EP1222422A1 - Dispositif pour la reduction des bruits transmis par conduction dans des conduites - Google Patents

Dispositif pour la reduction des bruits transmis par conduction dans des conduites

Info

Publication number
EP1222422A1
EP1222422A1 EP00965711A EP00965711A EP1222422A1 EP 1222422 A1 EP1222422 A1 EP 1222422A1 EP 00965711 A EP00965711 A EP 00965711A EP 00965711 A EP00965711 A EP 00965711A EP 1222422 A1 EP1222422 A1 EP 1222422A1
Authority
EP
European Patent Office
Prior art keywords
arrangement
particular according
intermediate medium
line
connection
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.)
Withdrawn
Application number
EP00965711A
Other languages
German (de)
English (en)
Inventor
Andreas Bootz
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.)
Luethin Heinz
Dobson Industries Corp
Original Assignee
Luethin Heinz
Dobson Industries Corp
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 Luethin Heinz, Dobson Industries Corp filed Critical Luethin Heinz
Priority to EP00965711A priority Critical patent/EP1222422A1/fr
Publication of EP1222422A1 publication Critical patent/EP1222422A1/fr
Withdrawn legal-status Critical Current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
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/02—Energy absorbers; Noise absorbers
    • F16L55/033—Noise absorbers
    • F16L55/0337—Noise absorbers by means of a flexible connection
    • 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
    • F16L27/00—Adjustable joints; Joints allowing movement
    • F16L27/10—Adjustable joints; Joints allowing movement comprising a flexible connection only
    • F16L27/1021—Adjustable joints; Joints allowing movement comprising a flexible connection only comprising an intermediate resilient element, e.g. a ring

