JP2016003745A - Heat insulation hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulation hose which is capable of presenting predetermined heat insulation effects by preventing a gap from being generated between heat insulation materials forming a heat insulation layer even if the heat insulation hose is bent, capable of significantly reducing intra-tube resistance, and also capable of preventing the heat insulation materials from jumping out of a cut area even if the heat insulation hose is cut.SOLUTION: A heat insulation hose A includes: inner and outer tubes 1 and 4 each formed from a soft vinyl-chloride resin; a reinforcing core wire 2 spirally wound on the inner tube 1 and formed from a hard vinyl-chloride resin; and a heat insulation layer 3 provided between the inner and outer tubes 1 and 4 and formed from a foamed polyethylene resin. When the heat insulation hose is bent while narrowing a gap between the neighboring reinforcing core wires 2 and 2, the intra-tube resistance can be significantly reduced. In the state where two reinforcing core wires 2 are recessed and locked into belt-like heat insulation materials 3a forming the heat insulation layer 4, satisfactory heat insulation effects or the like can be presented.

Description

  The present invention relates to a heat insulating hose used as a drain hose for an air conditioner or a duct hose for other various devices.

  Conventionally, as a heat insulating hose, a heat insulating material made of foamed resin is interposed between a thin inner tube made of soft synthetic resin and an outer tube, and a reinforcing core wire made of hard resin is spirally formed on the outer peripheral surface of the inner tube. The thing of the structure formed by winding is widely known. For example, in Patent Document 1, a hollow spiral ridge made of a soft vinyl chloride resin in which a hard reinforcing core wire having an elliptical cross section made of polypropylene resin is included on the outer peripheral surface of an inner tube made of soft vinyl chloride resin is formed. In addition, a band-shaped heat insulating material made of a polyethylene foam resin is formed on the outer peripheral surface of the inner pipe, while the opposing surfaces of the heat insulating material portion wound first and the heat insulating material portion wound next are joined together. A heat insulating hose is described in which a heat insulating layer is formed by winding in a shape and the outer peripheral surface of the heat insulating layer is covered with an outer tube made of polyethylene resin.

  Patent Document 2 discloses an inner tube made of a soft vinyl chloride resin, a hard reinforcing core wire having a circular cross section made of a polypropylene resin spirally wound on the inner tube, and a foamed polyethylene resin on the inner tube. The reinforcing core wire is composed of a heat insulating layer formed by spirally winding a band-shaped material while joining the opposite side end surfaces to each other, and an outer tube made of a soft vinyl chloride resin covering the heat insulating layer. Describes a heat-insulating hose having a structure in which a coating layer made of soft vinyl chloride is provided on the outer periphery and the coating layer is adhered to an inner tube.

JP 7-174292 A JP-A-9-229242

  However, according to the former heat insulating hose, since the outer tube is formed of polyethylene resin and integrally heat-sealed to the outer peripheral surface of the homogeneous heat insulating layer, when the heat insulating hose is cut, the heat insulating layer from the cut end However, since polyethylene resin has poor adhesion, it is difficult to attach a bonding member for bonding to equipment such as an air conditioner by bonding. Become. Furthermore, since the heat insulating hose and the outer tube are integrated, there is a risk that the bending resistance of the heat insulating hose will increase and hinder the flexibility, and in addition, it is wound spirally on the inner tube. Since the hard reinforcing core wire is contained in the hollow spiral ridge formed on the outer peripheral surface of the inner tube without adhering to the inner tube, the reinforcing core wire is hollow when the heat insulating hose is bent or stepped on. There is a possibility that the hollow spiral ridge and the inner pipe may be damaged due to reluctance in the radial direction and the length direction of the hose within the spiral ridge.

