JP3064033U - Flexible tube for resin tube connection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive, few required parts, and to provide flexibility for forming a curved conduit, connectivity to a resin pipe, sealing properties at a connection portion with a resin pipe, and corrosion resistance. Provided is a flexible pipe for connecting a resin pipe, which can satisfy various properties required for a piping element such as water resistance. SOLUTION: A resin socket 2 is fitted in at least one end of a flexible tube main body 1 in which peaks 15 and valleys 16 are alternately arranged in the longitudinal direction. Inner surface 21 of socket 2
The ring-shaped sealing material 3 fitted in the valley portion 16 is brought into close contact with the outer surface 12 of the flexible tube main body 1. Flexible tube body 1
Is formed by forming a resin coating layer on the outer surface of a steel pipe. At the end of the flexible tube main body 1, a flange portion 17 formed by flatly crushing a mountain portion is provided, and the socket 2 is provided with a stepped portion 22 that engages with the flange portion 17.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a flexible tube for connecting a resin tube.

[0002]

[Prior art]

 When connecting other pipes and pipe accessories (water taps, gas taps, etc.) to conventional polyvinyl chloride pipes or polyethylene pipes used for water supply and sewage or gas pipes through bent pipes In some cases, the bent conduit is formed by a flexible tube. Flexible pipes have also been used mainly for hot water pipes that extend from gas appliances such as hot water heaters installed indoors and have hot water supply ports at their ends.

[0003] As a flexible tube used for forming the above-described curved conduit, there is known a flexible tube described in Japanese Utility Model Publication No. 3011265. In this case, a cylindrical joint is fixed to the end of a flexible steel pipe in which peaks and valleys are alternately arranged in the longitudinal direction, and a resin socket is airtight or sealed to the end of the joint. The steel pipe was connected in a watertight manner, and the outer surface of the steel pipe was covered with a braided braid formed by knitting a metal wire rod into a tubular shape and a tubular cover rubber covering the braid. In this flexible tube, the flexible steel tube serves to form a curved conduit, the socket is used for connection with a resin tube, and the blades help protect the flexible steel tube. The cover rubber serves to block the contact between the flexible steel pipe and moisture to prevent corrosion of the steel pipe.

[0004]

[Problems to be solved by the invention]

 However, the flexible tube described in the above publication has elements such as a joint fitting, a braided blade, and a cover rubber in addition to a flexible steel tube and a resin socket, so that the number of parts is small. It has many and complicated structures, and is equipped with expensive braided blades and the like as components, so that the overall price is high. For this reason, the conventional flexible pipe described in the above-mentioned publication has the advantage that a bent pipe can be formed without using an extra joint such as an elbow or a short pipe. Flexible pipes for connecting resin pipes have not yet become widespread in which costs such as piping accessories and hot water supply pipes for gas appliances are borne by the individual.

[0005] The present invention has been made under the above circumstances, and can be provided at a low cost with a reduced number of necessary parts. In addition, flexibility for forming a bent pipe, connectivity to a resin pipe, and resin It is an object of the present invention to provide a flexible pipe for connecting a resin pipe, which can satisfy various properties required for a pipe element such as sealing properties and corrosion resistance at a connection point with the pipe.

[0006]

[Means for Solving the Problems]

 The flexible pipe for connecting a resin pipe according to the present invention has a resin pipe at least at one end of a flexible pipe main body in which a resin coating layer is formed on an outer surface of a steel pipe and peaks and valleys are alternately arranged in a longitudinal direction. The socket made of resin to which is connected is held in a fitted state, and the ring-shaped sealing material fitted into the valley is in close contact with the inner surface of the socket and the outer surface of the flexible tube main body. That is.

In this flexible tube, the flexible tube main body in which peaks and valleys are alternately arranged in the longitudinal direction has an arbitrary shape within a certain range by utilizing the deformability of the peaks and valleys. It has the flexibility of being able to bend into two. Therefore, the flexible tube main body is useful for forming a curved conduit. In addition, since the flexible pipe main body is formed by forming a resin coating layer on the outer surface of a steel pipe, the strength and durability required for the flexible pipe main body are maintained by the steel pipe. It is useful for preventing corrosion of steel pipes by blocking contact with moisture. In addition, the resin socket helps to connect the resin tube, and the ring-shaped seal material seals the gap between the inner surface of the resin socket and the outer surface of the flexible tube main body. Help. Further, since the sealing material is positioned using the valley originally provided in the flexible tube main body, it is not necessary to provide a groove for holding the sealing material in the flexible tube main body. .