Definitions

  • the present invention relates to an arrangement for reducing structure-borne noise transmission in a line carrying a fluid medium, and in particular to a device for reducing structure-borne noise transmission in hydraulic systems or hydraulic lines at high pressures.
  • this problem is to be described using hydraulic systems. Due to the non-uniform flow rate, for example of positive displacement pumps in hydraulic systems and the resulting pressure pulsations, the walls of a hydraulic system are excited to vibrate. This results in the emission of airborne noise and thus in a noisy environment. In hydraulic systems, for example, the walls of pipelines are excited to vibrate by the pulsation of the liquid flow. Vibrations that occur in the hydraulic pump itself are also transmitted. In order to avoid the sound radiation in downstream systems, such as in a hydraulic cylinder or generally with a consumer or the connecting pipelines, the flow pulsation must be smoothed.
  • pulsation reducer which is designed as an expansion hose or as a storage element.
  • pulsation reducers such as, for example, expansion hoses
  • Adaptive passive and active pulsation dampers with a storage element are known from EP 679 832 or EP 633 400 known.
  • the installation location should be as close as possible to the pulsation source (hydraulic pump). If this measure smoothes the liquid pulsation, the walls in downstream systems are no longer excited to vibrate. However, the vibrations that occur in the pipeline or in the hydraulic pump are transmitted across the pulsation reducer, provided that this does not ensure adequate insulation of the structure-borne noise transmission.
  • expansion hoses are used as a pulsation reducer with low structure-borne noise transmission in hydraulic systems with high operating pressure.
  • these have inserts made of plastic fabric that are tensioned under high operating pressure and transmit structure-borne noise to a limited extent. This spreads in downstream systems and thus leads to residual vibrations and to the emission of airborne sound throughout the structure.
  • insulation of the structure-borne noise transmission must also be provided.
  • a damping element is described, for example, in US Pat. No. 3,936,078 for the insulation of such sound transmissions, elastic material being provided between two specially designed connection ends in a line interruption. Further analog damping elements are described in DE 35 15 768, EP 575 727 and US Pat. No. 4,045,057. Damping arrangements are known from US Pat. No. 5,639,127 and EP 0 615 595, particularly suitable for exhaust systems of motor vehicles.
  • DE 35 15 768 describes the connection of two pipe ends with an arrangement for preventing sound transmission.
  • the elastic intermediate medium arranged between the two pipe ends is pressurized in the axial direction to achieve an adequate seal. This permanent pre Tension is disadvantageous because it leads to stiffening of the elastic intermediate material.
  • the object of the present invention is to create an arrangement for reducing vibration or structure-borne sound wave transmission in lines carrying fluid media, which is particularly suitable in hydraulic systems with high operating or working pressures.
  • the object is achieved by means of an arrangement according to the wording according to claim 1.
  • a separation area which interrupts the line carrying the fluid medium, comprising a connection arrangement for connecting the two corresponding connection ends of the separated line.
  • This separation area consists at least of an intermediate medium with a sealed line section connecting the two lines.
  • At least one of the connection ends has a projection with nose-like areas or circumferential lugs protruding at least on one side, preferably on both sides, in the line direction.
  • the intermediate medium preferably has a lower density than the line material in order to achieve a damping of the sound transmission.
  • an inelastic intermediate ring be arranged between the connection ends of the interrupted line. net, which preferably has a higher density than the intermediate medium.
  • the intermediate medium consists of a soft or elastic material, which preferably completely envelops or encloses the two connection ends on the outside.
  • connection ends of the interrupted line preferably both connection ends, each have a projection, each in the end region the overhanging, nose-like areas. This creates a surface pressure in the radial direction at the separating surfaces of the intermediate medium and the connection ends when the line is pressurized by the fluid medium, which supports the sealing function.
  • the arrangement proposed according to the invention is particularly suitable for the reduction of vibration or sound wave transmissions in hydraulic systems with high pressures.
  • FIG. 1 shows a hydraulic system in which measures for reducing pressure pulsations and structure-borne noise transmission are implemented.
  • the hydraulic medium such as hydraulic oil
  • the hydraulic pump 31 Due to the non-uniform flow rate of the hydraulic pump and the resulting pressure pulsations, the walls of the hydraulic system are excited to vibrate. This results in the emission of airborne noise and thus in a noisy environment.
  • the walls of the pipeline 33 are excited to vibrate by the pulsation of the liquid flow. Furthermore, vibrations that arise in the hydraulic pump 31 itself are transmitted.
