JP2009222172A - Water supply pipe and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve durability, to reduce cost of a pipe material, and to simplify a manufacturing method. <P>SOLUTION: This water supply pipe 10 is characterized by forming a copper pipe 12 in pressure contact on the inner surface side of a steel pipe 11 or a resin pipe. This manufacturing method of the water supply pipe 10 is also characterized by including a process of loosely inserting the copper pipe 12 having an outer diameter smaller than an inner diameter of the steel pipe 11 or the rein pipe into the steel pipe 11 or the resin pipe, and a process of bringing the copper pipe 12 into pressure contact with an inner surface of the steel pipe 11 or the resin pipe by expanding a diameter, by bringing a pressure contact part 13 into pressure contact with an inner surface of the copper pipe 12, by inserting a tool 14 having the pressure contact part 13 having an outer diameter larger than an inner diameter of the copper pipe 12 into the copper pipe 12 loosely inserted into the steel pipe 11 or the resin pipe. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a water supply pipe used around sanitary ware and a method for manufacturing the same.

  Conventionally, brass pipes are generally used for water supply pipes around sanitary appliances such as basins and toilets, but brass pipes have a problem that their inner surfaces are easily corroded and it is difficult to improve durability. Therefore, in order to solve this problem, recently, a copper pipe is often used as a water supply pipe around a sanitary appliance (invented based on a publicly known / public prior art, the applicant of the present invention I do not know prior art documents related to).

  However, when using a copper pipe for the water supply pipe in this way, in addition to the copper pipe being more expensive than the brass pipe, in order to maintain a predetermined strength as the water supply pipe with only the copper pipe, a certain thickness, For example, in the case of a water supply pipe having a size of 20 mm, it is necessary to secure a thickness of about 2.0 mm, which has been a factor in increasing the cost of piping material for the water supply pipe.

  The present invention has been made to solve the above-described problems, and provides a water supply pipe capable of improving durability and reducing the cost of piping materials, and simplifying the manufacturing method, and a manufacturing method thereof. It is intended to provide.

  In order to achieve the above-described object, the present invention is a water supply pipe used around a sanitary instrument, and is characterized by being formed by pressing a copper pipe on the inner surface side of a steel pipe or a resin pipe.

  And preferably, chromium plating is given to the outer surface side of the steel pipe or resin pipe.

  Further, the present invention is a method of manufacturing a water supply pipe used around a sanitary instrument, and a step of loosely inserting a copper pipe having an outer diameter smaller than the inner diameter of the steel pipe or the resin pipe into the steel pipe or the resin pipe; By inserting a jig having a pressure contact portion having an outer diameter larger than the inner diameter of the copper tube into the copper tube loosely inserted in the steel tube or the resin tube, and pressing the pressure contact portion on the inner surface of the copper tube And a step of expanding the diameter of the copper pipe and press-contacting to the inner surface of the steel pipe or the resin pipe.

  According to the water supply pipe of the present invention, it is possible to improve the durability and reduce the cost of the piping material.

  Further, according to the method for manufacturing a water supply pipe of the present invention, the manufacturing method can be simplified and the manufacturing cost can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a water supply pipe 10 according to an embodiment of the present invention. This water supply pipe 10 presses a copper pipe 12 on the inner surface side of a steel pipe 11 and further chrome-plats on the outer surface side of the steel pipe 11. And is used mainly in exposed parts around sanitary instruments such as washbasins and toilet bowls.

  For example, in the case of the water supply pipe 10 having a size of 20 mm, the outer diameter of the steel pipe 11 is 20.6 mm, its thickness is 1.9 mm, and the outer diameter of the copper pipe 12 is 16.8 mm. If the thickness is 0.5 mm, predetermined strength and durability can be secured. Therefore, compared with the case where the water supply pipe is formed only by the copper pipe (the thickness of the copper pipe needs to be about 2.0 mm), the thickness of the copper pipe can be greatly reduced, and the durability is improved. The cost of piping materials can be reduced.

  FIGS. 2A to 2C are perspective views showing a method of manufacturing the water supply pipe 10 having such a configuration. When the water supply pipe 10 is manufactured, first, FIG. As shown, the copper pipe 12 having an outer diameter smaller than the inner diameter of the steel pipe 11 (for example, when the inner diameter of the steel pipe 11 is 16.8 mm, the outer diameter of the copper pipe 12 is 16.0 mm and its wall thickness is 0.6 mm. ) In the steel pipe 12.

  Next, as shown in FIG. 2 (b), a pressure-contact portion having an outer diameter (for example, 15.8 mm) larger than the inner diameter (for example, 14.8 mm) of the copper pipe 12 in the copper tube 12 loosely inserted into the steel pipe 11. An iron rod-shaped jig 14 having 13 is inserted. Then, by pulling the small-diameter rod-like portion 15 of the jig 14 in one direction (right direction in FIG. 2B) along the inner surface of the copper tube 12, the press-contact portion 13 is pressed against the inner surface of the copper tube 12, The diameter of the copper pipe 12 is expanded and brought into pressure contact with the inner surface of the steel pipe 11 to produce the water supply pipe 10 as shown in FIG.

  As described above, according to the method for manufacturing the water supply pipe 10, since the copper pipe 12 can be easily pressed against the inner surface of the copper pipe 11 using the jig 14, the method for manufacturing the water supply pipe 10 is simplified. In addition, the manufacturing cost can be reduced.

  In the above-described embodiment, the case where the copper pipe 12 is formed by pressure contact with the inner surface side of the steel pipe 11 has been described, but a resin pipe may be used instead of the steel pipe 11.

It is sectional drawing which shows the water supply pipe which concerns on embodiment of this invention. (A), (b), (c) is a perspective view which shows the manufacturing method of the water supply pipe | tube which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Water supply pipe 11 Steel pipe 12 Copper pipe 13 Press-contact part 14 Jig

Claims (3)

A water supply pipe used around sanitary equipment,
A water supply pipe formed by pressing a copper pipe on the inner surface side of a steel pipe or a resin pipe.   The water supply pipe according to claim 1, wherein chromium plating is applied to an outer surface side of the steel pipe or the resin pipe. A method of manufacturing a water supply pipe used around a sanitary appliance,
Loosely inserting a copper pipe having an outer diameter smaller than the inner diameter of the steel pipe or the resin pipe into the steel pipe or the resin pipe;
By inserting a jig having a pressure contact portion having an outer diameter larger than the inner diameter of the copper tube into the copper tube loosely inserted in the steel tube or the resin tube, and pressing the pressure contact portion on the inner surface of the copper tube Expanding the copper pipe and press-contacting the inner surface of the steel pipe or resin pipe;
The manufacturing method of the water supply pipe | tube characterized by including.

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