JP2006077850A - Resin-metal composite pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite pipe joint for achieving easy manufacture and low cost, not obtained by using independent metal. <P>SOLUTION: The resin-metal composite pipe joint comprises a metal core member 10 which has a caulked portion and a lock portion 12 coated with a resin selected from POM, PPS, PPG, PP and PE. Thus, its easy manufacture and low cost are achieved. Resin-metal composition increases the strength to endure caulking work. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a composite pipe joint of resin and metal having a novel structure.

  When connecting hoses and pipes or connecting to equipment, metal pipe joints are used, and they are crimped with fasteners such as bands and outer cylinders so as not to be detached. . At the same time, an annular irregularity is formed on the surface of the core member of the joint in order to prevent it from coming off, and this has a structure that bites this into the hose or pipe.

  The material of the core member that is the main body of the pipe joint is made of iron, aluminum, copper, brass, stainless steel, etc., and is manufactured by cutting, rolling, forging, casting, etc. There is a limit.

  FIG. 1 is a partial sectional view of a core member 10, and 11 is an inner cylinder formed for inserting a hose. An annular concavo-convex portion 11a is formed on the outer surface of the inner cylinder 11, and there is not much resistance particularly when the plug is inserted. Thereafter, the annular concavo-convex portion 11a is generally used to prevent the detachment. is there.

  Further, a locking portion 12 is formed on the outer surface of the core member 10 for screwing the core member 10 into a device or for supporting the connection. Such a locking portion 12 usually has a regular hexagonal shape, and is supported by fitting a spanner thereto.

  The core member 10 is made of metal and is manufactured by cutting, rolling, forging, casting, or the like. In particular, the work for forming the annular uneven portion 11a requires a cutting work. And if the front-end | tip of the cyclic | annular uneven | corrugated | grooved part 11a remains unprocessed, an operator's finger | toe etc. may be damaged or the surface of the hose inserted may be damaged. For this reason, it is necessary to round the top of the annular uneven portion 11a.

  On the other hand, a large twist (distortion) is given to the latching portion 12 with a spanner, and the size of the latching portion 12 is different depending on the size of the core member 10, and is accordingly different. A spanner is required.

  The present invention improves the drawbacks of the above-described metal pipe joints, and provides a novel pipe joint that does not exist in metal alone, such as ease of manufacture and low cost.

  The composite pipe joint of resin and metal of the present invention is a composite pipe joint of resin and metal characterized in that the surface of a metal core member in the pipe joint is coated with resin.

  The resin material to be coated is a composite pipe joint of resin and metal selected from POM, PPS, PPG, PP, PE and the like. The resin to be used can be injection-molded, and a resin having high strength is preferably used.

  In particular, it is a metal core member having a rotatable cap nut for connection with other equipment, and prevents the core member from rotating when connected or released. The present invention relates to a composite pipe joint in which a resin locking portion is formed by insert molding on the outer peripheral portion of a member.

  The present invention takes the above-described configuration, and the obtained pipe joint has achieved ease of manufacture and low cost. By combining resin and metal, the strength is increased and caulking is performed. It is to provide a resin fitting that can withstand.

  The composite pipe joint of resin and metal of the present invention is obtained by coating the surface of a metal core member in a pipe joint with resin, and the resin material used is selected from POM, PPS, PPG, PP, and PE. It is a thing.

  The core member made entirely of resin has the disadvantage that the mechanical strength is lower than that of a metal member, and the crimped portion is cracked or cracked when an excessive force is applied to the connecting portion. This invention is made | formed in view of this point, and solves said problem by comprising the specific location of a core member with resin, and compounding.

  The part that is particularly necessary as the specific part is a caulking part of the core member, and a locking part of the core member. In addition, it is the inner surface of the core member.

  When further mentioning the case where the locking portion of the core member is made of resin, the structure of the locking portion is arbitrary, and the outer shape is usually a hexagonal shape that fits the spanner or a combination of parallel sides and circles. It is. When the locking portion is hexagonal, for example, the base material is obtained by cutting out from the opposite side of the hexagon having a dimension of 36 mm. In the present invention, it is obtained by cutting out from a 20φ round bar. Resin injection molding is applied as a stop, and it is possible to save a large amount of material and shorten the cutting time.

