JP3081457U - Water supply piping structure - Google Patents

Abstract

(57) [Summary] [PROBLEMS] The present invention relates to a highly reliable water supply pipe structure that can easily perform piping work, increases the strength and durability of a water supply pipe, and does not cause liquid leakage or the like. The hot water-cold water supply pipe structure includes a water supply pipe having a three-layer structure of an inner pipe made of cross-linked polyethylene, an intermediate pipe made of an aluminum plate, and an outer pipe made of polyethylene or cross-linked polyethylene, and a joint. A plug-in type joint having a connecting pipe portion extending outward from the main body and inserted into the water supply pipe, and a clamp band for tightening the water supply pipe externally fitted to the connection pipe part of the joint to the connection pipe part. It is characterized in that it comprises an ear, a support hook and a clamp having a combined guide and support hook.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an improvement in a water supply pipe structure including a plurality of water supply pipes, a joint for connecting the water supply pipes, and a clamp for fixing the water supply pipes to the joints.

[0002]

[Prior art]

 Conventionally, as a water supply pipe structure for this type of hot / cold water, a water supply pipe having a single-layer structure has been used. For this reason, when connecting the water supply pipe to the plug-in joint type joint, problems such as liquid leakage due to a decrease in the strength and pressure resistance of the water supply pipe have occurred.

[0003]

[Problems to be solved by the invention]

 The present invention has been made in view of the above-mentioned circumstances, and its main problems are to increase the strength and durability of a hot water-cold water supply pipe structure and to provide a highly reliable water supply pipe that does not cause liquid leakage or the like. It is to provide a structure. Another object of the present invention is to provide a water supply piping structure that facilitates piping work.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, according to the invention of claim 1, a water supply comprising a plurality of water supply pipes, a joint for connecting the water supply pipes, and a clamp for fixing the water supply pipes to the joints. A pipe structure, wherein the water supply pipe is formed of a cross-linked polyethylene pipe having a single-layer or multi-layer structure, and a joint having a connecting pipe portion extending outward from the joint body and inserted into the water supply pipe. The clamp has a lug for crimping on the clamp band, and a support hook and a guide hook are provided so that the clamps can be engaged with the respective holes and tightened. Technical measures are taken such that the clamp is externally fitted to the water supply pipe externally fitted to the connection pipe and the connection pipe is tightened. In the invention of claim 2, the water supply pipe has a three-layer structure of an inner pipe made of cross-linked polyethylene, a middle pipe made of an aluminum plate, and an outer pipe made of polyethylene or cross-linked polyethylene. Take steps. In the invention of claim 3, the water supply pipe is an inner pipe formed by heating the pipe and spraying powder crosslinked polyethylene, a middle pipe in which an aluminum plate is adhered on the inner pipe, Technical measures are taken to form a three-layer structure of an outer tube sprayed with powdered polyethylene or powdered crosslinked polyethylene on top. According to the invention of claim 4, the clamp comprises a single clamp band comprising an outer band portion and an inner band portion, and a crimping ear having a substantially inverted U-shaped cross section is provided at an intermediate position of the outer band portion. A combination guide and support hook extending outward and a plurality of support hooks are formed on the inner band portion, and a width corresponding to the combination guide and support hook is formed on the open end of the outer band portion. A narrow slit and a hole corresponding to the support hook are formed, and a narrow tongue extending outward is formed at an end of the inner band portion, and a narrow tongue is formed in the outer band portion. At the halfway position, a step is formed which protrudes outward with a width corresponding to the width of the tongue, and the step completely stores the tongue when the ear is pressed and contracted. Technically, it has a tongue receiving groove It has taken the stage.

[0005]

[Embodiment of the invention]

 Hereinafter, a preferred embodiment in which the hot water-cold water supply pipe structure of the present invention is used as a KASEI (PEC) PEX System (trademark) will be described with reference to the drawings. A water supply piping system (KASEI (PEC) PEX system) 1 shown in FIG. 1 includes a plurality of water supply pipes 2, a joint 3 for connecting the water supply pipes 2, and a fixing means for fixing the water supply pipes 2 to the joints. And a clamp 3.

Here, the water supply pipe 2 is made of a cross-linked polyethylene pipe. In this embodiment, an inner pipe 21 made of cross-linked polyethylene, a middle pipe 22 made of an aluminum plate, and an outer pipe made of polyethylene or cross-linked polyethylene. A three-layer structure of 23 is used.

In the present embodiment, the inner tube 21 is formed of a pipe formed of cross-linked polyethylene, and is formed into a tubular shape by heating a pipe serving as a mold and spraying powder cross-linked polyethylene. An aluminum plate is bonded onto the inner tube 21 to form a middle tube 22, and the outer tube 23 is formed on the middle tube 22 by spraying powdered polyethylene or powder crosslinked polyethylene.