  On the other hand, according to the latter heat insulating hose, both the inner and outer pipes are made of a soft vinyl chloride resin, so that it is possible to attach a joining member for joining to equipment such as an air conditioner by adhesion and good flexibility. In addition, since the reinforcing core wire is fixed to the inner tube, the reinforcing core wire will not move even if the heat insulating hose is bent, etc., but the reinforcing core wire has a pitch equal to the width of the strip-shaped heat insulating material forming the heat insulating layer. Therefore, since it is spirally wound on the inner pipe, one reinforcing core wire spirally wound on the inner pipe is locked while the inner surface of the belt-shaped heat insulating material is recessed while being recessed. , The holding power against the heat insulating material due to locking is weak, and when the heat insulating hose is bent, the heat insulating material may move away, and a gap may be generated between the opposed surfaces of the heat insulating material, thereby reducing the heat insulating function. , Also insulated ho When cut to the desired lengths, there is a possibility that an end portion of the heat insulating material pops out from the locking is solved cut opening of the reinforcing core.

  In addition, the reinforcing core wire is formed in a circular cross section, and the reinforcing core wire is covered with a soft vinyl chloride coating layer having the same quality as the inner tube, and the coating layer is integrated with the inner tube by heat fusion or the like. Since it is bonded, the adhesive strength with the inner tube is weak, and there is a problem that when the hose is bent or the like, it peels off from the inner tube and cannot hold the heat insulation layer.

  Furthermore, as described above, since the reinforcing core wire is spirally wound on the inner tube at a pitch substantially equal to the width of the heat insulating material, the width of the inner tube portion between the reinforcing core wires adjacent in the length direction of the heat insulating hose is When the heat insulating hose is bent, the space between adjacent reinforcing cores is greatly narrowed, and the inner tube portion existing in this space is suspended in a V shape or U shape in the inner diameter direction of the hose. However, there is a problem in that the resistance to the fluid flowing in the hose increases and the smooth flow is prevented. Such a problem also occurs in the heat insulating hose of Patent Document 1.

  In addition, in the conventional heat insulating hose, in order to increase the holding force against the heat insulating material and form a stable heat insulating layer, the height of the reinforcing core wire spirally wound on the inner tube is set to the thickness of the heat insulating layer. Although the height reaches 1/2, the heat insulating material is greatly immersed and locked, but in this case, the heat insulating layer covering the reinforcing core wire becomes thin and the heat insulating function is lowered. When the thickness of the heat insulating layer is increased to eliminate the problem, the diameter of the heat insulating hose is inevitably increased, which hinders piping work.

  This invention is made | formed in view of such a problem, The place made into the objective is to provide the heat insulation hose which can eliminate a trouble, providing the advantage of the said conventional heat insulation hose.

  In order to achieve the above object, the heat insulating hose according to the present invention comprises an inner tube made of a soft vinyl chloride resin and a reinforcing core spirally wound on the inner tube at a constant pitch as described in claim 1. A heat insulating layer formed by spirally winding a strip-shaped heat insulating material having a quadrangular cross section made of foamed polyethylene resin on the inner tube while joining the opposite side end surfaces to each other, and a soft covering the heat insulating layer In the heat insulating hose comprising an outer tube made of vinyl chloride resin, the reinforcing core wire is made of hard vinyl chloride resin and is integrally fixed to the inner tube made of soft vinyl chloride resin by heat fusion and adjacent to the inner tube. The inner surface of the strip-shaped heat insulating material is set so that the interval between the opposing side surfaces of the reinforcing core wire is 1.5 to 2.5 times the width of the reinforcing core wire and the pitch of the reinforcing core wire is ½ or less of the width of the strip-shaped heat insulating material. Two reinforcing core wires are immersed and locked in at least two places, and the height of the reinforcing core wires is formed to be 4/10 to 3/10 of the heat insulation thickness. To do.

  In the heat insulating hose configured as described above, the invention according to claim 2 sets the pitch of the adjacent reinforcing core wire spirally wound on the inner pipe to an interval of 1/2 to 1/3 of the width of the strip-shaped heat insulating material. It is characterized by being.

  Furthermore, the invention according to claim 3 is characterized in that the reinforcing core wire is formed to have a quadrangular cross section or a triangular shape so as to widen the heat fusion area with the outer peripheral surface of the inner tube.