[0008] The flexible tube main body is formed as a flange part whose end protrudes outward, and the socket is provided with a stepped part that engages with the flange part to prevent the socket from being pulled out. Configuration can be adopted. In this case, even if the flange portion is formed by expanding a straight portion having no peak portion or valley portion provided at the end portion of the flexible tube main body, the peak portion or the valley portion has an end portion. The flexible tube body may be formed by expanding an end portion of the flexible tube main body which is continuous up to. Further, the above-mentioned ridge at the end of the flexible tube main body where the ridge and the valley continue to the end is crushed flat, and the crushed portion is expanded outward to form a flange. You may.

In such a flexible tube, an extra part for preventing the socket from being pulled out from the flexible tube main body becomes unnecessary. In addition, if the end of the flexible tube main body is formed as a flange projecting outward, the flange is formed by expanding the end originally provided in the flexible tube main body. There is no danger that the flange will fall off the flexible tube main body and impair the durability of the flexible tube. Further, in the case where the ridge at the end of the flexible tube body where the ridge and the valley are continuous to the end is flattened to form a flange, the flange has a two-layered structure. There is an advantage that the strength is improved and the production of the flange is easy.

[0010]

[Embodiment of the invention]

 FIG. 1 is a partial cross-sectional view of a flexible tube A for connecting a resin tube according to the present invention, which is partially omitted. The flexible tube A has resin sockets 2 and 2 fitted to both ends of the flexible tube main body 1 at one end and the other end thereof. The flexible tube main body 1 has ridges 15 and valleys 16 alternately arranged in the longitudinal direction, and the ridges 15 and valleys 16 are deformed to form an arbitrary shape within a certain range. It is possible to bend.

The inner surfaces 21, 21 of the sockets 2, 2 and the outer surface 12 of the flexible tube main body 1 are fitted into valleys 16, 16 provided at one end and the other end of the flexible tube main body 1. The ring-shaped sealing materials 3 and 3 are in close contact. For this reason, the gap between the inner surfaces 21 and 21 of the sockets 2 and the outer surface 12 of the flexible tube main body 1 is closed by the sealing materials 3 and 3, and the sealing property (watertightness or airtightness) is exhibited at that location. You. An O-ring made of rubber is used for the sealing material 3. In the illustrated flexible tube A, one seal member 3 is used to maintain the sealing property, but this point is that two or three or more valleys 16 of the flexible tube main body 1 are sealed. A plurality of sealing portions may be formed by fitting a sealing material and bringing each of the sealing materials into close contact with the inner surface 21 of the socket 2 and the outer surface 12 of the flexible tube main body 1.

The resin sockets 2 and 2 serve to connect a resin tube (not shown). As a means for connecting the sockets 2 and 2 to the resin pipe, a method of fitting the socket 2 and the resin pipe and bonding the fitting portion with an adhesive to join them airtightly or watertightly, And joining the two parts in a gas-tight or water-tight manner by welding the butted part, heating one of the socket 2 or the resin pipe to make it flexible, and fitting the other to it to make the both air-tight. Alternatively, in addition to the water-tight joining method, a heating wire that generates heat by energization is embedded in the socket 2 in advance, a resin tube is fitted into the socket 2, and then the heating wire generates heat by energization to connect the two. There is a method of joining by heat fusion.

FIG. 2 is a partial sectional view showing an end of the flexible tube main body 1 in an enlarged manner. As shown in the figure, the flexible pipe main body 1 is formed by forming a resin coating layer 5 on the entire outer surface of a steel pipe 4 having excellent corrosion resistance, such as a stainless steel pipe. In such a flexible tube main body 1, the steel pipe 4 helps to maintain the strength and durability required for the flexible tube main body 1. The resin coating layer 5 is formed by a known means such as applying powder coating to the steel pipe 4 in which peaks and valleys are alternately arranged in the longitudinal direction. Examples of the resin for forming the resin coating layer 5 include a polyvinyl chloride resin and a polyethylene resin. When the outer surface of the steel pipe 4 is covered with the resin coating layer 5 as described above, the contact between the steel pipe 4 and moisture is blocked by the resin coating layer 5, so that the flexible pipe A is buried in the soil. Regardless of whether it is used as a piping element, or as a piping element installed outdoors in locations exposed to rain, it is also used as a piping element for indoor water supply areas such as hot water pipes and water supply pipes. Even if the steel pipe gets wet with water, rusting and corrosion can be suppressed.

As shown in FIGS. 1 and 2, the flexible tube main body 1 has a ridge and a valley formed continuously to its end, and each ridge at one end and the other end is flat. The crushed portions are formed as flange portions 17 and 17 protruding outward. On the other hand, the sockets 2, 2 are provided with stepped portions 22, 22, which are engaged with the flange portions 17, 17 to prevent the socket 2, 2 from being pulled out. This eliminates the need for extra parts to prevent the sockets 2 and 2 from being pulled out of the flexible tube main body 1. In addition, the flanges 17 and 17 are originally provided in the flexible tube main body 1. Since the ridges are formed by crushing the ridges, there is no danger that the flanges 17, 17 will fall off the flexible tube main body 1 and impair the durability of the flexible tube A.