The water supply pipe 2 is shown in the illustrated example as extending linearly, but may be set to be bent and meander appropriately in accordance with the piping configuration. The water supply pipe 2 connects a plurality of water supply pipes 2, 2,.

The joint 3 is made of brass, and has a known shape having a joint body 31 and connection pipes 32, 32,... Connected to the joint body 31. In the illustrated example, an elbow pipe 3 ′ for changing the direction of the water supply pipes 2 and 2 to a right angle and a T-shaped pipe 3 ″ branching in two directions are used, but a straight pipe connecting the water supply pipes 2 and 2 in the same direction. (Not shown), or any other known joint shape.

A clamp 4 is used for tightening the water supply pipe 2 externally fitted to the connection pipe part 32 of the joint 3 to the connection pipe part 32. In the present embodiment, a stepless clamp made of stainless steel for one ear, for example, a structure of Japanese Patent No. 1823699 or a structure of US Pat. No. 5,390,395 (Chinese Patent 94 112 913.6) is used. That is, in the present embodiment, the clamp 4 forms one ear 42 at an intermediate position of the clamp band 41 wound around in a ring shape, and also includes a support hook 43 and a combined guide and support hook 44 as an example of the guide hook. Are provided.

That is, the clamp 4 is composed of a single clamp band 41 having an open end, and has one lug 42 having a substantially inverted U-shaped cross section at an intermediate position. In addition, the clamp band 41 includes an outer band portion 41a that becomes the outer side when the clamp band is wound and an inner band portion 41b that becomes the inner side. A guide / support combination hook 43 and a plurality (two in the illustrated example) of support hooks 44 extending outward are formed on the inner band portion 41b, and the hook 43 is provided at the open end of the outer band portion 41a. A plurality of (two in the illustrated example) holes 45 are formed at equal intervals corresponding to the corresponding narrow slits 45 a and the support hooks 44.

The combined guide and support hook 43 is stamped and extruded from the inner band portion 41b and extends substantially perpendicular to the outer surface of the band material and engages with the slit 45a. . Then, the combined guide and support hook 43 guides the inner band portion 41b and the outer band portion 41a toward each other during the initial contraction of the ear 42 when the clamp band 41 is tightened. Further, the combination hook 43 for supporting also performs a supporting function until a supporting function by a supporting hook 44 described later is generated, and thereafter supports the supporting function. This is because the combined guide and support hook 43 continues to absorb the force directed in the longitudinal direction without bending. Further, the possibility of buckling at the portion of band material within the hook 43 is effectively eliminated by the resistance provided by the substantial amount of band material present on one side of the hook 43.

The support hook 44 is formed by cold deformation and is fitted in the hole 45b. This support hook 44 has a force engagement projecting outwardly from the plane of the clamp band 41 and adapted to engage with a laterally extending end wall 45 'of a respective hole 45b of the outer band portion 41a. A surface 44 'is provided, wherein the support hook 44 is formed integrally with the inner band portion 41b over at least a large part of the periphery other than the force engaging surface 44', so that the projecting force engaging surface 44 'is formed. It has a strength substantially greater than that of the guide hook 43 in the circumferential direction.

Further, a narrow tongue 46 extending outward is formed at an end of the inner band portion 41b. Further, the outer band portion 41b is formed with a step 47 projecting outward with a width corresponding to the width of the tongue piece 46 at an intermediate position thereof, and the step 47 has a tongue piece receiving groove 48. Has formed. The tip of the tongue-shaped piece 46 projects into a part of the tongue-shaped piece receiving groove 48. Since the groove 48 is set to have a length that allows the tongue 46 to be completely stored when the ear 42 is contracted, the tongue 46 is completely received in the groove 48 when tightened. Thereby, the clamp 4 can strongly tighten and fix the water supply pipe 2 to the joint 3 by contracting the ear 42 with a tightening device such as a crimping pliers.

The water supply pipe 1 can be constructed as a single system using the water supply pipe 2, the joint 3, and the clamp 4 as one system, so that piping work can be performed without any welding or gluing work on site. That is, first, the water supply pipe 2 wound in a roll shape is cut into a required length. Next, the cut end of the water supply pipe 2 is widened with a pipe expander, and the clamp 4 is fitted over the water supply pipe 2. Then, the water supply pipe 2 is inserted into the connection pipe portion 3b of the joint 3 and externally fitted. Next, the clamp 4 externally fitted to the water supply pipe 2 is moved onto the connection pipe part 3b, the mouth of the pressure pliers is opened, and the clamp is hooked on the ear 42 of the clamp ring 41. Then, the mouth of the crimping pliers is slowly closed to the end, and the ear 42 is contracted and crushed. Thereby, the clamp 4 can firmly tighten the water supply pipe 2 to the connection pipe 3b of the joint 3.

