JP2003119844A - Method of forming water discharge pipe and water discharge pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of forming a water discharge pipe of a double pipe structure with such a large curve as prevents insertion of an inner pipe, and a water discharge pipe. SOLUTION: A straight-shaped small diameter pipe 31 longer than a straight- shaped large diameter pipe 30 is inserted through the large diameter pipe 30, and with both end faces m and n of the small diameter pipe 31 protruding from both end faces m' and n' of the large diameter pipe 30, the shell 30a of the large diameter pipe 30 and the shell 31a of the small diameter pipe 31 are bent at the same time to obtain the water discharge pipe 9 with the double pipe structure.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a water discharge pipe forming method and a water discharge pipe.

[0002]

2. Description of the Related Art In a water discharge pipe having a double pipe structure in which a resin pipe (inner pipe) is inserted into a metal pipe (outer pipe) that has been bent in advance, of course. However, the metal pipe is bent only to the extent that a resin pipe can be inserted, and it is difficult to obtain a water discharge pipe having a double pipe structure with a larger bend.

The present invention has been made in consideration of such circumstances, and provides a method for forming a water discharge pipe having a double pipe structure having a large bend so that the inner pipe cannot be inserted, and a water discharge pipe. It is an object.

[0004]

In order to achieve the above object, a method of forming a discharge pipe according to the present invention is designed so that a straight large-diameter pipe is inserted into a straight small-diameter pipe. The body of the large-diameter pipe and the body of the small-diameter pipe are bent at the same time with both end surfaces protruding from the both end surfaces of the large-diameter pipe to obtain a water discharge pipe having a double-pipe structure.

Further, from another aspect of the present invention, there is provided a water discharge pipe formed by the above-mentioned forming method, wherein the water discharge passage communicating with the mixed hot water or the water discharge passage formed in the faucet body is the water discharge pipe. Provided is a water discharge pipe, which is formed by an inner pipe and has an air layer formed between the inner pipe and the outer pipe.

Further, according to another aspect of the present invention, there is provided a water discharge pipe formed by the above-mentioned forming method, wherein a purified water discharge passage communicating with a purified water discharge passage formed in the faucet body is included in the water discharge pipe. There is provided a water discharge pipe characterized in that a raw water discharge pipe is formed between the inner pipe and the outer pipe while being formed by the pipe and communicating with a discharge passage of the mixed hot water or water.

[0007]

1 to 3 show an embodiment of the present invention applied to a hot and cold water mixing faucet for a bathroom, for example.

1 to 3, reference numeral 1 is a faucet body of a hot and cold water mixing faucet 2, and a hot water introducing portion 3 connected to a hot water supply pipe,
It comprises a water introduction part 4 connected to a water supply pipe, and a hot and cold water mixing chamber 5 communicating with the both parts 3, 4. The hot water introducing section 3 has a hot water valve body for controlling the communication state between the outlet passage i in the hot and cold water mixing chamber 5 and the hot water supply pipe passage, and the water introducing portion 4 includes the outlet passage i and the water supply pipe passage. It has a water valve body for controlling the communication state with.

Reference numeral 5a is a rising portion of the hot and cold water mixing chamber 5, which constitutes a mixed hot water or a water outlet.

Reference numeral 6 denotes a hot and cold water mixing faucet mounting surface portion provided at a corner of the bathtub A. Reference numeral 7 denotes a resin-made hot water handle arranged directly above the hot water introducing portion 3 and on the surface 6a of the mounting surface portion 6 for opening and closing the hot water valve body. Reference numeral 8 denotes a resin water handle disposed directly on the water introducing portion 4 and on the surface 6a of the mounting surface portion 6 for opening and closing the water valve body.

The characteristic structure of the present invention will be described below.

Reference numeral 9 is a water discharge pipe rotatably provided around the axis L of the lead-out portion 5a. The water discharge pipe 9 is an inner pipe 10 having a small diameter d for forming a water discharge passage j of the mixed hot water or water supplied from the outlet passage i, and the inner pipe 1.
Outer pipe 1 of large diameter D (> d) covering 0 through the air layer W
1. The double tube structure is provided. The air layer W is formed between the inner surface 11 a of the outer pipe 11 and the outer surface 10 a of the inner pipe 10.

