JP4877158B2 - Fluid transfer hose - Google Patents

Description

  The present invention relates to a fluid conveyance hose, and more particularly to a fluid conveyance hose that improves the effect of preventing peeling between an inner rubber layer and a connection fitting in a large-diameter hose for fluid cargo handling such as a marine hose.

  A large-diameter hose for cargo handling represented by a marine hose needs to have appropriate flexibility in order to cope with bending and twisting during use, in addition to the resistance to internal pressure against a fluid fed at high pressure. Therefore, as shown in FIG. 5, this type of hose has a basic structure in which reinforcing layers 7 and 8 having flexibility and strength and a cover rubber layer 10 are laminated in order on the outside of the inner rubber layer 2. Yes. A connection fitting 3 is attached to the end of the hose. The fitting 3 is attached such that the nipple portion 4 is inserted into the end portion of the hose, and the inner rubber layer 2 is adhered to the outer periphery of the nipple portion 4 in a liquid-tight manner. A plurality of such hoses are connected via the connection fitting 3, and oil is conveyed at high pressure between an offshore tanker and a storage tank on the land.

  Therefore, the hose extends in the axial direction of the hose due to the pressure of oil during oil transportation, and a tensile tension F is also generated in the inner rubber layer 2. Therefore, as shown in FIG. 6, there is a problem that separation occurs at the boundary between the end face 13 of the nipple portion 4 and the inner rubber layer 2, and oil gradually flows into the hose inner layer side as it gradually expands. In particular, as shown in FIG. 7, in the hose in which the non-flowing canvas 16 is disposed so that a part of the inner rubber layer 2 does not flow inside the connection fitting 3 when the hose is manufactured, the nipple portion 4 and the inner rubber layer 2 are arranged. Since the adhesive strength with the lowering, it becomes easier to peel off.

  In order to solve such a problem, Patent Document 1 discloses a reinforcing rigid layer for preventing deformation of the inner rubber layer in the hose axial direction in the bias reinforcing layer outside the bonded portion between the inner rubber layer and the connection fitting. Propose to arrange.

However, since the above-mentioned reinforcing rigid layer is disposed in the bias reinforcing layer and does not directly reinforce the inner rubber layer, it does not always effectively suppress the extension of the inner rubber layer in the hose axial direction. Therefore, it was necessary to further improve the effect of preventing peeling from the nipple portion of the connection fitting.
Japanese Patent Laid-Open No. 60-4690

  An object of the present invention is to provide a fluid conveyance hose that further improves the effect of preventing peeling of the inner rubber layer from the connection fitting.

In order to achieve the above object, in the fluid conveyance hose of the present invention, the nipple portion (4) of the connection fitting (3 ) is inserted into the end portion of the hose body (1) lined with the inner rubber layer (2). , in the fluid conveying hose fitted with a connection fitting (3) as inner rubber layer (2) is covering the nipple portion (4), the nipple portion to the inner surface rubber layer (2) end face of (4) (13) embedded a reinforcing layer (12) so as to cross back and forth, and Rutotomoni are arranged in parallel to the reinforcing cords of the reinforcing layer (12) in the axial direction of the hose, inner rubber layer (2) and the nipple end face (4) At the boundary with (13), a part of the inner rubber layer (2) is extended from the end face (13) of the nipple part (4) while keeping the inner diameter constant so as to cover the inner peripheral surface side. It is a feature.

In this fluid transfer hose, a step (15) is formed at the inner end of the nipple portion (4) so that the nipple portion (4) and the extended part of the inner rubber layer (2) are flush with each other. It is good to store a part extended by providing. The length W of the inner rubber layer (2) covering the inner peripheral surface side from the end surface (13) of the nipple portion (4) is preferably 5 mm or less.

Furthermore, the end face distance L1 and L2 extending in the front and rear axial direction of the hose from (13) are both set to 20 to 50 mm, reinforcing layer (12) inner rubber layer of the reinforcement layer (12) is nipple portion (4) (2 It is desirable that the position embedded in the inner surface rubber layer (2) has a thickness range of 6 to 14 mm from the inner peripheral surface.

  It is desirable to use a metal cord or a highly elastic organic fiber cord as the reinforcing cord.

  The fluid conveyance hose of the present invention is preferably used for a marine hose for oil conveyance.

  According to the fluid transfer hose of the present invention, the reinforcing layer is embedded in the inner rubber layer so as to straddle the end surface of the nipple portion of the connection fitting in the front-rear direction, and the reinforcing cords of the reinforcing layer are arranged parallel to the hose axial direction. In addition, since the rigidity of the inner rubber layer itself in the hose axial direction is increased and the inner rubber layer is restrained from being stretched with respect to the tension during fluid conveyance, the effect of preventing the inner rubber layer from peeling off from the nipple portion can be further improved. .