  According to the first aspect of the invention, the heat insulating hose includes an inner tube, a reinforcing core wire spirally wound on the inner tube at a constant pitch, and a strip-shaped heat insulating material having a rectangular cross section on the inner tube. It consists of a heat insulating layer formed by spirally winding the opposite side end faces and an outer tube covering the heat insulating layer, and the inner tube and the outer tube are made of a soft vinyl chloride resin. Therefore, since the reinforcing core wire is made of hard vinyl chloride resin, it can be easily attached to the end portion of the hose by joining an air conditioner or other equipment. It can be integrally heat-sealed to the inner tube, and even if the heat insulating hose is bent, the reinforcing core wire does not move, and the cross-sectional square shape is made of a foamed polyethylene resin spirally wound on the inner tube. Strip insulation material to the side end faces of the opposing can be held so as to come into contact with the close contact state, it is possible to prevent drop of heat insulating function by gap generation.

  Furthermore, according to the present invention, the interval between the side surfaces of the reinforcing core wires facing each other in the reinforcing core wire spirally wound on the inner tube is 1.5 to 2.5 times the width of the reinforcing core wire. Therefore, it is possible to prevent crushing deformation even when it is stepped on unexpectedly because the pressure strength is increased, and the distance between adjacent reinforcing cores when the heat insulating hose is bent is reduced. It is possible to eliminate the narrowing of the inner pipe portion between the adjacent reinforcing cores and the deformation of the inner hose toward the inside of the hose, thereby reducing the resistance (pressure loss) to the fluid flowing in the heat insulating hose. It can be greatly reduced, and smooth distribution can be achieved even in the bent portion.

  In addition, the pitch of the reinforcing core wire is set to be 1/2 or less of the width of the strip-shaped heat insulating material having a rectangular cross section spirally wound on the inner pipe, so that the outer peripheral surface of the inner pipe is Reinforcement core wires are disposed in at least two locations on the inner surface of the strip-shaped heat insulating material in contact with the inner surface so that they are immersed and locked. Even when the hose is bent while being restrained by the reinforcing core wire, it is possible to suppress the generation of a gap between the side end surfaces joined to each other of the band-shaped heat insulating material, and to form a stable heat insulating layer that exhibits an excellent heat insulating effect Can do.

  Moreover, since the inner surface of the strip-shaped heat insulating material is supported by at least two reinforcing core wires as described above, when the heat insulating hose is cut, the jumping out of the cut surface is suppressed by these reinforcing core wires so that it is difficult to jump out. In addition, since the height of the reinforcing core wire is formed to be 4/10 to 3/10 of the thickness of the heat insulation, the size of the reinforcing core wire is relatively small and can be easily cut. The thickness of the heat insulating layer covering the reinforcing core wire can be increased accordingly, and a heat insulating hose that exhibits an excellent heat insulating effect without increasing the diameter of the heat insulating hose can be provided. The piping work can be performed without any trouble.

  According to the invention of claim 2, since the pitch of the reinforcing core wire spirally wound on the inner pipe is set to 1/2 to 1/3 of the width of the strip-shaped heat insulating material, it faces the outer peripheral surface of the inner pipe. The heat insulating layer has a structure in which reinforcing core wires are disposed at two or three positions on the inner surface of the belt-like heat insulating material, and thus the heat insulating hose is held stably by these reinforcing core wires without impairing the flexibility of the heat insulating hose. A heat insulating hose having

  According to the invention of claim 3, since the reinforcing core wire is formed in a quadrangular section or a triangular shape in cross section, the heat fusion area of the reinforcing core wire to the inner tube is increased, and the reinforcing core wire is placed on the inner tube. Even if the heat insulating hose is bent or compressed and deformed, it does not peel off from the outer peripheral surface of the inner tube, and the belt-shaped heat insulating material is always kept stable. The area of engagement between the side surfaces of the reinforcing core wire having a quadrangular or triangular cross section facing the hose length direction and the belt-shaped heat insulating material is large, and the helix length of the belt-shaped heat insulating material can be firmly prevented from moving. It is possible to form a heat insulating layer that can maintain a state in which the belt-shaped heat insulating material is spirally wound in the length direction of the hose without a gap and exhibits an excellent heat insulating action.

