JP3025102B2 - Reinforced rubber hose - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforced rubber hose used for dredging and for transporting oil and other fluids.

[0002]

2. Description of the Related Art Conventionally, the above-mentioned reinforced rubber hose has a sectional structure as shown in FIG. That is, the reinforcing rubber hose is formed by the inner rubber layer 91 and the reinforcing layer 9 from the inner peripheral side.
2. A buckling-resistant layer 93 including a rigid member 93a formed of a spiral wire or a ring, a breaker layer 94, and an outer rubber layer 9
5 are sequentially laminated.

As the inner rubber layer 91, a material having excellent corrosion resistance to a fluid to be transported is used. The reinforcing layer 92
It is configured to include a fiber cord arranged so as to form a predetermined angle (hereinafter, referred to as a cord angle) with respect to the hose axis direction, and mainly contributes as a pressure-resistant layer. The rigid member 93a such as a helical wire prevents the reinforcing rubber hose from crushing or buckling due to bending, and particularly restricts the radial expansion (extension in the circumferential direction) of the reinforcing layer 92.
The breaker layer 94 prevents the rigid member 93a such as a spiral wire from being exposed to the outside and also prevents cuts due to external damage to the reinforcing rubber hose. As the outer rubber layer 95, a material having excellent weather resistance and the like is used.

In the above-described reinforced rubber hose, when the reinforcing layer 92 is cracked or broken for some reason, the internal fluid leaks out through the reinforcing layer 92 and flows out. If the leaked fluid is oil or a chemical, problems such as environmental pollution occur. In particular, if such a leak occurs at sea, the pollution becomes a very serious problem.

Therefore, as disclosed in Japanese Utility Model Laid-Open No. 2-41786, the reinforcing layer is composed of a main reinforcing layer on the inner peripheral side and a sub-reinforcing layer on the outer peripheral side, or disclosed in Japanese Patent Publication No. 57-15756. As described above, there is provided a reinforced rubber hose in which a fluid to be transported is held by the flexible bag and the auxiliary reinforcing layer when the main reinforcing layer is broken by providing a flexible bag. .

[0006]

By the way, the following 1) to 3) can be considered as modes in which the reinforced rubber hose is broken. 1) The internal pressure rises above the strength of the reinforcing cord and breaks (the fatigue of the reinforcing cord is also a factor). 2) Cracks entered from inside for some reason reach the main reinforcing layer and break.

[0007] 3) A crack entered from outside for some reason reaches the main reinforcing layer and is broken. Generally, the destruction due to the cause 2) is very small, and the destruction due to 1) and 3) is large. The destruction caused by 3) is often caused by cutting by a ship screw or cutting by collision of driftwood. On the other hand, in the reinforcing rubber hose disclosed in the above publication, a sub-reinforcing layer and a flexible bag for retaining the internal fluid when the main reinforcing layer is broken are disposed on the outer peripheral side of the main reinforcing layer. Therefore, in the case of being injured, the auxiliary reinforcing layer and the flexible bag are damaged before the main reinforcing layer. Since damage to the auxiliary reinforcing layer, etc. cannot be detected, such a damaged rubber hose is used as it is.If the main reinforcing layer is broken during use, it cannot be detected and the internal fluid will not be detected. Will leak.

Further, in a conventional reinforcing rubber hose in which a sub-reinforcing layer is arranged on the outer peripheral side of the main reinforcing layer and the internal fluid is held by the sub-reinforcing layer when the main reinforcing layer is broken, the inner rubber layer which normally comes into contact with the internal fluid is provided. In addition, it is necessary to employ rubber layers having excellent corrosion resistance to the internal fluid for the two layers of the auxiliary reinforcing layer that comes into contact with the internal fluid in an emergency, which is uneconomical. On the other hand, Japanese Patent Publication No. 59-47188 and Japanese Patent Laid-Open No.
Japanese Unexamined Patent Application Publication No. 5 (1993) -205, there is also provided a structure in which a buoyant material is provided on the outer peripheral side of a sub-reinforcing layer. Although this buoyant material functions to prevent trauma, in such a structure, It is limited to hoses used at sea.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned technical problems, to reliably prevent leakage of internal fluid even in a state of being injured, to detect breakage of a main reinforcing layer, and to be used. To provide a wide and economical reinforced rubber hose.

[0010]

A reinforced rubber hose according to the present invention for achieving the above object has a tubular main reinforcing layer containing a fiber cord and a secondary reinforcing layer between a tubular inner rubber layer and an outer rubber layer. In a reinforced rubber hose in which a layer and a buckling-resistant layer are disposed, a sub-reinforcing layer is disposed on the inner peripheral side of the main reinforcing layer, and a buckling-resistant layer is disposed on the inner peripheral side of the sub-reinforcing layer. The fiber cord of the buckling-resistant layer is disposed so as to form an angle of 80 to 90 degrees with respect to the axis of the hose, and the fiber cord of the main reinforcing layer is formed with an angle of 35 to 90 degrees with respect to the axis of the hose.
The fiber cord of the sub-reinforcement layer is disposed at an angle of 45 degrees, and the fiber cord of the sub-reinforcement layer is at an angle of 35 to 50 degrees with respect to the hose axis direction, and the fiber cord of the main reinforcement layer is with respect to the hose axis direction. It is characterized by being arranged so as to form an angle larger than the angle formed.

