JP2006046377A - 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 of the waveform parts 30 communicate with a transportation space for the fluid. The bottom parts 28a of the bottom parts 28 are formed in an axially flat or straight shape to form a cylindrical surface 32 forming a straight shape in the axial direction at the bottom part 28a of each waveform part 30. Where the axial dimension of an opening part 34 between the bottom parts 28 and 28 adjacent to each other is B and the axial dimension of the bottom parts 28 is A, the requirement of an expression 0.15A≤B≤0.5A is satisfied. <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, the permeation regulation of automobile fuels has become strict from the viewpoint of global environmental protection, and the regulation 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 hose for transporting hydrogen gas or the like used in a fuel cell, extremely high permeation resistance is required for the transport fluid such as hydrogen gas.
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 turbulent flow is likely to occur due to the unevenness during fluid transportation. 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 described problems with the bellows hose made of a metal bellows tube, such problems also occur in hoses having other bellows tubes made of resin.
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. Is a bellows tube hose having a space communicating with the internal space of the bellows tube through which fluid flows, and the bottom of the valley is flat and straight in the axial direction, and the bottom of each corrugated portion is A cylindrical surface having a straight shape in the axial direction is formed, and when the axial dimension of the opening between the adjacent valleys and the valleys is B and the axial dimension of the valleys is A, the following (Formula 1)
0.15A ≦ B ≦ 0.5A (Formula 1)
It is characterized by satisfying.

  According to a second aspect of the present invention, in the first aspect, the axial dimension B of the opening is smaller than the axial dimension C of the inner space of the peak portion in the corrugated portion, and the inner space of the peak portion is It is characterized in that it has a spreading shape with respect to the opening.

According to a third aspect of the present invention, in any one of the first and second aspects, when the axial dimension between the ridges is D and the axial dimension of the ridges is E, (Equation 2)
0.16E ≦ D (Formula 2)
It is characterized by satisfying.

Effects and effects of the invention

As described above, according to the present invention, the bottom shape 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 of each corrugated portion.
In the bellows tube hose of the present invention, since the fluid can smoothly flow along the cylindrical surface formed at the bottom of each corrugated portion, the generation of turbulence and the resonance of the tube itself are suppressed. Generation and vibration can be effectively suppressed.

The present invention is also characterized in that the axial dimension B of the opening between adjacent valleys is set to B ≦ 0.5 A with respect to the axial dimension A of the valleys.
Thus, by reducing the axial dimension B of the opening, the dividing length of the cylindrical surface by the opening can be shortened, the flow of fluid can be smoothed, and the inner space of the corrugated part from the opening. It is possible to further suppress the generation of turbulence due to the flow of fluid into the fluid, and more effectively suppress the generation of flow noise and vibration.

  However, if the axial dimension B of the opening is too small, the adjacent valley portions hit when the bellows tube hose is bent, and the flexibility of the bellows tube hose is impaired. Wearing it causes wear and the like, and the durability of the bellows tube hose decreases.

  Therefore, in the present invention, the occurrence of such a problem is prevented by setting the axial dimension B of the opening to a certain value or more, specifically, 0.15A ≦ B.

  Next, according to the second aspect, the axial dimension B of the opening is made smaller than the axial dimension C of the inner space of the peak portion in the corrugated portion, and the inner space of the peak portion is expanded with respect to the opening portion. In this case, the inner space of the mountain portion becomes an expansion space with respect to the opening portion, and each corrugated portion can have a function as a silencer. Generation can be further suppressed.

  Next, according to the third aspect of the present invention, the axial dimension D between the ridges is 0.16E ≦ D with respect to the axial dimension E of the ridges. It is possible to solve the problem that the mountain portion hits when the hose is bent.

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 reduced diameter 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.

  In FIG. 2 (B), 34 represents the opening between the adjacent troughs 28 and 28, and in this embodiment, the axial dimension B of the opening 34 is small. Specifically, the axial dimension B of the opening 34 is B ≦ 0.5A with respect to the axial dimension A of the valley 28.