The perspective view of the state which excised a part of this invention heat insulation hose in the length direction. The front view of the heat insulation hose which cut through a part. The expanded sectional view of the one part. Sectional drawing of a part of heat insulation hose which uses the cross-section triangle-shaped reinforcement core wire. The simplified front view which shows a manufacturing method.

  Next, a specific embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 to 3, the heat insulating hose A includes a thin inner tube 1 made of a soft vinyl chloride resin and a constant thickness on the inner tube 1. A reinforcing core wire 2 made of a hard vinyl chloride resin spirally wound at a pitch of 2 mm, and a rectangular cross section made of a foamed polyethylene resin on the inner tube 1 so as to cover the reinforcing core wire 2 with a part of its inner surface. The heat insulating layer 3 formed by spirally winding the belt-shaped heat insulating material 3a while joining the opposing side end surfaces to each other, and the thin outer tube 4 made of a soft vinyl chloride resin covering the heat insulating layer 3 It consists of and.

  The reinforcing core wire 2 made of the hard vinyl chloride resin spirally wound around the outer peripheral surface of the inner tube 1 is formed in an elongated bar shape having a square cross section, and is a surface that is in direct contact with the outer peripheral surface of the inner tube 1. The inner surface is integrally fixed to the outer peripheral surface of the inner tube 1 by heat fusion. The outer surface, which is the top surface of the reinforcing core wire, is formed as a convex arcuate curved surface. Further, the interval between the opposing side surfaces of adjacent reinforcing core wires, that is, the reinforcing core wire portion 2a wound in a spiral in advance on the inner tube 1, and the spiral winding after the reinforcement core wire portion 2a. The distance between the opposite side surfaces of the reinforcing core wire portion 2a is the width (thickness) between both side surfaces of the reinforcing core wire 2, specifically, the width of the inner surface of the reinforcing core wire 2 that is thermally fused to the inner tube 1. The pitch is 1.5 to 2.5 times, preferably 2 times, and the pitch of the reinforcing core wire 2 is set to 1/2 or less, preferably 1/2 to 1/3 of the width of the strip-shaped heat insulating material. .

  For example, when obtaining a heat insulating hose having an inner diameter of 25 mm and an outer diameter of 36 mm, a reinforcing core wire 2 having a height and width of 1.5 mm is used, and the reinforcing core wire 2 is placed on the inner tube 1 at a pitch of 4.5 mm. Thus, the space between the adjacent reinforcing core wires 2 and 2 wound spirally, that is, the interval between the opposing side surfaces of the first reinforcing core portion 2a and the next reinforcing core portion 2a is reinforced. It is 3 mm which is twice the width of the core wire 2, and the width of the strip-shaped heat insulating material 3 a is set to 2 to 3 times the pitch of the reinforcing core wire 2, preferably 9 mm which is twice the pitch. The two reinforcing core wires 2 and 2 adjacent to each other on the inner surface of the strip-shaped heat insulating material 3a in contact with the inner tube 1 are immersed and locked into the strip-shaped heat insulating material 3a from the inner surface of the strip-shaped heat insulating material 3a. Naturally, when the width of the strip-shaped heat insulating material 3a is three times the pitch of the reinforcing core wire 2, the three reinforcing core wires 2, 2, and 2 are arranged in parallel with the pitch interval therebetween. It is disposed in a state of being immersed and locked on the inner surface of the heat insulating material 3a.

  Thus, a constant pitch is formed on the inner surface of the strip-shaped heat insulating material 3a spirally wound in each spiral in the heat insulating layer 3 spirally wound with the side surfaces facing the outer peripheral surface of the inner tube 1 being joined. 2 to 3 reinforcing core wires 2 arranged side by side are arranged in a state of being immersed and locked, and accordingly, in the hose length direction of the strip-shaped heat insulating material 3a spirally wound on the inner tube 1 Even when the hose is bent with the reinforcing core wires 2 being prevented from reluctance, the generation of gaps between the side surfaces of the strip-shaped heat insulating materials 2 and 2 joined to each other can be suppressed, and an excellent heat insulating effect can be obtained. The stable heat insulating layer 3 can be formed, and even when the heat insulating hose is cut, the jumper of the strip-shaped heat insulating material 3a from the cut surface can be suppressed by these reinforcing core wires 2.

