JP2006046379A - Bellows tube hose - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bellows tube hose capable of suppressing the occurrence of flowing sound and vibration by a turbulent flow itself or due to the resonance of a tube by suppressing the occurrence of the turbulent flow in transporting a fluid. <P>SOLUTION: In this bellows tube hose, a metal bellows tube 18 formed by axially arranging waveform parts 30 having crest parts 26 on the radial outer side and bottom parts 28 on the radial inner side continuously with each other is formed as the innermost layer and the inside spaces 32 of the waveform parts 30 communicate with the inner spaces of the bellows tube 18 allowing a fluid to flow therein. A step F is formed between the bottom part 28a and the bottom part 2a of the bottom parts 28 adjacent to each other so that the start end part X<SB>2</SB>of the downstream side bottom part 28a is positioned on the radial outer side of the terminal end part X<SB>1</SB>of the upstream side bottom part 28a, and each bottom part 28a is so formed as to approach the axis of the bellows tube 18 as it advances from the upstream side to the downstream side. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bellows tube hose that can be suitably used for automobile fuel transportation, refrigerant transportation, transportation of battery fuel such as hydrogen gas used in fuel cells, and the like, and in particular, means for suppressing flow noise during fluid transportation. It relates to what has the characteristics.

Conventional rubber hoses with excellent vibration absorption and assembly properties, such as automobile fuel (gasoline and other engine fuel) transport hoses and refrigerant transport hoses, such as FKM (fluoro rubber) with excellent permeation resistance NBR / PVC (a blend of acrylonitrile butadiene rubber and polyvinyl chloride) has been used, but in recent years, permeation regulations for automobile fuels have become stricter from the viewpoint of global environmental conservation, and the regulations will be further strengthened in the future. Is expected.
Accordingly, the fuel transport hose and the refrigerant transport hose are required to have higher permeation resistance.

In addition, in a transport hose such as hydrogen gas used in a fuel cell, extremely high permeation resistance is required for the transport fluid.
In response to these requirements, it is difficult to satisfy the required performance with a hose composed only of an organic material such as rubber or resin.

  For this reason, a bellows hose having a metal bellows tube (substantially no permeation) with extremely high permeation resistance to the transport fluid at least in the innermost layer has been studied.

However, when the present inventors carried out fluid transportation using the bellows tube hose, it was found that flow noise and vibration were generated particularly when the gas was carried at a high flow rate.
When the cause was investigated, the inner surface of the bellows tube has an uneven shape, so that turbulence is likely to occur due to the unevenness during fluid transportation, and the flow sound is generated by the turbulence itself or by resonance of the tube itself based on the turbulence. It has been found that it occurs or vibrates.

That is, as shown in FIG. 3, the metal bellows tube 200 has a shape in which a corrugated portion 206 having a radially outer crest 202 and an inner trough 204 is continuous in the axial direction, and the inner surface thereof has an uneven shape. Therefore, when fluid flows through the metal bellows tube 200, turbulent flow is generated due to the uneven shape, and flow noise and vibration are generated due to the turbulent flow.
Although the above has described problems with a bellows tube made of a metal bellows tube, such a problem also occurs in a hose having a resin bellows tube.
In FIG. 3, 202 a represents the top of the peak portion 202, and 204 a represents the bottom of the valley portion 204.

  Such bellows tube hoses have been disclosed in, for example, Patent Document 1 and Patent Document 2 below, but these patent documents point out the occurrence of turbulent flow, flow noise, and vibration, which are the problems of the present invention. There is also no disclosure of the solution of the present invention for solving this problem.

JP-A-11-159616 JP 2002-195474 A

  The present invention is based on the above circumstances, and suppresses the generation of turbulent flow during fluid transportation, and can suppress the generation of flow noise and vibration caused by the turbulent flow itself or the resonance of the tube itself. It was made for the purpose of providing a hose.

  Thus, according to the first aspect of the present invention, at least the innermost layer has a bellows tube formed by connecting a corrugated portion having a radially outer crest and an inner trough in the axial direction, and an inner space of the corrugated portion. Is a bellows tube hose forming a space communicating with the internal space of the bellows tube through which the fluid flows, between the bottoms of the adjacent valleys and downstream of the bottom end of the upstream side of the transport fluid A step is provided so that a starting end portion of the bottom portion is located on the radially outer side, and the shape approaches the axis of the bellows tube as each bottom portion proceeds from the upstream side to the downstream side.

Effects and effects of the invention

  As described above, according to the present invention, between the bottoms of the adjacent valleys, in detail, the start end of the bottom of the downstream side is located radially outside the end of the bottom of the upstream of the transport fluid. In this way, the shape of the bottom portion approaches the axis of the bellows tube as it proceeds from the upstream side to the downstream side. It is possible to suppress the occurrence of turbulent flow by hitting the bottom of the part.

