -v k- .-=.,..f.fy~mmw-w=ww;v--f-m~-ys. ..~.~.-,,-, -Wwwf--wwwwvrfrw-.,-,..~_-f ~ - 516 19 0 §ïï= - “ZZ - f* . - ø ; u o v . ø u; änden 39 av röret 3.As can be seen in more detail from Fig. 7, the round flange 21, which is intended to cooperate with the outer housing 6, is then fastened to the pipe coupling part 12 and adjacent pipe section and locked to the pipe coupling part with the force-absorbing metal ring 22 and the groove ring 23. The pipe 2 is now ready to be joined with an adjacent, second pipe 3 for forming the pipe joint 1, shown in Fig. 1. In this case, the free sleeve portion 17 of the pipe coupling part 12 is now pushed in and abuts against a seal 35 in the form of an O-ring, which is arranged in an inwardly facing groove 36 in a splice member 37 in the form of a metal sleeve 38, which is crimped or pressed into the connecting part 5 in the adjacent, free pipe - -, 4f.,.,., .--- m -., ”. - .-- f. . .,,. _,,. n., H.-i, .vv ~ ,, .., ..,.,. ﬂ - ".- ~, ﬂ-- ~ .- .. WW-fi - - -v k- .- = ., .. f.fy ~ mmw-w = ww; v - fm ~ -ys. .. ~. ~ .- ,, -, -Wwwf - wwwwvrfrw -., -, .. ~ _-f ~ - 516 19 0 §ïï = - “ZZ - f *. - ø; uov. Ø u; end 39 of the tube 3.

En skarvning av aktuella rör 2,3 där rörändarna uppvisar an- slutningsdelar 4,5 av ovan beskrivet slag, kan gå till pà följande sätt. Det ena röret 3 har härvid en ytterände 39, som har större innermàtt än själva röret och i vilken skarvorganet 37 i form av metallhylsan 38 är fastkrympt samtidigt som det andra röret 2 efter kapning till önskad längd förses med rör- kopplingsdelen 12, på ovan beskrivet sätt. Sedan placeras tät- ningen 35 i det spår 36 som finns i metallhylsans 38 inre mantelyta och rörkopplingsdelen 12 skjuts in i metallhylsan 38, varefter de bägge halvorna 7,8 som bildar ytterhuset 6, bringas att omsluta anslutningsdelarna 4,2l,5 samtidigt som halvorna 7,8 dras samman i och för färdigställande av rörskarven.A splicing of current pipes 2,3 where the pipe ends have connecting parts 4,5 of the type described above, can take place in the following manner. One pipe 3 here has an outer end 39, which has a larger inner dimension than the pipe itself and in which the splice member 37 in the form of the metal sleeve 38 is crimped at the same time as the other pipe 2 is provided with the pipe coupling part 12 after cutting to the desired length, as described above way. Then the seal 35 is placed in the groove 36 located in the inner jacket surface of the metal sleeve 38 and the pipe coupling part 12 is pushed into the metal sleeve 38, after which the two halves 7,8 forming the outer housing 6 are caused to enclose the connecting parts 4,2l, 5 while the halves 7.8 is contracted in order to complete the pipe joint.

Claims

516 190 Patent claims

An end provided with a pipe coupling part of at least one of the pipe ends of a pipe joint (1) to preferably polyethylene pipes (2,3) where the pipe joint (1) comprises connecting parts (4,5), which. are collapsibly sustainable. by means of an outer housing (6), which pipe coupling part (12) consists of a ledge-shaped sleeve (14) with the same inner diameter along its entire length, which is substantially the same as the inner diameter of the pipe end (11) in question, and at least two from the sleeve ( 14) central portion on both sides of a ledge (15) in each direction extending sleeve portions (16,17), drawn. in that one of the sleeve portions (16) in its free end is formed with a sharp tip in order to enable a predetermination of a predetermined part (19) of the inner circumferential surface of the tube (2) during assembly while said sleeve portion (16) has an outer dimension which is slightly larger than the inner diameter of the pipe edge (11) and that the second sleeve portion (17) has an outer dimension which is substantially equal to the outer diameter of the pipe edge (11) in question and is cooperable with the pipe joint (1). components.