  In addition, when the pitch of the reinforcing core wire 2 is increased, when the hose is bent due to a decrease in strength, the bent portion may be compressed and deformed in a flat shape, and the inner tube portion between the adjacent reinforcing core wires 2 and 2 When the hose is bent when the width of the hose is widened, this portion loosens and deforms toward the inside of the hose, and the resistance in the pipe increases. On the other hand, if the pitch of the reinforcing core wire 2 is reduced, the bending resistance increases. In this way, the pitch is set such that the distance between the opposing side surfaces of the adjacent reinforcing core wires 2 and 2 is 1.5 to 2.5 times the width of the reinforcing core wires.

  Furthermore, the height between the inner and outer surfaces of the reinforcing core wire 2 is the thickness between the inner and outer surfaces of the strip-shaped heat insulating material 3a, that is, the heat insulating layer 3 formed by spirally winding the band-shaped heat insulating material 3a on the inner tube 1. The thickness of the strip-shaped heat insulating material 3a covering the reinforcing core wire 2, ie, the outer surface (the top) of the reinforcing core wire 2 is set to a height of 4/10 to 3/10, preferably about 1/3 of the thickness. Surface) and the outer surface of the strip-shaped heat insulating material 3a are formed so that the thickness of the strip-shaped heat insulating material 3a is relatively large and a predetermined heat insulating effect can be obtained without increasing the outer diameter of the heat insulating hose. Note that if the height of the reinforcing core wire 2 is 4/10 or more of the thickness of the heat insulating layer 3, the heat insulating effect is impaired, and it becomes difficult to cut the heat insulating hose. It is not preferable because buckling occurs when bent or the like and hinders piping work.

  In the above embodiment, a core wire having a square cross section is used as the reinforcing core wire 2, but a reinforcing core wire 2 'having a triangular cross section may be used as shown in FIG. In this case, the width of the reinforcing core wire 2 ′ refers to the width of the bottom surface heat-sealed on the inner tube 1. In short, in a state where the reinforcing core wires 2 and 2 'are immersed and locked from the inner surface of the strip-shaped heat insulating material 3a, the both side surfaces of the reinforcing core wires 2 and 2' are recessed due to the immersion of the reinforcing core wires 2 and 2 '. What is necessary is just to form it so that it may become a wide locking surface which presses the dent part of the heat insulating material 3a entirely, and prevents the strip | belt-shaped heat insulating material 3a from making a delusion in the length direction of a hose. Since other configurations are the same as those of the above-described embodiment, the same portions are denoted by the same reference numerals and detailed description thereof is omitted.

  Next, a method of manufacturing the heat insulating hose A configured as described above will be described with reference to FIG. 5. A thin strip 1 a made of soft vinyl chloride resin in a semi-molten state having a certain width is extruded from the first molding nozzle 11. On the other hand, the other side end of the following strip 1a is superposed on the one end of the preceding strip 1a on the molding rotating shaft 10 and is wound in a spiral at a constant pitch while being fused together. As a result, a thin inner tube 1 made of a soft vinyl chloride resin is formed, and a rectangular cross section made of a hard vinyl chloride resin semi-molten from the second molding nozzle 12 is formed on the outer peripheral surface of the inner tube 1. Two thin rod-shaped reinforcing core wires 2 are pushed out in a state where they are aligned in parallel at a certain interval, and then wound around these aligned reinforcing core wires 2 and 2 that are wound in a single turn first. Alignment reinforcing core wires 2 and 2 wound in the shape of Fusing together the outer peripheral surface of the inner tube 1 and the inner surface (bottom surface) of the reinforcing core wires 2,2 by winding device helically with a come alignment pitch the same pitch of the reinforcing wire 2,2.

