JP2004316786A - Female side structure of pipe joint and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a female side structure A of an easily manufacturable pipe joint. <P>SOLUTION: A curled outer flange part 3 and a large diameter short cylindrical part 4 in which a male side structure B on which a seal material S is fitted is inserted are formed integrally with a metal pipe 1 at the end part 2 of the metal pipe 1 by plastic working. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a female structure of a pipe joint and a method of manufacturing the same.
[0002]
[Prior art]
As shown in FIG. 8, a female side structure 25 of a conventional pipe joint has a reinforcing member 28 made of a material different from that of a pipe 26 fixed to an end portion 27 of a copper pipe 26 so as to be externally fitted thereto (conventional example). 1) is publicly known. The constituent members were made of, for example, a pipe 26 made of copper and a reinforcing member 28 made of stainless steel, brass, or the like. The method of manufacturing the female side structure 25 of the pipe joint is a method of crimping (tightly fitting) the reinforcing member 28 to the end 27 of the pipe 26.
[0003]
Further, as another conventional female-side structure of a pipe joint, one having a connection block with a male-side structure at an end of a pipe is known (referred to as Conventional Example 2). The method of manufacturing the female side structure is a method of welding (brazing) a block body to the tip of a pipe. (For example, refer to Patent Document 1.)
[0004]
[Patent Document 1]
JP-A-2002-22074
[Problems to be solved by the invention]
However, since the female structure of the pipe joint of Conventional Example 1 is composed of members of two different materials, it takes time and effort to manufacture and has poor recyclability when discarded. Further, the female side structure of the pipe joint according to Conventional Example 2 is welded (brazed) to the block body to the pipe, so that it takes time to manufacture.
[0006]
Then, an object of the present invention is to provide a female-side structure of a pipe joint which can be easily manufactured, and a method for manufacturing the same. It is another object of the present invention to provide a female-side structure of a pipe joint having good recyclability and a method of manufacturing the same.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a female-side structure of a pipe joint according to the present invention is a male-side structure in which a curled outer flange portion and a sealing material are fitted by plastic working on an end of a metal pipe. And a large-diameter short cylindrical portion into which the metal pipe is inserted.
[0008]
Further, the method of manufacturing the female-side structure of the pipe joint according to the present invention includes the steps of: operating the female mold and the male mold in mutually approaching directions to plastically process the end of the metal pipe; Forming a large-diameter short cylindrical portion for tightly fitting a sealing material at the enlarged-diameter short column portion of the male mold and immediately forming the metal pipe at the curl-forming concave portion of the male mold. This is a method of forming a curled outer flange portion at an end.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings showing the embodiments.
[0010]
1 and 2 show a use state of an embodiment of the present invention, in which a female-side structure A is connected to a male-side structure B to form a pipe joint. It is connected to a gas water heater or an oil water heater (not shown), through which water or hot water flows. Assuming that the atmospheric pressure is 1 atm, the pressure of the water or hot water is, for example, a maximum of about 3 atm.
[0011]
The female-side structure A of the pipe joint according to the present invention includes a curled outer flange portion 3 and a sealing material S (formed by plastic working on an end portion 2 of a metal pipe 1 such as copper, aluminum, or stainless steel (steel). for example, a large径短cylindrical portion 4 O-ring) male tip B ₀ which fitted the are inserted, are integrally molded with the metal pipe 1. That is, the short cylindrical portion 4 having a diameter larger than the outer diameter of the main body of the metal pipe 1 is formed continuously with the tapered portion 4c, and the curled outer flange portion 3 is connected to the outermost end of the short cylindrical portion 4. Is established.
[0012]
As shown in FIGS. 1 to 3, K denotes a connecting member that connects the female-side structure A and the male-side structure B. K has long holes K ₀ , K ₀ in the vertical direction in front view in which the outer flange portion 3 of the female-side structure A is partially fitted. One side large-diameter arc portion E ₁ along the outer surface 4a of the large径短cylindrical portion 4 of the female structure A (left side in FIG. 1) of the long hole K ₀ is formed. Other small-diameter arcuate portion E ₂ along the outer surface B ₁ ─── metal pipe body 1 of the outer surface of the male structure B ─── (right side in FIG. 1) of the long hole K ₀ is formed.
[0013]
Next, the male side structure B will be described. In FIGS. 2 and 4, the outer flange portion 6 is formed in a protruding shape by plastic working at the forefront of the metal pipe 1a. A ring body 8 having a substantially rectangular cross section made by machining or the like is provided on the inside by a small dimension Z to form a concave circumferential groove 7 into which a sealing material S such as an O-ring is fitted. In the illustrated example, a small concave groove for locking is formed on the inner peripheral surface of the ring body 8, and the metal pipe 1 a is fitted in the outer diameter direction with the ring body 8 fitted on the outer peripheral surface of the metal pipe 1 a. The small collar portion is formed by plastic working, and the ring body 8 is fixed.