It has been confirmed that this water supply pipe structure conforms to the standard of JIS K 6787 “crosslinked polyethylene pipe for water supply”. That is, in the tensile test, when the standard value of the tensile yield strength was “16.0 MPa or more”, the test result was “22.6 MPa”. In the pressure resistance test (25.5 kgf / cm ^{2 for} 2 minutes), when the standard value was “no leakage or other defects”, the test results were as follows: Appearance, 10A, 13A, 16A, 20A, 25A "No abnormality". In the internal creep test under hot internal pressure (19 to 21 degrees 1 hour and 94 to 96 degrees 1000 hours), the specification values are "no leakage or other defects". "No abnormality". Regarding the reduction of residual chlorine in the leachability test, when the standard value was “0.7 mg / L or less”, the test result was “0.6 mg / L”. Regarding the presence / absence of water bubbles in the chlorine water resistance test, the test result was “no water bubbles generated” as well as the standard value. In the gel fraction test, when the standard value was "65% or more", the test result was "79%".

In the above embodiment, the joint is made of brass, but a joint made of cross-linked polyethylene or another known material may be used. Further, in the above embodiment, an example in which a three-layer crosslinked polyethylene pipe was used as the water supply pipe was described, but a single-layer or two- or more-layer crosslinked polyethylene pipe may be used. Included in the range. In other words, it goes without saying that various design changes can be made without departing from the gist of the present invention.

[0018]

[Effect of the invention]

 Since the present invention has the above configuration, the following specific effects can be obtained. (1) It is completed by combining the three parts of the water supply pipe, the joint and the clamp, so that the piping work can be performed quickly. 2. No complicated welding, soldering or gluing work is required for piping work, and it can be handled easily even by non-experts. (3) Due to the small number of parts and the simplicity of the work, a significant cost reduction can be achieved compared to the conventional structure.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of the piping structure of the present invention.

FIG. 2 is an explanatory diagram showing a three-layer structure of a water supply pipe.

FIG. 3 is a front view of the clamp.

FIG. 4 is a perspective view of a clamp.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water supply pipe 2 Water supply pipe 3 Joint 4 Clamp 21 Inner pipe 22 Middle pipe 23 Outer pipe 31 Joint main body 32 Connection pipe part 41 Clamp ring 42 Ear 43 Guide hook 44 Support hook 45 Hole 46 Tongue piece 47 Step part 48 Tongue piece Receiving groove

Claims (4)

[Utility model registration claims] 1. A water supply pipe structure comprising a plurality of water supply pipes, a joint for connecting the water supply pipes, and a clamp for fixing the water supply pipes to the joints, wherein the water supply pipe has a single-layer structure or a plurality of water supply pipes. The joint is a plug-in joint having a connecting pipe portion extending outward from the joint body and inserted into the water supply pipe, and the clamp is crimped to the clamp band. And a support hook and a guide hook are provided so that they can be engaged with the respective holes and tightened, and the clamp can be externally fitted to a water supply pipe externally fitted to the connection pipe portion of the joint. A water supply pipe structure characterized by tightening the connection pipe section. 2. The water supply pipe according to claim 1, wherein the water supply pipe has a three-layer structure of an inner pipe made of cross-linked polyethylene, a middle pipe made of an aluminum plate, and an outer pipe made of polyethylene or cross-linked polyethylene. Water supply piping structure as described. 3. A water supply pipe comprising: an inner pipe formed into a tubular shape by heating a pipe and spraying powder crosslinked polyethylene; a middle pipe in which an aluminum plate is adhered on the inner pipe; The water supply pipe structure according to claim 2, wherein the water supply pipe structure has a three-layer structure of an outer pipe formed by spraying powdered polyethylene or powdered crosslinked polyethylene onto the outer pipe. 4. The clamp comprises a single clamp band comprising an outer band portion and an inner band portion, and one crimping ear having a substantially U-shaped cross section is formed at a middle position of the outer band portion. A combination guide and support hook and a plurality of support hooks extending outward are formed in the inner band portion, and a narrow slit corresponding to the combination guide and support hook is formed in the open end of the outer band portion. And a hole corresponding to the support hook are formed, and a narrow tongue-like piece extending outward is formed at an end of the inner band portion, and an intermediate position is formed in the outer band portion. To form a step which protrudes outward with a width corresponding to the width of the tongue, wherein the step is capable of completely storing the tongue when the ear is pressed and contracted. 3. A receiving groove having a receiving groove. Water supply piping structure described in 1.