  In this way, the inner tube 1 is continuously fed on the molding rotary shaft 10 toward the tip end side of the molding rotary shaft 10 while spirally winding the reinforcing core wires 2 and 2 on the inner pipe 1 at a constant pitch. On the way, from the foamed polyethylene resin in which the width between both side surfaces is twice as wide as the pitch between the adjacent reinforcing core wires 2 and 2 and the thickness is approximately three times the height of the reinforcing core wires 2. The opposite end surfaces of the heat insulating material portion wound in a single turn on the inner tube 1 and the heat insulating material portion wound next in a single turn are abutted against each other. The two reinforcing core wires 2 and 2 are arranged on the inner surface of the heat insulating material portion wound in a single winding shape by spirally winding on the inner tube 1 at a constant pitch while being joined and in close contact with each other. A constant thickness that is immersed and locked in from the inner surface of the heat insulating material 3a. To form a thermal layer 3.

  Further, following the formation of the heat insulating layer 3, the thin molding material 4a made of soft vinyl chloride resin in a semi-molten state having a certain width is extruded from the third molding nozzle 13 on the outer peripheral surface of the heat insulating layer 3. By spirally winding on the outer peripheral surface of the heat insulating layer 3 at a constant pitch while superimposing and fusing together the other end of the following strip 1a on one end of the strip 1a. A thin outer tube 4 is formed.

  The heat insulating hose A manufactured in this way is provided with a heat insulating layer 3 having a certain thickness not bonded to the inner and outer tubes 1 and 4 between the thin inner and outer tubes 1 and 4 made of a soft vinyl chloride resin, and The reinforcing core wire 2 made of hard vinyl chloride resin is spirally wound on the inner tube 1 at a constant pitch, and the two adjacent reinforcing core wires 2 and 2 are spirally wound on the inner tube 1. The belt-shaped heat insulating material 3a has a structure in which the inner surface of each one-band belt-shaped heat insulating material portion is immersed and locked in a biting state.

  In the method for manufacturing the heat insulating hose A, two reinforcing core wires 2 are extruded from the second molding nozzle 12 in a state where they are aligned in parallel at a certain interval, and wound in a single turn first. The alignment reinforcing core wires 2 and 2 wound next around the alignment reinforcing core wires 2 and 2 are spirally wound on the inner tube 1 at the same pitch as the pitch of the alignment reinforcing core wires 2 and 2. However, the inner pipe 1 is arranged so that the pitch between the reinforcing core wires 2 is the same as the pitch between the two reinforcing core wires 2 and 2 aligned as described above. You may spiral up.

A Heat insulation hose 1 Inner pipe 2 Reinforcing core wire 3 Heat insulation layer
3a Strip insulation 4 Outer tube

Claims (3)

  An inner pipe made of a soft vinyl chloride resin, a reinforcing core wire spirally wound on the inner pipe at a constant pitch, and a strip-shaped heat insulating material made of a foamed polyethylene resin on the inner pipe are opposed to each other. In a heat insulating hose comprising a heat insulating layer formed by spirally winding the end faces and an outer tube made of a soft vinyl chloride resin covering the heat insulating layer, the reinforcing core wire is made of a hard vinyl chloride resin. It is integrally fixed to the inner tube made of a soft vinyl chloride resin by heat fusion, and the distance between the opposing side surfaces of adjacent reinforcing core wires is 1.5-2. Two reinforcing core wires are immersed and locked in at least two locations on the inner surface of the strip-shaped heat insulating material, with the pitch of the reinforcing core wire set to 5 times or less of the width of the strip-shaped heat insulating material. Thermal insulation hose a height and wherein the forming the height of 4 / 10-3 / 10 of the thickness of the insulation.   2. The heat insulating hose according to claim 1, wherein the pitch of adjacent reinforcing core wires spirally wound on the inner pipe is set to an interval of ½ to ３ of the width of the belt-shaped heat insulating material.   The heat insulating hose according to claim 1, wherein the reinforcing core wire is formed in a quadrangular cross section or a triangular shape to widen a heat fusion area with the outer peripheral surface of the inner tube.

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