JPH1122869A - Resin hose for calorifier and resin hose assembly for calorifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enrich flexibility, and smoothly obtain a curved shape by covering an outer periphery of an elastic resin tube with a reinforcing layer by braiding a metallic steel wire and synthetic fiber yarn, and arranging a covering layer on its outer periphery. SOLUTION: A resin hose 1 is formed of a resin tube 2, a reinforcing layer 5 to cover its outer periphery by braiding a metallic steel wire 3 and synthetic fiber yarn 4 and a covering layer 6 to further cover its outer periphery. A material having a low adhesive property is used as the resin tube 2 so that an interface with the reinforcing layer 5 can slide, and the resin hose 1 can be smoothly bent by small force. A material which has physical properties (weatherability and heat resistance) almost equal to the resin tube 2 and has a high adhesive property with the reinforcing layer 5, is used as the covering layer 6. Therefore, the steel wire of the reinforcing layer prevents deformation, and since the tube and the reinforcing layer are not adhered together, when the hose is bent, dislocation is caused between the tube and the reinforcing layer, and it smoothly bends, and a kink can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a resin hose for a water heater and a resin hose assembly for a water heater. More specifically, the present invention relates to a flexible resin hose suitable for piping of tap water and hot water used in a water heater, and a resin hose assembly for a water heater.

[0002]

2. Description of the Related Art As shown in FIG. 6, a water heater discharges mixed water of tap water sent from a water supply valve 51 and hot water sent from a hot water valve 52 as appropriate hot water by adjusting an operation lever 50. The water is discharged from the port 53, and a resin hose 54 is used for piping of the water heater. In the resin hose 54 for the water heater, the tube material of the inner surface layer conforms to the sanitary standards, can withstand the temperature change of the cold and hot water, the mouthpiece 55 has a sealing property, and is not damaged even if it is stuck on a rat. Structure is required. Recently, in addition to such demands, so-called kinks as shown by the arrow K have been prevented in order to make the installation work easy and the piping space narrow, so that a smooth curved shape can be obtained and the flow rate is secured. There is a need for a resin hose that can be made.

As such a resin hose, there is a structure (resin hose A) in which a tube made of synthetic rubber or a thermoplastic resin is braided with a stainless steel wire and reinforced. As another resin hose, a tube made of a thermoplastic resin was braided with synthetic fiber yarns, reinforced, a thermoplastic resin was coated on the tube for protection, and a coiled spring was inserted into the tube. There is a structure (resin hose B).

[0004]

However, in the resin hose A, since the stainless steel wire is tightly wound around the tube, there is a problem that the bending elasticity is too strong and the installation work becomes difficult. Connection fittings are fastened to both ends of the resin hose A. However, since the entire surface of the hose is covered with a stainless steel wire and is strong, a large fitting is required. In addition, there is a problem that the hose becomes heavier and the piping space becomes wider due to the large fitting.

On the other hand, the resin hose B is a slimer hose than the resin hose A because the fitting to be fastened can be reduced in size. However, since the spring is inserted into the tube, the flow rate is reduced, and there is a possibility that the rat may be stuck. In order to increase the flow rate, it is necessary to increase the diameter of the hose. However, in this case, there is a problem that the connection fitting becomes large and the piping space becomes large.

SUMMARY OF THE INVENTION In view of the circumstances described above, an object of the present invention is to provide a resin hose for a water heater, which is flexible and has a smooth curved shape so that handling of piping work can be facilitated.

[0007]

A resin hose for a water heater according to the present invention is a resin hose used for piping of a water heater, comprising a resin tube having elasticity and a metal steel wire coated on the outer periphery of the tube. And a reinforcing layer in which synthetic fiber yarns are braided, and a coating layer which covers the outer periphery of the reinforcing layer.

Alternatively, the resin hose assembly for a water heater according to the present invention is characterized in that fittings for coupling to a mating member are fastened to both ends of the resin hose.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A resin hose for a water heater and a resin hose assembly for a water heater according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partial cross-sectional perspective view showing an embodiment of a resin hose for a water heater according to the present invention, FIG. 2 is an explanatory view showing a manufacturing process of the resin hose for a water heater in FIG. 1, and FIG.
FIG. 4 is an explanatory view showing a manufacturing process of a mixed thread bobbin used in the manufacturing process in FIG. 4, FIG. 4 is an explanatory view showing a manufacturing process of a connecting fitting, and FIG. It is a perspective view showing one embodiment of a fastened resin hose.