  • downstream systems such as for example the synchronous cylinder 43 shown in FIG.
  • the delivery flow pulsation must be smoothed out.
  • a pulsation reducer 35 which is designed, for example, as an expansion hose or as a storage element, as explained in more detail at the beginning with reference to various European patent specifications.
  • the vibrations that are in of the pipeline 33 or in the hydraulic pump are transmitted over the pulsation reducer 35, provided that this does not ensure adequate insulation of the structure-borne noise transmission.
  • the pulsation reducers known from the prior art are not suitable for adequately damping structure-borne noise, with which this is transmitted to pipeline 37 to a limited extent. This spreads in the downstream system and thus leads to residual vibrations and to the emission of airborne sound throughout the structure. To reduce the noise
  • a device developed for the purpose of structure-borne sound insulation is shown in longitudinal section.
  • the structure-borne sound insulation is essentially a perfect one
  • the tube 1 transmits the vibrations generated at the pump 31 (structure-borne noise).
  • the intermediate medium 3 preferably has a very much lower density than the pipe material. Due to the difference in density of the tube 1 and the intermediate medium 3, the incoming sound waves are largely reflected at their interface and only passed on to a small extent through the intermediate medium 3. In addition, there is the damping property (absorption) of the intermediate medium, which is preferably to be made soft, whereby additional sound energy is dissipated.
  • the interface between the intermediate medium 3 and the tube 6 is used to reflect sound waves that are transmitted in the intermediate medium.
  • the pipe ends 7 and 8 are designed as shown.
  • the elastic intermediate medium and the two pipe ends 23 and 24, each with the peripheral projections 25 and 26, are connected to one another in a form-fitting manner by screwing an outer casing 2 around a cover 5. Due to the pipe ends with the circumferential pipe ends and the circumferential lugs protruding on both ends of the projections, there is an increased surface pressure of the intermediate medium in the area of the protruding lugs 9, 10, 11 and 12, if the line and thus the intermediate medium is pressurized by the flowing fluid medium.
  • This surface pressure can be further increased over the entire distance that separates the two pipe ends from one another, for example by providing an inelastic intermediate ring 4, which can also be made of metal, for example.
  • an inelastic intermediate ring 4 which can also be made of metal, for example.
  • the level of structure-borne sound insulation can depend to a large extent on the insulation of the liquid pulsations, since poor insulation of the liquid pulsation can lead to structure-borne noise in the system downstream of the structure-borne noise insulation.
  • FIG. 3 shows in longitudinal section a further embodiment variant of a decoupling element according to the invention, arranged between the tube ends 23 and 24 of the two tube sections 1 and 6.
  • the end projections on the two tube ends are soldered by collar-like decoupling rings 71 or 73 are formed, each of which in turn has the terminal, circumferential lugs 9 and 10 or 11 and 12 projecting on both sides in the longitudinal direction.
  • the two ring-like bodies 71 and 73 can each be pushed over a pipe end 23 or 24 until, depending on the inside, annular stops 72 and 74 abut the pipe ends ,
  • the two ring-like bodies 71 and 73 can be fastened, for example, by means of soldering on the pipe ends.
  • the two pipe ends or ring-like bodies 71 and 73 soldered thereon are overmolded by an elastomer material 3, so that a composite part consisting of the pipe ends 23 and 24, ring-like bodies 71 and 73 and the elastomer 3 is formed.
  • an outer casing or sleeve 2 is placed over one of the two pipe ends. and a disk-like ring element 75 over the other tube end.
  • the sleeve 2 is prefabricated such that it has a circumferential shoulder 77 in the region where the disk 75 is pushed on, up to which the disk can be inserted into the sleeve 2.
  • a protruding collar 79 of the sleeve 2 is then knurled, so that the disk 75 is positively connected to the sleeve 2.
  • the variant according to FIG. 4 is very similar to that shown in FIG. 3.
  • a circumferential taper 81 in the diameter of the sleeve is provided in the sleeve 2.
  • This taper has the following background: Due to the pressure build-up due to a fluid medium in the pipeline, the elastomer 3 flows in the radial direction. This leads to a displacement of the elastomer in the axial direction in the annular space between the sleeve 2 and the decoupling ring bodies 71 and 73.
  • the sleeve is preferably provided with rounded edges 76 facing the elastomer at the annular gaps between the tube walls 1 or 6 and the sleeve 2.
  • FIG. 5 in turn shows further embodiment variants, similar to those shown in FIGS. 3 and 4.
  • the ring bodies 71 and 73 show circumferential ring grooves in FIG. 5 83 and 85.
  • This shape additionally reduces the relative movement in the ring gaps between ring bodies 71 and 73 and the inner wall of the sleeve 2 in the axial direction. Furthermore, this also creates additional sealing surfaces on which an increased surface pressure arises when the pipe ends are moved axially.
  • FIG. 6 shows a further embodiment variant of a decoupling device which is used in a pump housing
  • the complete separation of the metallic surfaces is achieved.