The axial dimension B of the opening 34 is also 0.15A ≦ B with respect to the axial dimension A of the valley 28.
The axial dimension B of the opening 34 is also smaller than the axial dimension C of the inner space of the ridge 26, and the inner space of the ridge 26 is widened with respect to the opening 34. Yes.

In the present embodiment, the axial dimension D between the adjacent peak portions 26 and 26 satisfies the relationship of 0.16E ≦ D with respect to the axial dimension E of the peak portion 26.
That is, the interval between the ridges 26 is also a predetermined interval or more.

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 axial dimension B of the opening 34 is 1.1 mm, and the axial dimension A of the valley 28 is 3.6 mm.
In FIG. 2B, C is 3.2 mm, D is 1.3 mm, and E is 3.4 mm.

  In the bellows tube hose 10 of this embodiment, since the fluid can smoothly flow along the cylindrical surface 32 formed at the bottom portion 28a of each corrugated portion 30, the occurrence of turbulence and the resonance of the tube itself are prevented. It is possible to effectively suppress the generation of flow noise and vibration.

  Further, in the present embodiment, by reducing the axial dimension B of the opening 34, the division of the cylindrical surface 32 by the opening 34 can be reduced, and fluid can flow from the opening 34 to the inner space of the corrugated part 30. Generation of turbulent flow due to flowing in can be suppressed, and consequently generation of flow noise and vibration can be more effectively suppressed.

  However, if the axial dimension B of the opening 34 is made too small, the adjacent valleys 28 come into contact with each other when the bellows tube hose 10 is bent as shown in FIG. The flexibility is impaired, and the adjacent valley portions 28 come into contact with each other, thereby causing wear and the like, and the durability of the bellows tube hose 10 is lowered.

  Therefore, in the present invention, the occurrence of such a problem is prevented by setting the axial dimension B of the opening 34 to a certain value or more, specifically 0.15 A or more.

  In this embodiment, the axial dimension B of the opening 34 is made smaller than the axial dimension C of the inner space of the peak portion 26 in the corrugated portion 30, and the inner space of the peak portion 26 extends with respect to the opening 34. In this case, the inner space of the mountain portion 26 becomes an expansion space for the fluid with respect to the opening portion 34, and each corrugated portion 30 can have a function as a silencer. And the occurrence of vibrations can be further suppressed.

  In the present embodiment, when the bellows tube hose 10 is bent because the axial dimension D between the peak portions 26 and 26 is 0.16E ≦ D with respect to the axial dimension E of the peak portion 26. The problem that the ridges 26 and 26 hit each other can also be solved.

Although the embodiment of the present invention has been described in detail above, this is merely an example.
For example, the corrugated portions 30 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 relates to a hose having a bellows tube made of 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 of the present invention.

It is a figure of the 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 operation | movement explanatory drawing of the embodiment. It is a figure of the conventional metal bellows tube.

Explanation of symbols

10 Bellows tube hose 18 Metal bellows tube (bellows tube)
26 Mountain part 28 Valley part 28a Bottom part 30 Corrugated part 32 Cylindrical surface 34 Opening part

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 forming a space communicating with the space,
The shape of the bottom of the valley is flat and straight in the axial direction to form a cylindrical surface that is straight in the axial direction at the bottom of each corrugated portion, and the adjacent valley and valley Assuming that the axial dimension of the opening between B is B and the axial dimension of the valley is A, the following (formula 1)
0.15A ≦ B ≦ 0.5A (Formula 1)
A bellows tube hose characterized by satisfying   In Claim 1, The axial direction dimension B of the said opening part is a smaller dimension than the axial direction dimension C of the inner space of the peak part in the said waveform part, Comprising: The inner side space of this peak part spreads with respect to this opening part. A bellows tube hose characterized by a shape. In any one of Claim 1, 2, when the axial direction dimension between the said peak part is set to D and the axial direction dimension of the said peak part is set to E, (Formula 2)
0.16E ≦ D (Formula 2)
A bellows tube hose characterized by satisfying

Images