  The metal constituting the core member may be iron, stainless steel, copper, or brass, but iron is most preferable in view of strength and cost. And the thickness of this metal shall be 1 mm or more in consideration of strength.

  In general, the metal part constituting the core member and the resin are integrated by the injection molding method by injection as described above, and the metal core member is set at a predetermined position in the mold. The resin is injected into the specific portion described above.

Hereinafter, the present invention will be described in more detail with reference to examples.
FIG. 2 is an enlarged partial cross-sectional view of the core member 10 in which an annular concavo-convex portion 11 a is formed of the resin A on the inner cylinder 11 of the core member 10. Resin A is a POM resin. The core member 10 is set in the mold 20 shown in FIG. 3, and the mold 20 is provided with a groove 20 a for forming an annular concavo-convex portion 11 a. Molded.

  By doing in this way, compared with the conventional metal core member, it became possible to configure without requiring the work of forming the annular concavo-convex portion 11a, which is a great merit in terms of cost. It was. In this example, an inner layer B made of POM resin is simultaneously formed on the inner surface of the inner cylinder 11.

  FIG. 4 shows a structure in which the locking portion 12 formed on the core member 10 is made of resin C. The configuration is the same as that of the previous example, and, for example, POM resin is injection-molded in a cavity for forming the locking portion 12. The thickness of the resin C is 1.5 mm or more in this example.

  In the illustrated example, the metal core member 10 is provided with a rotatable cap nut 15 for connection to another device, and the resin C rotates the core member when connected or released. It is for preventing. Then, the hose 30 is inserted into the inner cylinder 11, and the outer collar 16 is crimped and connected to the hose 30. In addition, it has been confirmed by experiments that the rotation locking torque in the locking portion 12 (resin C) is about 1/4 or less of the torque in the cap nut 15, and there is no problem in strength.

  The locking portion 12 in this example has a different shape depending on its size in the case of a normal metal core member. Therefore, it is not necessary to prepare each spanner according to its size. However, in the case of the present invention, the locking portion 12 can be basically composed of the same size. For this reason, the number of spanners is basically very small.

  In addition, the resin A, B, C and the metal core member 10 should be fixed with an arbitrary adhesive, or a convex portion 10a or a concave portion is formed on the core member 10 side, It is better to form a wedge between the two to prevent slipping between them.

  The present invention is as described above, and is a composite pipe joint in which a predetermined surface of a metal core member in a pipe joint is coated with a resin, and can be used not only for joints of hoses and pipes but also for all kinds of joints. Yes, its industrial value is extremely high.

FIG. 1 is a partial sectional view of a conventional core member. FIG. 2 is a partial sectional view of the core member of the present invention. FIG. 3 is a partial sectional view including a mold for injecting resin. FIG. 4 is a partial sectional view of a core member according to another example of the present invention.

Explanation of symbols

10. Core member,
11 ... Inner cylinder,
11a ... An annular uneven part,
12 ... Locking part,
15 ... Cap nut,
16. Outer color,
20 ... type,
20a ... groove,
21 Cavity,
30. Hose,
A, B, C ... Resin.

Claims (5)

  A composite pipe joint of resin and metal, wherein a surface of a metal core member in a pipe joint is coated with a resin.   The composite pipe joint of resin and metal according to claim 1, wherein the resin material is selected from POM, PPS, PPG, PP, and PE.   The composite pipe joint of resin and metal according to claim 1 or 2, wherein the covering portion is a caulking portion of a metal core member.   The composite pipe joint of resin and metal according to claim 1 or 2, wherein the covering portion is a locking portion of a metal core member.   A metal core member having a rotatable nut for connection with other equipment, and is inserted into the outer periphery of the core member to prevent the core member from rotating when connected or released. A composite pipe joint in which a resin-made locking portion is formed by molding.

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