Moreover, since the bottom portion has a shape that gradually approaches the axial center side of the bellows tube from the upstream side toward the downstream side, the fluid can smoothly flow along the bottom portion during fluid transportation.
Thereby, generation | occurrence | production of the turbulent flow at the time of fluid transportation and the generation | occurrence | production of the flow sound and vibration by resonance of the pipe | tube itself can be suppressed effectively.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, 10 is a bellows tube hose, and 12 is a joint fitting attached to the end thereof.
The joint metal fitting 12 has a pipe-like insert metal fitting 14 and a sleeve-like socket metal fitting 16, and the socket metal fitting 16 is caulked in the diameter reducing direction so that they are attached to the end portion of the bellows tube hose 10. It is fixed.

  The bellows tube hose 10 has a metal bellows tube 18 in the innermost layer, an intermediate rubber layer 20 serving as a filler on the outer peripheral side of the metal bellows tube 18, and a reinforcing layer 22 on the outer peripheral side and an outer rubber as the outermost layer. The layer 24 is laminated.

As shown in FIG. 2A, the metal bellows tube 18 has a shape in which a corrugated portion (unit corrugated portion) 30 having a radially outer crest 26 and an inner trough 28 is connected in the axial direction. ing.
In the figure, 26a represents the top of the peak 26, and 28a represents the bottom of the valley 28.

  As shown in FIG. 2, the inner space 32 of the corrugated portion 30 of the metal bellows tube 18 is an internal space of the metal bellows tube 18 through which fluid flows through the opening 34 between the adjacent valley portions 28 and 28. It has a communication space.

In this embodiment, as shown in FIG. 2 (B), between the bottom portions 28a and 28a of the adjacent valley portions 28, the bottom portion on the upstream side of the transport fluid (the transport fluid is indicated by an arrow Q in FIG. 2 (A)). to the terminal end X ₁ of the flows in the direction) indicated, step F is provided so as beginning X ₂ on the downstream side of the bottom portion 28a is located radially outward.

And each bottom portion 28a is formed into towards from the beginning X ₂ at the end X _1, i.e. a smooth curved shape approaching toward the axis of the corrugated metal tube 18 as from the upstream side advances to the downstream side.
Here, the bottom portion 28a may be inclined instead of such a curved shape.
As shown in FIG. 2B, a pair of root portions of each corrugated portion 30 has an arc shape with radii R ₁ and R ₂ .

  In the present embodiment, the bellows tube hose 10 has an inner diameter of φ14 mm, the corrugated portion 30 has a height (radial height) of 4 mm, an outer diameter of φ27 mm, and the intermediate rubber layer 20 has a thickness of 1 mm. Further, the step F is 0.7 mm.

As described above, in the present embodiment, such as, beginning X ₂ of the bottom 28a located on the downstream side in the flow direction of the transport fluid, step F radially outward with respect to the terminal end X ₁ of the bottom 28a located on the upstream side Therefore, when the fluid is transported, it can be suppressed that the fluid hits the bottom portion 28a of each corrugated portion 30 and causes turbulent flow.

Moreover, since the bottom portion 28a has a curved shape or an inclined shape that gradually approaches the axial center side of the metal bellows tube 18 from the upstream side toward the downstream side, the transport fluid smoothly flows along the inner surface of the bottom portion 28a. be able to.
Thereby, generation | occurrence | production of the turbulent flow at the time of fluid transportation and generation | occurrence | production of the flow sound and vibration by resonance of the pipe | tube itself can be suppressed effectively.

Although the embodiment of the present invention has been described in detail above, this is merely an example.
For example, the corrugated portions in the bellows tube may be independent from each other in the axial direction, or may be continuous in a spiral shape, and the present invention is directed to a hose having a bellows tube made of a resin or other material. Alternatively, the present invention can be applied to a hose composed of a single bellows tube, and the present invention can be configured in various forms without departing from the spirit thereof.

It is a figure of the bellows tube hose of one Embodiment of this invention. It is a figure of the principal part of the metal bellows pipe of FIG. It is a figure of the conventional metal bellows tube.

Explanation of symbols

10 bellows tube hose 18 corrugated metal tube 26 crest 28 valleys 28a bottom 30 corrugations 32 interior space X ₁ termination section X ₂ beginning
F steps

Claims (1)

A corrugated tube having a corrugated portion having a radially outer crest and an inner trough connected in the axial direction is provided at least in the innermost layer, and the inner space of the corrugated portion is the interior of the bellows tube through which fluid flows. In the bellows tube hose that forms a space communicating with the space,
Between the bottoms of the adjacent valleys, a step is provided so that the downstream end of the upstream side of the transport fluid is positioned radially outward with respect to the end of the bottom of the upstream side of the transport fluid, and each bottom is upstream A bellows tube hose characterized by having a shape that approaches the axis of the bellows tube as it goes downstream.

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