The outer pipe 11 and the inner pipe 10 are
Any material that can be bent by a pipe bending device (not shown) may be used. That is, in this embodiment, the same material is used for the outer pipe 11 and the inner pipe 10, for example, copper is used. However, in the present invention, the outer pipe 11 and the inner pipe 10 are made of materials other than copper. A bendable metal such as stainless steel may be used for the above, a flexible resin that can be bent by a pipe bending apparatus may be used, and the outer pipe 11 and the inner pipe 10 may be different. Materials may be used.

Reference numeral 12 is a cap nut for installing the water discharge pipe 9 on the mounting surface portion 6.

Reference numeral 14 denotes a cap-shaped tip fitting attached to the most downstream end S of the water discharge pipe 9, to which a water discharge port portion 13 having a rectifying action is screwed. This tip fitting 14 has a peripheral surface 1
The entire surface of 4b is brazed to the inner peripheral surface of the tip of the outer pipe 11, and the tip of the inner pipe 10 is opened to the upper surface opening 14a.
It is attached to the tip fitting 14 via. Figure 3
In (C), 15 is a brazing portion on the peripheral surface 14b.

On the other hand, 16 is a substantially cylindrical rear end fitting attached to the most upstream end P of the water discharge pipe 9. A state in which the downstream side of the rear end fitting 16 is connected to the water discharge pipe 9 (see FIG. 3)
By fitting the rear end fitting 16 into the rising portion 5a of the hot and cold water mixing chamber 5 in (D), the discharge passage j formed in the inner pipe 10 and the outlet passage i in the hot and cold water mixing chamber 5 are formed.
The rear end fitting 16 has a communication portion 17 for communicating with the rear end fitting 16. The communication portion 17 includes a communication hole 17a having a center at a position eccentric from the central position and a communication hole 17a.
The cutout portion 17b communicates with a.

The rear end of the inner pipe 10 is attached to the rear end fitting 16 through the communication hole 17a, and the outer peripheral surface of the rear end fitting 16 is the most upstream end P of the outer pipe 11.
It is brazed to the inner surface. 19 is a brazing portion between the outer pipe 11 and the rear end fitting 16. The cutout portion 17b has a function of communicating the discharge passage j and the discharge passage i, and in the state shown in FIG. 3D,
It also has an inner pipe positioning adjustment function of moving the rear end of the inner pipe 10 along the notch 17b so that the inner pipe 10 does not hit the outer pipe 11 and adjusting the position of the inner pipe 10 with respect to the outer pipe 11.

Next, a method of forming the water discharge pipe 9 will be described.

First, as shown in FIG. 3A, two straight (linear) copper pipes 30 and 31 are prepared. One copper pipe 31 is longer and has a smaller diameter d than the other copper pipe 30. The two copper pipes 30 and 31 have predetermined lengths B and C so that the bending process is immediately performed.
Is set to.

Then, the both ends m and n of the copper pipe 31 having a long length (length C) and a small diameter d are replaced by a short length (length B) and a large diameter D.
While inserting the copper pipe 31 into the copper pipe 30 in a protruding state from both end surfaces m ′ and n ′ of the copper pipe 30, the body 30a of the copper pipe 30 is removed by a pipe bending device (not shown). The body 31a of the copper pipe 31 is bent at the same time to obtain a water discharge pipe scheduled member 33 having a large bend and a predetermined curved shape [see FIG. 3 (B)]. In FIG. 3 (A), the copper pipes 30 and 3 by the pipe bending apparatus are shown.
Arrows E, F, G, and H indicate the four points where the pressure is applied to 1. A support member that supports the central portion of the body 30a is installed on the side of the copper pipe 30 opposite to the pressed portion. Each of the four points E, F, G, and H is pressed by, for example, a rotating roller, and a roller that does not rotate is used as the supporting member.

The water discharge pipe scheduled member 33 is formed by inserting a bent copper pipe 31 'into a bent copper pipe 30'. In FIG. 3 (B), the inner torso portion 30a ″ of the bent torso 30a ′ and the inner torso portion 31 of the bent torso 31a ′ are shown.
“A ″” indicates a state in which the region “a” is in contact with the region L of the planned discharge pipe member 33.

