JP2006105162A - Hose for feeding hot/cold water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive hose for feeding hot/cold water, easily bendable with a small radius so as to be constructible even in a narrow piping space without causing a kink. <P>SOLUTION: The hose used for the piping for feeding hot or cold water is formed with an inner layer 1 formed of an elastic tube, an inner reinforcing layer 2 formed by covering the upper side of the inner layer 1 in cylindrical shape with strip fiber of woven or knit fabric shape, and an outer reinforcing layer 4 formed of metallic hard wire braided on the upper side. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hose used for faucet fittings and toilet storage tanks for kitchens and washstands, other water supply or hot water supply pipes, and in particular, can be easily bent even with a small radius, The present invention relates to a hot water / hot water hose that does not generate kinks.

  In recent years, hoses used in kitchens, washstands, toilet storage tanks, and other water supply or hot water supply pipes have an inner layer made of rubber or thermoplastic elastomer, and stainless steel wire, nylon, or polyester fiber on the upper side. A flexible hose braided with a reinforcing layer such as the like is used. Such a hose is called a hose-type flexible expansion joint, with joint fittings crimped and fastened at both ends, and is used for various piping works.

  However, because the space for piping work is relatively small and the length of the hose used is short, the hose-type flexible expansion joint may be bent forcibly during construction, or external force may be applied to the surrounding members. Many.

  Therefore, the hose may be bent and a kink may be generated in which the portion becomes flat. When this kink occurs, the water flow path is blocked and the amount of water flow decreases, and in extreme cases, the water flow itself may not be possible.

  In particular, in order to protect the hose-type flexible expansion joints from tap water containing chlorine, when the inner layer of the hose is made of polybutene resin, cross-linked polyethylene resin, etc., it is difficult to bend due to its high hardness and easy to kink. Therefore, improvement of the hose was desired.

  Patent Document 1 has been proposed to solve this problem.

JP 2003-343773 A

  The hose used in the water supply or hot water supply pipe proposed in Patent Document 1 includes at least an inner layer 1 in contact with water or hot water, an inner reinforcement layer 2 made of fiber yarn wound spirally on the upper side of the inner layer 1, A pressurizing thread 3 wound to maintain the spiral pitch, an outer reinforcing layer 4 made of a hard metal wire braided on the upper side, and a hose for hot and cold water supply, preferably further covered with a jacket layer 5. .

  The water / hot water hose obtained here has stable characteristics, is easy to bend, and has a great feature of being less kinked.

  Although this technique is extremely excellent as a water supply / hot water hose, there is a demand for improvement. That is, when configuring the inner reinforcing layer, it is necessary to wind the fiber yarn in a spiral shape, but a dedicated machine for winding in this spiral shape is required, so the price of the hose is expensive. It is a point that becomes.

  Therefore, the present invention aims to provide an inexpensive water and hot water supply hose that can be easily bent even with a small radius so that it can be constructed even in a narrow piping space, and that does not generate kink. is there.

  The present invention has been made in order to solve the above problems, and the gist of the present invention is a hose used for piping for water supply or hot water supply. The water supply hot water supply hose is formed by covering the upper side with a belt-like fiber in a cylindrical shape to form the inner reinforcement layer 2 and forming the outer reinforcement layer 4 made of a hard metal wire braided on the upper side.

  The hose for water supply and hot water supply of the present invention has the above-described configuration, and in particular, the inner reinforcing layer 2 is covered with a strip-like fiber so that a spiral dedicated machine is not required. In addition, the present invention has been able to provide an excellent water and hot water supply hose that has no blow-through phenomenon.

  In the conventional water and hot water supply hose, the inner reinforcing layer is wound in a spiral shape, but it is necessary to wind up accurately so that the pitch of the spiral does not shift. If the pitch is shifted and there is a gap, there is a fatal defect that internal fluid blows out. Accordingly, a dedicated machine for accurately winding the fiber is required, and further, in order to maintain the pitch of the wound spiral, it is necessary to further wind the presser thread from above.

  This is because when fiber yarns are braided, the inner reinforcing layer becomes thick when attempting to knit closely, and the entire hose becomes thick. On the contrary, if it is knitted roughly in order to prevent it from becoming thick, the inner layer may burst in the gap between the hard metal wires of the outer reinforcing layer without being able to withstand the internal pressure.

  The present invention is an improvement of the disadvantages of the prior art and is covered with a belt-like fiber made of woven fabric or knitted fabric as an inner reinforcing layer 2 for reinforcing the inner layer 1 made of an elastic tube. The point is the biggest feature. By doing so, the inner layer 1 is completely reinforced. Such a cylindrical shape is not particularly limited, and includes, for example, a configuration in which the surface of the inner layer 1 is wound with a belt-like fiber.

