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WO1997039270A1 - Tuyau flexible ondule - Google Patents

Tuyau flexible ondule Download PDF

Info

Publication number
WO1997039270A1
WO1997039270A1 PCT/IT1997/000084 IT9700084W WO9739270A1 WO 1997039270 A1 WO1997039270 A1 WO 1997039270A1 IT 9700084 W IT9700084 W IT 9700084W WO 9739270 A1 WO9739270 A1 WO 9739270A1
Authority
WO
WIPO (PCT)
Prior art keywords
hose
corrugated portion
corrugated
outer crests
depressions
Prior art date
Application number
PCT/IT1997/000084
Other languages
English (en)
Inventor
Palu' Attilio Dal
Original Assignee
Valeo Sicurezza Abitacolo S.P.A.
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 Valeo Sicurezza Abitacolo S.P.A. filed Critical Valeo Sicurezza Abitacolo S.P.A.
Publication of WO1997039270A1 publication Critical patent/WO1997039270A1/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
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L11/11—Hoses, i.e. flexible pipes made of rubber or flexible plastics with corrugated wall

Definitions

  • the present invention relates to a hose for an operating fluid circulating circuit.
  • hoses with reinforcing ribs are known to be used, as described in Italian Patent Application n. TO93U000113 filed on 21/5/93 by the present Applicant.
  • known hoses comprise a number of separate intercalated circumferential ribs in respective planes perpendicularly to the hose axis; and a number of longitudinal ribs inserted between the circumferential ribs to limit elongation of the hose.
  • hoses of the above type involve several drawbacks. Firstly, the longitudinal ribs, and more specifically the arrangement of the longitudinal with respect to the circumferential ribs, result in a variation in the flexural rigidity of the hose along the hose axis, in the sense that the flexibility of the various portions of the hose differs according to the presence or absence of the longitudinal ribs. Secondly, the presence of circumferential ribs extending perpendicular to the flow direction of the operating fluid results in localized load losses, in turbulence due to the fluid striking the circumferential ribs, and inevitably in undesired noise. DISCLOSURE OF INVENTION
  • a hose for an operating fluid circulating circuit comprising at least one corrugated portion; characterized in that said corrugated portion comprises at least one continuous rib extending along a substantially helical path.
  • Figure 1 shows a partially sectioned side view of a hose in accordance with the present invention
  • Figure 2 shows a section along line II-II in Figure 1.
  • Hose l has a longitudinal axis A, and comprises a central corrugated portion 2, and two smooth lateral portions 3.
  • corrugated portion 2 comprises four identical, contiguous, continuous ribs 4 extending along respective substantially helical paths P, so that corrugated portion 2 is in the form of a common screw comprising a thread with a number of starts 4a, 4b, 4c, 4d ( Figures 1 and 2).
  • corrugated portion 2 When undeformed, corrugated portion 2 comprises a number of identical turns 5 with respective equal winding angles ⁇ ; and, in longitudinal half section, corrugated portion 2 comprises an undulated profile defining a succession of alternating, mutually connected outer crests 6 and depressions 7.
  • each outer crest 6 is hollow, substantially U-shaped, and tapers outwards. More specifically, each outer crest 6 comprises a substantially flat intermediate portion 6a parallel to longitudinal axis A; and two substantially flat lateral portions 6b, 6c converging towards each other and towards intermediate portion 6a.
  • Each depression 7 is substantially V-shaped, and comprises a rounded vertex 7a.
  • Corrugated portion 2 is preferably a multilayer portion comprising an inner layer 2a of material resistant to high temperature and pressure of the operating fluid, e.g. polythene or polyethylene; an outer layer 2b of material resistant to corrosion, e.g. nylon; and an intermediate layer 2c connecting inner and outer layers 2a and 2b, and made, for example, of amide material capable of establishing strong chemical bonds with adjacent layers 2a and 2b.
  • an inner layer 2a of material resistant to high temperature and pressure of the operating fluid e.g. polythene or polyethylene
  • an outer layer 2b of material resistant to corrosion e.g. nylon
  • an intermediate layer 2c connecting inner and outer layers 2a and 2b, and made, for example, of amide material capable of establishing strong chemical bonds with adjacent layers 2a and 2b.
  • hose 1 The advantages of hose 1 are as follows. Firstly, by virtue of featuring continuous helical ribs 4, the flexibility of hose 1 is constant along the whole of longitudinal axis A, thus enabling hose 1 to adapt easily to different applications, regardless of the assembly route involved. Secondly, as compared with known solutions, the operating fluid flows more smoothly along hose 1 by being guided along the helical paths P defined by continuous ribs 4, thus reducing load losses and the noise level of the fluid inside hose 1.
  • outer crests 6 and depressions 7 may be shaped differently; hose 1 need not necessarily be a multilayer hose; and corrugated portion 2 may comprise a number of continuous ribs 4 other than that described. In particular, corrugated portion 2 may comprise a single continuous rib 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