[0011]

According to the above construction, the cord angle of the fiber cord of the sub-reinforcing layer is smaller than the static angle of 54 degrees 44 minutes.
Since the angle is set to 50 to 50 degrees, when the main reinforcing layer is broken, the sub-reinforcing layer expands in the radial direction (extends in the circumferential direction) so that the cord angle approaches the stationary angle. Therefore, the breakage of the main reinforcing layer can be detected by this expansion.

Further, in the conventional structure in which the sub-reinforcing layer is arranged on the outer peripheral side of the main reinforcing layer, only the sub-reinforcing layer may be damaged due to an injury, and if the main reinforcing layer is damaged in this state, it can be detected. However, in the present invention, since the auxiliary reinforcing layer is arranged on the inner peripheral side of the main reinforcing layer, the auxiliary reinforcing layer is not damaged earlier than the main reinforcing layer. In addition, the breakage of the main reinforcing layer can be reliably detected, and the leakage of the internal fluid can be prevented by the auxiliary reinforcing layer.

Furthermore, since the cord angle of the fiber cord of the sub-reinforcing layer is made larger than the cord angle of the fiber cord of the main reinforcing layer, the impact on the sub-reinforcing layer when the main reinforcing layer is broken can be reduced. Can be.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a schematic longitudinal sectional view of a reinforced rubber hose showing one embodiment of the present invention. Referring to the figure, this reinforced rubber hose A has an inner rubber layer 1 made of rubber excellent in corrosion resistance to an internal fluid, a buckling resistant layer 2 including a steel fiber cord B, and a fiber cord from the inner peripheral side. From a sub-reinforcing layer 3 containing a polyester fiber cord C, an intermediate rubber layer 4, a main reinforcing layer 5 containing a polyester fiber cord C, a breaker layer 6 for preventing cuts due to trauma, and rubber having excellent weather resistance. Outer rubber layers 7 are sequentially laminated.

The main reinforcing layer 5 is made of polyester fiber cord C
And at least two plies are laminated. Polyester fiber cord C between adjacent plies
Are arranged in opposite directions. The number of laminated plies of the main reinforcing layer 5 is selected so as to obtain a predetermined breaking strength. Referring to FIG. 2, cord angle θ of main reinforcing layer 5 with respect to hose axis direction P is preferably set in a range of 35 degrees to 45 degrees.

The sub-reinforcing layer 3 comprises a rubber layer containing at least two plies of a polyester fiber cord C made of the same material as the fiber cord on the main reinforcing layer 5 side. The number of laminated plies of the sub-reinforcing layer 3 is selected so as to obtain a predetermined breaking strength. The cord angle of the cord of the sub-reinforcing layer 3 is smaller than the rest angle so that the sub-reinforcing layer 3 can expand in the circumferential direction of the hose (expand in the radial direction) with the main reinforcing layer 5 broken. 3 small
The angle is preferably set in the range of 5 to 50 degrees, and more preferably in the range of 45 to 50 degrees.

The buckling-resistant layer 2 is made of a rubber layer containing a steel fiber cord B, and is laminated in at least two plies. The steel fiber cord B has a cord angle of 80 to 9 degrees.
It is preferable to set the angle in the range of 0 degrees. Note that a chemical fiber cord can be used instead of the steel fiber cord B. According to this embodiment, the cord angle of the polyester fiber cord C of the sub-reinforcing layer 3 is set to 35 degrees to 50 degrees, which is smaller than the static angle of 54 degrees and 44 minutes. The reinforcing layer 3 expands in the radial direction (extends in the circumferential direction) so that the cord angle approaches the stationary angle, so that the breakage of the main reinforcing layer 5 can be detected by this expansion.

Further, in the conventional device in which the sub-reinforcing layer is arranged on the outer peripheral side of the main reinforcing layer, only the sub-reinforcing layer may be damaged by an external injury, and if the main reinforcing layer is damaged in this state, it can be detected. However, in this embodiment, since the sub-reinforcing layer 3 is arranged on the inner peripheral side of the main reinforcing layer 5, the sub-reinforcing is performed before the main reinforcing layer 5. The layer 3 is not damaged, and therefore, even if the main reinforcing layer 5 is damaged as shown in FIG. 3 due to a trauma, this can be reliably detected by the expansion of the sub-reinforcing layer 3. In addition, leakage of the internal fluid can be reliably prevented by maintaining the strength of the sub-reinforcing layer 3.

Further, since the cord angle of the polyester fiber cord C of the sub-reinforcing layer 3 is made larger than the cord angle of the polyester fiber cord C of the main reinforcing layer 5, the sub-reinforcing layer 5 is broken when the main reinforcing layer 5 is broken. 3 can be reduced. In addition, only one inner rubber layer is required as the rubber layer having corrosion resistance to the internal fluid, which is economical.