FIG. 3 is a partial cross-sectional view showing a flexible tube A for resin tube connection according to a modified example with a part omitted. This flexible tube A is different from that described with reference to FIGS. 1 and 2 in that the socket 2 is held only at one end of the flexible tube main body 1 in a fitted state. The other end of the straight portion 18 is formed straight without forming any peaks or valleys. The straight portion 18 holds the cap nut 6 in a fitted state. The only difference is that a flange portion 19 that protrudes outward is formed at the portion to prevent the cap nut 6 from coming off. Therefore, the same elements as those described in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description will be omitted.

According to the flexible tube A, a resin tube can be connected to one end of the flexible tube main body 1 using the socket 2, and the flexible tube main body 1 can be connected using the cap nut 6. A metal pipe can be connected to the other end.

FIG. 4 illustrates an example of use of the flexible tube A described with reference to FIGS. 1 and 2. In this use example, a socket 2 at one end of a flexible tube A is connected to a resin tube B which is an underground tube by using any of the means described above. The flexible tube main body 1 is bent at a substantially right angle, and the other end is raised above the ground G. Further, another resin tube can be connected to the socket 2 at the other end of the flexible tube A.

Each of the above-mentioned flexible tubes A is not only suitable for use as a rising pipe that has been raised from the ground to the ground as shown in FIG. It is suitable for use as a bent pipe that is constructed along the floor or straddling the beam under the floor, as a buried pipe that is entirely buried underground, and as an outdoor pipe that is entirely constructed outdoors. Is suitable for use as a piping element in indoor water areas such as a water heater installation place and a washroom.

In this embodiment, the ridge at the end of the flexible tube main body 1 in which the ridge and the valley continue to the end is crushed flat and the crushed portion is expanded outward. Although formed as the flange portion 17, the flange portion 17 for retaining the socket is used to expand a straight portion provided at the end of the flexible tube main body 1 and having no peaks or valleys. Even if it is formed, it may be formed by expanding the end of the flexible tube main body 1 in which the peaks and valleys continue to the ends.

[0020]

[Effect of the invention]

 The flexible pipe for connecting a resin pipe according to the present invention includes a flexible pipe main body in which a resin coating layer is formed on an outer surface of a steel pipe, a ring-shaped sealing material that can be formed by a rubber O-ring, and a resin-made pipe. Since it can be composed of three parts, namely, the socket and the required number of parts, the number of necessary parts is reduced, and it can be provided at low cost. In addition, since it satisfies various properties required for piping elements, such as flexibility for forming a bent pipe, connectivity to resin pipes, sealing properties at the connection points with resin pipes, and corrosion resistance, it is buried in soil. It can be used for various purposes such as pipeline piping elements, outdoor piping elements, and even hot water supply pipes such as water heaters installed indoors. Therefore, it is extremely useful as a flexible pipe for connecting resin pipes in which costs such as piping in residential lands, piping accessories, and hot water supply pipes for gas appliances are borne by the individual.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a flexible pipe for connecting a resin pipe according to the present invention, with a part thereof omitted.

FIG. 2 is an enlarged partial cross-sectional view showing an end of a flexible tube main body.

FIG. 3 is a partial cross-sectional view in which a flexible tube for connecting a resin tube according to a modification is partially omitted.

FIG. 4 is an explanatory diagram showing a usage example of a flexible tube.

[Explanation of symbols]

 A Flexible tube for connecting resin tube 1 Flexible tube main body 2 Socket 3 Sealing material 4 Steel pipe 5 Resin coating layer 12 Outer surface of flexible tube main body 15 Peak portion 16 Valley portion 17 Flange 21 Inner surface of socket 22 Stepped portion

Claims (3)

[Utility model registration claims] 1. A resin socket in which a resin pipe is connected to at least one end of a flexible pipe main body in which a resin coating layer is formed on an outer surface of a steel pipe and peaks and valleys are alternately arranged in a longitudinal direction. Are held in a fitted state, and a ring-shaped sealing material fitted into the valley is in close contact with the inner surface of the socket and the outer surface of the flexible tube main body. Flexible tube. 2. The flexible tube main body is formed as a flange with an end protruding outward.
2. The flexible tube for connecting a resin tube according to claim 1, further comprising a stepped portion which is engaged with the flange portion to prevent the socket from being pulled out. 3. The flexible tube main body has a ridge formed by flattening the ridge at the end and expanding the crushed portion outward to form a flange. The flange is formed on the socket. 2. The flexible pipe for connecting a resin pipe according to claim 1, further comprising a stepped portion which is engaged with the flexible pipe to prevent the socket from being pulled out.