  Embodiments of the present invention will be described below with reference to the drawings.

FIG.1 and FIG.2 shows the edge part structure in the hose for fluid conveyance which consists of a reference example of this invention.

  In this fluid transfer hose, a connection fitting 3 is attached to an end of a hose body 1 via an inner rubber layer 2 in a liquid-tight manner. The connection fitting 3 is composed of a nipple portion 4 into which the end portion of the hose body 1 is extrapolated and a flange portion 5 welded to the outer end of the nipple portion 4.

  The hose body 1 has a structure in which a bias reinforcing layer 7, a spiral wire reinforcing layer 8, an outer reinforcing layer 9 and a cover rubber layer 10 are sequentially laminated on the outer periphery of the inner rubber layer 2. The inner rubber layer 2 is made of a material excellent in corrosion resistance to the fluid flowing in the hose. The bias reinforcing layer 7 is configured by laminating a plurality of layers made of organic fiber cords so that the cords cross each other. The bias reinforcing layer 7 mainly imparts axial strength and moderate flexibility to the hose. The spiral wire reinforcing layer 8 is formed by winding a metal wire in a spiral shape at a predetermined pitch, and mainly imparts strength in the circumferential direction to the hose and prevents kinks from occurring when the hose is bent. In addition, the hose is prevented from being crushed by external pressure. A plurality of fixing rings 6 are attached to the outer periphery of the intermediate portion of the nipple portion 4, and bias reinforcement is provided in the vicinity of the fixing ring 6 in order to improve liquid tightness between the hose body 1 and the connection fitting 3 and to prevent detachment. Layer 7 is turned back by fixed wire 11. Note that a buoyancy layer made of sponge, foamed rubber, or the like may be provided inside the cover rubber layer 10.

  In such a fluid conveyance hose, the reinforcing layer 12 is embedded in the inner rubber layer 2 so as to straddle the end surface 13 of the nipple portion 4 in the front-rear direction. The reinforcing layer 12 is constituted by a cord layer such as a weave weave in which a plurality of reinforcing cords are arranged substantially in parallel with the axial direction of the hose. The number of the reinforcing layers 12 may be a single layer or may be composed of a plurality of layers. The material of the reinforcing cord is desirably a metal cord or an organic fiber cord. Examples of the metal cord include steel cords, and examples of the organic fiber cord include highly elastic aramid fibers and polyester fibers.

  Thus, the reinforcing layer 12 is embedded in the inner rubber layer 2 so as to straddle the end surface 13 of the nipple portion 4 of the connection fitting 3 and the reinforcing cords of the reinforcing layer 12 are arranged in parallel to the hose axial direction. Therefore, the tensile rigidity of the inner rubber layer 2 itself in the hose axial direction is increased, and the elongation of the inner rubber layer 2 with respect to the tension at the time of fluid conveyance is suppressed, so that the peeling prevention effect at the end face 13 of the nipple portion 4 of the inner rubber layer 2 is prevented. Can be improved.

  Regarding the length of the cord reinforcing layer 12 in the hose axial direction, the length L1 in the direction away from the connection fitting 3 and the length L2 extending in the direction of the connection fitting 3 from the end surface 13 of the connection fitting 3 are both used. It is desirable to set it as 20-50 mm. If it is less than 20 mm, the effect of improving the rigidity of the inner rubber layer 2 is insufficient, and if it exceeds 50 mm, the peeling preventing effect is substantially saturated and the production cost increases. Moreover, about the position of the hose radial direction of the reinforcement layer 12, it is desirable to make thickness H from the inner peripheral surface of the inner surface rubber layer 2 into the range of 6-14 mm. If it is less than 6 mm, it will be too close to the nipple part 4 and the adhesiveness between the inner rubber layer 2 and the nipple part 4 will be reduced, so that peeling will be promoted. If it exceeds 14 mm, the effect of imparting rigidity to the region on the nipple portion 4 side of the inner rubber layer 2 is reduced, and the effect of preventing peeling is reduced.

Figure 3 shows a partial cross-section of a fluid conveying hose made of implementation of the invention.