  Rubber or thermoplastic elastomer is preferably used for the tube inner layer of the water / hot water hose of the present invention. In particular, when tap water is passed, it is preferable that at least the innermost surface of the inner layer in contact with water or hot water is made of either polybutene resin or cross-linked polyethylene resin as a measure against chlorine contained in tap water.

  This inner layer may be a single layer structure or a laminated structure. That is, the inner layer can be composed of a single substance such as rubber, polybutene resin, cross-linked polyethylene resin, or a laminated structure in which an inner surface of rubber or the like is coated with a fluororesin as a countermeasure against chlorine in tap water.

  When a polybutene resin or a cross-linked polyethylene resin is used as the inner layer, a laminated structure may be used in consideration of the fact that the inner layer is hard and difficult to bend and kinks are likely to occur. That is, only the innermost surface of the inner layer in contact with water or hot water is made of a thin layer of polybutene resin or cross-linked polyethylene resin (thickness 0.15 mm to 0.5 mm), so that the inner layer of the water and hot water supply hose is reduced in bending rigidity. In general, a necessary thickness (about 1.0 mm to 3.0 mm) is ensured by a laminated structure. In this case, a two-layer structure in which a flexible polyolefin-based elastomer is laminated on the outer surface of the polybutene resin or the crosslinked polyethylene resin is preferable.

  The cylindrical body constituting the inner reinforcing layer is formed by forming a belt shape by using fiber yarn as a woven fabric or knitted fabric, and forming this into a cylindrical body. That is, the reason why the cylindrical fiber yarn is used as the inner reinforcing layer is to prevent the hose from being blown from the gap between the hard metal wires while ensuring the flexibility of the hose.

  As fiber yarns constituting the inner reinforcing layer, synthetic fibers such as polyester and nylon and vegetable fibers such as cotton can be used. The fiber yarn preferably has a thickness of 50 to 2500 deniers so as not to increase the thickness of the hose as much as possible and to ensure the same handleability as a conventional hose.

  The inner layer 1 and the inner reinforcing layer may be bonded or non-bonded. That is, if importance is attached to kink prevention, adhesion is preferable, and if flexibility is important, non-adhesion is preferable.

  Next, although it is an outer reinforcement layer, the present invention comprises a braided metal hard wire. Here, regarding the hard metal wire, the piano wire is defined in JIS G-3502, the hard steel wire is defined in JIS G-3506, and the spring stainless steel wire is defined in JIS G-4314. The reason for using this is to effectively prevent the occurrence of kinks and to ensure the pressure resistance of the hose when passing water. That is, even if the hose is bent to a small radius due to the rigidity of the hard metal wire, the portion does not become flat, and it is reinforced by internal pressure with a hose inner diameter (8 to 12 mmφ), which is a common hose for hot and cold water supply The layer is prevented from breaking.

  In this sense, soft wire is inappropriate, so metal hard wire is used in the present invention. Specifically, steel wire for springs and stainless steel hard wire considering corrosion prevention in water and hot water supply applications are preferably used. it can.

  As for the tensile strength of the metal hard wire which comprises an outer side reinforcement layer, 1500-3000 N / mm <2> is preferable. The wire diameter of the metal hard wire is preferably 0.15 to 0.5 mm. Although it depends on the type of metal hard wire, if the tensile strength is less than 1500 N / mm2 or the wire diameter is less than 0.15 mm, the rigidity will be low and the force against bending of the hose will be weak. is there. On the other hand, if the tensile strength exceeds 3000 N / mm 2 or the wire diameter exceeds 0.5 mm, the flexibility of the hose is adversely affected by the rigidity.

  Moreover, it is necessary to braid the metal hard wire. This is because when the metal wire is wound in a spiral shape, the pitch becomes coarse. That is, considering the flexibility of the hose, it is not a good idea to tightly wind the metal hard wire, so the metal hard wire is roughly wound in a spiral shape. Then, when the metal hard wire is wound on the drum in a state where the metal hard wire is exposed at the time of manufacture, the metal hard wire is rubbed between adjacent hoses to cause a positional shift, thereby deteriorating the productivity.

  Therefore, in the water / hot water supply hose of the present invention, the metal hard wire is braided, but the braid density is preferably 15 to 55%. This is because if the braid density is coarser than 15%, kinks are likely to occur, and if it is denser than 55%, the rigidity of the hose increases and the flexibility is impaired.

  Furthermore, the braiding angle of the metal hard wire greatly affects the bending rigidity and kink resistance of the hose. That is, if the knitting angle is large, it becomes easy to bend, but if it is wound tightly so as not to be kinked, the knitting speed is lowered and productivity is deteriorated. Accordingly, considering the balance of bending rigidity, kink resistance and productivity, the braiding angle is preferably set to 54 to 70 °.

  In addition, even if it is a steel wire for springs, if the coating layer which consists of resin is provided on the upper side, it will become the prevention of corrosion. Moreover, even if it is a stainless steel hard wire, it is preferable to provide a coating layer from a viewpoint of preventing external damage. As the resin constituting the coating layer, for example, a styrene thermoplastic resin or a urethane resin is suitable.