As shown in FIG. 1, a resin hose 1 includes a resin tube 2, a reinforcing layer 5, which is coated on the outer periphery of the tube 2, and is braided with a metal steel wire 3 and a synthetic fiber thread 4. It is composed of a coating layer 6 coated on the outer periphery of the layer 5.

The resin tube 2 is made of an elastic resin in order to conform to the sanitary test for water supply and to maintain the sealing performance of the connection fitting.
According to the test method specified in 6262, compression set is 30%
It is a resin having the following physical properties and hardness of about Shore A80. In order to smoothly bend the resin hose 1 with a small force, the interface between the resin tube 2 and the reinforcing layer 3 needs to be slipped, so that a material having low adhesiveness is desirable.
In the present invention, the material having low adhesiveness is a material having a small peeling force of less than 0.1 kg in a 25 mm width measured according to the vulcanized rubber adhesion test method JIS-6256. Among them, for example, considering cost, PP (polypropylene) and EP
It is preferable to use a dynamically crosslinked resin (trade name: Santoprene, manufactured by Mitsubishi Monsanto Kasei Co., Ltd.) which is a mixture of T (ethylene / polypropylene / terpolymer).

When the resin hose 1 shown in FIG. 1 is bent, a metal steel wire 3 is braided on the reinforcing layer 5 to prevent the resin tube 2 from breaking (kinking).
As the metal steel wire 3, an SS-plated steel wire, a stainless steel wire, or the like can be used, but the kink prevention of the hose, the flexibility, the weight reduction, the slimness of the hose due to the thinning of the connection fitting, and the long-term use Considering the permeation of moisture by
φ0.3mm stainless steel wire (SUS304WPB)
Is suitable. The reinforcing layer 5 in which 24 stainless steel wires are braided has a sufficient pressure resistance, but the adhesion between the stainless steel wire and the coating layer 6 is low. As a result, when a tensile test is performed on the fitting of the hose assembly in which the fitting is attached to the hose, the value becomes low at the time of heating. Therefore, after the synthetic fiber yarn 4 is braided, the adhesive is permeated and the coating layer is formed. The reinforcing layer 5 and the covering layer 6 are integrated by strong adhesion to the reinforcing layer 5. Considering the permeability of the adhesive, the synthetic fiber yarn 4 is desirably a vinylon yarn, a nylon yarn or a polyester yarn having a denier of 1,000 to 1,200.

The coating layer 6 is a material having substantially the same physical properties (weather resistance and heat resistance, etc.) as the resin tube 2, but has a high adhesiveness to the reinforcing layer 15 and a 3 kg width of 25 mm.
Having the above peeling force, for example, a peeling force of 4.3 kg,
For example, it is preferable to use a urethane-based thermoplastic resin or the like.

In the present embodiment, even if the hose is bent to a radius of about 30 mm, the steel wire of the reinforcing layer prevents deformation and the tube and the reinforcing layer are not bonded. Due to the displacement of the reinforcing layer, the reinforcing layer is smoothly bent and no kink is generated.

Next, a procedure for manufacturing a resin hose for a water heater will be described. First, as shown in FIG. 2, the dynamic cross-linking resin was extruded at an inner diameter of 8.8 mm and a thickness of 1.
The tube is extruded into a shape of 3 mm and an outer diameter of φ11.4 mm to form a tube.

Next, as shown in FIG. 3, a stainless steel wire (φ0.3 mm) 3a and a vinylon yarn (1,200 denier) 4a are pulled out from each reel and wound around 24 bobbins 9 by a winder 8. .

Then, as shown in FIG.
After setting the four bobbins 9 on the carrier of the braided braider 10, the braid pitch 26.5 mm and the braid outer diameter φ
Braiding to 12.6 mm to form a reinforcing layer on the outer circumference of the tube.

Next, a solvent type urethane-based adhesive is uniformly applied on the formed reinforcing layer, dried with hot air, and coated with a urethane-based thermoplastic resin to a thickness of 0.4 mm by an extruder 11, A resin hose having an outer diameter of 13.4 mm is obtained.