Subsequently, the above-mentioned tip fitting 14 is attached to the water discharge pipe scheduled member 33. FIG. 3C shows a state after the attachment.

In FIG. 3C, the bent body 30a '
The outer torso portion 30a ″ of FIG. 3 and the outer torso portion 31a ″ of the bent torso 31a ′ are in contact with each other over the region M at the top portion of the spouting pipe planned member 33.

After that, the above-mentioned rear end fitting 16 is attached to the water discharge pipe scheduled member 33 to obtain the water discharge pipe 9 having a double bend structure (see FIG. 3D).

In the discharge pipe 9 of this embodiment, the discharge pipe j communicating with the mixed hot water or water discharge passage i formed in the faucet body 1 is formed by the inner pipe 10, while the inner pipe 10 and Although the air layer G is formed between the outer pipes 11, the present invention is not limited to this type and is also applicable to a water discharge pipe of the type shown below, for example.

For example, while a purified water discharge passage communicating with the purified water discharge passage formed in the faucet body is formed by an inner pipe, mixed hot water or raw water (mixed hot water or water) discharge passage communicating with the water discharge passage. The present invention can be applied to a water discharge pipe formed between the inner pipe and the outer pipe.

Further, while the discharge pipe communicating with the mixed hot water or the water discharge passage formed in the faucet body is formed by the inner pipe, the water discharge passage or the water supply is provided between the inner pipe and the outer pipe. The water branch that is branched from the water inlet that is connected to the pipe is connected, and the tip between the inner pipe and the outer pipe is blocked so that the branched water cannot be discharged. The present invention is also applicable to a water discharge pipe configured to prevent heat conduction from the hot water to the outer pipe.

[0028]

According to the present invention, there is an effect that it is possible to provide a method for forming a water discharge pipe having a double pipe structure having a large bend so that the inner pipe cannot be inserted and a water discharge pipe.

[Brief description of drawings]

FIG. 1 is a configuration explanatory view showing a usage state of a water discharge pipe in an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a mounted state of the water discharge pipe in the embodiment.

FIG. 3A is a diagram showing a state at an initial stage of forming a water discharge pipe in the above embodiment. (B) is a figure which shows the state at the time of simultaneously bending the cylinder of a large diameter pipe and the cylinder of a small diameter pipe in the said embodiment. (C) is a figure showing a state when a tip fitting is attached in the above-mentioned embodiment. (D) is a diagram showing a state after the water discharge pipe is formed in the embodiment.

[Explanation of symbols]

9 ... Water discharge pipe, 30 ... Straight large-diameter pipe, 30
a ... a large diameter pipe body, 31 ... a long straight straight small diameter pipe, 31a ... a small diameter pipe body, m, n ... both end faces of the small diameter pipe, m ', n' ... both end faces of the large diameter pipe.

Claims (4)

[Claims] 1. A straight large-diameter pipe having a straight small-diameter pipe inserted therein, which is longer than the straight large-diameter pipe, and has both end faces of the small-diameter pipe projecting from both end faces of the large-diameter pipe. A method for forming a water discharge pipe, characterized in that a water discharge pipe having a double pipe structure is obtained by simultaneously bending the body of a small diameter pipe. 2. The method for forming a water discharge pipe according to claim 1, wherein the large diameter pipe and the small diameter pipe are made of a material that can be bent by a pipe bending apparatus. 3. The water discharge pipe formed by the method according to claim 1 or 2, wherein the water discharge passage communicating with the mixed hot water or the water discharge passage formed in the faucet body is the water discharge pipe. A water discharge pipe, characterized in that it is formed by an inner pipe, while an air layer is formed between the inner pipe and the outer pipe. 4. A water discharge pipe formed by the method according to claim 1 or 2, wherein the purified water discharge passage communicating with the purified water discharge passage is formed by an inner pipe of the discharge pipe, while mixing. A water discharge pipe, wherein a raw water discharge passage communicating with hot water or a water discharge passage is formed between the inner pipe and the outer pipe.