JP3171850U - Pressure hose - Google Patents

Abstract

A pressure hose capable of increasing the pressure strength of a pressure hose without increasing the thickness of the hose body and maintaining the flexibility. A pressure-resistant hose in which a reinforcing cord 3 in which a cross yarn 31 is arranged in a mesh shape is provided inside a cylindrical hose body 2 and a core material 4 is arranged in a spiral shape on the outer periphery of the hose body. At least two weft threads 32 are provided in parallel to the arrangement direction of the core material within the range of the core material pitch arranged in a shape, and the core material is a chlorinated PVC resin, a polyvinyl chloride resin, or a polyolefin resin. It is characterized by comprising. [Selection] Figure 2

Description

  The present invention relates to a pressure-resistant hose suitable for irrigation, industrial use, civil engineering work site, and suction / drainage in nuclear reactor facilities.

  Conventionally, as a pressure hose, a core material made of a hard resin is spirally wound around the outer periphery of a tube made of a soft resin so that a part of the core material is embedded in the outer periphery, and further integrated with the tube. In order to increase the breaking pressure, there is known one in which a coiled metal protective plate is fixed to the outer peripheral surface of a spirally wound core material. Moreover, in the said pressure | voltage resistant hose, providing the lining rubber provided with the reinforcement cord on the inner surface of a pipe body is proposed (for example, refer patent document 1).

  As shown in FIG. 7 of Patent Document 1, the reinforcing cord is formed by winding a cross yarn around the outer circumferential surface of the lining rubber 3 with a thread winding machine 12. Specifically, as shown in FIG. 3 attached to the present specification, a plurality of parallel cross yarns 31 that incline in the right upward direction with respect to the hose axial direction of the pressure hose 100 and a plurality in the right downward direction. Are formed in a mesh shape by crossing the parallel cross yarns 31.

  However, with such a reinforcing cord in which the cross yarns 31 and 31 are only crossed in two directions, the pressure-resistant strength is limited, for example, a region where the core material s1 does not exist in the tubular body is expanded by the fluid pressure flowing through the tubular body. Therefore, it is necessary to increase the thickness t1 of the tubular body to some extent.

  In the figure, p1 represents the winding pitch of the core material, and D1 represents the outer diameter of the pressure hose.

Japanese Patent Laid-Open No. 7-299879

  However, if the thickness t1 of the tube is increased, the weight of the pressure hose increases and the flexibility of the pressure hose decreases, which is negative. In addition, it imposes restrictions on workability and efficiency of management, and further, it is difficult to reduce material costs. In addition, since the pressure resistance is remarkably reduced in a high temperature region, there is a problem that the operating pressure of the hose has to be lowered.

  The present invention has been made in consideration of the problems in the conventional pressure hose as described above, and can increase the pressure strength of the pressure hose without increasing the thickness of the hose body, and can maintain flexibility. In addition, the present invention provides a pressure-resistant hose that can increase the operating pressure even in a high-temperature region as compared with a conventional product.

The present invention provides a pressure-resistant hose in which a reinforcing cord in which a cross yarn is arranged in a mesh shape is provided inside a cylindrical hose body, and a core material is helically arranged on the outer periphery of the hose body.
Within the range of 1 pitch of the core material arranged in a spiral shape, at least two wefts are provided in parallel with the arrangement direction of the core material,
The core material is a pressure-resistant hose made of a chlorinated PVC resin, a polyvinyl chloride resin, or a polyolefin resin.

  The pressure-resistant hose in the present invention means a hose having an allowable stress of about 0.5 to 3.0 MPa as pressure resistance.

  In the present invention, the cross yarn and the weft constituting the reinforcing cord are preferably constituted by a single yarn or a plurality of twisted aramid fibers or polyarylate fibers having a fineness of 500 to 3000 T (decitex).

  According to the pressure-resistant hose according to the present invention, the pressure-resistant strength of the pressure-resistant hose can be increased without increasing the thickness of the hose body, the flexibility can be maintained, and the operating pressure is higher than that of the conventional product even in a high temperature region. It has the advantage that it can be increased.

It is a front view which has one part notch which shows one Embodiment of the pressure | voltage resistant hose which concerns on this invention. It is a principal part expanded sectional view of the pressure | voltage resistant hose shown in FIG. It is the FIG. 1 equivalent view which shows the structure of the conventional pressure | voltage resistant hose.

  Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.

  In FIG. 1, a pressure-resistant hose 1 according to the present invention has a reinforcing cord 3 in which cross yarns 31, 31 are arranged in a mesh shape inside a cylindrical hose body 2, and a core material 4 on the outer periphery of the hose body 2. Is spirally wound and integrated with the hose body 2. In the figure, D2 represents the outer diameter of the pressure hose 1, and p2 represents the winding pitch of the core material 4.