Furthermore, since the intermediate rubber layer 4 is disposed between the main reinforcing layer 5 and the sub-reinforcing layer 3, the impact applied to the sub-reinforcing layer 3 when the main reinforcing layer 5 is broken can be reduced. The present invention is not limited to the above embodiments. For example, the buckling-resistant layer 2, the main reinforcing layer 5, and the sub-reinforcing layer 3
The fiber cord included in each may be any of a chemical fiber cord and a steel fiber cord, and, in addition to the polyester fiber, as the chemical fiber cord,
Nylon fiber, Kevlar fiber (Dupont) and the like can also be used. In addition, various design changes can be made without changing the gist of the present invention. Test In the reinforced rubber hose according to the example of FIG. 1, the buckling-resistant layer 2, the auxiliary reinforcing layer 3, the main reinforcing layer 5, and the like were set to the following specifications. Buckling resistant layer 2: Steel fiber cord B with cord angle of 90 degrees
Were laminated in two plies. Secondary reinforcing layer 3: Polyester fiber cord C having a cord angle of 45 degrees is laminated in two plies, and the designed breaking pressure is 2.94M.
Pa. Main reinforcement layer 5: Two layers of polyester fiber cord C having a cord angle of 35 degrees are laminated, and the designed breaking pressure is 7.84M.
Pa.

The inner diameter of the hose was 125 mm, and the thickness of the intermediate rubber layer 4 was 10 mm. Then, one end of the reinforcing rubber hose was covered and sealed, and a predetermined amount of water was injected per unit time from the other end to increase the internal pressure until the reinforcing rubber hose was broken, and the result shown in FIG. 4 was obtained. That is, when the main reinforcing layer 5 breaks at 8.33 MPa (indicated by a in the figure), the pressure in the hose drops rapidly, but the hose strength is maintained by the auxiliary reinforcing layer 3.
No internal fluid leaks. Then, when water is further injected, the interval between the steel fiber cords B of the buckling resistant layer 2 having a cord angle of 90 degrees with respect to the axis direction of the hose is increased, so that the internal pressure is applied to the auxiliary reinforcing layer 3. Become. In an attempt to make the cord angle of the polyester fiber cord C of the sub-reinforcing layer 3 closer to the stationary angle, the reinforcing rubber hose expanded in the radial direction. The rupture of the main reinforcing layer 5 could be detected by this expansion. Thereafter, the sub-reinforcing layer 3 was broken at 3.53 MPa (indicated by b in the figure).

[0022]

As described above, according to the reinforced rubber hose of the present invention, when the main reinforcing layer is broken, the sub-reinforcing layer expands in the radial direction, so that the breaking of the main reinforcing layer can be detected. In addition, even in the case of being injured, the auxiliary reinforcing layer is not damaged before the main reinforcing layer, so that when the main reinforcing layer is broken, this can be reliably detected by the auxiliary reinforcing layer. Leakage of the internal fluid can be prevented by maintaining the strength of the auxiliary reinforcing layer.

Further, since the cord angle of the fiber cord of the sub-reinforcement layer is made larger than the cord angle of the fiber cord of the main reinforcement layer, the impact on the sub-reinforcement layer when the main reinforcement layer is broken can be reduced. Can be. In addition, since only one inner rubber layer is required as the rubber layer having corrosion resistance to the internal fluid, various special effects such as economy are exhibited.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of a reinforced rubber hose according to one embodiment of the present invention.

FIG. 2 is a schematic view showing an arrangement direction of polyester fiber cords.

FIG. 3 is a schematic longitudinal sectional view showing a state in which a main reinforcing layer of a reinforced rubber hose is broken.

FIG. 4 is a diagram showing a change over time of a hose internal pressure when water is injected by a predetermined amount.

FIG. 5 is a schematic longitudinal sectional view of a conventional reinforced rubber hose.

[Explanation of symbols]

 Reference Signs List 1 inner rubber layer 2 buckling resistant layer 3 auxiliary reinforcing layer 5 main reinforcing layer 7 outer rubber layer C polyester fiber cord D steel fiber cord P hose axis direction

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16L 11/08 B32B 1/08

Claims (1)

(57) [Claims] 1. A method according to claim 1, wherein the inner rubber layer and the outer rubber layer have a tubular shape.
In a reinforcing rubber hose having a tubular main reinforcing layer, a sub-reinforcing layer and a buckling-resistant layer including a fiber cord, a sub-reinforcing layer is provided on an inner peripheral side of the main reinforcing layer, and a sub-reinforcing layer is provided. A buckling-resistant layer is disposed on the inner peripheral side of the hose.
The fiber cord of the main reinforcing layer has an angle of 35 to the hose axial direction.
The fiber cord of the sub-reinforcing layer is disposed at an angle of about 45 degrees to about 45 degrees with respect to the hose axis direction.
A reinforced rubber hose having an angle of from 50 to 50 degrees and arranged so that the fiber cord of the main reinforcing layer forms an angle larger than the angle formed by the hose axis direction.