In the present invention, connection fittings can be fastened to both ends of the resin hose 1.

Next, the fastening of the resin hose and the connection fitting will be described. First, as shown in FIGS. 4A to 4C, the inner diameter is φ6.5 mm, and the insertion outer diameter is φ8.9 m.
After inserting a stainless steel outer bracket 13 having an inner diameter of φ14.0 mm and an outer diameter of φ15.0 mm into the brass nipple 12 having a diameter of 1 m, one end 13 a of an insertion portion is caulked and fastened to the nipple 12. The outer tube fitting 13 is integrated, and a connection fitting 14 is prepared.

Next, after cutting the resin hose 1 to a predetermined length, as shown in FIG. 5, the connection fittings 14 are inserted into both ends thereof, and the outer cylindrical portion of the fitting 14 is caulked. A resin hose assembly with a fitting having an outer diameter of φ13.5 mm can be obtained by fastening.

As described above, in the resin hose assembly in which the fittings are fastened to both ends of the hose, even in the tensile test at a temperature of 100 ° C., since the coating layer and the reinforcing layer are firmly adhered to each other, the holding force of 130 kgf / cm ² or more is maintained. It was found to have power.

As shown in the table, the resin hose assembly with the fitting of the present invention (Example) is different from the conventional resin hose A (Comparative Example 1) and the conventional resin hose B (Comparative Example 2) in each item. As can be seen from the comparison, it has excellent performance.

[0025]

[Table 1]

In the present invention, since a resin having elasticity is used for the tube and the coating layer, a thin material can be used for the connection fitting. In particular, since the thickness of the outer metal fitting functions at 0.5 mm, a slim resin hose assembly can be manufactured.

[0027]

As described above, according to the present invention,
The metal steel wire of the reinforcing layer made of braided metal steel wire and synthetic fiber yarn strengthens the repulsion force against the hose bending in the piping work, so that kink is prevented, a smooth curved shape is obtained, and the piping work is reduced. It can be done easily.

Further, since a slip occurs at the interface between the resin tube having low adhesiveness and the reinforcing layer, the bending stress at the time of bending the hose is reduced, and the handling of the hose piping work can be facilitated.

Further, since it is not necessary to insert a spring for preventing kink, the flow rate is increased to 22 liters per minute, and both the outer diameter of the hose and the fastening diameter of the fitting are φ.
Since the diameter can be reduced to 13.5 mm or less, a slim hose can be obtained, and a compact hose pipe that does not take up much space can be provided.

[Brief description of the drawings]

FIG. 1 is a partial sectional perspective view showing one embodiment of a resin hose for a water heater of the present invention.

FIG. 2 is an explanatory view showing a manufacturing process of the resin hose for a water heater in FIG.

FIG. 3 is an explanatory view showing a process of manufacturing a mixed yarn bobbin used in the manufacturing process in FIG.

FIG. 4 is an explanatory view showing a manufacturing process of a connection fitting.

FIG. 5 is a perspective view showing one embodiment of a resin hose assembly in which connection fittings are fastened to both ends of a resin hose for a water heater in FIG. 1;

FIG. 6 is an explanatory diagram showing an example of a water heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin hose 2 Resin tube 3 Metal steel wire 4 Synthetic fiber yarn 5 Reinforcement layer 6 Coating layer

Claims (6)

[Claims] 1. A resin hose used for piping of a water heater, comprising: a resin tube having elasticity; a reinforcing layer which is braided with a metal steel wire and a synthetic fiber yarn, which is coated on an outer periphery of the tube; A resin hose for a water heater comprising a coating layer coated on the outer periphery of a reinforcing layer. 2. The resin hose according to claim 1, wherein the resin tube is formed of a resin having low adhesiveness. 3. The resin hose according to claim 2, wherein the resin having low adhesiveness is a dynamically crosslinked resin. 4. The resin hose according to claim 1, wherein said coating layer is formed of a resin having high adhesiveness. 5. The resin hose according to claim 4, wherein the resin having high adhesiveness is a urethane resin. 6. A resin hose assembly for a water heater, wherein a fitting for coupling to a mating member is fastened to both ends of the resin hose according to claim 1.