  As described above, from the viewpoint of bending rigidity, kink resistance, productivity, etc., the outer reinforcing layer in the hose of the present invention has a braided structure of hard metal wire. In addition, blow-through of water and hot water becomes a problem. That is, the inner layer of the thermoplastic elastomer is easily broken in the gap between the reinforcing layers, particularly during hot water supply, and there is a concern that hot water will blow out.

  Therefore, in the water and hot water supply hose of the present invention, the reinforcing layer is divided into an inner reinforcing layer and an upper outer reinforcing layer. That is, the braided reinforcing layer of the metal hard wire described above is used as an outer reinforcing layer, and an inner reinforcing layer is separately provided below the outer reinforcing layer in order to fill the gaps in the metal hard wire and prevent blowout. .

Hereinafter, specific examples of preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a partially sectional perspective view showing an example of a water / hot water hose according to the present invention. That is, the water and hot water supply hose has an inner layer 1, an inner reinforcing layer 2, an outer reinforcing layer 4 and a covering layer 5 in order from the inner side, and has a hose inner diameter of 10 mmφ and a hose thickness of 1.75 mm.

  The inner layer 1 has a two-layer structure. The innermost surface 1A in contact with water or hot water is a polybutene resin having a thickness of 0.25 mm, and a polyolefin elastomer is laminated on the outer surface 1B so that the inner layer 1 has a thickness of 1. 0 mm. Therefore, it has flexibility while supporting tap water containing chlorine.

  The upper side of the inner layer 1 is a cylindrical inner reinforcing layer 2 made of a woven fabric made of polyester fiber yarn. The thickness of the fiber yarn is 1100 denier, and the number of twists is as small as 3/10 cm. Therefore, when the inner reinforcing layer 2 is not thickened and is wound on the upper side of the inner layer 1, the fiber yarn spreads horizontally and becomes flat, and the inner reinforcing layer 2 becomes thin and has no gap. In this example, the inner reinforcing layer 2 and the inner layer 1 are not bonded.

  The inner reinforcing layer 2 has a structure in which the inner layer 1 is covered and the edges thereof are butted, but the inner edges may be overlapped or the inner layer 1 may be wound endlessly. May be.

  The outer reinforcing layer 4 is an outer reinforcing layer 4 made of braided stainless steel hard wire for springs. The wire diameter of the metal hard wire is 0.29 mm, the braid density is 20%, and the braiding angle is 56 °. The outer reinforcing layer 4 does not cause kinks even when bent to a small radius.

  On the upper side of the outer reinforcing layer 4, a jacket layer 5 made of a styrene-based thermoplastic resin is further provided. The jacket layer 5 protects the hard metal wire constituting the outer reinforcing layer 4 and prevents the hard metal wire from being damaged.

  The water / hot water supply hose according to the present invention includes an inner layer made of an elastic tube, an inner reinforcing layer made of a woven fabric or a knitted fabric covering the upper side of the inner layer, and an outer reinforcing made of a metal hard wire braided on the upper side of the inner reinforcing layer. Since it has a layer, it can be bent easily even with a small radius, and there is no occurrence of kinks. Therefore, it can be constructed even in a narrow piping space, ensuring ease of construction and improved durability, and excellent balance of bending rigidity, kink resistance and productivity.

  In particular, by using a tubular body made of woven or knitted fabric as the inner reinforcing layer, the spiral dedicated machine is not required, and of course, the presser thread is not required, and there is no disturbance of the fibers in the inner reinforcing layer, and a thin wall thickness is sufficient. Therefore, it is possible to maintain a necessary water passage diameter by securing a sufficient pressure resistance, being flexible and resistant to bending due to an external force.

FIG. 1 is a partially sectional perspective view showing an example of a water / hot water supply hose according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Inner layer 2 ... Inner reinforcement layer 4 ... Outer reinforcement layer 5 ... Outer coating layer

Claims (4)

  A hose used for piping for water supply or hot water supply, comprising an inner layer 1 made of an elastic tube, and an inner reinforcing layer 2 formed by covering the upper side of the inner layer 1 with a strip-like fiber in a cylindrical shape, and braiding the upper side A hose for hot and cold water supply, characterized in that an outer reinforcing layer 4 made of hard wire is formed.   The hose for hot and cold water supply according to claim 1, wherein the belt-like fibers that are the inner reinforcing layer 2 are woven fabric or knitted fabric.   The hose for hot and cold water supply according to claim 1 or 2, wherein the upper side of the inner layer (1) is wound with a belt-like fiber to form an inner reinforcing layer (2).   The hose for hot and cold water supply according to any one of claims 1 to 3, wherein the belt-like fibers constituting the inner reinforcing layer 2 are polyester or nylon.

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