JP2000266248A - Connection device for piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting device for piping certainly positioning a large diameter pipe and a small diameter pipe, and allowing a brazing filler metal to certainly spread into a clearance between the large diameter pipe and the small diameter pipe to reduce the occurrence of a brazing failure. SOLUTION: A connecting device for a piping is composed of a large diameter pipe 5 and a small diameter pipe 1 inserted in the large diameter pipe 5 with keeping a small clearance, and brazed by pouring a molten brazing filler metal 6 into the clearance from an end portion 7 of the large diameter pipe 5. In the connecting device, a plurality of projecting elements 2 having the same length L from an insertion end portion 3 are formed on an outer peripheral surface of the small diameter pipe 1, and the end portion 7 of the large diameter pipe 5 is abutted on the projecting element 2 to position and then brazed thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connecting device, and more particularly, to a large-diameter pipe and a small-diameter pipe fitted with a slight gap between the inner and outer diameters of the pipes. In the gap between
The present invention relates to a positioning structure when a molten brazing material is poured from the end of the large-diameter pipe and brazed.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional pipe connecting device is provided with an annular projection 11 on the outer periphery of a small diameter pipe 1 and abutting the end 7 of a large diameter pipe 5 on the annular projection 11. The brazing material 6 is positioned at a gap between the large-diameter tube 5 and the small-diameter tube 1 from a contact portion between the annular projection 11 and the end 7 of the large-diameter tube 5.
And brazing.

[0003]

However, in the above configuration, the contact portion between the annular projection and the end of the large-diameter tube is in close contact with the metal touch, so that the brazing material does not easily penetrate, and the large-diameter tube is difficult to penetrate. There is a problem that the brazing material does not completely turn into the gap between the tube and the small-diameter tube, and brazing failure easily occurs. In the present invention, in view of the above problems, the positioning between the large-diameter pipe and the small-diameter pipe can be reliably performed, and the penetration of the brazing material into the gap between the large-diameter pipe and the small-diameter pipe is reliably performed. An object of the present invention is to provide a pipe connection device in which brazing failure is unlikely to occur.

[0004]

In order to solve the above-mentioned problems, the present invention comprises a large-diameter pipe and a small-diameter pipe inserted into the same large-diameter pipe with a small gap. In a pipe connection device in which a molten brazing material is poured into the gap from the end of the pipe and brazed, a plurality of projections having the same distance from the insertion end are formed on the outer periphery of the small-diameter pipe, and the projection is formed. After the end of the large-diameter pipe is brought into contact with and positioned, it is brazed.

[0005] Further, the projections are formed by forming welding.

Further, the projection is formed at two places.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the embodiments of the present invention shown in FIGS.
1 is a capillary tube which is a small-diameter tube having an outer diameter D1 forming a refrigeration cycle, and 2 is the capillary tube 1
Two projections 4 formed by welding and the like at the position of a predetermined dimension L from the insertion end 3 on the outer periphery of the tube 4 are formed at one end so as to form a large-diameter tube 5 having an inside diameter D2 into which the capillary tube 1 is inserted. And 6 is a brazing filler metal that has penetrated from the end 7 of the large diameter pipe 5 into a gap formed between the outer diameter D1 and the inner diameter D2.

Next, the operation and effect of the above configuration will be described. First, the capillary tube 1 is inserted into the large-diameter tube 5 of the dryer 4, and the protrusion 2 abuts on the end 7 of the large-diameter tube 5, so that the insertion margin is reliably set to the dimension L. Can be. The protrusion 2 is located on the outer periphery 2.
By being provided opposite to the location, it can be easily fixed vertically only by suppressing the inclination in one plane. In addition, the protrusion 2 is connected to the capillary tube 1.
, The plurality of projections 2 separated from each other in the welding line can be easily formed. Next, the outer diameter D1 and the inner diameter D2
And the protrusion 2 at the end 7
Since the molten brazing material 6 can be directly penetrated from a portion where there is no brazing, the brazing material 6 surely penetrates into the gap, there is no poor welding, and good brazing is performed so that gas leak of refrigerant vapor does not occur. Can be.

In the above example, the projections 2 are provided at two places.
If provided, the inclination can be regulated in all directions by the protrusions 2, so that it is not necessary to pay much attention to the inclination, and a piping connection device that is structurally more stable can be provided. Can be.

[0010]

As described above, according to the present invention,
A pipe connection device that ensures reliable positioning of the large-diameter tube and the small-diameter tube, and ensures that the brazing material penetrates into the gap between the large-diameter tube and the small-diameter tube, and that brazing failure is unlikely to occur. Become.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment of a pipe connection device according to the present invention.

FIG. 2 is an exploded perspective view of one embodiment of a pipe connection device according to the present invention.

FIG. 3 is a cross-sectional view of a conventional pipe connection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Capillary tube (small diameter tube) 2 Projection 3 Insertion end 5 Large diameter tube 6 Brazing material 7 End

Claims (3)

[Claims] 1. A large-diameter pipe and a small-diameter pipe inserted into the same large-diameter pipe with a small gap, and a molten brazing material is poured from the end of the large-diameter pipe into the gap. In the piping connection device that is formed, a plurality of protrusions having the same distance from the insertion end are formed on the outer periphery of the small-diameter pipe, and after positioning the end of the large-diameter pipe in contact with the protrusion, A pipe connection device characterized by being brazed. 2. The pipe connection device according to claim 1, wherein the projection is formed by welding. 3. The pipe connection device according to claim 1, wherein the projection is formed at two places.