Pipe coupling part according to claim 1, characterized in that the second sleeve portion (17) has an annular groove (22 ') on its outer jacket surface (20) for a force-absorbing metal ring (22) for position-fixing a round flange (21) for co-operation with the outer housing (6) included in the pipe joint (1).

A method of manufacturing an end provided with a pipe coupling part of at least one of the pipe ends included in a pipe joint into preferably polyethylene pipes (2,3) according to claim 1, characterized in that the pipe coupling part (12) and the actual pipe end ( 11) or the pipe coupling part (12) and the pipe end (11) are each heated in a first step and that in a second step one sleeve portion (16) of the pipe coupling part (12) is pushed during cutting into the pipe (2) softened by the heating ) so far that its second, free socket portion (17), which by its larger die uu coon a 516 190 mension forms an abutment surface (14 ') on the coupling part (12), abuts against the end surface of the pipe end (11).

4. Device for manufacturing an end provided with a pipe coupling part! of at least one of the pipe ends included in a pipe joint to preferably polyethylene pipes (2,3) according to claim 1, characterized by a mounting device (13) consisting of an outer and an inner cylinder part (24,25) with a length which exceeds the pipe coupling part (12) 'rises and which cylinder parts (24, 25) are centered relative to each other and are held together by a gable portion (26) at the same time as the cylinder parts (24, 25) are mutually spaced apart to form an annular gap (27), which allows an insertion of the pipe coupling part (12) in the gap (27) for abutment against the end portion (26), which inner cylinder part (25) has a cavity (28) with a heat source (29) for heating from the inside of both the pipe coupling part (12) and the actual pipe end (11) or the pipe coupling part (12) and the pipe end (II) separately, which can be inserted into the gap (27) before the insertion and position fixing of one sleeve portion (16) in the tube (2).

Device according to claim 4, characterized in that the inner cylinder part (25) has a sleeve (30) of a material with good thermal conductivity adhered thereto and a neck saw or knife (31) arranged in connection with its free end with an outer diameter which essentially corresponds to the inner diameter of the current pipe end (11) for cutting off excess material (19) from the inner jacket surface of the pipe (2) after the pipe coupling part (12) has been fastened.

Device according to claim 4, characterized in that the heat source (29) is preferably a gas burner (32), the nozzle of which (40) extends in through an opening (41) in the end portion (26), wherein its gas flame can spread and burn in the cavity (28). 10

Device according to claim 4, characterized in that the open end of the surface-three cylinder part (24) has a tension spring device (33), the free end portion (34) of which can be fastened a piece into the relevant pipe (2) in order to after application of the mounting device (13) to the pipe end (11) but before the insertion of one socket portion (16) of the pipe coupling part (12) into the pipe (2), is in an activated, stretched state. hrs

8. A method of splicing together the ends of preferably polyethylene pipes intended for high medium pressures and where these pipe ends have connecting parts (4,5), in which one pipe (3) has an outer end (39), which has a larger inner force than the pipe itself. and in which a splicing means (37) in the form of a metal sleeve (38) with an inner diameter which substantially corresponds to the outer diameter of the pipes (2,3) is crimped, characterized in that during a first moment during the actual splicing of the pipes (2,3 ) the second pipe (2) is cut to the desired, predetermined length and in its free pipe end (11) a pipe coupling part (12) is applied according to claim 1, which pipe coupling part (12) is then provided with a round flange (21), which is substantially on the end (11) of the pipe (2), and that during a second step a seal (35) is placed in at least one groove (36) in at least the inner jacket surface of the metal sleeve (38), after which the pipe coupling part (12), which forms the second connecting part (4), with psitt free, second sleeve portion (17), having a length exceeding the length of the metal sleeve (38), is pushed into the metal sleeve (38), which is included in the adjacent connecting part (5) and two outer housing (6) forming halves (7,8) are caused to enclose the connecting parts (4,21, 5) at the same time as they are pulled together for holding and position fixing of the connection parts and completion of the pipe joint.