  In manufacturing the hose body 2, as shown in FIG. 2, a lower winding tape 20 made of chlorinated PVC resin, synthetic rubber or thermoplastic elastomer is formed into a cylindrical shape with a predetermined overlap margin, Cross yarns 31, 31 as reinforcing cords 3 are arranged in a net-like manner, and weft yarns 32 are spirally wound at a predetermined pitch, on which a medium-winding tape made of the same kind of material as the lower-winding tape 20 is wound. 21 is laminated, and an outer layer 22 made of the same kind of material as the lower winding tape 20 is laminated on the outer side.

  Chlorinated vinyl chloride resin is a chlorinated vinyl chloride polymer that has improved heat resistance by chlorinating vinyl chloride polymer without impairing the performance of the vinyl chloride polymer. It is said that there is a feature.

  In the present invention, a pressure-resistant hose mainly composed of chlorinated PVC is manufactured by utilizing the second characteristic of chlorinated PVC, that is, the excellent tensile strength and rigidity in a high temperature range.

  Moreover, the core material 4 arrange | positioned at the outer peripheral part of the hose main body 2 consists of a chlorinated vinyl chloride resin, a polyvinyl chloride resin, or polyolefin resin, and a polyethylene resin and a polypropylene resin are illustrated in more detail as a polyolefin resin. . The core material 4 is extruded in a cylindrical shape and is wound around the outer periphery of the hose body 2 in a spiral shape, and is held by the hose body 2 by the outer layer 22.

  The cross-sectional shape of the core material 4 is not limited to a circle, and may be, for example, an ellipse or a square.

  Returning to FIG.

  The thickness t2 of the hose body 2 can be set within a range of 2 mm to 15 mm in the case of a pressure resistant hose having an inner diameter of about 100 mm, for example, but in the present embodiment, it is set to 4 to 8 mm as a more preferable thickness.

  The reinforcing cord 3 embedded in the hose body 2 includes cross yarns 31 and 31 arranged in a mesh shape, and a weft yarn 32 arranged in parallel to the core material 4 and in a direction intersecting with the cross yarns 31 and 31. It is composed of

  These cloth yarns 31, 31 and weft yarn 32 can be composed of aramid fibers or polyarylate fibers, respectively. More specifically, it is composed of a single yarn or a plurality of twisted aramid fibers or polyarylate fibers having a fineness of 500 to 3000 T (decitex).

  Aramid fiber and polyarylate fiber are generally excellent in high strength, low water absorption, wear resistance, dimensional stability, etc., and high strength is equivalent to steel fiber, compared to steel fiber. And 1/5 to 1/6 light. Therefore, when the aramid fiber or polyarylate fiber is used for the reinforcing cord 3, there is an advantage that the pressure resistance can be improved and the pressure hose can be reduced in weight.

  In this embodiment, the case where an aramid fiber or a polyarylate fiber is used for the cross yarn and the weft is described as an example. However, the present invention is not limited to these fibers, and another fiber having the same characteristics as those fibers may be used. You can also.

  Further, the cloth yarn 31 and the weft yarn 32 constituting the mesh may be different fibers, or the same fiber may have different fineness or different numbers of twists.

  In addition, it is preferable that at least two wefts 32 are provided within the range of one pitch of the core material 4 wound around the outer periphery of the hose body 2.

  Further, the weft 32 is preferably disposed so as to pass through the crossing position where the cross yarns 31 and 31 intersect or in the vicinity thereof, so that the pressure resistance can be further improved.

  Comparing the breakdown pressure of the pressure hose of the present invention with that of the conventional pressure hose, the conventional one has a break pressure of 2 to 3 MPa at a water temperature of 50 ° C., whereas the one of the present invention has the same water temperature of 50 ° C. The breaking pressure at 5 to 6 MPa was able to increase the pressure resistance.

  However, the diameter of each pressure hose used for the measurement of the breaking pressure is 100 mm.

  Moreover, the Vicat softening point of the pressure hose according to the present invention is 75 to 95 ° C, whereas the Vicat softening point of the pressure hose according to the present invention is improved to 95 to 115 ° C, and the heat resistance is improved. It was also confirmed.

DESCRIPTION OF SYMBOLS 1 Pressure-resistant hose 2 Hose body 3 Reinforcement cord 4 Core material 20 Lower volume tape 21 Middle volume tape 22 Outer layer 31 Cross thread 32 Weft

Claims (2)

In the pressure hose provided with a reinforcing cord in which a cross yarn is arranged in a mesh shape inside a cylindrical hose body, and a core material is arranged in a spiral shape on the outer periphery of the hose body,
Within the range of 1 pitch of the core material arranged in a spiral shape, at least two wefts are provided in parallel with the arrangement direction of the core material,
A pressure-resistant hose characterized in that the core material is composed of a chlorinated vinyl chloride resin, a polyvinyl chloride resin, or a polyolefin resin.   2. The pressure-resistant hose according to claim 1, wherein the cross yarn and the weft constituting the reinforcing cord are made of a single yarn or a plurality of twisted aramid fibers or polyarylate fibers having a fineness of 500 to 3000 T (decitex).

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