In the present invention, the configuration of the male-side structure B other than the above is free.
[0014]
A method of connecting the female-side structure A and the male-side structure B will be described.
FIG. 4 shows a state before the female-side structure A and the male-side structure B are connected. The sealing member S is externally fitted to the male-side structure B (the male-side tip B ₀ of the male-side structure B) and inserted into the female-side structure A in the arrow Y direction. Thereafter, as shown in FIGS. 1 and 2, the connecting member K is elastically attached to the female-side structure A and the male-side structure B so as to be externally fitted. That is, the connection member K connects the female structure A and the male structure B so as not to be separated. At this time, the long hole K ₀ of the connecting member K, the outer flange portion 3 of the female structure A is partially fitted.
[0015]
Next, a method of manufacturing the female structure of the pipe joint will be described.
As shown in FIGS. 5 to 7, the method of manufacturing the female-side structure A of the pipe joint is such that the female mold M ₁ (upper mold) and the male mold M ₂ (lower mold) are operated in mutually approaching directions. A female structure A of a pipe joint is formed by plastically processing the end 2 of the metal pipe 1.
[0016]
Specifically, first, as shown in FIG. 5, to grip the metal pipe 1 at female mold M _1. Thereafter, another actuates the approach direction female mold M ₁ and the male mold M _2. Then, as sequentially shown in FIGS. 6 and 7, forming large径短cylindrical portion 4 for fitting tight sealing material at the male mold M ₂ of enlarged diameter Tanhashira portion T immediately with (pipe expanding) ─── that is, in a continuous manner ─── male mold M ₂ of curling recess C, and forms a curled outer flange portion 3 at an end portion 2 of the metal pipe 1 (curling). In the illustrated example, the curl forming concave portion C is formed in a small circular arc-shaped upper opening along the outer periphery of the base of the enlarged diameter short column portion T. Note that "to operate the female mold M ₁ and the male mold M ₂ in the approaching direction to each other" includes the case of operating in the approaching direction of both female mold M ₁ and the male mold M ₂ to one another, defined to refer to a case where one of the actuating in the approaching direction to the other of the female mold M ₁ or male mold M _2.
[0017]
The present invention provides a possible design changes, for example, a lower mold the female mold M _1, may be an upper mold the male mold M _2.
[0018]
【The invention's effect】
The present invention is configured as described above, and has the following effects.
[0019]
Since it is integral (according to claim 1), the number of parts is minimized, and it can be easily manufactured. In particular, the invention does not require brazing and can contribute to cost reduction. Also, since it is made of one kind of material, recyclability is good.
Since no brazing is required (according to claim 2), mass production becomes possible more efficiently than in the past. In addition, a stable product having a low risk of hot and cold water leakage can be easily obtained. Further, the female-side structure A of the pipe joint with good recyclability can be manufactured.
[Brief description of the drawings]
FIG. 1 is a front view showing a use state of an embodiment of the present invention.
FIG. 2 is a sectional front view showing a use state (connection state).
FIG. 3 is a side view showing a connection member.
FIG. 4 is an explanatory sectional front view showing a state before connection.
FIG. 5 is a sectional front view for explaining a manufacturing method.
FIG. 6 is a cross-sectional front view for explaining a manufacturing method.
FIG. 7 is a cross-sectional front view for explaining a manufacturing method.
FIG. 8 is a sectional front view showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Metal pipe 2 End part 3 (curl-shaped) outer flange part 4 Large diameter short cylindrical part A Female side structure B Male side structure B ₀ Male side tip part C Curl forming recess M ₁ Female mold M ₂ Male mold S Sealant T Large diameter short column

Claims (2)

A large-diameter short part into which a curled outer flange part (3) and a male-side structure (B) fitted with a sealing material (S) are inserted by plastic working on the end part (2) of the metal pipe (1). A female-side structure of a pipe joint, wherein a cylindrical portion (4) is formed integrally with the metal pipe (1). The female mold (M ₁ ) and the male mold (M ₂ ) are operated toward each other in a direction approaching each other to plastically process the end (2) of the metal pipe (1), and the female structure (A) of the pipe joint is formed. A large-diameter short cylindrical portion (4) for tightly fitting a sealing material at the enlarged-diameter short column portion (T) of the male mold (M ₂ ), and immediately forming the male mold (M ₂ ). at curling recess (C) of M _2), the female side structure of the pipe joint and forming a curled outer flange portion (3) to the end of the metal pipe (1) (2) Manufacturing method.

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