  • the end of the tube 50 in turn has a projection, which Analogously to the variants in FIGS. 3-5, a disk 54 is formed, which is firmly connected to the tube 50 by a welded or soldered connection.
  • a disk 54 is formed, which is firmly connected to the tube 50 by a welded or soldered connection.
  • This design of the tube end can be carried out better in terms of production technology.
  • the sealing function is also supported here by the design of the annular lugs 58 on the two end faces of the disk 54. If the line 20 carrying the fluid is pressurized, the rubber-elastic intermediate medium, formed by a disk-shaped element 57, is displaced radially outwards.
  • the intermediate medium Due to the nose-shaped design of the disk 54, the intermediate medium is prevented from flowing radially, and a surface pressure is built up on the annular nose, which supports the sealing function.
  • the intermediate medium area 56 also designed as an annular element 56, which is axially pressed by the deformation of the ring 57 and whose flow movement in the radial direction (towards the pipe axis), which is possible due to this pressing, is also additionally hampered by the nose-shaped design of the disks , This also leads to an increased surface pressure of the intermediate medium on the disk-shaped projection 54 and a nut 55, which supports the sealing function.
  • Tube 50 or the structural vibrations transmitted through the flange 51 are reflected (reflection at the open end).
  • the same criteria apply to the intermediate medium as to the elements shown in FIGS. 2-5, so that the absorption of the sound waves by the soft intermediate medium can also be effected.
  • the fixed arrangement of the intermediate medium is carried out by the nut 55, which is screwed into a socket 53.
  • the rings 56 and 57 made from the intermediate medium described um, are consequently axially displaced by the nut 55 in the pipe axis direction until it is finally positioned or, if necessary, slightly compressed. It would also be conceivable that the two rings 56 and 57 represent a common component, for example in the form of a bead which is vulcanized onto it.
  • the bushing 53 is screwed into the flange 51, the ring 52 serving to seal this screw connection. This is state of the art for screwing pipes in the steering gear and pump of a power steering.
  • FIG. 7 shows a graphic for demonstrating the function of a decoupling element, for example shown in FIG. 2.
  • Two measurements are shown, which were determined in a system which corresponds to that in FIG. 1. At two points in the piping system, the acceleration of the was measured using piezoelectric accelerometers
  • Pipe wall measured perpendicular to the pipe axis, ie in the radial direction of the pipe cross-section.
  • the first measuring point is in the pipe section 33 and the signal ai was recorded here.
  • the second measuring point lies in the pipe section 40, and here the signal a 2 was recorded.
  • the dotted line 61 shows the transfer function of an expansion hose 35 without a decoupling element 39 connected downstream.
  • the transfer function is even higher than 1 (or 0 dB) and consequently the vibrations in the pipeline section 40 are stronger than in section 33.
  • the solid curve 63 shows the same transfer function for the system in which the decoupling element 39 was connected downstream of the expansion hose 35. There is a significant reduction in pipe vibration in section 40 (ai) compared to section 33 (a 2 ).
  • FIGS. 2-6 are of course only examples to illustrate the present invention.
  • the interrupted pipeline can also be a plastic line, although the problem of structure-borne noise transmission in plastic tubes can be less serious.
  • the design of the device when using, for example, reinforced plastic tubes is similar to that shown in FIGS. 2-6, in that an intermediate medium is again chosen, the density of which is lower than the density of the polymer material from which the pipeline is produced is.
  • the sheath or the annular connection socket 53 which surrounds the device on the outside does not necessarily have to be made of metal, but a reinforced polymer material can also be used for this purpose.
  • the sleeve or nut can be used when mounting the intermediate medium as shown in FIGS. 3-5 be arranged in a pressing manner, for example by means of shrinking, pressing or injection molding technology.
  • screws for example, rivets can also be used, as can other assembly elements.
  • an intermediate medium particularly suitable as an intermediate medium are elastomers or rubber-elastic polymer materials, which can be arranged by means of extrusion, injection molding or casting technology or by means of vulcanization to form the connection arrangement for connecting the two connection ends of the separate line.
  • Suitable damping materials are certainly NBR rubber, silicones, polyurethanes and other thermoplastic or thermoset elastomers, but it is clear that the material used should have the required lower density criterion and must be flexible. In the event of series production, many other factors, such as Temperature and abrasion resistance play a role, as does the use of the simplest manufacturing technology.
  • two or more intermediate rings can also be arranged instead of an intermediate ring, it also being conceivable, of course, to have a design without an intermediate ring, as shown, for example, in FIGS. 3-6.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pipe Accessories (AREA)

