JP2006046378A - 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 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 of the waveform parts 30 communicate with the inside of the bellows tube 18 allowing a fluid to flow therein. The waveform parts 30 are tilted in the axial direction and in the reverse direction to a transportation direction Q for the fluid. <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. 4, 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 its inner surface 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. 4, 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. In the bellows tube hose forming a space communicating with the internal space of the bellows tube through which the fluid flows, the corrugated portion is inclined in the axial direction of the bellows tube and in the direction opposite to the fluid transport direction. Features.

  According to a second aspect of the present invention, in the first aspect, the shape of the bottom of the valley is flat and straight in the axial direction, and a cylindrical surface that is straight in the axial direction is formed at the bottom of each corrugated portion. It is characterized by being.

  According to a third aspect of the present invention, in any one of the first and second aspects, an inclination angle of the corrugated portion is 30 ° or more and less than 90 °.

Effects and effects of the invention

  As described above, according to the present invention, the corrugated portion of the bellows tube is inclined in the axial direction of the bellows tube and in the direction opposite to the fluid transport direction. It is possible to effectively suppress the occurrence of turbulence caused by the fluid flowing into the inside of the corrugated portion from the opening between the two.

In a second aspect of the present invention, the bottom shape of the valley is flat and straight in the axial direction, and a cylindrical surface having a straight shape in the axial direction is formed at the bottom of each corrugated portion.
By doing so, the fluid can smoothly flow along the cylindrical surface, thereby suppressing the generation of turbulent flow and resonance of the tube itself, thereby further suppressing the generation of flow noise and vibration. It becomes possible.

  Here, the angle of inclination of the corrugated portion can be an angle with respect to the axial direction of the bellows tube that is 30 ° or more and less than 90 ° (Claim 3).

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 FIGS. 2A and 2B, in the present embodiment, the shape of the bottom portion 28a is flat and straight in the axial direction, and straight at the bottom portion 28a of each corrugated portion 30 in the axial direction. A cylindrical surface 32 having a shape is formed.

As clearly shown in FIG. 2B, in this embodiment, each corrugated portion 30 is inclined in the axial direction of the bellows tube 18 and in the direction opposite to the fluid transport direction indicated by the arrow Q in FIG. ing.
Specifically, as shown in (B), a line P connecting the top part 26a of the peak part 26 and the center of the opening part 34 between the adjacent valley parts 28 and 28 is inclined at an inclination angle θ.
Here, the inclination angle θ is an angle of 30 ° or more and less than 90 ° with respect to the axial direction of the bellows tube.
The pair of base portions of the corrugations 30, as shown in (B) is are no arc shape of radius R _1, 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 shape of φ27 mm, and the intermediate rubber layer 20 has a thickness of 1 mm. The inclination angle θ of the corrugated portion 30 is 70 ° (that is, 30 ° with respect to the radial direction).

  As described above, in this embodiment, the corrugated portion 30 in the bellows tube 18 is inclined in the axial direction of the bellows tube 18 and in the direction opposite to the fluid transport direction. It is possible to effectively suppress the occurrence of turbulent flow caused by the fluid flowing into the inside of the corrugated portion 30 from the opening 34 between them.

  Further, in this embodiment, the shape of the bottom portion 28a of the valley portion 28 is flat and straight in the axial direction, and the cylindrical surface 32 having a straight shape in the axial direction is formed at the bottom portion 28a of each corrugated portion 30, As a result, the fluid flows smoothly along the cylindrical surface 32, the generation of turbulence and the resonance of the tube itself are suppressed, and the generation and vibration of flow noise are further suppressed.

In the above embodiment, the axial dimension of the inner space of the peak portion 26 is larger than the axial dimension of the opening portion 34, and each of the cross-sectional Ω shapes has a shape in which the inner space of the peak portion 26 expands with respect to the opening portion 34. Although this is an example where the corrugated portion 30 is configured, the present invention can be applied to bellows tubes in which the corrugated portion 30 has various shapes.
FIG. 3 shows one specific example.

  In this embodiment, the axial dimension of the opening 34 is larger than the inner space of the mountain portion 26, and the bottom portion 28a is not flat and straight, but has a corrugated portion 30 having a corrugated portion 30 that curves downward. This is an example in which the present invention is applied to a tube hose.

  As shown in the figure, also in this embodiment, each corrugated portion 30 has a shape inclined at an angle θ in the axial direction of the bellows tube 18 and in the direction opposite to the fluid transport direction indicated by the arrow Q.

  Even in the bellows tube 18 in which the corrugated portion 30 has such a shape, more specifically, in the hose 10 having such a bellows tube 18 in the innermost layer, the flow noise and vibration during the transportation of the fluid are inclined to each corrugated portion 30. It can suppress well based on.

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 may be applied to a hose having a bellows tube made of resin or other materials, or In addition, the present invention can be applied to a hose composed of a single bellows tube, and can be configured in various modifications without departing from the spirit of the present invention.

It is a figure of the metal bellows tube hose (partially enlarged) which is one Embodiment of this invention. It is a principal part enlarged view of the metal bellows tube in the embodiment. It is a principal part enlarged view of other embodiment of this invention. It is a figure of the conventional metal bellows tube.

Explanation of symbols

10 Bellows tube hose 18 Metal bellows tube 26 Mountain portion 26a Top portion 28 Valley portion 28a Bottom portion 30 Waveform portion 32 Cylindrical surface
Q Fluid transport direction

Claims (3)

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,
The bellows tube hose, wherein the corrugated portion is inclined in the axial direction of the bellows tube and in the direction opposite to the fluid transport direction.   2. The bellows according to claim 1, wherein a shape of a bottom portion of the valley portion is flat and straight in the axial direction, and a cylindrical surface having a straight shape in the axial direction is formed at the bottom portion of each corrugated portion. Tube hose.   The bellows tube hose according to claim 1, wherein an inclination angle of the corrugated portion is 30 ° or more and less than 90 °.

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