This fluid transfer hose is characterized in that, in the reference example of FIG. 1, a part of the inner rubber layer 2 is extended from the end face 13 of the nipple part 4 so as to line (cover) the inner peripheral surface side. Is. By providing the extending portion 2a, it is possible to make it difficult for local peeling of the inner rubber layer 2 on the end surface 13 of the nipple portion 4 to occur. The length W of the extending portion 2a is desirably 5 mm or less. If it exceeds 5 mm, it becomes difficult to bond the inner surface of the nipple part 4 to the extending part 2 a, so that the extending part 2 a is easily separated from the inner peripheral surface of the nipple part 4 by the pressure of the fluid. Furthermore, it becomes difficult to pull out the mandrel when manufacturing the marine hose. Further, the thickness of the extending portion 2a is not particularly limited, but is preferably 1 to 4 mm in order to make it difficult to receive the pressure of the fluid.

FIG. 4 shows a partial cross-section of a fluid transfer hose according to another embodiment of the present invention. The extension portion 2a in FIG. A step 15 is provided at the inner end portion to accommodate the extending portion 2a so that the inner peripheral surface of the nipple portion 4 and the inner peripheral surface of the inner rubber layer 2 are flush with each other.

  3 and 4, the inner rubber layer 2 extends from the end face 13 of the nipple portion 4 by extending the inner rubber layer 2 so as to line the inner peripheral surface of the nipple portion 4. Since peeling becomes difficult, the effect of preventing peeling from the nipple portion 4 of the inner rubber layer 2 can be further improved. Moreover, since it is not necessary to use a flow-preventing canvas at the time of manufacturing, the adhesion between the inner rubber layer 2 and the nipple part 4 can be made stronger, so that the inner rubber layer 2 is peeled from the nipple part 4. The effect of prevention can be further improved.

  The fluid conveyance hose of the present invention is preferably applied as a large-diameter hose for fluid cargo handling, and particularly preferably used for a marine hose that conveys oil between an offshore tanker and a stockpile tank on land. it can.

It is sectional drawing which shows the hose for fluid conveyance which consists of a reference example of this invention. It is an enlarged view of the X section in FIG. It is an enlarged view of X portion in the fluid conveying hose made of implementation of the invention. It is an enlarged view of the X section in the fluid conveyance hose which consists of another embodiment of this invention. It is sectional drawing which shows the hose for conventional fluid conveyance. It is an enlarged view of the Y section in FIG. It is an enlarged view of Y section at the time of providing a non-flowing canvas of an inner rubber layer in manufacturing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hose main body 2 Inner surface rubber layer 2a Extension part 3 Connection metal fitting 4 Nipple part 5 Flange part 6 Fixing ring 7 Bias reinforcement layer 8 Spiral wire reinforcement layer 9 Outer reinforcement layer 10 Cover rubber layer 11 Fixed wire 12 Reinforcement layer 13 End surface 14 Taper 15 steps 16 canvas

Claims (7)

Nipple portion of the inner rubber layer connection fitting to the end of (2) hose body that is lining (1) (3) Insert the (4), covering the inner rubber layer (2) is the nipple portion (4) In the fluid transfer hose to which the connection fitting (3) is attached,
A reinforcing layer (12) is embedded in the inner rubber layer (2) so as to straddle the end surface (13 ) of the nipple portion (4) in the front-rear direction, and the reinforcing cord of the reinforcing layer (12) is parallel to the hose axial direction. Rutotomoni are arranged to,
At the boundary portion between the inner rubber layer (2) and the end surface (13) of the nipple portion (4), a part of the inner rubber layer (2) is inner peripheral from the end surface (13) of the nipple portion (4). A fluid transfer hose that has a constant inner diameter so as to cover the surface side . A step (15) is provided at the inner end of the nipple part (4) so that the nipple part (4) and the extended part of the inner rubber layer (2) are flush with each other. The fluid conveyance hose according to claim 1, wherein a part of the fluid is contained. The fluid conveyance hose according to claim 1 or 2, wherein a length W of the inner rubber layer (2) covering an inner peripheral surface side from an end surface (13 ) of the nipple portion (4) is within 5 mm. 4. The distances L <b> 1 and L <b> 2 at which the reinforcing layer (12) extends from the end surface (13 ) of the nipple part (4) in the front-rear direction of the hose axis are both 20 to 50 mm. Fluid hose. The position where the said reinforcement layer (12) is embed | buried under the said inner surface rubber layer (2) was made into the thickness range of 6-14 mm from the internal peripheral surface of this inner surface rubber layer (2) . The fluid transfer hose described in 1.   The fluid conveying hose according to claim 1, wherein the reinforcing cord is a metal cord or a highly elastic organic fiber cord.   It is a marine hose for oil conveyance, The hose for fluid conveyance in any one of Claims 1-6.