Abstract

L'invention concerne un dispositif pour la réduction des bruits transmis par conduction dans une conduite (1, 6) conduisant un milieu fluide. Selon l'invention, la conduite (1, 6) conduisant le milieu fluide comporte une zone de séparation présentant un système de raccord servant à relier les deux extrémités de connexion (13, 16, 23, 24) de la conduite séparée. Ce système de raccord est constitué d'un milieu intermédiaire (3) pourvu d'un segment de conduite étanche (20) reliant les deux conduites. Les deux extrémités de connexion (13, 16, 23, 24) de la conduite (1, 6) conduisant le milieu fluide présentent chacune une collerette (7, 8) pourvue, à l'extrémité dans le sens de la conduite, de zones en forme de nez (9, 10, 11, 12), faisant saillie au moins d'un côté et, de préférence, des deux côtés.
EP00965711A 1999-10-22 2000-10-17 Dispositif pour la reduction des bruits transmis par conduction dans des conduites Withdrawn EP1222422A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00965711A EP1222422A1 (fr) 1999-10-22 2000-10-17 Dispositif pour la reduction des bruits transmis par conduction dans des conduites

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP99121112 1999-10-22
EP99121112A EP1094267A1 (fr) 1999-10-22 1999-10-22 Dispositif pour atténuer le son structurel dans tuyauteries
PCT/CH2000/000557 WO2001031248A1 (fr) 1999-10-22 2000-10-17 Dispositif pour la reduction des bruits transmis par conduction dans des conduites
EP00965711A EP1222422A1 (fr) 1999-10-22 2000-10-17 Dispositif pour la reduction des bruits transmis par conduction dans des conduites

Publications (1)

Publication Number Publication Date
EP1222422A1 true EP1222422A1 (fr) 2002-07-17

Family

ID=8239262

Family Applications (2)

Application Number Title Priority Date Filing Date
EP99121112A Withdrawn EP1094267A1 (fr) 1999-10-22 1999-10-22 Dispositif pour atténuer le son structurel dans tuyauteries
EP00965711A Withdrawn EP1222422A1 (fr) 1999-10-22 2000-10-17 Dispositif pour la reduction des bruits transmis par conduction dans des conduites

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP99121112A Withdrawn EP1094267A1 (fr) 1999-10-22 1999-10-22 Dispositif pour atténuer le son structurel dans tuyauteries

Country Status (3)

Country Link
EP (2) EP1094267A1 (fr)
AU (1) AU7638100A (fr)
WO (1) WO2001031248A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007026842A1 (de) 2007-06-06 2008-12-11 Endress + Hauser Wetzer Gmbh + Co Kg Vorrichtung zur Bestimmung und/oder Überwachung einer Messgröße
DE202014102958U1 (de) * 2014-06-30 2015-10-01 Rehau Ag + Co Rohrformteil
JP7135601B2 (ja) * 2017-10-18 2022-09-13 株式会社デンソー ジョイント
WO2019077940A1 (fr) * 2017-10-18 2019-04-25 株式会社デンソー Raccord
EP3670991B1 (fr) * 2018-12-17 2023-07-12 Bombardier Inc. Système de couplage de conduit

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR957514A (fr) * 1950-02-23
US2504634A (en) * 1941-11-17 1950-04-18 Pirelli Sound and vibrationproof joint for metal tubing
DE2808135A1 (de) * 1978-02-25 1979-08-30 Karlsruhe Augsburg Iweka Kompensator
DE3515768A1 (de) * 1985-05-02 1986-11-06 Alfred Teves Gmbh, 6000 Frankfurt Hochdruckdichte, metallische rohrverbindung
JPS62151640A (ja) * 1985-12-26 1987-07-06 Toshiba Corp 制振装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0131248A1 *

Also Published As

Publication number Publication date
AU7638100A (en) 2001-05-08
WO2001031248A1 (fr) 2001-05-03
EP1094267A1 (fr) 2001-04-25

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