JPS6348856Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a pipe joint for small-diameter metal pipes used for refrigerant piping of automobile cooling systems, etc. The excess wall of the union nut of the pipe joint is removed to make the pipe joint small and lightweight. The aim is to

A conventional pipe fitting for small diameter metal pipes using an O-ring is shown in FIG. A central hole 1c communicating with the metal tube 2 is provided. The other metal tube 4 is provided with an outwardly expanding portion 4a, and the distal end side of the expanded portion 4a is fitted into the central hole 1c of the joint body 1, and an O-ring 5 is fitted externally into the distal end. is disposed within an annular groove 1d formed at the tip of the joint body 3. The union nut 3 has an outer diameter hexagonal part 3
a, into which the metal tube 4 is fitted, and a female threaded part 3b which is threadedly engaged with the male threaded part 1b of the joint body 1. Since the hole 3c has a smaller diameter than the female threaded part 3b, there is a step between them. A portion 3d is formed.

In the pipe joint having the above structure, the female threaded portion 3b of the union nut 3 is screwed into the male threaded portion 1b of the joint body 1, so that the enlarged portion of the metal tube 4 is formed between the stepped portion 3d of the union nut 3 and the tip of the joint body 1. The metal tubes 2 and 4 are connected by sandwiching the union nut 4a through an O-ring 5, but since the union nut 3 is made of a hexagonal drawn material that matches the diameter of the female threaded portion 3b, the female thread The hole 3 has a much smaller diameter than the part 3b.
There was excess wall thickness at the outer circumferential portion of c, which made the entire pipe joint large and heavy.

Therefore, this invention was devised to solve the above-mentioned drawbacks, and aims to reduce the size and weight of the union nut.The gist of this invention is to connect one metal pipe 2 and A joint main body 1 having a male threaded portion 1b formed therein, a hole 3c through which the other metal tube 4 is inserted having an enlarged portion 4a formed therein, and a female threaded portion 3b which is screwed into the male threaded portion 1b and has a larger diameter than the hole 3c. The union nut 3 is formed by fitting the tip of a metal tube 4 with an O-ring 5, inserting it into the central hole 1c of the joint body 1, and screwing the male threaded part 1b and the female threaded part 3b. In a pipe joint for a small diameter metal pipe, in which the enlarged part 4a of the metal pipe 4 is sandwiched between the stepped part 3d of the union nut 3 and the distal end of the joint body 1 with an O-ring 5 interposed therebetween, the outer periphery of the female thread part 3b of the union nut 3 The portion is a cylindrical portion 6a having a smaller diameter than the circumscribed circle of the hexagonal portion 1a of the joint body 1, and the outer peripheral portion of the hole 3c is a hexagonal portion 6b in which the length between opposing tops is smaller than the outer diameter of the cylindrical portion 6a. There is a particular thing.

Therefore, the female threaded portion 3b of the union nut 3
The outer circumferential portion of the hole 3c is made into the cylindrical portion 6a, and the outer circumferential portion of the hole 3c is made into the hexagonal portion 6b in which the length between the opposing tops is smaller than the outer diameter of the cylindrical portion 6a, thereby reducing the wall thickness of the outer circumferential portion of the hole 3c. This allows the device to be made smaller and lighter.

Examples of this invention will be described below with reference to the drawings.

In FIG. 2, the joint body 1 has 6 holes on its outer periphery.
A corner portion 1a and a male screw portion 1b having a smaller diameter than the corner portion 1a are formed, and a central hole 1c is formed inside. Further, an annular groove 1d having a diameter larger than the central hole 1c is formed at the tip of the joint body 1, and a metal tube 2 is connected to the rear end.

The union nut 3 includes a female threaded portion 3b that screws into the male threaded portion 1b of the joint body 1, and a female threaded portion 3b.
A hole 3c with a smaller diameter than b is formed, and the outer circumferential portion of the female threaded portion 3b is a cylindrical portion 6a having a minimum thickness necessary for forming the female threaded portion 3b, and the outer circumferential portion of the hole 3c has a hexagonal portion 6b. It is formed. The length between the opposing tops of the hexagonal portion 6b is shorter than the outer diameter of the cylindrical portion 6a. Therefore, the union nut 3 can be formed by cutting the hexagonal part from a round bar whose outer diameter is the cylindrical part 6a, and a material equal to the diameter of the cylindrical part 6a can be used as the material. .

As described above, according to this invention, the cylindrical part of the union nut is made to have the minimum necessary thickness, and the length between the opposing tops of the hexagonal part is shorter than the diameter of the cylindrical part. Since it is configured like this,
By eliminating excess meat, it can be made smaller and lighter.

Moreover, a cylindrical material having the same diameter as the cylindrical portion can be used, and the material can be saved. Furthermore, the small hexagonal part has the advantage that the span of the spanner is small, so that a small spanner can be used. For this reason, in addition to improving workability at the clamping place, the use of a small spanner prevents the generation of excessive torque, which prevents damage to the threads of the male threaded portion 1b and female threaded portion 3b. .

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional pipe joint, and FIG. 2 is a sectional view of the pipe joint of this invention. 1... Joint body, 1b... Male threaded part, 2... Metal tube, 3... Union nut, 3b... Female threaded part, 3c... Hole, 6a... Cylindrical part, 6b... Hexagonal part.

Claims (1)

[Scope of utility model registration request] While connecting one metal pipe 2, the male threaded part 1
The joint body 1 has a joint body 1 formed with an enlarged portion 4a, a hole 3c through which the other metal tube 4 is inserted, and a female threaded portion 3b that is screwed into the male threaded portion 1b and has a larger diameter than the hole 3c. The distal end of the metal tube 4 is fitted with an O-ring 5 and inserted into the central hole 1c of the joint body 1, and the male threaded portion 1 is made of a union nut 3.
For small diameter metal pipes, the enlarged part 4a of the metal pipe 4 is sandwiched between the stepped part 3d of the union nut 3 and the tip of the joint body 1 with an O-ring 5 interposed between the stepped part 3d of the union nut 3 and the tip part of the joint body 1 by screwing together the female thread part 3b. In the pipe joint, the outer circumferential portion of the female threaded portion 3b of the union nut 3 is made into a cylindrical portion 6a having a smaller diameter than the circumscribed circle of the hexagonal portion 1a of the joint body 1, and the outer circumferential portion of the hole 3c is made into a cylindrical portion having a length between the opposing tops as described above. A pipe joint for a small diameter metal pipe, characterized in that the hexagonal part 6b is smaller than the outer diameter of the part 6a.