Un tuyau flexible sensiblement cylindrique (1) servant à connecter un circuit destiné à la circulation de fluide de travail, notamment de l'eau d'un circuit de refroidissement de moteur, comporte une partie centrale plissée (2) et deux parties latérales lisses (3). La partie plissée (2) comporte quatre nervures (4) continues, identiques et contiguës, s'étendant le long de trajectoires respectives sensiblement hélicoïdales (P), de sorte que elle se présente sous la forme d'une vis ordinaire pourvue d'un filetage à plusieurs filets (4a, 4b, 4c, 4d). Lorsque cette partie plissée (2) ne subit pas de déformation, elle possède un certain nombre de spires identiques (5) de même angle (α) d'enroulement et, dans une demi-section longitudinale, elle présente un profil côtelé délimitant une succession en alternance de crêtes (6) extérieures et de dépressions (7) reliées les unes aux autres.
PCT/IT1997/000084 1996-04-16 1997-04-16 Tuyau flexible ondule WO1997039270A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT96TO000082 IT239716Y1 (it) 1996-04-16 1996-04-16 Tubo flessibile per un circuito di circolazione di un fluido.
ITTO96U000082 1996-04-16

Publications (1)

Publication Number Publication Date
WO1997039270A1 true WO1997039270A1 (fr) 1997-10-23

Family

ID=11414219

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT1997/000084 WO1997039270A1 (fr) 1996-04-16 1997-04-16 Tuyau flexible ondule

Country Status (2)

Country Link
IT (1) IT239716Y1 (fr)
WO (1) WO1997039270A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1362890A1 (fr) 2002-05-07 2003-11-19 EMS-Chemie AG Tube polymère ondulé ou conduit à variation de longueur réduite
JP2015227716A (ja) * 2014-06-03 2015-12-17 タイガースポリマー株式会社 吸気系用ゴム製ジャバラホース
JP2023122015A (ja) * 2022-02-22 2023-09-01 積水化学工業株式会社 伸縮波形管及びこれを備えた複合管
CN118418474A (zh) * 2024-07-03 2024-08-02 康泰塑胶科技股份有限公司 一种大口径管材及其制备方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0474449A2 (fr) * 1990-09-01 1992-03-11 Andrew John Whitworth, And Dorothy Whitworth, In Partnership As Grange Tubes Perfectionnement aux tubes en matière plastique
EP0486962A1 (fr) * 1990-11-19 1992-05-27 GEWISS S.p.A. Manchon flexible à usage multiple
US5191916A (en) * 1988-11-26 1993-03-09 Shiro Kanao Pressure-resistant helical corrugated pipe

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5191916A (en) * 1988-11-26 1993-03-09 Shiro Kanao Pressure-resistant helical corrugated pipe
EP0474449A2 (fr) * 1990-09-01 1992-03-11 Andrew John Whitworth, And Dorothy Whitworth, In Partnership As Grange Tubes Perfectionnement aux tubes en matière plastique
EP0486962A1 (fr) * 1990-11-19 1992-05-27 GEWISS S.p.A. Manchon flexible à usage multiple

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1362890A1 (fr) 2002-05-07 2003-11-19 EMS-Chemie AG Tube polymère ondulé ou conduit à variation de longueur réduite
US7132141B2 (en) 2002-05-07 2006-11-07 Ems-Chemie Ag Multilayer polymer hose line or tubing having reduced length variations
JP2015227716A (ja) * 2014-06-03 2015-12-17 タイガースポリマー株式会社 吸気系用ゴム製ジャバラホース
JP2023122015A (ja) * 2022-02-22 2023-09-01 積水化学工業株式会社 伸縮波形管及びこれを備えた複合管
CN118418474A (zh) * 2024-07-03 2024-08-02 康泰塑胶科技股份有限公司 一种大口径管材及其制备方法

Also Published As

Publication number Publication date
IT239716Y1 (it) 2001-03-13
ITTO960082U1 (it) 1997-10-16

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